第一讲已谈到煤中含有杂质,在用煤之前必须经过洗选,除掉煤中的有害杂质,才能达到用户的要求。这种除掉煤中有害杂质的过程称之为选煤过程;完成除掉煤中有害杂质的企业称之为选煤厂。在选煤厂里,对煤进行一系列物理加工的方法称之为作业。对煤进行实际加工时,煤、 The first talk has talked about coal containing impurities, before using coal must be washed, remove the harmful impurities in the coal, in order to meet the user’s requirements. This removal of harmful impurities in the coal process is called the process of coal preparation; to complete the removal of harmful impurities in coal enterprises called coal preparation plant. In coal preparation plants, a series of physical processes for coal are called operations. The actual processing of coal, coal,