Method for removing harmful organic compounds from aluminate liquors of the Bayer process

US4046855A · kind A · utility

Assignee

• Gebruder Giulini GmbH

Inventors

• Bernhard Schepers · Bergheim, DE
• Gerhard Bayer
• Ernst Urmann · Ludwigshafen, DE
• Klaus Schanz

Key dates

• Filing date: Apr 14, 1976
• Grant date: Sep 6, 1977
• Expiry date: Apr 14, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01F7/473
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method is provided for removing harmful organic compounds from the aluminate liquor obtained in the production of alumina according to the Bayer process. A magnesium obtained is added to the aluminate liquor to form a hydroxide mixture containing magnesium hydroxide and aluminum hydroxide which precipitates from the aluminate liquor. The precipitated mixture is maintained in the aluminate liquor, while being stirred, until at least a part of the organic compounds have been eliminated from the aluminate liquor. The hydroxide mixture containing the organic compounds then is separated from the aluminate liquor.