METHOD FOR PRODUCING CALCIUM OR CALCIUM ALLOYS WITH HIGH PURITY

摘要

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 silicide or calcium silicon. It is also possible to obtain high purity calcium by decomposition of the alloy obtained by vacuum distillation.