Abstract: | In order to study the stability of filling quality of the paste filling system in Wushan Copper Mine, the stability of pulping transportation, the stability of industrial operation and the fluctuation of backfill strength of the filling system are tested respectively. The results show that the deep cone thickener of the unclassified tailings paste backfill system can achieve relatively stable discharge and production under the condition that the storage time does not exceed 3 days, but when the storage time is prolonged, the material is easy to harden at the bottom of the deep cone, which will lead to the instability of discharge flow and concentration. Considering the imbalance of mining and backfilling activation, the mine should try to avoid long-term storage of materials in deep cone thickeners, and add fluidized activation pulping systems at the bottom of deep cones to ensure the stability of discharged tailings slurry. Under a relatively stable working conditions, the unclassified tailings paste backfilling system of Wushan Copper Mine has a smooth process, excellent backfilling technical indicators, which exceeding the design and construction requirements, and the 28 d strength of the backfilling sample can reach more than 4 MPa, which meets the backfilling strength requirements during the mining process. The reliable operation of the backfill system and the stable process parameters greatly improve the quality of the backfilling stope and provide a safety guarantee
for the further realization of safe and efficient mining. |