基于多方法联合的崩落法崩矿步距优化

OPTIMIZATION OF RATE OF ADVANCE DURING ORE BREAKING OF CAVING METHOD BASED ON MULTI-METHOD JOINT APPLICATION

为准确获得大结构参数下的最优崩矿步距,以梅山铁矿为工程背景,联合应用相似材料试验方法和PFC2D软件数值模拟方法,开展18 m×20 m结构参数下崩矿步距的优化研究。基于相似材料试验,绘制出该结构参数下的放出体形态,并结合崩矿步距与矿石损失贫化的数学模型,计算得到该结构参数下的最优放矿步距为6.12 m。利用PFC2D软件对放矿步距为4.5,5.0,5.5,6.0,6.5 m共5种方案进行数值模拟研究,计算结果表明,当放矿步距为6.0 m时,矿石的回收指标最优。将相似材料试验和计算机数值模拟所得结果进行对比分析,并考虑最优崩矿步距与最优放矿步距之间的关系,最终确定该矿山在18 m×20 m结构参数下的最优崩矿步距为4.4 m。将该结果与梅山铁矿现场工业试验结果相对比,验证了该结果的正确性。

In order to get exactly optimal rate of advance during ore breaking under large structural parameters,with the background of Meishan iron mine,combining application of similar material test and PFC2D numerical simulation,the optimization of the rate of advance was discussed in this structural parameters of 18 m×20 m.Based on similar material test,the draw body morphology characteristics were drawn under the structural parameters,and combined the mathematical model of the rate of advance during ore breaking and ore loss and dilution,worked out the optimal drawing pace is 6.12 m under the structural parameters.Five kinds of drawing pace schemes about 4.5,5.0,5.5,6.0,6.5 m,were analyzed using PFC2D.The results show that when the drawing pace is 6 m,the ore recovery index is optimal.Compared the result of laboratory drawing test and numerical simulation of drawing,and considered the relationship between the rate of advance during ore breaking and drawing pace,ultimately determine the rate of advance during ore breaking under 18 m×20 m structural parameters of the iron mine is 4.4 m.Contrasting this with the result of industrial test in Meishan iron mine,the conclusion of this paper is proper.