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Variation of alkaline characteristics in bauxite residue under phosphogypsum amendment

磷石膏改良作用下赤泥的碱性变化

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Abstract

Aiming at alkaline problem of bauxite residue, this work focused variation of alkaline characteristics in bauxite residue through phosphogypsum treatment. The results demonstrated that the pH of bauxite residue reduced from initial 10.83 to 8.70 when 1.50 wt% phosphogypsum was added for 91 d. The removal rates of free alkali and exchangeable sodium were 97.94% and 75.87%, respectively. Meanwhile, significant positive correlations (P<0.05) existed between pH and free alkali, exchangeable sodium. The effect of free alkali composition was CO32–>OH–> AlO2–>HCO3–. In addition, alkaline phase decreased from 52.81% to 48.58% and gypsum stably presented in bauxite residue which continuously provided Ca2+ to inhibit dissolution of combined alkali. Furthermore, phosphogypsum promoted formation of macroaggregate structure, increased Ca2+, decreased Na+ and Al3+ on the surface of bauxite residue significantly, ultimately promoting soil formation in bauxite residue.

摘要

赤泥碱性转化是氧化铝工业处置固体废物面临的世界性难题。本文开展工业废弃物对赤泥碱性 改良研究,结果表明:磷石膏最优添加量为1.50 wt%,处理91 天后,赤泥pH 由10.83 降至8.70;自 由碱去除率为97.94%,可交换性钠去除率为75.87%,自由碱、可交换性钠和赤泥pH 存在显著正相 关关系 (P<0.05);自由碱的作用效果为CO32–>OH–>AlO2–>HCO3–;化学结合碱含量从52.81%降至 48.58%,固相中稳定性强的石膏为液相体系持续提供Ca2+,抑制结合碱的溶解;磷石膏促进团聚体形 成,表面Ca2+含量增加, Na+、Al3+含量降低,有利于加快赤泥土壤化进程。

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Yi-wei Li  (李义伟), Xing-hua Luo  (罗兴华), Chu-xuan Li  (李楚璇), Jun Jiang  (江钧) & Sheng-guo Xue  (薛生国)

  2. Hunan Rare Earth Metal Material Research Institute, Changsha, 410126, China

    Yi-wei Li  (李义伟)

  3. Institute for Future Environments, Science and Engineering Faculty, Queensland University of Technology (QUT), Brisbane, Qld, 4000, Australia

    Graeme J. Millar

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  1. Yi-wei Li  (李义伟)
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  3. Chu-xuan Li  (李楚璇)
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  5. Jun Jiang  (江钧)
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Correspondence to Sheng-guo Xue  (薛生国).

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Foundation item: Projects(41877511, 41842020) supported by the National Natural Science Foundation of China

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Li, Yw., Luo, Xh., Li, Cx. et al. Variation of alkaline characteristics in bauxite residue under phosphogypsum amendment. J. Cent. South Univ. 26, 361–372 (2019). https://doi.org/10.1007/s11771-019-4008-8

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