缓倾斜中厚矿体高效采矿方法研究

以新疆哈密黄土坡铜锌矿为研究对象,针对矿山一期开采中存在的损失、贫化率较高,通风条件差等问题,提出了采用二步骤采矿法开采深部矿产资源的新方案。即矿块垂直矿体走向布置(矿体厚度≥10 m),将矿块划分为矿房和矿柱,分为二个步骤进行回采,第一步先采矿房,第二步后采矿柱。开采矿房时,采用分段矿房法回采,阶段嗣后充填;开采矿柱时,采用上向水平分层充填采矿法回采。基于FLAC3D对新方案的第二步骤开采过程进行了数值模拟,第二步骤的开采过程中顶板未出现冒落、垮塌等现象。同时经过一期及二期试验采场的工业试验验证,证明新方案具有工人工作集中、设备利用率高,矿房回采时顶板暴露面积较小、作业条件安全性较高,矿柱回采时损失极大减小、采矿成本适中等优点,其采矿回采率及贫化率分别为93.50%、7.69%,极大地提高了矿山的经济效益。

Research of Efficient Mining Method in Slowly Inclined Medium Thick Orebody

Taking the Xinjiang Hami Huangtupo Copper Zinc Mine as the research object,there exists series of problems in the first phase mining,such as high loss and dilution rate,poor ventilation. Aiming at these problems,the new scheme of two steps mining method for exploration of deep mineral resources is put forward. That is,according to the vertical direction of the ore block( thickness of ore-body is 10 m or higher) ,ore block is divided into the room and pillar. Two-step mining method is a-dopted,firstly recovering room,and then pillar;For ore room,the sublevel stoping method with subsequent backfill is used. For ore pillar,the upwards horizontal layered stoping with backfill is adopted. Based on FLAC3D ,the mining process at the second step of the new scheme is numerically simulated. At the second step of mining,there is no caving and collapse of the roof. Through industrial tests of step one and step two,it is found that the new scheme has advantages of working concentration,high utilization rate of equipment,small exposed roof area at stoping,high security in the operation,lower loss at pillar stoping,and moderate mining costs. The mining recovery rate and dilution rate were 93. 50% and 7. 69% separately. It greatly improves the economic benefits of the mine.