C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/00 (2006.01) C22B 3/04 (2006.01) C22B 3/12 (2006.01) C22B 3/14 (2006.01) C22B 3/44 (2006.01) C22B 19/00 (2006.01)
Patent
CA 2533024
According to the present invention there is provided a process for upgrading an ore or concentrate that contains metal sulphur minerals and gangue material. The process includes the stages of: a) selectively leaching the ore or concentrate using an ammoniacal solution containing ammonium carbonate that forms soluble metal ammine complexes; b) separating the solid and liquid phases formed in stage a) with the liquid phase forming a solution including soluble metal ammine complexes and the solid phase including at least in part the gangue material; c) removing ammonia and carbon dioxide from the liquid phase formed in step b) under conditions so as to selectively precipitate the valuable metal(s); and d) separating the solid and liquid phases formed in stage c) with the solid phase forming a more-concentrated source of valuable metal.
L'invention concerne un procédé de reconcentration d'un minerai ou d'un concentré contenant des minéraux de sulfures métalliques et une gangue. Le procédé comprend les étapes suivantes : a) lixivier de manière sélective le minerai ou le concentré au moyen d'une solution ammoniacale contenant du carbonate d'ammonium qui forme des complexes métal-amine solubles ; b) séparer les phases solides et liquides formées à l'étape a) avec la phase liquide formant une solution comprenant des complexes métal-amine solubles et la phase solide comprenant au moins en partie la gangue ; c) éliminer l'ammoniac et le dioxyde de carbone de la phase liquide formée à l'étape b), dans des conditions permettant de précipiter de manière sélective le(s) métal(aux) de valeur ; et d) séparer les phases solides et liquides formées à l'étape c) avec la phase solide formant une source plus concentrée de métal de valeur.
Bryant Sally Elizabeth
Freeman Paul Christopher
Newman Oliver Michael Griffiths
Ridout & Maybee Llp
Zinifex Limited
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