Leaching risk and solidification mechanisms of electrolytic manganese residue pollutants based on the geopolymer system

LIU Bo; HE Li-li; YUE Bo; MENG Bang-bang; WANG Tao; GAO Hong

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (12) : 6465-6473.

Solid Waste

Leaching risk and solidification mechanisms of electrolytic manganese residue pollutants based on the geopolymer system

LIU Bo^1,2, HE Li-li^1,2, YUE Bo¹, MENG Bang-bang¹, WANG Tao^1,2, GAO Hong²

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Abstract

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.

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electrolytic manganese residue / geopolymer / mechanism / silicon-aluminum gel / solidification and stabilization

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LIU Bo, HE Li-li, YUE Bo, MENG Bang-bang, WANG Tao, GAO Hong. Leaching risk and solidification mechanisms of electrolytic manganese residue pollutants based on the geopolymer system[J]. China Environmental Science. 2023, 43(12): 6465-6473

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