Thermodynamic Analysis of Carbothermic Reduction of Electric Arc Furnace Dust
Electric arc furnace (EAF) dust is a kind of secondary resource which contains multiple metallic elements, including Fe, Mn and Cr. Pyrometallurgical processes for recovering metal elements from EAF dust have been investigated for many years although they are suffered from high energy consumption due to the spinel-structured components of EAF dust. In this study, the thermodynamic analysis of carbothermic reduction of EAF dust was performed. The main components of EAF dust were magnetite (Fe3O4), hausmannite (Mn3O4) and chromate spinel (FeCr2O4). The gangue minerals were mainly composed of magnesium silicates. The thermodynamic analysis indicated that magnetite and hausmannite can be reduced to metallic iron and MnO, respectively. Meanwhile, the chromate spinel will be reduced to chromium oxide and then to form CaCr2O4. The results also demonstrated that the gangue components can promote the separation of Fe and Cr, agreeing well with the experimental results.
KeywordsThermodynamic analysis Carbothermic reduction EAF dust Ferrite
This work was partially supported by the National Natural Science Foundation of China under Grants 51774337, 51504297, 51811530108 and 51881340420, the Science and Technology Major Project of Gansu Province, China, under Grant 1602FKDC007, the Research Fund Program of Guangdong Provincial Key Laboratory of Development and Comprehensive Utilization of Mineral Resources under Grant SK-201801, the Innovation-Driven Program of Central South University under Grant 2016CXS021, the Shenghua Lieying Program of Central South University under Grant 502035001, the Natural Science Foundation of Hunan Province, China, under Grant 2017JJ3383, the Hunan Provincial Co-Innovation Centre for Clean and Efficient Utilization of Strategic Metal Mineral Resources under Grant 2014-405, the Fundamental Research Funds for the Central Universities of Central South University under Grant 2018zzts222, and the Open-End Fund for the Valuable and Precision Instruments of Central South University under Grant CSUZC201706.
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