Studies on the Ash Declining and Quality Improving of Depressant in Flotation Of Difficult Preparation of High Ash Coal Slime

• 1、School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083
• 2、School of Chemical Engineering and Technology, China University of Mining&Technology,Xuzhou 221116

Abstract：This paper has discussed the causes that give rises to the high ash content in the high ash and difficult prepared slime floatation, and introduced the mechanism and effect of depressant in the coal slime floatation. The author performed a series balance experiments under the same conditions with water glass, sodium haxametaphosphate and caustic amylum as various depressants. The result shows that sodium haxametaphosphate has the best depressant effect in them. Under the conditions that the ash of the feed is 22.87%, the does of sodium haxametaphosphate is 1500g/t, the ash of cleaning coal falls by 1.05 percentage points, and its recovery rate rises by 5.52 percentage points than the common floatation without depressants.

Keywords： mineral separation technology difficult preparation of high ash coal slime flotation depressant ash declining and quality improving