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Table of Content

    15 April 2009, Volume 39 Issue 04
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    Progress in the Research and Application of Radon Gas in Ore Prospecting
    LI Xue-Biao, YAO Jin-Qi, YANG Xiang
    2009, 39(04):  1-6+10. 
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    The paper introduces the feasibility of applying radon gas in metal ore prospecting and reviews the previous achievements in metal ore exploration.The analysis indicates that applying the radon gas in metal ore prospecting is an efficient deep-penetration exploration method.Presently, it is mainly used to find concealed gold deposit of fractured structural type, W-Sn-Ta-Nb deposit of granite type and hydrothermal multi-metal deposits.The abnormalities can be positive or negative.The problems in this respect include the lack of study on radon gas source, transportation and abnormality formation mechanism; the inability to judge the ore bearing potentiality of fractured belt or structure; the lack of radon gas abnormity decomposition and reconstruction techniques; and the lack of a radon gas abnormal mode for typical metal deposits.Finally, some research subjects concerning the application of radon gas in metal ore prospecting are proposed.
    On the Construction of Green Mines
    HUANG Jing-Jun
    2009, 39(04):  7-10. 
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    Green mine is a brand-new mine development mode and has been considered as the optimal solution for mine sustainable development.The basic connotation of green mines can be outlined as establishing mine resource-environment integration, giving prominence to ecological garden mines and intensifying the concept of green operation.The necessity and urgency of building green mines are demonstrated from the objective requirements of China's conditions and policies, and of implementing the scientific development perspective and ecological construction.The key links of and suggestion on the green mine construction are put forward.
    Analysis of the Deformation of Stratified Rock Surrounding Deep Tunnels
    WEN Sen, ZHAO Yan-Xi
    2009, 39(04):  11-15. 
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    In the construction of deep tunnel, stratified surrounding rock may crack at some conditions and further become bent, causing severe consequences if the bending deformation is large.The limit stress of conversion from stratified structure to slab-rent structure is derived by limit equilibrium analysis and used to distinguish the bending failure from material failure.Given the randomness of parameters, the state function model for the bending deformation of stratified surrounding rock is constructed and a stochastic FEM model is also constructed by Monte-Carlo method.The analysis of real cases indicates that the two methods have obtained basically the same calculation results and can both calculate the probability of different deformation amounts, giving more scientific results than common deterministic methods can, which can be a reference to other similar engineering study.
    Analysis of Rock Deformation Stability
    LI Hou-恩, SUN Qiang, ZHU Zhi-Gang, HE Wei-Bin, YE Xiao-Ping
    2009, 39(04):  16-19+39. 
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    The deformation stability of rock test system is studied based on rigidity criterion and nonlinear catastrophe theory.The rock deformation stability is dependent on the environment rigidity and the equivalent rigidity of rock.The rock instability occurs at a position after the peak value in the constitutive curve.An increase in the environment rigidity will be beneficial to the system stability and rigid loading will generally not lead to a strong instability-caused destruction.The formula for the deformation value corresponding to the instability position of the test system is found based on the cusp catastrophe model and rigidity criterion.
    Application of Linear Programming Approach in Mining Schedule Planning
    LI Shi-Jie, XU Zhi-Hong
    2009, 39(04):  20-21+25. 
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    In the mining production process, the ore quantities and grades of various stopes are different and it is necessary to schedule the ore mining quantity of each stope so as to meet the ore grade requirement.In a comprehensive consideration of the ore demand and underground engineering conditions, a linear programming model for aiding the mining schedule planning is established.By a combined use of this model and the experience of mine technicians, the mining schedule can be accomplished in a rapid and efficient manner, which lays a good foundation for the modernization of mining enterprises.
    Research on the Law of Ground Subsidence after Stoping Halt
    JU Cheng-Yu, DENG Ka-Zhong
    2009, 39(04):  22-25. 
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    With the speeding-up of the construction of mining cities and mining areas, the lack of land for construction has become increasingly prominent.It is inevitable to utilize caved mined-out areas for the construction of various transport or electrical and communication facilities.The key issue for the structures above the old mined-out area is the residual movement amount of the old mined-out area.The law of subsidence and the rate of subsidence after stoping halt were obtained by analyzing the ground movement data of several mine areas.The mechanism of the ground subsidence speed change after stoping halt was analyzed in consideration of the stress-strain change law of the rock mass overlying the mined-out area.Models for different stages were established and used to forecast the ground subsidence speed and amount after stoping halt, providing a basis for the forecast of residual movement deformation of old mined-out area.
    Study on the Calculation Methods for Tailings Dam Flood Prevention
    WEI Yong, XU Kai-Li, ZHENG Xin
    2009, 39(04):  26-28+31. 
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    The safety and stability of tailing reservoirs are of great importance to the mining production and environmental protection.Based on the practical experience in the projects of tailing reservoirs and hydropower engineering, the calculation methods for protecting tailing dams against flooding are studied.The calculation examples have testified that these calculation methods can be effectively used in the flood prevention of tailing reservoirs, being of great significance to guiding the flood prevention of tailing dams in flood season.
    A Preliminary Study of the Basic Mechanical Properties for Limestone at High Temperature
    LIN Xiang, ZHANG Zhen-Yi
    2009, 39(04):  29-31. 
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    Test was conducted on the mechanical properties of the limestone specimens from an ore district in Jiaozuo, Henan at high temperature to disclose the regularities of their strength and deformation characteristics varying with temperature.The test results show that, with the temperature rises, all their mechanical parameters varied to different extents.Their compression strength rises from the normal temperature to 500 ℃ and decreases from 500 ℃ to 800 ℃ and their elastic modulus rises  from the normal temperature to 500 ℃ and decreases rapidly from 500 ℃ to 800 ℃.
    Analysis of the Extraction Mode for Adjacent Narrow Veins
    QIU Jun-Gang, DU Yun-Long, LIU Fu-An
    2009, 39(04):  32-34. 
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    Adjacent veins in Sizhuang mining area of Jiaojia Gold Mine are often seen to be in parallel arrangement to each other.For them, shallow-hole shrinkage stoping, separate cut-fill method of two veins and filling by wall-cutting had been adopted, achieving no ideal results.Through continuous trial and error by technical personnel in production practice, a flexible and rational stoping method for parallelly-lying adjacent narrow veins that is synchronous stoping method of adjacent veins was devised, where two sets of ore passes and drainage wells are used in combination for ore transport and ventilation, providing a fully new thinking for the efficient mining of parallelly-lying adjacent narrow veins in gold mines.
    Analysis of the Magnetic Buoyancy Force of Non-Magnetic Mineral Particles in MHSS
    GUO Tie-Liang, LI Hai-Bao
    2009, 39(04):  35-39. 
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    The paper analyzes in detail and calculates the magnetic buoyancy force exerted on the non-magnetic mineral particles in the magneto hydro static separation (MHSS) system by means of fluid mechanics and Maxwell electromagnetic equations, and on this basis, derives the resultant force acting on these particles in the magnetic fluid when the magnetic intensity gradient direction is vertically downward.
    Agitation Bioleaching of Low-grade Primary Copper Sulfide Ore under Catalysis Conditions
    ZHANG Wei-Min, GU Shi-Fei, SUN Zhan-Xue
    2009, 39(04):  40-42+49. 
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    Activated carbon，Ag+ and Fe2+ were used as a combined catalyst.The bioleaching effect for low-grade primary copper sulfide ore from Yongping Copper Mine under catalysis conditions was investigated through an agitation leaching test.Good results were achieved and the agitation speed had a great effect on the leaching.At a 240 r/min agitation speed, the 456 h leaching rate of copper reached 83%.Acid-treated solution can replace 9K+S medium as leaching agent, which can achieve a 335 h copper leaching rate of 81.58%, more than 6 percentage points higher than that when 9K+S medium is used.
    Research on the New Flotation Agent Regime for Changba Lead-Zinc Mine
    XIAO Yun
    2009, 39(04):  43-45+59. 
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    To solve the problem of continuous decrease of beneficiation indexes with the transfer from open-pit mining to underground mining of residual ores in Changba Lead-Zinc Mine, and in view of the characteristics of its sulfide-oxide mixed lead-zinc ore, research was made on a new flotation reagent regime adopting sodium sulfide for activating lead oxide, an efficient collector D421 for enhancing lead flotation, and sodium silicate and MP for depressing silica in zinc cleaning.Both its lab and industrial tests gained satisfactory results.Since its use in the production, the beneficiation indexes of this mine have been fully improved, which can bring an over 37 million yuan additional economic benefit per annum.
    Semi-Industrial Test of Bauxite Separation by Cyclone Static Micro-bubble Flotation Column
    WANG Da-Peng, LIU Jiong-Tian, ZHOU Chang-Chun, WU Bin, XIE Ling-Hui
    2009, 39(04):  46-49. 
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    Based on the laboratory test, a cyclone static micro-bubble flotation column was used in the semi-industrial test conducted by diverting the feed stream of industrial flotation machine in a certain Henan Bauxite Concentrator.The test results indicate that the cyclone static micro-bubble flotation column, by a process of one roughing one cleaning, can obtain a bauxite concentrate with a yield of 71.1%, a Al2O3-SiO2 ratio of 10.68 and an Al2O3 recovery of 79.9%.Their comparison with those of the concentrate produced by the site flotation production adopting a process of one roughing, two cleaning, one scavenging and one cleaning-scavenging, shows a basically same aluminum-silicon ratio, a yield increase of 4.1 percentage points and an Al2O3 recovery increase of 3.2 percentage points.
    Improvement of the Lead-Antimony Concentrate Grade of Changpo Concentrator with a New Depressor
    LONG Qiu-Rong, CHEN Jian-Hua, LI Yu-Qiong, WANG Jing-Shuang, WEI Zong-Wu, MU Xiao
    2009, 39(04):  50-52. 
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    GZT, a new organic depressor developed by Guangxi University, was used in the laboratory and industrial tests for reducing the impurity and improving the grade of Changpo Concentrator's lead-antimony.The result proved that GZT is a very efficient selective depressor for sulfide ores.Its application in the industrial test raised the lead + antimony grade of the concentrate by 9.61 percentage points, and reduced the zinc content of the concentrate by 2.97 percentage points, raised the lead and antimony recoveries by 4.75 and 4.19 percentage points respectively, solving the problem of low grade of the lead-antimony concentrate of Changpo Concentrator.
    Technical Plan for the New Zhudongkuang Magnetite Concentrator of Bayan Obo Iron Mine, BaoSteel
    JI Zhi-Yong, LIU Ya-Feng
    2009, 39(04):  53-55. 
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    To reduce the production cost, improve the economic benefit and reduce the pollution to the environment of Baotou urban area, BaoSteel decided to build a new Zhudongkuang magnetite concentrator of Bayan Obo Mine that is capable of treating annually 8 million t run-of-mine ore and producing 3 million t iron concentrate.The technical process plan for this new concentrator is described, including its crushing process, staged grinding-staged low intensity magnetic separation (LIMS) process and reverse flotation for the LIMS concentrate.
    Research on the Optimization of Beneficiation Process for a Gold-Copper Mine
    ZHANG Yue
    2009, 39(04):  56-59. 
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    To determine the rational process flowsheet plan for its new 7 000 t/d concentrator, a gold-copper mine conducted a research to optimize its original 900 t/d concentrator's process flowsheet.The result shows that it is better to eliminate the original ore-washing operation; to simplify the original multi-stage grinding-flotation process into one stage grinding-flotation; to use a composite collector to improve the flotation recovery; and to replace the single gravity separation for the retreatment of flotation tailings by gravity separation-regrinding-flotation process or by gravity separation-regrinding-cyanide leaching process. Gold-copper ore, Optimization of beneficiation process|Grinding-flotation process|Composite
    Study on the Beneficiability of a Low-grade Molybdenum Polymetallic Ore
    LIU Zhi-Lin, XU Fang
    2009, 39(04):  60-61+113. 
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    A laboratory test was made to identify the beneficiability of a low grade molybdenum polymetallic ore .The results show that molybdenite is the main recoverable metal mineral and bismuthinite and scheelite are the associated metal minerals recoverable.A full flotation flowsheet consisting of molybdenum-bismuth bulk flotation and separation, and scheelite separation from the bulk flotation tailings was adopted.The closed-circuit test gained a molybdenum concentrate grading 52.42% at a 95.11% recovery, a bismuth concentrate grading 15.16% at a 53.06% recovery and a scheelite concentrate grading 30.5% at a 36.60% recovery.The study results provide a technical basis necessary for the future resource exploitation.
    Study on the Radioactive Level of Iron Ore Imported via Beilun Port
    RONG De-Fu, LIU Yu-Fen, CHEN He-Hai, ZHOU Qiang
    2009, 39(04):  62-64+69. 
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    The radioactive pollution of iron ore imported via Beilun Port was studied by measuring the imported iron ore deposited at Beilun Port.The result indicates that the average annual effective dose equivalent of γ irradiation is 0.15 mSv/a  for the nearby residents of the imported iron ore yard and 0.21 mSv/a to the workers involved, which both are below the national standard for building materials.Its radon pollution is low, near to the environment background value.
    Measurement of the Thermal Conductivity Coefficient of Sulfide Ore by Hot-wire Method
    MAO Dan, CHEN Yuan-Jiang, WU Chao
    2009, 39(04):  65-69. 
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    A test device for measuring the thermal conductivity of materials by hot-wire method was designed and used to test the thermal conductivity coefficient of a bulk sulfide ore of six size fractions 0~1，1~2，2~4，4~6，6~8，8~10 mm at 25～120 ℃.The test results show the thermal conductivity complexity and nonlinearity of bulk materials: the thermal conductivity coefficients of all size fractions slowly increase with the temperature rise in basically a linear relation within the test temperature scope, and at the same temperature, their relation curve with particle size is on the whole similar to a parabola.It is seen from the error analysis the total error of each measurement is within 4%, which is mainly due to the prediction equation for thermal conductivity coefficient, the idealized processing of hot-wire resistance and the inherent error of current and temperature measuring instrument, where resistance and current contribute the most.
    Determination of the Sulfur Content in Iron Ores
    SUN Li-Jun, CHEN Ping, 吕Xian-Jun , DU Fei-Fei
    2009, 39(04):  70-73+90. 
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    The paper summarizes five methods commonly used for determining the sulfur content in iron ores, and elaborates their applicable scope and determination principles.Based on this, the work principle, work process, cautions in use and features of ZDL8 automatic sulfur analyzer are presented in detail and the T testing has proved the reliability of this analyzer.
    Structural Ore-controlling Characteristic and Prospecting Direction in Chengchao Iron Deposit in Southeast Hubei
    WANG Lei, HU Ming-An, ZHANG Wang-Sheng, JI Ao, MIN Hou-Lu, YANG Zhen, XIA Jin-Long
    2009, 39(04):  74-77. 
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    Chengchao iron mine is a typical skarn deposit in the southeast of Hubei province.Ore-controlling structures are mainly characterized by the superposition of dynamic thermal contact metamorphic structure，contact zone structure and various faults and fissures.The orebodies mainly occur in the steep-to-gentle transition section of the contact plane between granite and wall rock, and lie in the synclinal trough of the near N-S strike to the side of magma rock.From the deep extension of the contact plane between granite and wall rock, we conclude that both sides along the “ridge” of the near N-S strike between E14 to E0 prospecting lines and the section west of W27 prospecting line, especially the section between W49 to W59 prospecting lines, are provided with the structural and stratigraphic conditions favorable for mineralization, and have good exploration prospects.
    Study on the Law of Mineralization and Prospecting Direction in Fengjiayu Iron Ore Area
    CAI Guo-Qing
    2009, 39(04):  78-80+108. 
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    Studies show that the ore-controlling modes in Fengjiayu iron ore area include fold texture and ductile-brittle shear fracture composite texture types.The first period folds have controlled the overall distribution and size of orebodies while the second period folds have made the orebody morphology more complex.The composite ore-controlling by folds and ductile-brittle fracture mainly exhibits as such that the shearing has made the orebody regional distribution strongly oriented and the drag folds formed in the shearing process have re-enriched the orebodies.According to this knowledge, industrial orebodies were found by the drilling engineering around Mazikeng mining area, a breakthrough in ore prospecting.
    Application of High Precision Magnetic Survey in the Exploration of a Lead-zinc Deposit
    ZHANG Wei-Qing, ZHANG Zuo-Lun, ZHANG Lu-Xin, WANG Yong-Bin, ZENG Qing-Dong, Ye-Jie, YU Chang-Ming, LIU Hong-Tao, CHEN Wei-Jun
    2009, 39(04):  81-83+94. 
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    The simple magnetic survey indicated that the ore-bodies outcropped in the target area had obvious magnetic anomaly.In order to effectively instruct the prospecting work in the target area, we used handheld HC-95a ground helium optically-pumped magnetometer in combination with high precision GPS survey in the ground high precision magnetic survey for buried ore-bodies.The survey involving 19 survey lines with a total length of 23 200 m and 1 179 measuring points was carried out, and three 800~1 800 m long belts of high magnetic anomalies were defined.One anomaly was found at the contact belt between the intrusive rock and stratum, where two mineralization outcrops on the ground surface were determined to have mineralization anomalies.Anomalies 2 and 3 were of large size and had no mineralization outcrop, and a further work should be made to find the cause for the magnetic anomaly.
    Ore Formation Causes and Reserve Estimation of Leigongdi Tungsten Deposit
    GAN Zheng-Ru, YANG Chun-Guang
    2009, 39(04):  84-86. 
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    Ore resource reserve decides a mine's existence, especially old mines with resource risk.Looking for replacing resource and enlarging the prospective reserve is a very important and also very difficult task for many foreign and domestic mines.The paper makes an analysis of the geological background and deposit enrichment characters in Leigongdi and an instructive exploration of the prospective tungsten ore reserve in this area.
    Analytic Prediction of the Stress and Displacement Field of Roadway Wallrock Based on Visco-Elastic Theory
    FU Jian-Jun, LIU Quan-Sheng, QIN Zheng-Gang, SHI Kai
    2009, 39(04):  87-90. 
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    The mathematical expression of wallrock stress field and displacement filed considering time-sensitivity is established based on visco-elastic theory by applying analytical method and Laplace transformation.The analytical solution of the wall rock stress field and displacement field under the highly stressed bolting support is deduced by the displacement and stress boundary conditions.The engineering practice shows that during tunneling, the bolt-shotcreting can effectively control the wallrock stability and the change in the stress field and displacement field of supported wallrock tends to become stable with time, verifying theoretically the rationality and science of the analytical solution.
    Research on the Compilation of Digital Mineral Survey Results Based on iExploration-EM
    GONG Guo-Qing, LIU Xiu-Guo, NI Ping-Ze
    2009, 39(04):  91-94. 
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    As a subsystem of the Digital Geology Survey System (DGSS) developed by China Geological Survey, iExploration-Estimation and Modeling system (iExploration-EM) has realized an integrated processing of mineral survey data involved in mineral survey data management, ore-body delineation, reserve estimation, assistant generation of geological survey maps and ore-body modeling.The paper presents the technical advantages and main functional characteristics in iExploration-EM, and discusses the process of reserve estimation of digital mineral resource survey and assistant generation of geological survey maps by iExploration-EM and its perspective in digital mineral surveys.
    Application of 3D Deposit Model in Manjiazhai Sn-Zn Polymetallic Deposit
    JIANG Yuan, LI Feng, JIA Fu-Ju
    2009, 39(04):  95-97. 
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    Mining software Surpac that has spatial positioning and analysis functions was used in the comparison of the stripping ratios of six open-pit mining plans based on deposit model evaluation, current surface modeling and open-pit design modeling.It is concluded that the stripping ratio is the least when the lowest mining level is 880 m in the open-pit mining design of Manjiazhai Sn-Zn polymetallic deposit.
    Research and Application of Spatial Databases Data Model-case of Balkhash-Junggar
    REN Xiao-Li, CHEN Chuan
    2009, 39(04):  98-101. 
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    The spatial database is both the core and the key to GIS while the data model is the premise and the foundation for a spatial database.Therefore, it is especially important to design and establish the data model for spatial database.The paper studies the conceptual model, logistic model based on the spatial databases, defines the logical relationships between the elements composing the digital geological map, and describes the detailed construction of the physical model of the cross-border geological map of Balkhash-Junggar regions by a combined use of 2003 Visio and ArcGIS CASE tool, by which the spatial data and attribute data are effectively converged and the object-oriented digital geological map data model is established.
    Study on the Integrated and Visualization System of Mineral Reserves Estimation|Tabling and Mapping
    CHEN Guo-Xu, TIAN Yi-Ping, LIU Gang, LIU Yuan-Yuan, QI Guang
    2009, 39(04):  102-105+117. 
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    Fully computer-aided and automatic mineral reserves estimation and mapping is the development trend of the informatization of geological surveying and mineral resource exploration, and also an important link in promoting the building of digital mines.In light of the problems such as rapid dynamic reserve estimation, tabling and mapping and the real time updating in the estimation of mineral resources, with traditional mineral reserves vertical section estimation method as the entry point, discussion is made on the integration and visualization workflow of mineral reserves estimation, tabling and mapping and the key techniques in the system.The system realization process is described with a real mine case.
    Discussion on the Safty Monitoring of Tailing Reservoir Based on  3S Integrated Technology
    ZHU Jun-Xing, XU Wei, XU Yong-Guo, HUA Yue
    2009, 39(04):  106-108. 
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    GIS, RS and GPS are integrated and used in monitoring the tailing reservoir safety.Remote sensing and global positioning system are adopted to collect the basic data for the tailing reservoir and the global positioning system is used in the collection, storage, processing and database building for the information of the tailing reservoir and surrounding environment to realize the query, analysis, dynamic management and information output of information, thus providing a basis for monitoring the tailing reservoir safety, which is important practical significance to prevent or reduce the accident damage.
    3D Reconstruction for X-ray CT Sectional Series Images of Cracks within Rocks
    ZHANG Fei, JIANG Jun-Zhou, CHEN Shi-Jiang
    2009, 39(04):  109-113. 
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    Ostu method is used to perform the segmentation on the pore and fissure images in microscopic rock X-ray CT sectional images, by which the pore and fissure distributions in 2D X-ray CT sectional images are obtained.On this basis, Marching Cube algorithm is adopted to conduct a 3D reconstruction of successive CT sectional images, realizing the visualization of the crack distribution at the initiation stage of a rock loading test.The comparison of 2D segmentation images with those of 3D reconstruction shows that 3D reconstructed images has eliminated the restriction that the crack distribution can only be reflected from a planer surface in 2D segmented images and therefore, can reflect the crack spatial distribution in rock loading process in a more intuitive|true and accurate manner.
    Study on the Environmental Recognition System for Underground Remote Control LHD
    LI Hui, LI Xiao-Bing, ZHANG Jin-Feng, LIANG Shao-Bo
    2009, 39(04):  114-117. 
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    A new recognition method for remote control load-haul-dump is advanced in the paper, which is based on available environment-identification methods and makes use of ultrasonic distance measuring, multi-sensor data fusion and power drag principle.The PIC single chip is made to be able to communicate with a PC machine by level translators.The recognition system is capable of real-time data acquisition and processing to acquire the precise information of environment or obstacles, which will assist the control operations such as obstacle avoidance, safe driving, clusters optimization and navigation or positioning, making the remote control room and on-board computer system work more synergistically and effectively.The new recognition method has achieved good effects as verified by the results of Matlab programming and LHD simulative driving.
    Analysis and Research of the Hydraulic System of Multi-Functional Crusher Cleaner
    SHANG Qi-Wen, JI Wan-Jian, HAO Qi-Chang
    2009, 39(04):  118-120+125. 
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    The paper presents briefly the hydraulic system of multi-functional crusher cleaner, makes detailed theoretical analysis of the mechanism of three hydraulic system plans (throttle-governor system with fixed displacement dual pump, constant flux control system with fixed displacement pump and load-sensitive control system with variable pump), and describes the reasons for selecting the load-sensitive variable pump control system for multi-functional crusher cleaner.
    Wireless Localization Technique and Its Application in Underground Mines
    WANG Xue-Li, LU Cai-Wu, GU Qing-Hua, LIU Zi-Shi
    2009, 39(04):  121-125. 
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    In light of the need of underground personal and equipment localization and the difficult rescue in underground mine accidents, the paper makes a systematic analysis and study of the current personal localization techniques for underground mines, presents the personal localization systems for underground mines based on RFID, ZigBee, WIFI and UWB technologies, and proposes the method using wireless localization technology to realize the underground personal localization and its development orientation.
    Fuzzy Control System for Grinding Mill Feed Quantity Based on PLC and WinCC
    LI Shi-Guo, WANG He
    2009, 39(04):  126-128. 
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    In light of the primary grinding circuit of a concentrator, a fuzzy control system for grinding mill feed quantity based on S7-300 PLC and Wincc was designed.The system adopts a set value fuzzy control and fuzzy PID control algorithms to set the mill feed quantity and timely set KP , TI , TD parameters, well realizing the stable control of the feed quantity for the primary grinding mills of this concentrator.
    3D Dynamic Simulation of Underground Mine Ventilation System
    HOU Wei, SONG Xian-Feng, LI Cheng, TAN Hai-Qiao
    2009, 39(04):  129-131+171. 
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    Evaluation of Sustainable Development Policy of Resource-based City：With Huangshi City as the Study Case
    SHI Xiu-Hua, ZHANG Feng
    2009, 39(04):  132-135. 
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    The paper highlights the main contents and application scope of analytic hierarchy process (AHP) and fuzzy comprehensive evaluation (FCE), and based on this, establishes AHP-FCE method.According to its requirement, the index system of sustainable development policy of resource-based Huangshi City is designed and the 2003-2006 support policies for the sustainable development policies of Huangshi City and its effect are evaluated.
    Analysis and Countermeasures for the Safety of Ventilation System of Wenzhou Alum Mines in Middle and Later Operation Periods
    LU Jian-Jun
    2009, 39(04):  136-138+142. 
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    The middle and later periods are a special time for alum mines, when the mine ventilation system will face more complex problems.In light of the production practice of mines, the status quo and problems of underground ventilation system in alum mines are analyzed.Measures for solving the safety problems in the underground ventilation system of Wenzhou alum mines in middle and later periods are proposed from the optimization technology and safety management of ventilation system, aiming to reduce the safety accidents and ensure the smooth operation of underground mining.
    Experimental Study on the Photocatalytic Degradation of DDNP Waste Water by TiO2/SiO2 Composite Film
    JIA Wei-Xiao, LI Liao-Sha
    2009, 39(04):  139-142. 
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    TiO2/SiO2 composite film made by liquid deposition on the surface of coal fuse sintered filter material was used to study its photocatalytic degradation effect for DNNP waste water from a Huannan chemical plant.The test result achieved a decoloration rate and CODCr decrease of 75.54% and 61.51% respectively at one hour degradation with TiO2/SiO2 composite film with also lighting and aeration, where the waste water (CODCr, 318 mg/L and chroma, 3 750 times) was first diluted by 20 times to gain an initial pH of 3, into which oxydol was added at a dosage that was 0.9% of the waste water volume.The result was ideal.
    Preparation of Rectorite-Chitosan Sorbent and Its Absorption for Zinc
    LI Ai-Yang, LI Da-Sen, LI An-Wu
    2009, 39(04):  143-145+153. 
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    Rectorite-chitosan composite sorbent was prepared by impregnation method, which was used in the adsorption test for Zn2+ containing solution.Based on the test, it was used to treat the practical electroplating waste water containing zinc.The result shows that the composite sorbent has a high adsorption rate when the mass ratio of chitosan to rectorite was 0.04 and the deacetylation degree of chitosan was 90%.At a Zn2+concentration of the solution of lower than 100 mg/L, a pH value of 7, a composite sorbent dosage of 3.0 g/L and an adsorption time of 40 min, the composite sorbent can have a Zn2+ adsorption rate of higher than 99%，with the treated water conforming to the requirements in the state standard for Class A sewage discharge.
    Bioremediation Technology for Heavy-Metal Contaminated Soil
    ZHANG Yu-Xiu, YU Shuai, WEN Zhen-Song, BAI Liang, LI Xia
    2009, 39(04):  146-149. 
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    The paper reviews the progress in the research of bioremediation technology for heavy-metal contaminated soil, including plant remediation, microbe remediation and plant-microbe associated remediation, and based on this, proposes the future development orientation of the research in bioremediation technology.
    Research Progress in Bentonite Modification
    YANG Xiu-Hong, YUAN Jiang, YANG Xiu-Min, ZHANG Ying-Chun
    2009, 39(04):  150-153. 
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    The paper summarizes the structure and properties of natural bentonite, presents the progress in the research of its modification by sintering, sodium treatment, acid treatment, intercalation and organic method, and proposes the direction of the future research of bentonite modification.
    Harms and Resource-like Treatment of the Solid Wastes from Metal Mines
    CHEN Hua-Jun, LIU Quan-Jun
    2009, 39(04):  154-156+167. 
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    The paper analyzes the sources of the solid wastes of metal mines, discusses its harms and presents the ways to treat them as a resource, including recovering valuable metals from them, making new materials of them, and filling the underground mined areas with them.
    Comprehensive Recovery of Lead-Zinc-Sulfur from A Guizhou Concentrator's Lead-Zinc Tailings
    FENG Zhong-Wei, NING Fa-Tian, 蓝Gui-Mi , DONG Ming-Chuan
    2009, 39(04):  157-160+164. 
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    The tailings discarded by a certain lead-zinc concentrator in Guizhou are characterized by high oxidation of lead-zinc minerals, fine particle size, serious sliming and difficult dressing.A technical process consisting of preferential-bulk flotation of sulfide minerals, zinc-sulfur separation of bulk flotation concentrate and sulfuration-flotation of oxidized lead minerals was adopted and gained good test indexes, and then used in production, which effectively and comprehensively recovered the lead, zinc and sulfur minerals that would have otherwise been lost, with the lead grade and recovery of oxidized lead concentrate being 48.56% and 85.38%.
    Study on the Utilization as Resource of Tailings from a Shaanxi Copper Mine
    XIE Jian-Hong, CUI Chang-Zheng, WAN He
    2009, 39(04):  161-164. 
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    The utilization as resource of tailings from a Shaanxi copper mine was studied, including their re-concentration and the brick-making by the re-concentration tailings.The result shows that the pre-concentration of the tailings via spiral chute can discard tailings of an 85.53% yield, and a qualified copper concentrate grading 15.86% at an 83.24% recovery and a qualified sulfur concentrate grading 41.68% at a 85.96% recovery can be obtained by grinding and sequential flotation of copper and sulfur of the pre-concentrated concentrate.The total tailings of re-concentration, when mixed with cement and local construction-use sand, can be made into MU10 unfired bricks.
    Experiment and Application of HAS Tailing Solidified Agent
    ZHANG Da-Jie, ZHANG Fa-Wen, SUN Qi, HOU Hao-Bo
    2009, 39(04):  165-167. 
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    HAS Tailing Solidified agent is a fly-slag cementing materials which blast furnace slag is raw materials.Total tail is solidified by different HAS solidified agent of different gypsum content.Compressive strength was studied to evaluate the quality of the solidified tail and the cement is compared to HAS solidified agent.Experimental and in-site result showed that HAS solidified agent can surpass the cement on the strength of solidified tail and the cost of HAS solidified agent is lower than cement.HAS solidified agent is an overflow tailing solidified agent.
    Preparation of Dry-Pressed Unfired Bricks Made of Iron Tailings
    HE Ting-Shu, WANG Pan-Long, CHEN Xiang-Jun, HUANG Ru-Jie
    2009, 39(04):  168-171. 
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    MU15 dry-pressed burning-free bricks were made with iron tailings from Shaanxi as the main raw material, and by addition of a small amount of cement and a proper amount of river sands.The effect of the mass ratio of iron tailings to river sand, cement amount, water addition for mixing, forming pressure and chemical additives on their compression strength was investigated.The results indicate that their 28 d compression strength can reach 16.4 MPa when they are made of iron tailings at such conditions: a forming pressure of 15 MPa, a mass ratio of iron tailings to river sand of 1.25∶1.00, a cement amount accounting for 10% of the total dry solids, a water addition for mixing amounting to 8% of the total dry solids, and a naphthalene-based super-plasticizer content and a sodium gluconate content of 0.8% and 0.03% of the cement dosage respectively.Their other performance indexes are in conformity with the requirements in JC/T 422-2007 standard “Unfired Bricks Made of Tailings”.
    Effect of Magnesium Hydroxide Whiskers on PVC's Material Mechanical Properties
    JIANG Yu-Zhi, HAN Yue-Xin, YIN Wan-Zhong
    2009, 39(04):  172-174+177. 
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    Mg(OH)2 whiskers that are surface-modified by sodium stearate and potassium oleate and PVC plastics were made into an Mg(OH)2 whiskers/PVC composite.The effect of Mg(OH)2 whiskers' content and distribution on PVC's mechanical properties were studied.The results show that surface-modified Mg(OH)2 whiskers can be distributed homogeneously in PVC plastic; when the Mg(OH)2 whiskers amount to 30% of the composite，the PVC composite has the best mechanical properties，with the elastic modulus improved by 41.18% compared with that of pure PVC plastics, and reaching 0.24 GPa.The main reason for this is that Mg(OH)2 whiskers that are uniformly distributed assume the load transfer in the composite.