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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 2    February 2019

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Variation of alkaline characteristics in bauxite residue under phosphogypsum amendment
LI Yi-wei(李义伟)1, 2, LUO Xing-hua(罗兴华)1, LI Chu-xuan(李楚璇)1, Graeme J. MILLAR3, JIANG Jun(江钧)1, XUE Sheng-guo(薛生国)1

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Hunan Rare Earth Metal Material Research Institute, Changsha 410126, China;
3. Institute for Future Environments, Science and Engineering Faculty, Queensland University of Technology (QUT), Brisbane Qld 4000, Australia

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.

 

Key words: bauxite residue; alkaline regulation; free alkali; phosphogypsum amendment; soil formation in bauxite residue

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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