熔盐中电解钛铁矿制备TiFe合金

Preparation of TiFe Alloy by Ilmenite Electrolysis in Molten Salt

摘要:

通过在CaCl2熔盐中电解钛铁矿制备TiFe合金，研究了熔盐电解钛铁矿的反应过程，分析了电解产物的成分及电解效率。结果显示，钛铁矿的还原经历了优先生成Fe到逐步形成TiFe2、TiFe的合金化历程，中间产物包括 CaTiO3、Fe2TiO4、TiO。反应最先生成的合金是TiFe2合金，通过Ti和TiFe2的互扩散最终转变成TiFe合金, 说明扩散是反应的控制步骤。相同电解条件下，钛铁矿较混合氧化物难电解。这是由于钛铁矿颗粒较大，其杂质是固溶到钛酸铁中的，脱氧更难，电解效率较低

Abstract:

TiFe alloys were prepared by ilmenite electrolysis in CaCl2 molten salt, and the reaction progress of the electrolysis was investigated. The composition of the electrolytic products and the electrolytic efficiency were analyzed. Results show that the reduction of ilmenite undergoes an alloying course of prior formation of Fe and gradual formation of TiFe2 and TiFe. The in-process products include CaTiO3, Fe2TiO4 and TiO. The alloy firstly formed in the reaction is TiFe2, and then it converts into TiFe alloy by the interdiffusion between Ti and TiFe2, indicating the diffusion is a control step of the reaction. Under the same electrolysis condition, ilmenite is more difficult to electrolyze than the mixed oxides. It is because that those ilmenite particles are big and the impurity is solid solutioned into the iron titanate, so deoxygenation is more difficult and the electrolytic efficiency is much lower