Activated electrolytic manganese residue-based environmental materials for mine remediation: Performance and mechanism.

To address the environmental hazards of electrolytic manganese residue (EMR) accumulation and the urgent need for ecological restoration in mining areas, we developed an innovative method for creating pit restoration materials (S-EMRs) using alkaline-excited EMR via mechanical ball milling. Black liquid (BL) was used as a base exciter and EMR as the precursor. With a BL dosage of 35 %, alumina as the milling medium, a speed of 500 rpm, and milling for 20-35 min, we achieved an S-EMR compressive strength of approximately 30 MPa after 14 d-six times higher than that in conventional cement curing (C-EMR).