Abstract
High-purity K3NaMgCl6 was synthesized from magnesia.The factors affecting the purity of K3NaMgCl6 were investigated. The hygroscopic property of K3NaMgCl6 was studied. The preparation process of K3NaMgCl6 was investigated by X-ray diffraction analysis and differential scanning calorimetry analysis, and the reaction mechanism involved was determined. Then, magnesium metal was prepared by an electrochemical method using K3NaMgCl6 as raw material. The electrolytic parameters were measured, and the electrochemical behavior of magnesium ion in K3NaMgCl6 molten salt was investigated. Magnesia content in K3NaMgCl6 achieved 0.02 wt % under the optimum conditions. K3NaMgCl6 had a lower hygroscopy at room temperature and had a lower tendency to hydrolyze at high temperature. The purity of the obtained magnesium metal was 99.4 wt %, and the current efficiency in the electrolysis process was 94.8%.
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