矿产资源的开采和利用,在国民经济建设中占有极其重要的地位。但是,对于采用磁选工艺的选矿厂排出的铁矿尾沙如果治理不好,也会给矿区和河流下游地区带来严重的环境污染,而且在水源的区域内水土流失严重。比如山西左权县境内的5个选矿厂,由于治理措施根不上,磁选铁矿排出的尾沙得不到彻底根治,造成当地河流污染,几年前常见到的珍贵甲鱼、鲤鱼、草鱼等在污染的河道已经绝种;有益于农作物的青蛙也失去了良好的生存环境。由于尾沙下流,给下游许多村庄群众的用水造成较大困难,农业生产也受到严重影 Mining and utilization of mineral resources play an extremely important role in the development of the national economy. However, if iron ore tailings discharged from a concentrator using a magnetic separation process is not properly treated, it will cause serious environmental pollution in the mining area and downstream areas of the river, and the water and soil loss will be serious in the water source area. For example, in the five mineral processing plants in Zuoquan County, Shanxi, because the treatment measures are not at the root, the tail sand discharged from the magnetic iron ore will not be completely cured, causing local river pollution. The precious soft-shelled turtle, carp, grass carp, etc. The polluted rivers have been extinct; frogs that benefit crops have also lost a good living environment. Due to the influx of tail-water, the water supply to the masses in many downstream villages caused great difficulties, and agricultural production was seriously affected.