Effect of phosphogypsum on saline-alkalinity and aggregate stability of bauxite residue
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 24SO - 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-μCT 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.
NETL
NSTL
万方数据
维普
