炭素およびケイ素含有溶鉄によるクロム鉱石の還元速度

概要

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The rate of smelting reduction of top-added chromium ore with fluxes such as SiO_2, CaO-SiO_2 and Na_2B_4O_7 by liquid iron containing carbon and silicon was measured at 1400∿1600℃ under an argon atmosphere. Experiments were carried out to examine effects of initial silicon content, temperature, kind of flux additive and amount of flux addition. The rate of reduction increased remarkably with an increase of silicon content in liquid iron. It also increased with the addition of various fluxes. Na_2B_4O_7 was found to have the largest promoting effect on the reduction. When fluxes were added, it was observed that they reacted with chromium ore to form liquid slag. Therefore, it was estimated that the reduction took place mainly at the interface between slag and metal. The initial rate of reduction is not affected by the amount of fluxes addition. However, the chromium yield increased with increased amount of fluxes. The effect of temperature on the rate of reduction was significant. The apparent activation energies were about 217∿320 kJ/mol in the case of formation of liquid slag. The reduction mechanism and the rate-controlling steps were discussed, finally.
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