US 12,441,621 B2
Treatment process for crystallizing a metal sulfate
Robert John Fraser, Oakville (CA); Henry Christian Immo Von Schroeter, Toronto (CA); and Mark Joseph Machado, Waterdown (CA)
Assigned to HATCH LTD.
Filed by HATCH LTD., Mississauga (CA)
Filed on Oct. 31, 2022, as Appl. No. 17/977,408.
Application 17/977,408 is a continuation of application No. PCT/CA2021/051557, filed on Nov. 3, 2021.
Claims priority of provisional application 63/109,227, filed on Nov. 3, 2020.
Prior Publication US 2023/0049318 A1, Feb. 16, 2023
Int. Cl. C01G 1/10 (2006.01)
CPC C01G 1/10 (2013.01) [C01P 2006/40 (2013.01); C01P 2006/80 (2013.01)] 41 Claims
OG exemplary drawing
 
12. A treatment process for crystallizing a metal sulfate, the process comprising:
pre-treating a feedstock comprising lithium impurities, the pre-treating comprising pre-leaching the feedstock in the presence of a lixiviant,
selectively extracting a first portion of the lithium impurities from the feedstock, and
forming a pre-leached feedstock;
refining the pre-leached feedstock and forming a leached solution comprising an uncrystallized metal sulfate; and
crystallizing the uncrystallized metal sulfate from the leached solution to form a crystallized metal sulfate.