Deep flotation process for coal slime in Xinjulong Coal Preparation Plant
In order to fully and efficiently utilize coking coal resources,reduce the loss of fine-grained clean coal and the low ash content of tailings in flotation of the Xinjulong Coal Preparation Plant,triple flotation was adopted instead of secondary flotation.A four five-chamber flotation machine was used for the primary flotation to ensure that ash of the tailings was not below 70%;the original 4-chamber and 3-chamber flotation machines were used for secondary flotation to reduce the ash content of primary flotation clean coal,ash of the secondary flotation clean coal was below 8.5%;and the secondary flotation tailing was used as middling coal product after being concentrated and dehydrated;finally,a 3-chamber flotation machine was used for the third flotation to reduce the ash of high ash clean coal in the secondary flotation.The ash of the clean coal in the third flotation was controlled below 11%,and the tailings from the third flotation are returned to the secondary flotation as supplementary water.The insufficient capacity of the original flotation process was solved through transformation,and the flotation feed was roughened to improve its particle size composition and optimize flotation efficiency.Through the transformation,the slime ash was over 70%,and the calorific value was reduced to 1350 kcal/kg,the tailings ash was 23 percentage points higher than that before the transformation,the calorific value was 1650 kcal/kg lower,and the total clean coal yield was 1.49 percentage points higher,the yield of middling coal was 2.39 percentage points higher,while the yield of slime was 2.92 lower,creating considerable economic benefits.
coking coal flotationcoarse feeding and cuttingdeep flotationtriple flotation
NETL
NSTL
万方数据
