浅析无底柱分段崩落法提高矿石回采率

Increasing of ore recovery rate and decreasing of ore loss & dilution rate in the case of pillarless sublevel caving

针对无底柱分段崩落法在实际应用中由于矿块结构参数变化以及实际测量的累计误差,导致上、下水平回采巷道发生偏移,不能以正品字形交错布置,从而引起损失贫化加大的问题,通过改进中深孔设计和出矿方式,最大限度地降低了矿石的损失贫化,从而提高了矿石的回采率。

In the case of pillarless sublevel caving there is often occurrence of shift of upper mining tunnel and lower mining tunnel due to ore block parameter change or due to accumulated error of practical measurement, causing increase of ore loss dilution rate. To increase ore recovery rate and decrease ore loss ＆ dilution rate, the design of middle--deep borehole and ore withdrawal mode is improved, achieving satisfactory results.