基于地聚物体系的电解锰渣污染物的溶出风险及固化机理

s：In order to mitigate the potential environmental risks associated with electrolytic manganese residue (EMR), a geological polymerization reaction was employed to carry out its solidification and stabilization. Through leaching toxicity tests and consecutive BCR extraction experiments, the leaching risk of electrolytic manganese residue-based polymer (EMRGP) was ascertained. Characterization techniques such as XRF, XRD, SEM-EDX, and XPS were utilized to investigate the solidification mechanism. The results revealed that the concentrations of Mn²⁺ and NH₄⁺ in the leachate from EMRGP were merely 4.64µg/L and 0.99mg/L, meeting the standards for discharge and reutilization. BCR continuous extraction experiments showed a lower leaching risk for EMRGP. During the solidification and stabilization process, the formation of silica-alumina gel occurred. NH₄⁺ either volatilized as NH₃ or precipitated as struvite, while Mn²⁺, apart from being oxidized to Mn³⁺ and Mn⁴⁺, concomitantly precipitating with other heavy metal species in the guise of hydroxide precipitates or enshrouded within the protective vestiges of silico-aluminous gels. This approach significantly alleviated the potential environmental risk associated with EMR.