Treatment of high nickel slimes
CA 2014733 C · Owner: Morrison, Bernard H. · Inventors: Morrison, Bernard H.; Stafiej, Jack S.; Baboudjian, Viken P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A two-stage process for treating anode slimes and other residues containing a substantial amount of nickel without significant dissolution of silver and/or selenium in a single autoclave is disclosed. The process comprises in, a first stage, leaching the anode slimes at 15-30% solids in dilute sulphuric acid at a pressure between 4.0 and 5.5 bars and a temperature between 155°C to 170°C in the absence of oxygen to syllables nickel, and in a second stage without, performing a solid liquid separation leaching the remaining, solids at a pressure between 2 and 3.5 preferably about 2.8, bars and a temperature between 110 and 140°C preferably, about 120°C with oxygen sparging such that the final …
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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
- Filed April 17, 1990 and granted September 17, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2012.
- 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
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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.