苏联每年排出的采煤和选煤废矸石有22亿多吨,其中19亿吨为露天开采的剥离煤矸石,1.3亿吨为地下开采的井下煤矸石。大部分煤矸石有机物含量很少,有机碳C_有不大于2—4％,其性质和普通的矿物原料无异。每年大约有5000—7000万吨采矿煤矸石和超过1.2亿吨的选矿煤矸石的有机碳含量大于4％,属于含燃料的原料。选矿煤矸石又分为重力选矿煤 There are over 2.2 billion tons of coal and coal preparation waste discharged from the Soviet Union each year, of which 1.9 billion tons are stripped of open-pit coal gangue and 130 million tons of underground gangue mined underground. Most coal gangue organic content is very small, organic carbon C_ not more than 2-4%, its nature and ordinary mineral raw material is no different. Each year, about 50-70 million tons of coal gangue and more than 120 million tons of coal gangue contain more than 4% organic carbon, which is a fuel-containing raw material. Dressing coal gangue is divided into gravity dressing coal