Abstract:To solve the problems of frequent pipe blockage accidents and poor quality of the backfill in a domestic mine, a technical idea for optimizing the filling tailings particle size distribution and pipeline laying was proposed, and experiments and field application verification ascarried out. The results show that the optimal mixing ratio of classified coarse tailings and fine tailings is between 5:5 and 6:4, and the filling slurry with a mass concentration of 74% to 78% can realize gravity transportation. To achieve an efficient concentration of classified fine tailings, the best feed slurry concentration is 8%~10%, the amount of flocculant added is 10~15g/t, and the underflow concentration can reach 56%~60%. By optimizing the laying of the filling pipeline, the filling pipeline is reduced by 485 meters, and the average filling multiplier is reduced from 6.4 to 4.5. The optimized filling tailings and pipeline laying were used in the mine application verification, which ensured the stability of the backfilling parameters and improved the quality of the backfill, and achieved efficient and stable mine filling.