Abstract: A method and apparatus for electrolytically preparing in an electrolytic cell metal, preferably zinc, in pulverulent form from a compound of the metal, for example, zinc oxide, in an aqueous ionized solution, for example potassium hydroxide of a concentration of 100 to 800 g/l, the solution preferably containing 10 to 350 of zinc per liter. The cathode at the bottom of the electrolytic cell comprises a layer of the same pulverulent metal, for example zinc, into which a grid cathode current input is introduced, the cathode current applied being sufficient to prevent the formation of metal in continuous form, preferably between 8 and 18 A/dm.sup.2. The anode is disposed in the cell above the cathode. New solution is injected about the lower periphery of the cell so as to set the solution and pulverulent metal is turbulent suspension.

Abstract: A method and apparatus for electrolytically preparing in an electrolytic cell metal, preferably zinc, in pulverulent form from a compound of the metal, for example, zinc oxide, in an aqueous ionized solution, for example potassium hydroxide of a concentration of 100 to 800 g/l, the solution preferably containing 10 to 350 of zinc per liter. The cathode at the bottom of the electrolytic cell comprises a layer of the same pulverulent metal, for example zinc, into which a grid cathode current input is introduced, the cathode current applied being sufficient to prevent the formation of metal in continuous form, preferably between 8 and 18 A/dm.sup.2. The anode is disposed in the cell above the cathode. New solution is injected about the lower periphery of the cell so as to set the solution and pulverulent metal is turbulent suspension.

Abstract: Method for recovering potassium hydroxide and zinc oxide from potassium zincate solutions, characterized in that a selective solvent of potassium hydroxide, which is miscible with water, is added to the zincate solution, in that the zinc oxide precipitate thus obtained is filtered and in that the mother liquors for separating the potassium hydroxide solution from the solvent are treated. The invention applies to all electrochemical storage cell batteries having a zinc negative electrode in which it is required to purify the electrolyte with a view to scavenging it.