某锡矿缓倾斜中厚矿体的分段空场嗣后充填采矿法

华南某锡矿体由于倾角缓厚度大,构造变形复杂,矿石无法借助自重实现搬运,且顶板暴露面积大,无轨设备无法进入采场作业;同时采空区面积大,若均采用胶结充填则成本过大。针对以上问题,在采用分段空场嗣后充填采矿法的基础上,对采场中的参数进行结构优化,交替布置矿房与矿柱时,对第一步骤回采的矿柱尽量设计较小的尺寸,嗣后进行胶结充填,同时对第二步骤回采的矿房尽量设计较大的尺寸,嗣后进行非胶结充填,从而解决了矿石无法实现自重搬运、顶板管理困难以及胶结充填成本过大等问题。实践证明:改进后的方案使矿山综合生产能力提高112%,矿石贫化率降低0.5%,每年的充填费用减少540万元,提高了综合生产能力,增强了作业效率,实现了矿体开采安全、高效、经济的技术目标。

Sublevel Open Stope afterwards Back-filling Mining Method of Inclined Medium Thickness Ore-body in a Tin-mine

Due to the gentle inclination,great thickness and complex tectonic deformation in a tin ore body in southern China,the ore can not be carried out by self gravity,and trackless mining equipment can not enter the field because of large roof exposed area;Meanwhile,due to large mined-out area,costs will be too much if totally using the cemented backfilling.To solve these problems,based on the sublevel open stope afterwards back-filling mining method,the stope structure parameters are optimized.When alternately arranging room and pillar,the pillar at the first mining step is designed as small size as possible,then the mined-out area is treated by cemented filling The room at the second step is designed as large size as possible,and the mined-out area is treated by non-cemented filling.By this method,such issues as the problem of non-realization of selfweight handling,and the difficulty of governing the roof and the much cost of cemented filling,are solved.The production results showed that the new scheme makes the mine production capacity increased by 112％,ore dilution rate decreased by 0.5％,and annual reduction in costs of filling reduces 5.40 million,which improves the comprehensive production capacity,enhances the work efficiency,and realizes the technical aims of safety,high efficiency and low costs.