TREATMENT OF ALKALINE BAYER PROCESS RESIDUES

摘要

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.