Method for producing calcium or calcium alloys and silicon of high purity
AssigneeExtramet S.A. Zone Industrielle
InventorsGerard Bienvenu, Dominique Dubruque
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Abstract
The method causes the deposition of calcium or calcium alloy to a cathode by electrolysis of a calcium derivative in a bath of molten salts based on calcium halides. The calcium derivative is in solution into the molten salt bath in ionic form. For producing calcium alloy, calcium is caused to deposit on a liquid metal cathode and the calcium is alloyed in situ with the metal of the cathode to form the alloy. The method enables the production at the anode of high purity metals such as graphite carbon or silicon from calcium carbide, respectively calcium silide or calcium silicon. It is also possible to obtain high purity calcium by decomposition of the alloy obtained by vacuum distillation.
Claims8
A method for producing calcium alloys and silicon of high purity, wherein the alloy is formed on a liquid metallic cathode and the silicon is formed on an anode by electrolysis of a calcium-silicon derivative in a molten salt bath comprising the calcium-silicon derivative and one or more calcium halides, the calcium-silicon derivative being in solution in the molten salt bath in ionic form.
Dependencies are inferred from the claim text.