US 12,145,855 B2
Process for polishing metal contaminants from an acidic solution comprising scandium
Michel Paquin, Bécancour (CA); and Dimitrios Filippou, Mont-Royal (CA)
Assigned to RIO TINTO IRON AND TITANIUM CANADA INC., Sorel-Tracy (CA)
Appl. No. 17/053,299
Filed by RIO TINTO IRON AND TITANIUM CANADA INC., Sorel-Tracy (CA)
PCT Filed May 3, 2019, PCT No. PCT/CA2019/050589
§ 371(c)(1), (2) Date Nov. 5, 2020,
PCT Pub. No. WO2019/213753, PCT Pub. Date Nov. 14, 2019.
Claims priority of provisional application 62/667,797, filed on May 7, 2018.
Prior Publication US 2021/0163309 A1, Jun. 3, 2021
Int. Cl. C01F 17/13 (2020.01); B01J 45/00 (2006.01); B01J 49/53 (2017.01)
CPC C01F 17/13 (2020.01) [B01J 45/00 (2013.01); B01J 49/53 (2017.01)] 19 Claims
OG exemplary drawing
 
1. 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.