Effect of Coal Ratio on Preparation of Si-Ti-Fe Alloy by Carbothermic Reduction with Coal Fly Ash

With the development of electric power industry, the discharge of coal fly ash increases year by year. At present, one problem of coal fly ash is low-value utilization. The improper treatment of coal fly ash will also cause harm to air, water, and soil as well as human health. To test a process including high-value utilization and reduction of environmental pollution, a Si-Ti-Fe alloy was prepared in an intermediate frequency induction furnace by carbothermic reduction using coal fly ash as raw material. Coke was used as reducing agent. In this paper, the effect of coal ratio on metal recovery rate, composition, and microstructure was studied. The suitable coal ratio was proposed for future process development which could expand the utilization of coal fly ash.