山西某磁选铁精矿浮选脱硫试验

山西某磁选铁精矿铁品位为65.16%，S含量高达2.62%，主要铁矿物为磁铁矿，占总铁的92.23%；含硫矿物主要为磁黄铁矿和黄铁矿，分别占总硫的53.72%和45.67%，硫在粗粒级（+100目）和细粒级（-325目）的含量相对较高，超过70%的硫分布在-200目粒级。为降低该铁精矿中的硫含量，进行了反浮选脱硫试验。结果表明，试样采用1粗1精-粗选与精选尾矿合并扫选，扫选精矿返回粗选的闭路浮选流程处理，在粗选+精选丁基黄药用量为400+100 g/t、H106用量为950+450 g/t、松醇油用量为50+20 g/t的情况下，可获得铁品位为66.59%、含硫0.29%、铁回收率为91.40%的铁精矿和硫品位为22.13%、含铁52.75%、硫回收率为90.07%的硫精矿。

GIS-Based Assessment on Ecological Environment of Mining Area

To scientifically assess the ecological environment of mining area, a concept of buffer area is proposed and the plant coverage rate, soil erosion rate, water body pollution rate, geological disaster occurrence rate, and land resource occupation and destruction rate are chosen as the indexes for the assessment. The information of the ecological environment of mining area is obtained through remote sensing and assessed by means of GIS , mainly by carrying out the operations of spatial overlapping, extraction, value assignment and buffer area on the basic data layers so as to produce new spatial characters and new attribute relations. The method has the advantages of rapid calculation and strong function.