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 HO 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 S and total organic carbon reached 95.6% and 68.0%, respectively, under most suitable conditions of 12% HO dosage, temperature of 533 K, and duration of 80 min. Based on thermodynamic calculations, it is suggested that S is oxidized to SO. Additionally, the free radical reaction mechanism of organic substances in HO 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.

中文翻译：

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H2O2清洁氧化技术在拜耳法中同时脱硫和有机物的应用


硫和有机物的有害影响制约了拜耳法氧化铝生产的绿色、可持续发展。本研究旨在基于硫和有机物的矿物学研究，开发一种在铝土矿消化阶段利用 H2O 去除硫和有机物的方法。在最适宜的H2O用量12%、温度533 K、时间80 min的条件下，S和总有机碳的去除率分别达到95.6%和68.0%。根据热力学计算，S被氧化成SO。此外，还提出了拜耳液H2O湿式氧化中有机物的自由基反应机理。结果证实该方法没有引入任何杂质，对氧化铝的消化效率和拜耳法没有任何影响。