为解决原煤矸石含量大、选煤厂精煤产率低、运输和洗选成本高等问题，以小河嘴煤矿原煤为研究对象，基于原煤粒度组成和密度组成，在分析不同预排矸工艺方案优缺点的基础上，研究风选预排矸工艺对原煤进行预排矸的效果。研究结果表明：80 ~ 13 mm原煤采用FX型风选机作为预排矸主选设备，实际分选密度为1.77 g/cm³，可能偏差为0.165 g/cm³，原煤灰分从66.28%降低至44.73%，年可节约生产成本417.5万元。因此，风选工艺对炼焦煤进行预先排矸具有较大的可行性。

The problems faced by Xiaohezui Mine′s Coal Preparation Plant are high content of gangue in raw coal, low yield of clean coal and high raw coal transportation and cleaning costs. In order to fix the problems, based on analysis of size and density composition of raw coal as well as the advantages and disadvantages of different gangue preremoval schemes, a study is made on the effects that can be obtained by using the pneumatic cleaning process. Study result shows with the use of the FX air separator as the primary separator for preremoval of waste from 80 ~ 13 mm raw coal at an actual separation density of 1.77 g/cm³, the ecart probable moyen is 0.165 g/cm³, the ash of the raw coal can be reduced from 66.28% to 44.73%, and a save of operating cost amounting to 4.175 million yuan can be expected per year. It indicates that waste preremoval can more feasibly be effected by using pneumatic separation method.