Recleaning of coal flotation tailings desliming and floatability evaluation
REN Ruichen
CHEN Kang
WANG Guoliang
LI Caixia
ZHENG Zhongyu
DONG Jiaqi
Abstract：In order to solve the problem of large amount,low ash and high content of heterogeneous fine mud of coal flotation tailings from a coal preparation plant of Kailuan Group,desliming experiment was conducted using small taper angle hydrocyclone group installed in series of φ150 mm,φ75 mm,φ50 mm,φ10 mm.Through sequential evaluation experiment the hydrocyclone group before and after as well as all levels of the underflow coal slime were evaluated.The results show that all levels of the underflow ash are less than raw fine coal.With φb10 mm hydrocyclone,the ash difference between underflow and overflow is 11.15％;the removal rate of less than 0.015 mm high ash content fine slime is 19.73％;the ash yield of fine coal after desliming decreases 2.73％ indicating high effective of hydrocyclone group desliming.The floatability of the raw fine coal is extremely difficult-to-float;after desliming it is promoted to be difficult-to-float.The mixed underflow of φb75 mm and φ50 mm,and underflow of φl0 mm are less difficult-to-float.When ash content of cleaned coal is ll.50％ or less,the yield of the clean coal after desliming is 8.91％ higher than before (19.21％);the mixed yield of the clean coal from separating flotation is 31.48％ (12.27％ increase),which means the desliming is able to improve the flotability of fine coal.
Keywords：flotationcoal tailingsdeslimingfloatabilitysmall taper angle hydrocyclone
Publication Date：2017-01-01