Table of Content

15 August 2008, Volume 38 Issue 08

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Review of Dahongshan Ore Field Exploitation

YU Nan-Zhong

2008, 38(08):  1-4+105. 

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Yunan Dahongshan Iron Mine 1st phase 4 million t/a project composed of underground mining, mineral processing and piping engineering and Dahongshan Copper Mine 1st and 2nd Phase Projects have all been put into operation with very good technical level and construction results. Presently, both mines are under the design and construction for a capacity expansion. By the end of the Eleventh Five-Year Plan period, the total capacity of the mining area will reach 1.8million t/a. The paper describes the design and construction of Dahongshan mining area, the modern mining that is fully embodied through technological innovation and equipment innovation and the efforts and main achievements in realizing the maximization of the resource utilization, upsizing of the parameters and equipment, continuous transport and control automation and being friendly to environment.

Status Quo, Problems and Countermeasures of Titanium Resource Utilization in Panzhihua Region

WEN Xiao-Lian, GUO Ming-Bin, RAN Ding-Wei

2008, 38(08):  5-8+29. 

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The paper describes the titanium resource conditions in Panzhihua region, analyzes the status quo of and existing problems in the utilization of the titanium resource of this regions and proposes the corresponding countermeasures.

Discussion on the Process Audit of EPC Project

WANG Ren-Zhong, HUANG Ru-Jie

2008, 38(08):  9-12. 

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The process audit of EPC (Engineering Procurement Construction) is an audit on the whole management process of EPC projects and is an exploration of modern audit system in engineering construction field. Through a description of the necessity to practice the process audit of mine EPC projects and of the major points in its implementation, and a brief introduction of its relevant measures, the paper fully demonstrates that the process audit of mine EPC projects is an important embodiment of improving the audit system and realizing an audit innovation, and that it plays an active role in normalizing the behavior of mine EPS, intensifying its management, promoting the internal control system construction of the EPS enterprises-mine engineering companies, enhancing the construction of administrative morality and preventing the corruption in mine engineering construction field. It is an active exploration in the new audit method and mode of mine engineering audit.

Research on the Regularity of the Stope Ground Pressure Change in Large-Spacing Non-pillar Sublevel Caving

SONG Wei-Dong, MEI Lin-Fang, TAN Yu-Ye, HUANG Yong

2008, 38(08):  13-16+39. 

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Taking the adjustment of the stope structural parameters of the Underground Workshop of Daye Iron as the engineering background, based on the data obtained in the macro-survey and the practical measurement of the displacement of the roadway surrounding rock and by adopting displacement back analysis method and FLAC software, the numerical simulation and contrast research on the active law of ground pressure both before and after the adjustment were made from the aspects of the active law of stress, the distribution characteristics of displacement field and the change regularity of plastic fractured region. The research has disclosed the basic law of the change in stope ground pressure in the large-spacing non- non-pillar sublevel caving, which is of great significance to the application and promotion of this caving method in underground metallic mines.

ANSYS-Based Stability Analysis of Stope

WANG Xin-Min, WANG Chang-Jun, ZHANG Qin-Li, YUAN Jie-Ping, CHEN Bing-Qiang

2008, 38(08):  17-20+25. 

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Numerical simulation and nonlinear analysis were conducted on the stability of the typical stope roof in the orebodies in No. 3 ore belt of Shizhuyuan deposit and on the influence of the mining process on the mechanical behavior of the surrounding rock by the finite element analysis software ANSYS. The optimum stope structural parameters were determined by comparing the simulation results of nine typical stope structural models and by considering the factors such as excavation efficiency and mining cost. Suggestions were made the correction and adjustment of the present mining scheme so as to better grasp the stope ground pressure development and change regularity for its effective management and for realizing a safe and efficient mining of the ore bodies.

Analysis of the Seismic Dynamic Response and Stability of the High Rocky Slope at an Opencast Mine

LIANG Li, WANG Wei, LI Ming

2008, 38(08):  21-25. 

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Slope seismic dynamic response and stability have attracted common attention in the engineering and academic circles. The dynamic response and stability of the high rocky slope at an opencast mine were analyzed with ANSYS program in the following way. Firstly, the static finite element analysis was made to determine the initial stress field and the possible slip surface. Then, the slope dynamic response was analyzed and the stress, displacement, velocity and acceleration were studied. Finally, the slope local stability of the key slope parts was calculated and evaluated by introducing a concept of unit safety degree. On this basis, the slope integral stability was assessed by calculating the safety factor of sliding surface and checked by quasi-static approach. Satisfactory results were obtained, providing a scientific basis for the dynamic safety evaluation of this slope.

Research and Application of Mining-Reclamation Combined Process in Pingguo Bauxite Mine

FENG Heng-Qiang

2008, 38(08):  26-29. 

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In light of mine operation characteristics, Pingguo Bauxite Mine has combined the reclamation with the mining operation to form an integrated process. The effective organization and unified planning of its links have helped achieve the goal of the shortest cycle, lowest cost, best results and optimum integral effect. The evaluation of the effect of implementing the mining-reclamation combined process confirmed its good economic, ecological and social benefits.

Intensified Mining Contracting of Jingshansi Iron Mine

CHEN Guo-Li, SHAO Bi-Lin

2008, 38(08):  30-32+44. 

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Intensified mining contracting can enable the employer to realize an early commissioning and designed capacity, get a steady high quality ore supply, shorten the investment payback period and reduce the investment risk; and the contractor to fully display its superiority and utilize various advanced blasting technologies to improve the efficiency and save the cost. Therefore, intensified mining contracting is a win-win management mode. The paper describes the practice of and the economic benefit achieved in the management of intensified mining contracting of Jingshansi Iron Mine.

An Investigation into Magnetization of Siderite Powder by Roasting in Suspension State

JIU Shao-Wu, XU De-Long, LI Hui, SONG Hai-Xia, ZHANG Li

2008, 38(08):  33-35+51. 

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Investigation was made on the magnetization of 40~60 μm Daxigou siderite powder by roasting in suspension state to study the law of influence of roasting temperature, time and atmosphere on the quality of the roasted product. The result indicates that temperature is the primary factor influencing the roasting process, the time needed for perfect roasting decreases with the increase of the roasting temperature. With the oxygen increase in the roasting atmosphere, the product quality degrades because of oxidation. Prior to the complete decomposition of siderite, the FeCO₃ decomposition is the essential factor influencing the roasting effect and a time prolonging would be beneficial to improving the product quality. After the siderite is fully decomposed, oxidation degree will be the main factor influencing the roasting effect and a roasting time increase would lead to a reduced product quality. The product from the suspension roasting of Daxigou siderite powder in a suspension state in a weak oxidation atmosphere with 1.05% oxygen concentration at 800 ℃ or 850 ℃ for one minute can be treated by magnetic separation to obtain a concentrate grading 58.21% iron or higher at an iron recovery no less than 79.39%.

Experimental Study on the Beneficiation of an Oolite Iron Ore from Western Hubei by Roasting-Magnetic Separation

ZUO Qian, WANG Yi, TIAN Fu, YANG Mo-Han

2008, 38(08):  36-39. 

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To exploit and utilize an oolite hematite ore of Ningxiang type in western Hubei, a laboratory test of magnetizing roasting-low intensity magnetic separation was carried out for the run-of-mine ore containing 43.71% Fe and 0.93% P. The test result shows that when the -2 mm run-of-mine ore is blended with coal powder in a ratio of five to one, roasted at a temperature of 750 ℃for one hour, treated by low intensity magnetic separation at coarse size to discard the tailings, finely ground to 96% -325 mesh and handled by two cleanings of low intensity magnetic separation, an iron concentrate with an average grade of 60.12% and iron recovery (to run-of-mine ore + coal powder) of 77.42% can be obtained. However, the iron concentrate contains 0.62% P, which should be reduced through further study.

Reverse Flotation of the Iron Concentrate from Magnetic Separation by  Cyclonic Static Micro-bubble Flotation Column

ZHENG Gui-Shan, LIU Jiong-Tian, LI Lin, ZHANG Zhi-Jun, QIAN Hong-Wei

2008, 38(08):  40-44. 

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Comparative laboratory tests of reverse flotation were carried out on improving the 42.00% low grade mixed iron concentrate from magnetic separation of an iron concentrator by cyclonic static micro-bubble flotation column. The results showed that by one roughing, the concentrate grade of the flotation column was about 67%, three percentage points higher than that of flotation cell. However, the tailing had also a higher grade. For this, improvement was made on the flotation column by adding a pulsating magnetic system and flow-stabilizing pipe. The improved flotation column not only keeps the advantage of high concentrate grade but can greatly reduce the tailing grade. One roughing can obtain a concentrate grading 67.85% at a recovery of 79.22%. To achieve the similar indexes, the flotation cell needs one coughing, one cleaning and three scavengings.

Experimental Study on New Flotation Process for Cu-Pb-Zn Multimetal Sulfide Ore from HuiLi

LUO Xian-Ping, FU Zhong-Yuan, CHEN Hua-Qiang, YAN Qun, QIU Ting-Sheng, HE Li-Ping

2008, 38(08):  45-51. 

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The copper content in the ore inceases with the deepening of mining in Huili Zinc Mine to result in a Cu-Pb-Zn multimetal complex ore. The original flotation process consists of only operations for separating lead and zinc and can not suit the change of ore quality. For this, experimental study was made on a new process of potential-controlled preferential flotation in a sequency of copper, lead and zinc, which used LP-01 as collector for copper mineral, DDTC as collector for lead mineral, copper sulfate and butyl xanthate as activator and collector for zinc mineral respectively and lime as regulator for pulp potential; and the depressant combination of YN+ZnSO₄ for lead mineral in copper and lead separation. As a result, the test obtained a copper concertrate graded 21.24% at a copper recovery of 59.54%,  lead concertrate graded 61.23% at a lead recovery of 53.47% and a zinc concertrate graded 56.43% zinc at a zinc recovery of 87.22%. The new process is both simple and environment-friendly and can be the basis of site process transformation.

Experimental Study on Separation of a Scheelite

GAO Yu-De, JIANG Qing-Mei, FENG Qi-Ming, DAI Zi-Lin

2008, 38(08):  52-54+118. 

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In light of the characteristics of a high calcium scheelite ore, a process is tested which includes the separation of coarse tungsten concentrate by gravity separation after the primary grinding and the production of fine tungsten concentrate by normal temperature flotation and heated flotation of the tailings of the said gravity separation after their regrinding and combination with slime. The concentrate of gravity separation has a WO₃ grade of 68.93% at a recovery of 82.71%; the flotation concentrate has WO₃ grade of 6.7% at a recovery of 9.34％ and the combined concentrate ,WO₃ grade of 68.7％ at a WO₃ recovery as high as 92.05％, indicating fine test results.

Pre-commissioning and Technical Transformation in Lilou Iron Concentrator

QU Ying-Cheng, HUANG Xin

2008, 38(08):  55-57+64. 

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Lilou Iron Concentrator is the first one in China to adopt a process consisting of high intensity magnetic separation for discarding tailings, high intensity magnetic separation for cleaning and flotation for middlings. Since the completion of its construction, pre-commissioning had been made for several times, resulting in the indexes that were far inferior to those designed. In view of this, technical transformation was made on the weak links in the original process found in the pre-commissioning. After the transformation, an iron concentrate having a yield of 38.47%, grade of 64.87% and recovery of 77.14%was obtained in the pre-commissioning, which reached the designed values.

Microorganism Dephosphorization Technology for Refractory Iron Ores

LUO Li-Qun, GAO Zhi, SUN Jie

2008, 38(08):  58-60+95. 

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The paper reviews the characteristics of China's phosphorus-containing refractory iron resource and the traditional dephosphorization technology for such iron ores, discusses the mechanism and development prospect of the dephosphorization of refractory iron ores by microorganism, and introduces some achievements in the research of the microorganism dephosphorization technology for such ores.

Objective Assessment of the Economic Benefit of Quality Improvement & Impurity Reduction of Iron Concentrate

CHEN Yi-Lin

2008, 38(08):  61-64. 

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The quality improvement & impurity reduction of iron concentrate can bring a considerable economic benefit to both sintering and iron making. However, the price addition of the iron concentrate for quality improvement & impurity reduction by way of beneficiation calculated according to the present commonly used method is insufficient and can not reflect the true value of quality improvement & impurity reduction. Therefore, a cost recovery method for calculating the economic benefit of the quality improvement & impurity reduction of iron concentrate by way of beneficiation is proposed. Based on the batch calculation for sintering and iron-making, it calculates the economical benefit by taking mineral processing, sintering and iron-making as a whole so as to objectively reflect the economic value of the iron concentrate that is upgraded by quality improvement & impurity reduction in way of beneficiation. It is of reference significance to the rational pricing of the iron concentrate based on quality.

Study on Precursory Characteristics of Rock Failure Based on Acoustic Emission Experiment

ZHANG Sheng-Jun, LIU Jian-Po, SHI Chang-Yan, LI Yuan-Hui, ZHAO Xing-Dong, YANG Yu-Jiang

2008, 38(08):  65-68. 

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Experiments on acoustic emission (AE) characteristics of complete rock failure process are carried out under uniaxial loading. The stress- strain curve, the relation between AE characteristics and time are obtained. The relation of the time with cumulative AE events, AE energy release rate, and the b-value of the relation between the magnitude and frequency are selected to study the precursory characteristics of rock failure. The results show that during the initial loading phase, AE events are very few and its cumulative number rapidly increases at the late phase of the rock elastic deformation and at the plastic phase; the AE energy keeps a low release rate for a long time during the rock fracturing process but exhibits an evident release just before the rock failure. Before the rock instability failure, b-value will drop quickly, with that of most rock samples reaching the lowest value before the rock failure, These precursory characteristics are significant for the field application of AE monitoring and forecasting technology so as to improve the accuracy of in-situ rock mass monitoring and forecast.

Application of Integrated Geophysical Survey in Detecting Mine Dam Leakage

JU Hai-Yan, LI Jian-Hua, YUAN Yuan-Ping, HU Ming-Qing

2008, 38(08):  69-71. 

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In light of the features and properties of the hidden leakage trouble of mine dams, through site survey and analysis, a joint detection of high-density resistivity method and the ground penetrating radar (GPR) was made. In combination with the relevant geological conditions and the dam body structural characteristics, the distribution range, scale and depth of the hidden leakage trouble were deduced, illustrating that it is feasible and efficient to use the integrated geophysical survey in detecting the hidden trouble in dams and providing reliable technical data for the engineering reinforcement.

Geological Characteristics of Songxian Fangeda Gold Deposit in Henan

GENG Yi-Zhi, ZHENG Ji-Rong, MA Chun-Yang, YANG Xian-Dao

2008, 38(08):  72-73+101. 

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Fangeda gold ore field is located in the Xiongershan uprise-fault zone of Huaxiang platrform uprise at the south edge of the north China platform, which is characterized by the regional fault control of the ore-forming belt distribution and the local fault control of the occurrence of gold deposits (sites), which are distributed in the area 1~5 km distant from the outside the Wuzhangshan rockmass contact belt. In the area, paleovolcanic structure and the ring and radial structures surrounding the paleovolcanic crater are often the spots favorable for ore forming. The outer alteration zone surrounding the granite rockmass of Yanshan stage is also the target of ore prospecting

Secured GML Transmission Techniques Based on Safe WFS Mode

JIANG Rui, SONG Huan-Bin, ZHU Jie-Yong

2008, 38(08):  74-77. 

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With the rapid development of GIS and Internet technologies, E-government system based on GIS has gradually become a necessary component of the informatization construction of governmental departments. However, various forms of stored geographical information make it difficult to exchange and share the information. Geography Markup Language (GML) has effectively promoted the integration of various geographic data sources and is therefore widely used. Meanwhile, great importance should be paid to the security issues it has brought in its wide application. The authors proposes using the encryption and digital signature to ensure the safety during GML transmission and set up a secured WFS concept and the corresponding architecture, which have been successfully applied in a specific project development.

Realization of Virtual Mine Cruise Based on VRML Technique

SHI Fa-Wu, DUAN Zong-Yin, ZHANG Liang-Gui

2008, 38(08):  78-81. 

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To have a general view of a mine through the field visit can be time, energy and financial consuming, which would also be restricted by the mine reality and underground workings. However, through a virtual mine created with VRML technique and assisted by a 2D navigation chart and information query tool, visitors can make a remote visit of the virtual mine on Internet/Intranet by means of the relevant plug-in to get a general view of the mine.

A New Visualization Calculation Method for Residual Ore

LUO Zhou-Quan, LI Chang, MENG Wen-Quan, LIU Xiao-Ming, ZHANG Bao, LUO Zhen-Yan

2008, 38(08):  82-84. 

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The residual ore amount is regarded as an important index for assessing the extraction quality of a stope as it is directly related to the recovery level of mineral resource. In view of the lack of an efficient calculation method for the residual ore in stope, digitalization means such as CMS (Cavity Monitoring System) and SURPAC were comprehensively used in the study. As a result, a new visualization calculation method for stope residual ore was developed, which is based on 3D precision detection of cavities. First, CMS is used to make a 3D precision detection of a cavity; and then SURPAC, to construct the 3D models for the cavity, designed mining unit and bottom structure of the stope. On this basis, a 3D entity model for the residual ore at the stope bottom is constructed. From the model, the spatial distribution and the volume of the residual ore at the bottom can be accurately obtained and the ore amount in the mined cavity can be calculated. The practical application has proven that the method is practicable and reliable and provides an efficient technical means for an accurate calculation of residual ore amount.

Application of Spatio-temporal Data Model in the Mining Scheduling for Strip Mines

DAI Xiao-Ping, WANG Min, WANG Shan-Dong

2008, 38(08):  85-87. 

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In light of the characteristic of the spatio-temporal data of strip mining and based on the existing spatio-temporal data model, the object-oriented spatio-temporal data modeling was used to organize the spatio-temporal data of strip mining and make the strip mining scheduling by an arithmetic integrating dynamic programming and 0-1 integer programming. Taking He Shang Qiao Open-pit Mine of MaSteel as an example, a spatio-temporal database was setup to store the planning results. It was based on the spatio-temporal database with historical, present and planning data that the design and application development for the mining scheduling of strip mines were made.

Integrated Technology for Recovering the Hidden Trouble Resource Based on a Cavity Monitoring System

LIU Xiao-Ming, ZHANG Wei, LIU Wei-Zhou, LUO Zhou-Quan, SUN Li-Juan, DAI Bi-Bo

2008, 38(08):  88-91. 

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Large numbers of cavities formed by the underground mining of metal mineral resources not only endanger the mine safety but cause great difficulties in a full recovery of the resource. Therefore, it has become a major front research subject for the safety production in China's metal mines to take the advanced cavity detection system as the means to research and apply the relevant technology based on a precision detection of cavities. By a comprehensive application of theoretical analysis, site detection and geological modeling, with the cavity laser monitoring system and mining software Surpac as the main tools, in light of the reality of a specific project of recovering hidden danger resource in Tokeng Copper Mine, we carried out the research on the visualized technology for the extraction of the ore pillars at complex boundary based on cavity monitoring. As a result, an accurate 3D pillar model and blasting design parameters were obtained, providing an important basis for an effective recovery of trouble resource.

Study on the Virtual Test Technology of Power and Fuel Economic Performance of Mine Dumping Truck

CHANG Lu, JIANG Zhan-Ping

2008, 38(08):  92-95. 

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The force diagram of mining dumping truck at work whose rear wheels are the driving ones is analyzed. The power and fuel economic performance of mining dumping trucks are established based on ADVISOR software. The acutal test of the mine dumping truck is made on the maximum speed, standing start continuous acceleration time and fuel consumption at uniform speed. The result of comparison with the virtual test one shows only a very small difference between them. The virtual test result can be trusted, thus providing a basis for the virtual design of the mine dumping truck.

Study of the Relation between Flotation Indexes and Froth Digital Images

HE Gui-Chun, HUANG Kai-Qi

2008, 38(08):  96-101. 

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A large number of froth images of laboratory flotation of chalcopyrite were collected and pre-processed. Digital image analysis technique was used to analyze these froth images and their gray histogram. The statistical texture feature parameters of the gray histogram of froth images were extracted and the model for the relation between the flotation indexes of chalcopyrite and the statistical texture feature parameters of those froth images was established by using RBF neural network. The simulation proves the high precision of this model.

Automatic Control System for Acid Sewage Treatment in Tongling Xinqiao Pyrite Mine

DONG Guo-Gui, HE Wei-Xing, HOU Da-Jun, CUI Yu-Min

2008, 38(08):  102-105. 

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An automatic control system is built for the high density slurry process for treating the acid sewage in Tongling Xinqiao Pyrite Mine by using PLC, inverter and Profibus, where Cohen-Coon algorithm is adopted for the control of the lime milk and flocculant dosage in the core link. The practice has proven that this control system has high reliability and excellent performance and is therefore worthy popularization.

Technical Transformation of MZS5518 Wet Autogenous Grinding Mill

DOU Wei-Hua, WANG Yun

2008, 38(08):  106-108+112. 

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In view of the reduced throughput of MZS5518 wet autogenous mill and the frequent accidents such as burned bush due to the harder and more diluted run-of-mine ore, Dongshan Workshop, MaSteel Nanshan Mining Co., in cooperation with the relevant manufacturer, has transformed the lining of its 1# autogenous mill. Specially developed rolling bearing is used as the main bearing to substitute the original sliding bearing bush. As a result, the mill throughput is improved, the lining life prolonged, the electricity and oil preserved and the equipment fault reduced, adding a direct annual economic benefit of at least 12.901 million yuan.

Mine Ecological Rehabilitation and Its Assessment Indexes

ZHU Yi-Bin, ZHOU Lian-Bi, LIN Hai

2008, 38(08):  109-112. 

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The paper first puts forward the concept of mine ecological rehabilitation, and then, based on the analysis of the Land properties, spatio-temporal variability & main ecological rehabilitation restricting factors of open-pit, waste rock dump, tailings pond, subsidence, industrial ground, road, pipeline, office & living area and contaminated water body and land, in light of the ecological rehabilitation characteristics of different sites in mines and from the viewpoint of the whole process, proposes the assessment indexes for mine ecological rehabilitation, which have strong operability and practicability.

Research on the GIS-based Emergency Rescue Management Information System in Coal Mine Disasters

SHAO Deng-Lu, YUE Zong-Hong

2008, 38(08):  113-118. 

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Based on the comprehensive understanding of the coal mining and the research on GIS and the emergency rescue technology for coal mine disasters, with GIS as the development platform, a visualization emergency rescue management information system for coal mine disasters is established by applying the principles of management information system and MapX control. This system includes a rich database and knowledge base, gives a dynamic display on the map of the information closely related to the mine-disaster relief such as the underground danger sources, working face, disaster avoiding route, disaster affected area and distribution of communication and disaster-relief equipment, and can realize a remote interactive aid, thus providing a powerful technical support to the prevention and handling of coal mine disasters and benefiting the improvement of the anti-disaster and disaster relieve ability of coal mining enterprises.

Influence of the Rapidly Changing Reservoir Level on the Stability of Tailing Dam

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

2008, 38(08):  119-122. 

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The stability of tailing dam is of great importance to mine safety production, and the stability calculation of tailing dam under different working conditions is a major work for the stability analysis. The variation of seepage line at a rapidly changing reservoir level and its influence on the stability of dam were studied. Based on the two-dimensional unsteady seepage equation, the variation of unsteady seepage field and seepage line of dam was educed. And the relation between the variation of seepage line and the dam stability was obtained by Bishop simplified method. Combined with a project case of tailing reservoir, the FEA for the seepage of a dam in different time and the calculation of the safety factor of the dam were made. The issues in relation to the safety operation of tailing dam at a rapidly changing reservoir level that should be noticed and their solutions are put forward.

Damage Effect of Under-Expressway Coal Mining on the Expressway

WANG Le-Jie, LI Jing-Dai

2008, 38(08):  123-125+141. 

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The expressway route selection should mainly consider the overall economic and social benefits and especially in case of mountainous areas, it can involve great difficulty and high engineering cost and often has to neglect the special conditions for some local sections. Chongqing Qijiang-Wansheng Expressway passes above the coalfield on the north wing of Nantong Coal Mine of Nantong Mining Company and covers and occupies a large amount of coal resource of the mine. Therefore, mining the coal under the expressway, making quantitative and qualitative research and analysis of the mining-caused damages such as subsidence, inclination, curvature, horizontal movement and horizontal deformation of the expressway by applying the scientific research achievement of the movement and deformation of the overlying layer after the coal mining, evaluating and judging the safety and putting forward safety measures have become new subjects of researchers for coal mining under building, water body and railway. In light of the features of the expressway in mountain areas and taking Qijiang-Wansheng Expressway as example, the effect of the underground coal mining on the expressway was systematically studied and the mining-caused damage evaluated. Preliminary discussion was made on the coal mining under the expressway in operation and the technical measures for the safety were proposed.

Mechanical Analysis and Numerical Simulation of Dust Collection by Impinging Jets

LI Xue, CHEN Hai-Yan, WEI Ai-Yong, ZHANG Ming-Xing

2008, 38(08):  126-129. 

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In view that highly humid dust is characterized by strong adherence and easy glomeration. The technology of impinging jets is used for its collection, solving the problems such as “pasting” and “hardening” in other dry dust collection methods. Based on the analysis of the mechanism of impinging jet technology, FLUENT software is used to simulate the movement and settlement law of particulates in the impinging jet deduster. The simulation result shows that during the dust collection process by impinging jets, two dust-borne air streams in relative movement collide with each other, making the particulates oscillate to form a high concentration zone. This can increase the probability of particulate agglomeration and enhance the dust agglomeration effect, facilitating the increase of dust collection efficiency.

Application of 3R Principles in Planning the Ecological Construction in Ma Steel's Heshangqiao Mining Area

WANG Qun-Fang, ZHU Wei-Li

2008, 38(08):  130-132+136. 

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3R principles of cyclic economy are applied in planning the ecological construction of Ma Steel's Heshangqiao Iron Mine which is to be put into operation soon. In the plan, the engineering construction of its mining and mineral processing will make a full use of the existing facilities of Ma Steel's Nanshan Mine, thus saving a great amount of engineering investment. In the mining process, only the iron ore will be mined out as the product while the burden, waste rock and sewage will be utilized as resources. When the mine is closed, its pit and tailing reservoir will be reclaimed in a scientific manner to create a new tourist spot connecting with Caishiji senior area so as to form a tourist scene line consisting mountain, river, lake and garden. The ecological construction of Heshangqiao mining area will bring along that of Ma Steel's Nanshan mining area and of the eastern Maanshan so as to promote the development of Maanshan City towards an ecological one.

On the “123456”Safety Management for Mining Enterprises

HUANG Quan-Jiang

2008, 38(08):  133-136. 

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Mine safety management is a top priority for mining enterprises. The paper describes the basic contents of the “123456” safety management implemented by Zhejiang Lizhu Iron Mine Group, that is one execution, two comprehensive implementations, three concepts, four transforms, five principles and six rule; highlights the experience in practicing mine safety management; and points out that safety production is a major issue relating to the long safe life of an enterprise.

Research on the Preparation of Glass-Ceramics with Linghu Gold Tailings

CAO Yao-Hua, LIU Hong-Zhao, GAO Zhao-Guo

2008, 38(08):  137-141. 

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To make a comprehensive utilization of the gold tailings deposited in large quantities in Henan Lingbao region, test research was made on preparing glass-ceramics by using the gold tailings in Linhu which is representative in this region as the main raw material. The result shows that when the gold tailings from Linghu is mixed with aluminum hydroxide, sodium carbonate, calcium oxide and zinc oxide in a certain ratio and treated by smelting, water quenching and heat treatment, a glass-ceramics product with β-Wollastonite as its main crystalline phase can be produced. The favorable heat treatment system includes a sintering temperature of 892 ℃ and crystallizing temperature of 976 ℃(T_c＋10 ℃).

Study on the Vanadium Extraction from Graphite Tailings

YU Zhi-Wei, XING Li-Hua

2008, 38(08):  142-144+147. 

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Jinxi graphite ore has high vanadium content. The research indicates that most of the vanadium reports to the tailings in graphite flotation. Therefore, how to recover the vanadium from the tailings has become an issue that should be addressed in exploiting Jinxi graphite ore. In light of the characteristics of the vanadium in the ore and by learning from the vanadium extraction technology from stone coal, vanadium extraction test is made from Jinxi graphite tailings of the flotation test. The result shows that the adoption of a process consisting of roasting with acid addition, water leaching, removal of potash and aluminum, extraction, back extraction and oxidation-vanadium deposition can achieve a vanadium leaching rate, extraction rate, back-extraction rate and deposition rate of 95.5%, 87.6%, 99.9% and 99.0% respectively. Meanwhile, potassium alum and ammonium alum can also be obtained, with their yields in terms of flotation tailings being 9.2% and 23.2% respectively. In addition, as the leaching residue mainly consists of silicate and has high activity, it can be used as the raw material for cement mix and building material.

Pilot Test on Classified Thickening of Beiminghe Iron Tailings

SHI Guo-Wei, LU Xian-Jun

2008, 38(08):  145-147. 

Asbtract ( 1722 )  

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Thickening test was made on Beiminghe iron tailings by a classified thickening process using hydrocyclone and thickener. The result shows total tailings with a concentration of 28%~30% can be thickened to a concentration of over 60% by a classified thickening system consisting of FX125 hydrocyclone , GX-3.6 high efficiency thickener and φ2 000 mm thickening cone. This thickening process is characterized by simple flowsheet, high thickening efficiency, small capital investment, small land occupation and low operation cost, and is capable of high efficiency thickening of whole tailings, facilitating its industrialization.

Technical Transformation of the Process for the Comprehensive  Recovery of Magnetite in Ruyang Molybdenum Mine

LI Hong-Wei, XU Yin-Xing

2008, 38(08):  148-150. 

Asbtract ( 1506 )  

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Ruyang Molybdenum Mine originally adopted a simple flowsheet of direct low intensity magnetic separation to recover the magnetite from the tailings of molybdenum flotation. However, the iron concentrate had an iron grade of only about 20% due to a very fine dissemination particle size of the magnetite. Therefore, the mine finally adopts a two-staged grinding-separation process after two technical transformations. And a secondary classification featuring a tube mill in direct connection with hydrocyclones in the secondary stage grinding, enabling the final grind fineness to be over 95% -400 mesh, the iron ore to have a grade of higher than 63% and the recovery to increase by more than one percentage point compared to that before the second technical transformation. This has brought remarkable economic benefits to the mine.