Abstract
The harmful effects of sulfur and organic substances pose constraints on the green and sustainable development of the Bayer process for alumina production. This research aims to develop a method that utilizes H2O2 to remove sulfur and organic substances during the digestion stage of bauxite, based on the mineralogical investigation of sulfur and organic substance. The extent of removal of S2− and total organic carbon reached 95.6% and 68.0%, respectively, under most suitable conditions of 12% H2O2 dosage, temperature of 533 K, and duration of 80 min. Based on thermodynamic calculations, it is suggested that S2− is oxidized to SO42−. Additionally, the free radical reaction mechanism of organic substances in H2O2 wet oxidation of Bayer liquor is proposed. The results confirm that this method does not introduce any impurities and does not have any impact on the digestion efficiency of alumina and the Bayer process.
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