Equilibrium of the 2Al(l)+AlCl₃(g)=3AlCl(g) Reaction in the Subhalide Process of Aluminium (Study of Extractive Metallurgy of Aluminium (I))

Abstract

Equilibrium constants of the fundamental reaction of aluminium subhalide process, 2Al(l)+AlCl₃(g)=3AlCl(g), were determined by the flow method using argon carrier between 1000° and 1250°C. As a result of this experiment, the equilibrium constant and the standard free energy were obtained from the following equation:
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Combining the experimental data with the previous thermodynamical values, the heat of formation and the entropy of AlCl(g) were obtained −22,250 cal/mol, 48.7 cal/mol respectively. By the use of the equilibrium constant, the reaction ratio of AlCl₃ was calculated at a reduced pressure and in argon carrier respectively.