中低温乾留チャーを用いた炭材内装酸化鉄ペレットの作製と還元挙動の検討(熱炭素還元および部分還元焼結,焼結その4,<特集号>製銑プロセスの環境調和・資源対応力強化を目指して)

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Carbon composite iron oxide pellets intentionally including residual volatile matter (V.M.) were proposed to decrease the initial temperature for reduction reaction of carbon composite iron ore agglomerate under a rising temperature condition, such as in a blast furnace shaft. The carbonization of coal (Newcastle blend coal) under a rising temperature condition was interrupted at a certain temperature, T_<C, max>=823, 873, 973, 1073 and 1273K, to obtain semi-coal-char containing some residual V.M. Furthermore, to investigate the behavior of gas evolution from the coal char, the semi-coal-char obtained at T_<C, max(1)>=873K was heated from room temperature up to T_<C, max(2)>=1273K at 200Kh^<-1> in nitrogen atmosphere. In carbonizing at T_<C, max(1)>=1273K, V.M. was almost emitted from T_<C, max(1)>=873K. Total gas volume of two step carbonization (T_<C, max(1)>=873K and T_<C, max(2)>=1273K) almost agreed with that of one step carbonization (T_<C, max>=873K). The semi-coal-char including residual V.M. was mixed with reagent grade hematite in the mass ratio of one to four. Then, Bentonite was added to the mixture as a binder, and the carbon composite iron oxide pellets including residual V.M. were prepared and reduced under rising temperature conditions in nitrogen atmosphere. It was confirmed by the XRD analysis of the reduced pellets that the carbon composite iron oxide pellets using the semi-coal-char at T_<C, max>=823K have the fastest reducibility of the iron oxide.
社団法人日本鉄鋼協会の論文
2006-12-01

中低温乾留チャーを用いた炭材内装酸化鉄ペレットの作製と還元挙動の検討(熱炭素還元および部分還元焼結,焼結その4,<特集号>製銑プロセスの環境調和・資源対応力強化を目指して)

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