Treatment of alkaline bayer process residues

Details Treatment of alkaline bayer process residues Treatment of alkaline bayer process residues

C - Chemistry, Metallurgy

01

F

C01F 7/02 (2006.01) C01F 7/08 (2006.01)

Patent

CA 2556439

A method for the treatment of an alkaline Bayer process residue, the method comprising the steps of: Cooling and dehumidifying a flue gas by contacting the flue gas with a cool water stream and retaining the heat therefrom; Contacting a carbonate solution with the cooled, dehumidified flue gas to form a bicarbonate solution; Heating the bicarbonate solution utilising the heat recovered from the cooled flue gas; Contacting the alkaline Bayer process residue with the heated bicarbonate solution; Recovering a carbonate solution; and Recycling the recovered carbonate solution by contacting the recovered carbonate solution with a cooled, dehumidified flue gas to form a bicarbonate solution.

L'invention concerne un procédé de traitement de résidus issus de procédé Bayer: refroidissement et déshydratation de gaz de combustion par contact entre ces gaz de combustion et un flux d'eau fraîche, et conservation de la chaleur résultante; contact entre une solution de carbonate et les gaz ainsi traités pour former une solution de bicarbonate; échauffement de la solution de bicarbonate en utilisant la chaleur fournie par les gaz traités; contact entre les résidus de procédé Bayer et la solution de bicarbonate ainsi chauffée; récupération d'une solution de carbonate; et recyclage de la solution de carbonate récupérée par contact entre cette solution et des gaz de combustion traités comme indiqué ci-dessus pour former une solution de bicarbonate.

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