Nickel recovery from sulfur-deficient mattes
CA 1107678 A · Owner: Inco Limited · Inventors: Thomas, John A.; Nissen, Norman C.; Subramanian, Kohur N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A nickel matte in which the atomic ratio of S:(Ni + Co + Cu) is less than 0.7 is fragmented and slurried with water or an aqueous nickel sulfate solution to ensure that the S:(Ni + Co + Cu) ratio for the slurry as a whole exceeds 004, the slurry is heated under pressure in the presence of oxygen to form a basic nickel sulfate and the reacted slurry is treated with lime to convert the basic nickel sulfate to nickel hydroxide. The nickel hydroxide is then separated from gypsum by physical separation and thereafter dissolved in spent sulfate electrolyte to generate fresh electrolyte from which nickel can be electrowon.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted August 25, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 25, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.