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AssigneeH.C. Starck GmbH
InventorsArmin Olbrich, Astrid Görge, Frank Schrumpf, Juliane Meese-Marktscheffel, Viktor Stoller, Gerhard Gille, Josef Schmoll, Michael Kruft, Dirk Naumann
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The invention relates to a method for producing metal hydroxides or alkaline metal carbonates by anode dissolution of the corresponding metals and precipitation of the hydroxides or alkaline carbonates in an aqueous medium. The anode dissolution of the metal components is carried out in the anode compartment of a three-compartment electrolytic cell. An aqueous auxiliary salt solution is fed to an intermediate compartment that is disposed between the anode compartment and the cathode compartment and that is separated therefrom by a porous membrane. An at least not alkaline metal salt solution is continuously taken from the anode compartment while an alkaline auxiliary salt solution is continuously taken from the cathode compartment. The at least not alkaline metal salt solution and the alkaline auxiliary salt solution are combined outside the electrolytic cell for the purpose of precipitating metal hydroxides or alkaline metal carbonates.
Process for the preparation of metal hydroxides or basic metal carbonates by anodic dissolution of corresponding metals and precipitation of the hydroxides or basic carbonates in an aqueous medium, which process is characterised in that the anodic dissolution of the metal component takes place in the anode chamber of a three-chamber electrolytic cell, an aqueous auxiliary salt solution is fed continuously to the intermediate chamber arranged between the anode chamber and the cathode chamber and separated therefrom by porous membranes, an at least non-alkaline metal salt solution is removed continuously from the anode chamber, an alkaline auxiliary salt solution is removed continuously from the cathode chamber, and the at least non-alkaline metal salt solution and the alkaline auxiliary salt solution are combined outside the electrolytic cell in order to precipitate metal hydroxides or basic metal carbonates.
Device for the preparation of metal hydroxides, containing a three-chamber electrolytic cell which is divided by means of porous membranes into an anode chamber, an intermediate chamber and a cathode chamber, and which has an inlet to the intermediate chamber, an outlet from the anode chamber and an outlet from the cathode chamber, a precipitation reactor, one inlet of which is connected to the outlet of the anode chamber and the other inlet of which is connected to the outlet of the cathode chamber, and which has an outlet, as well as means for separating solids from the product discharged from the precipitation reactor.
Dependencies are inferred from the claim text.