Process for producing alumina

Details Process for producing alumina Process for producing alumina

C - Chemistry, Metallurgy

01

F

C01F 7/47 (2006.01) C01F 7/06 (2006.01)

Patent

CA 2313482

A process for producing alumina from bauxite is described in which bauxite is treated with an alkali to form a mixture comprising a solution of aluminium- containing ions and alumina trihydrate is precipitated from the solution. The process comprises treatment of the solution before or after the precipitation step with a layered double hydroxide in order to remove impurities from the solution by intercalation into the layers in the double hydroxide. The double hydroxide may contain layers of the formula: [LiAl2(OH)6]+.

L'invention concerne un procédé permettant d'obtenir de l'alumine à partir de bauxite, dans lequel la bauxite est traitée avec un composé alcalin de manière à former un mélange comprenant une solution d'ions renfermant de l'aluminium, et dans lequel l'alumine trihydratée est précipitée de la solution. Le procédé comprend le traitement de la solution avant ou après l'opération de précipitation par un hydroxyde double stratifié afin d'éliminer les impuretés de la solution par intercalation dans les couches dans l'hydroxyde double. L'hydroxyde double peut renfermer des couches de formule: [LiAl¿2?(OH)¿6?]?+¿.

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