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美国约有一半煤炭入选煤厂洗选,其他国家入选煤量也在此数左右,井工开采的煤炭洗选百分数更大些,冶金用煤的入洗煤量则还要大些,估计占冶金用煤总量的80％左右。美国约有2000座不同厂型和
Approximately half of the coal in the United States is selected for coal washing. Other countries are also included in this number. The percentage of coal washing selected from underground mining is even greater. The amount of coal used for metallurgy is even larger, About 80% of the total amount of coal. There are about 2,000 different factories in the United States