Table of Content

15 December 2009, Volume 39 Issue 12

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Research on the Influencing Factors of Development of Tibet Mining Industry and Its Countermeasures

LUO Yi-Chong

2009, 39(12):  1-4+24. 

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The basic conditions which Tibet is completely satisfied to develop advantageous mining industry are discussed from the aspects of mineral resources, economic policies, industrial structure and the needs of economic growth. And some bottleneck factors of restricting the development of Tibet advantageous mining industry in Tibet were analyzed, such as natural environment, ideology, geological work, infrastructure, distribution of benefits, environmental protection, social collaboration and so on. The methods and countermeasures for solving the bottleneck restricting factors were proposed. And it was an inevitable choice of the green and efficient mineral resources exploitation technologies to promote the virtuous development of mining industry and support the fast economic growth of Tibet.

Research Progress on Mechanism of Spontaneous Combustion for Sulfide Ores and the Control Techniques

SUN Hao, YANG Fu-Qiang, WU Chao, LI Zi-Jun, LU Yu-Peng

2009, 39(12):  5-10+14. 

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Based on the present research situation of spontaneous combustion for sulfide ores, the oxidation and self-heating mechanism were introduced systematically, including the physical mechanism, chemical thermodynamic mechanism, electrochemical mechanism, and bio-oxidation mechanism. The prediction and forecast techniques for spontaneous combustion of sulfide ores were put forward, such as spontaneous combustion tendency test, integrating all the relevant factors evaluation, statistic and empirical method, mathematical model prediction, forecast methods of significant gas analysis and temperature measuring. Moreover, the existing integrated control techniques for spontaneous combustion of sulfide ores were also summarized. In the end, the prospects over the future research on mechanism and control measures for spontaneous combustion of sulfide ores were set forth.

The Status Quo and Developing Trend of Brazilian Iron Ore Industry

FANG Zong-Wang

2009, 39(12):  11-14. 

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The latest status quo of iron ore resources and iron ore production in Brazil were present. And in combination with the situation of M&A cases in Brazilian iron ore industry in recent years, the competition of Brazilian iron ore industry was analyzed, and the developing trend of Brazilian iron ore industry was predicted.

Study on Fault's Influence to Goaf in Underground Mining Transferring from Open-Pit in Complex Situation

SHI Xiu-Zhi, HUANG Gang-Hai, ZHANG Shu

2009, 39(12):  15-19+60. 

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For the complex situation of Tonglvshan No.1 orebody in underground mining transferring from open-pit，influence of fault in hanging rock was analyzed by FLAC^3D，in order to guide on-site construction.One model with fault and another model without fault were established respectively.Two models took the same form of excavation：stope 1 and stope 2，leaving column between two stopes in order to support the roofs.The results of excavation by both of methods are compared through stress and displacement，and the research indicates that the fault makes the situation of mining worse，mainly showing two aspects: ①fault weakens the integrity and continuity of hanging rock，and makes the compressive stress on stope-boundary increase by 0.01~0.45 MPa；②when the thickness of pillar is large，fault seldom influences stope 1，but makes large influence to stope 2，causing the increasing subsidence of the roof，and showing that the roof of stope 2 rotates around the top of the column.When the thickness of pillar h≤16 m，fault makes influence to both of stopes，leading to their roofs' displacement increase conspicuously，and showing that both of stopes' roofs rotate around the top of left-boundary in stope 1.

Research on Expansive Pressure Arch Theory and Rock Pillar Load about the Activity of the Covered Rock Mass in Close Laneways

QIN Le-Yao, LIU Chang-Wu, FANG Yan-Qiang

2009, 39(12):  20-24. 

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With the constant development of mining and other geotechnical engineering，more and more underground engineering will relate to the design，construction and maintenance of the close laneways.Deformation and failure law of the covered rock mass in the close laneways and the calculating of rock pillar load among laneways become one of the hot topics in the field of underground engineering.Based on study on the stress distribution of single laneway with limit equilibrium area，combining with the pressure arch theory about the activity of the covered rock mass in laneway，this paper systematically studies the stress distribution in close laneways，proposes the expansive pressure arch theory about the activity of the covered rock mass in close laneways，gives calculating formula of rock pillar loads among laneways，and points out technical measures to avoid the chain failure of the rock pillar in close laneways.

Experimental Research on Monitoring Mining Subsidence by D-InSAR Technique

DENG Ka-Zhong, YAO Ning, LU Zheng, FAN Hong-Dong

2009, 39(12):  25-27+120. 

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Based on ERS1/2 images，and in view of the No.22 Mining Area of Peicheng Mine，DORIS were chosen for D-InSAR (Differential Interferometric Synthetic Aperture Radar) process to monitor the mining subsidence in Er'er mining area of Peicheng by the Doris software in this paper，and the subsidence values were obtained.After compared with the surface observation data，the relationship between the surface observation data and the results obtained by D-InSAR technique were established.According to the formulations，the subsidence values obtained by D-InSAR technique were modified，the land subsidence values closed with the surface observation data were calculated，and this proves that using D-InSAR technique to monitor the mining subsidence are very reliable.

Processing Technology of the Underground Residual Mined-out Area and its Application

WU Jian-Xiang, SUN Guo-Quan

2009, 39(12):  28-31+49. 

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The treatment of residual mined-out areas is a focal point of mine security management in recent years.Since open pit mining method is a simple process with simple equipment，it is a common method for small and medium sized mines.But the residual mining-out area is the major risk in mine safety.For different environment in different mined-out area，how to safely and efficiently handle and recover the residual ores without disturbing the normal production will bring huge mine safety and production efficiency.In this paper，the technology of recovering the top in turn and operation step by step is a successful solution of the security issues that troubled mine.

Study on the Stability of Goaf in Wuji Iron Mine (Southern Section)and its Handling Measures

LI Tong-Peng, WANG Xiang-Gui

2009, 39(12):  32-34. 

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In view of the occurrence features of Wuji iron ore, the endangers, main reasons and influencing factors of goaf caving from the stress change have been analyzed.A handling method with high concentration whole-tailing cemented filling was proposed with characteristics of high filling slurry concentration and high tailing utilization, thus providing a theoretical basis for handling the golf and making full use of mine wastes. 

The Factors Influencing the Seepage Field of Tailing Dam and the Measures Lowering the Seepage Line

QI Qing-Lan, ZHANG Li-Ting, GU Fang, ZHOU Guo-Bin

2009, 39(12):  35-37+102. 

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A qualitative analysis was made on the factors affected the seepage line of tailing dam by FEM, which contained the drainage capacity of the initial dam, the dry beach length of fill dam, the ratio of osmotic coefficient for the layers in dam and the slope downstream of the fill dam factors.And the measures reducing seepage line are deduced.The technical basis is supplied for the design, construction and operation of the tailing dam, which is of significance for the safety operation of the tailing dam.

Optimization of Bolt-Mesh-Anchor Support Parameter in Kinetic Pressure Tunnel of Cuijiazhai Mine

TIAN Duo, LI Wan-Ming-2, ZHAO Qi-Feng

2009, 39(12):  38-40+169. 

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Abstract  Based on the field investigation, the problems of roadways support in Cuijiazhai Mine are analyzed, and overall investigation on the deformation characteristics of surrounding rock under the influence of mining are made.In addition, using bolt-mesh strengthening principle and anchor supplement support theory, the bolt-mesh-anchor support parameters are optimized and the design scheme of support is put forward.The observation results in the field show that the roadways surface displacement are greatly reduced by using the new support scheme, and the intensive deformation of roadway cross-section is effectively controlled.This method can not only speed up the construction of the roadway, but also reduce the cost.The technical measures described in this paper provide a reference for the mines with similar geological conditions.

Causes of Karstic Collapse in Lead-zinc Mining Area and its Countermeasures

GUO Wei-Jun-1Cui-Xiao-Yan, CHEN Xue-Jun

2009, 39(12):  41-43. 

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Karstic collapse is a common geological disasters in karst mining area,  The causes of karstic collapse in this lead-zinc mining area are analyzed from physical geography and geology, and  Human factors. Then the control measures of karstic collapse from land utilization are raised.

Research on Mining Technology of Thin Ore-body for Gongchangling Iron Mine

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

2009, 39(12):  44-45+125. 

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In view of the condition of Gongchangling underground thin ore-bodies， for  A new mining method consisting of the stoping and carving with characteristics of drawing ores in medium-length and controlling ores in the end was formed.After industrial tests，some process parameters were determined，providing an efficient and safe mining method for the steep and thin ore-bodies for Gangchangling underground mine.

Application Analysis of Composite Foundation Treatment Technology in Highway Widening Project

ZENG Xue-Min, HE Li-Biao

2009, 39(12):  46-49. 

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Based on a highway widening project, using a “coordination and control of distortion” treatment thinking, the mechanism of composite foundation to prevent differential settlement are analyzed and a combined subgrade treatment Program of powder injection pile and geo-grid was proposed. Then its treatment results were evaluated. Dynamic monitoring results show that the differential settlement of cross section is 0.2 mm, and lateral displacement is 2 cm, which is in line with regulatory requirements. The results show that the widened roadbed deformation after treatment of composite foundation and the deformation difference between the new and old can reach a desired effect.

Distribution of Displacement Field of Residual Slope during Hanging Wall Ore Mining

KANG Zhi-Qiang, LI Fu-Ping, LI Wen-Jie, 南Shi-Qing

2009, 39(12):  50-52+6-. 

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The veining up mining of hanging wall ore destroys the slope rock structure, redistributes the stress of slope rock, and affects the stability of slope. Taking the veining up the hanging wall ore residual slope of Shirengou Iron Mine for example, three-dimensional numerical model of veining up mining of the high residual slope of Shirengou Iron Mine is established, and stability of residual slope are analyzed through calculating with numerical simulation by using the large-scale finite element numerical simulation analysis software of ANSYS. The conclusion shows that this mining has little effects on the overall stability of the open pit slope of Shirengou iron ore, and the mining of residual slope is stable, but the supporting and management of roof at tunnel exit and goaf should be strengthened.

Test Research of Raising Coarse Filling Tailings with New HHZ-cyclone

ZENG Fan-Xia, LI Mao-Lin, ZHANG Lei, CUI Rui, WANG Bin, ZHU Ye

2009, 39(12):  53-55. 

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Three different structure cyclone with diameter of 100mm are researched in the laboratory and the differences between multi-cone angle HHZ-cyclone and 100、200  standard cyclone are compared. Based on the result, the multi-cone angle HHZ150 cyclone used in industrial research is designed, and its parameters can be changed, and compared with CZ150 cyclone. The study proves that the multi-cone angle cyclone has a lower separation size, and can improve the yield of the underflow of cyclone and then produce more high-quality coarse filling tailings under the same diameter of cyclone and process conditions.

Effects of Different Types of Coal on Direct Reduction of Refractory Iron Ore

XU Cheng-Yan, SUN Ti-Chang, YANG Hui-Fen, MO Xiao-Lan, YANG Da-Wei, JIA Yan

2009, 39(12):  53-67+76. 

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Under different roasting temperature, reduction agent dosage, roasting time, fluxing agent and different grinding fineness, and taking the lignite coal (C1) and fluxing coal (C2) as reduction agents, the effects of different coal types on direct reduction roasting and magnetic separation were investigated. The results showed that the reduction effect of C2 was better than that of C1 without addition of the fluxing agents. The fluxing agent can improve the effect of direct reduction, especially for C1. With the addition of fluxing agents, DRI (Direct Reduced Iron) of 90.32% and 90.34% can be obtained by C1 and C2 respectively, while the recovery with C1 is higher by 5.30% up to be 80.66% than that of C2. Even, C1 costs less than C2, so the coal C1 is more beneficial to the reduction of iron ore.

Research on Recovery of Residual Pillar and Layout of the Monitoring Points

LIU Pei-Zheng, HU Yong-Quan, ZHANG Chuan-Xin, KOU Yong-Yuan, GUO Hong-Dong

2009, 39(12):  56-60. 

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The finite difference procedure FLAC3D was adopted to simulate the recovery of the residual pillars in Tianmashan gold mine till the destruction of the roof strata. When the roof damaged, the displacement mutation occurred and the calculations did not converge. Therefore, how the displacement mutation and calculation convergence happened can be as a criterion to judge the roof damage. According to the surrounding rock stress and displacement variation rules in stoping process, and combined with the on-site monitoring devices and numerical simulation results, a theoretical foundation is provided for the monitoring points layout optimization and forecasting for the sudden collapse of mined-out area, thereby enhancing the direction and accuracy of on-site monitoring. It is concluded that: ①Destruction occurred from roof first. This area is the most sensitive area of surrounding rock displacement and can be as the monitoring points for judging displacement mutations, and is a preferred location for multi-point displacement layout. ②After pillar recovery, the top surrounding rocks affected by mining induced the stress transferring to the terminal of the mined-out area. With the exposed area of mined-out area increasing, the bearing stress in the terminals becomes larger. However, when the roof strata damage in mined-out area occurred, the path of this transferring was blocked. So the top rock weight in top of mined-out area no longer delivered downward to the terminals and then the stress in supporting area decreased, showing a rebound phenomenon of stress. This phenomenon provides a theoretical foundation of predicting the sudden collapse of mined-out area for on-site stress monitoring. Therefore, layout of stress monitoring in the terminal point of mined-out area is superior to other locations.

Experimental Research on Beneficiation of Reverse Flotation for  Yuanjiacun Iron Ores with New Type of Reagents

LUO Liang-Fei, CHEN Wen, LI Wen-Feng

2009, 39(12):  61-63. 

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A new type of anionic reverse flotation CSC-68, and a new modifier CSR-36 developed by Changsha Research Institute of Mining and Metallurgy were adopted to make the inverse flotation tests on magnetic separation concentrate for Yuanjiacun iron ore, and then test results are compared with that of four reagents combination of the traditional NaOH + Starch + CaO + fatty acid anions collector. The results showed that by combining two new agents, the iron ore concentrate in reverse flotation with grade of 66.06% and recovery of 87.19% are obtained. The ratio of iron grade and recovery with the traditional four reagents combinations are higher by 0.96% and 0.87% respectively. New agents are not only superior in beneficiation index, but also can greatly simplify the agents system. Moreover, scaling problems in the pipeline caused by CaO can be avoided. 

Beneficiation Experimental Research on a Refractory Oolitic Hematite of Guizhou Province

GUO Yu-Feng, YANG Lin, JIANG Tao, LIANG Jun

2009, 39(12):  68-72. 

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A high-phosphorus oolitic hematite minerals in Guizhou province, embedded in fine particle size. The hematite particle size are less than 10 micron observed by microscope, and the oolitic structure with no obvious nuclear or gangue mineral nuclear appeared. The beneficiation tests on this iron ore were carried out. The results showed that the traditional beneficiation method can not effectively separate the ores. And through the magnetic roasting-magnetic separation process, an iron concentrate with 55.74% Fe grade and 57.11% Fe recovery could be obtained, however, the content of phosphorus are high up to 0.258% in iron concentrate. The iron concentrate obtained by magnetic roasting-Magnetic separation was leached by sulphuric acid. Then, the P grade was decreased to 0.065%, Fe grade was increased to 57.73% with a 50.81% total recovery.

Test Research on the Flash Magnetization Roasting Technology for Complex and Refractory Iron Ore

WANG Qiu-Lin, CHEN Wen, YU Yong-Fu, YAN Xiao-Hu, LIU Xiao-Yin

2009, 39(12):  73-76. 

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The paper describes the type of complex refractory iron ores and the beneficiation situation, summarizes the mechanism of magnetization roasting for refractory iron ores, and introduces the characteristics of new technique of magnetization roasting and its typical tests results, namely Flash Magnetic Roasting.  It is pointed out that the flash magnetization roasting technology can realize the economic and high-efficient utilization of the complex refractory iron ore which can not or less be used in the past.

Experimental Study on Beneficiation of an Oxidized Lead-zinc  Mine in Ganluo County, Sichuan Province

YU Jiang-Hong, ZHOU Tao, LIU Shou-Xin

2009, 39(12):  77-79+98. 

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According to the Pb-Zn ore natures in Ganluo county, Sichuan province, such as high oxidized degree, unevenly mineral particle distribution, and easy pelitization, the processing of lead floating by sulfuration and zinc float by desliming has been adopted with the assistance of high-efficient collector S-8 for lead flotation and amines combined collector A-9 on oxide zinc flotation to perfectly separate lead and zinc. The experimental results showed that lead concentrate with Pb grade of 63.40% and Zn grade of 2.53% at a lead recovery of 76.96%, and Zn concentrate with Zn grade of 38.31% and Pb of 0.87% at a Zn recovery of 81.83% were obtained. 

Experiment on Cu-Bi Cyanide-free Flotation for Cu-Bi Multi-metal Ores in Jiangxi Province

YE Xue-Jun, QIU Shu-Min

2009, 39(12):  80-82+130. 

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The Cu-Bi multi-metal ores in Jiangxi were treated by adopting the Cu-Bi mixed flotation - Cu-Bi separation flotation techniques with new type of organic depressant XTL-3 to realize the high efficient Cu-Bi cyanide-free separation. With the grinding fineness of -74 μm 70%, copper concentrate grading of 27.51% at an 88.71% recovery and bismuth grading of 20.14% at a 77.58% recovery were obtained respectively. Meanwhile, Bismuth content in copper concentrate is 0.14%, and Copper in bismuth concentrate is 2.13%.

Flotation Test Research for a Primary Gold Ore of Shandong

SHI Lei, LIN Hai, DONG Ying-Bo, CHEN Jing-Yu, LIAN Fang

2009, 39(12):  83-85+102. 

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The Isoamyl Xanthate and Butylamine Dithiophosphate are used together as collector in a Gold Beneficiation Plant of Shandong. And a flotation process of one roughing -two cleaning-two scavenging for gold ore with grinding of -0.074 mm 60% is adopted, only obtaining a gold recovery of about 59%. Thus, researches mainly focusing on the reagent condition tests and the grinding fineness tests were carried out. The tests results indicated that the gold concentrate with Fe grade of 30.83 g/t and Fe recovery of 93.36% was obtained by a closed-circuit flotation of one roughing-one cleaning-one scavenging with conditions of BD-11 as collectors, Copper Sulfate as an activator, 11# oil as the foaming agent, and the grinding fineness of -0.074 mm 60%. By this method, the gold recovery can be rapidly improved, compared with the on-site production.  

Quality Control System of High-precision Related Mining GPS Data Processing

LONG Ren-Bo, GAO Jing-Xiang, WANG Jian, ZHOU Feng

2009, 39(12):  86-88+92. 

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According to the characteristics of high precision related GPS data, the problems which should be paid attention to in the data processing are introduced, and the related symmetry weight function is constructed to improve the quality of data processing and the calculation speed.Through the analysis of the major factors which influence the quality of data processing, the robust estimation model of correlated observation data with outliers is invested and the existing IGIII scheme is improved by constructing the related symmetric weight function to keep the symmetric of the weight matrix.Then a relevant symmetric weight function is constructed to improve the original IGIII scheme, and keep the symmetric of the weight matrix and the corresponding matrix.The results show that the improved algorithm greatly saves the calculating time, ensures the correctness of the model and improves the quality of data processing.

Application of the IP Method to the Exploration of a Pb-Zn Ore Deposit in Western Yunnan

ZHU Hong-Jun

2009, 39(12):  89-92. 

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The application of Induced polarization method in exploration of a lead-zinc mine in western Yunnan showed that the region depending on the rate of  M_s magnitude of the minimum charge was at 3% up to 21%, the background field is generally from 5% to 7%, the anomaly field generally 15%. The maximum apparent resistivity ρs is 910 Ω·m, and the minimum is only 25 Ω·m. So the anomaly field has a clear distinction with the regional background field. After exploration, an anomaly zone was delineated, and the proven antimony, lead-zinc veins were found. The application results show that through the induced polarization method can effectively delineate the distribution scope of induced polarization anomalies and its morphological characteristic to understand the buried depth and spatial occurrence of the polar body, thus effectively guiding the exploration works.

Ground Movement Prediction of No.2 Nickel Mine Area in Jinchuan Based on GIS and ANN

DENG Qing-Hai, MA Feng-Shan, YUAN Ren-Mao, ZHANG Li-Ping

2009, 39(12):  93-97. 

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Based on GPS monitoring data on No.2 Nickel Mine Area in Jinchuan, a new idea of quantitative prediction of ground surface movement by means of GIS and ANN(Artificial Neural Network) was put forward and the specific method was given.The whole process of ground surface movement prediction based on ANN may be carried out in GIS platform by Avenue programming, including designing data mode, designing and training network framework, testing network framework, forecasting by network, and so on.Such works as data processing, contrasting testing results and analysing forecasting results were achieved by GIS.The Elman ANN prediction model was realized by the technique of Matlab 6.5 program with VB6.0, which was integrated in GIS by Avenue programming.The results stated that the ANN prediction model supported by GIS had a theoretical feasibility and realistic significance in predicting ground surface movement, and GIS and ANN had a wide application prospect in prediction of exploitation subsidence.

Automatic Monitoring System of Yunfu Pyrite Tailings Pond

ZHOU Yu-Xin, DUAN Yong

2009, 39(12):  99-102. 

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Tailings displacement, saturation line and other security data are usually observed by men. These artificial observations are so insufficient and not accurate enough, which can not meet the requirement of safety management. According to the specific conditions of tailings ponds in Guangdong Yunfu pyrite mine, the automatic monitoring system was designed and installed. Through a trial operation and an actual observation, the system was operating normally, where each indicator can meet the requirements of relevant specifications and construction units.

Study on Visual Simulation of Mine Ventilation Network Based on GIS

LI Cheng, TAN Hai-Qiao

2009, 39(12):  103-106. 

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Based on analyzing the research status of the mine ventilation at domestic and abroad, and according to the insufficiency of mine ventilation management system, the visual simulation system of mine ventilation network was designed and developed by using Geography Information System (GIS) technology, which has  functions of mine ventilation management, visual simulation, automatically building topology, real time ventilation solving. And the practical application of them with the ventilation data of a mine in Pingdingshan mine area has verified the feasibility and practicability of the system，providing a new access to mine ventilation information management, inquiry, simulation for the coal production management department.

Research on Construction of Call Center in Mining Enterprises

XIA Shu-Fa

2009, 39(12):  107-109+125. 

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This paper introduces the concept and development of call centers, analyzes the demand for call center in mining enterprises, describes its system structure and working principle, and discusses its function and some other issues in construction. 

Advanced Control of Grinding-classification Process Based on CBR Soft-sensor

XIANG Bo

2009, 39(12):  110-113. 

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Due to the difficulties of online measurement and direct closed-loop control of grinding particle in grinding-classification process, the case-based reasoning technique was adopted to build an online soft-sensor model for grinding particles. Then, based on this, an advanced inferential control scheme was proposed to achieve the closed-loop control of particle size. This advanced control system can automatically adjust the set-point of the lower-level PID controllers according to the operational conditions. As long as the outputs of the PID control loop can track their adjusted set-point, the closed-loop control of particle size will be achieved. The industrial application in a mineral processing plant showed that this proposed approach can achieve good performance of estimation and control of particle size.

The Prevention and Treatment Technology of Geochemical Engineering on Acid Mine Drainage

LEI Liang-Qi, SONG Ci-An, XIE Xiang-Li, LI Yan-Hong, WANG Fei

2009, 39(12):  114-120. 

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The prevention and treatment technology of geochemical engineering (PTTGE) on acid mine drainage (AMD) is a sort of geochemistry method (including the prediction and assessment of AMD, the covering and the permeable reactive barriers) to predict and on-site treat the AMD (and heavy metals) contamination based on the AMD origin mechanism. The PTTGE is worth popularizing in China, because it has a lot of advantages, such as the longevity, low price, easy construction, on-site remedy, and especially it can be used to treat the acid waters enriched with the toxic heavy metals, characterized by the high discharge, long time flow.

Safety Assessment of Tailing Pond Based on Catastrophe Theory

GAO Zhen-Xing, ZHAO Jiang-Ping, GUO Jin-Ping, WANG Xue-Ni

2009, 39(12):  121-125. 

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The safety evaluation of the tailing pond is a complex system, hence, many factors should be considered. The current methods of safety evaluation are used to study the tailing pond safety from different angles. But these studies failed to comprehensively distinguish the security situation of tailing pond. Based on the revolutionary theory, this paper uses initial fuzzy membership function and mutation series and combines the revolutionary theory and fuzzy analysis to resolve the multiple layers of target of the whole tailing pond, and then the ultimate catastrophe function can be obtained through quantitative computing by the normalization formula. The safety level of the tailing pond can be determined by transferring the ultimate catastrophe function. The engineering example indicates that the comprehensive evaluation model based on catastrophe theory can accurately judge the security situation of tailing pond.

Study on Data Mining System Framework of Mining Safety Monitoring

LI Chun-Min, WANG Yun-Hai, ZHANG Xing-Kai

2009, 39(12):  126-130. 

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In view of the functions of mining monitoring system, combined with the content and features of mining safety monitoring data, and based on fully understanding the data mining techniques and its application, the data mining system framework of mining safety monitoring information was built.The framework consists of the data acquisition and data source layer, the mining safety monitoring task layer, the mining safety monitoring information application layer, the metadata management and remote management.The key technical issues about the system framework were discussed.

Research Status and Development Trend for Foam Dust Control Technique in Underground Coal Mines

WANG He-Tang, WANG De-Ming, REN Wan-Xing, XI Zhi-Lin

2009, 39(12):  131-134. 

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Aiming at the serious mine dust control situation, the domestic and overseas development history for foam dust control in coal mine, main research contents and its results are described by the method of summary. Problems in research and application process of coal mine foam dust control technique were analyzed. At last, the general development trends were pointed out, namely basing on the basic research of dust basic characteristics, strengthening the basic theoretical research on foam dust technique, getting breakthroughs in key technologies, and developing specialized equipment.

Prediction and Treatment for the Subsidence Area of Beiminghe  Iron Mine based on Numerical Simulation Software

YU Wen-Zhi-Peng, JIN Ai-Bing, LIN Chen

2009, 39(12):  135-137+152. 

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Based on the survey and the classification of the subsidence area of Beiminghe iron mine, a model is created via the numerical simulation software. Because of the requirement of continuity in the numerical simulation software, the plastic distortion of the upper surrounding wall instead of the collapse in the top of mined-out area will be obtained, which is inconsistent with the actual situation. The goaf could be substituted with the collapsing body, so a related numerical model can be created, and then the prediction on the subsidence area can be obtained via the numerical simulation and calculation. Based on this, the treatment measures are proposed, providing a certain reference for the treatment of the subsidence area in typical caving mining.

Preliminary Study on Microbe Circulating Desulphurization Technology for Flue Gas

JIANG Lei, TAO Yu-Ruo, SHEN Chao, GONG Zhe

2009, 39(12):  138-141. 

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The flue gas desulphurization by microorganism technology was established based on Acidithiobacillus ferrooxidans biofilm and multiplex iron system. Immobilizing biofilm has formed on the surface of polyhedron empty ball with the characteristics of high porosity and big specific surface area. This particular biofilm is favorable for Acidithiobacillus ferrooxidans adsorption and SO₂ reduction. Desulphurization test results showed that the conditions of inlet concentration of SO₂ under 1 000 mg/m³, flue input of 1.0 m³/h, and circulating fluid flow of 40~50 L/h were feasible.

Study on Adsorption Properties of Microwave Enhanced Al-modified Bentonite on Ammonia-nitrogen in Wastewater

NIE Jin-Xu, LIU Mi, LIU Li-Fan

2009, 39(12):  142-145. 

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The new adsorbent of microwave enhanced Al-modified bentonite was produced by means of Al₂(SO₄)₃ and microwave radiation, and its adsorption properties on ammonia nitrogen in water was investigated. The experimental study showed that the optimum preparation conditions of adsorbent are 4% of Al₂(SO₄)₃ solution under the radiation for 10 min by 480W microwave. In this condition, the specific surface area of the microwave enhanced Al-modified bentonite can be up to 180.69 m²/g. By adopting this microwave enhanced Al-modified bentonite, the removal efficiency for 100 mg/L of ammonia-nitrogen wastewater will be up to 96.8% under conditions of the pH 10, the total adsorbent dosage of 0.4 g/L and the reaction time for about 20 min.

Treatment of Coal Mine Drainage with the Integrated Reactor

HE Zong-Jian, SHEN Yue, QIU Jun

2009, 39(12):  146-147+167. 

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Under condition of NaOH dosage of 83 mg/L，PAC of 75 mg/L，PAM of 4.2 mg/L，the high concentration SS（300~500 mg/L）mine drainage was treated by the integrated reactor with coagulation-sedimentation and sand filter.After treatment， the effluent quality can reach the first criteria specified in Integrated Wastewater Discharge Standard（GB 8978-1996）.The process has its competitive advantages in treating the coal mine drainage as low investment，low operating costs，less floor area and easy management.

Dry Discharge Process and Equipment for Iron Ore Tailings

ZHAO Long-Lu, YANG Yu-Hua, JIA Cheng-恩

2009, 39(12):  148-150. 

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Lots of iron ore tailings are discharged into tailings storehouse in China, which caused the serious harm on environment and safety. A whole set of dry discharge process for iron tailings are explored by Shandong Coal Mining Equipment Group Co., Ltd. In this process, the tailings are classified by cyclone, where the coarser is filtered with the horizontal belt type vacuum filter, and the finer is concentrated and filtered by the completely automatic vertical filter press. The filtering cake is discharged dryly and the filtering water is recycled. A remarkable economic and social efficiency was obtained in this process. 

Test Research on Preparation of Fine Aggregate Concrete with Fine Iron Tailings

ZHENG Yong-Chao, NI Wen, ZHANG Xu-Fang, WANG Hai-Xia, YANG Jing-Hua

2009, 39(12):  151-153. 

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By classifying fine iron tailings with -0.074 mm of 74.5% to be -0.045 mm, the thermal activation is adopted to improve the reaction activity of -0.045mm iron tailings which are prepared to be the compound Cementitious Materials. This material is mixed with +0.045 mm tailings to make fine aggregate concrete. There are 70% of tailings in preparation and the compression strength of up to 99 MPa at 28 d.

Study on Preparation and Performances of the Water Permeable Brick from Red Mud

LI Guo-Chang, WANG Ping

2009, 39(12):  154-157. 

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The red mud from Shandong Aluminums Company were used to prepare water permeable brick, and then the main factors of affecting the performance of the bricks were investigated. The experiment results showed that the suitable formula for aggregate of the water permeable bricks are red mud of 55%, fly ash 35%, bentonite 10% at an appropriate sintering temperature of 1 150 ℃. Using this aggregate to make the bricks, the appropriate conditions consist of the aggregate of 82% in solid material of bricks, bentonite of 8%, glass powder of 10%, water glass accounting for 8% of solid material at brick molding pressure of 40 MPa, sintering temperature 1 080 ℃, and sintering time 60 min. The compressive strength of red mud water-permeable brick obtained is 35.32 MPa with permeability coefficient of 0.028 cm/s, wear length of 27.35 mm.

Experimental Study on Comprehensive Recovery of Gold and Tungsten from a Certain Tailing of Gold, Antimony and Tungsten

欧Le-Ming , LIU Xu

2009, 39(12):  158-162. 

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The experimental study on gold and tungsten recovery from the a certain tailing of gold, antimony and tungsten which was treated by the combined flow-sheet of gravity separation and flotation is carried out. According to the tailing's characteristic, the selective flotation flow-sheet with the closed circuit is adopted. Then, the gold concentrate of 14.10 g/t with gold recovery of 50.36% and Tungsten coarse concentrate of 1.22% with Tungsten recovery of 49.61% are obtained respectively. The gold concentrate can be used as products directly and Tungsten coarse concentrate should be sent to the on-site process for retreatment. This result can provide a foundation for comprehensive on-site utilization of tailings resources.

Application of Industrial Waste Residue and Tailings to Glass-ceramics

YANG Wei

2009, 39(12):  163-167. 

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The structural characteristics and preparation process of glass-ceramics are briefly outlined and the preparation technology of glass-ceramics made from industrial waste residue and tailings are introduced. And then research progress on the application of glass-ceramics made from industrial residue and tailings is reviewed.