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Reduction of chromium ore by recycled silicon cutting sludge waste with carbon addition

Journal of Iron and Steel Research International 2019年第8期26卷 806-817页

作者： Woo-gwang Jung Sakib Tanvir Hossain Fatima Tuz Johra Jong-ho Kim Young-chul Chang School of Materials Science and Engineering Kookmin University Seoul 02707 Korea Department of Materials Science and Engineering Graduate School of Kookmin University Seoul 02707 Korea Advanced Metals Research Group Research Institute of Industrial Science and Technology (RIST) Pohang City 37673 Korea Department of Mechatronics Engineering Korea University of Technology and Education Cheonan-si 31253 Korea

A basic study on the feasibility of producing ferrochrome (silicon) alloys using Si sludge waste collected from the silicon ingot cutting process was carried out, and the effects of the addition of carbon components, reaction time, and reaction temperature on the silicothermic reduction of chromium ore by Si sludge were studied. The cordierite (Mg2Al4Si5O18) phase was generated in the slag, and the Fe-Cr(-Si)-C alloy was formed by the silicothermic reduction. Moreover, the addition of carbon powder lowered the reduction initiating temperature, and the reduction ratio based on the oxygen content was evaluated at around 68-88% at 1573 K, which increased with an increase in carbon. However, it was difficult to find a significant difference in the reduction behavior in response to increasing the holding time. The reduced fer-rochrome (Fe-Cr) metal alloy droplets coalesced more intensively with an increase in reduction temperature, and for manufacturing the Fe-Cr alloy, it is estimated that a temperature of 1773 K or higher is required for good separation of the slag and the metal. Furthermore, the metallization ratio was defined, and higher values are evaluated for Fe than for Cr.

关键词： Chromium ore Ferrochrome alloy Silicon sludge waste silicothermic reduction Reduction ratio Metallization ratio

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