熔盐电解法制备金属钛的氧空位导电机制和阴极结构的研究

Study on the mechanism of conductivity of oxygen vacancy and cathode structure of FFC process

摘要:

熔盐电解法制备金属钛是取代高污染,高能耗的传统金属钛冶炼方法的重要工艺。但是,熔盐电解法所需时间长,效率低,是阻碍该法发展的瓶颈问题。因此,本文以提升脱氧速度为目标,首先研究了试片厚度对反应速度的影响,再配合采用量子化学方法,研究了TiO₂的导电机制。基于实验和计算结果,设计了多层阴极。多层TiO₂阴极经6 h的电解后,得到了含氧量在3 500-4 000 ppm的金属钛,且各片产物没有明显差别。相比传统的阴极制备方法,电解速度得到有效提高。并且多层阴极解决了电解速度与产量的矛盾,为熔盐电解法的工业应用提供了有益的参考。

Abstract:

The FFC process is an important method to replace the traditional titanium preparation methods that high pollution and high energy consumption. However, low efficiency and long electrolysis time hinder the development of the FFC process. Therefore, in order to improve the deoxidation rate, the effect of cathode thickness on the deoxidation rate was studies. Meanwhile, the quantum mechanics method was used to study the conduction mechanism of TiO₂. Based on the experimental and calculated results, a multi-layer cathode was proposed to improve the deoxidation rate. The titanium sponge with 3 500-4 000 ppm oxygen content was obtained after 6 h electrolysis. The electrolysis speed is effectively improved when compared to the tradional cathode. Another benefit of multi-layer cathode is to slove the problem of contradiction between deoxidation rate and production of FFC process.