Abstract: A process for the production of substantially pure hydrated nickel sulphate which involves reacting sulphuric acid with nickel chloride at the boiling point of the reaction mixture and partially removing formed hydrogen chloride gas. The reaction mixture is clarified to separate impurities, the formed nickel sulphate is crystallized from the clarified mixture, and the mother-liquor obtained at this stage recycled to an earlier stage of the process. The crystals of nickel sulphate are dried and the mother-liquid obtained at this stage, then recycled to an earlier stage of the process. The hydrated nickel sulphate obtained is substantially pure and essentially free of chloride ions.

Abstract: A method is provided of continuously producing and recovering metallic chlorides.

Abstract: A cell for producing metal by electrolysis of aqueous solutions of the relevant chloride comprises at least one electrolytic tank having upright cathodes and upright insoluble anodes alternating in the longitudinal direction of the tank, each anode being surrounded by an anodic box whose sides which face cathodes each comprise a diaphragm, the cell further comprising means of collecting and recovering the chlorine released during electrolysis, means of drawing off vapor generated at the surface of the electrolyte, means of blowing gas into the bottom of the tank below each cathode, and rack-mounted U-shaped guide-rail locating means for use in placing and for retaining in position the cathodes, the anodes and the anodic boxes.