Experimental research on fine coal desulfurization by the efficient centrifugal gravity separator

Abstract

It is very difficult to remove sulfur and ash from fine coal. The froth flotation is not efficient in desulfurization because of the low rate of sulfide liberation from raw coal, the natural hydrophobicity caused by sulfur concentration on the surface of sulfide, and the presence of large amounts of middling feed. An efficient centrifugal gravity separator was employed to remove sulfur and ash for Xin-wen -0.5mm high sulphur coal experiment, the partition curve of centrifugal separator was obtained with conclusion that the Ecart probable error value of the separator is 0.095, the imperfection I value is 0.128. Finally, comparing with the coal flotation using progressive release method, the result shows that the effect of the desulfurization with centrifugal gravity force field based on density difference between coal and minerals are much better than that of the floatation which operates based on the difference in surface properties. It provides a new technical way for the desulfurization of high sulfur fine coal.