Nickel refining method

Details Nickel refining method Nickel refining method

2006-11-21

2006-11-21

King, Roy (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

Reexamination Certificate

active

07138005

ABSTRACT:
The present invention provides a nickel refining method which uses nickel sulfide produced from nickel oxide ore using a hydrometallurgical process, as the raw material, and in which chlorine leaching is performed using a chloride solution, wherein a cementation reaction is caused between the nickel sulfide and copper ions, using copper ions, preferably included in the leaching solution itself, and a portion of the nickel in the nickel sulfide is leached into the solution, and the remaining nickel and copper are left as a residue, and copper and nickel are chlorine leached from this residue, and wherein the cementation reaction is performed with an oxidation-reduction potential as measured by a silver-silver chloride electrode of below −20 mV, preferably below −100 mV.

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patent: 06-116660 (1994-04-01), None
patent: 07-091599 (1995-04-01), None
patent: 10-140257 (1998-05-01), None

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