Processes and methods for production of crystallized metal sulfates

A process for crystallizing a metal sulfate, the process comprising:

• providing at least a portion of a fluid stream from a process performed in a metal processing plant to a crystallizer,
• the stream comprising a metal sulfate and an impurity;
• controlling operational parameters of the crystallizer to crystalize the metal sulfate over the impurity, and
• crystallizing the metal sulfate to form a crystallized metal sulfate in a mother liquor, the mother liquor comprising the impurity and uncrystallized metal sulfate;
• separating the crystallized metal sulfate from the mother liquor;
• and
• returning the mother liquor to the metal processing plant;
• wherein the fluid stream provided to the crystallizer is diverted from a feed stream to a metal electrowinning, metal hydrogen reduction, metal intermediate production, or metal oxide production step of the plant.

A process for crystallizing a metal sulfate, the process comprising:

• providing at least a portion of a fluid stream from a process performed in a metal processing plant to a crystallizer,
• the stream comprising a metal sulfate and an impurity;
• controlling operational parameters of the crystallizer to crystalize the metal sulfate over the impurity, and
• crystallizing the metal sulfate to form a crystallized metal sulfate in a mother liquor, the mother liquor comprising the impurity and uncrystallized metal sulfate;
• separating the crystallized metal sulfate from the mother liquor;
• and
• returning the mother liquor to the metal processing plant;
• wherein the fluid stream provided to the crystallizer is an anolyte diverted from a metal electrowinning step of the plant.