Process for polishing metal contaminants from an acidic solution comprising scandium
AssigneeRio Tinto Iron and Titanium Canada Inc.
InventorsMichel Paquin, Dimitrios Filippou
Life of this patent
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Abstract
The present disclosure provides a process for polishing at least one metal contaminant from a stock solution comprising Sc comprising the steps of a) contacting the stock solution with an ion exchange resin capturing Sc and the at least one metal contaminate so as to produce a metal ion exchange resin complex, and b) scrubbing the metal resin complex with a scrubbing solution comprising a carboxylate ion, so as to produce a Sc ion exchange resin complex and a spent carboxylate solution, which can be treated by electrodialysis to regenerate the carboxylate ion required for scrubbing.
Claims19
A process for polishing at least one metal contaminant from a stock solution comprising Sc, wherein the at least one metal contaminant is titanium (Ti), thorium (Th), or zirconium (Zr), the process comprising:
- a) contacting the stock solution with an ion exchange resin capturing Sc and the at least one metal contaminant so as to produce a metal ion exchange resin complex, and
- b) scrubbing the metal ion exchange resin complex with a scrubbing solution comprising a salt having a carboxylate ion having a pKa in a range of 2.5 to 4.0, so as to produce a Sc ion exchange resin complex and a spent carboxylate solution.
A process for polishing at least one of titanium (Ti), thorium (Th), and zirconium (Zr) from a stock solution comprising Sc, the process comprising:
- a) contacting the stock solution with an ion exchange resin capturing Sc, and the at least one of Ti, Th, and Zr to produce a metal resin complex, and
- b) scrubbing the metal resin complex with a scrubbing solution comprising a salt having a citrate ion and a pH between 3.0 and 4.0, so as to produce a Sc ion exchange resin complex and a spent carboxylate solution.
Dependencies are inferred from the claim text.