| 摘要 |
A method of producing aluminum, comprising the steps of: a) providing an aluminum reduction cell comprising a cathode (4), an anode (6) and a sidewall (2), the sidewall (2) having a thickness and comprising: i) a lining (7) consisting essentially of a material selected from the group consisting of silicon nitride, silicon carbide, titanium diboride and boron carbide, and having a density of at least 95 % of theoretical density, at least closed porosity, and no apparent porosity, and ii) an insulating layer backing the lining, b) contacting the lining with an electrolyte comprising at least 60 % cryolyte and having a temperature of between 650 ~C and 1100 ~C, and c) providing an electric current from the cathode to the anode through the electrolyte, thereby producing aluminum at the cathode, wherein the electrolyte temperature, the cryolite concentration and the thickness of the sidewall are predetermined so that the cryolite does not form a frozen crust anywhere on the lining.
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