Method for the recovery of silver value from aqueous solution

Details Method for the recovery of silver value from aqueous solution Method for the recovery of silver value from aqueous solution

1995-12-13

1998-08-04

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

B01D 1100

Patent

active

057889376

ABSTRACT:
Proposed is an efficient method for the highly selective recovery of silver value in an aqueous solution containing silver ions in a low concentration, such as depleted photographic fixing solutions, by extracting the silver ions from the aqueous phase with an organic solution containing 0,0-bis(2-ethylhexyl) hydrogen thiophosphate as an extractant solution and the silver ions contained in the extract solution are back-extracted with a hydrochloric acid solution containing thiourea. Alternatively, the silver-containing starting aqueous solution is contacted with beads of a porous resin bearing the thiophosphate compound so that the silver ions are selectively adsorbed on the resin beads and then the silver ions are leached out of the resin beads with an organic solvent.

REFERENCES:
Bromberg, L., "Dialkyldithiophosphate . . . and Performance" J. of Appl. Polymer Sci., 49, 1993, pp. 1529-1535, no month.
Bromberg, L., "Extraction chromatography with . . . dithiophosphoric acid," J. of Chromatography, 634, 1993, pp. 183-196, no month.
Handley, T., et al., "O, O--Dialkyl Phosphorodithioic Acids as Extractants for Metals," Analytical Chemistry, 34, 1962, Sep., pp. 1312-1315.
Chemical Abstracts, vol. 117, No. 12, Abstract No. 115533 (1992), Abstract only.
G. Cote et al., Chemistry and Industry, No. 22, pp. 780-784 (1986).
L. Bromberg et al., Journal of Membrane Science, 70(1), pp. 31-39 (1992).
Database WPI, AN 92-030420(1992)(abstract of JP-A-03-278802).

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