随着人类社会的不断进步与发展,人们对矿产资源的质与量的要求必将愈来愈高。地球上有限的资源不断地被开采,人类将要面临严重的资源短缺。世界钢铁工业每年要消耗10多亿吨铁矿石,由于大规模的工业开采, 富矿已日益减少, 贫矿的利用率迅速增加。为了充分利用我国铁矿石蟹源,1986年冶金工业部针对我国铁矿石资源的实际情况,提出“铁矿山经营参数优比研究” 的课题, 其研究重点是经营参数中的品位指标。
为节能降耗,降低选矿加工成本,增加企业经济效益,许多选矿厂都应用了预选技术,在矿石进入磨矿作业之前将混入矿石中的岩石剔除。磁铁矿石的预选,广泛采用磁滑轮和大型磁选机,我国应用预选技术的大中型磁铁矿石选矿厂已有20余家,都取得了非常显著的经济效益。
抛弃的废石混入预选精矿中,增加磨矿费用;应予回收的矿石混入尾矿中,则造成矿产资源的浪费,两方面都直接影响选矿厂的经济效益。如何优化预选工艺,改善预选作业的分选效果,实现该丢早丢、充分回收,以达到经济效益的最大化,成为摆在我们面前的一个课题。磁滑轮或大块磁选机预选作业中,由于受各方面因素的影响,选别产品中在一定程度上都存在矿石、废石相互混杂的现象
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