垂直分区与组合放矿在倾斜中厚矿体中的应用

Application of Vertical Zone and Combination Ore-Drawing in Inclined Medium-Thick Orebody

针对无底柱分段崩落法应用于倾斜中厚矿体时易出现矿石贫损大的问题,提出了垂直分区与组合放矿方案.通过物理模型进行了三组放矿实验方案,方案一采取截止品位放矿,方案二和方案三采取组合放矿.方案二与方案三的不同之处是方案三增大了下盘区段的贫化率.实验结果表明,方案一回收率最高(η=86.3%),对应的岩石混入率也最高(ρ=29.5%),方案二和方案三的回收率均达到了80%以上,但方案二的岩石混入率(ρ=18.2%)比方案一下降了11.3%.对三组实验结果进行经济评价,得出方案二为最优方案.通过采区试验,进一步验证了该方案的可行性及优越性.

To solve the problems of poor recovery and high dilution when using the sublevel caving method for inclined medium-thick orebody,a vertical zone and combination ore-drawing scheme was proposed. Three drawing tests were experimentally conducted by 3 D physical modeling,in which the complete cutoff grade drawing was used in test(1),and the combination drawing was used in test(2) and test(3), respectively. The main difference between test(2)and test(3) lied in that the dilution rate in footwall zone was increased in test(3). The tests results show that in test(1),the ore recovery rate(η = 86. 3%) and the corresponding rock dilution rate(ρ = 29. 5%) is the highest; the recovery rates of the two combination drawing tests are both up to more than 80%,but with a decreased rock dilution rate of about 11. 3%(ρ =18. 2%) compared with the complete cutoff grade drawing test. The economic evaluation on the three groups of tests show that test(2) is the optimal scheme,whose feasibility and superiority are further verified in the mine.