| 摘要 |
In aluminum smelting by electrolysis, a double salt of KAlSO4, as a feedstock, is heated with a eutectic electrolyte, such as K2SO4, at 800.degree.C for twenty minutes to produce an out-gas of SO3 and a liquid electrolyte of K2SO4 with fine-particles of A12O3 in suspension having a mean size of six to eight microns. This is pumped into a cell with an electrolyte comprised of K2SO4 with fine-particles of Al2O3 in suspension, an anode and a porous cathode of open-cell ceramic foam material. The cell is maintained at 750.degree.C and four volts of electricity applied between the anode and the cathode causes oxygen to bubble at the anode and liquid aluminum to form in the porous cathode. A channel within the porous cathode, and the porous cathode itself, are deep enough within the cell electrolyte that the pressure head of electrolyte is enough to overcome the difference in density between the molten aluminum and the electrolyte to pump molten aluminum from the channel out of the side of the cell. The electrolyte K2SO4 is periodically bled-off to control a build-up of the material as aluminum is produced from the double salt of KAlSO4.
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