C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/371
C22B 3/00 (2006.01) C22B 3/10 (2006.01) C22B 3/38 (2006.01) C22B 3/44 (2006.01) C22B 3/46 (2006.01) C22B 13/08 (2006.01) C22B 15/00 (2006.01)
Patent
CA 1202491
ABSTRACT OF THE DISCLOSURE A process is described for recovering non-ferrous metal values from a metal-containing sulphide material containing at least one non-ferrous metal selected from zinc, copper, lead, cobalt, nickel, silver and gold, as well as iron, comprising leaching the complex sulphide material under oxidising conditions in a leach stage with an acidic aqueous chloride lixiviant solution containing magnesium chloride, thereby to solubilise non-ferrous metal values in the material and to leave a residue comprising iron in oxide or hydrated oxide form and also sulphur, passing resulting non-ferrous metal-containing leach liquor to a metal recovery section including a solvent extraction stage in which non-ferrous metal values are recovered by liquid-liquid extraction using a hydrophobic organic extractant phase containing a cationic transport agent for non-ferrous metal transport, recovering from the solvent extraction stage an aqueous magnesium chloride-containing raffinate, subjecting a portion of the aqueous magnesium chloride-containing raffinate from the solvent extraction stage to high temperature hydrolysis, thereby liberating hydrogen chloride and magnesium oxide, recycling another portion of the aqueous magnesium chloride containing raffinate to the leach stage, recycling liberated hydrogen chloride to the leach stage, and passing magnesium oxide formed in the high temperature hydrolysis to the solvent extraction stage for use as neutralising agent for the cationic transport agent.
416011
Adamson David V.
Naden David
Saudi-Sudanese Red Sea Joint Commission
Stewart & Kolash Ltd
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