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An electrometallurgical method for the production of calcium
AuthorLukasko, James J.
AdvisorSmith, Ross W.
Mining and Metallurgical Engineering
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An alternative electrochemical process for the production of calcium metal was developed. Other calcium production means are costly, complex, and inefficient. The method entailed an electrowinning step followed by an electrorefining operation. Calcium chloride was fed to the electrowinning cell with a potassium chloride-calcium chloriae eutectic electrolyte. The calcium was electrowon at 650 degrees Celsius into a molten tin cathode to 7. 5 weight percent calcium with 95 percent current efficiency. The resulting tin-calcium alloy served as the anode for the electrorefining cell which employed a calcium chloride-calcium fluoride fused salt as the electrolyte. Calcium metal was electrorefined at 850 degrees Celsius with a current efficiency of 85 percent. The recovered calcium metal analyzed 99.8 percent calcium, which is purer than commercial grades.
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