Experimental Study of Removing Carbon from Coal Flying Ash by Flotation Technology

The content of unburned carbon in coal flying ash is an important index to judge its rank.The research subject of this study is the coal fly ash from a power plant in Shanxi province.Base on the analysis of the size characteristic of unburned carbon in the ash,the experiments on removing unburned carbon from ash were conducted.The results indicate that: the main size fraction appears in-0.045mm,under the condition of kerosene 12kg/t and octanol 2.0 kg/t,the ash containing carbon of 3.97% was obtained,the yield of the ash came up to 91.14%.The ash content of clean coal was 36.74%,whose net calorific power reached 5000cal/g.