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pH variation mechanism of high sulfur-containing bauxite

Journal of Central South University 2015年第8期22卷 2909-2913页

作者：陈兴华胡岳华李旺兴陈湘清曹学锋 School of Minerals Processing and Bioengineering Central South University Aluminum Corporation of China Limited

In order to fundamentally solve the acidification problem of high sulfur-containing bauxite during storage, by simulating the environment of minerals storage in laboratory, the acidification mechanism and influencing factors of high sulfur-containing bauxite were studied and confirmed using the single variable method to control the atmosphere, water and other variables. The results show that the acidification is mostly caused by the oxidation of sulfur-containing bauxite, which is mainly the natural oxidation of Pyrite(Fe S2), then the alkaline minerals dissolute in the presence of water, leading to the acidification phenomenon, which is influenced by moisture and air flow. Finally, more acid-producing substances are formed, resulting in the acidification of high sulfur-containing bauxite. The acidification of high sulfur-containing bauxite results from the combined effect of the oxygen in the air and water, which can be significantly alleviated by controlling the diffusion of the oxygen in air.

关键词： high sulfur-containing bauxite pyrite acidification mechanism

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sulfur phase and sulfur removal in high sulfur-containing bauxite

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Transactions of Nonferrous Metals Society of China 2011年第7期21卷 1641-1647页

作者：胡小莲陈文汨谢巧玲中南大学冶金科学与工程学院长沙410083 湖南科技大学化学化工学院湘潭411201

The sulfur phase in high sulfur-containing bauxite was studied by an X-ray diffraction analysis and a chemistry quantitative *** methods for the removal of different shaped sulfur were also *** results show that sulfur phases in high sulfur-containing bauxites exist in the main form of sulfide sulfur （pyrite） or sulfate sulfur,and the main sulfur forms of bauxites from different regions are not the *** a combination of an X-ray diffraction analysis and a chemistry quantitative analysis,the sulfur phases of high sulfur-containing bauxite could be accurately *** the main sulfur form of high sulfur-containing bauxite could provide theoretical instruction for choosing methods for the removal of sulfur from bauxite,and an oxidizing-roasting process is an effective way to remove sulfide sulfur from high sulfur-containing bauxite,the content of S^2-in crude ore in the digestion liquor is above 1.7 g/L,but in the roasted ore digestion liquor,it is below 0.18 g/*** the sodium carbonate solution washing technology to wash bauxite can effectively remove sulfate sulfur,the content of the total sulfur in ore is lowered to below 0.2% and can meet the production requirements for the sulfur content.

关键词： high sulfur-containing bauxite sulfur phase oxidizing-roasting sodium carbonate solution washing technology

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