Preparation and application processes of multi-source solid waste-based low-carbon cementing material

The invention discloses a multi-source solid waste-based low-carbon cementing material, a preparation method and application, and relates to the technical field of mine filling. 58-62 wt% of blast furnace slag; 15-18 wt% of desulfurized gypsum and 4-10 wt% of an alkaline excitation material; and 0.1-0.3 wt% of an additive is added. The preparation method of the cementing material comprises the following steps: S1, mixing the copper tailings, the blast furnace slag, the desulfurized gypsum, the alkaline excitation material and the additive in proportion, and drying to obtain a dry-mixed coarse material; and S2, grinding the mixed coarse material until the specific surface area is greater than or equal to 450m < 2 >/kg to obtain the multi-source solid waste cementing material. The multi-source solid waste cementing material is applied to subsequent filling, tailings obtained after mineral separation are graded, fine tailings with the particle size smaller than 0.075 mm are pumped into a deep-cone thickener, a f