煤: coal矸: cash磚: brick煤矸石: gangue; coal gangue; coal refuses◇煤矸石磚 colliery wastes brick煤矸石利用: utilization of gangue煤矸石砂: coal gangue sand煤矸石砖: colliery wastes brick烧结煤矸石砖: fire brick of colliery waste煤矸石空心砌块: gangue hollow block矿区煤矸石堆放引起土壤重金属污染研究: study on heavy metals in soil contaminated by coal waste rock pile煤砟子: small pieces of coal
