Abstract
Carbo-thermal reduction aluminum is regarded as the future aluminum production method for its low energy consumption. A thermodynamics analysis is performed, taking the Al–C two-step model as the objective. High temperature is beneficial to the reaction efficiency, but harmful to the exergy efficiency of the first reaction (Al2O3+3C+AlCl3=3AlCl+3CO, R1). The second reaction (3AlCl=AlCl3+2Al, R2) presents an opposite pattern. An optimal reaction temperature window exists for the AlCl mediated carbon reduction method. The temperature of R1 is above 1520Kandthat of R2 is 398–798K in the optimal window. Heat recovery is significantly important in enhancing both exergy efficiency and energy consumption in actual processes. Energy consumption is reduced from 11,335kWh/t(Al) to 8063kWh/t(Al) when an ideal heat recovery is performed. Compared with electrolytic aluminum, carbothermol-chlorination reduction presents a significantly better performance in some condition. Energy consumption is 10,151and13,200kWh/t(Al) in carbothermol-chlorination reduction and electrolytic aluminum, respectively. Moreover, 67% of the exergy efficiency of the carbothermol-chlorination reduction is greater by 1.7times than that of the electrolytic aluminum.
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