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Roles of SiO2 Additive on Preparation of Ferrotitanium from Ilmenite Concentrate by Electrochemical Reduction in CaCl2 Molten Salt
JOM ( IF 2.6 ) Pub Date : 2020-10-13 , DOI: 10.1007/s11837-020-04366-3
Ganghua Ai , Yixin Hua , Cunying Xu , Jian Li , Yan Li , Juanjian Ru

The effect of the content of an SiO2 additive on the electrochemical reduction of ilmenite concentrate to prepare ferrotitanium is investigated in CaCl2 molten salt. A thermodynamic analysis of the Ti-Fe system and possible reactions has been carried out, and it demonstrated that SiO2 and FeTiO3 can be readily reduced to Si and intermediates (Fe and CaTiO3), respectively. The experimental results demonstrated that the optimal molar ratio of Ti:Fe:Si in the cathode mixtures is 1.2:1:0.2. The porous ferrotitanium with uniform particle sizes were successfully obtained by electrolysis at 1173 K with a cell voltage of 3.2 V for 2 h. The SiO2 additive plays an important role during the formation process of ferrotitanium, which is first reduced to Si and then serves as a reductant to catalyze CaTiO3 and Fe to form FeTi alloys.

中文翻译:

SiO2添加剂在CaCl2熔盐中电化学还原钛铁矿精矿制备钛铁的作用

在CaCl2熔盐中研究了SiO2添加剂的含量对钛铁矿精矿电化学还原制备钛铁的影响。对 Ti-Fe 系统和可能的反应进行了热力学分析,结果表明 SiO2 和 FeTiO3 可以很容易地分别还原为 Si 和中间体(Fe 和 CaTiO3)。实验结果表明,正极混合物中 Ti:Fe:Si 的最佳摩尔比为 1.2:1:0.2。通过在 1173 K 和 3.2 V 的电池电压下电解 2 小时,成功地获得了粒度均匀的多孔钛铁。SiO2添加剂在钛铁的形成过程中起着重要作用,它首先被还原为Si,然后作为还原剂催化CaTiO3和Fe形成FeTi合金。
更新日期:2020-10-13
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