In　the　electrolytic　manganese　process,　efficient　sulfidation　enrichment　of　Ni,　Co,　and　Zn　is　essential　for　resource　recovery.　This　study　uses　(NH4)2S　and　SDD　as　composite　sulfiding　agents　and　employs　a　batch　addition　method　to　achieve　high　enrichment　of　Ni,　Co,　and　Zn.　When　the　temperature　is　45　°C,　the　ammonium　sulfide　dosage　is　40%　of　the　theoretical　value,　the　SDD　dosage　is　160%　of　the　theoretical　value,　the　pH　is　5.60,　the　reaction　time　is　30　min,　and　the　stirring　speed　is　650　rpm,　the　enrichment　rates　of　Ni,　Co,　and　Zn　exceed　99%,　with　a　manganese　impurity　ratio　of　1475.3.　Under　these　conditions,　the　sulfidation　of　Ni,　Co,　and　Zn　is　controlled　by　chemical　reactions,　with　apparent　activation　energies　(Ea)　of　30.29,　35.30,　and　38.73　kJ/mol,　respectively.　First-principles　calculation　results　show　that　the　bond　length　of　C3H6NS2-Me2+　and　the　Gibbs　free　energy　during　the　sulfidation　reaction　are　key　factors　contributing　to　the　selective　enrichment　of　Ni,　Co,　and　Zn.　The　life　cycle　assessment　(LCA)　indicates　that　the　treatment　cost　for　1　L　of　electrolytic　manganese　solution　is　5.95　¥,　demonstrating　good　environmental　and　economic　benefits.　This　study　provides　an　efficient　enrichment　method　for　the　recovery　of　strategic　metals　Ni,　Co,　and　Zn,　while　also　offering　an　electrolyte　with　low　Ni,　Co,　and　Zn　impurities　for　the　electrolytic　manganese　system.　©　2025　The　Author(s)