Method for cleaning and recovering metal mercury from roasting gases containing it
CA 2054744 A1 · Owner: Gonzalez-Posada Sanchez, Armando · Inventors: Fernandez Tallants, Miguel; Gonzalez-Posada Sanchez, Armando
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is described for the recovery in metallic form, of, mercury present in roasting gases containing SO2, so that the, purified gas has less than 0.1 mg/m3 of this element. Essentially the system consists of a conventional device for the cooling and scrubbing of the gas; two irrigated towers with an acid solution of Hg(SCN)42- free SCN- and active carbon; two wet electrostatic precipitators, one in front of the first tower and another between them and a reactor for scrubbing the emulsion (soot) obtained from the condensation with ammonium. All mercury-bearing tailings are recycled to the roasting oven at appropriate intervals, until under certain conditions the hot gases attain a …
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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 March 5, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2013.
- 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.