Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Platinum group metal
Patent
1993-02-09
1994-09-20
Langel, Wayne
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Platinum group metal
423 24, 423 99, 423 1, C22B 1100, C22B 4300
Patent
active
053487125
ABSTRACT:
It has been discovered that relatively large cyclic and open chain carbonates are extremely efficient in the selective extraction of metal ions, such as gold, silver, platinum and mercury from aqueous solution without the need for a potentially hazardous, organic solvent or use of a corrosive salt, such as NaCl. For example, 1,2-decane carbonate extracted >99.9% mercury, 99.76% gold, 97.5% silver and 79.0% platinum. The homologous 1,2-dodecane carbonate was found to extract 99.9% gold and silver from aqueous solution and 95.8% platinum. Didecyl carbonate extracted 77% gold from aqueous solution. The method of this invention is simpler than prior techniques and eliminates the need for potentially hazardous solvents (toxic, flammable and environmentally unfavorable) and corrosive additives, such as salt, NaCl, used as a salting agent in prior methods.
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W. I. Harris, et al., "The Extraction of Gold from Cyanide Solutions Using Moderate Base Polyamine Ion Exchange Resins," Reactive Polymers, vol. 17, 1992, pp. 21-27.
Marquis Edward T.
Plishka Martin J.
Bos Steven
Langel Wayne
Mossman David L.
Stolle Russell R.
Texaco Chemical Company
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