Metal and tin alloy having low alpha-ray emission, and method for producing same

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United States of America Patent

PATENT NO 12000020
APP PUB NO 20230085708A1
SERIAL NO

17991018

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Abstract

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Any metal having a low α-ray emission, the metal being any one of tin, silver, copper, zinc, or indium, wherein an emission of an α-ray after heating the metal at 100° C. in an atmosphere for six hours is 0.002 cph/cm2 or less. Any metal of tin, silver, copper, zinc and indium each including lead as an impurity is dissolved to prepare a hydrosulfate aqueous solution of the metal and lead sulfate is precipitated and removed in the solution. The lead sulfate is precipitated in the hydrosulfate aqueous solution by adding a lead nitrate aqueous solution including lead having an α-ray emission of 10 cph/cm2 or less to the hydrosulfate aqueous solution, from which the lead sulfate has been removed, and, at the same time, the solution is circulated while removing the lead sulfate to electrowinning the metal using the hydrosulfate aqueous solution as an electrolytic solution.

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Patent Owner(s)

Patent OwnerAddress
MITSUBISHI MATERIALS CORPORATION2-3 MARUNOUCHI 3-CHOME CHIYODA-KU TOKYO 100-8117

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hirano, Hirotaka Sanda, JP 18 51
Katase, Takuma Sanda, JP 16 14
Yoshida, Yoshihiro Sanda, JP 116 915

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