ステンレス鋼精錬スラグの再資源化および廃熱回収システムの開発

概要

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This paper proposes a new system for the simultaneous detoxification and thermal recovery of stainless steel refining slag in which hexavalent chromium contained in the slag is reduced to trivalent chromium by a reducing gas. The reducing gas was obtained by recovering the waste heat of molten slag. In the experiment, the properties of the hexavalent chromium leached from stainless-steel refining slag that is treated in oxidizing and reducing atmospheres at various temperatures was investigated. The results showed that the amount of hexavalent chromium leached decreased for treatment at over 1173 K in oxidizing and reducing atmospheres. Furthermore, the heat recovery system for producing the reducing gas was analyzed, in which a heat and material balance model predicted all the operating data of the system based on the actual operation, and then energy analysis based on the predicted data was conducted to validate the system theoretically. The results showed that the proposed system can potentially produce 3.9 billion Nm^3 of hydrogen per year, and it reduces the energy consumption to 65.8% of that of the conventional method.報文Original Paper
東北大学の論文