Abstract
ABSTRACT Resource utilisation of metallurgical slag is of great significance to environmental protection and sustainable development of resources. In this paper, the carbothermal reduction of fayalite within copper slag was investigated, and the mechanism of CaO promoting the carbothermal reduction of fayalite was revealed. The results showed that fayalite was reduced to metallic iron and silicon dioxide. After the addition of CaO, the actual starting of reaction temperature for carbothermal reduction of fayalite is decreased from 974 °C to 950 °C. Ca2+ in CaO breaks the Si–O bond in fayalite and releases FeO, thus facilitating the reduction reaction. Excess CaO and SiO2 form calcium silicate salts with high melting points, which decrease the diameter of metallic iron particles from 346 μm to 61 μm. This study provides a theoretical and experimental basis for improving iron recovery from reduced copper slag.
Published Version
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