| Gently inclined medium thick orebody due to the inclination of the slow crushing,haulage difficult,ore rock crusher,can not achieve large structural parameters of mining,it has long been used mainly layering method approach and mining method,low productivity,production organization complexity,poor security.In this paper,Jiaojia gold background for the engineering study,with the help of physical simulation and numerical simulation tools,combined with the actual experimental stope recovery,carried gently inclined medium thick ore crushing loss in experimental studies of depleted ore deep down,ore loss and dilution position,quantity and process for ensuring the smooth implementation of this type of mining method is significant.Firstly,Jiaojia gold ore body technical features,by comparison and demonstration programs,in order to increase production capacity and production efficiency as the goal,based on rock falling theory,deep down in the footwall ore mining sub-two-minute drill Lane segment fill mining method.With the physical simulation tools based on the best principles of ore recovery,optimization step Mined ore field next to the rim hole angle and step away from the ore,to establish a relationship between the magnitude of the mine through veins and ore loss spacing between indicators,inquiry Different compaction,lower rim wall friction coefficient of dispersion flow.With the recovery of ore next to the rim hole angle increases was first and then decrease trend,while the greater dispersion of compaction,high recovery of ore,ore pitches no effect on the ore recovery.Consider step footwall ore mining dilution and losses design,combined with physical simulation results to determine under 40 ° angle to the rim hole design optimal value,and the pulse spacing wear mine 6m,ore loss rate of 19.2%,poor rate of 1.99%,when the mine through pulse spacing 7.5m,the loss rate 23.44%,1.97%dilution rate.Under field conditions support,6m approach to meet the mine through spacing between pulse columns stability requirements,it can be widely applied.Currently industry study,under 50° angle to the rim holes,6m spacing ore veins through consistent form and position of ore loss and physical experiments were designed and ore loss rate of 33.95%,waste rock mixed with 5.5%,a comprehensive analysis of the actual blasting super Less dig dig,three-dimensional model mining empty area and physical simulation of statistical indicators,the computing industry test ore loss was 38.2%,5.4%mixed waste rock,lean loss indicators,the proposed mining applications under real rim hole 40 ° angle,in order to achieve economic recovery.By measuring the two-step under cover rock mining multiport wall,while more ore mine mouth to release the disc under unstable conditions surrounding rock caving continuous mixed waste rock and ore loss and discharge stone in the form of a funnel shape body,revealing.PFC2D numerical simulation using the means of analyzing the particles in the process of evolution of the set flow state power chain,displacement and velocity fields,etc.,reveal mixed ore granular process and ore loss mechanism,overall,numerical simulation and physical properties compared with the experimental result Okay.Step Mined ore field and release the body,loose body development mainly along the wall on the disc,the larger the aperture angle of the footwall side,the higher ore recovery,extremes inclination of 50 °,the recovery rate as the footwall side wall friction coefficient It increases until stable.Two-step decentralization of ore mining cover rock,ore-section a v-shaped rock handover,the apex along the rim wall to put the move,in the form of ore export losses include upper and lower rim wall residues and ore veins through the ends of the triangle remains.Through these studies,on the one hand be able to promote the use of Jiaojia gold in the deep sub-sub-mining program process,proper arrangement of residual ore recovery project to provide a reference,statistical indicators of ore loss and dilution under different conditions to optimize stope structure parameters.On the other hand,findings reveal the disc is not stable in gently inclined thick broken ore mining loss and dilution mechanism works for similar orebodies deep down the mine safe,innovative and efficient mining techniques provide a theoretical basis. |
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