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    15 October 2007, Volume 37 Issue 10
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    Status Quo of Large and Medium Slopes in China Non-coal Open-Pit Mines and Countermeasures
    WANG Qi-Ming
    2007, 37(10):  1-5+10. 
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    Mine safety production is sensitive to the national image and is an important issue gaining attention both in and outside China. The safety situation in both metal and nonmetal mines is not optismetic as mine accidents frequently occur. Open-pit mining production occupies a large proportion in mining in China and nearly 40% of the open-pit slopes have the problem of instability, with the more serious disasters occurring in medium and large size open-pit slopes in both metal and non-metal mines. Such slopes are characterized by great slope height and complex engineering geological conditions. With the increase of the mining depth, the slope stability tends to be increasingly more serious and the disasters such as slope sliding have become the major disastors endangering the safety mining and the security of people's life and property. Based on the summary of the survey data, the status quo of the medium and large size open-pit slopes in both metal and non-metal mines in China are analyzed and the specific countermeasures are proposed.
    Problems in Imported India Iron Ore and Countermeasures
    HU Shun-Feng, YANG Li-Ming, LI Yi-Xuan, WANG Jian-Jun
    2007, 37(10):  6-10. 
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    The paper specifies the important position of India iron ore in China's imported iron ores, outlines its characteristics and analyzes its quality problems in moisture, iron grade, particle size and impurity element content and their causes. The countermeasures and suggestions are therefore made on eliminating the quality problems in India iron ore such as to standardize the import channel, to strengthen the exchange and share of the inspection information of imported iron ore, to promote the technical exchange and cooperation between China and India in iron ore inspection, to push the implementation of pre-loading inspection and to further clarify the related clauses in iron ore contracts.
    Status Quo and Prospect of Research on Technology for Mine Land Reclamation and Ecological Reconstruction
    ZHOU Jin-Hua, HU Zhen-Qi, GAO Rong-Jiu
    2007, 37(10):  11-13. 
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    The status quo of land reclamation and ecological reconstruction both in and outside China and the new progress in the technology for land reclamation are presented, including reclamation soil erosion control technique and its industrialization, water conservancy, seed sowing and covering technique, man-made “surface soil” technique, effective bio-technique in the reclamation of mine solid waste, multi-covering technique of tailings. The present and future four research fields are suggested: technique of preventing the pollution of acidic mine waste, technique of preventing and controlling the water and soil loss under the slope, technique of soil reconstruction and fertility cultivation, and technique of topographic restoration and landscape design in land reclamation.
    Progress in and Trends of Mining Technology for China's Metal Mines
    LIU Rong, LI Shi-Jie, LU Cai-Wu
    2007, 37(10):  14-17+46. 
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    The paper describes in a systematic and all-sided way the main achievements of the mining technology of China's metal mines in open-pit mining, underground mining and the control of mining environment, discusses the present state, characteristics and application condition of the main mining technology used in China's metal mines and analyzes the development trend of domestic mining technology from the aspects of mining equipment, drilling and blasting, mining system, mine digitalization and intellgentialization and manless mining.
    Strategy Analysis for the Continuable Development of China's Iron Ore Resource
    HOU Hui, HU Wang-Yang, LI Bing
    2007, 37(10):  18-21. 
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    The supply status quo of China's iron ore has been generalized both from the internal and external aspects; furthermore, in accordance with the rapid appreciation of international iron ore and the SWOT analysis for the continuable development of the iron ore resource, concrete tactic choices have been carried out as follows: Strengthen macro-control, exert the function of government, comprehensively utilize the economic instrumentality of market to allocate the iron ore resource reasonably and effectively; implement strategy for multiple sources of iron ore, take full use of iron ore resource both from internal and external to make sure of the supplement of iron ore in China, thereby realizing the continuable development of China's iron ore resource.
    Thought on Perfection of China's Mining Legal System
    LI Qing-Bao, SUN Huo-Ran
    2007, 37(10):  22-24+33. 
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    Great progress has been achieved in the legal structures in China's mining field in the past 20 years and however, the problems have also become evident. Starting from the practically existing problems in the mining legal system, it is pointed out that whole modification and perfection of China laws concerning mineral resource have no time to delay. Specifically, perfection should be made in four aspects, namely the right ownership system of mineral resource, mining right system, tax-fee reform and way of civil legal remedy. A sound and clear right ownership legal system of mining resource should be established. It is proposed to clearly specify the quasi-property nature of mining right, pay attention to mining right equity, perfect the acquisition and circulation system of mining right. It is hoped that it sould be some help to the perfection of China's mining legal system.
    Research on Integrated Construction Technology for Tunnel Conjunction in Complex Geological Circumstance of Igneous Rock
    ZHANG Hou-Quan, HAN Li-Jun, HUANG Xing-Gen, HE Yong-Nian, WANG Jin-Ge
    2007, 37(10):  25-28. 
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    Gushan Iron Mine of MaSteel Group is in typical complex geological circumstances of igneous rock and the traditional support can't meet with the requirement on tunnel stability. In order to adopt a reasonable excavation and support scheme, research was made for the N14 tunnel conjunction which is near to the south working face at the shaft bottom of -300 m level of Hou Hemuhan mine section. It is decided to adopt the pilot tunnel method for the excavation. According to the site geological characteristic and the support mechanism of bolting-shotcreting, bolting-grouting and pre-stressed anchor cable, it is decided to adopt a combined support scheme consisting of bolting-shotcreting for the primary flexible support and bolting-grouting and pre-stressed anchor cable for the secondary strengthening support, which has achieved good technical effect and economical benefit. The results show that the flexible stress-release support should be timely executed for the construction at the conjunction with great disturbance, the fractured and dilatable surrounding rock be rapidly sealed, and the support method combining bolting-grouting and pre-stressed anchor cable be used for large cross-sectional tunnel or the surrounding rock in large loose zone.
    Grouting Support Technology of High Toughness Fiber Reinforced Concrete for Deep Roadway in Soft Rock
    BI Yuan-Zhi, ZHU Zan-Cheng, BI Yong-Zhi, SONG Wei-Dong
    2007, 37(10):  29-33. 
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    The plain concrete grouted layer will have a large quantity of small primary cracks in the concrete formed during its solidification, which can reduce the tensile strength and fracture toughness. The wall rock in deep roadway in soft rock will have great deformation and therefore requires a strong support strength and certain deformation degree and toughness of the support material. In view of this, it is proposed to use CTA modified polypropylene (coarse) fiber reinforced concrete to replace plain concrete. A large number of tests show that modified polypropylene (coarse) fiber can function as micro rib and increase both the toughness and strain capacity of the concrete at the same time of improving its strength. The stress simulation analysis of the roadway wall rock indicates that when the excavated roadway is lined by fiber reinforced concrete grouting, the shear failure zone will be transfered to the depth of the wall rock, greatly reducing the shear failure zone at roadway hance. It indicates that when used in the support for deep roadway, fiber reinforced concrete grouting can better depress the failure of the wall rock due to the increased strength and toughness, which can be a reference to engineering practice.
    Pilot Test on Blasting Crater in Deep Orebody of Anqing Copper Mine
    WANG Xing-Ming, ZHANG Yao-Ping, WANG Lin, FU Yu-Hua
    2007, 37(10):  34-36+50. 
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    In light of the characters of the No.2 orebody in Anqing Copper Mine and based on Livingston blasting crater theory and through the single-hole blasting crater tests on SK-Cu ore, Fe ore and Fe-Cu ore respectively, the optimal technical parameters of the blasting crater were obtained. On this basis, the optimal blasting parameters for the drilling-blasting of this orebody were also drawn, providing a precious basis for the future reduction of the drilling-blasting cost, improvement of the safe mining technology for gently inclined orebodies, the decrease of large fragmentation rate and the intensification of ore drawing.
    Study on Flow Velocity of Bulk at Drawing Opening and Its Significant Influence Height
    QIAO Deng-Pan, MA Zheng-Wei
    2007, 37(10):  37-41. 
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    The development of modern underground mine has promoted the continuous input and application of larger drilling and ore drawing equipment, which has in turn led to an increasing larger haulage drift and cross section of drawpoint. The practice shows that the flow velocity of bulk ore rock at the stope drawpoint and the dimensions of drawpoint have remarkable influence on the drawing effect. According to the state of bulk ore rock flow at the drawpoint, the velocity distribution of the bulk ore rock drawing by bottom funnel-short pass and scraper mucking is analyzed. The affecting mechanism of the drawpoint on the ore drawing is disclosed, which is of guidance significance to the determination of rational stope structural parameters.
    Numerical Simulation Analysis for Cut-and-fill Mining Process of An Underground Mine Using ABAQUS
    TAO Gan-Qiang, SONG Li-Xia, SUN Bing, DING De-Xin
    2007, 37(10):  42-46. 
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    Based on the data obtained in the site geological survey and laboratory test，a mining model is built and numerical analysis is made of the orebody mining and filling processes by employing the large three-dimensional finite element software ABAQUS to obtain the distribution law of the stress field and displacement field for every construction step. The results show that when the method of upward horizontal slicing with cemented filling is used, cemented filling and tailings filling can be used to effectively control the stability of the wall rock of the stope. The filling body can effectively depress the stress release and deformation of the wall rock, thus retarding the release rate of the energy preserved in the rock strata so as to avoid the dynamic pressure such as impact ground pressure. A comprehensive assessment is also made of the stope stability and safety and some very beneficial conclusions are drawn.
    Observation of Seismic Effect of Excavation Blasting and Discussion on Technical Measures for Its Safety
    CHEN Ping, HUI Hong-Bin
    2007, 37(10):  47-50. 
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    Blasting is a process of an instant impact of huge energy release on medium. The seismic effect, shock wave and flying rock induced by blasting are commonly recognized as “three great public hazards” due to the destruction function of blasting. In combination with a practical engineering, the seismic effect of various types of blasting was studied and the effect of its different particle vibration velocities at various altitude differences on the safety of buildings or structures analyzed. Based on this, the blasthole pattern parameters were regulated so as to ensure the safe execution of the excavation blasting under complex topographical environment conditions, which has achieved good economic and social benefits.
    Single-Factor Model for Option-Based Evaluation of Mineral Resource Mining Right
    ZOU Shao-Hui, ZHANG Jin-Suo
    2007, 37(10):  51-54+63. 
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    The mining right of mineral resource can be considered as a multi-stage compound call option. Based on the mechanism research of the option-based value formation of mining right, and under the assumptions of no transaction cost of mining right, no cost of mine opening and closing, a permanent discard of mine and a no-risk interest, the authors study the single-factor model for the option-based evaluation of the mining right of mineral resource at a random variation of the reserve value of mineral resource,and compare the income current value method with the single-factor model in combination with a real case of coal resource. It is found that the option evaluation method can increase the value of the mining right of mineral resource when compared with the income current value method.
    Test and Application of SLon Magnetic Separators in Bao Tou Steel's Concentrator
    XIONG Da-He
    2007, 37(10):  55-58. 
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    Bao Steel' concentrator adopts a flowsheet consisting of low intensity magnetic separation, high intensity magnetic separation and flotation to recover iron concentrate and rare-earth concentrate. The originally used high intensity magnetic separation equipment was φ3200 horizontal ring separators, which had the deficiency of easy blockage of magnetic medium that could lead to deterioration of metallurgical performance. Therefore, based on the lab exploratory test, a series of industrial comparative tests were made between SLon-2000 vertical ring pulsating high gradient magnetic separators andφ3200 horizontal ring separator. The results indicated that for the high intensity magnetic separation operation, SLon separators, when compared with the horizontal ring separators, can improve the iron concentrate grade by 4.05 percentage points and iron recovery by 16.72 percentage points. According to this, the concentrator has gradually replaced the original separators by SLon magnetic separators. The production practice has proven that SLon magnetic separators can not only greatly improve the metallurgical performance but have the advantages of small water consumption, unblocked medium, stable operation, small maintenance and high availability.
    Phases in Pyrite Bio-Oxidation Process
    JIANG Lei, ZHOU Huai-Yang, PENG Xiao-Tong
    2007, 37(10):  59-63. 
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    The change in the iron ion concentration, pH and Eh in the Fe3+ oxidization and bio-oxidation process of pyrite is studied by using Acidithiobacillus ferrooxidans. The results show that as Fe3+ will rapidly be consumed, it has a low oxidation rate for pyrite while the presence of bacteria can continuously oxidize Fe2+ into Fe3+, thus evidently accelerating the pyrite oxidation rate. Therefore, bio-oxidation has higher efficiency. Based on the indirect function mechanism and in light of the change law of pH and Eh in the bio-oxidation process of pyrite, it is suggested that the phase characteristics of pyrite bio-leaching can be divided into three phases, namely, phase I (inorganic oxidation of pyrite), phase II (bio-oxidation of Fe2+) and phase III (equilibrium bio-oxidation of pyrite).
    Electrochemical Oxidative Behavior of Pyrite during Ore Bioleaching
    WU Biao, RUAN Ren-Man, WEN Jian-Kang, ZHOU Gui-Ying
    2007, 37(10):  64-67. 
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    Most of secondary copper sulfides are associated with pyrite in the nature. Pyrite's over-dissolution in bioleaching can lead to acid-iron imbalance in the leaching system. Based on the atom orbit and molecular theory, the electrochemical dissolution mechanism of pyrite is analyzed and it is considered that redox potential is the key factor influencing the pyrite dissolution. Tests on pure pyrite by sulfuric acid leaching, ferric sulfate leaching and Leptospirillum are made. The results validate that when there are no bacteria, the redox potential will be basically lower than 700mV and the pyrite is hardly dissolved, with an iron leaching rate lower than 10%. When there are bacteria, the redox potential can be raised to higher than 800mV, speeding up the pyrite dissolution, with the iron leaching rate as high as 67%.
    Study on Beneficiability of A Magnesite Ore from Liaoning
    SUN Ti-Chang, WANG Jin-Liang, ZOU An-Hua, CHANG Liang
    2007, 37(10):  68-71+74. 
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    In view that the main gangue of a Liaoning magnesite ore is quartz that has a very fine dissemination size, a reverse flotation flowsheet with one rougher and one cleaner in alkaline medium was adopted. The flotation was carried out at a ground fineness of 90% -200 mesh using SE as the collector. A magnesite concentrate having a weight yield of 73.31%, an MgO grade of 47.39% and SiO2 content of 0.28% was obtained.
    Experimental Research on Lead-Zinc Separation of Refractory Lead-Zinc Ore from Guangxi
    LIN Mei-Qun, WEI Zong-Wu, MO Wei, CHEN Qing-Fa
    2007, 37(10):  72-74. 
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    In view of the difficult lead-zinc separation of a refractory lead-zinc ore from Guangxi due to the close intergrowth of lead-zinc minerals and the fine dissemination size, a preferential flotation flowsheet was used to first float the lead mineral and then to float the zinc mineral from the tailings of lead separation . Ammonium dibuyldithiophosphate (ADDP) was used as the collector for the lead mineral and the combination of NaCO3 and DZ to depress the zinc mineral in lead flotation, and CuSO4 as the activator and butyl xanthate as the collector for the zinc mineral in zinc flotation. As a result, the lead was successfully separated from the zinc, and a lead concentrate with a grade of 56.25% and recovery of 93.36% and a zinc concentrate with a grade of 48.56% and recovery of 88.63% were obtained.
    Study on Fractal Characteristics of Pore Structure of Bulk Rock-Ore in  Dump Leaching Based on CT Image
    CHEN Xue-Song, WU Ai-Xiang, YANG Bao-Hua, ZHANG Jie
    2007, 37(10):  75-77+88. 
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    CT (Computer Tomography) technology was used to obtain the sectional images of the upper, middle and lower zones of the solvent leaching column in the leaching process, the self-written Matlab program to estimate the pore fractal dimensions of these images and the main factors leading to the change in the pore structure in the leaching column were analyzed briefly. The results indicate that there is time and spatial variation in the pore structure of the rock-ore bulk media in the dump leaching process, which is related to the transfer and stacking of fine particles under both physical and chemical effects. The pore fractal dimensions decrease with the increase of height before the leaching but increases with the increase of height after the leaching; and the sectional fractal dimensions of the same zone will increase after the leaching when compared with before the leaching, with the increase extent in the lower zone being 19 times that in the upper zone.
    Grade Modeling Based on Three-Dimension Robust Kriging Method
    ZHOU Zhi-Yong, CHEN Jian-Hong, ZHANG Tao, 欧Yang-Hai-鸥 , WANG Bin
    2007, 37(10):  78-80+96. 
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    In view that the traditional test formula of variogram function is sensitive to specificity values and the deflection from distribution assumption, robust statistics method and simplex fitting arithmetic for the test variogram function under three dimension condition are introduced. Through the analysis of the variogram function of the composite sample and mineraization space, the anisotropy characteristic of model data is determined and the corresponding data searching and estimation method for lithology are used. Based on this, the grade model of the iron element of a mine is established by 3D block modeling and robust Kriging method. The comparison of the estimation results and the real deposit condition has proved the accuracy of the model.
    Forecast of Land Utilization Space Structural Evolution in Mine Area Based on Improved CA
    WANG Yan, YAO Ji-Li, SONG Zhen-Bai
    2007, 37(10):  81-83+100. 
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    The land utilization space structure is based the remote sensing images of the mine area in 2002 and in 2006 and on this base, the land utilization space structures are classified into five types, namely, not destroyed, destroyed but reclaimed, destroyed and to be reclaimed, to be destroyed and reclaimed and other. In view of the deficiency in CA (cellular automata), a CA method for mine area that is based on space dynamic data mining and random forecast is proposed, thus establishing an operable CA forecast method for the forecast and simulation of discrete status attribute. It is used to forecast the land utilization space structure of a mine area in 2010. It is demonstrated by the real case that the method is both feasible and effective and its forecast results can be used as accurate and reliable data for the land use plan of mine area.
    Calculation Method for Mining Loss and Ore Dilution Based on CMS Precision Survey
    LUO Zhou-Quan, ZHANG Bao, LIU Xiao-Ming, YANG Cheng-Xiang
    2007, 37(10):  84-88. 
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    Mining loss rate and ore dilution rate are important indexes characterizing the mining technology and management level of a mining enterprise. In view of the practical problems of large amount of work, difficult operation and inaccurate measured data in the conventional dilution and loss measurement, a new calculation method for mining dilution and loss based on CMS precision survey is proposed. The working principle of CMS and its survey process for the cavity are described and the concrete method of calculating the mining dilution and loss based on CMS survey is elucidated. With the precision survey of the cavity in Dongguashan Copper Mine as the real case, Surpac software for 3D design of mine was used to create the 3D models for the cavity, the design unit of stope and its bottom structure. Through the Boolean operation between the models, the accurate data of the real boundary and volume of the mined-out area, and the over-excavated amount, under-excavated amount and the remaining reserve in the cavity were obtained so that the mining dilution rate and loss rate were calculated accurately.
    Test on Dynamic Replacement for Main Plant Building in Sijiaying Iron Mine's Concentrator
    FU Zhen-Guo, DONG Zhong-Fei, FU Ya-Xin
    2007, 37(10):  89-91+96. 
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    Dynamic replacement method is one of the effective ways to treat the foundation. However, up to now there hasn't a set of ripe design method that can be used in the dynamic compaction design. Therefore, field test-determination has become the main means to select the process parameters for dynamic replacement. For this, dynamic compaction test is made in the main plant building in Sijiaying Iron Mine's concentrator. The curves of the relationship between the compaction number, densified area thickness and density are determined. Based on the test-obtained parameters, the dynamic compaction design and construction of the foundation are made.
    Development of Fixed Type Hydraulic Crusher and Its Application in Mines
    LUO Ming, WANG Xing-Rong, HAO Qi-Chang
    2007, 37(10):  92-96. 
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    In open-pit mining, it is a common practice to use a blasting method to blast off the ore from the rockmass, which is then transported to a crusher plant for a primary crushing after the classification by a grate grizzly. Due to the blast-related causes, the large fragments of ore   sometimes can not pass the grizzly, leading to the interruption of the crushing process. In underground mining, large fragments of ore can also be produced, which may block the ore-pass opening, sluice screens or various grate grizzlies, thus seriously affecting the normal production. It is right for solving such problems that the fixed type hydraulic crusher is developed, which can also be used in underground mines as an new efficient secondary crushing machine.
    Modelling of Ore Reserve Estimation System Based on UML
    LI Ming, WANG Shan-Dong, CHEN Pei-Fu
    2007, 37(10):  97-100. 
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    UML is a standard language in software analysis design, which is characterized by strong expression capability and can be used in the whole process of software analysis, design and realization. The paper presents briefly UML technology and its common framework for the development of utilities, uses it to model the ore reserve estimation system and describes the development and analysis process for the reserve estimation system using UML.
    Development and Industrial Test of Tilting Narrow Upflow Spiral Classifier
    CHEN Jia-Dong, HUANG Yun-Ping, FU Wen-Bin, LIAO Jia, WAN Xiao-Jin
    2007, 37(10):  101-103+109. 
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    The tilting narrow upflow classifier can not form a gravity flow of the feed when used in close circuit with grinding mill due to its great height and requires power for pumping. In view of this, new classification equipment is developed- tilting narrow upflow spiral classifier, which is based on the combination of tilting narrow flow classifier and spiral sand lifter. Its industrial test in Gejiu Kafang Concentrator of Yunan Tin Corp. shows that, compared with the site used spiral classifier, tilting narrow upflow spiral classifier can raise the quality efficiency of classification by 3~15 percentage points and reduce the unit energy consumption by 45% while the capacity per unit cost is 2.14 times that of spiral classifier.
    Study on Ball Movement Law in Planetary Ball Mill
    SUN Huai-Tao, FANG Ying, WAN Yong-Min
    2007, 37(10):  104-106+136. 
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    The movement law of the grinding balls in planetary ball mill is mainly determined by centrifugal force. Based on the drawing showing the distribution of the centrifugal force acted on the balls at different positions in the mill chamber, the authors analyze the moving trajectory of the balls relative to the chamber and study the effect of the revolution speed, rotation speed and radius of the mill chamber and the size of balls on the ball movement. It is concluded that the improvement of both the revolution and rotation or the adoption of large diameter balls can obviously strengthen the grinding effect, thus providing a theoretical basis for the selection of the operation parameters of planetary bill mill.
    Supervisory System of Grinding Based on MPC Strategy
    JIN Zheng-Hua, CHEN Xi-Song, DONG Fei
    2007, 37(10):  107-109. 
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    In view of the two-stage grinding circuit in a concentrator, the paper analyzes the grinding process and determines the main input and output variables. An automatic monitoring system based on model predictive control (MPC) technology is designed, where the supervisory subsystem uses MPC strategy to on-line optimize the control policy-decision and the regulatory subsystem uses cascade control strategy to keep the process variables at their set values. The industrial application indicates that this control system has good stability and effectiveness.
    Application of RBF Network in Forecast of Element Contents in Geological Samples
    YAN Yu-Sheng, TUO Xian-Guo, YANG Xue-Mei, MU Ke-Liang, LI Zhe
    2007, 37(10):  110-112. 
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    Artificial neural network has self-organization, self-study and non-linear approaching ability, of which RBF (Radial Basis Function) network is a kind of forward network constructed on the basis of function approximation theory. The study of this kind of network equals searching for the optimal fit plane for the training data in high dimensional space. The X ray florescent counting data of Panzhihua certified geological samples are normalized and classified by suing self-organization neural network. OLS algorithm of RBF network is adopted to forecast the Ti element content in the Panzhihua uncertified geological samples and the relative error between the forecast data and those of the chemical analysis is all smaller than 0.5%, an ideal result.
    Investigation on Ecological Rucksacks in Dong Anshan Iron Open-pit Mine
    GU Xiao-Wei, DING Yi, WANG Qing, WANG Jun, YU Tian-Liang
    2007, 37(10):  113-115+118. 
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    Ecological rucksack fully reveals from the input end the impact of product manufacturing process on the natural resource consumption and the ecological environment, and is one of the main indicators that must be measured, monitored and controlled for the solution of ecological environment problems from the source. With Donganshan Iron Open-Pit Mine as the investigation object, detailed calculation and analysis are made of its ecological rucksack from 1995 to 2005 and suggestions are also made on alleviating the ecological rucksack of the mine. The research achievement will be of great practical significance to the quantitative research on the ecological pressure due to mineral resource exploitation, the calculation of the ecological rucksack of iron and steel products and the calculation of the indirect input related to the imported China steel products by other countries.
    Theoretical analysis of Index of Mining Subsidence-Caused Damage on Cultivated Land
    ZHANG Hong-Zhen, CHA Jian-Feng, YIN Tie-Cheng
    2007, 37(10):  116-118. 
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    The impact of the continuous ground surface displacement and deformation (subsidence, curvature, horizontal displacement or horizontal deformation) or discontinuous deformation (crack, step or pit) induced by mining-caused subsidence on cultivated land is investigated through theoretical analysis. It is proposed to use the allowable slope for land irrigation, underground water table, accumulated water and discontinuous deformation as the indexes for assessing the damage of mining subsidence on cultivated land, thus providing a basis for the research on the sustainable development of the cultivated land in mine area.
    Giving Priority to People-Core of Safety Management
    XU Guo-Ping
    2007, 37(10):  119-120+127. 
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    Safety is first the human life safety and the purpose of safety work is for people and the responsibility also lies in people. The significance of safety work is discussed from the safety management connotation, safety cultural core and “giving priority to people” concept. It is held that only by persisting in taking the people in the first place can the safety production be realized, and only by realizing the safety production can the viewpoint of “giving the priority to people” be embodied.
    Analysis of Human Factors in Mine Safety Production Management
    LUO Jian-Hua
    2007, 37(10):  121-122. 
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    In combination with real cases, the causes for mine safety accidents are analyzed from the aspects of human consciousness, self-quality, psychosis status, adaptability to the environment and social impact. The human factors in the safety management are studied. On this basis, the preventative measures for safety accidents are proposed.
    Test Research on Copper Separation from Tailing of Magnetic Separation of An Anhui Magnetite Ore
    PENG Hui-Qing, DENG Qiang, 吕Ji-Xia
    2007, 37(10):  123-127. 
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    The tailing from the magnetic separation of an Anhui magnetite ore contains copper and sulfur, which is characterized by low copper grade, fine dissemination copper mineral and high slime content. When it is treated by conventional flotation reagents and flowsheet that consists of copper-sulfur bulk flotation, copper separation from sulfur and middling recirculation in sequence, the obtained copper concentrate will have a grade on only 15.62% and a recovery of only 75.38%. Therefore, self-developed ester type sulfide ore collector PL411 is used in the industrial test with a new process of middling selective grinding-flotation closed circuit, finally obtaining a copper concentrate having a grade and recovery of 22.13% and 81.88% respectively and a sulfur concentrate having a grade and recovery of 46.58% and 78.47% respectively. The test results have laid a foundation for the secondary exploitation of the tailing of an Anhui magnetite ore and will also have some reference to the comprehensive utilization of other similar magnetite ores.
    Preparation of Polysilicate Ferrite Flocculant with Hematite and Its Application
    SHI Ji-Bin, LI Shu-An, ZHAO Cheng-Xian, LIANG Chun-Song
    2007, 37(10):  128-131+136. 
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    Test research was made on the preparation of polysilicate ferrite (PSF) flocculant by the process of acid leaching, catalytic oxidation, hydrolysis and polymerization with low grade hematite, spent sulfuric acid and sodium silicate. The results show that the optimal process conditions include: sulfuric acid concentration of 5～6 mol/L ; liquid-solid ratio of 4∶1, acid leaching temperature of 90 ℃, acid leaching time of 2～3 h, oxygen flowrate of 40 cm3/（min·L）,  Fe/Si mol ratio of 2, pH value of 3 for activating silicate, silicate activating time of 25 min and aging time of 2 h. The resultant PSF was used in treating the waste water from printing and dyeing and was compared with polymerized ferric sulfate (PFS) and polyaluminium chloride (PAC). The results show that at a dosage of 90 mg/L, PSF can remove the turbidity, chroma, SS and CODCr from the waste water by 91.5%, 87.8%, 92.2% and 78.5% respectively, 10, 24, 14 and 18 percentage points higher respectively than those by PFS and PAC at the same dosage.
    Study on Heat-Activation Property of Iron Tailing by Red Mud
    FENG Xiang-Peng, ZHANG Na, SUN Heng-Hu, BAI Xue, NIU Xue-Lian
    2007, 37(10):  132-136. 
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    To improve the activity of iron tailing so as to make it possible to be used in large quality as raw material for cement production, the heat-activation property of iron tailing itself and the effect of red mud on it are studied using the iron tailing of Tong Steel. The results indicate that heat-activation only can not improve the iron tailing activity and it can be notably improved by wet grinding with red mud in a ratio of 1∶1. The test piece of cementation sand made of such iron tailing-red mud mixture (50%) after calcined at 600 ℃ for 2 h can have a 28 d compressive strength of 47.5 MPa, satisfying the requirement of the state standard on 42.5# cement.