摘要
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 Al2O3-C-AlCl3 system should be at 1377-1 900K （100 Pa） and AlCl（g） will disproportionate into aluminum and AlCl3（g） below 950-1 050 K at 10-102 Pa. Experimental results demonstrate that Al4O4C and Al4C3 begin to be formed by Al2O3-C system over 1698 K （40-150Pa）. It is Al4O4C and Al4C3 but not Al2O3-C that participate in the carbothermic-chlorination reaction. Temperature for AlCl（g） generated by Al4O4C-AlCl3-C, Al4C3-Al2O3-AlCl3 and Al4OC-Al4C3-Al2O3-AlCl3-C system is 1 703-1853 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.
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 Al2O3-C-AlCl3 system should be at 1 377-1 900 K(100 Pa) and AlCl(g) will disproportionate into aluminum and AlCl3(g) below 950-1 050 K at 10-102Pa.Experimental results demonstrate that Al4O4C and Al4C3 begin to be formed by Al2O3-C system over 1 698 K(40-150 Pa).It is Al4O4C and Al4C3 but not Al2O3-C that participate in the carbothermic-chlorination reaction.Temperature for AlCl(g) generated by Al4O4C-AlCl3-C,Al4C3-Al2O3-AlCl3 and Al4O4C-Al4C3-Al2O3-AlCl3-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.
基金
Project(u0837604) supported by the Joint Funds of the National Natural Science Foundation of China and Yunnan Province
Project(20095314110003) supported by the special Research Funds of the Docter Subject of Higher School,China
