Progress of flotation technology for high ash and fine mud content fine coal

China is the largest country in coal production and consumption in the world.Recently,with the increase of degrees of mechanization in coal mining,the particle size of raw coal more and more finer and with high ash content,which result in big problem for separating high ash content fine coal in coal preparation industry.According to the current situation of high ash content fine coal separation,the paper presents some typical flotation technologies for separating of high ash content fine coal,also points out the direction of high ash content fine coal separation.