Electrolytic　manganese　residue　(EMR)　is　known　for　high　concentrations　of　Mn2+,　NH4+,　and　heavy　metals.　Failure　to　undergo　benign　treatment　and　landfill　disposal　would　undeniably　lead　to　negative　impacts　on　the　quality　of　the　surrounding　ecological　environment.　This　study　sought　to　mitigate　the　latent　environmental　risks　associated　with　EMR　using　a　cooperative　solidification/stabilization　(S/S)　method　involving　coal　fly　ash　(CFA).　Leveraging　leaching　toxicity　tests,　the　leaching　behavior　of　pollutants　in　electrolytic　manganese　residue-based　geopolymer　materials　(EMRGM)　was　determined.　At　the　same　time,　mechanistic　insights　into　S/S　processes　were　explored　utilizing　characterization　techniques　such　as　XRF,　XRD,　FT-IR,　SEM-EDS,　and　XPS.　Those　results　confirmed　significant　reductions　in　the　leaching　toxicities　of　Mn2+　and　NH4+to　4.64　mu　g/L　and　0.99　mg/L,　respectively,　with　all　other　heavy　metal　ions　falling　within　the　permissible　limits　set　by　relevant　standards.　Further　analysis　shows　that　most　of　NH4+　volatilizes　into　the　air　as　NH3,　and　a　small　part　is　fixed　in　the　EMRGM　in　the　form　of　struvite;　in　addition　to　being　oxidized　to　MnOOH　and　MnO2,　Mn2+　will　also　be　adsorbed　and　wrapped　by　silicon-aluminum　gel　together　with　other　heavy　metal　elements　in　the　form　of　ions　or　precipitation.　This　research　undeniably　provides　a　solid　theoretical　foundation　for　the　benign　treatment　and　resourceful　utilization　of　EMR　and　CFA,　two　prominent　industrial　solid　wastes.