A hydrometallurgical method for leaching base metals

C - Chemistry – Metallurgy – 22 – B

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C22B 3/04 (2006.01) C22B 3/08 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2737324

A Hydrometallurgical method for leaching base metals, said method comprising the method steps of. i) combining an oxide ore material with a sulphide ore or concentrate in the presence of acid to form a slurry; and ii) leaching the slurry in a pressure acid leach (PAL) circuit to produce a leached autoclave discharge liquor, wherein the acid concentration in the slurry is sufficient to ensure some iron remains in its oxidised (ferric) form in the presence of the sulphide ore or concentrate.

La présente invention porte sur un procédé hydrométallurgique permettant de lixivier des métaux de base et comprenant les étapes consistant à : i) combiner un matériau de minerai oxydé avec un minerai sulfuré ou un concentré sulfuré en présence d'un acide pour former une pâte; et ii) lixivier la pâte dans un circuit de lixiviation acide sous pression (PAL) pour produire une liqueur résiduelle stérile lixiviée, la concentration d'acide dans la pâte étant suffisante pour garantir que fer reste sous sa forme oxydée (ferrique) en présence du minerai sulfuré ou du concentré sulfuré.

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