前言由于优质炼焦煤日益减少,必须开发劣质煤层以满足冶金工业对炼焦煤不断增长的需要。劣质煤通过洗选可以获得质量合格的产品。洗选以前,为了使原煤较好地解离,需将其破碎到较细的粒度,即使变成这样细的粒度,仍有较大比例的邻近密度物,这对提高分选精度是不利的。用传统的方法,如跳汰机、块煤重介分选机等处理这些难选煤效率很低、很难获得令人满意的结果。 Preface Due to the declining quality of coking coal, inferior coal seams must be developed to meet the growing needs of the metallurgical industry for coking coal. Poor quality coal through washing can get qualified products. Before washing, in order to better dissociate the raw coal, it is required to be crushed to a finer particle size. Even if it becomes such a fine particle size, there is still a large proportion of adjacent density substances, which is unfavorable for improving the sorting accuracy . It is very inefficient to treat these difficult-to-use coal by traditional methods, such as jiggers and lignite separators, which makes it difficult to obtain satisfactory results.