期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 31, 期 5, 页码 1484-1495出版社
ELSEVIER
DOI: 10.1016/S1003-6326(21)65592-9
关键词
bauxite residue; phosphogypsum; saline-alkalinity; aggregate stability
资金
- National Natural Science Foundation of China [42030711, 41877511]
The study found that phosphogypsum treatment significantly altered the saline-alkalinity of bauxite residue and improved its aggregate stability, providing an effective approach for reclaiming bauxite residue disposal areas.
A column experiment was conducted to investigate the effect of phosphogypsum (PG) on the saline-alkalinity, and aggregate stability of bauxite residue. Results showed that: with increasing leaching time, the concentrations of saline-alkali ions decreased while the SO42- concentration increased in bauxite residue leachate; compared with CK (control group) treatment, pH, electric conductivity (EC), exchangeable sodium percentage (ESP), sodium absorption ratio (SAR), and exchangeable Na+ content of bauxite residue were reduced following PG treatment; average particle sizes in aggregates following CK and PG treatments were determined to be 155 and 193 nm, respectively. SR-mu CT test results also confirmed that bauxite residue following PG treatment acquired larger aggregates and larger pore diameter. These results indicate that the PG treatment could significantly modulate the saline-alkalinity, and simultaneously enhance aggregate stability of bauxite residue, which provides a facile approach to reclaim bauxite residue disposal areas.
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