Process for extracting and recovering silver

Details Process for extracting and recovering silver Process for extracting and recovering silver

1998-01-16

1999-03-23

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

75370, C22B 1100

Patent

active

058855351

ABSTRACT:
A process for extracting and separating silver safely and selectively from a raw material containing slightly soluble silver compounds and recovering silver from the extract in a simple manner without resorting to electrolysis or a special reducing agent, and further recovering high-purity silver, includes mixing the raw material with an organic solvent solution of an organophosphorus compound containing in the molecule sulfur in the form of S.sup.2- ions, thereby extracting silver into an organic phase simultaneously with dissolving the slightly soluble silver compounds, stripping the silver from the organic phase containing the extracted silver with an aqueous solution of alkali sulfite and forming a stripping solution, and reducing the stripping solution to separate silver therefrom.

REFERENCES:
patent: 3940261 (1976-02-01), Dannelly et al.
patent: 4623522 (1986-11-01), Rickelton
patent: 4721605 (1988-01-01), Brown et al

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