熔盐电解法制取Al-Mg-RE三元合金

Production of Al-Mg-RE Alloy by Molten Salt Electrolysis

以MgO为原料、RECl3-KCl-MgCl2为电解质，熔盐电解法制取Al-Mg-RE三元合金。结果表明：RE是由Al直接还原得到，而Mg是由电解得到的：可制得RE含量为0-8％～1．2％，Mg含量为1％-4％的三元合金；电解温度在720℃～780℃之间，电流效率随电解温度的升高而升高，电流效率最高可达到81．3％，但超过780℃，电流效率随电解温度的升高而降低；电流密度在0．8A／cm^2时电流效率最高，过低或者过高的电流密度都可以降低电流效率；电解过程中基本上不产生Cl2。

Using MgO as starting material, RECl3-KCl-MgCl2 as electrolyte, Al-Mg-RE alloy was produced by molten salt electrolysis. It is proved that RE could be attained by direct reduction of Al, while Mg could be produced by electrolysis on cathode. The content of RE in the alloy was about 0.8wt %-1.2wt%, and the content of Mg in the alloy was 1wt%-4wt%. When electrolysis temperature changed in 720℃-780℃, the current efficiency increased with raising of the electrolysis temperature, the highest was 81.3%. However, the current efficiency was reduced if the temperature was higher than 780℃. The highest current efficiency occurred when current density was 0.8 A/cm^2, and the current efficiency was reduced if the current density was higher or lower than 0.8 A/cm^2. During the electrolysis, Cl2 could hardly be produced.