Waste-free underground filling method using tailings and lump gangue of coal preparation plant

The invention discloses a waste-free underground filling method utilizing tailings and lump gangues of a coal preparation plant, which comprises the following steps: S1, providing skeleton aggregates which are lump gangues after granularity adjustment; s2, providing tailing slurry; s3, the framework aggregate and the tailing slurry are conveyed to the underground, the to-be-filled area is filled with the framework aggregate, and then the tailing slurry and the curing material are evenly mixed and injected into gaps between the framework aggregate in the to-be-filled area; and S4, after filler formed by the framework aggregate, the tailing slurry and the curing material is cured, underground filling is completed. By integrating the application of the gangue blocks and the flotation tailings of the coal preparation plant, a traditional mode of using natural materials such as gravel is replaced, so that the purchase and transportation cost can be reduced, the resource waste is reduced, the coal mining efficiency