Method for removing harmful organic compounds from aluminate liquors of the Bayer process
AssigneeGebruder Giulini GmbH
InventorsBernhard Schepers, Gerhard Bayer, Ernst Urmann, Klaus Schanz
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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.
Claims10
A method for removing harmful discoloring organic compounds from an aluminate liquor obtained in the production of alumina according to the Bayer process where bauxite is decomposed in a digester, comprising:
- a. adding a magnesium compound to the aluminate liquor, the magnesium compound being a compound which reacts with the aluminate liquor to form a hydroxide mixture containing magnesium hydroxide and aluminum hydroxide which precipitates from the aluminate liquor;
- b. maintaining the precipitated mixture in the aluminate liquor, while stirring, until at least a part of the harmful discoloring organic compounds have been eliminated from the aluminate liquor;
- and
- c. then separating the hydroxide mixture containing said harmful discoloring organic compounds from the aluminate liquor.
Dependencies are inferred from the claim text.