Recovery of precious metal

Details Recovery of precious metal Recovery of precious metal

1992-03-18

1993-03-30

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

210681, 210688, 423 22, 423DIG14, 521 25, C22B 1104

Patent

active

051980215

ABSTRACT:
An improved process for recovery of precious metals such as gold or silver using novel ion exchange resins having aryl guanidyl functionality from aryl guanidine compounds having a pKa at 25.degree. C. less than 13 and preferably less than 12. The resins have improved elution properties compared to known guanidine reagents using caustic eluant solutions, particularly improved eluant solutions such as a mixture of sodium hydroxide and sodium benzoate.

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patent: 4992200 (1991-02-01), Lin et al.
patent: 5028259 (1991-07-01), Lin et al.
patent: 5073354 (1991-12-01), Fuller et al.
"Selectivity Considerations in the Amine Extraction of Gold From Alkaline Cyanide Solutions", M. B. Mooiman and J. D. Miller, Minerals and Metallurgical Processing, Aug. 1984, pp. 153-157.

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