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利用铝的低价氟化物(AlF2)在高温下存在,低温下不稳定且容易分解而得到金属铝的特性,从热力学角度引入:“物质吉布斯自由能函数法”讨论在不同压力下,氧化铝、三氟化铝与还原剂碳的反应生成低价氟化物(AlF2)的条件。研究表明在常压下反应在1820K以上发生。而在真空度(即残压)为20000～20Pa时,反应在1683～1345K时就能进行,比常压下降低了137～475℃,为真空下铝的低价卤化物歧化分解炼铝提供热力学理论依据。
The use of aluminum low-fluoride (AlF2) exists at high temperature, unstable at low temperature and easily decomposed to obtain the characteristics of metallic aluminum, introduced from the thermodynamic point of view: “Material Gibbs free energy function method” discussed under different pressures, The reaction of alumina, aluminum trifluoride and reductant carbon to produce lower fluoride (AlF2) conditions. Studies have shown that reactions occur above 1820K at atmospheric pressure. When the degree of vacuum (residual pressure) is 20000 ~ 20Pa, the reaction can be carried out at 1683 ~ 1345K, which is 137 ~ 475 ℃ lower than atmospheric pressure, Thermodynamic theory basis.