Alumina recovery

C - Chemistry – Metallurgy – 01 – F

Patent

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Details

C01F 7/04 (2006.01) C01F 7/46 (2006.01) C01F 7/47 (2006.01)

Patent

CA 2597086

A process for recovering alumina values from a first liquor having an initial concentration of aluminate ions and hydroxyl ions in solution is described. The first liquor is treated with a hydroxide of a metal other than aluminium to form an aluminium-bearing layered double hydroxide and produce a treated stream of first liquor, the treated stream of first liquor having a final concentration of aluminate ions less than the initial concentration of aluminate ions. The aluminium-bearing layered double hydroxide is separated from the treated stream of first liquor. Thereafter the clarified treated stream of first liquor is returned to a first location within an alumina refinery. The separated aluminium-bearing layered double hydroxide is contacted with a solution containing carbonate ions to form a slurry comprising an insoluble salt of the metal other than aluminium and a second liquor comprising aluminate ions released from the aluminium-bearing layered double hydroxide.

L'invention concerne un procédé pour extraire des valeurs d'alumine d'une première liqueur présentant une concentration initiale d'ions aluminate et d'ions hydroxyle, dans une solution. La première liqueur est traitée avec un hydroxyde de métal autre que l'aluminium pour former un hydroxyde à double couche portant de l'aluminium et pour produire un flux traité de première liqueur. Ce flux traité de première liqueur présente une concentration finale d'ions aluminate inférieure à la concentration initiale d'ions aluminate. L'hydroxyde à double couche portant l'aluminium est séparé du flux traité de première liqueur. Ensuite, le flux traité clarifié de la première liqueur est renvoyé à un premier emplacement situé à l'intérieur d'une raffinerie d'alumine. L'hydroxyde à double couche portant l'aluminium séparé est mis en contact avec une solution contenant des ions carbonate pour former une boue comprenant un sel insoluble du métal susmentionné autre que l'aluminium, et une seconde liqueur comprenant des ions aluminate libérés de l'hydroxyde à double couche portant l'aluminium.

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