Table of Content

15 December 2008, Volume 38 Issue 12

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Progress in the Application Research of Magnetic Treatment Technology in Mineral Processing

QIU Ting-Sheng, CUI Li-Feng, FANG Xi-Hui

2008, 38(12):  1-4+8. 

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A comprehensive review is made of the progress in the application research of magnetic treatment technology in mineral processing achieved in recent years, including the basic theory of magnetic treatment technology, its application in the flotation of metal ores and non-metal ores and in the chemical leaching, and the present situation, development trend and existing problems in the research of magnetic treatment mechanism. Magnetic treatment technology is a comparatively new technology and it has unique characteristics and wide application prospect. Enhancing the comprehensive utilization of magnetic field and mineral processing technology will be no doubt of important significance to the environment protection, energy preservation, resource recovery, formation of magnetic treatment mechanism and development of mineral processing technology.

Necessity for China to Establish a Global Strategy of Mineral Resource

LIN Ping

2008, 38(12):  5-8. 

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The rational exploitation and utilization of mineral resource is one of the hot spots attracting world concern. Against such background, the paper studies the mineral resource deployment globalization of the main developed countries, summarizes its main features and based on this, analyzes the causes for China's establishment of a global strategy of mineral resource so as to realize the sustainable development of China's mineral resource.

Exploratory Analysis of the Oversea Expansion of Chinese Enterprises of Mineral Resource Type

LIU Tian-Yu

2008, 38(12):  9-11+20. 

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The globalized development of mineral resource type enterprises is of important significance to the development of Chinese national economy and society. The main problems restricting the oversea expansion of Chinese enterprises of mineral resource type are analyzed and the relevant proper countermeasures are suggested.

New Continuous Mining Technology with Large Access Trackless Mechanized Combined Filling

YANG Yu-Ping, ZHOU Xu, WANG Yi-Ming, REN Jian-Ping

2008, 38(12):  12-15. 

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In the mining of deep-seated complex deposit in Huize Lead-Zinc Mine of Yunnan Chihong Zinc-Germanium Co., Ltd, the continuous mining technology with hydraulic-prop roof support combined filling was used to reform the traditional upward horizontal slicing filling method. With the roof support by monomer hydraulic props as its technical core, the method also adopts controlled blasting, combined detachable isolation wall and trackless mechanized construction technology, enlarged access section and increased waste rock backfill amount to realize a continuous mining. As a result, the stope roof stability is ensured, the mining process simplified, the cutting engineering quantities reduced, the dilution-loss further reduced and the mining capacity improved.

Study on the Floor Heave Mechanism of Roadway in Swelling Soft Rock and Its Coupling Support Technology

WANG Jin-Xue, YANG Sheng-Li, CHEN Zhong-Hui

2008, 38(12):  16-20. 

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Floor heave is one of common forms that causes deformation and failure of roadway. It is an important factor and key problem restricting the safety and high-efficient mining productivity, especially in deep mining and mines with complex geological conditions. Study was made on the floor heave of roadway at high ground stress and fractured swelling soft rock conditions. The floor heave mechanism was analyzed, a mechanical model for compound floor heave under complex conditions established and the constitutive equations of roadway floor plastic zone and floor pressure were deduced by dynamic pressure theory. In light of a mine case, a bolt and cable coupling support design plan was proposed and the numerical calculation was made for the stability of roadway support using FLAC－3D software. The research result shows that enhancing the support at the key part of the sliding body in the plastic zone of roadway floor can effectively control the occurrence and development of roadway floor heave.

Study on the Wall Rock's Physical and Mechanical Parameters of Testing Stope in No.10-6 Ore Body of Yunnan Tin Mine

QIU Jing-Ping, XING Jun, SUN Xiao-Gang, SONG Zhan-Ping

2008, 38(12):  21-23+50. 

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The physical parameters and mechanical parameters of rock (body) are characterized by randomness and variability. The current research on rock's parameters is made mainly through laboratory experiments and experience. Based on a great deal of lab tests and the analysis of the probability distribution law of engineering rock (body), the statistics characteristics of the physical and mechanical parameters of marble in the testing stope of No. 10-6 ore body in Yunan Tin Mine were studied. The results show that these parameters of marble are random and variable, and their testing data have evident statistic regularity. Therefore, the probability distribution law of each parameter can be used to rationally determine the physical parameters and mechanical parameters of  the rock (body) in the testing stope, so as to provide a basis for determining a rational mining mode for the ore body.

Practical Application of Rock Failure Process Analysis System in a Mine

南Shi-Qing , TANG Chun-An, MA Tian-Hui, HU Wen-Jian

2008, 38(12):  24-26+30. 

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In mine engineering, rock orebody extraction or mining can induce a redistribution of the surrounding rock stress, lead to rock failure due to stress concentration, brining a serious safety problem to the mine production and construction. Therefore, it is very necessary to analyze and study the surrounding rock stability in extraction or mining, locate the dangerous sites and work out preventative and control measures. The paper describes the application of the Rock Failure Process Analysis System in the analysis and study of the surrounding rock stability in the mining engineering of TangSteel Shirengou Iron Mine and the formulation of the safety mining plan, which has successfully guided the mine production practice.

Discuss on the Underground Crushing System in Caolou Iron Mine Reinforcement

GUO Hong-Dong, HU Fu-Xiang, CHEN Xuan-Ze

2008, 38(12):  27-30. 

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After a period of operation, the underground crushing system in Caolou Iron Mine was found to have a cavity in its upper bin. The causes for the cavity in the bin wall were analyzed, a rational reinforcement plan was designed and issues needing attention in ore bin design, management and construction were proposed. The inspection made after a period of operation of the reinforced bin indicates that the reinforcement measures are effective and safe and the reinforced bin wall is in good condition, satisfying the requirement and achieving the reinforcement purpose.

Impact of the Drill-Hole Pattern for Hole-by-Hole Initiation on the Burden Distance Distribution

QU Shi-Jie, TAN Wen-Hui, WANG Jin-Qiang, ZHANG Lei

2008, 38(12):  31-33. 

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Based on the principles of hole-by-hole millisecond delay initiation technique, the basic features of the burden distance distribution for the triangular drill pattern and the rectangular drill pattern are analyzed. The uniformity of the burden distances at the initiation instant is found to be strongly related to the type of drill pattern and has a significant impact on the amount and quality of fragmentation. The concept of the uniformity coefficients of burden distance distribution β, γ, and η are thus introduced. It is found through a comparative analysis that, with respect to the hole-by-hole millisecond delay initiation technique, the triangular drill pattern is superior to the rectangular drill pattern in getting a more evenly distributed burden distances in different directions. If a coefficient of hole spacing  =1.155 is adopted for the triangular drill pattern, the burden distances in all directions will be nearest to each other, being most favorable to the improvement of the fragmentation amount and productivity of blast holes.

Numerical Simulation of the Longitudinal Impact of Hammer Percussive Drilling System

QU Ye-Gao, BU Chang-Gen, CHENG Zhi-Qiang, LIU Bao-Lin

2008, 38(12):  34-38. 

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The process of impact hammer drilling is characterized by high non-linearity and large deformation and damage. The process of its longitudinal impact on concrete was studied by using non-linear finite element program LS-DYNA3D and the deformation and crushing mechanism of concrete under different impact hammer speeds, the impact force, the displacement after penetrating the concrete and impact force-penetrating depth curve of the drilling system were studied. The result shows that the bounces of anvil and bit lead to the many times of percussion of the impact hammer drilling system. In the whole impact and penetration process, the largest impact force peak does not occur at the largest penetration depth. The concrete crushing process under the function of pneumatic impact hammer includes four stages: elasto-plastic deformation, brittle cracking, extrusion crushing and unloading. LS-DYNA3D numerical simulation is used to well represent the physical process of the concrete damage by the penetration of the impact hammer drilling, providing an efficient analysis method for the study of the functioning process of impact hammer on brittle materials and of the optimal design of impact hammer.

Leakage Analysis of the Wastewater Reservoir in Metal Mine and Its Prevention Technology

ZHAO Jiang-Qian, LI Jian-Hua, YAN Rong-Hua

2008, 38(12):  39-41. 

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Based on the investigation of the leakage causes of the wastewater reservoir in a mine in Jiangxi, the mechanism of acid mine water erosion on the earth-rock dam is analyzed and the anti-seepage technique which adopts a vertical seepage-proof wall built with coal ash-concrete is proposed. The practice has proven that such seepage-proof wall can effectively increase the density and reduce the expansibility of the concrete wall so that the durability of earth-rock dam in an acidic environment can be improved. It can be reference to similar projects.

Tunnel Strength and Excavation Effect under Different Stress Paths

SUN Xin-Shuo, QIAO Lan

2008, 38(12):  42-45+50. 

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Numerical simulation was used to obtain the stress path divisions of the soil surrounding the tunnel under excavation. Based on this, the influence of different stress paths on the change law of the surrounding soil strength index was studied. The results show that tunnel excavation can result in four different stress path divisions in the surrounding soil stratum. Different divisions have different influences on the tunnel stability and different stress paths have their respective damage forms. The same damage form (extrusion damage or compression damage) may have basically similar damage strength even if the different stress paths are different while different damage forms may have different damage strengths. Generally speaking, extrusion damage will have a damage strength 10%~25% lower than that of compression damage. The above research results have provided a strong basis for an accurate study of the influence of engineering properties of environmental soil strata.

Study on the Optimal Selection Decision Support System of Chemical Consolidation Material for Rock Mass

LIU Wei-Jian, JIANG Fu-Xing, YAN Feng

2008, 38(12):  46-50. 

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Broken rock accelerative consolidation technology is commonly used for the emergencies and natural disasters in mining engineering and geotechnical engineering．In light of the present secondary accidents induced by proper selection of chemical consolidation materials，, a consolidation material database is established based on the study of the classification of chemical consolidation material properties. In view of the engineering requirements of broken rock accelerative consolidation, a rock mass integrity classification method is proposed. Based on this, a decision support system for a rapid optimal selection of chemical consolidation material for rock mass is developed in consideration of the consolidation speed, strength and cost required by the specific consolidation engineering and its geological environment. Its application in the rapid consolidation of No. 1409 working face in a coal mine in Shandong has verified the rationality of the classification method for chemical consolidation materials and the rock mass integrity classification method for chemical consolidation. The research results can be used as the theoretical basis and auxiliary means for rock mass accelerative consolidation design.

Bench Blast Design Software BLAST-CODE and Its Application in Waitoushan Iron Mine

LI Xiang-Ming, QU Shi-Jie, LI Guang-Hua, ZHANG Hui-Lin, XU Wen-Yao

2008, 38(12):  51-54. 

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Field experiences shows that it is difficult for a blast design based on personal experience to make a comprehensive quantitative analysis of such factors as blastability of rock masses and free surface conditions, making it unable to assure the reliability of the blasting parameters and fragmentation. The development and application of bench blast design software BLAST-CODE is just an effort to solve this problem.Based on the pit geological and topographical database technology and the rock blastability classification based on clustering method, BLAST-CODE blast design software enables an computer-aid automatic computation of drill pattern design and explosive amount in accordance with the conditional parameters such as rock blastability, free surface conditions and explosive strength, and a detonation network design in a man-machine interaction way. Its application in Waitoushan Iron Mine shows that this software is characterized by scientific and rational selection of blast parameters and easy application, and it is of great practical significance to the improvement of blast fragmentation and the realization of routine blast design standardization

Optimization of the Pre-concentration Process for Meishan Iron Ore

HU Yi-Ming, LIU Jun

2008, 38(12):  55-57+112. 

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Tests were made on four processes to pre-concentration for discarding waste for 50～20 mm, 20～2 mm and 2～0.5 mm ore size fractions of Meishan Iron Mine, where 0.5～0 mm went directly to magnetic separation and the magnetic separation concentrate joined the final iron concentrate.  The optimal one achieued with the iron concentrate grade and recovery being 57.21% and 75.64% respectively.

Research on the Beneficiation Process for a Complex Multi-metal Ore  Containing Iron, Sulfur and Copper

LI Jun-Ning, XIAO Chun-Lian, WANG Ju, LI Liang, YUAN Qi-Dong

2008, 38(12):  58-63. 

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The run-of-mine ore contains valuable minerals such as iron, sulfur and copper minerals. It is characterized by several recoverable minerals, high pyrrhotite content and complex ore properties. Flotation reagents were used to improve the floatability of pyrrohotite so as to control the sulfur content of the feed to the low intensity magnetic separation within a low range. A process combining grinding, low intensity magnetic separation and flotation was used and qualified iron concentrate, high-sulfur iron concentrate, sulfur concentrate and copper concentrate were finally obtained.

Test Research on the Beneficiation Process for a Fujian Silver Ore

ZHOU Xiao-Wen, HE Li-Ping, KANG Jian-Xiong, LUO Xian-Ping

2008, 38(12):  64-66+82. 

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In light of the ore properties of a silver ore, a process consisting of flotation and gravity separation by tabling was proposed. Na₂CO₃ regulator and BK-301+LP-02 mixed collector were used in the flotation, achieving a silver concentrate grading as high as 1 210.00 g/t at a recovery of 64.52%. The flotation tailing was treated by gravity separation of tabling, increasing the total silver recovery by 3.93% and to 68.45%.

Study on the Numerical Simulation of Velocity Profile of Turbo Cyclone Separator

YANG Run-Quan, WANG Huai-Fa

2008, 38(12):  67-69+73. 

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FLUENT software was used to make the numerical simulation of the internal flow field of a newly self-developed turbo cyclone separator. As a result, the distribution law of the internal three-dimension velocity field of this separator was found, which has enabled a further knowledge of its separation mechanism and structural optimization, laying a theoretical basis for the equipment development.

Investigation on New collectors for Improving the Copper  Flotation Recovery of Dexing Copper Mine

ZHAN Xin-Shun, ZHONG Hong, LIU Guang-Yi

2008, 38(12):  70-73. 

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Flotation tests on different new collectors for Dexing copper ore were carried out. The results show that modified thiourea collectors are strong collectors for copper minerals and their recovery of copper is better than that by monothiophosphates and thionocarbamates. The result of the industrial test with a collector combination of modified thiourea TU-32 and small amount of butyl xanthate (BX) indicates that compared with BX system, this collector system can remarkably reduce the lime consumption in two-stage copper-sulfur separation and improve the quality of copper concentrate by additional recoveries of Cu 1.05%, Au 7.16% and Mo 3.90%. As modified thiourea collectors have powerful collection ability for copper minerals and good selectivity for iron sulfides, they have been used in the production of Sizhou Concentrator in Dexing Copper Mine.

Investigation of the Pre-concentration of a Shanxi Ultra-lean Magnetite Ore by Using BKY Pre-separator

ZHAO Rui-Min, DONG 恩Hai, SHANG Hong-Liang

2008, 38(12):  74-76. 

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he features of BKY drum magnetic separator for pre-concentration are described briefly. A small BKY pre-separator was used for a Shanxi ultra-lean magnetite ore containing much earth. The result shows an evident pre-concentration and tailing discarding effect of this separator, thus providing a new way for the exploration and utilization of magnetite resource of this type.

Measurement of High Content Sulfur in Iron Ore by High Frequency Infrared Absorption Method

WANG Yan

2008, 38(12):  77-78. 

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he high frequency infrared adsorption method can measure 1%～3% high sulfur content in iron ore, lifting the upper limit of sulfur in iron ore measureable by high frequency infrared carbon-sulfur analyzer. The method is proven to have good precision, linear correlation coefficient and recovery, providing a theoretic basis for the extension of the national standard.

Research and Realization of the Synthetic Stratum Histogram in Regional Mapping Technology Based on GIS

LIU Gui-Ping, ZHANG Xiao-Fan, CHEN Chuan

2008, 38(12):  79-82. 

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Based on the collection and analysis of the basic geological data of Xingjiang Tacheng Basin and on the GIS technology, a synthetic stratum section database for Tacheng Basin was established and a synthetic stratum historgram drawing model was designed and used to complete the automatic drawing of the relevant form, the labeling of writing information and the making, mapping and managing of lithological symbols. The lithological symbol database was established and each symbol coded, realizing the automatic symbolized expression of all lithological historgrams by matching the attribute codes of historgrams with those of corresponding lithological symbols. The technology is an improvement of the conventional drawing of synthetic stratum historgram.

Quantitative Evaluation of Surface Water Seepage in  Complex Karst Mining Area with Lowering Water Level

CHEN Yue-Sheng

2008, 38(12):  83-86+115. 

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Fujian Makeng Iron Mine is a super-large underground iron mine in China, belonging to karst water mine area with complex hydrogeological conditions. Its exogenous river-Xima River flows through the mine area, intersects with the fault at several sections. and supplements the karst water through seeping into the fractured belts of faults, constituting an evident threat to the deep mining. Based on the detailed analysis of the relation between Xima River and karst water in the mine area and in light of the conditions of the sections where there is possible seepage, an automatic monitoring system for surface water flowrate was designed and built, eliminating the problems of high time and labor consumption and great error in manual measuring of deep-cutting river in mountain area. Through the calculation and analysis of the monitoring data, the seepage conditions at various sections of Xima River at the present drainage for production and the karst water level on continuous lowering are known, providing basic data for a combined control of the surface and underground water in the mine area. This method can be reference and guidance to the mine areas with similar conditions.

Analysis of the Ore-Controlling Factors of Deqen Yangla Copper Ore District in Yunnan and Its Ore-Hunting Prospect

HU Guang-Long, JIANG Hua, JIANG Jing, HU Deng-Pan, NIU Chun-Lin

2008, 38(12):  87-89. 

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Yangla copper deposit is of skarn-porphyry type and is characterized by ore-forming element pre-concentration in early (volcano) sedimentation setting and obvious multi-stage mineralization, involving a complex ore-forming process mainly with porphyry mineralization. The ore district has a good ore-hunting prospect and has great potentiality in the resource increase both within and around the district. The emphasis in the next stage ore-prospecting should be laid on the joint section between Linong and Lunong ore segments, the north extension of Jiangbian ore segment and the Beiwu, Nilu, Tongjige and Jiaren ore segments in the vicinity of the district and Geyading and Qulong zones.

Dynamic Modeling of Ball Mills

LIU Jian-Hua, XIE Yong-Fang

2008, 38(12):  90-93+104. 

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The simulation system of grinding and classification process can realize an on-line detection of product size under various operating conditions, providing guidance to the optimization of operating parameters. The ball mill is an important equipment unit in the grinding-classification circuit and therefore, the mathematic model of ball mill is the basis of this process simulation system. The paper uses the theory of the grinding kinetics and material balance to analyze the relationship between the practical operating parameters and mill power consumption, introduces the selection function to establish the dynamic mathematical model of ball mill, establishes the mill power consumption prediction model based on gray-box neural network, constructs the simulation model by Matlab's Simulink module and makes the simulation analysis of the model. The model efficacy and disturbance tests have verified the effectiveness and rationality of the model.

Practical Survey-Based Comprehensive Evaluation Method for Stope Mining Quality and Its Application

LUO Zhou-Quan, XIONG Li-Xin, LIU Xiao-Ming, MENG Wen-Quan, LI Chang

2008, 38(12):  94-97+108. 

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In light of the difficulties in evaluating the quality of conventional stope mining such as acquiring accurate technical and economic indicators and establishing a suitable mathematical model, a comprehensive fuzzy math evaluation method based on site survey is proposed. An evaluation index system is built based on the technical parameters such as dilution and loss of the mining obtained by CMS system and the mining economic indexes provided by the mine information system. Normalization and weight value for each index are made and a quality evaluation model for stope mining is constructed based on the developing criteria for optimal least-squares and fuzzy math theory. Its practical application shows that the evaluation index parameters obtained can accurately reflect the real conditions of stope mining and the model can be used to effectively realize a quantitative evaluation of the quality of stope mining, providing a new method for managing the mining quality.

On Analysis Method for the Shortest Path of Urban Roads Based on ArcGIS Engine

XIAO Hai-Ping, CHEN Lan-Lan, PENG Tao

2008, 38(12):  98-100. 

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ArcGIS Engine is a typical representative of secondary development of embedded GIS. A network analysis system is set up by using the developing technology of embedded GIS and taking into consideration of the main factors of the network composed of various roads and pipelines. Preliminary research is made on the organization of the road data of the shortest path of urban roads, the relevant technique and methods, and an experimental environment is built.

Application of WebService-based Mobile Terminals in Mines

JIANG Tong-Qiang, ZUO Min

2008, 38(12):  101-104. 

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The paper studies the possibility of combining J2ME computing platform targeted at mobile devices and WebService technical architecture to develop a mobile application for mines and provide an expansive mobile application model for the constrained computing platform for mines. By means of J2ME and WebService technologies, a mobile Web service mine application system is developed and realized that supports SOAP protocol and XML data format lightweight and safe solution.

Design of Dynamic Weighing System for Mining Electrical Shovels Based on Master and Slave Computers

ZHOU Xiao-Feng, XIAO Jun-Sheng, LI Yu-Jun

2008, 38(12):  105-108. 

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The design of the online dynamic ore-weighing system for electrical shovels is presented. In the system, the slave computer collects the data and transmits them to the master computer through serial communication for computing. All variables that may influence the shovel weight are analyzed by dynamic knowledge and suitable sensors are selected for measuring them according to their characteristics and scope. The slave unit AT89C52 controls a periodic sampling and transmits the sampling values to the master PC, which does the computing, memory and display based on Visual C++ language.

Study on the Stability of Fluid in Hydrocyclone

LIU Pei-Kun, YU Yong-Fu, YUAN Ji-Zu

2008, 38(12):  109-112. 

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The radial distribution of circumferential velocity in hydrocyclone is simulated by computer discrete calculation and the stability of its fluid is judged according to Rayleigh discriminant. It is found that the fluid flow in hydrocyclone is unstable, which is unfavorable to the separation process in hydrocyclone. It is pointed out that it will be a new way for hydrocyclone development to reduce the instability of the fluid so as to improve the performance of hydrocyclone.

Screening Performance Indexes and Screen Surface Configuration of Discrete Type Vibrating Screen

SHI Xiu-Dong, QIAN Lin-Fang, XU Ya-Dong, WANG Dong-Heng

2008, 38(12):  113-115. 

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The screening performance indexes and screen surface configuration of new type discrete vibrating screen are studied based on screening theory. The throwing coefficient, jump exponent and theoretical expression of their correlation are found and the screen mesh configuration structure of this device when used for asphalt mixture agitator is analyzed, providing a theoretical basis for the structure design and application of this kind of device.

Study on the Factors Influencing the Gas Hold-up of Swirl Injection Flotation Column

CHENG Yu, SONG Yong-Sheng, LI Bin

2008, 38(12):  116-120. 

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The gas holdup of flotation column is a very decisive factor for the flotation result. Study is made on the effect of the fluid static pressure, flowrate and aeration rate of the swirl injection flotation column when using clear water without any frothing agent on the gas holdup and the change of gas holdup when baffles are added. The results indicate that the gas holdup increases with the increase in the fluid static pressure, flowrate and aeration rate, with the flowrate having the greatest influence and the static pressure the least. When baffles are added, the gas holdup increases with the increase in the baffle height and the distance between the baffles and the pulp injection port. For a proper gas holdup, the baffle height should be 2/10 of the total column height and the distance should be controlled at 5/10 to 7/10 of the column length.

Discussion on the Steel Ball Attrition and the Rule of Ball Supplement Plan

GUO Yong-Jie, LUO Chun-Mei, DUAN Xi-Xiang

2008, 38(12):  121-123+144. 

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In view of the steel ball attrition in ball mill, analysis is made of the laws that the ball attrition speed is in direct proportion to the ball weight and that the ball attrition speed is in direct proportion to its surface area. Both laws of attrition are used to analyze the distribution of the size fractions of balls when the ball mill comes to its balance and their respective ball attrition curves are found out, providing a reference to making a proper ball supplement plan.

Classification and Modeling of 3D Mine Entities

LI Guang-Qiang, LI Jiao-Jiao, DENG Min

2008, 38(12):  124-127. 

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3D mine GIS is an important supporting technique for digital mines while the classification and modeling of 3D mine entities are the basis for 3D mine visualization and management. The paper first classifies 3D mine entities into static and dynamic ones according to their states in mine production process; then proposes to use extended-surface modeling for the static entity set and voxel modeling for the dynamic entity set; and  finally describes the integrated management and visualization methods for these two types of entities in 3D space. The feasibility of the proposed methods is verified by a case study of a metallic mine in Hunan.

Integrated Optimization of the Control Parameters of Hydraulic Excavator Based on Isight and AMEsim Software

WANG Tao, TAO Wei

2008, 38(12):  128-130. 

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Excavator's manipulators were modeled by applying the French AMESim software for realizing the dynamic simulation of the integrative mechanics-electronics- hydraulics system. A multi-discipline optimized design for the parameters of PID controller was made by using the optimization software Isight and AMEsim, improving the conventional design method. The results show that the tracking error of beam jack decrease 57.4%, that of stick jack 26.7%, and that of bucket jack 4.3% compared with those obtained by the original PID controller, indicating a great improvement and enabling an accurate dynamic tracking. Moreover, the design efficiency is improved as the adjusting time for determining PID control parameters is reduced compared to that needed by the conventional method.

Application of 3D Data Field Visualization Technology in Digital Mines

LAI Chao-Hui, LIU Xiu-Guo, HUA Wei-Hua, LI Feng-Dan

2008, 38(12):  131-134+138. 

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The paper introduces the concepts of 3D data field visualization technology and digital mine, illustrates the practical application of this technology in the orebody surface modeling, grade block modeling and grade isosurface modeling by a real case of developing a fully home-made mining software named “solid mineral resources estimation and three-dimensional orebody modeling & visualization system” with the authors' participation, and finally envisages the application value and prospect of volume rendering technology in digital mines.

Analysis of Blasting Vibration Signals Using Wavelet Packet Method

LI Cun-Guo, GUO Jian-Bo, ZHANG Yun-Peng, WANG Ling, KONG Xian-Jun

2008, 38(12):  135-138. 

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Blasting-caused vibration is a very complex typical non-stationary signal. The wavelet packet method characterized by good time-frequency localization can be used to make signal reconstruction and energy analysis of blasting vibration wave. “db6” wavelet function of MATLAB is used to compile a MATLAB program to classify the vibration signals into several frequency bands. A velocity peak value and the main frequency are selected from each frequency band and based on this, the energy distribution of different frequency bands are found. It is seen from the wavelet packet analysis of the practically measured blasting vibration signals that the main frequencies of most signals are in the 0~15 Hz low and intermediate frequency bands, which is of practical significance to the safety control of blasting vibration.

Open Pit 3D Production Scheduling System Based on Surpac Software

FENG Chao-Dong, CAO Liang

2008, 38(12):  139-141+156. 

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Open pit mining production scheduling is of guidance significance to the mine construction and balanced production. It aims to further arrange the mining capacity and determine a balanced stripping ratio or ore-rock production capacities so as to ensure the realization of the operator's general requirements on the ore quantity and quality, mining technology, economic benefit, production efficiency, work safety and reasonable utilization of ore resource. The paper highlights the development of the system for open pit 3D mining production scheduling based on Surpac software.

PLC Control System of Mine Air Compressor

LUO Yang

2008, 38(12):  142-144. 

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The safety operation and protection of air compressor is of great importance to the production of factories and mining enterprises. Integrating the conventional relay control, computer control and communication control technologies, programmable logic control (PLC) is designed specially for industrial control. Sensing detection instruments and PLC are used to control mine air compressors, realizing the design of air compressor monitoring system so as to help the production system gain good economic benefits and safety performance. The paper describes the composition, protection function, control principle, system communication, collection of system signals and design idea of the PLC system of air compressors.

On the Transformation of East Ventilation System and Deep Ventilation  Technology for  Hongtoushan Copper Mine

ZHOU Jia-Hong, ZHANG Fu-Qun, WANG Fu-Cheng, SHI Chang-Yan

2008, 38(12):  145-147+156. 

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The expansion of the underground mining capacity and the mining at an increasing depth in Hongtoushan Copper Mine have brought the problems of long ventilation route, great ventilation resistance, many working faces and insufficient air flow rate, leading to a deteriorated environment at the working face. A plan for transforming its east ventilation system was put forward. Testing was carried out on the mine's ventilation system. Based on the testing results, graphic method was used to compute and analyze the feasibility of this transformation plan and the measures for reducing the resistance of the east ventilation system were proposed.

Research on the Comprehensive Utilization of Cyanidation Slags of a Gold Smelter

XU Cheng-Yan, SUN Chun-Bao, MO Xiao-Lan, SUN Ti-Chang

2008, 38(12):  148-151+156. 

Asbtract ( 1986 )  

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The paper studies the integral technology of the multi-element recovery and utilization of the slags from cyanidation for gold extraction and the iron powder concentrate generation by direct roasting of sulfur concentrate from the flotation of copper tailings. It is found through flotation roasting tests that under appropriate process conditions, the effective recovery of multiple valuable elements in the cyanidation slags can be achieved and it is expected to realize the production of qualified iron powder concentrate by direct roasting of high grade pyrite ore at industrial scale. A lead concentrate grading 30.29% at a recovery of 70.12%, a zinc concentrate grading 41.19% at a recovery of 74.93%, a copper concentrate grading 7% and a sulfur concentrate grading 40%～50% can finally be obtained. When the pyrite feed to the roaster has the optimal grade and size and the oxygen enrichment degree is the best, an iron concentrate powder grading over 65% can be obtained, providing a new way for the gold industry to develop toward waste-free direction.

Test Research on the Collector for Sulfuric Acid-free Flotation of Dachang Multi-metal Sulfide Ore

WANG Jing-Shuang, CHEN Jian-Hua, WEI Zong-Wu, LONG Qiu-Rong, ZHOU De-Yan, HUANG Han-Bo, WANG Mei-Jiao

2008, 38(12):  152-156. 

Asbtract ( 1600 )  

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In view of the fact that Changpo cassiterite ore containing multi-metal sulfides has a complex composition, requires a high sulfur acid consumption in bulk flotation, causes serious erosion of equipment and environment pollution, test research was carried out on developing a collector for the bulk flotation of sulfide minerals without sulfuric acid. The results indicate that higher xanthate can float sulfide minerals without sulfuric acid but has low recovery of lead-zinc sulfides, with the xanthate with 9 carbon atoms having the best performance. Mercaptobenzothiazole has a better performance than xanthate for collecting lead-zinc sulfides and new collector DT08 has the best collecting effect for sulfides. It can recover 87.63%, 91.83% and 90.98% for lead, antimony and zinc respectively at a copper sulfate dosage of 100g/t without sulfuric acid, being 14.19, 27.22 and 5.81 percentage points higher than those by conventional reagent regime respectively, thus reducing the production cost and improving the production environment