Tailing comprehensive utilization goaf backfilling method

The invention discloses a tailings comprehensive utilization goaf backfilling method, and relates to the technical field of tailings treatment. The method comprises the steps that tailings are separated into first-stage tailings and second-stage tailings, and the particle size of the first-stage tailings is larger than that of the second-stage tailings; the secondary tailings are ground, and the particle size of the ground secondary tailings is smaller than 0.1-0.15 mm; preparing filling slurry; the ground secondary tailings are mixed with cement and water, then the primary tailings are added, and filling slurry is obtained after full stirring and mixing; the mass ratio of the secondary tailings to the cement is (1-1.5): 1, and the mass ratio of the primary tailings to the sum of the secondary tailings and the cement is (1-3): 1; and the goaf is backfilled with filling slurry. According to the method, the tailings are separated into the first-stage tailings and the second-stage tailings, the second-stage tail