Process and method for producing crystallized metal sulfates
AssigneesNorthvolt AB, Hatch Ltd.
InventorsRobert John Fraser, Evangelos Stamatiou, Mark Joseph Machado, Henry Christian Immo von Schroeter, Mahmood Alemrajabi
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Abstract
A process for generating a metal sulfate that involves crystallizing a metal sulfate from an aqueous solution to form a crystallized metal sulfate in a mother liquor with uncrystallized metal sulfate remaining in the mother liquor; separating the crystallized metal sulfate from the mother liquor; basifying a portion of the mother liquor to convert the uncrystallized metal sulfate to a basic metal salt; and using the basic metal salt upstream of crystallizing the metal sulfate. So crystallized, the generated metal sulfate may be battery-grade or electroplating-grade.
Claims35
A process for generating a metal sulfate, the process comprising:
- crystallizing a metal sulfate from an aqueous solution to form a crystallized metal sulfate in a mother liquor, the mother liquor comprising an uncrystallized metal sulfate;
- separating the crystallized metal sulfate from the mother liquor;
- and
- basifying a portion of the mother liquor to convert the uncrystallized metal sulfate to a basic metal salt.
A process for generating a crystallized metal sulfate, the process comprising:
- leaching a feedstock to form a pregnant leach solution, the pregnant leach solution comprising a metal sulfate;
- crystallizing the metal sulfate from the pregnant leach solution to form a crystallized metal sulfate in a mother liquor, the mother liquor comprising an uncrystallized metal sulfate;
- separating the crystallized metal sulfate from the mother liquor;
- basifying a portion of the mother liquor to convert the uncrystallized metal sulfate to a basic metal salt;
- and
- using the basic metal salt as a first neutralizing agent upstream of crystallizing the metal sulfate, converting the basic metal salt back to the uncrystallized metal sulfate;
- wherein the crystallized metal sulfate is a battery-grade crystallized metal sulfate.
Dependencies are inferred from the claim text.