C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/243
C22B 21/02 (2006.01) F27B 1/02 (2006.01)
Patent
CA 1154600
Abstract of the Disclosure A method for production of aluminum by carbothermic reduction of Al2O3 in a stack-type reactor. A charge of A12O3 and C is inserted into an upper reaction zone of the reactor and reacted at an elevated temperature to form CO and a first liquid comprising A12O3 and A14C3. The first liquid is transferred to a lower reaction zone Leneath the upper reaction zone and heated form CO and a second liquid of A1 and C. A portion of the second liquid is removed, and liquid A1 is extracted therefrom. In a preferred method, A12O3 and C in the upper zone are heated by partial combustion of the C, and the lower zone is heated elec- trically. Gaseous A1 and A14C3 formed in the lower zone are reclaimed in the upper zone. Gaseous CO produced in both zones heats the A12O3 and C in the upper zone. Excess CO is removed from the upper zone and used for generation of electricity or chemical process use. Liquid A14C3 separated from the second liquid is returned to the upper zone. Production of 1.00 kg A1 requires an expenditure of 32.7 megajoules (MJ) of electrical energy, and 3.45 kg C. Total consumption of electrical energy and carbon energy equivalent is 121 MJ/kg A1, compared with 186 MJ/kg A1 using the best Bayer-Hall technology.
371696
Cochran Charles N.
Fitzgerald Nancy M.
Aluminum Company Of America
Smart & Biggar
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