Application of the 2-stage 2-product heavy medium cyclone washing process at Jinyang Coal Washery

For optimum selection of washing process for Jinyang plant, analysis is made of the property of the raw coal feed. Analysis shows that: when clean coal is required to have an ash of 7.5%, its yield is over 60%, denoting that the coal is relatively difficult to wash; and when flotation concentrate is required to have an ash of 11.00%, its theoretical yield is 86.00% with an recovery rate of combustible matter being 95.83%, indicating the slime is easily floatable. Based on result of analysis, an optimized washing process as follows is finally applied: washing of pre-deslimed raw coal using 2-stage 2-product H.M. cyclone as primary equipment ; processing ＜0.5 mm fine coal with mechanical agitation flotation cell; and recovery of flotation concentrate using filter press.