溶融スラグ中におけるクロム鉱石の溶解および還元挙動

概要

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Experiments have been done on the smelting reduction of powdered chromite ore by graphite in the molten slag of CaO-MgO-Al_2O_3-SiO_2 system at the temperatures between 1550 and 1650℃. The dissolution of chromite grains in slag proceeded usually from the grain surface and the surface became progressively enriched in MgO and Al_2O_3. However, the slag having the composition far remote from liquidus line penetrated into the inside of chromite grain and promoted the dissolution. The reduction took place mainly at the surface of graphite grain and proceeded more rapidly in the slag with higher concentration of SiO_2 and with lower concentration of MgO. Temperature dependence of the reduction rate decreased with the increase of temperature, because of change in the rate-determining step of smelting reduction with temperature. Besides, the chromium and iron contents of slag and the oxidation state of chromium in slag were examined.
社団法人日本鉄鋼協会の論文
1989-10-01