Microscopic reaction mechanism of in situ treatment of acid mine drainage by alkali-activated geopolymers
ZHOU Lai
MAO Hengqi
YE Tao
ZHANG Kaikai
LIU Ying'ao
Abstract：To address the dual challenges of variable hydraulic loading and highly saline acidic water quality in the in-situ remediation of high-sulfur coal mine acid mine drainage(AMD),this study developed an alkali-activated geopolymer grouting material using cement-fly ash composites.Microstructural characterization and physical performance testing were conducted to evaluate the constitutive relationships and mechanical properties of the material.PHREEQC-based thermodynamic simulations were employed to analyze the contaminant im-mobilization mechanisms.The results show that the alkali-activated geopolymer enhances met-al ion stabilization through the formation of C-S-H gel and CaCO3 during AMD plugging.A-cidic erosion induces pH reduction and increases total dissolved solids in the solution,while the material maintains a removal efficiency exceeding 98.5％for total Fe and 98.0％for total Mn.Thermodynamic simulations confirm that AMD accelerates the precipitation of gel products and stable mineral phases,providing theoretical and methodological references for in-situ AMD remediation strategies.
Keywords：acid mine watergeopolymergrouting and plugginghydrogeochemical modelingsulfate
Publication Date：2025-07-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 887-895 )