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一、前言四川、新康两个大矿在大规模开采石棉中,年产矿石量200多万吨,含棉品位2～3%,经粗选后石棉得到富集,含棉品位提高到3～5%,每年进入选矿厂的粗精矿达100万吨左右。这100万吨粗精矿经破碎筛分提取4.5万吨石棉后,其余占95%以上(约95.5万吨)都当作废石尾矿排入南桠河、大渡河中,严重地污染了河水。据了解,五十
I. INTRODUCTION In the large-scale asbestos mining, two large mines in Sichuan and Xinkang have an annual output of more than 2 million tons of ore and 2 to 3% of cotton grade. Asbestos is enriched after roughering and the grade of cotton-containing cotton is raised to 3 ~ 5%, each year into the concentrator ore concentrate reached 1000000 tons. After the 1million tons of coarse ore concentrate was crushed and sieved to extract 45,000 tons of asbestos, the remaining 95% (about 955,000 tons) were discharged as waste rock tailings into the Nanfang River and Dadu River, seriously polluting the river. It is understood that fifty