Metal Mine

Study and Development Direction of a New Low Cost Filling Cementitious Material for Mining with Unclassified Tailings Filling Method

ZHANG Guo-Sheng, YANG Xiao-Bing, GUO Bin, CHEN Yan-Ting, TU Guang-Fu

2020, 49(07): 1-9.

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Unclassified tailings filling mining is one of the important ways to create green mines and realize clean production.Reducing the cost of filling mining and improving the economic，environmental and safety benefits of filling mining are the permanent goals pursued of the study and development of filling mining technology.Firstly，the study and development of low cost cementitious materials for unclassified tailings filling，including mixed cementitious materials using solid waste as cement admixture，high water cementitious materials and new low cost cementitious materials developed by using solid waste in metallurgical industry in recent decades are summarized.Then，the study and key technologies of total solid waste cementitious materials are summarized.On the basis of analyzing the demand of total solid waste cementing material，the study route and main study contents of all solid waste cementing material were put forward.Based on the above discussion results，the study and development directions of new type of filling cementitious material for all solid waste with low cost are emphasized.The results show that:①based on the analysis of the study status of total solid waste cementitious materials，the study and development of total solid waste cementitious materials should be developed from steel slag base to multi-solid waste low-cost green filling cementitious materials，the study on the hydration mechanism of total solid waste cementitious materials and the decision method of the ratio optimization of cementitious materials should be emphasized；②It should be closely combined with the mining method and filling technology of the mines by using unclassified tailings filling method，following the new product development route of technology，product and commercial total solid waste cementitious materials，the breakthrough point should be focused on creating a demonstration mine of total solid waste filling material and low cost filling mining technology and process，new progress would be made in technology study and development and industrial application of new filling cementitious materials with low cost and total solid waste.

Research Progress on Alternative Approaches for Bond Grindability Test

Li Pei, Liu Jianyuan, Yu Tao, Cao Zhao

2020, 49(07): 10-15.

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Bond grindability is used to calculate the specific energy for a comminution process， which assists in design of grinding circuit and selection of equipment. However， Bond grindability test is time-consuming and exhausting， and limited information is acquired from the test. Researchers have been working on development of alternative approaches for Bond grindability test. Observing most ores presented first-order grinding kinetics， Magdalinovic simulated equilibrium state of Bond grindability test by only 2 open-circuit grinding test， decreasing the experimental work significantly. Levin assumed that to any ore type the energy was constant which was consumed in a standard mill per revolution， and its mean value was calculated. By several grinding tests， the required number of revolutions was obtained， as well as the work index. Bond grindability test could be simulated by population balance model whose modeling parameters were derived from several grinding tests.The simulation could save much labor work as the grinding condition varied. Owing to the faster development of rock mechanics， researchers has been trying to correlate grindability/work index with mechanical properties of the ores to predict its grindability in mining site， which is a promising area to explore.

Experimental Study on the Ultra-deep Length Optimization of the Excavation Cutting Holes in the Tunnel of Gongchangling Iron Mine

Yang Renshu, Wang Yu, Gong Guohui, Zhao Yong, Zuo Jinjing, Luo Haohao, Zheng Changda

2020, 49(07): 16-24.

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Cutting is the key to dring speed in tunnel drilling and blasting.In order to study the relationship between the ultra-depth of cutting hole and the utilization rate of hole in the tunneling process of metal mine，the reasonable value range of the ultra-depth of cutting hole and other holes was discussed based on some relevant literature since 1990s and field test results of the ultra-depth cutting hole.The study results show that whether in metal mines or non-metal mines， with the continuous expansion of tunneling engineering quantity，the depth of hole gradually increases，but the ultra-depth of cut hole does not change.According to the statistics of the ultra-deep cutting of some metal mines，95.2% of the metal mines' roadway blasting and excavation under 200 mm. Based on the field test results of cutting hole ultra-deep，under the premise of keeping other parameters unchanged，the ultra-deep length of the cutting hole is used as a single variable，it is concluded that the auxiliary hole and the surrounding hole are 1.8 m and 2.0 m respectively，and the optimal ultra-deep corresponding to cutting hole is 300 mm and 400 mm respectively， which gets the extreme value of hole utilization 97% and 95%， and increased by 5.4% and 10% when compared to the ultra-deep length of 200 mm，the variety of the ultra-deep length of the cutting holes has an important influence on the utilization rate of the holes.Aming at the optimization problem of overdepth length of cutting hole，the concept of overdepth coefficient [η] is introduced，when the depth of the auxiliary hole and the surrounding hole is x， the corresponding hole depth of the cutting hole is y，and there is an optimal cutting hole ultra-deep coefficient [η]，which makes the utilization rate of the blasthole highest.

Study on Cemented Tailing Backfill Dynamic Characteristics and Its Blasting Response Simulation

Wu Zhenkun, Jin Aibing, Chen Shuaijun

2020, 49(07): 25-32.

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Open-stope backfilling mining method is widely used in underground metal mining.The cemented tailing backfill not only bears the static load pressure，but also faces the blasting impact in the second-step mining process.Therefore，it is of great significance to investigate the dynamic characteristics and blasting response of cemented tailing backfill to ensure mining safety.Static and dynamic load tests were carried out through uniaxial compressive strength （UCS） and Split Hopkinson Pressure Bars （SHPB）.And ANSYS/LS-DYNA software was used to simulate the blasting response law of cemented tailing backfill in the second-step mining process.The study results show that:① dynamic compressive strength of consolidated backfill increases with the increase of strain rate，and they are approximately linear，the dynamic compressive strength is about twice of the static compressive strength under high strain conditions；② the thickness of the protective layer of backfill has a significant impact on the vibration speed and effective stress when blasting during second-step mining，the protective layer should be remained enough in the second-step mining progress，otherwise，the vibration speed of backfill and the effective stress of the backfill will be too large；③the initiation mode also has obvious influence on the blasting response of cemented tailing backfilling，as using hole-top initiation，the protective layer thickness should be 1.5 m，which can satisfy the cemented tailing backfill safety demand，however，for hole-bottom initiation， the protective layer thickness should be 1.8 m.The above study results is of certain reference significance to the design of the strength of cemented tailing backfill and the thickness of protective layer and initiation mode in second-step mining process.

Test Study on Optimal Values of Blasting Parameters of Combined Holes under Lateral Load

Xie Liangbo, Li Erbao, Zhang Xiliang, Yang Haitao, Yi Haibao

2020, 49(07): 33-39.

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As shallow resources are gradually exploited into deeper areas，the problem of high ground stress in deep mines becomes more serious.In order to study the unilateral high in-situ stress caused by mining and cutting engineering during deep metal mine recovery，the formulas of explosive crushing circle radius and fissure circle radius extension length in deep infinite rock mass are theoretically analyzed and deduced.The results show that the initial in-situ stress has an inhibitory effect on the explosive cracking gap of explosives，and the inhibitory effect on the expansion of the crack ring radius is more obvious.The model tests of combined hole blasting under different unilateral confining pressures were carried out.The results show that with the increase of unilateral confining pressure， the volume of the combined hole blasting funnel is reduced，the unit consumption of explosives is increased，and the increase of the unilateral confining pressure also suppresses the combined hole blasting.Based on theoretical analysis and model tests，a three-dimensional model of the underground stope in Zambia Chambishi Copper Mine was established with the LSDYNA software.And the optimization study of the combined hole blasting parameters （hole distance，resistance line） under the unidirectional confining pressure of 15 MPa were conducted.The study results show that when the resistance line W=1.8 m and the hole distance a=2.4 m， that is，when W=23.68[?] and a=31.58[?] （[?] is defined as the hole diameter），the volume of the blasting funnel reaches the maximum value，and the maximum energy efficiency of the explosive can be obtained.The above study results have a theoretical guiding role for the optimization of on-site blasting parameters in mines.

Study on the Mining Scheme of Hanging Wall Residual Orebody of the Inclined Orebody of Jingtieshan Iron Mine

Gong Wenbai, Wu Wanjun

2020, 49(07): 40-46.

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When the I# ore body of Jingtieshan Mine extends downward， the dip angle changes from steep to inclined. If the mining and cutting projects are continued according to the mining method of the steeply inclined ore body， the triangle corner ores will be left on the upper or lower part of the ore body， which in turn leads to an increase in ore loss rate. In order to effectively solve the problem of difficult recovery of the ore body in the triangle area due to the dip angle reduction of the ore body， firstly， two types of mining schemes were proposed to arrange the reef drifts along the orebody trend and along the boundary， in which the reef drifts arrangement three different medium-deep hole-edge hole angle layout schemes of 15°，30°， and 45°. Then， the advantages and disadvantages of different mining schemes of four schemes were analyzed qualitatively from four aspects such as the accuracy requirements of the medium-deep hole， the adaptability of the medium-deep hole construction，the ore body condition adaptability and production efficiency qualitatively. Finally， integrate the production efficiency， construction adaptability， ventilation effect， engineering quantity， construction period and cost， etc.， the analytic hierarchy process （AHP） is used to construct the analytic optimization model for the hanging wall residual orebody of the inclined orebody mining scheme. The final evaluation values of the three schemes of sublevel drifts along orebody trend and along the orebody boundary scheme are calculated to be 0.213，0.201，0.198 and 0.388， respectively. The results show that sublevel drifts along the orebody boundary is the best mining program. The practice results show that the selected scheme in Jingtieshan Mine has achieved ideal results with significant economic benefits， and meet the mining demand of the inclined ore body. The above study results can provide useful reference for the mining of residual orebody under the similar mining conditions.

Bolt-TECCO Net Supporting Technique in the Deep Mine Roadway with High Ground Stress in Jinchuan Mining Area

Li Lifeng, Han Liuping, Zhang Xiaohu, Deng Huilin

2020, 49(07): 47-52.

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The obvious characteristics of deep roadway in Jinchuan Mining Area are large in-situ stress and broken rock mass.The original bolting and shotcreting support method in mine roadway has many problems，such as large amount of surrounding rock deformation and long duration， falling off of shotcreting layer and falling of bolt anchoring force，which are difficult to ensure the safety and reliability of roadway.Based on the investigation and theoretical analysis of the deformation characteristics of the roadway in the mining area，the Bolt+TECCO （no shotcrete） support technique is introduced to solve the support problem.In this paper，the mesh supporting technique has two characteristics:①shotcrete is not used in the support process；②the high-strength metal mesh （TECCO net） which is usually used in slope protection engineering is used in combination with the actual situation based on the deformation characteristics of surrounding rock of deep roadway.The study results show that:①TECCO network with high tensile strength can make the support and surrounding rock form a close whole structure gradually after the deformation of surrounding rock， and improve the bearing capacity of surrounding rock；②the deformation rate of surrounding rock is less than 0.1 mm/d after 40 days of bolting and mesh supporting，which shows that this support method can effectively control the deformation of roadway；③bolt +TECCO net support has the feature of low cost and low operation intensity，which can plays a positive role in high efficiency and safety production of the mine.

Classification of Rock Mass in Mine Based on Improved Fuzzy Comprehensive Evaluation Method

Yin Huiyong, Zhao Han, Xu Lin, Zhao Cuiyue, Ma Dengxian, Cong Shunming

2020, 49(07): 53-58.

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Fuzzy comprehensive evaluation is an effective method to evaluate the quality grade of rock mass.The traditional fuzzy comprehensive evaluation method is one-sided for the weight assignment，and mostly uses the principle of maximum membership degree to make decisions，which may result in the loss of data information and the lack of persuasion.In order to solve this problem，the entropy weight method is proposed to determine the weight coefficient，and the maximum membership principle in the traditional method is modified by calculating the effectiveness， so as to establish an improved fuzzy comprehensive evaluation model. Selecting uniaxial saturated compressive strength， integrity coefficient， rock basic quality index (RQD)，structural plane influence coefficient and groundwater influence coefficient as evaluation indexes，the improved fuzzy comprehensive evaluation model is applied to rock mass quality evaluation of No.2 roadway in Jinchang mining area of Yinan Gold Mine.The results show that the surrounding rock is poor as a whole，between grade Ⅳ and grade V.Compared with the results of traditional fuzzy comprehensive evaluation method and BQ classification method，it is found that the improved fuzzy comprehensive evaluation method is more close to the results of BQ method，and solves the disadvantages of traditional fuzzy comprehensive evaluation method and BQ method， and obtains more scientific and reasonable classification results.In view of this result，the supporting measures of shotcreting，laying metal mesh and bolt are put forward to ensure the integrity and stability of surrounding rock.

Study on the Goaf Detection and Goverance of Metal Mines Based on Reverse Modeling Technique

Wang Hu, Hao Shengwang, Zhang Haiqing, Shi Xianfeng, Tian Yilin

2020, 49(07): 59-65.

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The goaf in metal mines is one of the main hazards threatening the safety of mines because of many factors and complex shapes. In order to evaluate the present situation of the goaf rationally and put forward effective control measures， the first task is to accurately describe the three-dimensional shape elements of the goaf. Accurate detection technology of goaf based on 3D laser scanning has been mature， which provides data basis for fine 3D modeling of goaf. Traditional forward modeling technology is cumbersome， inefficient and requires high data quality and personnel technical level. In order to improve the efficiency of goaf 3D modeling and reduce the modeling difficulty， the key points and difficulties of laser point cloud data processing and model reconstruction technology in metal mine goaf are summarized and discussed based on the principle of reverse modeling technology， and a complete workflow for 3D modeling of complex goaf based on reverse engineering technology is proposed. Finally， the proposed method is applied to the analysis of typical goaf problems in metal mines and the design of reinforcement， blasting and other treatment schemes.The study results show that reverse modeling method obtains the 3D entity model based on the surface that reconstructed directly from the point cloud information， and avoids a lot of repetitive line-surface and surface-body operations in forward modeling. Besides that， this high-efficiency and high-precision modeling method could provide technical support for the investigation， assessment， disaster mechanism analysis and treatment scheme optimization of goaf in metal mines，has broad application prospects.

Test Study on Rainfall Infiltration Law and Failure Model of Waste Rare Earth Tailings

Li Chunsheng, Zhong Wen, Luo Jianlin, Xiao Changbo, Song Shuliang, Wang Jun

2020, 49(07): 66-74.

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The abandoned rare earth tailings piles are characterized by an anisotropic， structurally disordered， weakly cemented or non-cemented special geological body. The infiltration and failure modes are significantly different from the general soil slopes in extreme rainfall conditions. It is easy to produce local collapse or landslide hazard. Two sets of indoor abandoned rare earth tailings pile models with or without top platforms were constructed， and the pore water pressure， water content， internal and external drainage speed under the same rainfall conditions of the models are tested. Besides that， numerical simulations were carried out to study the failure mode and rainfall infiltration law. The study results show that:①The model of the abandoned rare earth tailings pile with or without the top platform has different response to pore water pressure， water content and drainage speed. The three values of model B （with top platform） are larger than the ones of model A （without top platform）， and its response is also more sensitive. ②The top platform leads to a large difference in the failure mode of the abandoned rare earth tailings model. The failure mode of the model A is relatively simple and the damage is small， only the slope angle produces shallow sliding damage， while the model B occurs at the foot of the slope. The obvious shallow sliding failure is accompanied by cracks in the upper part of the slope failure area. As the test progresses， the fracture further merges with the shallow damage area of the slope foot， and the slope surface goes down from bottom to top. The collapse is destroyed， and the model B is more prone to slope damage. The numerical simulation results are consistent with the model test results. The above study results can provide reliable reference for similar tests and effective prevention and control of local collapse and landslide of abandoned rare earth tailings.

Experimental Study on Dynamic Characteristics of Waste Tyre Particles and Tailings Mixed Soil

Ling Liang, Pan Jianping, Liu Kang

2020, 49(07): 75-82.

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In order to study the damping effect of waste tire particle-tailed mixed soil，the dynamic strength，dynamic elastic modulus，damping ratio and their influence law of mixed soil were tested by dynamic triaxial test under different tire particle content and different confining pressure.The interaction mechanism between particles of mixed soil was analyzed，and the critical content of tire particles in mixed soil was determined to be 4%~8%.The test results show that under the same confining pressure conditions，the dynamic strength of the mixed soil is less than that of pure tailings，and decreases with the increase of the amount of tire particles； the dynamic elastic modulus of the mixed soil is lower than that of pure tailings， and the decrease is obvious， when the amount of tire particles is between 4% and 8%，the dynamic elastic modulus of the mixed soil is significantly reduced，when the amount of tire particles is greater than 8%，the effect of the amount of tire particles on the elastic modulus of the mixed soil under the same dynamic strain is small.The damping ratio decreases with the increase of the confining pressure，it increases first and then decreases with the increase of the amount of tire particles，when the amount of tire particles is 4%，the damping ratio of the mixed soil increases significantly，when the amount of tire particles increases to 8% and 12%，the damping ratio of mixed soil under the same dynamic strain no longer increases but decreases.Within a certain range of tire particle content， the dynamic elastic modulus of the mixed soil decreases and the damping ratio increases，which is conducive to the advantages of shock absorption and vibration isolation.The above study results can provide a reference for the application of waste tire particles in the earthquake resistance and disaster reduction of the earth.

Beneficiation Tests of a Low-grade High Slime Tin Oxide Ore from Yunnan

Wang Purong, Wang Ju

2020, 49(07): 83-88.

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The tin oxide ore from Yunnan with tin contents of 0.170% and iron contents of 4.66% is extremely sliming， which was considerated an iron-containing， low-grade， high slime and refractory tin ore. In order to develop appropriate dressing process and determine the optimal process conditions， the beneficiation process of the ore was studied based on study of properties of the ore. The results showed that: ① The ore contains 0.170% tin and the fine slime content of -0.019 mm is 12.74%. The main valuable mineral in the tin ore is cassiterite， followed by limonite， and the main gangue mineral is quartz. The tin mainly exists in the form of cassiterite and acid soluble tin， which is difficult to separate. ② Pre-discarding with spiral chute is a suitable pre-discarding method for the ore， and the optimal technological conditions are the +0.212 mm washing fraction ground to -0.074 mm occupying for 56.25%， the cut pocket width for concentrate end of spiral chute of 55 mm， the feeding pulp concentration of spiral chute of 30%， and the feeding pulp speed of spiral chute of 3.0 m3/h. The chute concentrate with yield of 32.65%， tin grade of 0.424% and tin recovery rate of 81.43% was obtained under those conditions. ③ Higher grade tin concentrate could be obtained after cleaning with shaking table， and high grade qualified tin concentrate could be obtained after deironing by high magnetic separation with tin shaking table concentrate. ④ After the combined process flowsheet of pre-discarding with spiral chute， cleaning with shaking table and iron removal by high intensity magnetic separation， the tin concentrate with yield of 0.22%， tin grade of 41.860%， tin recovery rate of 54.17% and tin rich middling with yield of 0.68%， tin grade of 4.950%， tin recovery rate of 19.80% were obtained. The cumulative recovery rate of tin concentrate and tin rich middling was 73.97% and impurity content of products did not exceed the standard， which realized separation of tin ore. Keywords Low-grade tin ore|High slime|Pre-discarding|Cleaning with shaking table|Iron removal by high intensity magnetic separation

Ultra-fine Regrinding Process Application in a Copper-lead-zinc Polymetallic Mine in Russia

Lu Jun

2020, 49(07): 89-93.

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Kizil-Kashiturk copper-lead-zinc polymetallic sulphide ore in Russia disseminated in micro-fine size and the process with the original single ball mill for regrinding the copper-lead bulk roughing concentrate is difficult to meet the requirement of high mineral liberation. Therefore， the regrinding system transform and production practice was carried out based on mineralogy properties analysis and laboratory scale. By series connection of ball mill and ultra-fine mill， that is adding a new ultra-fine mill to regrind the overflow of the hydrocyclone matched with the original ball mill， final regrinding products of P80 size less than 10 μm was obtained， indicated that the liberation of metal minerals in ores is greatly improved， which makes it conducive to sorting. After stable running of the new regrinding process， it has obvious effect on product quality stabilizing. Compared with the previous system， the transfomation brought out the increase of recovery rate with Pb 16.84%， Zn 4.96% and Cu 2.70%. According to the annual processing of one million tons of ore， the increase of metal amounts with Zn 4 960 t/a， Pb 2 910 t/a，and Cu 208 t/a was realized， which could create a newly added profit of 120 million yuan for enterprises based on the calculation product price.

Application of SLon Centrifugal Separators in Recovering Tungsten from Tungsten Slime in Jiangxi Province

Sun Peichun, Chen Luzheng, Xiong Tao, Huang Huichun, Li Hua, Li Zhenfei

2020, 49(07): 94-98.

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Abstract It is an important way to improve the utilization level of tungsten resources through improving the recovery rate of tungsten fine slime. Centrifugal separation is one of the effective methods to treat fine tungsten minerals. The grade of WO3 in tungsten slime from a Jiangxi tungsten ore is 0.62%， and the content of -50 μm is 56.83%， in which the distribution rate of WO3 is 87.59%. In order to realize the effective recovery of tungsten and associated molybdenum and bismuth in the fine tungsten slime， the process of "flotation desulfurization and SLon centrifuge gravity separation" was used to optimize the experimental conditions， and the industrial test was carried out under the optimal conditions. The results showed that the optimum dosage of butyl xanthate was 160 g/t in flotation desulfurization test， and the optimal drum speed and washing water volume of SLon centrifuge were 680 r/min and 1.6 r/min， respectively. Under the conditions of tungsten grade of 0.52%， molybdenum grade of 0.088% and bismuth grade of 0.073%， the industrial test was carried out by the technological process of "flotation desulfurization and SLon centrifuge gravity separation". Finally， tungsten concentrate with WO3 grade of 25.20% and recovery rate of 73.66% was obtained. Meanwhile， sulfur-bearing production with molybdenum grade of 7.43% and bismuth grade of 5.31% were obtained， with corresponding recovery rates of 56.57% and 48.74%，indicated the better indexes. When the technology of "flotation desulfurization and SLon centrifuge gravity separation" was used to treat tungsten slime from a tungsten mine in Jiangxi Province， the annual increase of tungsten， molybdenum and bismuth metal amounts is 11.4 t， 5.89 t and 1.7 t， and the annual output value is about 2 million yuan， bringing about the remarkable economic benefit.

Study on the Foam Properties and Mechanisms of Different Amines Collectors

Zhu Yimin, Yang Xueying, Cheng Zhouyueyang, Gao Zihui, Han Yuexin

2020, 49(07): 99-104.

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In order to study the effect of molecular structure of dodecylamine， tetradecylamine， hexadecylamine and decyl ether amine on the flotation properties of foam， the bubble size in gas-liquid two phase system， and the foamability of the collectors， the amount of ore in unit volume of foam and recovery rate of foam water in gas-liquid-solid three phase system were studied with the aid of high-speed cameras and other testing equipment. The results indicated that: ① In the condition of the temperature of 15 ℃， pH value of 6.0 and the concentration below the critical coalescence concentration， the sauter diameter size of the bubble when the critical coalescence concentration was reached is in the following order: dodecylamine < decyl ether amine < tetradecylamine < hexadecylamine. ② With the increase of reagents dosage， the foam volume of dodecylamine， tetradecylamine and decyl ether amine after the action with quartz increased first and then decreased， while the foam volume of hexadecylamine decreased. ③ The amount of ore in unit volume of foam for dodecylamine almost does not change with the increase of the dosage of reagents. While the amount of ore in unit volume of foam for tetradecylamine， hexadecylamine and decyl ether amine increase first and then decrease， among which the change rate of hexadecylamine is the fastest， obviously higher than that of dodecylamine and tetradecylamine. ④ With the increase of the reagents dosage， recovery rate of foam water after the action with quartz of dodecylamine， tetradecylamine and hexadecylamine increased gradually， while the recovery rate of foam water of decyl ether amine decreased gradually. ⑤ The collision probability Pc increases with the decrease of the sauter diameter. Reducing the bubble diameter is an effective means to increase the flotation recovery rate， but the recovery of foam water increases， which made the gangue entrainment phenomenon serious.

Effect of Agglomeration through Geopolymerization on the Bioleaching of Low-Grade Copper Ore from High Pressure Grinding Roll

Chen Keqiang, Yin Wanzhong, Rao Feng, Ma Yingqiang, Wu Jie, Miu Yan

2020, 49(07): 105-110.

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In order to keep agglomerates stable under acidic conditions and improve leaching efficiency， the bioleaching of low-grade copper ore from high pressure grinding roll after agglomeration through geopolymerization was studied. The effects of geopolymer gel on the oxidation activity of microorganisms and the performances of raw materials， agglomerates and coarse-grained ores in column leaching were investigated. The properties of agglomerates were studied by means of Nuclear Magnetic Resonance （NMR） and Scanning Electron Microscope （SEM）. The results showed that the ore from the high pressure grinding roll were leached after agglomeration， and the leaching rate was 61% after 66 days， while the leaching rate of coarse-grained ores in the same time was only 28%. The geopolymer gel did not weaken the oxidation activity of the microorganisms. The permeability of raw materials was significantly improved after agglomeration， and the agglomerates could remain stable for a long time during column leaching. The formation of geopolymer gel was the reason for the stability of agglomerates under acidic conditions. After the ore particles were agglomerated through geopolymerization， there were still a large number of pores and cracks between the particles， which was beneficial for leaching. The bioleaching of low-grade copper ore from high pressure grinding roll after agglomeration through geopolymerization can make the extraction of low-grade copper ore more efficient， which is expected to be applied in the heap leaching.

The Reformation Practice of Medium Crushing Products Using Dry Discarding Tailing Process in Heshangqiao Concentrator

Cao Bing, Zou Zongbin

2020, 49(07): 111-114.

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The process study and production process reformation of dry pre-discarding tailings of medium crushing production were conducted aiming at the problems of the low grade of feeding， high concentration ratio， high processing cost and long-term overload operation of the tailing thickener in Heshangqiao concentrator. The results showed that: ① After the pre-discarding tailing with magnetic pulley of CTDG1220 type for on site medium crushing production， the tailing containing 10.31% TFe and 0.80% mFe can be discarded with a yield of 12.38%， and the concentrate containing 20.00% TFe and 7.29% mFe can be obtained with a TFe recovery rate of 93.21% and a mFe recovery rate of 98.42%. The grade of the final cocentrate is 1.20 percent point higher in the later operation. ② The load of the fine crushing and subsequent system can be reduced significantly， which is beneficial to the stable operation of the subsequent system. In addition， 0.742 8 million tons waste rock can be sold as sandstone aggregate every year. ③ The annual revenue generated by additional system can reach 37.28 million yuan.

Study on the Flocculation Performance of Organic-inorganic Hybrid Modified Polyacrylamide

Fang Zichuan, Tao Le, Zhao Jinglin, Sun Chunbao, Zou Wenjie

2020, 49(07): 115-121.

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In order to enhance the flocculation performance of polyacrylamide （PAM）， the inorganic cationic colloid groups were grafted onto the PAM molecular chain for organic-inorganic hybrid modification. Hybrid modified aluminum hydroxide polyacrylamide （Al（OH）3-PAM） and magnesium hydroxide polyacrylamide （Mg（OH）2-PAM） were synthesized using in-situ polymerization of aqueous solution. The structure of hybrid modified PAM was analyzed and characterized by infrared spectroscopy. The viscosity average molecular weights of Al（OH）3-PAM and Mg（OH）2-PAM were determined to be 2.7 million and 3.2 million using the ubbelohde viscometer. The flocculation and sedimentation performance of the synthesized flocculant was studied by sedimentation test with the kaolin pure mineral of -0.038 μm. When the flocculant dosage is 70 g/t， the initial settling velocity in the first ten seconds of Al（OH）3-PAM and Mg（OH）2-PAM are 7.713 mm/s and 11.181 mm/s， respectively， while that of 8 million cationic polyacrylamide （CPAM） is only 3.923 mm/s. The flocs after the action of Al（OH）3-PAM and Mg（OH）2-PAM is smaller and denser than that produced by CPAM. The performance of hybrid modified polyacrylamide is significantly better than that of CPAM and aluminum salt-PAM as well as magnesium salt-PAM composite flocculant， and the hybrid modified polyacrylamide Mg（OH）2-PAM with higher molecular weight has better flocculation and sedimentation performance.

Geolgoical Characteristics and Integrated Prospecting Mode in Gema Pb-Zn Mining Area，Tibet

Cai Zhongming, Yang Xiao, Chu Lukai, Yang Ruixi, Yue Guoli

2020, 49(07): 122-129.

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In the great investigation of territorial resources，a large number of copper，lead and zinc polymetallic ore （area） points，such as Lawu copper-zinc polymetallic ore，Youqialang silver-lead ore and Yaguila lead-zinc ore etc..were found and evaluated by Henan Institute of Geological Survey in Nyenchen Tanglha Mountain Area in Tibet.In order to expand the prospecting achievements of the area，the 10-乙1 Pb-Zn-Ag polymetallic anomaly of 1∶500 00 stream sediments survey around Gema Village was verified.The prospecting target area was reduced by soil geochemical and magnetic survey；the location of mineralized bodies was delineated （inferred） by geological route mapping；the hidden orebodies were tracked by IP intermediate gradient measurement method；the orebodies were revealed by exploration trenching engineering；the spatial distribution of polarized body was determined by arranging IP sounding section perpendicular to the mineralization zones；finally，a medium-sized Pb-Zn polymetallic deposit was found in the study area by geological drilling verificaiton.The prospecting mode of finding and evaluating Pb-Zn polymetallic deposit in Gulu-Youkaxiang Pb-Zn-Ag metallogenic belt with adverse natural conditions was summarized.It has certain reference value for the prospecting and exploraiton study in similar areas.

Geological Characteristics and Prospecting Direction of Pb-Zn Deposit of Dagushigou Area in Henan Province

Zhang Kai, Mao Ruifen, Li Chen, Fan Xiaolei

2020, 49(07): 130-137.

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In order to clearly understand the metallogenic conditions of East Taihang Mountains Fe-Cu-Pb-Zn polymetallic ore belt，plenty of works have been conducted，such as 1∶50 000 mineral resources investigation，1∶50 000 stream sediments survey，1∶50 000 high-resolution magnetic survey and 1∶50 000 electric survey.Based on delineating of geophysical-geochemical anomaly areas and some potential areas，1∶10 000 geological grass survey，1∶10 000 geological-geophysical-geochemical comprehensive profile survey and trench engineering are adopted to carry out the mineral reources investigation.Comprehensive study results show that:①Dagushigou Pb-Zn Deposit is a type of carbonatite-hosted low temperature geothermal deposit and a typical stratabound deposit occurred in Middle Cambrian Zhangxia Formation and Upper Cambrian Sanshanzi carbonatite sequence，which is similar with Mississippi valley type （MVT） deposit；② there are two types of ore-bodies，one type appears as veins，lenticulars and cysts in NNE，NWW trending fault zones，the other type appears as stratum，stratiform，irregular and lenticulars in near-horizontal interlaminar bedding fracture zones，brecciation and dolomitization are the main wall-rock alterations；③31 ore veins were found in the study area in total，which contain 3 Cu-Pb-Zn polymetallic mineralized ore bodies and 3 lead-bearing barite veins are valuable，two industrial ore bodies have been preliminarily delineated，the rich ore bodies extend more than 2 000 m with total thickness of 10~12 m and lead grade from 3.9% to 10.26%，the ore bodies prospective resources could reach small to medium scale.Based on the above study results，according to the geological-geophysical-geochemical and ore-bearing characteristics of the study area，three favorable areas for metallogenic are delineated，they are named as Dagushigou，Xiaodonggou and Puquan，which have good metallogenic potential.The above study results further indicated that good prospecting effects can be obtained by the integrated method of geological investigation，geophysical and geochemical sweep， large scal geological survey，geophysical-geochemical integrated profile measurement and trenching reveling.

Geochemical Characteristics and Metallogenic Prediction of Kaihuang Area in Dulan County， Qinghai Province

Jiang Hailun, Luo Xianrong, Gao Wen, Zheng Chaojie, Huang Wenbin, Liu Wen, Ma Zhongxian, Tao Zhihua

2020, 49(07): 138-145.

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The tectonic location of Kaihuang area in Dulan County，Qinghai Province is located in the southern margin of the Tachai Plate，the middle section of the East Kunlun Orogenic Belt，and within the Xuefeng Mountain-Burhan Buda gold，cobalt，andcopper metallogenic belt.In order to achieve prospecting breakthroughs in Kaihuang area，the 1∶50 000 water system sediment measurement work was carried out in the study area.Based on the data of 527 water system sediment samples，the coefficients of variation， enrichment and concentration ratio of elements were used to to compare 9 elements of Au，Ag， As，Sb，Cu，Pb，Zn，W，Mo were analyzed by mathematical statistics，so as to reveal the spatial enrichment rules of each element and their metallogenic potential，and combined with the metallogenic geological conditions for the study area，metallogenic prediction of the area was done.The study results show that Au element has greater metallogenic potential in the study area，and other elements have smaller metallogenic potential；based on the R-type cluster analysis and factor analysis， the element combinations related to Au mineralization i.e. Au-As-Sb-Pb in the study area was determined；by using contrast anomaly method，two prospecting target areas were delineated in the study area，the anomalous fit of Au， As， Sb，and Pb of KH1 target area and KH2 target area is good,and Baijingou gold orebody is found in KH1 target area.Due to the element nesting and metallogenic geological conditions in KH2 target area and KH1 target area are similar to each other，therefore，it is concluded that the prospecting potential of KH2 target area is also good.The above study results can provide reliable reference for the further prospecting work and metallogenic prediction studies in the study area.

Evidence for Partial Content Geochemical Exploration Method of Deep Elemental Gas Migration: a Case Study of Jinshiling Uranium Polymetallic Deposit in Chenzhou City

Liu Youjian, Xie Yanshi, Tan Kaixuan, Han Shili, Wang Peng, Kang Chunhui

2020, 49(07): 146-154.

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Geochemical exploration of the partial contents of the elements based on the geogas theory is widely used in the exploration of deep concealed deposits.The information of the deep ore body is migrated to the surface to form a superposition anomaly，and the geochemical exploration of the partial contents can be used to collect and analyze the anomaly to estimate the occurrence of the deep ore body.Based on the results of drilling，gamma spectroscopy and radon concentration，the geochemical exploration of partial content technique is used to discovery the evidence of deep elemental the geothgas migration，which can provide a theoretical basis for further searching for deeply concealed deposits.Taking Jinshiling uranium polymetallic deposit as the study example，three sampling lines with abnormal radon concentrations in the mining area is selected，and the component extraction and ICP-MS analysis of the 20 elements such as U， Pb， Zn etc. from 147 samples of the shallow soil with depths of 40~60 cm is carried out.Based on the above test results，anomaly characteristics analysis，correlation analysis cluster analysis of U component are conducted，and the comparative analysis and interpretation of U component in the geologic synthesis section，U component in the soil and U content in gamma energy spectrum are done.The results show that:① U component of the 3# and 8# lines in the area is obviously abnormal，the maximum values are 2 194 ng/g and 2 167 ng/g，and the abnormal contrast values are 1.298 and 1.403，the prospect of uranium prospecting in the area is good；②the elements are closely related to U partial content are Nd，Sm and Ta，whose correlation coefficients are 0.465，0.492，0.491 respectively，which are much higher than the critical value （i.e.， 0.217） with 99% confidence，demonstrating that it is closely related to U during the gas migration process；③the U partial content anomaly is mainly related to the deep concealed ore body and fracture fracture zone，and the U partial content curve is highly consistent with the Nd，Sm and Ta component curves，which suggests that the U，Nd， Sm and Ta component abnormal combination can be used as a geochemical tracer for the deep uranium ore body in this area.

Three-dimensional Geological Modeling of Stratum Based on Multi-scale CSRBFs

Pang Qinggang, Che Defu, Jia Qingren

2020, 49(07): 155-160.

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It is an important work in digital mine research to construct the three-dimensional （3D） geological models of strata based on multi-source data of mines，and these models will facilitate the mine resource assessment and production planning process.The processing of discrete sampling of non-uniform point data by interpolation method is the key to accurately construct the strata model.However，the interpolation methods commonly used in geological modeling do not consider the non-uniformity of the data.Based on the multi-scale CSRBFs interpolation method，a 3D stratum modeling process that can employ non-uniform data is proposed. The process is divided into three steps.Firstly，non-uniform geological discrete points are extracted from multi-source data.Then，the multi-scale CSRBFs interpolation is used to construct the stratum surface model，including four steps:①sample points and unit normal vectors acquisition；②construction of hierarchical point sets by octree；③ multi-scale CSRBFs method is used to interpolate layer by layer from coarse to fine on the hierarchical point sets；④visualization of the implicit surface of the stratum.Finally，the proposed fault modeling method is used to construct normal，reverse and cross-fault models on the continuous stratum surface.The stduy results show that the average error obtained by multi-scale CSRBFs interpolation method （Multi-scale CSRBF，MsCSRBF） through ten-fold cross-validation is 0.943 m，which is lower than the error obtained by inverse distance weighted （IDW） and ordinary kriging （OK）.And the MsCSRBF method is also more time-efficient than the IDW and OK interpolation methods.The above stduy results further indicated that multi-scale CSRBF interpolation method proposed in this paper can carry out high-precision and rapid reconstruction of the formation surface model for non-uniform data.

Parameters Inversion of Probability Integral Method Based on Quantum Particle Swarm Optimization Algorithm

Zhu Shangjun, Wang Lei, Wei Tao, Jiang Chuang, Jiang Kegui, Zha Jianfeng, Kong Chuan

2020, 49(07): 161-169.

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In process of parameter inversion of probability integral method predicts that there are problems such as large calculation amount and complicated process in the process of inverting parameters of the model.Existing intelligent optimization algorithms can make up for these deficiencies，but there are some defects such as easy to fall into premature convergence，poor global search effect of particles，and slow convergence speed.Through experiments，it was found that the quantum-behaved particle swarm optimization algorithm （QPSO） can greatly reduce the running time of the algorithm on the basis of ensuring the accuracy is unchanged， and reduce the probability of particles falling into premature convergence，expanding the particles to be globally unique Solution space.The QPSO algorithm is introduced into the solution of the prediction parameters of mining subsidence.The cumulative sum of the absolute value of the difference between measured values and predicted values of the sinking and moving deformation is the minimum cost function，and the probability integral method parameters inversion model based on QPSO algorithm is constructed.The study results show that:①in the simulation test，under the same operating environment，the QPSO algorithm and the particle swarm optimization algorithm （PSO） have the same precision，and the QPSO algorithm has a slightly higher stability，and the efficiency of the parameter is greatly improved （the running time of the QPSO algorithm is reduced by nearly 90% compared to the PSO algorithm），which verifies the validity and reliability of the parameter inversion model based on the QPSO algorithm；②the probability integral method parameters of of Guqiao South Mine 1414（1） working face are calculated based on the QPSO parameter inversion model，the results show that q=1.041 5，tan[β]=1.910 8，b=0.374 2，[θ]=85.086 9，[S1]=55.663 5 m，[S2]=37.161 8 m，[S3]=-0.667 0 m，[S4]=-9.798 0 m，the error in the fitting of sinking and horizontal movement is 72.04 mm，which meets the engineering application standards，although the precision of QPSO algorithm is similar to that of PSO algorithm，its operational efficiency is significantly improved.The model established in this paper has certain reference value for the accurate inversion of mining subsidence prediction parameters.

Development and Application of New Type High-voltage Pulse Breakage Equipment Based on Marx Generator

Qin Yonghong, Zhang Ningyu, Gao Peng, Li Hongda, Chen Hongyun

2020, 49(07): 170-177.

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A new type of breakage equipment based on Marx generator was developed in view of the defects of the traditional breakage equipment such as insufficient dissociation and uneven product size distribution. In order to realize high efficiency mineral liberation, preliminary enrichment and pre-weakening, the typical Anshan magnetite quartzite was studied using the new equipment. The equipment is composed of a primary charging power supply, a Marx generator, a gas switch and a new type of needle-plate electrode equivalent. The high-voltage pulse discharge breakage experiment indicated that the optimum parameters of ball gap spacing 25 mm and input voltage 70 V, respectively. The increase in the pulse number was conducive to enhancing the breakage effect. Compared with mechanical crushing, the TFe content in the fine particle size of electrical pulse crushing products was significantly increased. With the pulses number of 300, the content of TFe in -0.074 mm particle crushing product increased by 9.14%. The high-voltage pulse breakage was helpful to the preconcentration of iron in fine particle and the effective liberation of magnetite-quartz intergrowth.

Development and Application of a New Type of X-ray Fluorescence Online Grade Analyzer Based on STM32

Liu Zhiyuan, Cheng Xiaozhou

2020, 49(07): 178-186.

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Pulp grade measurement has always been the research focus and technical difficulties in mineral processing industry， the accurate measurement of pulp grade with online feedback directly influences the effect of automatic beneficiation process. In order to achieve more accurate measurement of element grade in pulp during ore dressing， the new generation nuclear-free X-ray fluorescence analyzer was modified and developed based on the last generation nuclear online grade analyzer. The new type X-ray fluorescence online grade analyzer is based on STM32F407 control chip and the measurment structure combine the X-ray light pipe and semiconductor detector. Its technical architecture and analysis principle are as follows: X-ray light pipe and semiconductor detector constitute measurement unit， and the X-ray excited by X-ray light pipe irradiates to the surface of the measured slurry. Meanwhile， the semiconductor detector receives the X-ray characteristic fluorescence excited by the measured element in the slurry. The main control unit receives and processes the data signal uploaded by the semiconductor detector， and sends count rate of the measured element to the upper software of industrial computer through serial communication. Finally， upper software calls Matlab mathematical analysis tool and adopts BP neural network for data modeling analysis and grade value acquisition. The field test results of a concentrator in Shaoxing showed that the measurement accuracy and operational stability of the new type of X-ray fluorescence online grade analyzer are significantly improved compared with the previous generation nuclear grade analyzer，and all the parameters meets the design requirements.

Optimization and Application of ZQS Periodic High Gradient Magnetic Separator

Xu Limin, Chen Junming, Wang Lijuan, Zhong Senlin, Wang Fengyu, Wu Chengcai

2020, 49(07): 187-192.

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The development background， application scope， and separation principle and technical characteristics of ZQS periodic high gradient magnetic separator，which is special equipment for non-metallic ore purification，was introduced. The reasons for three questions of the high loss rate of concentrate， cracking of the rib plate of the vibration plate， and hydrops in the coil cavity were analyzed.The overall cost of the equipment is increased very little with optimizing the structure of the upper and bottom magnetic poles， enhancing the rigidity of the vibration plate， and making holes in the bottom plate of the coil cavity， which successfully solved the problems in the use of equipment and improved the performance of the equipment at the same time. Three optimized designs were applied to the design of the ZQS-1 000 high gradient magnetic separator and the prototype was tested in a quartz sand factory in Guangdong. Vibration ribs has no cracking， the concentrate loss rate was low， and the coil cavity had no water accumulation. Under the conditions of the feeding containing 0.0184% Fe2O3 and a processing capacity for 25.59 t/h， the quality of quartz sand is of Fe2O3 0.007 4% and meets the raw material iron contents requirements of photovoltaic glass quartz sand.

Study on Dust Removal Mechanism and Test of Cloud Fog in Metal Mine Blasting

Guo Jingzhong, Jin Longzhe, Li Gang, Wang Tianyang

2020, 49(07): 193-198.

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In order to reduce the fine dust in metal mine blasting，the technique of cloud dust removal on the whole section of roadway was proposed to purify the dust particles in the return current.By using the self-designed atomization experiment platform of cloud nozzle，the atomization effect of cloud nozzle and the influence of air pressure and water pressure on the atomization effect were studied，and the law of air flow and water flow with air pressure was obtained.When the air pressure is 0.5 MPa，the water pressure is 0.2 MPa，the water flow is 35 L/h，and the air flow is 2.65 m3/h，D50 of fog droplets is about 6.0 μm，which is the smallest particle size.Based on the atomization characteristics of the cloud nozzle and the best working conditions，the full-section cloud dusting technology of roadway was produced with the cloud dusting prototype and gas water source disposal as the main body，and the field test was carried out in Meishan Iron Mine.The study results show that the total and respirable dust efficiency after purification by fog dust removal device is 96.89%，96.04% respectively，which indicate that cloud fog and dust particle size was matching good，which can effectively reduce the fine dust concentration along the wind direction，improve the efficiency of dust and achieve better economic benefits and social benefits.

Three-dimensional Visualization Study of Land Reclamation for Open Pit Mines

Li Xiaoguang, Lu Mingxing, Li kexin, Li Fuping

2020, 49(07): 199-205.

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With the rapid development of UAV photogrammetry technology and GIS technology，oblique photogrammetry and three-dimensional modeling have been widely used in territorial planning，city planning，smart cities， etc..Traditional reclamation planning of two-dimensional mining areas is not conducive to the evaluation of the planning scheme，cannot show the planning effect and the comparison of the effect before and after the planning.Three-dimensional data is obtained by UAB oblique photogrammetry，and the three-dimensional modeling and visualization method of landscapes of land reclamation of mining area are studied by SuperMap software.Taking an open-pit mine in Tangshan City as an example，dates of the mining area is collected by UAV oblique photogrammetry，and processed by Pix4D mapper and Smart3D Capture softwares，so as to obtain the present data of the mining area.According to the present data and planning scheme，reclamation plans of the platform and slope are designed by using AutoCAD software.The AutoCAD reclamation scheme is transferred to the ArcGIS platform for unplanned triangular network （TIN） terrain modeling，the TIN mesh is converted to Sketchup in the intermediate software and then 3DMax，and the texture mapping is modeled in 3DMax.The 3DMax fine 3D model is transformed into SuperMap software format on the premise that the spatial reference is not changed.Finally，the land reclamation plan evaluation，planning effect display and planning before and after comparison are realized in the SuperMap software.The study results show that on the basis of tilt photogrammetric data of UAV，the planning model is transformed through a variety of GIS platforms without losing 3D texture rendering effect and constant spatial reference，realizing the true 3D visualization of seamless splicing of planning data and current data based on SuperMap software，which can be used for the reference for 3D modeling of mine ecological restoration planning based on UAV.

Preparation of α-Fe2O3 Photocatalyst by Iron Extracted from Iron Tailings with Sulfuric Acid Roasting Method

Mu Wenning, Lu Junda, Luo Shaohua, Lei Xuefei, Liang Jinsheng, Duan Xinhui

2020, 49(07): 206-210.

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Iron tailings are rich in valuable elements such as iron and silicon， which can be used as raw materials to prepare functional materials. The possibility to prepare α-Fe2O3 photocatalyst by iron extracted from iron tailings with sulfuric acid roasting was investigated， and the effects of acid to ore mass ratio， roasting temperature and roasting time on the extraction rate of iron in the roasting process were studied. The suitable roasting conditions were obtained in the condition of the acid to ore mass ratio of 2∶1， the roasting temperature of 280 °C and the roasting time of 2 h， in which the iron extraction rate was up to 89.80%. The iron-containing sulphate solution obtained by water leaching and filtering process with roasting clinker was treated by a neutralization precipitation method to prepare iron-containing precursor， and then calcined at 400 °C for 2 h to obtain α-Fe2O3 with a particle size of 40~50 nm， which performed good dispersibility. When α-Fe2O3 was used as photocatalytic for degradation of methyl orange， the adsorption rate of dark reaction was 56% for 20 min， and the photocatalytic degradation rate was 99% for 120 min， indicating that α-Fe2O3 has good photocatalytic performance. The results realized the comprehensive ultilization of iron from the tailings and promote practice of the photocatalytic.

Study on Mechanical Properties of Non-fired Brick Prepared from Aluminum Industrial Slag

Tang Weijia, Ni Hongjun, Xu Qian, Lü Shuaishuai, Wang Xingxing

2020, 49(07): 211-215.

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In the process of raw aluminum production， aluminum preparation and recycling of recycled aluminum， a large number of waste slag would be produced， which is called aluminum industrial slag. Up to now， the disposal method of aluminum industry slag in China is mainly stacking and landfilling. In order to alleviate the environmental problems caused by the accumulation of landfill slag from the aluminum industry and determine the feasibility of preparing aluminum slag to prepare non-fired brick， the effects of different addition amounts of lime， plaster and cement on the mechanical properties of aluminium slag non-fired brick were systematically studied. The micro-morphology and mineral composition of aluminium slag non-fired brick were analyzed by SEM and XRD. The results showed that the compressive strength of non-fired brick made from 65% aluminium slag， 10% lime， 15% plaster and 10% cement was up to 17.31 MPa in 7 days，and the flexural strength was up to 2.61 MPa in 7 days， which met the performance requirements of MU15 grade non-fired brick. Significant hydration reaction occurred inside the non-fired brick， CAH， CSH and Aft produced by hydration reaction were the main sources of mechanical properties of aluminium slag non-fired brick.

Experiment Study on Preparation of Permeable Brick from Roasted Iron Tailings

Zhao Libing, Wang Shuai, Liang Yantao, Li Guofeng, Wang Peng

2020, 49(07): 216-220.

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In order to improve the mechanical properties of tailing brick and solve the problem of tailings storage， the permeable brick was prepared through mixing， molding and curing process preparation， using the roasted iron tailings， cement and fly ash as the gelled material，iron tailings 2.36~4.75 mm as the coarse aggregate. The effect of the addition of roasted iron tailings， water/cement ratio， target porosity and vibration time on the performance of the permeable brick was investigated and performance of the unburned tailings preparation permeable brick was also compared. The results showed that: ① The optimum test conditions for the preparation of permeable brick with roasted tailings are as follow: the addition of calcined tailings of 60%， the vibration time of 40 s， the water/cement ratio of 0.3， and the target porosity of 20%. At the moment， the bending strength of permeable brick is 3.34 MPa in line with the national standard Rf3.0， and the compressive strength is 15.44 MPa in line with the national standard MU15. The permeability coefficient is 2.58× 10-2 cm /s in line with the national standard Grade A standard， and the measured porosity is 23.41%. ② When the addition of the roasted iron tailings is 60%， the best effect is achieved. When the addition of the unroasted tailings is 50%， the best effect is achieved. The bending strength and compressive strength are 3.38 MPa and 14.54 MPa， respectively. The water permeability coefficient conforms to the national Class A standard.In the condition of replacement of addition 10% cement for roasted iron tailing，the mechanical properties of roasted iron tailing is better than that of unroasted tailing，while the permeable coefficient is opposite.

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