A tailings processing and filling method

Abstract

The invention discloses a tailings disposing and filling method and belongs to the field of tailings utilization and disposal. The method includes: grading tailing pulp to obtain fine-particle tailings pulp and coarse-particle tailings; dewatering the fine-particle tailings pulp and the coarse-particle tailings pulp respectively according to application to obtain fine-particle tailings and fine aggregate and coarse-particle tailings for granulation, mortar and dry-mixed mortar; sintering the fine-particle tailings at high temperature, and adding a binding material into the coarse-particle tailings for granulation, mortar and dry-mixed mortar to obtain coarse aggregate, a mortar material and a dry-mixed mortar material; mixing the coarse aggregate and the fine aggregate, conveying the samedown into a well through a filling well, conveying the mortar material down into the well through a filling pipe, mixing, and then filling; conveying the dry-mixed mortar material down into the well to be mixed with pipe flushing water to prepare a dry-mixed mortar material mixture, mixing the mixture with the aggregate, and filling. By the method, treating and hardening time of the filling material can be shortened, strength of a filled body can be enhanced, downhole operation conditions can be improved, and pollution of underground environment can be reduced.

Description

technical field [0001] The invention belongs to the technical field of utilization and disposal of tailings, and in particular relates to a treatment and filling method of tailings. Background technique [0002] With the development of the economy, the society's demand for mineral products has increased significantly, and the grade of available mineral products has gradually decreased. The scale of mineral development has increased accordingly, and the amount of tailings produced has continued to increase. Problems such as tailings stockpiling occupy a large area, serious environmental pollution, and many safety hazards have become increasingly prominent. The comprehensive utilization of tailings is the fundamental method to solve the above problems. The utilization methods mainly include recovery of valuable components, production of building materials, tailings filling, etc. Among them, filling goafs with tailings is an effective way to utilize tailings in large quantities...

AI Technical Summary

Problems solved by technology

In order to ensure the fluidity of the filling material, the mass concentration of solid materials in the filling material generally does not exceed 70%. If the mass concentration continues to increase, self-flow will be difficult, and pumping is required to further increase the cost

However, under the condition of 70% mass concentration, the volume concentration of solid material is actually only 45% to 50%, and more than half of the volume of the filling material is occupied by water. The reaction will consume part of the water, and the remaining unconsumed part will remain inside the filling body to form pores, thereby reducing the strength of the filling body

Increasing the mass concentration of solids in the filling material can increase the final strength of the filling body, but there is a limit to the increase of the mass concentration. This limit is that it cannot exceed the fluidity requirements of fluid transportation, otherwise it will not flow smoothly in the pipeline and cannot be transported. down the well

The fluidity of the filling material is high, and some water will be secreted and fine particles will be precipitated on the surface after filling to the stope. Therefore, stricter filling and isolation measures are required. The construction volume is large, the hardening speed of the filling body is slow, and the surface of the filling body needs to be It takes a long time to load, which seriously affects mining efficiency

However, to increase the strength of the filling body under the premise of ensuring the fluidity of the filling material, the only way to increase the cost is to increase the content of the cementitious material.

In addition, the construction cost of the cemented filling system is high, and it is difficult to deal with pipeline blockage. Once the pipe is blocked, it will have a great impact on production and safety.

After each filling, the pipeline needs to be strictly cleaned, and a large amount of flushing water and mixed mud and sand need to be collected and pumped by special facilities, which deteriorates the downhole operating environment

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