Experimental Study on Enhanced Flotation Separation of Low-Rank Coal Slime with Difficulty in Selection
An experimental study on enhanced flotation separation of low-rank coal slime with difficulty in selection was conducted at the Shigetai coal preparation plant,targeting the issue of difficulty in separation of low-rank coal slime.The results show that the high content of 1.6-1.8 g/cm3 density grade particles in coal slime makes it difficult to separate.Due to the surface hydrophilicity of low-rank coal,diesel alone is difficult to improve the flotability of low-rank coal and the synergistic effect of diesel and sodium oleate can enhance its flotability.Sodium hexametaphosphate can increase the electrostatic repulsion between gangue and coal particles,and weaken the slime coating.Grinding is used to promote the separation of coal and gangue minerals and a combination reagent with 500 g/t sodium oleate,4000 g/t diesel,and 500 g/t sodium hexametaphosphate is used to enhance the flotation of low-rank coal.When the fine coal ash content is divided into 10％,the yield of fine coal can be increased to 56.95％and the selectivity index has an increase of 3.55.The application of grinding and a combination reagent of sodium oleate,diesel,and sodium hexametaphosphate can significantly improve the flotation separation efficiency of low-rank coal slime which is difficult to select.
Low-rank coal with difficulty in selectionFlotation separationTimed-releaseFlotation reagentGrinding
万方数据
维普
