Table of Content

15 January 2011, Volume 40 Issue 1

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Research on Numerical Simulation of Depressurized Mining Design for Inclined Medium-thick Ore-body

WANG Li-Jun, LIU Jian-Po, YANG Yu-Jiang, MA Qi-Biao

2011, 40(1):  1-4. 

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In view of poor stability of ore-body and wall rocks near ore-body in Chambishi copper mine, serious affection by ground pressure and approaches repeatedly damaged etc, 2D-numerical analysis software program was applied to make numerical simulation on stress field change law and distribution characteristics of rock mass, the mechanical mechanism of depressurized process, the parameter optimization of the mining field structure under different excavation way. The results showed that laying out a route along the veins, the stoping structure with feature of span increasing and height lowering in mined-out area can realize the depressurized mining. Under a certain thickness condition of inclined angle, the route is layout at 6 m from the bottom of ore-body in Chambishi Copper Mine, which can lower the vertical stress by 18% for next section of route after stoping. These can meet requirements of both depressurization and economic benefits.

Pillar Recovery and Covering Layer Formation Technique During Transferring from Open Stope into Caving Method

SUN Guo-Quan, FU Zhan-Yu, SUN Jiang-Xian, HU Xing-Bao

2011, 40(1):  5-7. 

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In view of the key issues to be solved during transition from open stope into caving mining method-mining bridging, pillar recovery and covering layer formation, the numerical simulation was adopted to analyze the maximum safety exposed area and stress distribution rule of a single stope in Xiagao iron ore. Then, the mining recovery process for top pillar mining and forced carving of the lower ore-body by level deep hole with the blasting parameters of line space of 3~ 4 m, and hole bottom space of 4.5 m in different divisions or partitions is drawn up. Then a smooth and efficient transition from open stope into caving method has been achieved.

Safety Protection Technique of Open-stope & Caving Mining Method in Gongchangling Iron Ore

REN Mei-Lin, REN Feng-Yu, CHEN Xiao-Yun, ZHENG Hai-Feng

2011, 40(1):  8-11. 

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Open-stope & caving method is widely applied to recover thin ore bodies of Gongchangling iron mine. This method needs to take reasonable technical measures to prevent accidents induced by rock falling of mined area. By means of analyzing the influence factors and occurrence processes of hanging wall falling, a reasonable sublevel number of ore removals is determined according to the area of the continuous falling and a continuous mining-out area is formed among the different levels to control the formation of rock falling by small pieces. Then, it is to remain some blasted ore to block the drift outlet at the last mining level to prevent the impact of air flows induced by the rock falling. These two measures can effectively guarantee the safe mining conditions of the sublevel stope & caving method and obtain a practical effect in Gongchangling iron mine.

Research on Interaction Mechanism of Water and Rock in Water Inflow of Long and Large Tunnel

CUI Fang, GAO Yong-Tao, WU Shun-Chuan

2011, 40(1):  12-14. 

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Water inflow in long and large tunnel has intimate relationship with the feature of groundwater and rock mass. Different wall-rock owns different geological structure, which shows different mechanism of destruction under the action of underground water. Taking the water inflows accidents in Dahualing long and large tunnel as a case, and based on the fieldwork and geological data, the relative theory of geochemistry and fracture mechanics are used to analyze the scale, location, inducing factors and geological conditions of water inflows of long and large tunnel in detail. According to the rock composition and geological conditions of water inflowing Tunnel, the water-rock interaction mechanism and its relationship with water gushing in this region are studied. The results show that matured water-rock interaction condition is a significant factor for inducing water inflow disasters in Dahualing long and large tunnel.

Research on Optimized Modeling Technology of Ore Block with FLAC ^3D Mechanics Analysis

KOU Xiang-Yu, JIA Ming-Tao, WANG Li-Guan, WU Xia

2011, 40(1):  15-18. 

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FLAC^3D is mainly the mechanics behaviors of simulating the geo-materials and geotechnical engineering, and can realize a numerical simulation on movement of empty area and surface in mines, and the corresponding stability analysis. But the pre-processing ability of FLAC^3D was weak and the model established does not accurately reflect the actual situation in complex engineering and geological conditions. So it should be simplified. Therefore, based on the principle of FLAC^3D mesh and three-dimensional building blocks of deposits Software SURPAC segment model approach, the block segment of model-building steps and principle for mechanical analysis are studied so as to optimize the model. It can be directly used as pre-treatment model simulation of FLAC^3D analysis, and its correctness be verified combining with the principle of elasticity. Meanwhile, the mechanical analysis by the optimized pre-treatment model combining with the actual situation of a copper mine in Yunnan verifies the feasibility and accuracy of the method.

BI-Based Operations Plan Management System for Metallurgical Mining Enterprises

MING Jian, HU Nai-Lian

2011, 40(1):  19-23. 

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In view of the current situation of metallurgical mining enterprises' value chain and information chain, the model of enterprise business plan management is developed with data warehouse, data mining and on-line analysis processing. The model shows the connection among the market forecasting, the plan management and the performance management with Deming Circle Theory. It ensures that the value chain and the information chain among the financial department, the sales department, the production department and the purchasing department are unblocked and efficient. The model continuously improves the level of the business operations management and optimizes the business operations plan. The model can meet the demands of the enterprise strategic management and support enterprises to make decisions on the business strategy. It helps to achieve the purpose of the production planning flexibility and performance of business operations. Therefore the market competitiveness of enterprises can be enhanced.

Analysis on the Stability of Bolts for Reinforcement of Rock Slope with Fissure Water Pressure

ZHUANG Xin-Shan, SONG Lei

2011, 40(1):  24-26. 

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Seepage in fissure is one of the most important factors in the failure of rock slope. There are hydrostatic pressure and hydrodynamic pressure on rock fissures by the seepage. In particular, heavy rain will bring the seepage pressure in cracks increase rapidly, resulting in landslides and other geological disasters. Rock bolt, as an effective rocky reinforcement measure, is widely applied in civil and mining engineering. Based on plastic limit equilibrium method, the reasonable value of the energy safety factor about geotechnical slope is determined from plastic work. In case that the rock fissures exist in hydrostatic pressure and hydrodynamic pressure, the slope of rock bolt reinforcement stability has been studied to establish the corresponding calculation methods and formulas. With engineering examples, the influence of seepage pressure on the stability of rock slope is mainly analyzed, as well as the anchoring reinforcement. The analysis shows that the influence of seepage on the stability of rock slope can not be ignored.

Study on Optimization of Bolt Support of Crushed Wall Rock Lane

YANG Sheng-Li, WANG Jin-Xue, ZHANG Peng, ZHENG Li-Yong

2011, 40(1):  27-30. 

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The key for bolt support of crushed wall rock lane is to guarantee the whole stability of surrounding rock. But current bolt supports of lane are always designed according to the engineering analogy method, which cannot adapt to the support parameter determination for crushed wall rock lane. The paper determines wall rock looseness range in 1 554 horizontal haulage of No. 3 Jinchuan mine by ultrasonic detection. And bolt support parameters are optimized based on this. The numerical simulation research shows that wall rock looseness range can guide the determination of bolt support parameters. According to test results of loose circle, a good supporting effect is obtained by decreasing bolt length and increasing support density, ensuring the whole stability of surrounding rock. Meanwhile, it can also reduce material consumption and save support cost.

A Numerical Simulation of Low Dilution Ore Drawing in Jinshandian Iron Mine

CHENG Ai-Ping, XU Meng-Guo, WANG Ping

2011, 40(1):  31-34. 

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The paper summarized the characteristics，function and application of PFC numerical simulation software，and starts a numerical simulation research of low dilution ore drawing to solve the problem of the high dilution rate in Jinshandian Iron Mine. With PFC numerical simulation software, a numerical simulation on two different kinds of ore drawing methods which consist of low dilution ore drawing and existing cut-off ore drawing was carried out. After comparing with the results, it is discovered that it was completely feasible to adopt low dilution ore drawing in Jinshandian Iron Mine. So, the plan of low dilution ore drawing with the cut-off grade of 30% was recommended.

Application of BP Artifical Neural Network in Optimization of Open-pit Slope Angle

HE Fang-Wei, ZHU Ming, LIU Wen-Sheng, LIU Tie-Liang, WANG Lian-Hai-

2011, 40(1):  35-37. 

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Based on the main natural and engineering factors affecting on slope stability, BP artificial neural network was applied to predict the stability of rock slope. After network training by a great deal of swatches, the reliable BP network model was elicited to forecast the optimum angle of final slope of mine, and the results were compared with the ones draw from multiple regression analysis. The study showed that the method of artificial neural network has characteristics of high precision, convergence rapidity and high fault tolerance capability, which can meet the need of slope stability prediction in engineering practice.

Selection of Mining Method with Application of Engineering Economic Principle

XU Zheng-Yuan

2011, 40(1):  38-41. 

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In view of disadvantages of traditional three-step selection method for mining method, the break-even point method and the value engineering method in engineering economic principle are introduced into the selection of mining method.  The original qualitative comparison is developed into the quantitative evaluation, which can intuitively estimate the merits and demerits of mining method with figures.

Optimization of Heap Parameters of Open-pit Waste Dump

GUO Cheng, MA Cui-Lin

2011, 40(1):  42-44. 

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HH-SLOPE software includes various limit equilibrium methods, such as Fellenius, Simplified Bishop and Thrust Transmission Method etc. It is applied to calculate the safety coefficients of slop stability at different step height and different platform width of waste dump. Regression calculation between step height and safety coefficient and between platform width and safety is acquired by applying MATLAB software, and heap parameters of waste dump are optimized step by step. On the premise of ensuring the slope safety, the volume of dump waste increases as far as possible.

Test Research on Beneficiation of Hezhang Oolitic Hematite in Guizhou Province

TANG Yun, LIU An-Rong, YANG Qiang, ZHANG Qin

2011, 40(1):  45-48. 

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The experiments on iron improvement and phosphorous reduction for Hezhang oolitic hematite in Guizhou, were carried out by high intensity magnetic separation-reverse flotation. With a grinding fineness of 77.50% -0.075 mm, the magnetic field strength of 1.55 T and the rods media, a rough high-intensity magnetic separation was conducted. Next, rough concentrate is treated by a cleaning separation under conditions of grinding fineness of -0.038 mm 84.00%, the magnetic field strength of 1.40 T and the net media. And rough tailings are treated by a scavenging separation under conditions of the magnetic field strength at 1.40 T and the net media. Then, the cleaning tailings and scavenging concentrate are mixed together and send back into the grinding closed-circuit process to obtain iron concentrate grading at 52.13% with phosphorus content of 0.45% and the recovery of 72.16%. Finally, a reverse flotation is conducted on concentrate from high-intensity magnetic separation by adopting the high-performance regulators and connectors. Then iron concentrate with iron grade of 56.14% and the phosphorus content of 0.22% and the recovery of 62.48% is achieved. The high-intensity magnetic separation-inverse flotation process provides a feasible basis for developing the oolitic hematite in this area.

Experiments of Impurity Reduction by Flotation on a High Potassium-sodium Iron Concentrate

LUO Liang-Fei, CHEN Wen

2011, 40(1):  49-50. 

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Flotation tests were made to reduce impurities on an high potassium-sodium iron concentrate. High quality iron concentrate with TFe grade of 70.24%, harmful impurities of potassium and sodium content below 0.2% were obtained by adopting SD depressant and cationic collector AY-17.

Investigation of Mineral Processing of a Fine Low-grade Refractory Iron Ore

FAN Zhi-Jian, CAO 南Jie, RAO Yu-Huan

2011, 40(1):  51-53. 

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With the continual depletion of free-milling iron ores, the development of low-grade and fine-size refractory iron ores is of great significance. A process of stage grinding-low intensity magnetic separation-high intensity magnetic separation-combination  of magnetic separation-gravity of centrifuge was used to treat a fine refractory iron ore in Qidong, with concentrate of 63.51% Fe grade and 69.24% Fe recovery obtained.

Research Progress on the Development of Siderite Resource and its Comprehensive Application

GUAN Zhong-Jie, ZHANG Gen-Lin, LAN Yao-Zhong

2011, 40(1):  54-56. 

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The paper summarized several main development and utilization methods and processes for siderite resources, and emphasized on the present research status and comprehensive application of siderite resource at home and abroad. Meanwhile, the developing prospect and research tendency of siderite were put forward.

Study on Pellet Preparation Technology of Ferruginous Powder Ore

ZHOU Long, ZHOU Yong-Sheng, WANG Li-Ge, WANG 恩Ze

2011, 40(1):  57-59. 

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Smelting the pellet of metallic powder ore is one of means in effective utilization of precious metal ore resources. With the new organic and inorganic composite binder made by ourselves, the influences of heat curing systems and binder amount to the force after ferruginous powder ore to be pellets were explored and the adaptability of the process for different ferruginous powder ore was further investigated. The results showed that the process of the first 105℃ heating for 0.5 h, and following heating to 500 ℃ for1 h, made the radial pressure resistance of the pellet samples increase from 1.573 1 kN to 1.912 2 kN. This is resulting from the clay sinter in ore powder. When binder amounted to 12%, the pressure resistance reached 1.912 2 kN and the drum index of pellet tumbler index reached 67%, which met the practical requirements of production. The experiments for different ferruginous powder ore showed that the process does not have special requirement on ore powder material, and can be widely applied.

Experimental Research on a New Combinational Collector for Bauxite Ore

FAN Li-Li, CHEN Fang-Fang, ZHANG Yi-Fei, XIE Hua

2011, 40(1):  60-63. 

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With application of a new self-developed combinational collector ZF, the positive flotation experiments of desiliconisation were carried out on a kind of bauxite in Shanxi Province, which was mainly composed of kaolinite and diaspore with Al₂O₃grade of about 63.16% and the alumina-silica ratio of 5.32. Under grinding fineness of -0.074 mm 84.51%, sodium carbonate of 3500 g/t and sodium silicate of 113 g/t and collector ZF of 800 g/t, a concentrate with Al₂O₃ grade of 68.92%, Al₂O₃ recovery of 81.05% and the Al/Si ratio of 9.16 was obtained by the process of one-roughing, one cleaning and two scavenging.

Investigation on Properties and Structure of Pyrrhotite and the Difference of its Floatability

HONG Qiu-Yang, TANG Yu-He, WANG Yu-Hua, LIANG Dong-Yun, YU Lian-Xiang

2011, 40(1):  64-67. 

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There are three main polymorphs in pyrrhotite: hexagonal pyrrhotite, monoclinic pyrrhotite and orthorhombic pyrrhotite. The chemical composition, physical properties and crystal structure of pyrrhotite determines its floatability, surface oxidation and brittleness, etc. In this paper, X-ray diffraction, electron probe analysis and flotation tests were adopted to investigate the structure, composition and floatability difference of hexagonal pyrrhotite and monoclinic pyrrhotite. The results show that monoclinic pyrrhotite is richer in sulfur than the hexagonal pyrrhotite, and the recovery variation of the two kinds of pyrrhotites with pH is similar, but the recovery of monoclinic pyrrhotite is higher and the floatability is better than that of hexagonal pyrrhotite. In the acidic condition, the hexagonal is easier to be activated by Cu²⁺ than monoclinic pyrrhotite. Lime shows a certain inhibition on hexagonal pyrrhotite, but no obvious inhibitory effect on monoclinic pyrrhotite.

Study of Chalcopyrite-marmatite Self-induced and Controlled Electric Potential Flotation

GAO Li-Qiang, SONG Yong-Sheng, LI Wen-Juan

2011, 40(1):  68-71. 

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The basic behavior of self-induced flotation and controlled electric potential flotation of chalcopyrite and marmatite were investigated in this paper. It was shown that chalcopyrite exhibit good self-induced floatability in wide pH range and its flotation behavior can be controlled by the externally controlled voltages. Marmatite can realize self-induced floatability in acidic condition and its self-induced floatability can be controlled by the externally controlled voltages. While marmatite can not realize self-induced floatation and hardly improve its floatability by varying externally controlled voltages in alkaline condition. Reaction products by the surface oxidation of two minerals were studied by measuring the cyclic voltammetric curves, where the elemental sulfur was the main hydrophobic entity.

Experimental Study on the Cyclonic Static Micro-bubble Flotation Column for a Copper Ore

KONG Ling-Tong, CAO Yi-Jun, XU Hong-Xiang, SUN Yong-Feng

2011, 40(1):  72-74. 

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For a refractory copper ore with feature of fine particle and ease-to-slime, a new flow-sheet of partially preferential flotation was proposed, that is, raw ores are separated after crushing and grinding by the high efficiency and energy-saving micro-fine separator with cyclonic-static micro-bubble flotation column to directly get some final qualified concentrate. By this way, the problem of low recovery capacity by micro-fine flotation machine for a copper mine which result in metal loss are resolved. And the pilot experiments are carried out by adopting the optimum conditions. The results show that the high quality copper concentrates are obtained by this flow-sheet, which contain Cu of 21.46% with a 30.04% of recovery rate．

Research on Vat Bioleaching of Low-grade Primary Copper Sulfide Ore Under Catalysis Conditions

ZHANG Wei-Min, GU Shi-Fei, SUN Zhan-Xue

2011, 40(1):  75-77. 

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Taking activated carbon，Ag⁺and Fe²⁺ as a combined catalyst, the vat bioleaching effect of low-grade primary copper sulfide ore from Yongping Copper Mine under catalysis conditions was investigated. The results showed that the vat bioleaching effect of low-grade primary copper sulfide ore was significant, but the aeration quantity had a great effect on the leaching. The aeration quantity of 25 mL/s was most beneficial to the leaching of copper, in this case, the leaching rate of copper reached 42.4％ after 455 h leaching. The acid-treated solution can replace 9K+S medium as leaching agent, in this case, the leaching rate of copper reached 41.8％ after 335 h leaching, which was increased more than 1.7% by using the acid-treated solution instead of 9K＋S medium.

Experimental Research on Beneficiation of Pusong Gold Mine of Nyemo County, Tibet

TAO Zhuan, WAN Quan-Li, LIU Qi, LA Ba-Ci-Ren

2011, 40(1):  78-80. 

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Such beneficiation tests as gravity-tailings cyanidation, all slime cyanidation and column leaching tests, etc were carried out on Pusong quartz-vein type gold ore of Nyemo county of Tibet with gold leaching rates of 96.24%,93.88% and 85.97% respectively. It is shown that this gold ore is easy to be separated (smelted). In view of its special geographical location, the gold deposit is fit for heap leaching production.

Progress on Flotation Technique of Non-ferrous Metals in China

WANG Zhong

2011, 40(1):  81-84. 

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The general situation of non-ferrous metals resources in China is introduced briefly in the paper. Then, the recent new progress of flotation technology for non-ferrous metals is reviewed from the aspects of flotation theory, process, reagent and equipment. In addition, the paper prospects the development direction for the future.

Visualization and Incision of Geo-body Based on Tetrahedral Network

ZHANG Wei-Jun

2011, 40(1):  85-88. 

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Three-dimensional modeling of the Geo-body is a critical issue in 3D GIS. Considering the current 3D modeling and combining with the characteristics of geologic body, a new 3D GIS model based on tetrahedral network (TEN) was proposed. The model uses the drilling data as the original data, and TEN is established with delaunay rule. Then, the TEN is parted to describe its inner structure construct. It can not only accurately simulate the stratum to reflect the internal structure of geo-body, but describe the spatial entities with complex boundary.

3Dmine-Based Three Dimensional Modeling of High Phosphorous  Hematite Mine of Liangshuijing Orefield in West Hubei

YE Hai-Wang, WANG Rong, HAN Ya-Min, LIU Jing-Xiu, CHANG Jian

2011, 40(1):  89-92. 

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The three dimensional model of high phosphorous hematite mine in west Hubei is constructed with the help of the domestic mining software 3Dmine. On the basis of introducing the theory of the 3D modeling, triangulate irregular network, block modeling principle and ore grade estimation based on block modeling, the deposit geological database is built, and the block model among deposit surface, fault, ore-body, geological limit and ore grade is established. The new model is quite close to the real terrain and can accurately reflect the geological structure, which provides a basis for mineral resources assessment, mining design and production scheduling preparation.

Reserves Estimation for Yunfu Gaochang Deposit Based on 3D Geological Modeling of Ore-body

ZHANG Yan, ZHOU Yong-Zhang, LI Wen-Sheng, WANG Zheng-Hai, HOU Wei-Sheng, WANG Lin-Feng

2011, 40(1):  93-97. 

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In 3D visualization environment, the grade and reserves of ore-body can be estimated rapidly and precisely. First, the geological database and related 3D solid model are built based on the geological exploration data by 3D visualization software to simulate the shape of the ore-body. Next, the block model of ore-body is formed to divide the internal ore-body, and then the internal specialty data of ore-body blocks are evaluated by geo-statistics method to get all specialty data of ore-body blocks. At last, the paper accomplished the analysis and estimation on the grade and reserves of ore-body. With the help of large 3D visualization mine software Micromine, the ore-body block model is established based on the geological database and 3D solid model for a metal mine in Yunfu Gaochang deposit. The ordinary Kriging method and the distance power inverse ratio method are used to analyze and estimate the ore-body grade and reserves according to the actual boundary grade of metal resources. Then, the estimated results above are compared with the reserves obtained from actual production. It is proved that the visualization method is effective and reliable.

Application of Support Vector Regression in GPS Height Transformation in Mining Area

LIU Xiao-Jun, SUN Jiu-Yun, ZHOU Feng

2011, 40(1):  98-101. 

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Based on the theory of statistics and the principle of Support Vector Machines(SVM), it is put forward that Support Vector Regression(SVR) is applied into the GPS height transformation in mining area to refine the quasi-geoid in mining area. And investigation on the application of Support Vector Regression, polynomial and GA-BP neural network in GPS height transformation are carried out. The test results show that the precision of fitting data of SVR is superior to that of polynomial and GA-BP. Moreover, SVR can effectively overcome many shortcomings existing in neural network, such as difficult topology selection, over-learning, inevitable local extremum etc.

Application of Controlled-Source Audiomagnetotellurics (CSAMT) in Prospecting of Xishimen Iron Mine

WEN Xiao-Gui

2011, 40(1):  102-103. 

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Through the analysis of results by Controlled-Source Audiomagnetotellurics prospecting, and combined with the existing drilling information, the abnormal area revealed by the controlled-source audiomagnetotellurics was studied. On this basis, the geological drilling was used to probe the existence of iron ore in the deep metasomatic deposits of Xishimen Iron Mine. This prospecting method of combining with geophysical information and drilling is an important direction of geophysical prospecting for modern mine.

Developm ent and Application of New Type High Efficiency Mineral Processing Equipment

ZHAO Rui-Min

2011, 40(1):  104-108. 

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The structures characteristics and application results of BK，CTB-1245，BKB special multi-pole magnetic separator are introduced chiefly. It shows that these new type high efficiency drum magnetic separators play an important role in improving mineral processing efficiency and economic benefit.

Experimental Research on Compression Crushing Process of Granular Layer

NI Su-Huan, CHEN Qing-Guo, HOU Shu-Jun

2011, 40(1):  109-111. 

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In rigid metal containers, that is piston pressure equipment, experimental study on compression crushing of granular layer is carried out. Compression crushing process of loose granular layer at different maximum pressure, different thickness and different particle size are tested to obtain the restoring force-displacement curve of granular layer and the particle size distribution curve and to analyze different impact rules of curves on crushing. After further experiments, the relationship curve of energy absorption with the displacement, pressure intensity and the influence curve of energy absorption and particle size on crushing ratio are established. Through comparative analysis on the curves above, it is concluded that energy absorption is the most important factor for crushing ratio. The energy absorption can impact directly on the crushing effect of particles.

Modal Characteristic Analysis and Dynamic Strength Checking of the Vibrating Screen Box

SU Mei, TONG Xin, LIU Qiang, ZHANG Ka-De, WANG Gui-Feng

2011, 40(1):  112-116. 

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Based on practical experiences and comprehensive analysis of vibration screen system, a parameterized finite element model of Vibrating Screen Box was set up by a 3D software and the related issues in modeling were also discussed. The first 14 step natural frequencies and its relevant normal modes of the screen box were gained by modal analysis of the vibrating screen box. The distribution rule of all the nodes displacement and dynamic stress were identified by harmonic response simulation. Based on the simulation results, the dynamic rigidity and strength of the Vibrating Screen Box were checked. The results showed that the established finite element model of the screen box was well coincide with the actual structure, which also can satisfy the requirements of stress analysis. According to the modal analysis, the natural frequency is not coincident to working frequency, so there would be no resonance occur during work. According to the harmonic response analysis, the dynamic rigidity and strength of the screen box can meet the design requirement. This paper proposed a theoretical basis for designing large-sized and heavy-duty Vibrating Screens.

Experiments and Application of D4FMVSK1014 Dual Vibration Screen in Shirengou Iron Ore

ZHANG Chun-Fang, MEI Guo-Sheng, YANG Fu-Jun, KANG Qing-Min

2011, 40(1):  117-119. 

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Shirengou Iron Mine cooperated with Tangshan Landsky Technology Co., Ltd. and made a full success in Shirengou Iron Mine. In view of low capacity and low screening efficiency of high frequency vibration fine screen and other issues in Shirengou iron mine, the industrial tests of D4FMVSK1014 dual vibration screen are carried out. The testing results show that the screen can not only solve such problems in ordinary machines as low capacity, short life and more floor area, but can maintain a high screening efficiency and prolong the screen life with compound vibration and instantaneous strong vibration screen technology as a prominent feature. From aspects of screening theory, field application effect and economics, this fine screen suit for the current production process of Shirengou iron ore.

Application of Fluent Software to the Optimal Design of Agitator in Gravity Separator

HUANG Peng, YU Sheng-Li, LU Dong-Fang, WANG Yu-Hua

2011, 40(1):  120-123. 

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According to the properties of bauxite, a new gravity separator for silicates removal from bauxite has been designed for the pre-separation of bauxite. Based on the determination of optimal process parameters, the agitator, the key component of the gravity separator, was optimized. The software of GAMBIT was used to establish the three-dimensional entity model and grid generation. Based on standard turbulence model   and FVM (Finite Volume Method), combined with three-dimensional incompressible reynolds-averaged navier-stokes equations, MRF (Multiple Reference Frame), the flow field inside the equipment were simulated with CFD(computational fluid dynamics) numerical software Fluent for different agitators. The results show that the increase of arm incline angle of agitator can not improve the distribution difference of alumina and silica. With the increase of horizontal agitator tooth depth, the turbulence intensity change gradient on the surface reduced gradually and the turbulence intensity tended to be even, and the ratio of Al/Si of underflow was improved greatly. but there was only a small decline of the yield ratio and Al2O3 recovery. Actual ore separation experiments verified the feasibility that Fluent numerical simulation can be used to design agitators.

Experimental Research on the Acid Mine Wastewater Treatment with Sulfate-reducing Bacteria

YU Shui-Jing, PENG Yan-Ping

2011, 40(1):  124-127. 

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In this study, a continuous upstream anaerobic reactor is used to treat acid mine wastewater, and its process parameters such as the hydraulic retention time, influent pH, influent loading on the effects of sulfate reduction are tested. Optimum process parameters of the hydraulic retention time 8 d, COD/SO^2-₄ 1.6, the influent concentration of SO^2-₄  2.3 g/L and influent pH=6.0 are obtained. Under the same conditions of temperature at 30 ℃, HRT of 8 d, COD/SO^2-₄  of 1.6, the influent concentration of SO^2-₄ 2.3 g/L, influent water of pH=4.5 and the dilution multiple for 3 times, the upstream anaerobic reactor continuously and successfully operated for 59 d. After 24 d, the average sulfate removal rate was75.35%, copper ion removal was 99.98%, removal rate of iron ion was 88.87%, and effluent water reached the industrial discharge standards.

The Influence of Sulphide Tailing Water on the Flotation Performance of Pyrite

YANG Hai-Rui, CHEN Xiu-Zhi, SUN Chun-Bao

2011, 40(1):  128-131. 

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This paper investigated the influence of sulphide tailing recycling water of Huize lead zinc mine on the flotation performance of pyrite. Then taking butyl xanthate and diethyl dithiocarbamate as the collector, the differences of floatability of pyrite in tailing water and deionized water were researched. In the condition of taking butyl xanthate and diethyl dithiocarbamate as the collector in deionized water, we zinc sulfate, cupric sulfate and sodium silicate are respectively added as modifiers to influence the floatability of pyrite. The result showed that some special elements in tailing water play a great inhibitory action on floatability of pyrite. Directly recycling tailing water would cause adverse effect on pyrite flotation. Butyl xanthate and diethyl dithiocarbamate have good collecting ability to pyrite, and the modifiers of zinc sulfate, cupric sulfate and sodium silicate influence the floatability of pyrite differently in condition of various collectors.

Simulation and Prediction of Land Utilization Evolution in Coal Mining Area

WANG Xing-Feng, WANG Yun-Jia-

2011, 40(1):  132-135. 

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The accurate simulation and prediction of the land utilization evolution of mine, is an important basis for determining the land use planning, land reclamation measures. Taking into account of the superior performance of the cellular automaton model (CA) in the land-use modeling and prediction, the CA model is introduced to the simulation and prediction of the evolution of land utilization. But it is very different for land use changes in coal mine area from urban regions. The high tension exploitation of coal resources is one of the important elements that affect the evolution of land utilization. Based on the basic principles of coal resources development, EMMLCA (Evolution Model of Mining-induced Land Based on CA）model of land use evolution under coal mining is established to simulate and predict the changes of land use in mine area. To test the efficiency of the model, the changes of land use in Lu'an coal mine area is simulated and predicted based on EMMLCA model. Result shows that the model is both feasible and effective, thus its predicted results can be taken as accurate and reliable data for the land use plan of coal mining area.

Application of GPS Technique in the Slope Safety Monitoring of Opencast Uranium Mine based on VBA

ZHU Yu-Feng, WANG Wei-Zhong, WANG Jing-Chao, ZHU Guo-Gen

2011, 40(1):  136-138. 

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The slope deformation is the most notable and direct reason for causing the geological disaster. If we can accurately forecast the landslide in some sort, the loss of disaster will be farthest decreased. Combining with practical circs of one larger-scale opencast mine, the system of GPS slope safety monitor of opencast mine in the application of uranium mine is discussed in detail, and also the auto-drawing curves system in slope safety displacement by means of exerting VBA, an AutoCAD inner-embed program language is explored to improve the slope safety of opencast mine finally.

Study of Three-dimensional Risk Assessment Model for Gob

MA Hai-Jun, HUANG De-Yong

2011, 40(1):  139-141. 

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The investigation on the existing risk assessment methods showed that two-dimensional risk assessment model was one-sided and inadequate. On the basis of introducing the importance of risk factors of gob into the research, a three dimensional risk assessment model for god is proposed. A risk evaluation system is built for mined-out area of a Manganese Mine in Yunnan, and the quantitative evaluation on likelihood of risk in gob, risk seriousness, of the consequences and the importance of risk factors of for to calculate out the risk of risks will be determined by the scoring method from experts. Then the evaluation is classified to get an unacceptable impact of risk factors on the mined-out area.

Research of Comprehensive Control Measures for Tailings Dust

LI Rong-Hai, YU Miao, ZHU Wan-Gang, ZHANG Ren-Qiang

2011, 40(1):  142-146. 

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Environmental Protection of Mining Development Limited Company)〖SX）〗Abstract        Through analyzing the status of tailings particle size, the dam height, the length of dry bank, and the tailings discharge methods and the relevant scientific experiments, it is shown that dust is generated from tailings mainly due to fine size of tailings, high speed wind at dam, too long dry bank, and worse management on multi-pipe discharging. For tailings dust treatment, the paper takes the comprehensive dust control measures, among which controlling the length of dry bank and strengthening the management of multi-pipe discharging belong to the measures in production. At the key sites, tailings dust can be controlled by dust covering agent, water spray at dry bank, greening of dry bank and other measures based on the chemical composition of tailing, water and power supply situation at the reservoir and the situation of sub-reservoir.

Application of Direct-reverse Flotation in Reconcentration of iron ore tailings from Reverse Flotation

LIU Wen-Gang, WEI De-Zhou, WANG Xiao-Hui, GAO Shu-Ling

2011, 40(1):  147-149. 

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Direct-reverse flotation was used in re-concentration of reverse flotation tailings of hematite ore, which was taken from Qidashan dressing plant. The results show that when 2,4-dihydroxybenzoic acid was used as depressor for of 550 g/t, depressor dosage of 800 g/t for 5 min flotation respectively, rough concentrate with 78.85% Fe recovery and 31.86% Fe grade was acquired without addition of pH regulator. Reverse flotation tests with rough concentrate showed that when ore was ground to 95.50% -0.045 mm, iron concentrate with 66.17% Fe grade and 27.27% Fe recovery was obtained by process of one-roughing, two-cleaning and one-scavenging.

Experimental Researches on Comprehensive Utilization of Roasting-cyanided Tailings

XIE Jian-Hong, ZHANG Chong-Hui, LI Hui, LIU Si-Wei, WANG Su

2011, 40(1):  150-152. 

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Experimental researches on comprehensive recovery and utilization of a cyanided tailing are carried out. The test results show that with roasting-magnetic separation flow-sheet, a final iron concentrate with a yield of 53.78%, Fe grade of 55.46% and recovery of 76.73% is obtained, which can be used as low grade raw material or blast burden in iron making.

Impact of Ammonia on Alkaline Copper Tailings Bioleaching

LIU Wei-Fang, WANG Hong-Jiang, HUANG Ming-Qing, WU Ai-Xiang

2011, 40(1):  153-157. 

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In view of low copper bioleaching rate of acclimatized alkaline bacteria on copper tailings, biochemical leaching tests by adding appropriate amount of ammonia are carried out, which are compared with the results of single chemical leaching tests to find out the right way for tailings leaching. The results show that in pure ammonia leaching test, copper leaching grows slowly with the ammonia increased to a higher concentration; In the combining leaching tests, a higher copper leaching rate of 35.57% can be achieved when the initial concentration of ammonia is 40g / L within about 30 d; The single alkaline bioleaching can reach maximum leaching rate of 24.51%; Under the same conditions, the leaching rate with single ammonia is only 11.98%; And the combining leaching rates are increased by 11.06% and 23.59% respectively. It can be seen that low concentration of ammonia can promote the bacteria leaching.

Effect of High Efficient Super Plasticizer on Performance  of Iron Tailing High-quality Concrete

CUI Xing-Lan, NI Wen, LIU Qian

2011, 40(1):  158-161. 

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The cementitious materials was formed by three steps milling of Miyun iron ore tailings with water quenched high furnace slag, cement clinker and desulfurized gypsum, and then was mixed with iron tailings to prepare high performance concrete by adding high efficient super plasticizer, in which the total content of iron tailings was 70% by weight. The effect of high efficient super plasticizer on the concrete samples was studied by varying the types and dosage of super plasticizers when the experimental conditions and other parameters were fixed. The results showed that polycarboxylate-based super plasticizer has good effects on the workability of fresh concrete. The hardened concrete samples blended with UNF-5 own highest compressive strength at each stage and reach 80 MPa at 28 d.

Preparation of Micro-porous Calcium Silicate with Coal Series Kaolin

WU Ze-Guang, SHI Song-Lin, LIU Qin-Fu

2011, 40(1):  162-164. 

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Through hydrothermal synthesis process, micro-porous calcium silicate powder was prepared with coal kaolin and lime as raw materials. The powder was characterized by the measure of XRD, SEM, TGA/DSC and FT-IR. The results showed that the powder was semi-crystalline calcium silicate with particle size of 10~20 μm, and the particles owned loose internal structure with many irregular-shaped micro-pores of 1~2 μm.