Table of Content

15 January 2008, Volume 38 Issue 01

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Development Actuality and Prospect of Flotation Technology

LI Zhen, LIU Jiong-Tian, WANG Yong-Tian, CAO Yi-Jun

2008, 38(01):  1-6. 

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With China's mineral resources becoming increasingly more complex, leaner and finer, the development of flotation technology is even more important. The development actuality of flotation technology is summarized, and the innovation of the flotation process, new flotation techniques, development of high effective new column flotation equipment and new flotation reagents, and the new concept of mineral separation are discussed. The future development of flotation technology is prospected.

Progress in Automatic Control of Separation Operation in Concentrators

XUAN Le-Xin, ZENG Yun-Nan

2008, 38(01):  7-11+18. 

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Based on the consultation of a great amount of literature data, several new type highly effective separation devices that are widely used now and the advanced control concept they adopt are reviewed. Commonly used testing instruments and devices in mineral processing are also described. It is held that the combination of automatic control technology with new separation processes and high efficiency energy-saving equipment is an important way to realize the progress of beneficiation technology.

Analysis of China's Iron Resource Situation and Strategy of Its Sustainable Supply

WANG Ying

2008, 38(01):  12-14. 

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Mineral resource is an important material basis for China's social and economic development, thus enjoying a very significant status in the national economic development. From the perspective of sustainable development of iron ore resource, the paper analyzes China's iron supply capacity, output and consumption and also the international supply situation. It is proposed to build an economized economy; to improve the exploitation and utilization of domestic iron ore resource through technical innovation; to implement a globalized mineral resource strategy and to set up long-term steady iron ore supply bases abroad; and execute strategies for ensuring a sustainable supply of mineral resource such as finding substituting resources.

Present Situation and Prospect of Correction System for Probability Integral Method

CHA Jian-Feng, GUO Guang-Li, ZHAO Hai-Tao, JIA Xin-Guo

2008, 38(01):  15-18. 

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Probability integral method, as a main method used in China in mining subsidence prediction, has gained wide application. As there is great deviation in the basic prediction from the reality, its practical application has encountered with many difficulties. Based on a comprehensive review of a great amount of literature, the sources for the errors in the subsidence prediction by using probability integral method are analyzed in detail, and the present correction systems for the method are summarized. On this basis, the research orientation of the perfection of probability integral method model is proposed.

Application of AHP Fuzzy Comprehensive Evaluation in Environment Analysis for Metal Mining investment

LI Zhi-Min, ZHANG Qun, SHAO Qiu-Jun

2008, 38(01):  19-23+59. 

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Mineral resource has very important position and function in China's national economy. China is in great shortage of mineral resource and is importing increasingly more ores. Making mineral exploration and exploitation in foreign countries is an important way to solve our mineral shortage and ensure the supply of minerals, and is of great importance to the safe operation of China's economy. However, it will be highly risky and the risk should be effectively reduced by scientific method. AHP fuzzy comprehensive evaluation method is used to make scientific evaluation for the investment environment in the areas feasible for China's international mining investment and to propose selectable regional locations, hereby guiding the investment in foreign countries and effectively reducing the risk and blindness in such investment.

Numerical Calculation of Ground Vertical Vibration Velocity in Interval Charge Detonation

LIU Hong-Yan, 吕Shu-Ran , QIN Si-Qing

2008, 38(01):  24-27+43. 

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Vertical vibration velocity is an important index of blasting vibration intensity. Based on the review of the forecast methods for vertical vibration velocity, an estimation method that uses numerical calculation is proposed. Meanwhile, calculation is also made of the vibration velocity of different particles at three different interval charge structures, namely rock powder, water and air. The calculation results show that they agree well with those practically measured when the explosion center distance is not large and there is a tendency for the error between them to increase with the increase of the distance. For different charge structures, the ground vertical vibration velocity is the maximum in case of water interval charge, secondary for rock powder interval charge and the minimum for air interval charge.

FEM-Based Analysis of Slope Long-Term Stability

WANG Xiao-Ping

2008, 38(01):  28-31. 

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Considering the rock and soil rheological property of slope, it is proposed to use the elasto-visco-plastic constitutive model in combination with the slope stability analysis based on FEM stress field to study mainly the law of the slope stability change with time or deformation development. The correlation of the slope stability with the stress redistribution and displacement has realized a dynamic stability analysis of slope, which will be of great importance to the realization of informationized construction and stability control of slope. Meanwhile, the sensitivity of the effect of viscosity on the safety coefficient of long term slope stability is also studied. The results indicate that the value taking of the viscosity coefficient will have little effect on the long term safety coefficient after the slope is stabilized, but will have great effect on the time needed for the slope to become stable.

Experimental Research on Surfactant in Leaching of Hard Rock Type Uranium Ore

LIU Yu-Long, TAN Kai-Xuan, HU E-Ming, LI Guang-Yue, DING De-Xin

2008, 38(01):  32-35. 

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Based on uranium in-situ leaching mining technology, properties of hard-rock type uranium ore and surfactant functions, the possibility of applying surfactant in in-situ leaching of hard rock-type uranium ore was studied. Two surfactants, P1 and P2, were used in the test of agitated leaching of uranium ore. The results indicate that ①surfactant P1 can evidently improve the uranium leaching yield within the critical micelle concentration range (0.2-10mg/L);②surfactant P2 can also remarkably improve the uranium leaching rate within the critical micelle concentration range (50-150mg/L);③surfactant P1 has a better effect in improving the uranium leaching rate than that by surfactant P2; ④surfactant can remarkably improve the leaching rate of large sized uranium ore.

Mechanics Parameter Back Analysis of F9 Sliding Mass of High Steep Open-Pit Slope in Daye Iron Mine

WANG Peng, ZHOU Chuan-Bo

2008, 38(01):  36-38. 

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In light of the engineering geological conditions of F9 sliding mass of the east high steep open-pit slope in Daye Iron Mine, the tress and strain conditions of F9 sliding mass in the slope excavation process are simulated and analyzed using finite element software. Back analysis is made on the mechanical parameters of this sliding mass according to the site monitoring on its deformation, from which its mechanic parameters C and φ values are found, providing the reference for analysis of the slope stability.

Numerical Simulation of Ground Deformation Caused by Backfill Mining

DU Guo-Dong, LI Xiao, HAN Xian-Min, WU Min-Shuo

2008, 38(01):  39-43. 

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The impact on ground surface caused by cemented filling method when used for mining steeply inclined orebody is different from that by other methods and has its own law. FLAC3D numerical simulation software is used to study the ground surface deformation caused by cemented filling in Jinchuan No.2 mining district. As a result, the general law of ground deformation in this district is proposed, and a preliminary conclusion is drawn that the ground fissures are caused by the mining. The phenomenon that the surface fissure occurrence lags behind the mining is interpreted, the calculation results are revised with GPS measurement results and the calculation reliability is verified. Finally, the effect of the elastic modulus of filling body on surface subsidence is studied.

Research on Long-Hole Blasting Parameters in Large Cross-Section Roadway Heading In Hard Rock at Depth

XIA Hong-Bing, XU Ying, ZONG Qi, FU Ju-Gen

2008, 38(01):  44-46+52. 

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Based on the mechanical property of wall rock at depth and the principle of detonation dynamics, the paper analyzes the effect of the blasthole depth on the cutting efficiency in roadway heading and discusses the common cutting modes in medium and long-hole blasting. The parameters of cutting-blasting, perimeter smooth surface blasting and explosive load in large cross-section roadway heading in hard rock at depth are calculated and the other issues needing attention in the construction are also elucidated, which will be of certain guidance significance to the selection of site blasting parameters and construction.

Causes and Control of Floor Heave in Rheological Weak Rock Roadway at Depth

WANG Qi-Sheng, LI Xi-Bing, LI Di-Yuan

2008, 38(01):  47-49+150. 

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Based on the site survey and practically measurement results of the wall rock deformation and failure of the roadway in Maluping Mine, the causes for the floor heave formation in the rheological weak rock roadway were analyzed and found to be the strong expansibility of mauve shale and water penetration, which were more evident with the increase of the mining depth. Through the numerical simulation calculation, the scope of the roadway wall rock fracture zone and plastic zone, and the stress displacement distribution were analyzed. Technical measures and support scheme were proposed for controlling the roadway floor heave. The industrial test results show that the implementation of this scheme has effectively control the floor heave.

Study on Optimal Exhaustion of Iron Ore Resource and Its Application

MENG Ling-Gang, GAN De-Qing

2008, 38(01):  50-52. 

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In view of the matters such as small per capita occupation of iron ore resource, excessive exploitation of resource and serious waste of resource, and in the principles of sustainability, efficiency and social welfare function, study is made on the optimal exhaustion of iron ore both theoretically and methodologically. Optimal exhaustion simulation is made with the iron ore resource in Tangshan region as the example. The simulation results are compared and analyzed with the real exploitation and utilization conditions of this region in recent years.

Research on Law of Grouting Pressure Change in Rock Mass

WANG Dang-Liang, SUI Wang-Hua, HUANG Xiao-Ming, HANG Yuan

2008, 38(01):  53-56. 

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The circular tube grouting test was made by the established model of grouting slurry tube in rock mass and using piston type grouting pump commonly used in grouting engineering. The test results indicate that grouting pressure and grouting amount in unit time increase with the increase of the transmission velocity of the grouting pump. However, at the same velocity, the grouting pressure will increase with the decrease of the groutability of rock mass. The grouting pressure formed by cement type suspensoid is greater than that by high molecular chemical slurry. The effect of grouting pump, material or rock mass condition on the grouting pressure is mutually affected and mutually restricted. It is not merely an active representation of grouting pump power but a passive representation restricted by several factors such as rockmass condition and grouting material.

Beneficiation Test on Hematite Ore of Certain Mine in Yili, Xinjiang

SUN Yong-Feng, WANG Shu-Hong, HAO Jing-Jing, HU Shan-You

2008, 38(01):  57-59. 

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Based on the study of the physiochemical properties of the hematite ore to be tested, it was determined to use high intensity magnetic separation-flotation process to treat the hematite ore. The test results of high intensity magnetic separation-anionic indirect flotation reached the expected target, with the iron concentrate having an iron grade of 62.37% and iron recovery of 60.87%. In-depth analysis was made of the causes for the difficulties in improving the metallurgical performances, hereby guiding the further tests.

Study on Preparation of Self-Leveling Material with FGD Gypsum

QUAN Liu-Quan, LI Dong-Xu

2008, 38(01):  60-63+79. 

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Self-leveling floor material is made by compounding an inorganic gelatine material or organic material that is used as the matrix material with additives such as re-dispersible gelatine powder. The preparation of gypsum-based self-leveling material with FGD gypsum can turn waste into treasure and has good economic benefit and market prospect. The paper describes the basic properties of FGD gypsum and its treatment process and the study on the effect of the treatment with different crystalline form conversion agents on the performance of the self-leveling material prepared by FGD gypsum, on the effect of the composition of self-leveling material on its performance and on the microcosmic material of self-leveling material.

Beneficiation Tests on Wangjiatan Copper-Siderite Ore

CHEN Xiao-Ming, ZHANG Zong-Hua, QIU Chong-Dong

2008, 38(01):  64-66+79. 

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Tests on low copper siderite ore containing 0.2% copper of Wangjiatan Iron Mine，KunSteel Group，were made to first separate copper and sulfur　from the ore and then to separate iron from the tailing. As a result, a copper concentrate grading 18.15% at a recovery of 72.59%, a sulfur concentrate grading 42.94% at a recovery of 72.14% and an iron concentrate grading 38.19 % at a recovery of 72.21% were obtained.

Experimental Research on Flotation of Hemimorphite Ore

CHEN Ye, CHEN Jian-Hua, LI Yu-Qiong

2008, 38(01):  67-69+120. 

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In light of the features of certain Yunnan zinc oxide ore having a high content of limonite and with hemimorphite as its principal zinc oxide mineral, the effect of desliming condition, calcium sulfide dosage, type and dosage of dispersants and amines on the flotation index of hemimorphite was investigated. The test results show that pre-desliming can effectively improve the flotation performance of zinc oxide ore. The flotation recovery of hemimorphite can reach 89.15%, the run-of-mine based gross recovery of hemimorphite, 64.28% and the zinc concentrate grade, 28.72% when pre-desliming of -11um fraction is performed and 1.67kg/t sodium hexametaphosphate, 1.43kg/t octadecylamine and 14.28 kg/t sodium sulfide are used.

Study on Sedimentation Performance of Henan Low Grade Bauxite

CHEN Zhi-You, CHEN Xiang-Qing, CHEN Xing-Hua, MA Jun-Wei

2008, 38(01):  70-72+75. 

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Sedimentation method is used to study the sedimentation behavior of bauxite concentrate at different pH values and flocculants, and the effect law of anionic, non-ionic and cationic polyacrylamide flocculants, and the change in molecular weight of anionic flocculant on concentrate sedimentation. The results show that when the medium pH value is 7.0, anionic polyacrylamide flocculants have the best effect on flocculation results and the best dosage is 30 g/t.

Research on Beneficiation Process for Certain Refractory Gold Ore from Yuannan

YOU Teng-Sheng, WANG Shu-Ming, WANG Ren-Dong, CHEN Wei

2008, 38(01):  73-75. 

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In light of the complex properties of a refractory gold ore from Yunnan, gravity separation, combination of gravity separation and flotation, and regrinding and flotation of rougher concentrate were investigated. It was finally determined through open-circuit lab test that rougher concentrate regrinding and flotation was the optimal process for this ore. The process obtained a concentrate gold grade of 84.67g/t, gold recovery of 46.03%, silver grade of 220.0g/t, relative gold sulfide recovery of 100% from a rougher concentrate containing 6.49g/t gold, with the gross gold recovery being 87.82%, relatively good results.

Assessment of Uncertainty of Impurity Elements in Sintered Iron Ores by XRF Method

REN Chun-Sheng, ZHANG Ai-Zhen, YING Hai-Song, LE Ying-Jie

2008, 38(01):  76-79. 

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Detailed analysis is made on the origin of the uncertainty in impurity element determination with the case of SiO₂ measurement for sintered iron ore by X-ray fluorescent spectrometry (XRF). The uncertainty of the measurement results is assessed. This method is also suitable for the assessment of the uncertainty of XEF determination for other impurity elements in iron ore.

Study on Mathematic-Economic Model for Fine Vein Orebody in Dachang, Guangxi

WU Wei, QIN De-Xian, ZHOU Kai-Feng

2008, 38(01):  80-82+113. 

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Dachang Tin Mine in Guangxi is a major tin industrial base in China and fine vein orebody is one of the main orebodies in Dachang's Tongkengkuang tin deposit. Based on the analysis and research of this orebody, a mathematic-economic model is established by using large geological software Surpac and geological statistic principle, thus providing a basis for the dynamic management of the mine data and a scientific ground for the full and rational utilization of mineral resource.

Setup of GPS Control Net Coordinates and Its Effect on Traverse Accuracy

LU Jian-Tao

2008, 38(01):  83-85+92. 

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What GPS measurement gets are WGS-84 geocentric spatial rectangular coordinates while what is used in engineering construction is generally local independent coordinates. The two coordinates can be mutually transformed by Ye Xue'an principle of two elliptic balls and by plane or spatial transformation models. However, it was found in the data processing using GPS software in a control net engineering measurement that the transverse had a poor accuracy. Therefore, the results of the error compensation of 2D base line of two kinds of coordinates in GPS net were compared and analyzed. It was concluded that in setting up independent control net by using GPS, the coordinates in the data processing should be made in conformity with that densified by conventional means.

Application of SLon Continuous Centrifugal Separators in Recovering Fine Iron Minerals from Mine Tailings

CHEN Lu-Zheng, REN Nan-Qi, XIONG Da-He

2008, 38(01):  86-88. 

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SLon centrifugal separators realize a continuous centrifugal separation in centrifugal force field by applying the cleaning and cutting principles of water beam jets to centrifugally pressed large density particle layers. The machines are characterized by good separation, large throughput, energy conservation and environment friendship. 10 SLon-1600 mm x 900 mm units were used in the tailing recovering process of SLon high intensity magnetic separators for roughing and centrifugals for cleaning in Hainan Steel. Nearly three months' industrial test of SLon continuous centrifugal separators achieved a concentrate with a grade of 56.56% and iron recovery of 61.59% from a feed grading 50.25% at a unit throughput of 2.0~3.0 t/h. Its successful application in Hainan Iron and Steel Co. will produce considerable economic and environment benefits.

Computer Monitoring System for Crushing Process in Concentrators

LI Chang, LI Yong-Lun

2008, 38(01):  89-92. 

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In light of the requirement for the crushing process control of concentrators, a computer control system was developed by using PLC and industrial control configuration software. GE9030 PLC was adopted as slave computer to realize the automatic control of the production equipment, interlocking protection and real time data collection; and host computer supervision station adopted Citect configuration software to design and realize the concentrated display and processing of process information, and provide full functions such as production data statistics, automatic report generation, on-line operation guidance, alarming and monitoring. This system has proved itself in real operation to be rational in system function design, reliable in operation, easy to operate and convenient for management, and able to evidently improve the production efficiency.

Effect of Feeding Mode on Classification Performance of Vortex Air Classifier

FENG Yong-Guo, LIU Jia-Xiang, LIU Sheng-Zhao

2008, 38(01):  93-96+154. 

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The effect of two feeding modes (with and without mechanical pre-dispersion of the feed) on the performance of vortex air classifier was tested using cement raw material and heavy calcium carbonate as feed. The results show that the mechanical dispersion device at high wind velocity has little effect on the classification particle size but can evidently improve the classification accuracy. When the dispersioning device is used, the classification accuracy for cement raw material is evidently higher than that of heavy calcium carbonate. Cement raw material is apt to agglomerate due to the difference in its particle size and structure. It is indicated that this dispersioning device is more suitable for the classification of materials that are easy to agglomerate.

Application of 3D Mining Digitalization Software and Development Trend

HU Jian-Ming

2008, 38(01):  97-99. 

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Mining software has become one of the four conditions in mining cycle process and is the only way for realizing mining informatization and improving the efficiency of exploration, design, production and management. The paper, in light of the application features of both domestic and foreign mining softwares, points out the functional characteristics that mining softwares should have in actual application and illustrate in an explorative way of the future development orientation of mining softwares.

Forecast of Economic Life of Mine-Use Electric Wheel Truck

GUO Nian-Qin, HU Ming-Zhen, ZENG Ai-Bing

2008, 38(01):  100-102. 

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The calculation of economic life generally includes static and dynamic types. With the seven 154t 630E mine electric wheel trucks put into use in 1999 in a large open-pit mine as the object of research, a deterioration value model of electric wheel model is established and several calculation methods of economic life are used. The economic life of the electric wheel trucks is found to be 11 years, providing a basis for evaluating the economic life of domestic mine-use electric wheel trucks.

Mine Environment Problems and Control Measures

TAO Zhi-Xiang, CHENG Xian-Xiong, ZHAO Mei-Zhen

2008, 38(01):  103-106. 

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The paper describes the main problems in China's mine environment, which is characterized by adverse production environment, discharge of “three wastes”, geological disaster, destruction of environment resource, etc.In light of these problems, the paper suggests to adopt the treatment way of administrative system, such as, to establish an explicit property right system of mine environment resource, to perfect the legal system concerning the mine ecological environment protection, and to execute the mine environment access system.Meanwhile, the paper puts forward the technical control measures including clean production, “three wastes' treatment and ecological reclamation of used land for the improvement of China's mine environment.

Experimental Research on Particle Characteristics and Rheological Properties of High Concentration Red Mud

WANG Xing, ZHAO Xue-Yi, QU Yuan-Yuan, HU Wei-Wei, CHEN Jie, WU Miao

2008, 38(01):  107-109+134. 

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Red mud consists of fine particles (d₅₀ =13.02 μm) and exhibits a high concentration high viscosity paste solid-liquid two-phase flow in piping transport. The testing of its rheological property indicates that testing methods such as rotational viscometer can not reflect its real flow state in piping, with the measured rheological parameters larger than real ones. Based on the tube flow measurement principles, self-developed tube type pressure rheological testing facility was used to measure the rheological properties of red mud at different concentrations (60.2%, 63.6% and 66.8%) and the constitutional equation was obtained. It is concluded that the red mud, when flowing in piping, exhibits the properties of non-Newtonian pseudoplastic fluid and its consistency coefficient and flow index will vary greatly with the concentration.

Preliminary Discussion on Application of LEC Method in Safety Assessment in Non-Coal Mines

WANG Xie-Yun

2008, 38(01):  110-113. 

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The paper presents the types of non-coal mine safety assessment　and expounds the job risk analysis method (LEC). In light of the real conditions of a non-coal mine in Zhejiang, the operation sites where accidents are apt to occur in the mine are selected as the assessment object and a quantitative assessment is made of the whole mine system by using LEC method. The major and minor hazards and harmful factors of the mine are found. LEC method is one of the most commonly used quantitative assessment methods for non-coal mine safety assessment. The assessment conclusion basically accords with the mine reality.

Application Study of Abrupt Change Theory in Accident Prevention Management

MU Qing-Guo

2008, 38(01):  114-117. 

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The accident occurrence can be understood as the system abrupt and qualitative change caused by the continuous change of some parameters in the system. The transfer of the system from safety state to accident state is in fact an abrupt phenomenon. The paper makes a detailed analysis of the accident causes, describes the application of abrupt theory in the accident prevention management and illustrates that it is very necessary to apply the abrupt theory in the accident management and to establish the accident abrupt theory.

Discussion on Safety Assessment System for Underground Transport in Metallic Mines

WANG Ping, LIU Zhen-Ping, XU Meng-Guo, WU Xuan, DU Zi-Jian

2008, 38(01):  118-120. 

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In view of the features of the operation process of underground transport in metallic mines, analysis and digging of the hidden danger of various accidents are made by safety assessment methods such as accident tree. In light of the different features of various work types and modes of hazardous accidents, the paper describes the relevant safety assessment methods that are both scientific and reasonable. Moreover, a safety assessment information system for underground mine transport is developed on VB platform.

Research on Optimization Design Method for Mine Multi-Stage Fan Station Ventilation System

CHEN Yi-Hua, SUN Huo-Ran

2008, 38(01):  121-124. 

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Commonly used methods for optimization design of mine multi-stage fan station ventilation system are described. Scott-Hensley method and point potential analysis method of graph theory are used in the optimization design for ventilation systems of two mines. The feasibility and respective features of these optimization methods are described and Scott-Hensley arithmetic is considered as simple and easy to control.

Research on Utilization of Pyrite Cinder from Sulfuric Acid-Making

ZHANG Jun, ZHANG Zong-Hua

2008, 38(01):  125-127+152. 

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China has rich pyrite resource, which is not only a sulfur resource but also an important iron resource. Therefore, compared with other materials for acid making, acid-making with pyrite has a congenital favorable condition. We have found through the study on the mineral properties of pyrite cinder that the iron minerals in the pyrite cinder are mostly of honerycomb-like, dissemination and residual structure, especially of dissemination structure. Therefore, the iron grade and recovery will not be high when conventional methods are used in its separation. It is proposed to use the waste heat from the acid-making process to recover the iron in the acid-making tailing by a countercurrent process. Under the conditions of a grinding pulp density of 65%, 1 000 A/m magnetic intensity of half-countercurrent wet permanent magnetic separator, 8% CaCO₃, 5% 2# reagent, 40min treatment time and 8% C dosage, an iron concentrate containing 63.55% iron and 0.19% sulfur can be achieved, with a recovery reaching 83.11%.

Prospect Analysis of Comprehensive Utilization of Scattered Metals in Xitieshan Zinc Concentrate

XIE Keng, WEN Jian-Kang, HUA Yi-Xin

2008, 38(01):  128-130. 

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Xietieshan has a large output of zinc concentrate, which is associated with scattered metals such as indium, germanium, gallium and cadmium. Their contents reach 175g/t, 18g/t, 20g/t and 3 713g/t respectively, making them generally have a utilization value. In light of the practicability and market demand of these scattered metals, and their occurrence characteristics in Xitieshan zinc concentrate, their potential economic value are calculated and analyzed, and the current situation and the prospect of their comprehensive utilization are described.

Effect of Microwave-Assisted Reduction on Magnetic Separation of Pyrite Cinder

ZHANG Ze-Qiang, HU Wen-Xiang, SHEN Shang-Yue

2008, 38(01):  131-134. 

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Microwave reduction roasting was used to modify the magnetic properties of pyrite cinder, and the effect of microwave reduction on the subsequent low intensity magnetic separation of the modified cinder was investigated. The results indicate that microwave reduction roasting is faster and more effective than conventional carbothermic reduction. The key factors affecting the modification of the magnetic properties are the reduction temperature and the dosage of accelerant while the dosage of reductant is not obvious. At a reduction temperature of 500℃ and an accelerant dosage of 10%, a concentrate grading 61.56% Fe and having a recovery of  86.13% can be obtained by magnetic separation of roasted cinder, rather good results.

Research and Practice of Tailing Grade Reduction in Concentrator of Luzhong Metallurgy & Mining Group

LI Kui-Xing

2008, 38(01):  135-137+141. 

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Based on the process mineralogical study of the run-of-mine ore in the concentrator of Luzhong Metallurgy & Mining Group Corporation, the main factor affecting the iron recovery is found to be the oxide ore and magnetite intergrowth particles. In order to recover the iron ore resource, JLSW 200 disc permanent magnetic separators were installed to recover the iron from the concentrator tailings, which has achieved preliminary effect. Tests were carried out on the concentrate recovered from the tailings by regrinding and re-concentration process. The results show that at a grinding fineness of 85% -0.076mm, an iron concentrate grading 60.32% can be obtained, attaining the aim of effective recovery of iron ore resource and improvement of the economic benefit.

Effect of CaO/SiO₂ on Crystallization of Glass Ceramic Made from Nickel Slag

WANG Ya-Li, NI Wen, ZHANG Jin-Rui, MA Ming-Sheng, LIU Feng-Mei

2008, 38(01):  138-141. 

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The paper describes the preparation of glass ceramic from Jinchuan nickel flash furnace slag after iron removal. The effect of CaO/SiO₂ on the crystallization of glass ceramic made from nickel slag is investigated by differential thermal analysis method. The effect of CaO/SiO₂ on the microstructure of glass ceramic made from nickel slag is analyzed by XRD diffraction and SEM analysis techniques,and the difficulty of crystallization, crystal shape and crystallinity change law of glass ceramic from nickel slag at different CaO/SiO₂ ratios are found.

Test Research on Reducing Grade of Tailing of Dahongshan Iron Concentrator

HAN Xiao-Yi, YANG Jie-Wei, CHEN Jia-Dong

2008, 38(01):  142-143+152. 

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The tailing of Dahongshan Iron Concentrator has a high iron grade of 27.92%, representing a serious metal loss. Further reduction of the tailing iron grade for comprehensive recovery of resource is imperative. Four schemes were tested and the one of high gradient magnetic separation (HGMS) flowsheet (HGMS roughing, HGMS cleaning and HGMS scavenging) achieved good metallurgical performances, the tailing iron grade being decreased to 11.96% and the concentrate having a grade of 52.38% and recovery of 73.97%.