Table of Content

13 September 2011, Volume 40 Issue 09

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Influence on 400 m Above Ore-body Excavation on Open Pit in Dahongshan Iron Mine

ZHANG Zhi-Xiong, YU 南Zhong, WEI Jian-Hai, YANG Ze, CHEN Fa-Xing

2011, 40(09):  1-4. 

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Stress equilibrium state of stope overburden is destroyed by underground caving mining，which causes the surface distortion and rock layer movement，so the surface construction safety is affected.Because deep ore-body of  Dahongshan is exploited with caving，which will affect the stability of open pit.Influence of ore-body excavation on open pit was studied by FLAC3D numerical simulation method.The results showed that security pillar reserved，the southern ore-body excavation at 400 m above don't affect open pit by calculating the movement angle of 65°，so open project is still stable overall.But if security pillar is not reserved，open pit would be affected by ore-body excavation at 400 m above.The research results could offer instructive basis for safety production of open pit

Study and Application of Mobile Backfilling System in the Underground Metal Mine

YUAN Mei-Fang

2011, 40(09):  5-8. 

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In view of the complex broken ore-body at the underground metal mine with characteristics of difficultly and poor safety，much waste-rock，long filling pipe and complex construction of surface filling plant etc..The mobile backfilling system is researched successfully in the underground mine by improving equipments of concrete mixer and concrete pump，which applies mobile filling pump and pumps waste-rock filling material with high-pressure and high-concentration to stope，and this system is applied in NO.2 western sandstone ore with compound and broken of Hunan Baoshan Mine.Practice proves that this backfilling system has the merits of moving nimbly，high-pressure pumping，high concentration，high efficiency，low cost，and simple pipe installation，etc.It realizes treating waste-rock on-site and mining safety in underground mine.

Application of Underground Waste-rock Crushing System at the Deep Mining of Baoshan Mine

LI Zhi-Chao

2011, 40(09):  9-11. 

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The crushing systerm in the underground is built at the deep mining of Baoshan Mine，and two-stage crushing on underground waste-rock is made with jaw crusher and compound crusher  The dewatering screen is adopted to take off watery slurries from the first crushing，which is effective to solve the blocking problem of compound crusher in high watery waste-rock breaking.And ventilating and dusting system with the hermetic and half hermetic way is applied to purify the air dust of the crushing cave.It realizes to treat waste-rock on-site，and directly use the crushed stone aggregate into the cemented filling in the stope.

Choice and Optimization Study on Mining Methods for Dipping Mid-thickness Low Grade Iron Mine

MA Yi-Min, LIAN Min-Jie

2011, 40(09):  12-15. 

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On the basis of fully analysis of many influence factors of mining method，the mining methods for complex low grade iron mine are selected and optimized by using engineering analogy，empirical design calculation and the test method of the stope Then the low cost，high efficiency grail area，high layer back-filling method which ramp into the stope directly for this mode of ore-body is established，and some mining problems such as high stripping ratio,low efficiency mining for this type of ore body is solved.

Optimization Design of Excavating-filling Engineering Parameters in South of Sijiaying Mine

DONG Lu, GAO Qian, 南Shi-Qing , SONG Ai-Dong

2011, 40(09):  16-20+24. 

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According to the stage back filling method in the southern district of Sijiaying, the feasibility and stope parameter optimization design research are made  Firstly,in the research area based on the engineering geological conditions，the recovery plan and the variation of parameters scope can be determined by engineering analogy and mining the preliminary design.Secondly，according to the parameter selection scope，the numerical model for orthogonal 16 group parameter combination of numerical analysis is established   Thirdly，according to different stope stability and rock movement parameters obtained by the numerical simulation，the function relation between the stope safety, strata movement parameters and design parameters is built by adopting the regression analysis.Fourthly，taking the economic benefit of plate area as optimizing targets of mining, the optimization model is established to realize optimization decision for southern stope structure with the stope stability and rock movement control parameters as constraint conditions  The comparison of this result indicated the stope mining of surface subsidence，the influence of stress and stability.Finally，the numerical analysis on the optimal design parameters is made to research and evaluate the surface subsidence，stope stability and economic benefit of the southern mining area in back  filling method.

In-situ Measurement and Analysis on Concrete Strain of a Main Shaft

CHEN Guo-Qing, WANG Kong-Qian

2011, 40(09):  21-24. 

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In order to thoroughly study the stress and deformation of the wall of well，in-situ measurements on stress and strain of Yuncheng mine in freezing sinking process in Yuncheng was made, which won the variable rule in concrete strain of Yuncheng main shaft outer wall   By contrasting with the allowed or limited strain of concrete， the security of outer wall is predicted.The analysis showed：the tangential strain in outer wall of Yuncheng is large but much less than the limits of high-strength concrete compressive strain   The maximum vertical tensile strain is large but the main strength of concrete has fully grown，so the main shaft side wall is safe.Freeze

Study on the Strength of Protective Coal pillar in Coal Mining under Building， Railway and Water and Theory of New Support Technology

KANG Ya-Ming, LIU Chang-Wu

2011, 40(09):  25-27+32. 

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Coal mining under building，railway and water needs to both ensure safety in production，and recover underground resources reasonably.The paper reviewed the research situation of the strength of protective coal pillar in coal mining under building，railway and water.For the shortage in treatment of the protective coal pillar，Advanced methods such as anchor bolt support，grouting，gangue heaping.On the premise of ensuring “three-under” mining safety，more coal resources could be obtained，and then the theories of three methods were studied.Taking coal mining under building，railway and water of Hongliu mine in Yuanyang Lake Mining Area of Shenhua Ningxia Coal Mining Group Co.，Ltd.as a support，the economic feasibility of the protective coal pillars is discussed

Comprehensive Evaluation of Development Schemes Based on SPA and AHP

LIU Qi, ZHANG Qin-Li, LIU Jian-Gang, XUE Xi-Long

2011, 40(09):  28-32. 

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There are many factors in selection process of the development schemes   In order to avoid the influence factors for development schemes evaluation，such as personal subjective judgment，liking and so on，an comprehensive evaluation method for development schemes was proposed based on the theory of AHP and SPA.Lots of qualitative and quantitative indexes were taken into comprehensive account.AHP is firstly used to determine the index weight.Then, the identica1 degree decision matrix was formed according to the identica1 degree of the corresponding index value between the evaluated plans and the ideal plan.The optimal plan was obtained through comparing the corresponding value of each plan in the weighted identical degree matrix.Meanwhile，taking the development plan optimization in the Huangmailing Phosphate Mine for example，the operation process of this model was specifically described， proving that the method had the superiority in development schemes selection process

Stope Structure Parameters Optimization of Houguanyin Mountain

LIU 恩Yan, ZHANG Qin-Li, WU Peng, LIU Xiao-Ling

2011, 40(09):  33-35. 

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Based on the mining project case of Houguanyin Mountain Iron Mine, the numerical simulations and nonlinear analysis on the stability of typical stope roof and the effects created by goaf on rock mechanical status in orebody are made by using large-scale finite element software MIDAS GTS.Compared with the simulated results of five kinds of typical stope structure mode，the optimal structure parameters of stope is determined according to the excavation efficiency and other factors like mining cost.The practical application in Houguanyin Mountain stope demonstrated that this method was a new way to rapidly optimize stope structure parameters,owning a considerable practical value.

Multi-attributed Comprehensive Evaluation of Mining Scheme Optimization

LI Yan, XU Meng-Guo, MA Jun

2011, 40(09):  36-40. 

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Mining scheme optimization is a typical multi-objective decision-making problem，which involves the economic benefits and resources of mines.Traditional method is usually used to achieve it，but sometimes it's difficult to select the final solution from several non-inferior solutions.In order to seek an effective method in mining scheme decision analysis，on the basis of the model of hierarchy relationship，focused on how to evaluate the weighted average，which was used in the simple method of weighted mean to get the solution.A gold mine was taken  as an example to verify the feasibility，reliability and applicability of the method，which achieved a satisfactory result.

Study on Simulation and Optimization for the Relationship Between End Wall Dip Angle and Breaking Interval for Sublevel Caving

LIU Xiao-Bo, SUN Huo-Ran, LI Shao-Hui, AN Long

2011, 40(09):  41-43. 

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In order to enlarge the structural parameters in an iron mine，the computer simulation system of self-developed pillarless caving method ore-drawing is utilized to gain the relationship between different end wall dip angle and different breaking interval   Meanwhile, the optimal breaking interval is determined by the lab ore  drawing tests.The research results could provide the technical support for an iron mine to achieve the goal of safety，efficiency and inexpensive mining under structural parameters of 18 m×20 m.

Experimental Research on Simulation of Deep Tunnel Destruction Process

ZENG Kai-Hua, XU Jia-Xiong, ZHANG Guo-Feng

2011, 40(09):  44-48. 

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Geomechanical model test is a kind of scale rule research method to specific geotechnical engineering problems based on the similarity principle.The research mainly focuses on rocks.How to effectively simulate the structural characteristics and its occurrence is an important aspect to be considered in experimental design of geomechanical model.In addition, there are some shortcomings in the physical model tests, such as long period, high cost, materials that can not be repeatedly utilized.In view of the problems above, and combining with the occurrence characteristics of deep coal in China, the self-developed YDM-C-type devices for rock engineering and geological disasters simulation were utilized, proposing a new method of simulating the rock mass occurrence and its structural characteristics with the physical finite element plate.The finite element plate that had not been destructed in the last test was recovered and used in the next experiment to reduce the experimental period, and lower test costs.The results showed that YDM-C system can satisfy the similar conditions of model boundary; The plate unit could better simulate the occurrence of rock mass; the physical model established  could well satisfy geological conditions of practical engineering; And the tests recreated the destruction phenomena and processes of practical engineering.

Experimental Study on Water Absorption Processes of Sandy Mudstone in Pingzhuang Coal Mine

LIU Pei-Yu, ZHANG Na, HE Man-Chao, LI De-Jian, TAI Qi-Min

2011, 40(09):  49-53. 

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Based on the hydrophilic testing system innovatively designed by China University of Mining and Technology(Beijing)，test methods and procedures were proposed.The water absorption tests under water pressure and without water pressure on rock samples from Pingzhuang Coal Mine were carried out，and the curves of water absorption processes were formed.The variation principles of the soakage and water absorption velocity under the different water pressure were obtained.Water absorption processes were divided into two stages：absorption slowdown first and constant speed later.The water absorption function curves were fitted.The different microstructure before and after water absorption were compared with SEM，X-ray diffraction experiments，and the results demonstrate that mixed-layer of illite and smectite in the selected rock samples changed obviously before and after water absorption，which was the major factor affecting the laws of absorption of the rock.

Fractal Dimension of Varied Pore Within Coal Based on Mercury Intrusion Method

YIN Zhi-Jun, SHENG Guo-Jun, WANG Chun-Guang

2011, 40(09):  54-57. 

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Micro-structure of coal samples from Datong coal mine and Tunliu coal mine were respectively detected using mercury intrusion method.According to cumulative porosity percentage of pores with various radius of coal，the pores with coal were classified into three categories，namely micro-pore，mesopore and macropore.Combined the calculation principle of fractal dimension of porous structure，the fractal dimensions of three types of pore were obtained by linear regression.The results showed that the fractal dimensions of different pore calculated by section linear regression were able to better describe the complex porous structure，where both fractal dimension of mesopore and macropore was more than that of micropore.It indicates that there exists inhomogeneous structure between mesopore and macropore，as well as obvious discreteness of pore distributed in the range from the mesopore to macropore.

Fuzzy Synthetic Evaluation On Casting Blast Effect Of Heidaigou Surface Coal Mine

MA Li, LI Ke-Min, DING Xiao-Hua, LI Tao, CHANG Zhi-Guo

2011, 40(09):  58-60+64. 

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The effect of casting blast could influence working performance of dragline and cost of production in open-pit.Therefore，to optimize blast parameters was a significant measure to promote the blast effect.Based on fuzzy mathematics theory，the efficient casting rate，coefficient of volumetric expansion，shocking effect and explosive consumption are selected as evaluation factors，and the synthetic evaluation model of casting blast for Heidaigou open-pit coal mine is established.And the effect is evaluated as excellent from analysis of in  situ measurement.The evaluation model's establishment provided an efficient method for evaluating the effect of casting blast for open pit.

Study on Filling Characteristics of High Clay Tailings Cemented by Soil Stabilizer

FAN Zhong-Hua, LIU Peng-Bo, MING Shi-Xiang

2011, 40(09):  61-64. 

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Based on the successful application of the soil stabilizer in the roadbed engineering，the paper introduced the soil stabilizer to the mine tailings filled system to cement the high clay tailings.A series of comparative tests of filling verified the soil stabilizer's good effects on cementing mud and its good filling transmission characteristics，which provided the technical support for the direct use of the high mud tailings.Through this way，the filling process could be simplified and zero emissions of tailings were achieved.

Stope Stability Analysis for the Sublevel Mining Method

WANG Guo-Fu, ZHANG Chao-Fan, ZHANG Fa-Quan, YE Jin-Cai

2011, 40(09):  65-67. 

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The dynamics principle of the sublevel mining method was investigated.Four sublevel mining programs were designed for the mining conditions of Youjiang river area.The movement and the failure process in sublevel mining of the overlying rocks and the shaft were simulated by the finite element analysis software ANSYS.The results showed that in the case of the fixed backfill mixture，the shaft and the overlying rocks in four mining programs were all in safety.

Deep Reduction-magnetic Separation of Laterite-nickel Ore

WANG Ya-Qin, LI Yan-Jun, ZHANG Jian-Ting, HAN Yue-Xin, LI Shu-Fei

2011, 40(09):  68-71+86. 

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The low grade nickeliferous laterite ore was treated by deep reduction，low-intensity magnetic separation，high-intensity magnetic separation process，during which reducing temperature，reducing time，carbon coefficient，thickness of materisl-bed and the backing amount of concentration from high-intensity magnetic separation was investigated.The optimal condition were the reduction temperature at 1 275 ℃，reduction time for 50 min，carbon coefficient of 2.5，thickness of material-beds of 25 mm，the backing amount of concentration from high-intensity magnetic separation of 25 percent of ore by weight.The nickel-iron products in high quality with nickel and iron grade of 6.96% and 34.74%，nickel and iron recovery of 94.06% and 80.44% respectively was achieved by low-intensity magnetic separation，the intensity of which was 130 kA/m，at the same time，the concentration riched in micro-nickeliron particles from high-intensity magnetic separation has good qualities in nucleator.

Electrochemical Study on Pyrite in Acidic Medias

SUN Xiao-Jun, LI Jian-Hua

2011, 40(09):  72-75. 

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The electrochemical oxidation behavior and corrosion kinetics of pyrite in acidic media was investigated by cyclic voltammetry，polarization curves，Tafel curves and electrochemical impedance spectroscopy.The results show that pyrite is oxidized to FeS，which makes electrode passivated; as the potential continue to increase，pyrite is oxidized to Fe2+.The research of corrosion kinetics at different pH values and temperature shows that the corrosion current density decreases as pH values increase; the corrosion current density increases as the temperature rises.It furtherly indicates that  decreasing pH value or increasing temperature in the study range of pH value and temperature accelerates the corrosion process of pyrite.The study o f electrochemical impedance spectroscopy indicates controlling step of pyrite oxidation is different at different potentials，which is consistent with the result of cyclic voltammetry.

Study on Separating Technology of a Congo（Kinshasa) Refractory Copper-cobalt Oxide Ore

欧Le-Ming , HU Ben-Fu, DUAN Jing-Wen-

2011, 40(09):  76-81. 

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Aiming at such characteristics of the Congo（Kinshasa) refractory copper-cobalt oxide ore as high oxygenation，high binding rate，serious sliming and high content of deleterious impurity(Ca,Mg)，a flowsheet in principle was formulated，i.e.preferential flotation of copper-cobalt sulfide and subsequent flotation of copper-cobalt oxide without desliming,and a dressing-metallurgy combination process was drawn up to deal with the micro-fine middlings accumulating easily in the closed beneficiation of copper-cobalt oxide.Raw ore（Cu 3.10% ) was finally treated by closed test process.Then sulfide concentrator with Cu grade 31.52% and recovery 33.25% and oxide concentrator with Cu grade 23.76% and recovery 47.14% were achieved.By leaching metallurgy middlings in dilute sulfuric acid，6.64% Cu could by recovered and total recovery reached 87.03%.Meanwhile，53.96% associated metal Co was recovered.

Bioleaching of a Low Grade  Copper Sulphide Ore by Mixed Culture

HAN Tao, YIN Hua-Qun, LIU Yi, SHEN Li, LIANG Yi-Li, LIU Xue-Duan

2011, 40(09):  82-86. 

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The bioleaching of a kind of low grade sulphide ores was studied used a mixed culture of acidophilic microorganisms in a stirred tank reactor.RT-PCR（real-time fluorescence quantitative polymerase chain reaction) was used to identify the structure of the communities during bioleaching process.The results revealed that the bioleaching efficiency of Cu up to 85.66% in 20 d，and the acid-leaching without inocula only 24.43%.The bioleaching efficiency was up to 79.50% after 12 d bioleaching.At.ferrooxidans was the dominant with increase of Eh and decrease of Fe2+ during the leaching time from 2 to 12 d.After 12 d,At.thiooxidans gradually increased to replace At.ferrooxidans with the leaching rate decreased.Moreover，Mantel test indicated that the structure of the community were significantly correlated with Cu and Fe.

Experiment of Separating Copper Meanwhile Strengthening the Recorery Effect of Associated Gold and Silver in Hongtoushan Copper Mine.

HUANG Hong-Jun, SU Jian-Fang, SUN Wei

2011, 40(09):  87-90. 

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On the precondition of ensuring the high recoveries of copper and zinc minerals.From Hongtoushan the proper grinding fineness，types of collectors and collector dosages for strengthening the recoveries of gold and silver minerals from the complex copper-zinc sulfide containing gold and silver were determined through experimental study.The optimized flotation technology contained one rougher，two scavegings and three cleanings for copper flotation，during which all of the middlings returned to the previous flotation operations accordingly.With the technology utilized in this study，a copper concentrate of 22.22% Cu with a recovery of 92.21% were produced.The grades of gold and silver in the copper concentrate were 5.51 g/t and 295.00 g/t，respectively.The recoveries of the gold and silver in the copper concentrate were 58.07% and 60.51%，respectively.

Experimental Study on a Low Grade Copper-nickel ore from Sichuan

DENG Wei, WANG Chang-Liang, ZHAO Kai-Le, RAO Xi-Ying

2011, 40(09):  91-93+130. 

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A low grade copper-nikel ore in sichuan contains Cu 0.18%，Ni 0.43%.Gangue minerals mostly is magnesium silicate，for example，talc and serpentine.Based on process mineralogy characteristics of this special low grade ore，adopting the closed circuit flowsheet by no removing talc in advance one roughing，two cleaning and four stages of scavenging for bulk flotation of Cu and Ni,one roughing，one cleaning and three scavenging for separating Cu and Ni returning of middling in turn，and a new special depressant WL-001 was added.Then，copper concentrate with Cu and Ni grade of 20.11% and 0.67% at a 55.86% Cu recovery，nickel concentrate with Ni and Cu grade of 5.57% and 0.60% at a 73.96% Ni recovery were respectively achieved by laboratory test.

Beneficiation Study on A Copper Oxide Ore from Indonesia

XIONG Wen-Liang

2011, 40(09):  94-96. 

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Based on mineralogy study on a copper oxide ore from Indonesia，research on process conditions of sulphidizing flotation has been carried out.The reseach results indicated that synchronous flotation of copper oxide and copper sulfide was a effective way to process this ore.A close circuit test showed that with a raw ore assaying copper grade of 1.69% and silver grade of 64.88 g/t， a copper concentrate assaying copper grade of 18.64%，silver grade of 843.00 g/t with coppe and silver recovery of 77.86% and 91.86% respectively ,was obtained by using flow sheet of one roughing,one cleaning and three scavenging and sequential return of middlings.

Experimental Study of a Lead-zinc Polymetallic Ore Containing Highly Pyrite From Yunnan Province

YANG Lin, ZHANG Shu-Guang, JIAN Sheng, ZHANG Xu-Dong, HAN Sai-Qiong

2011, 40(09):  97-100+106. 

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Studied the technological mineralogy of a lead-zinc polymetallic ore which contain highly pyrite from yunnan province，and established the principle flowsheet of beneficiation test process by it.Carriedout a detailed study about flotation agents system of lead and zinc，and the closed-circuit test according to the research.The results indicated that it could obtain the lead concentrate with 43.15% grade and 73.37% recovery; the zinc concentrate with 47.25% grade and 84.94% recovery; the pyrite concentrate with 48.10% grade and 74.05% recovery.The study results also indicated that the copper content in lead concentrate and zinc concentrate was lowly，were 1.57% and 1.30%，which reached the recover required of smelting，the copper recovery in lead concentrate and zinc concentrate were 23.66% and 28.69%，the total recovery was 52.35%.

Experimental Research On Mineral Processing of a Lead and Zinc Polymetallie Ore in Yunnan Province

LIU Mei-Hua, LIANG Yi-Qiang, ZHANG Xu-Dong, JIAN Sheng

2011, 40(09):  101-106. 

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A simple technical mineralogy research is carried out on a lead and zinc polymetallie ore in Yunnan province.Base on the research results，it can determine the flowsheet of  bulk flotation of lead and copper-separation of lead and copper-bulk flotation of zinc and pyrite-separation of zinc and pyrite.Condition tests as grinding finess，reagents and dosage are done.A closed circuit test fhowsheet as one rougher，one scavenger and two cleaners for the bulk flotation of lead and copper，the separation of lead and copper，the bulk flotation of zinc and pyrite and the separation of zinc and pyrite，and middlings  feeding back sequentially，were used to treat the multi-metal ore.Finally two products can be obtained.One is lead concentrate which contains 45.26% Pb at a recovery of 81.33%; the other is zinc concentrate which contains 45.97% Zn at a recovery of 88.29%.But it needs to improve the index of by products as copper concentrate and sulfur concentrate.

Technologic Study of Mineral Processing on Recovering Some Gold and Silver Ore from Low Grade Copper, Lead and Zinc Ore in Inner Mongolia

CHEN Xin-Lin

2011, 40(09):  107-110+119. 

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Based on the research of process mineralogy to some low grade copper,lead and zincores containing gold and silver ore in Inner Mongolia,combining the value system of gold and silver,the main value component in the ore，the flow  project of concentrating gold and silver to copper and lead concentrates is confirmed.According to the technical study of bulk flotation of copper-lead，copper-lead separation，flotation of zinc later,the closed circuit,ore grinding，mixed flotation of copper，lead of one roughing,two scavenging,one concentrate，another grinding，two bulk concentrate，separate of copper，lead of one roughing,one scavenging,one concentrate，zinc flotation of one roughing,two scavenging,four concentrate，middling return in sequence,is determined.The copper concentrate of gold recovery 85.92%，silver recovery 50.99%，and the lead concentrate of gold recovery 5.50%，silver recovery 17.49% are gained.The total recovery of gold is 91.42%，the total recovery of silver is 68.48% in copper concentrate and lead concentrate.

Process Mineralogy Study for a Sedimentary Hematite Ore in Yunnan

LIU Fei-Yan, YANG Lei, XU Ying

2011, 40(09):  111-112. 

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Took the process mineralogy research to Yunnan a sedimantary hematite ore,focusing on the main ore and gangue minerals output form and size characteristics.Research shows that，the ore is low sulfur，high phosphorus，fine disseminated hematite iron ore（limonite)，mainly iron ore，iron ore and gangue minerals between the complex relationship between inlay.Based on the process mineralogy research on improving iron concentrate grade and recovery，reduce the phosphorus content in iron ore concentrate is proposed.Process

Experimental Study on Mineral Processing Technology of High Phosphorous Hematite-limonite Ore in Yunnan Province

DAI Hui-Xin, YU Li, ZHAO Wei, WANG Pu-Rong

2011, 40(09):  113-115+165. 

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An iron ore in Yunnan has complex properties， the useful mineral are mainly for hematite,limonite，phosphorus content is higher， fine disseminated extent and uneven，some of phosphorus occurs in iron ore in the form of isomorphism.Using magnetic separation and gravity separation joint flowsheet with staged grinding-staged separation， available for iron grade is 59.01% ， recovery is 61.06%，0.34% P content of iron concentrate.

Experiment of Reducing Roasting-magnetic Separation to a Refractory Oolitic Hematite in Hubei Province

LIU Ruo-Hua, SUN Wei, LI Shan-Mei, XU Long-Hua

2011, 40(09):  116-119. 

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Briefly introduce the technological mineralogy of a refractory oolitic hematite in Hubei province.The experiment was reasearched on the ore of roasting temperature，dosage of reducing agent，roasting time and magnetic intensity.The result showed when the oolitic hematite of 47.57% iron grade was separated by reducing roasting with the roasting temperature of 850 ℃，dosage of 25% powdered carbon，roasting time of 60 min，grinding size of 65%-0.074 mm after quenching and magnetic intensity of 127.39 kA/m，the grade and recovery of iron concentration could reach to 56.75% and 79.96%，respectively.

Study on the Geological and Geochemical Characteristics of Liumei Gold Deposit in Guigang，Guangxi

LIU Chang-Jian, YUAN Jiang-Hui, ZHOU Rong-Xing

2011, 40(09):  120-122. 

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The geological and geochemical characteristics of Liumei gold deposit were comprehensively discussed.Based on the systematic sampling，the combination of gold deposit and gold associated element and its spatial distribution were studied by correlation analysis，cluster analysis，factor analysis.The results showed that the composition of the primary halo is complex in Liumei deposit.Au and As are in positive correlation relationship and As is the main indicator element of Au for ore prospecting.The metallogenic elements combination of Liumei gold deposit has feature of hydrothermal deposits.This research results play an guide in deep prospection on Liumei gold deposits.

Software Design of C#-based Infrasonic Wave Geological Disaster Monitoring System

LUO Zhao-Xia, TUO Xian-Guo, YANG Jian-Bo, YU Xiao-Ping, FENG Huai-Sheng, LI Zhe, LIU Ming-Zhe

2011, 40(09):  123-126. 

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This paper introduces a kind of auxiliary method of monitoring the geological disasters，which uses self-developed infrasonic wave to real-time monitor and warn instrument to collect device signal，then transmits it to a PC software system for data displaying，storing，and inquiring.On this basis and after the data is derived，Matlab language is used to analyze and filter the signal wavelet，and then the discrete Fourier transform is adopted to obtain the signal spectrum diagram.Through the analysis and research on the spectrum diagram，the related information of device were accessed，thus to monitor and warn the geological hazards.By tests，it is found that the system has some advantages as stable running，accurate data，high precise monitoring，and good response.

The Influence of Point Cloud Density to Accuracy of Terrestrial 3D Laser Scanning and Mining Subsidence Parameters

ZHOU Da-Wei, WU Kan, TANG Rui-Lin, ZHOU Jian-Wei

2011, 40(09):  127-130. 

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According to the theoretical formula for plane resolution，the formula for adjacent point gap（namely point cloud resolution)，which located in vertical plane and horizontal plane away different distance from the center of terrestrial 3D laser scanning，is deduced.And the formula for calculating numbers of points in unit area located in different distance from scanner is also obtained.The influence of point cloud resolution to positional accuracy and ranging precision is analyzed through experiments; Probability-integral parameters are acquired by using point cloud data of mining subsidence observation in some coal area resampling with different resolution，then analyzing the change of parameters under different resolution，The setting criterion of optimum point cloud resolution is determined to be 300 mm/100 m after contrast and anlysis.

The Application of Parallel System Theory in Modern Mine Managemnet

ZUO Min

2011, 40(09):  131-133+155. 

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Mine system is a typical complex system.It is difficult to establish mine's mathematical models through traditional modeling methods to predict and evaluate，control and management.It is presented that the parallel systems theory and the modern information technology are adopted，such as internet of things technology，cloud computing technology，and wireless communication technology，to sample the real-time data of reality system and transmit to the management center.In the management center，data-fusion，data mining and visualization technology are used to build an artificial parallel system corresponding to the reality system .Through the evolution of artificial parallel system to predict，evaluate，optimize the reality system， the optimal management of the mine are fulfilled.

Analysis on the Production Capacity of 495HR Shovel with Different Bucket Capacity

QIN Tao, CAI Qing-Xiang, ZHANG Ding, ZHOU Wei, CHEN Shu-Zhao

2011, 40(09):  134-136. 

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The paper analyzed the problems in the original 60.4 m3 Ha'erwusu coal mine 495HR shovel bucket configurationand the application effect of 52.8 m3 bucket from the capacity ratio，loading cycles and shovel productioncapacity.The small bucket was regarded to be more reasonable.Theoretical analysis showed that matching with theMT5500 truck，52.8 m3 bucket was more reasonable，and the hours of technical production and actual productionwas only decreased by 1.0% and 3.4%.Production practice showsed that，the use of 52.8 m3 bucket load cycle timecould be shortened by 6.2%，and the actual hours of production capacity was only reduced by 3.6%.Because of theimproved bucket to open fighting in reducing the weight of a load，Shovel bucket to open the number ofinstitutions and the failure time of fault were reduced by 70% and 77%，Monthly capacity increased by 4.4%.

Research on Soil Improvement-Ecological and Environmental Reconstruction in Mine Waste Dump

LU Sha, ZHANG Ruo-Meng, TANG Xiao-Ling, HU Xian-Zhou

2011, 40(09):  137-140+148. 

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Based on the actual situation of a large scale waste dump in a open pit，the suitable program for soil improvement is investigated and verified by the experiments.Vegetation planting experiments in waste dump are favorable to select crop and tree species for ecological reconstruction in early rehabilitation period，which further confirm the feasibility of soil improvement program.The research provides a reference for rehabilitation，ecological and environmental reconstruction in related mining areas.  

Comparison and Analysis of Metal and Nonmetal Mine Safety and Health Standards Between China and the United States

ZHAO Yi-Qing, TANG Liang-Yong, LI Zhong-Xue, LI Cui-Ping

2011, 40(09):  141-144+148. 

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The difference of metal and nonmetal mine safety and health standards between China and the United States is found out by comparing the background，structure and revised approach of technical indicators of metal and nonmetal mine safety and health standards between China and the United States.Then based on the comparison and the actual production of metal and nonmetal mines in China，the specific recommendations to modify them are proposed，thus providing some reference for the metal and nonmetal mine safety regulations-setting work of China in the future.

Discussion on Funds Guarantee of Land Reclamation

CUI Yan, BAI Zhong-Ke, ZHANG Ji-Dong, Wang-Jin-Man

2011, 40(09):  145-148. 

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To achieve the dynamic balance between land destruction and land reclamation and ensure that new mines don't owe debts, funds supervision is an important guarantee for land reclamation.Currently, the funds supervision system needs a restrictive and incentive dual mechanism.At first, a co-management account belonging to mine enterprises and land resources administration departments should be established, and the full funds for stage reclamation according to the investment budget in reclamation program be put into the account; Secondly, mining enterprises will prepare annual reclamation fund budget table to apply the reclamation investments after approved by the related administration department of land resources; Thirdly, the funds supervision and project acceptance work of land reclamation will be completed in phase.Meanwhile, the pre-arranged deposit of land reclamation funds for person alteration needs to be prepared.

Risk Assessment of Mine Occupational Hazards Based on AHP and Risk Matrix Method

CHEN Shun-Yu, GUO Jin-Ping, WANG Xue-Ni

2011, 40(09):  149-152+168. 

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Risk assessment of occupational hazards of underground mines is a complex and Comprehensive work.It is not only combining the characteristics of underground mine safety，but also objectively reflecting the composition of occupational hazards factors.AHP was integrated with Risk Matrix to build the risk assessment model of underground mine occupational hazard，showing occupational hazard condition of mining enterprises from all levels index and total point of view.Examples showed that the method combined qualitative and quantitative analysis and was suitable for risk assessment of occupational hazards of underground mines.

Modification of Bentonite and Analysis of Its Adsorptive Capacity

ZHANG Xiu-Ying

2011, 40(09):  153-155. 

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Organic-bentonite was prepared by using cetyltrimethyl ammonium bromide(CTMAB) as modifier.Its microstructure were characterized by XRD.The adsorption of organic-bentonite on methylene blue was studied.The results showed that the adsorptive percentage of methylene blue reached 98.69% under the condition of adsorption：thickness of methylene blue is 40 mg/L,the dosage of wastewater and organic-bentonite respective is 200 mL and 2 g，at weakly acidic and  reaction time is 40min in room temperature and weakly acidic .The performance of organic-bentonite for adsorption of the methylene blue is better than Ca-bentonite.The adsorption ability  of organic-bentonite is strong.

Reducing Roasting and a Synchronized Desulfurization to Low Intensity Magnetic Concentrate of Sulphur Tailings

SUN Hao, SUN Ti-Chang, LIU Zhan-Hua

2011, 40(09):  156-159+163. 

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With an Inner Mongolia low intensity magnetic concentrate of suiphur tailings as the sample，testing the add flux direct reduction roasting-magnetic separation.The effects of type and dosage of reducing agent，flux type and dosage，baking temperature，baking time factors on the direct reduced iron products were investigated.The results show that the combination of anthracite and CCD has a great influence on dropping sulfur effect，which can get iron grade of 93.57%，iron recovery of 70.42% and sulfur content of 0.12% for the direct reduced iron products; The combination of Huimin coal and SH has an outstanding effect on iron effect ,which can get iron grade of 94.62%，iron recovery of 82.01% and sulfur content of 0.39% for the direct reduced iron products.

Preparation of Organic Modified Red Mud Absorbent and Its Property on Phosphorus Removal

LI Ye, ZHANG Meng, ZHU Li, MA Xiao, HU Jin, ZHENG Fang-Zhao

2011, 40(09):  160-163. 

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New organic modified absorbent which its raw material was red mud and prepared by means of dipping CTMAB，and its ability to remove phosphorus was studied. The results indicated that the removal rate of phosphorus from the simulate phosphorus wastewater which the initial concentration was 5 mg/L and pH=3，can reach 90% under conditions：8 g/L of CTMAB concentration， 500 ℃ of roasting temperature and 60 min of the reaction time. According to the results the adsorption isotherm of phosphorus was established by Freundlich model. Thermodynamic analysis announced that its process was spontaneous.