Coarse aggregate and preparation method thereof, mixed aggregate, filling slurry and filling body

The invention provides coarse aggregate and a preparation method thereof, mixed aggregate, filling slurry and a filling body, and belongs to the technical field of mine filling. The raw materials of the coarse aggregate comprise 85-90 wt% of superfine tailings, 5-10 wt% of a first cementing material and 0-5 wt% of fly ash, wherein the total mass of the raw materials of the coarse aggregate is 100%. According to the coarse aggregate, filling resource utilization of the superfine tailings is achieved while a large amount of the superfine tailings are consumed, the problems that the filling utilization rate of the superfine tailings is low, the storage capacity of a tailing pond is insufficient and emission pollution is caused are solved, and remarkable environmental benefits are achieved; in addition, the coarse aggregate is adopted to optimize the gradation of the superfine tailings, so that not only can the fluidity of the filling slurry be improved, but also the strength of a filling body can be improved. 本发