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《Journal of China Coal Society》 2010-01
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Effect of flux on the melting characteristics of coal ash for the Liuqiao No.2 Coal Mine

LI Ji-bing1,2,SHEN Ben-xian1,ZHAO Ji-gang1,WANG Ji-ming1(1.State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;2.Anqing Branch Co.,China Petroleum and Chemical Corporation,Anqing 246001,China)  
The effect of flux on the melting characteristics of coal ash for the Liuqiao No.2 Coal Mine in North Anhui Province(AQ) was investigated.The change of the compositions of mineral under various temperatures with the atmosphere of N2 and H2 mixture before and after adding flux into AQ was analyzed by XRD.The results show that mullite formed over 1 000 ℃ has an effect on increasing the ash fusion temperature of coal,and this is the major reason which leads to high ash fusion temperature of AQ.The coal ash fusion temperature is obviously reduced by adding calcium-based flux,magnesium-based flux and ferrum-based flux respectively.While the adding mass amount of calcium-based flux is 6.2%(coal as reference),or the adding mass amount of magnesium-based flux is 2.8%,or the adding mass amount of ferrum-based flux is 5.6%,the ash fusion temperature(TF) of AQ can be reduced to below 1 350 ℃ to meet the requirements of the shell gasifier slag-tapping process.The low temperature eutectic mixtures are easily formed between flux with aluminium silicate minerals under high temperature,which will remarkably decrease coal ash fusion temperature.
【CateGory Index】: TD84
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