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研究了以氧化铝和石墨为原料真空氯化亚铝歧化法提取铝的条件,包括反应温度、预反应和冷凝器的结构。结果表明:在1643~1843 K的温度范围内,氧化铝与碳的反应程度随着反应温度的升高而提高,但铝的提取率首先随着反应温度的升高而提高,在1743 K时达到最高,继续升高反应温度,铝的提取率反而降低;氧化铝与碳进行预反应可以提高金属铝的提取率;金属铝与CO的接触面积越小、冷凝温度越低,C、Al4C3和Al2O3杂质的含量越低,这取决于冷凝器的结构。
The conditions for the aluminum extraction from aluminum chloride and graphite by vacuum aluminum chloride disproportionation were studied, including the reaction temperature, the pre-reaction and the structure of the condenser. The results show that the reaction between alumina and carbon increases with the increase of reaction temperature in the range of 1643-1843 K, but the extraction rate of aluminum first increases with the increase of reaction temperature. At 1743 K Reaching the maximum, the reaction temperature continued to increase while the extraction rate of aluminum decreased. Pre-reaction between alumina and carbon could increase the extraction rate of aluminum. The smaller the contact area between aluminum and CO was, the lower the condensation temperature was. The lower the content of Al2O3 impurities, it depends on the structure of the condenser.