兰尖铁矿露天转地下过程中矿石覆盖层回收方法试验研究

发布时间：2018-03-04 16:17

本文选题：无底柱分段崩落法　切入点：矿石覆盖层　出处：《西南科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：攀钢兰尖铁矿经过数十年的露天开采,现已经正式转入地下开采,并且采用了高效、安全的无底柱分段崩落法。与国内外许多露天转地下矿山不同的是,攀钢兰尖铁矿采用了崩落顶部分段矿石的方式形成矿石覆盖层,目前矿石覆盖层已基本形成。据初略估算,作为矿石覆盖层的矿石量达数百万吨,经济价值上亿元。然而,矿山在开采设计中并没有提及矿石覆盖层是否回收以及如何回收的问题。兰尖铁矿的矿体属于倾斜矿体,倾角在40~50°。随着回采分段的不断下移,如果不采取适当措施对矿石覆盖层进行及时回收,其将不可避免的逐步损失在矿体下盘或成为矿岩混杂层损失到地下。根据矿山不同区域矿石覆盖层的形成方式,在实验室进行相似物理模拟试验,认识了矿石覆盖层形态、厚度及组成情况,并提出了采用诱导冒落法为主的岩石覆盖层形成方法。同时,设计了无贫化、低贫化、截止品位以及按步距崩矿量的100%比例出矿方案并进行了回收模拟试验。通过对不同放矿方式试验数据进行比较分析得出,矿体中部区域采用无贫化放矿方式带来的经济效益最佳,若按照试验得出的回收率80.33%计算,则将回收157.76万吨矿石。对矿体下盘区域矿石覆盖层回收问题也进行了针对性的研究,当下盘矿石在下分段回采中没有回收机会时,应采用截止品位放矿方式进行控制;当下盘矿石在下分段回采中有回收机会时,应采用无贫化放矿方式进行控制,采用这两种放矿方式对下盘区域控制放矿后,可回收下盘覆盖层矿石85.94万吨,带来的经济效益相当可观。
[Abstract]:After decades of open-pit mining in Lanjian Iron Mine of Panzhihua Iron and Steel Co., it has been formally converted to underground mining, and has adopted an efficient and safe sublevel caving method without bottom pillar, which is different from many opencast to underground mines at home and abroad. Lanjian Iron Mine of Panzhihua Iron and Steel Co., Ltd. Formed ore overburden by subgrade ore at the top of caving. At present, ore overburden has been basically formed. According to the initial estimate, the amount of ore as ore overlay is millions of tons, and the economic value is in the hundreds of millions of yuan. The mining design of the mine does not mention whether ore overburden is recovered and how to recover it. The orebody of Lanjian Iron Mine belongs to an inclined ore body with a dip angle of 4050 掳. If appropriate measures are not taken to recover the ore overburden in time, the gradual loss of ore overburden will inevitably be lost to the ground in the ore body down or into a mixed ore bed. According to the formation mode of the ore overburden in different areas of the mine, Similar physical simulation tests were carried out in the laboratory, the shape, thickness and composition of ore overburden were recognized, and the formation method of rock overburden was put forward by using induced caving method. At the same time, no dilution and low dilution were designed. The cut off grade and the ratio of 100% to the amount of ore caving are calculated and simulated recovery tests are carried out. By comparing and analyzing the test data of different ore drawing methods, it is concluded that, In the middle part of the orebody, the best economic benefit is brought by adopting the method of no dilution drawing. If calculated according to the recovery rate of 80.33% obtained from the test, one million five hundred and seventy-seven thousand and six hundred tons of ore will be recovered. The recovery of ore overburden in the area of the lower end of the orebody is also studied. If there is no recovery opportunity in the next sublevel mining, the cutoff grade drawing method should be used to control the current disc ore, and the non-dilution drawing method should be used to control the current plate ore recovery in the next sublevel mining. Using these two ore drawing methods to control the drawing area of the footwall, 859,400 tons of overburden ore can be recovered, and the economic benefits are considerable.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD853.36

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