Abstract:

According to the actual condition that the concentrate ash from the flotation can’t reach the target in Shanghaimiao Central Coal Preparation Plant, size analysis date of the sample showed it was typical high ash ultra-fine slime. To simulate the deslime-flotation process, the -0.045mm was mixed partly with the +0.045mm. Compared with the roughing-cleaning process, the deslime-flotation process can also reduce the concentrate ash. However, the deslime-flotation process increased substantially the feed-proportion of the +0.045mm, and it can hardly promote the flotation of the -0.045mm. The roughing-cleaning process ensured the quality of cleaned coal, and it also promote the flotation of the -0.045mm, the recovery of cleaned coal was enhanced as well.

Key words: deslime-flotation process, roughing-cleaning process, high ash ultra-fine slime