발간논문

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Vol.38, No.4, 591 ~ 599, 2000
Title
Pesearch Paper / Pyrometallurgy : Reduction Rate of Chromium Oxide in Stainless Steel EAF Slags by Carbonaceous Reductants
변기열K . Y . Byun,백영현K . Y . Byun,양재웅J . W . Yang,김용환Y . H . Kim
Abstract
Reduction rate of chromium oxide in slag phase was studied under an operating condition of EAF process. Synthetic CaO-SiO₂-Cr₂O₃ slag containing Al₂O₃, Fe₂O₃, or MgO were respectively prepared by sintering and pre-melting. STS 304 steel was melted in a graphite crucible under Ar-atmosphere by the high frequency induction furnace. The synthetic slag was placed on the steel melt and was reduced by carbon saturated melt. Reduction rates were measured by analyzing both steel and reacted slag sample. Microscopic analysis showed that chromium oxide in EAF slag existed largely in spinel form of FeO and MgO. Reduction yield was significantly increased by increasing temperature, and also decreasing basicity 1.5 to 1.0. The optimum temperature and basicity were found to be 1650℃ and 1.33, respectively. And the addition of Fe₂O₃ promoted the reduction rate considerably. Experimental results indicated that the reduction rate was controlled by the diffusion of chromium ion through the liquid slag phase at the initial stage of reduction and the activation energy for diffusion was found to be 129.79 kJ/㏖. It is worthy to note that reduction rate of chromium oxide increased by slag foaming at the later stage of reaction. It was also observed that SiC powder was far more effective than carbon powder as reductant at the initial stage of reaction.
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