小官庄铁矿生产矿块结构参数的试验分析

Experimental Analysis of Constructional Parameters of Nugget Mining in Xiaoguanzhuang Iron Mine

随着小官庄铁矿开采深度的增加,为降低采矿成本其分段高度由原来的10m加大到12.5m·为确定与分段高度相对应的进路间距和放矿步距,对小官庄铁矿分段高度加大到12.5m后的结构参数进行了实验室模型实验·根据实验结果,采用回归分析方法,应用Matlab编程,求出了矿石回收指标岩石混入率、回收率、纯矿石回收率与放矿步距、进路间距之间的关系,并对小官庄铁矿结构参数提出了建议,即综合考虑各项矿石回收指标后认为最优的进路间距、放矿步距参数为12.5m×5～6m·

With the mining depth of increased, the sublevel height was increased correspondingly to 125?m from 10?m so as to decrease mining cost. A 3dimensional model experiment was therefore carried out in lab with the intention of determining such constructional parameters as drift intervals and drawing pace to meet the mining requirements after the sublevel height has been up to 125?m. The experimental data were processed through regression analysis, and the regression equations were solved using Matlab programming to express the relationships between drift interval/drawing pace and the rate of ore recovery/rate of rock dropin/rate of undiluted ore recovery. Then, based on such relationships, some suggestions are put forward for the constructional parameters of nugget mining in the mine area, i.e., the optimum combination of drift interval with drawing pace is 125?m×5～6?mafter an overall consideration of various ore recovery indices.