Polymeric combinations used as copper and precious metal heap le

Details Polymeric combinations used as copper and precious metal heap le Polymeric combinations used as copper and precious metal heap le

1997-10-17

1998-11-10

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 29, 75723, 75772, C22B 1100, C22B 1500

Patent

active

058339370

ABSTRACT:
An improved method for extracting a precious metal from mineral fines by heap leaching with dilute sulfuric acid which comprises agglomerating the mineral fines prior to formation into a heap with an agglomerating agent composition comprising sequential addition of a first polymer selected from the group consisting of anionic and nonionic water-soluble polymers and then a second cationic water-soluble polymer to the fines. Preferred first polymers are poly(acrylamide) and 70/30 mole percent poly(acrylamide/sodium acrylate), and preferred second polymers are poly(diallyldimethylammonium chloride), 90/10 mole percent poly(acrylamide/diallyldimethylammonium chloride) and 99/1 mole percent poly(diallyldimethylammonium chloride/vinyltrimethoxysilane).

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