Improved bayer causticisation

Details Improved bayer causticisation Improved bayer causticisation

C - Chemistry, Metallurgy

01

F

C01F 7/06 (2006.01) B01F 17/00 (2006.01) C01F 7/47 (2006.01)

Patent

CA 2470673

An improved process for the causticisation of Bayer liquors in an alumina refinery, the process including the steps of reacting time with aluminate ions in a Bayer liquor within a primary reactor under controlled conditions of low to moderate temperature (between 70-80°C) and agitation, to form substantially only a hydrocalumite species and hydroxyl ions; and a secondary reactor wherein said hydrocalumite species formed is subjected to heating in contact with a Bayer liquor under controlled conditions so as to cause the hydrocalumite species to react with the liquor to form calcium carbonate, aluminate ions and hydroxyl ions, whereby a causticised Bayer liquor is obtained and wherein the efficiency of lime utilisation is substantially increased and/or alumina losses are minimised.

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