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Patent Searching and Data


Title:
LOW α-RAY EMISSION STANNOUS OXIDE AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2020/026745
Kind Code:
A1
Abstract:
The stannous oxide is stannous oxide having an α-ray emission level of 0.002 cph/cm2 or less after being heated for six hours at 100°C in air. Tin containing lead as an impurity is dissolved in a sulfuric acid aqueous solution to prepare a tin sulfate aqueous solution, and lead sulfate is precipitated in this aqueous solution and removed. A lead nitrate aqueous solution containing lead with an α-ray emission level of 10 cph/cm2 or less is added while stirring the tin sulfate aqueous solution from which the lead sulfate has been removed to precipitate lead sulfate in the tin sulfate aqueous solution which is simultaneously circulated while removing the lead sulfate from this aqueous solution. A neutralizing agent is added to the tin sulfate aqueous solution to collect the stannous oxide.

Inventors:
HIRANO HIROTAKA (JP)
YOSHIDA YOSHIHIRO (JP)
KATASE TAKUMA (JP)
Application Number:
PCT/JP2019/027463
Publication Date:
February 06, 2020
Filing Date:
July 11, 2019
Export Citation:
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Assignee:
MITSUBISHI MATERIALS CORP (JP)
International Classes:
C01G19/02; C25D21/14
Foreign References:
JP2007302496A2007-11-22
JP2014506554A2014-03-17
JP2018142078A2018-09-13
JP2019125029A2019-07-25
JP4975367B22012-07-11
JP2012218955A2012-11-12
Other References:
NAGAKURA,SABURO ET AL.: "Iwanami Dictionary of Physics and Chemistry. 5th Edition", ISBN: 4-00-080090-6, article "050 Decay constant", pages: 1287
B. NARASIMHAM ET AL.: "Influence of Polonium Diffusion at Elevated Temperature on the Alpha Emission Rate and Memory SER", 2017, IEEE, pages: 3D - 4.1,3D-4.8
See also references of EP 3831778A4
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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