Research on sedimentation characteristics of difficult settling coal slurry from Housuo mine coal preparation plant

In order to find effective sedimentation methods of difficult settling coal slurry in Housuo mine coal preparation plant,free settling test,settling test using coagulant and this test using coagulant ＆ flocculants are made on the basis of coal slurry properties. The result shows: the reason of difficult settling for coal slurry is caused by high content of clay mineral,water with small hardness and high concentration,strong electronegativity on the surface of particle; remarkable settling result of coal slurry can be improved by using coagulant ＆ flocculants,what ’s more,the best settling result is obtained at dosage of 200 mL coagulant and 9 mL flocculants,with supernatant liquor of 41. 90 NTU turbidity and initial settling velocity of 8. 13 cm/min.