Optimization of Shuanghe Coal Preparation Plant's coal slime separation system through technical transformation
Because of the failure of the high-frequency primary slime recovery screen to completely retain the oversize particles,the flotation system of the plant is caused to handle a feed with a size exceeding the top limit.The undercapacity and low efficiency of the flotation system restrict as a result the plant's overall slime separa-tion capacity.Following an analysis of the problems involved,technical transformation work is made through addition of coarse slime separation process and flotation machines.As indicated by the results of the transforma-tion work,the teetered-bed separator can work remarkably well with an organic efficiency reaching 98%,and the fine slime in the overflow of the separator can be efficiently removed using the stacked-up high-frequency vi-brating fine screen,enabling the cleaned coarse slime to see a reduction both in ash(0.23 percentage point lower than the previous figure)and moisture;The proportion of the>0.25 mm size in the flotation feed is greatly re-duced with the ash of flotation tailing rising to around 67%,up 27 percentage points on the previous figure;the yield of combined clean coal product has seen a surge from 75.40%to 78.57%;and the raw coal treatment capa-city has risen from 0.4 Mt/a to 1.2 Mt/a,allowing the plant to produce an additional clean coal product of ap-proximately 0.64 Mt a year when the plant works with a full capacity,bringing forth a favorable economic res-ult for the plant.
coal jiggingslime separationpresence of screen oversize in undersizecoarse slime separationstacked-up fine screenflotation
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