Title: Protection of silver reduction materials

Abstract: Materials have been found which retard the dissolution of steel wool during reduction of silver-rich solutions to reclaim silver therein. These materials include certain amines, ammonium salts, phosphates and ethylene oxides.

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Inventors: Fisch, Richard S. (St. Paul, MN, US)

Application Number: 721533
Filing Date: 1976-09-08
Publication_date: 1977-07-12
Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)
Primary Class(es): 75/713 75/733
Other Classes:
US Patent Ref:

2214765	Sep, 1940	Holzwarth	75/118.
2221163	Nov, 1940	Barnes et al.	75/118.
2863761	Dec, 1958	Ashley et al.	75/108.
3369886	Feb, 1968	Metzger et al.	75/.
3390981	Jul, 1968	Hoffman	75/108.
3490898	Jan, 1970	Venkatakrishnan	75/98.
3666447	May, 1972	Sanbestre	75/108.
3820979	Jun, 1974	Manassen	75/108.
3961943	Jun, 1976	Schell	75/.

Other Refs:
Primary Examiner: Ozaki, G.
Assistant Examiner:
Attorney: Alexander; Cruzan, Sell; Donald M., Litman; Mark A.