Détail de la notice
Titre du Document
Thiosulfate leaching of gold : A review
Auteur(s)
AYLMORE M. G. ; MUIR D. M.
Résumé
The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold recovery options. The application to different ore types and process options have also been discussed. The thiosulfate leaching process it catalysed by copper and has several advantages over the conventional cyanidation process. Thiosulfate leaching can be considered a non-toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the decreased interference of foreign cations, high gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceous-type ores. In addition, thiosulfate can be cheaper than cyanide. The chemistry of the ammonia-thiosulfate - copper system is complicated due to the simultaneous presence of complexing ligands such as ammonia and thiosulfate, the Cu(II)-Cu(I) redox couple and the stability of thiosulfate in solution. However, by maintaining suitable concentrations of thiosulfate, ammonia, copper and oxygen in the leach solution, and consequently, suitable Eh and pH conditions, thiosulfate leaching can be made practical. Generally the thiosulfate leaching conditions reported in the literature are severe with high reagent consumption. Further investigations are required on leaching under low reagent concentrations over extended periods where reagent consumption is low. For high grade ores or refractory sulfide ores where
Editeur
Elsevier
Identifiant
ISSN : 0892-6875 CODEN : MENGEB
Source
Minerals engineering A. 2001, vol. 14, n° 2, pp. 135-174 [bibl. : 4 p.1/4]
Langue
Anglais
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