NaCl-CaCl2熔盐体系中电脱氧制备金属Fe的工艺研究

Preparation of iron by electrodeoxidation in NaCl-CaCl2 molten salt system

  • 摘要: 在NaCl-CaCl2熔盐体系中采用FFC-剑桥工艺开展了Fe2O3电脱氧制备金属Fe的工艺研究。重点研究了烧结工艺和电解工艺等对熔盐中Fe2O3电脱氧过程的影响。采用SEM分析了烧结后Fe2O3的微观结构, 采用XRD分析了电解前后产物的物相组成, 得到了优化的电脱氧工艺条件为:槽电压为3.2 V, 电解时间为8 h, 烧结温度为800~900 ℃, 黏结剂用量为1.5%~2.5%和电解温度为680~722 ℃。同时, 在该熔盐体系中Fe2O3电脱氧机理为Fe2O3→Fe3O4→FeO→Fe。

     

    Abstract: The electro-deoxidation of Fe2O3 into Fe by FFC- Cambridge process was carried out in the NaCl-CaCl2 molten salt system. The powder sintering process and electrolysis process were highlighted. The microstructure of the Fe2O3 pellet after sintering, and phase composition of the products before and after electrolysis were analyzed by SEM and XRD, respectively. The optimized electro-deoxidation process conditions were as follows: cell voltage of 3.2 V, electrolysis time of 8 h, and sintering temperature of 800~900 ℃, the binder dosage of 1.5%~2.5%, and the electrolysis temperature of 680~722 ℃. At the same time, the electrical deoxidation mechanism of Fe2O3 in this molten salt system was determined to be Fe2O3→Fe3O4→FeO→Fe.

     

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