C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/06 (2006.01) B01D 61/44 (2006.01) C22B 3/20 (2006.01)
Patent
CA 2099333
- 32 - CHLORIDE ASSISTED HYDROMETALLURGICAL COPPER EXTRACTION ABSTRACT OF THE DISCLOSURE A process for the extraction of copper from a sulphide copper ore or concentrate comprises subjecting the ore or concentrate to a first leaching at an elevated temperature and pressure in the presence of oxygen and a lixiviant which comprises an acidic solution of chloride and sulphate ions to produce an insoluble basic copper sulphate. The basic copper sulphate so produced is leached in a second leaching preferably at atmospheric pressure with an acidic sulphate solution to dissolve the basic copper salt to produce a leach liquor containing copper sulphate in solution. The resulting leach liquor is subjected to solvent extraction to produce a copper concentrate solution and a raffinate comprising protons and sulphate ions in solution. Protons and sulphate ions are extracted from the raffinate to produce a sulphuric acid solution which sulphuric acid solution is then recycled to the first leaching at elevated pressure and temperature to serve as a source of sulphate ions in the lixiviant. According to a preferred embodiment, the extraction of the protons and sulphate ions from the raffinate is effected by means of an electrodialysis process. In alternative embodiments copper sulphate is also extracted from the raffinate and recycled to the first leaching step or alternatively a source of sulphate ions, such as a hydrolyzable metal sulphate is introduced from another source.
Cominco Engineering Services Ltd.
de Kock Elbie R.
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