Problem analysis and optimization test for separation process of coal slime classifying flotation

Abstract

This paper tried to solve problems caused by industrial application of "2+2" mold coal slime classifying flotation system. The inefficiency of equipment and ambiguity of particle size will cause insufficient in-material of first flotation and overload in-material of second flotation. Technology of classifying hydrocyclone or sieve bend series has been applied in the process of classification, and flotation column in second flotation. A series of tests combined with practical application were conducted to verify the technology mentioned above. The result shows that ambiguity of particle size are acceptable if coarse and fine particle are separated by subsequent equipments, and application of classifying equipment such as sieve bend and classifying hydrocyclone, which is more flexible in operation, are also employed in the process of classifying flotation; If we focus on recovery rather than separation after separating coarse slime, classification particle size should be accurate, thus efficient classifying equipments like sieve bend series should be applied. At the same time, in order to eliminate the effect of fine slime, desliming of coarse slime should also be considered. With high yield, low ash content and improved perfection index, flotation column as equipment of second flotation shows great advantages comparing with regular flotation machine.