Method for rapidly hardening, pelletizing and filling tailings of abandoned open pit

Abstract

The invention provides a method for rapidly hardening, pelletizing and filling tailings of a waste open pit. Comprising the following steps: S1, settling and thickening all tailings; s2, underflow deep dehydration; s3, carrying out rapid hardening, cementing and pelletizing; s4, solidifying and stacking the pellets; s5, transporting and stacking in an open pit; s6, soil dressing covering and ecological restoration. The method comprises the following steps: deeply dehydrating all tailings, adding a gelling agent and an accelerator, forming tailings pellets with a certain size by adopting a pelletizer, and transporting the tailings pellets to an open pit for mechanical stacking and discharging after rapid coagulation. A large number of pores among tailings pellets realize the light weight of a stacking body, and the pressing load on an open pit isolation ore pillar is reduced; a secondary reconstructed water source conservation body is formed, the surrounding hydrological environment of the open pit is not damaged, and ecological restoration of the open pit is facilitated; no bleeding exists in an open pit, the device is not affected by rainwater soaking when encountering rainfall, accumulated water can be rapidly filtered and discharged, and the key problems that the concentration of slurry conveyed by a tailing cemented filling pipeline in the open pit is low, bleeding is much, the strength is ineffective due to rainfall influence, and drainage is difficult can be effectively solved.

Description

technical field [0001] The invention relates to the field of mining open pit filling, in particular to a quick-setting ball filling method for tailings in abandoned open pits. Background technique [0002] Open pits are formed after open-pit mining in mines. On the one hand, abandoned open-pit pits cause damage to the ecological environment of the mining area. . In addition, the high and steep slopes of open pits are easily induced to collapse due to weathering erosion and underground mining disturbances, threatening the stability of surface structures and underground production systems. [0003] The use of mine tailings to fill open pits can achieve the dual purpose of ecological management of open pits and efficient utilization of tailings. Filling the tailings into the open pit generally requires solidification and condensation, so by adding a gelling agent and stirring, a slurry with a concentration of 60% to 80% is prepared and transported to the open pit for discharg...

AI Technical Summary

Problems solved by technology

After deep dehydration of the whole tailings, adding gelling agent and quick-setting agent, using a rolling pelletizing device to form a certain size of tailings pellets, which are quickly condensed and then transported to the open pit for stacking. There is no bleeding in the open pit, It is not affected by rainwater immersion even when it encounters rainfall, and it can quickly filter and discharge accumulated water, which can effectively solve the key problems such as low slurry concentration, excessive bleeding, failure of rainfall-affected strength, and drainage difficulties in conventional tailings cemented filling pipelines in open pits.

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