固体炭素によるFeCr2O4およびMgCr2O4の溶融還元機構

下尾 聰夫, 酒井 泰

doi:10.2320/jinstmet1952.54.3_307

The mechanism of the smelting reduction of FeCr₂O₄ and MgCr₂O₄ by graphite has been investigated. The reduction rate has been measured by means of thermogravimetry under an argon atmosphere at 1873 K using 50%CaO-50%SiO₂ binary slag and 30%CaO-30%SiO₂-20%Al₂O₃-20%MgO quaternary slag, and the dissolution of the oxide particles has been examined by microscopic observation and chemical analysis. In the smelting reduction of FeCr₂O₄, the reduction of FeO component precedes that of Cr₂O₃. Fe-Cr-C alloy adheres poorly to the graphite and is spheroidized. In the experiment with the binary slag, the division of FeCr₂O₄ particles by slag attack increases markedly the reduction rate. The low solubility of chromite in the quaternary slag leads to the moderate attack and to the slower reduction. Fe-Cr-C alloy is finely distributed in the unreacted particles, too. MgCr₂O₄ particles are attacked severely by the quaternary slag and are divided the much smaller ones in the early stage of the reaction. The slag wets immersionally the graphite on which the carbide layer is formed. These situations are favorable for the reduction. The retard of the reduction of MgCr₂O₄ in the binary slag is contributed to a lack of the wetting of the slag to the graphite and the resistance of MgCr₂O₄ to slag attack.

固体炭素によるFeCr<SUB>2</SUB>O<SUB>4</SUB>およびMgCr<SUB>2</SUB>O<SUB>4</SUB>の溶融還元機構

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