A method for production of crystallized Cobalt (II) Chloride hexahydrate is disclosed, and an implementation includes preparing a first cobalt (II) chloride solution, separating impurities from the first cobalt (II) chloride solution to obtain a second cobalt (II) chloride solution, concentrating the second cobalt (II) chloride solution, cooling the concentrated second cobalt (II) chloride solution, and injecting CO2 gas into the cooled concentrated second cobalt (II) chloride solution at an atmospheric pressure in order for Cobalt (II) Chloride hexahydrate crystals to form in the cooled concentrated second cobalt (II) chloride solution.
