焼結鉱の Ar-CO-H_2 混合ガス中昇温還元におよぼす H_2 濃度の影響

概要

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Iron ore sinter was reduced in a graphite crucible with Ar70%-(CO+H_2)30% gas mixtures and the effect of addition of H_2 gas to Ar-CO gas mixtures on reduction was investigated during heating at constant rates. The process was followed by gas analysis. Apparent reduction rates with CO, H_2 gases and C, and overall rate as the sum of those rates were separately calculated from the mass balances of oxygen and carbon. The reduction rate increased with addition of H_2 gas, especially at the temperatures below 1100℃, and the smelting reduction above 1280℃ decreased. The overall rates of reduction with Ar-CO-H_2 gas mixture were computed assuming the additivity for the reductions with CO and H_2 gases. Then, it was found that there were negative deviation from additivity about 450-600℃ and positive one in the range of 600-800℃. The extraneous effects were attributed to the direct reaction of iron oxide with CO gas and C promoted by H_2 gas addition. It was also concluded that water-gas shift reaction played at least no important role in accelerating the reduction.
社団法人日本鉄鋼協会の論文
1987-09-01