微量硫黄含有 CO-CO_2 混合ガスによるウスタイトペレットの還元に伴う体積膨脹

概要

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Swelling of wustite pellets during the reduction with CO-CO_2 mixtures containing COS at low partial pressure was investigated in the temperature range from 800 to 1000℃. When the ratio P_<COS>/P_<CO> in reducing gas was lower in 10^<-2> than the equilibrium ratio between iron and iron sulphide, the abnormal swelling of pellets was observed as accompanied with the formation of fibrous iron. This range of the gas ratio was seemed to be independent of the presence of CaO and K_2O in wustite. CaO and K_2O dissolved in wustite did not directly induce the abnormal swelling, but the gaseous sulphur enhanced the abnormal swelling more greatly due to the coexistence of oxide additive in wustite. Two reasons for the favorable formation of fibrous iron induced by the gaseous sulphur were based on the sulphur adsorption on the solids. One is that sulphur diminishes the number of sites for the iron nucleation due to its adsorption at defects on wustite surface. The other is that sulphur induces upward growth of iron, inhibiting lateral growth of iron due to its adsorption on active iron surface.
社団法人日本鉄鋼協会の論文
1985-08-01