96.高温熱処理時の石炭チャーと鉱物質との反応挙動

抄録

SS004 coal was heat-treated at temperatures up to 1600℃. Kaolinite disappeared at 900℃ due to its change to meta-kaolinite. At temperatures above 1200℃, mullite was observable, and at 1500℃, as mullite disappeared, β-SiC became apparent with the formation of other phases such as Al_2O_3, AlN and Si_3N_4. SiC and AlN were the major products in the coal treated under N_2 at 1600℃. The interaction between coal char and mixtures of calcium oxide, quartz and kaolinite were investigated by heating to 1600℃. Calcium oxide was gradually reduced by coal char in the temperature ranging 950-1450℃, releasing CO. CaO was carbided fast above 1450℃. As CaO coexisted with meta-kaolinite, CaO reacted with meta-kaolinite below 1200℃. The SiO_2 component in the CaO-SiO_2-Al_2O_3 compound was more readily carbided than the Al_2O_3 component. Calcium oxide exerted a strong catalytic effect on the graphitization of coal char, mainly forming the graphitic carbon at 1600℃.