Patent ID: 9340850
Filing Date: 2016-05-17
CPC Classification: C22B,C22C,C22F,C25C,C25F,H01L

Claim Text:
1. A method of manufacturing a high purity tin, consisting of the steps of: leaching a raw material tin with an acid to obtain a tin leachate, the raw material tin having a purity of 2N to 3N level, while suspending in the tin leachate one or more adsorbents selected from the group consisting of titanium oxide, aluminum oxide, tin oxide, activated carbon and carbon to adsorb impurities and make the tin leachate a purified electrolyte, performing electrolysis at a temperature of 10-80° C. with a current density of 0.1-50 A/dm melting, which is followed by casting, the electrolytically-refined tin at a temperature of 250 to 500° C., to form an ingot, and keeping the ingot in an inert gas atmosphere or in vacuum for 6 months or longer to obtain a high purity tin having an α ray count of 0.001 cph/cm