Research on reformation scheme improving quality and efficiency for coarse slime of Datun Coal Preparation Plant
In order to further optimize the structure of clean coal products,reduce the phenomenon of heavy medium clean coal"back ash",improve the comprehensive clean coal recovery rate,and reduce the production of low value tail coal slime,quantitative testing and system diagnosis were conducted on the coarse coal slime separation and recovery system of Datun Coal Preparation Plant.It was found that the grading effect of the pit in the coarse coal slime recovery system was poor and did not play the expected role of desliming and ash reduction.The concentration effect of the slime classification cyclone significantly reduced the desliming effect of the stacked screen.At the same time,the phenomenon of the loss of coarse coal in the centrifugal liquid under the stack screen and centrifuge is more serious,resulting in the ash content of the final coarse and clean coal product exceeding the standard.A targeted process transformation plan has been proposed for this purpose,which includes repairing the pit,canceling the slime classification cyclone,and allowing the bottom flow of the salvage pit to enter the stack screen.The calculation shows that the scheme can reduce the ash content of coarse coal slime,increase the yield of heavy medium clean coal,and obtain better economic benefits.
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