Abstract:In order to solve the safety and environmental problems caused by the high disposal cost and low disposal rate of mine tailings in high altitude and cold areas. This paper studies the applicability of "steel slag-slag-desulfurized gypsum-refining slag" quaternary solid waste filling material in mines in high altitude and cold regions. A backfill copper mine in Tibet was taken as a case study. The technical feasibility study on the consolidation of solid waste backfill materials at low temperatures was carried out through lab scale experiments. The economic assessment of the technology application was carried out by analyzing the cost of raw materials, transportation costs, environmental benefits, and the cost of the backfill process. The results show that the uniaxial compressive strength of the whole solid waste filling material reaches 1.22-1.46 MPa after being cured at 5 ℃ for 28 days. The slumps of the filling materials are 192 to 225mm, which meet the requirements of back and fill at the mines in the high altitude and cold areas. The cost of raw materials, transportation cost, and environmental benefits are 193, 210, and 103 CNY/t, respectively. When the cement to tailing ratio is 1:8, the cost of tailings disposal using cementitious materials composited of whole solid wastes is 50 CNY/t, which is 1/3 of that using P.O. cement. This paper is the first to study the application of the "steel slag-slag-desulfurized gypsum-refining slag" quaternary solid waste-based cementitious system in mine filling in alpine regions. The research results of this paper can provide guidance for reducing the cost of tailings disposal in high-altitude cold regions.