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US 2022/0135417 A1Published application
Use of Calcium Fluoride in the Bayer Process
AssigneeRio Tinto Alcan International Limited
InventorsLisa CÔTÉ, Sébastien Fortin, Élizabeth Gingras-Lefleur
Life of this patent
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Abstract
A Bayer process includes contacting bauxite and calcium fluoride with sodium hydroxide and forming a slurry, with the calcium fluoride may provide at least 1 wt. % of the calcium added to the process, and precipitating alumina from the slurry.
Claims20
A Bayer process that includes:
- contacting bauxite and calcium fluoride with sodium hydroxide and forming a slurry, with the calcium fluoride providing at least 1 wt. % of the calcium added to the process, and
- precipitating alumina from the slurry.
A Bayer process that includes:
- contacting bauxite and calcium fluoride with sodium hydroxide and forming a slurry, with the calcium fluoride providing at least 1 wt. % of the calcium added to the process,
- precipitating a calcium-phosphorus-fluorine-containing compound and/or a calcium-phosphorus containing compound from the slurry as a consequence of the addition of the calcium fluoride and thereby reducing the phosphorus concentration in the slurry, and precipitating alumina from the slurry.
A Bayer process that includes:
- contacting boehmite-containing and/or gibbsite-containing bauxite and calcium fluoride with sodium hydroxide and forming a slurry, with the calcium fluoride providing at least 1 wt. % of the calcium added to the process, and precipitating alumina from the slurry.
Dependencies are inferred from the claim text.