At present, there are two main preparation methods for industrial metallic calcium at home and abroad: electrolysis and thermal reduction. The focus is on the process, equipment and progress of vacuum distillation for preparing high-purity metallic calcium. Electrolysis and thermal reduction are chemical purification methods that are difficult to Prepare high purity metal calcium. Using industrial calcium as raw material, vacuum distillation can be used to prepare high purity metal calcium with a purity of more than 99.999% (5N).
On the basis of the previous research, the condensing temperature was further analyzed and calculated theoretically, and a metal calcium vacuum distillation purification device suitable for industrial production was designed and manufactured by itself. Experimental research on different device materials showed that the inner wall of the 304 series stainless steel tank After chromium plating, it can effectively reduce the effect of equipment material on the purification effect of metal calcium. Combined with the results of previous research, after one-step distillation test, the purity is as high as 99.99%, the active calcium content is as high as 99.5%, and the gas content is low (C< 0.002%, N<0.002%, O: 0.012%) high-purity metallic calcium.
