Title:
低α線放出量の金属又は錫合金及びその製造方法
Document Type and Number:
Japanese Patent JP6512354
Kind Code:
B2
Abstract:
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/cm2or 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/cm2or 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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Inventors:
Hirotaka Hirano
Yoshihiro Yoshida
Takuma Katase
Yoshihiro Yoshida
Takuma Katase
Application Number:
JP2018142195A
Publication Date:
May 15, 2019
Filing Date:
July 30, 2018
Export Citation:
Assignee:
Mitsubishi Materials Corporation
International Classes:
C25C1/14; C22B11/00; C22B15/14; C22B19/32; C22B25/08; C22B58/00; C25C1/12; C25C1/20; C25C1/22
Domestic Patent References:
| JP201757451A | ||||
| JP201674969A | ||||
| JP2014169502A | ||||
| JP2017510706A | ||||
| JP2011214040A |
Foreign References:
| WO2012120982A1 |
Attorney, Agent or Firm:
Masayoshi Suda
Akira Murasawa
Akira Murasawa