Nickel refining method
Patent 7138005 Issued on November 21, 2006. Estimated Expiration Date: 
September 9, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 9, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References3880653 InventorsAssigneeApplicationNo. 10238022 filed on 09/09/2002US Classes:75/714, From electrolytic or cementation slime205/591, Utilizing halogen containing material205/337Current, current density, or voltageExaminersPrimary: King, Roy V.Assistant: McNelis, Kathleen Attorney, Agent or FirmForeign Patent References
International ClassesC22B 23/00C22B 23/06 AbstractThe 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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