Application of clean oxidation technology using H2O2 for simultaneous removal of sulfur and organic substances in the Bayer process

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Hydrometallurgy Pub Date : 2024-07-19 DOI:10.1016/j.hydromet.2024.106367

Mengnan Li , Zhanwei Liu , Hengwei Yan , Wenhui Ma , Shuxin Liu

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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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应用 H2O2 清洁氧化技术同时去除拜耳工艺中的硫和有机物质

硫和有机物的有害影响制约着拜耳法氧化铝生产的绿色和可持续发展。本研究旨在根据硫和有机物的矿物学调查，开发一种在铝土矿消化阶段利用 H2O2 去除硫和有机物的方法。在 H2O2 用量为 12%、温度为 533 K、时间为 80 分钟的最适宜条件下，S2- 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，S2- 被氧化成 SO42-。此外，还提出了拜耳液 H2O2 湿氧化过程中有机物的自由基反应机理。结果证实，这种方法不会引入任何杂质，也不会对氧化铝的消化效率和拜耳工艺产生任何影响。

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来源期刊

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.