Table of Content

20 September 2016, Volume 32 Issue 09

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Uranium Ore Price Analysis and Prediction Based on Time Series Model

LIU Xiong, DAI Bi-Bo, JIANG Peng-Fei

2016, 32(09):  1-3. 

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Uranium ore price is the most important factors of the investment risk,the price forecast accurate or not is directly related to the investment success or failure.According to the uranium ore price data from 1989 to 2009,the time series mode is established based on MATLAB numerical analysis software,the comparison analysis of the prediction results of ES model and DMA model and the actual data is conducted to discuss the scientific and practicability of the time series model of several uranium ore prices,the results show that:①the greater the smoothing coefficient,the standard error of prediction is small;②among the four methods,the third-index flatness model is the best one,the calculated results of the model is basically consistent with the actual data;③under the condition that only the time series properties are considered,the uranium ore price can be gradually increasing.

Numerical Simulation of Low Dilution Ore-drawing of Non-bottom Pillar Sublevel Caving Method

WANG Chao, ZHOU Xing-Yu, ZHANG Wen-Ge

2016, 32(09):  10-14. 

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The weakness of current ore drawing by cut-off grade in non-bottom pillar sublevel caving method is analyzed,the low dilution ore-drawing method is proposed.Compared with the former method,the characteristics of low dilution ore-drawing method is the ore in the upper sublevel is reserved consciously,the large number of ore is drawn in the bottom sublevel,so,ore dilution is reduced.The method of low dilution ore-drawing method can significantly reduce the ore dilution rate during ore-drawing,at the same time the recovery rate can be lowered obviously.Take a gold mine as an example,eight eight schemes of low dilution ore-drawing are proposed.Using the value of recovery rate minus the dilution rate for the indicator, the eight schemes are compared by conducting the discrete element numerical simulation.The results show that when the top two sublevels drawing by cut-off grade with 20% dilution,and the bottom sublevel drawing by cut-off grade of 0.5 g/t, the value of recovery rate minus the dilution rate is the highest indicator.

Study of the Shape of Caving Body and Its Internal Ore-rock Moving Laws

GAO Chang-Sheng, WEN Yan-Liang

2016, 32(09):  15-17. 

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In order to solve the problem of high loss and dilution of ore by using the pillar-less sublevel caving method, the formation of caving body is numerical simulated, the shape of caving body is determined. The moving laws of the internal ore-rock of caving body is studied by monitoring particle displacement in the ore drawing process.The study results of the paper has strong guiding significance for the actual production of mine.

Optimization Selection of Blasting Parameters Based on RBF Neural Network

CHEN Qiong, 欧Hong-Ning , JIANG Qun, ZHANG Qin-Li, LIU Wei-Jun

2016, 32(09):  18-20+27. 

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In order to obtain the reasonable blasting parameters,the RBF neural network is established,which is used to optimize blasting parameters.The sample data of 8 actual mines are counted,the six influence factors(the volume weight,modulus of elasticity,compressive strength,tensile strength,friction angle and bond strength)that affect the rock mass blastability are considered,which are taken as the input factors of the RBF neural network model,and the factors(rows space,depth of holes and once consumption of dynamite)that influenced blasting parameters are taken as the output factors,so the sample parameters are conducted optimization selection,and the optimal blasting parameters are obtained.Taking the medium-length hole blasting of a mine as an example,the blasting parameters of the mine are conducted optimization selection by the RBF neural network model,the results show that the row space of holes are 1.30 m,the space of holes are 2.20 m,and the explosives consumption is 0.32 kg/t.The practical application proves that the blasting effect is good, and the blasting parameters are reasonable.

Dust Distribution Law of Super-long Roadway in the Process of Digging and Blasting

HE Guang-Hui

2016, 32(09):  21-27. 

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In order to analyze the dust migration laws and guide the design of dust control system in long-distance blasting excavation roadway,based on the 1100 excavation face in a metal mine,a 1∶1 geometric model is established to conduct the CFD simulation,to analyze the air flow field and boundary conditions.According to the model applicability and the air flow field distribution characteristics,the RNG k-ε turbulence model is selected to simulate the air flow field in 1100 excavation working face,the simulation results show the dust volume fraction in the blasting space is low than 10%,which determines that using the discrete phase model to simulate the dust unsteady movement in the blasting space is suitable.The dust diffusion law,dust sedimentation law and dust concentration changing law are obtained in the scope of 0~60 m nearby the excavation face.The results show that the dust concentration decreases when the height increases from 0.5 to 4 m,and the dust concentration distribution has a obvious demarcation in the vertical direction,along the roadway,the dust concentration firstly increases and then decreases.The dust particle with the diameters under 10 μm is evenly distributed in the space,and the sedimentation quantity shows a trend of "decrease-increase-decrease-increase" along the roadway,while for the dust particles with diameters of 10~200 μm,the sedimentation quantity shows a trend of "decrease-increase-decrease".Dust particles with diameters of 15~200 μm almost completely settle.In the early blasting operation within 5 min,the dust concentration along the roadway sh〖HJ〗arply decreased,and gently decreases with 5~50 min.The high concentration area stays within 0~40 m and dose not migrate along the roadway.The migration laws show that 10~20 m is the air dust jet vortex area which strongly affects dust diffusion,sedimentation and concentration variation.In order to investigate the precision of the simulation results,during the blasting period,the AKFC-92A Dust Sampler and the CCHZ-1000 Automatic dust detector are set up at 20 m and 25 m to detect the dust concentration.The actual measurement values are basically consistent with the simulation values,which indicates the simulation results is reliable.

Study on the Analysis the Quantitatively Method of the Stope Complex Mechanical Problem Based on MATLAB

GUO Qin-Qiang, WANG Zhe, CHEN Xiao-Li

2016, 32(09):  28-31. 

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Based on the measured data or numerical simulate results of underground mining of coal mine,taking the "beam model hypothesis" of stope roof as the research background,using the functions of curve fitting,polynomial interpolation,differential and integral calculus and solve equation of MATLAB software,the curve function of the discrete data of stope roof beam load obtained by actual measurement or numerical calculation are obtained,the distributive curve of shear and bending moment on the beam is obtained by integral operation,the shear value and bending moment value are acquired,besides that,the maximum value of shear and bending moment are calculated by using the roof value calculation method,and the location of the maximum value of shear and bending moment are also determined.The goal of the quantitative analysis of complex mechanical problems of stope roof under the nonlinear distributed loadings is achieved,which provide a more accurate method to predict roof beam damage.

Study on the Size Distribution Regularity of Bulky Material and Its Strength Variable Characteristics of Ultra-high-bench Dumping-site

ZHAO Dong-Yin

2016, 32(09):  32-36. 

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Typical spatial grading is the most apparent characteristic of the particle size of the bulk material in the ultra-high-bench dumping-site,its strength characteristics and stability are mainly controlled by the spatial distribution characteristics of the bulky blocks.So,analyzing the distribution regularity of the bulky rock in the ultra-high-bench dumping-site, and its mechanical characteristics and buckling failure mode are the determining the dumping-site Stability.The height of Zijin north dumping-site is 520 m,it belongs to the typical dumping-site with high steps.Based on the field test of the bulky material distribution of the north Dumping-site,the particle size ingredient of bulky material has been drawn up for the mechanical characteristics test. The relationship between the dumping-site strength parameters and the bulky material ingredient is thoroughly analyzed and the mechanical characteristics of the Zijin north dumping-site is determined.The study results of the paper can provide the guidelines for the development of the reasonable project plans of the dumping-site.

Comparison Application of Limit Equilibrium Method and Finite Element Shear Strength Reduction Method in Open-pit Slope Stability Analysis

JIA Zhu-Ping, ZHENG Lu-Jing, YAO Song

2016, 32(09):  37-40. 

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The basic theory of limit equilibrium method and finite element shear strength reduction method are illustrated.The stability of the west slope of a open-pit mine are analyzed by using the Slide 60 and Phase2 8.0 software,the safety factor calculated by limit equilibrium method and finite element shear strength reduction method are conducted comparison analysis.The result show that the safety factors calculated by the above two methods are very close with each other,the safety factor calculated by limit equilibrium method is 1.0,the one calculated by finite element shear strength reduction method is 1.04~1.06,they are both low than lowest safety factor (1.25),which indicated that the ground support is required.According to the above analysis results,the cable bolts are applied to reinfore the sliding face.The safety factor of the reinforced slope is 1.25~1.32,which meets the stability safety factor for the west slope of the open-pit mine.The study results of the paper show that the safety factors calculated by limit equilibrium method and finite element shear strength reduction method are in compliance with the actual engineering situation,thus,they are both can be used for the stability analysis of the other slopes in open-pit miens.

Numerical Simulation of the Law of Underground Pressure Induced by Coal Extraction Under Fault

ZHONG Yong

2016, 32(09):  41-44+56. 

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In order to analyze the underground pressure law induced by coal extraction under fault of 1111(1)fully-mechanized working face in Zhuji east mine,based on the RFPA2D-strata software,the influence of abutment pressure originated by the working face advanced on hanging wall and foot wall of fault are conducted camparative simulation analysis.The results show that under the fault condition,no matter from the top or from the footwall,the peak value of stress in front of the working face is produced,so,the impact hazard is appeared when the working face is close to the fault;the stress concentration factor and impact hazard when the working face advanced on foot wall of fault are higher than the ones induced by the working face advanced on hanging wall of fault.

Instability Deformation Reason of the Surrounding Rock of Roadway Under the Complex Geological Conditions

CHEN Chao

2016, 32(09):  45-47+52. 

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Taking the instability deformation of the surrounding rock of soft rock overhead roadway of 3209 caving working face of Shanxi tiandi wangpo coal mining Co.,Ltd as the study background,the factors of intensity of surrounding rock,in-situ stress,rock mass structural characteristics,groundwater,dip angle of rock strum,adjacent engineering,roadway shape,roadway span,construction techniques,construction quality are analyzed synthetically by adopting the analytic hierarchy process,the general ranking results of weights of the above ten factors are given to provide the theoretical basis for the controlling of the stability of surrounding rock of roadway.

Research on the Swelling Rock Roadway Stability under the Condition of Bolt-shotcrete Support

CHANG Bao-Meng, HAN Bin, LI Tao, ZHAO Jin-Tian

2016, 32(09):  48-52. 

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In order to analyze the reason of swelling rock roadway deformation,the expansion characteristics of the ore-rock in a molybdenum mine is analyzed by adopting the confining expansion rate test.Based on the Mohr-coulomb strength criterion,the axisymmetric swelling rock roadway elastic-plastic characteristics is analyzed,and the wet shotcrete+resin anchoring bolt+steel arch support method is proposed,besides that,the convergence deformation and surrounding rock movement are monitored.The study results show that the smaller of supporting force and the greater of expansion force,the greater of radius of plastic zone and the instability of swelling rock roadway;wet shotcrete + resin anchoring bolt+steel arch coupling support can effectively control the rock deformation and dramatically reduce support costs.The study results of the paper can provide the basis for the same or similar mine.

Cobalt Sulfur Recovery from Vanadium-titanium-iron Concentrate

WANG Yong

2016, 32(09):  73-77+93. 

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To comprehensive recovery of sulphur and cobalt from Panzhihua Mining Co., Ltd. production of vanadium-titanium-iron concentrate, based on the analysis of the mineralogy technological, flotation condition test, open flow experiment and the whole process experiment by the grinding method, magnetic separation and flotation method was conducted. Experimental results show that via grinding low intensity magnetic separation-magnetism sweep-one roughing three cleaning one scavenging sulfur flotation open process, sulfur-cobalt concentrate with 56.02% Fe, 30.02% S, 0.30% Co, sulfur and cobalt recovery of 16.411% and 6.15% was obtained, Desulfurization iron concentrate with iron grade of 5569%, sulfur grade of 0.284%;Recommended industrial test process is classification grinding-low intensity magnetic separation and magnetism sweep-one roughing three cleaning one scavenging sulfur flotation closed-circuit flotation coarse.

New High Efficient Adhesive Iron Concentrate Oxidized Pellets Experiment

WU Xia, PENG Xiao-Min, CHEN Yu-Hua

2016, 32(09):  78-81. 

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Magnetite concentrate oxidized pellets was prepared by application developed QTJ adhesive instead of bentonite, high quality oxidized pellet was obtained, meet the strict requirements for blast furnace smelting furnace charge. The results show that when QTJ dosage was 0.5%, high quality ball with compressive strength of more than 18 N/P of pellet, explosion temperature higher than 650 ℃ can be obtained; The preheating temperature of 1 000 ℃, the preheating time is 10 min, roasting temperature 1 250 ℃ for 12 min conditions, compressive strength of quality preheating ball is higher than 480 N/P, roasting ball compressive strength is greater than 2, 800 N/P. Compared with adding 2% bentonite pellet, finished product ball compressive strength lower, but explosion temperature increased; Two kinds of binder pellets reduction performance is basically approximate, thus QTJ adhesive can completely replace bentonite in oxide pellet production and has a good application prospect.

Beneficiation Experiment on a High Sulfur Gold Ore from Anhui

HUANG Fu-Ming-Zhu, SHENG Na, DENG Jiu-Shuai

2016, 32(09):  82-85+93. 

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Valuable elements of arsenic contain high sulfur and low grade gold ore from Anhui is gold and sulfur. In order to rationally develop and utilize the mineral resources, beneficiation test using sulfur suppression gold floating process was conducted. Using lime as sulfide inhibitor, butyl xanthate and butyl ammonium aerofloat combination reagent as collector, on grinding fineness of -0.074 mm 75%, by one roughing-three cleaning-two scavenging process, gold concentrate with 25.32 g/t Au, gold recovery of 68.52% satisfaction index was eventually obtained.

Geological Characteristics of Longchijing Cu-Fe Deposit and Prospecting Indicator in Nanling County,Anhui Province

LU Qing, ZHAO Yan

2016, 32(09):  135-140. 

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Shatanjiao ore filed is the large copper and gold ore-field that is located in the eastern part of the Tongling ore-concentrated area in Anhui province,it is also the ore filed with low degree of geological work in Tonlign ore-concentrated area.The Shatanjiao medium-sized skarn type copper deposit is mainly found in Shatanjiao ore-field,Yaojialing supper-large Cu-Au-Pb-Zn deposit,Guihuachong medium-sized Cu-Au polymetallic deposit and Longchijing small-sized Cu-Fe deposit are found gradually in Shatanjiao ore-field.Longchijing Cu-Fe deposit is located in the paraxial region of the northwest wing of Daigongshan anticline,the central region of south contact zone Shatanjiao rock mass and the eastern part of Shatanjiao Cu ore-field.Based on the geological region of the Longchijing Cu-Fe mining area,the regional geological background,deposit geological characteristics are analyzed,besides that，the deposit genesis and prospecting indicators are discussed in detail to provide reference for the prospecting work in the mining area.

Ore Fabric Characteristics and Silver Occurrence State of the Laoliwan Porphyry Silver Deposit

LI Ming, HUANG Cheng, FAN Guang-Ming

2016, 32(09):  141-144. 

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Combing with the geological investigation results and laboratory analysis results,the metallogenic geological conditions,ore-fabric characteristics and the occurrence state of silver of the Laoliwan porphyry silver deposit in Xiaoshan area,Henan province,the results show that:①the ore-bodies are mainly controlled by faults and its secondary faults,the selectively of metallogenic to surrounding rock is poor;②porphyry monzonitic granite rock mass of Laoliwan porphyry silver deposit is closely related to the mineralization in the mining area,it is the main ore-bearing rock mass;③the ore structure in the mining area is mainly for cataclastic structure and granular structure,the ore common structure are massive structure,disseminated structure and vein structure,the silver mineral composition are mainly for natural silver,sulfur,copper and silver ores,followed by silver and gold,argentite,acanthite,pyrargyrite,proustite;④the alteration type and zoning characteristics associated with mineralization of Laoliwan silver deposit are similar to the ones of Lengshuikeng porphyry silver deposit in Jiangxi province,which indicated that the prospecting potential of porphyry silver deposit in Xiaoshan area in Henan province is large.

Geological Characteristics and Genesis of Longgou Manganese Deposit in Malipo County,Yunnan Province

ZHAO Min, GAO Yong-Bao, HE Yong-Kang, CHEN Deng-Hui, YAN Zhou-Quan, LI Kan, SUI Qing-Lin

2016, 32(09):  145-148. 

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Longgou manganese deposit is located in Dounan metallogenic belt,that is the high-quality manganese ore belt in the southeast Yuannan province.The ore-bodies are located in the middle Triassic Falang formation,they are exposed with layered and lenticular shapes,which is similar with the occurrence of surrounding rock.The ore-bearing rocks are mudstone,silty mudstone interbedded with conglomeratic sandstone,fine sandstone and siliceous rocks.The sedimentary environment is littoral-neritic facies.Based on the geological working results of the mining area,the regional geological background,geological characteristics of the mining area,geological characteristics of the deposits are analyzed,and the source of manganese,sedimentary environment are discussed,the results show that the genetic type of the deposit is the littoral-neritic facies manganese deposit that is suffered the secondary oxidation transformation.The above analysis result can provide some reference for the further prospecting work of manganese deposit in the mining area.

Uranium Metallogenic Conditions of Kekeshaier Area,Qinghai Province

WANG Li-Wen, ZHAO You-Jun, BAI Qiang

2016, 32(09):  149-152. 

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The Kekeshaier area is located between the middle and south of Kunlun suture zone, Qinghai province,the tectonic magmatic activity in the area is frequent.Many uranium mineralization clues have been found in this area, the uranium metallogenic geological background is good.Based on analyzing the regional geological background,geophysical and geochemical anomalies characteristics,the geological characteristics of the uranium mineralization points,besides that,the uranium metallogenic conditions are discussed from the aspects of magmatic rocks,structure,rock veins conditions and wall rock alteration,to provide some reference for the prospecting work of uranium deposit.

Geological Characteristics and Genesis of the Hunaote Ag-polymetallic Deposit,Inner Mongolia

CHEN Guo-Feng, YU Xiu-Bin, LIU Xiao-Bo

2016, 32(09):  153-158. 

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The Huanaote Ag-polymetallic mining area is located in the late paleozoic hyperplasia belt of Jilinbaolige brigade of the palaeozoic hyperplasia of continental south-east Siberia,and it is also located in the Fe,Zn,W,Au,Pb,Cu metallogenic belt of the paleozoic and mesozoic of the middle section of Daxing'an mountains.Based on the geological working results of the Huanaote Au-polymetallic mining area,the geological characteristics of the mining area and deposits are analyzed in detail,the results show that:①the Huanaote Ag-polymetallic deposit is large medium-low temperature hydrothermal vein deposit,it is controlled by NW-direction fracture tectonic belt,it is formed in the hydrothermal activity period in the middle Triassic magmatic intrusion period;②the deposit is given priority to Ag,followed by Pb,Zn and Cu,and associated with Au,S,As,Cd,Ga and In;③the ore-body depth of the main ore-bodies of the Huanaote Ag-polymetallic deposit is more than -500 m,the buried depth of the ore-bodies is large,besides that,its paragenetic elements and associated elements are rich.Based on the above analysis results,the deposit genesis is discussed,the results show that Huanaote Ag-polymetallic is hydrothermal type deposit related to syenogranite.The above analysis results of the paper can provide some reference for the prospecting work of Ag-polymetallic deposit in the mining area.

Analysis of Commonality of the Technical Architecture of the Emergency Information Platform System of Unexpected Incidents

ZHENG Wan-Bo

2016, 32(09):  203-207+244. 

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The establish mode of emergency information platform is fixed,which is not suitable for changing of disaster situations.The structure of all levels emergency platforms are complex,the difference of the functions of all levels emergency platforms are obvious,which is not meet the requirement of connectivity.The general foundation platforms and dedicated platforms of social security,public health,natural disasters and accidents disaster are summarized.The current situation of the technical architecture of the emergency information platform in our country is analyzed to provide reference for establishing the emergency rescue command platform.

Study and Application on the Gas Outburst Hazard Elimination by Hydraulic Punching in Crossing Holes

CHEN Ke, CHENG Lei

2016, 32(09):  208-210+218. 

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Due to the low permeability,long time operation and poor effect of gas drainage for coalbeds in Xuehu coalmine,the hydraulic punching in crossing holes of floor roadway in the 2306 pannel in Xuehu coal mine is applied to improve the effect of gas drainage.The wear layer drilling holes arrangement design of hydraulic fracturing extraction is analyzed in detail from the aspects of drilling,fracturing process and fracturing anti-reflection extraction gas outburst elimination effect.The results show that the coal porosity,plasticity,moisture and water permeability are improved by the application of the hydraulic punching technique in cross-measure boreholes,besides that,the physical and mechanical properties of coal are also changed,the gas drainage rate is improved obviously.Therefore,the problems of the concentration of construction and excavation,the study results of the paper can provide the practical experience and theoretical basis for the ensuring the high yield and efficiency of coal mine.

Development of a Multiple Groove Helix Drilling Rod

TANG Da-Yong, MEI An-Ping, LEI Wan-Nian, SUN Dai

2016, 32(09):  242-244. 

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Taking the multiple groove helix drilling rod as the study example,the development process of drilling rod is analyzed in detail,the slagging discharging mechanism of multiple groove helix drilling rod is analyzed,the strength calculate and check method of the multiple groove helix drilling rod is discussed.The groove structure and processing technique of the joint are improved by conducting the site industrial test,the reliability of the drilling rod is improved.

Study on the Improving method of the Power of JWL-type III High Temperature Sensitive Emulsion Explosive

LIU Dong-Shui

2016, 32(09):  245-246+256. 

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In order to improving the power of JWL-type III high temperature sensitive emulsion explosive,the flowing measures are adopted,they are adding pipeline premixer,adjusting the content of sodium nitrate and water of the formula,adjusting the technical parameters of oil-water phase temperature,using integration of complex oil phase material.The engineering blasting results show that the power of JWL-type III high temperature sensitive emulsion explosive is improved effectively,the explosive consumption and blasting cost are reduced.