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Variation of alkaline characteristics in bauxite residue under phosphogypsum amendment.
- Source :
- Journal of Central South University; Feb2019, Vol. 26 Issue 2, p361-372, 12p
- Publication Year :
- 2019
-
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 CO<subscript>3</subscript><superscript>2-</superscript>>OH-> AlO<subscript>2</subscript><superscript>-</superscript>>HCO<subscript>3</subscript><superscript>-</superscript>. In addition, alkaline phase decreased from 52.81% to 48.58% and gypsum stably presented in bauxite residue which continuously provided Ca<superscript>2+</superscript> to inhibit dissolution of combined alkali. Furthermore, phosphogypsum promoted formation of macroaggregate structure, increased Ca<superscript>2+</superscript>, decreased Na<superscript>+</superscript> and Al<superscript>3+</superscript> on the surface of bauxite residue significantly, ultimately promoting soil formation in bauxite residue. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20952899
- Volume :
- 26
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Journal of Central South University
- Publication Type :
- Academic Journal
- Accession number :
- 134969618
- Full Text :
- https://doi.org/10.1007/s11771-019-4008-8