A process and method for producing a crystallized metal sulfate. The crystallized metal sulfate may be battery-grade. The method may comprise receiving a metal ion-containing stream and crystalizing a metal sulfate from the stream. The process may comprise receiving a stream from a metal processing plant, and crystalizing a metal sulfate from the stream. The process may be a metal electrowinning process comprising crystalizing a metal ion-containing stream to form a crystallized metal sulfate in a mother liquor. The process or method may comprise returning the mother liquor upstream or to the metal electrowinning process.

Described herein is a process for the production of potassium sulfate and ammonium sulfate from syngenite. Specifically, the syngenite is produced from waste liquors and low value minerals and is used to produce valuable secondary products. Specifically, instead of performing the decomposition reaction in one step at high temperature, this process performs the reaction in 2 steps at temperatures lower than the decomposition temperature of ammonium bicarbonate: a first step to reach the equilibrium and produce saturated potassium sulfate brine, and a second step to complete the syngenite decomposition reaction.

Described herein is a process for the production of potassium sulfate and ammonium sulfate from syngenite. Specifically, the syngenite is produced from waste liquors and low value minerals and is used to produce valuable secondary products. Specifically, instead of performing the decomposition reaction in one step at high temperature, this process performs the reaction in 2 steps at temperatures lower than the decomposition temperature of ammonium bicarbonate: a first step to reach the equilibrium and produce saturated potassium sulfate brine, and a second step to complete the syngenite decomposition reaction.

A process and method for producing a crystallized metal sulfate. The crystallized metal sulfate may be battery-grade. The method may comprise receiving a metal ion-containing stream and crystalizing a metal sulfate from the stream. The process may comprise receiving a stream from a metal processing plant, and crystalizing a metal sulfate from the stream. The process may be a metal electrowinning process comprising crystalizing a metal ion-containing stream to form a crystallized metal sulfate in a mother liquor. The process or method may comprise returning the mother liquor upstream or to the metal electrowinning process.

A process and method for producing a crystallized metal sulfate. The crystallized metal sulfate may be battery-grade. The method may comprise receiving a metal ion-containing stream and crystalizing a metal sulfate from the stream. The process may comprise receiving a stream from a metal processing plant, and crystalizing a metal sulfate from the stream. The process may be a metal electrowinning process comprising crystalizing a metal ion-containing stream to form a crystallized metal sulfate in a mother liquor. The process or method may comprise returning the mother liquor upstream or to the metal electrowinning process.