Abstract
Aluminum production by carbothermo-chlorination reduction of alumina in vacuum was investigated by XRD, SEM, EDS and thermodynamic analysis. Thermodynamic calculations indicate that AlCl(g) generated by carbothermo-chlorination process among Al 2O 3-C-AlCl 3 system should be at 1 377–1 900 K (100 Pa) and AlCl (g) will disproportionate into aluminum and AlCl 3(g) below 950–1 050 K at 10–10 2 Pa. Experimental results demonstrate that Al 4O 4C and Al 4C 3 begin to be formed by Al 2O 3-C system over 1 698 K (40–150 Pa). It is Al 4O 4C and Al 4C 3 but not Al 2O 3-C that participate in the carbothermic-chlorination reaction. Temperature for AlCl(g) generated by Al 4O 4C-AlCl 3-C, Al 4C 3-Al 2O 3-AlCl 3 and Al 4O 4C-Al 4C 3-Al 2O 3-AlCl 3-C system is 1 703–1 853 K (40–150 Pa). Aluminum metal is produced by AlCl(g) disproportionation process below 933 K. The average purity of aluminum metal reaches 95.32%, which has perfect crystallization and uniform grain size.
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