Experimental study on mixed flotation of washed medium coal and primary slime
Statistical method of microscopic observation was adopted to study the dissociation law of washed coal samples under different crushing degrees,and the optimal dissociation particle size of washed coal in-depth flotation was determined according to the characteristics of washed coal ash and the form of mineral storage,the separation scheme of mixed flotation of washed coal and primary slurry was put forward and the mixed flotation test of the two with different ratios was carries out.The results show that when the washed coal sample is crushed to-0.5 mm,the monomer dissociation degree is 27.95%;when the sample is crushed to-0.125 mm,the liberation degree degree reaches 75.72%,i.e.,with the deepening of the degree of crushing,the liberation degree of the washed coal gradually tends to be better;when the mixing ratio of the selected slurry is increased from 25%to 75%,the ash content of flotation concentrate is reduced from 9.95%to 8.61%,and the ash content of tailings is reduced from 76.9%to 8.61%.The ash content of tailings is reduced from 76.6%to 8.61%.When the mixing ratio of incoming coal slurry increased from 25%to 75%,the ash content of flotation coal decreased from 9.95%to 8.61%,and that of tail coal increased from 76.52%to 78.02%.That is to say,after mixing the coal slurry,the clean coal yield increases,the fine coal ash decreases,the tail coal ash increases,and the selection indexes tend to be better,and the two mixing-flotation can realize the better separation of the primary coal slurry and the washed coal.
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