Hydrometallurgical processing of lead materials in the presence of fluorotitanate compounds
CA 2368868 A1 · Owner: Bhp Materials International Inc. · Inventors: Duyvesteyn, Willem P. C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Raw lead to be refined is leached in a leach apparatus with a leach solution containing fluoro compounds, in particular ferric fluorotitanate. During the leaching step, lead is dissolved, with ferric fluoro compounds being reduced to ferrous fluoro compounds. The leaching solution resulting from the leaching step is sent to the cathodic compartment of a diaphragm cell in which lead is deposited on a cathode, in compact, highly pure form. The solution that is depleted of lead is sent to the anodic compartment in which a suitable anode oxidizes the ferrous fluoro compound to ferric fluoro compounds that can be recycled to the leaching step. A process for electrorefining of lead from 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 30, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 30, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2022.
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