Method for producing metal hydroxides or alkaline metal carbonates

US7048843B2 · kind B2 · utility

Assignee

• H.C. STARCK INC. · US

Inventors

• Armin Olbrich · Seesen, DE
• Astrid Gorge · Goslar, DE
• Frank Schrumpf · Goslar, DE
• Juliane Meese-Marktscheffel · Goslar, DE
• Viktor Stoller · Bad Harzburg, DE
• Gerhard Gille · Goslar, DE
• Josef Schmoll · Wermelskirchen, DE
• Michael Kruft · Sarnia, CA
• Dirk Naumann · Lorsch, DE

Key dates

• Filing date: Jun 6, 2001
• Grant date: May 23, 2006
• Expiry date: Dec 16, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25B1/00
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

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.