C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 1/244 (2006.01)
Patent
CA 2274672
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 and then a second 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).
La présente invention concerne un procédé perfectionné d'extraction d'un métal précieux de fines minérales par lixiviation avec de l'acide sulfurique étendu comportant une étape d'agglomération des fines minérales préalablement à la formation d'un tas avec une composition d'agglomération comprenant l'ajout successif d'un premier polymère et ensuite d'un second polymère auxdites fines. Préférablement, les premiers polymères sont poly(acrylamide) et dans un rapport de pourcentage molaire 70/30 de poly(acrylamide/acrylate de sodium), et les seconds polymères sont poly(chlorure de diallyldimethylammonium), dans un rapport de pourcentage molaire 90/10 de poly(acrylamide/chlorure de diallylmethylammonium) et de 99/1 de poly(chlorure de diallylmethylammonium/vinyltrimethoxysilane).
Marks & Clerk
Nalco Chemical Company
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