Interlayer backfill method of abandoned open-pit slag and mud

Abstract

The application discloses a method for backfilling waste open-pit pits with mud and mud interlayers, which includes the following steps: dumping construction muck into the pit, the volume of the dumped construction muck not exceeding 3 / 4 of the volume of the pit; dumping into the pit Slurry, until the mud completely covers the construction debris; the gas is fed into the bottom of the pit through the pipeline, and the temperature of the gas is 30 ° C ~ 40 ° C; when the water in the pit is dried, continue to pour mud into the pit until the mud is completely covered Construction dregs, and then continue to feed gas at 30°C to 45°C to the bottom of the pit, and repeat the above process for 5 to 8 times; pull out the pipe from the construction dregs, and a cavity is formed in the construction dregs after the pipe is pulled out , Pour a mixture of soil and gravel into the cavity; use a road roller to roll the construction dregs. The invention has the following beneficial effects: the repaired mine pit can not only completely fill the mine pit, but also the surface of the filled mine pit can be used to plant crops, and subsequent mine pits will not subside.

Description

technical field [0001] The invention relates to the field of environmental treatment, in particular to a method for backfilling an abandoned open-pit pit with slag and mud interlayers. Background technique [0002] Many mining areas left a lot of abandoned open pits after mining ores. Many of these open pits were used as fish ponds to raise fish. At that time, due to lack of water in many areas, water could not accumulate in the pits, so these pits It is often in an exposed state, and the exposed mine pit not only has a huge potential safety hazard, but also greatly reduces the utilization rate of the soil. [0003] Patent CN110144907A provides a method of using construction dregs to repair mine pits, but this repair method is only used for repairing in humid and rainy areas, that is, when the mine pit itself contains a large amount of water, it is repaired, but for dry and rainless areas Mine pits (that is, with little or no water in the pit), this repair method is not app...

AI Technical Summary

Problems solved by technology

[0002] Many mining areas left a lot of abandoned open pits after mining ores. Many of these open pits were used as fish ponds to raise fish. At that time, due to lack of water in many areas, water could not accumulate in the pits, so these pits It is often exposed, and exposed mines not only pose a huge safety hazard, but also greatly reduce the utilization rate of the soil

[0003] Patent CN110144907A provides a method of using construction dregs to repair mine pits, but this repair method is only used for repairing in humid and rainy areas, that is, when the mine pit itself contains a large amount of water, it is repaired, but for dry and rainless areas Mine pits (that is, pits with little or no water content), this repair method is not applicable