Experimental study on enhancement of flotation of jig middling through in-depth grinding liberation and use of compound reagent
Recleaning of liberated coking coal middling is of great significance for the recovery of scarce cok-ing coal resource.The jig middling produce by a coking coal preparation plant under Hebi Coal and Electricity Co.Ltd.is taken as the object to conduct the experimental study on enhancement of flotation of the middling through in-depth grinding liberation and use of compound reagents.As shown by study results,with the mid-dling crushed down to a size of<0.5 mm,it contains a higher proportion of interlocked grains and lower propor-tion of suitable sizes of particles;at an optimum grinding time of 3 minutes,a maximum corresponding yield of flotation concentrate can be obtained while the yield of the<0.074 mm sizes in the ground product is as high as 66.22%;with the use of 1600 ternary collector and Q7 frother at a respective dosage of 500 g/t and 150 g/t,the optimal flotation indices can be expected;and through one roughing and one cleaning processes,the concentrate with a yield of 53.83%and an ash of 10.25%can be produced,well demonstrating the effectiveness of reclean-ing of jig middling after it is thoroughly liberated through deep grinding.
recleaning of middlingjig middlinggrinding timetype and dosage of flotation agentsgrinding+flotation processyield of concentrate
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