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本文对1000～1800°K 温度范围内的 Al—C—O 系进行了热力学分析。以稳定性标准和化学计量极限为基础,在所研究的整个温度范围内,确定了用石墨还原氧化铝的平衡条件。实验资料和计算数据表明,氧化铝和石墨反应生成碳化铝,碳化铝再还原氧化铝。在可实现的还原体系中,高温和相当小的 P_(Al) 和 P_(CO)值有利于这些反应的进行。本研究中确定的稳定的碳氧化物平衡与其它作者所断定的那些稳定反应不相符合。因此,文中报导的是对体系的动力学而不是对稳定平衡有利的那些反应。按照直接还原过程的要求,探讨了低价卤化物反应的热化学性质。验证了借生成一氯化铝以分离还原的铝的可能性。指出了这一方法在还原时是有效的,但此法在氧化铝还原工艺中尚未采用。
In this paper, the thermodynamic analysis of Al-C-O system in the temperature range of 1000 ~ 1800 ° K was performed. Based on the stability criteria and the stoichiometric limits, the equilibrium conditions for the reduction of alumina with graphite were determined over the entire temperature range studied. Experimental data and calculation data show that aluminum oxide reacts with graphite to form aluminum carbide, and aluminum carbide re-reduces aluminum oxide. In the reduction system that can be achieved, high temperature and relatively small P (Al) and P_ (CO) values favor the progress of these reactions. The stable equilibrium of carbon oxides determined in this study is not consistent with the stable reactions determined by other authors. Therefore, what is reported in the paper is the reaction to the dynamics of the system rather than to the stable equilibrium. In accordance with the requirements of the direct reduction process, the thermochemical properties of lower halide reactions were discussed. The possibility of forming aluminum chloride to separate reduced aluminum was verified. It is pointed out that this method is effective in the reduction, but this method has not been adopted in the alumina reduction process.