Economic and technical feasibility of raw coal desliming before preparation

There are lots of problems existed in slurry process in Shenhua Shendong Coal Group Co.,Ltd.,including high moisture in mixed coal,large fine slime in clean coal,frequent coal freezing in vehicle in the winter.Analyse the feasibility of desliming before preparation.To select the proper desliming technology,taking Daliuta coal preparation plant as sample,investigate the changes of slime content,materials cost and slime processing facilities before and after desliming.Classify the coal size by 25 mm and 13 mm,the benefits increase by 1.46×108 yuan and 1.07×108 yuan respectively.The results show that,these measures decrease the load of slime processing system and processing expense,simplify the technological process,improve the slack coal treatment capacity and separation precision of clean coal,the yield of commercial coal increase by 1.02 percent,the moisture of mixed coal decrease by 1.04 percent.