Process for precipitating iron as jarosite with a low non-ferrous metal content
CA 1136860 A · Owner: Electrolytic Zinc Company Of Australasia Limited · Inventors: Pammenter, Robert V.; Haigh, Curzon J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for precipitating ferric iron as a jarosite from a sulphate solution containing ferric iron free acid and valuable non-ferrous metals characterised, by diluting the said solution with a diluent solution of low acidity so that the ferric iron concentration of the diluted solution lies in the range 5 to 35 grams per litre and the free acid concentration lies in the range 5 to 40 grams per litre, heating to a temperature up to the boiling point at atmospheric pressure in the presence of at least one ion from the group consisting of sodium potassium and ammonium ions, and in the presence of recycled jarosite, without the addition of any neutralizing agent, so that substantially all of …
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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 December 7, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 7, 1999.
- 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.