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目前,美国的选煤正朝着尽量提高精煤回收率、洗煤厂每日三班作业、强化细粒级煤洗选、洗水闭路循环以及黄铁矿硫脱除等方面发展。美国1975年机械洗选并经火力干燥的精煤量见附表。其中:跳汰机洗选的精煤
At present, coal preparation in the United States is moving towards maximizing the recovery rate of coal, three operations per day in the coal washing plant, strengthening the washing of fine-grained coal, the closed circuit of washing water, and the removal of pyrite sulfur. The United States in 1975 mechanical cleaning and thermal drying of the amount of coal see schedule. Of which: jig washing selected coal