Aluminum electrolysis using solid cryolite/alumina crust as anode
OwnerErsan Ilgarinventor
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Abstract
A solid cryolite/alumina mixture is used as the anode in an electrolytic aluminum winning process. The mixture may be used in the form of a crust formed on the electrolytic cell.
Claims14
Method of making aluminum comprising electrolyzing a molten electrolyte mixture of alumina and cryolite in a cell comprising a cathode and an anode, wherein said anode comprises a solid cryolite/alumina electrode mixture in the form of a crust residing on top of said molten electrolyte mixture.
A continuous method of making aluminum comprising forming a mixture comprising cryolite and alumina, placing said mixture in an electrolytic cell having a carbon cathode and a solid anode, said solid anode comprising cryolite in the form of a crust residing on top of said mixture, electrolyzing said mixture to form molten aluminum, and continuously or intermittently draining or siphoning said aluminum from said cell.
Method of making aluminum comprising forming a mixture comprising cryolite and alumina, placing said mixture in an electrolytic cell having a carbon cathode and solid anode, said solid anode consisting essentially of 80-90% Na3AlF6, 2-6% Al2O3, 5-10% AlF3, up to 5% CaF, up to 4% MgF2, and up to 4% LiF in the form of a crust residing on top of said mixture, electrolyzing said mixture to form molten aluminum, and continuously or intermittently draining or siphoning said aluminum from said cell.
Dependencies are inferred from the claim text.