Transformation of coal preparation process for Qinglongsi coal preparation plant

The products structure of Qinglongsi coal preparation plant is established by analysing coal quality of Qinglongsi mining area,screening and float-and-sink data,washability evaluation.The higher and lower limit of separation is 50 mm and 0.25 mm.After transformation,50 to 0 mm raw coal is separated by non-pressure three-product dense medium cyclone.For 1.5 to 0.25 mm coarse clean coal and coarse middlings,first recycle,then mix into clean coal or middlings,-0.25 mm fine coal is dehydrated by pressure filter.After dehydration,the fine slime can be mixed into middlings or gangue,another handing method is that,first dry part or whole fine slime,then mix into middlings.The results show that,the optimization design has great advantages.