| 摘要 |
An improved process for the causticisation of Bayer's liquors in an alumina refinery, the process including the steps of reacting lime with aluminate ions in a Bayer's liquors within a primary reactor under controlled conditions of low to moderate temperature (between 70-80 DEGREE 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's liquors under controlled conditions so as to cause the hydrocalumite species to react with the solution to form calcium carbonate, aluminate ions and hydroxyl ions, whereby a causticised Bayer's liquors is obtained and wherein the efficiency of lime utilisation is substantially increased and/or alumina losses are minimised.
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