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US 11,767,228 B2Granted
Processing rare earth sulphate solutions
AssigneeArafura Resources Limited
InventorAlexander Dean Elliot
Life of this patent
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Abstract
A method of processing a purified rare earth sulphate solution, the method including the steps of: contacting the purified rare earth sulphate solution with sodium hydroxide to precipitate rare earths as rare earth hydroxide, including the addition of an oxidant to oxidise cerium contained in the rare earth hydroxide precipitate; and selectively leaching the rare earth hydroxide precipitate with hydrochloric acid to form a rare earth chloride solution and a residue.
Claims10
A method of processing a purified rare earth sulfate solution, the method including:
- a) contacting the purified rare earth sulphate solution with sodium hydroxide to precipitate rare earths as rare earth hydroxide, including the addition of an oxidant to oxidise cerium contained in the rare earth hydroxide precipitate;
- and
- b) selectively leaching the rare earth hydroxide precipitate with hydrochloric acid to form a rare earth chloride solution that contains negligible cerium and a residue that consists primarily of cerium (IV) hydroxide.
Dependencies are inferred from the claim text.