C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/72
C25C 1/08 (2006.01)
Patent
CA 1142130
ABSTRACT OF THE DISCLOSURE The present invention relates to a hydrometallurgical process for treating nickel mattes for the purpose of producing high purity nickel, that is to say in a proportion smaller than approximately 0.05% of foreign elements, as well as for recovery of cobalt. It is known that mattes of this kind have a nickel content of about 75% by weight and that they also contain co- balt in proportions commonly comprised between 1.5 and 2%, as well as 2 to 4% of iron, for example, the remainder essentially comprising sulphur. The specification discloses a process of recovering high purity nickel from an aqueous solution containing sulfate ions and nickel, lead, iron, chromium, arsenic and aluminum chlorides, comprising: (a) subjecting the solution which has a concentration of nickel of at least 100 g/l to partial electrolysis employing a soluble nickel anode to obtain a deposit of elemental nickel containing elemental lead and an aqueous phase containing nickel, iron, chromium, arsenic, aluminum and sulfate ions; (b) contacting the aqueous phase of (a) with an organic phase comprising at least one diester of orthophosphoric acid whereupon the nickel and sulfate ions remain in the aqueous phase and the other ions pass into the organic phase; (c) recovering the nickel from the aqueous phase of (b); and (d) recovering the nickel from the deposit of (a).
387835
Demarthe Jean-Michel
Gandon Louis
Goujet Monique
Gowling Lafleur Henderson Llp
Societe Metallurgique - Le Nickel-Sln
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