Technical treatment method for preventing and treating heavy metal pollution of underground backfill of mine to underground water

Abstract

The invention relates to a technical treatment method for preventing and treating heavy metal pollution of underground backfill of a mine to underground water. The technical treatment method comprises the following steps: S1, treating a mixed backfill; S2, laying the mixed backfill in a multi-layer vertical stacking mode, and laying a layer of ceramic nanometer material between any two adjacent filling layers; and S3, arranging a bentonite blocking layer with a certain thickness on the periphery of the multiple mixed backfill layers to prevent underground water from permeating. The mixed backfill material layers and the ceramic nanometer material layers are arranged, the ceramic nanometer materials are mixed in each mixed backfill material layer to adsorb, passivate and stabilize heavy metal ions in backfill materials and water, and meanwhile polluted underground water is thoroughly prevented from spreading outwards by means of the bentonite blocking layer. Therefore, heavy metal ions carried in the backfill can be effectively removed and dissolved in the underground water, so that pollution to the underground water is thoroughly avoided.

Description

technical field [0001] The invention relates to a technical treatment method for preventing heavy metal pollution of underground water caused by underground mine backfilling. Background technique [0002] During the mining process of many non-ferrous metal mines, or when the underground mineral deposits are mined and hollowed out, the goaf needs to be backfilled to prevent the goaf from collapsing; the backfill is generally the ore rock mass and rock mass destroyed during the mining process. Waste slag, etc., the surface of these backfilled solid waste particles may contain a large amount of heavy metal elements. When the groundwater level rises and submerges the above-mentioned backfill filling, due to the natural dissolution and leaching of groundwater, the heavy metal elements on the surface of the backfill filling Will be dissolved in groundwater, thereby causing heavy metal pollution to groundwater; At present, for the above-mentioned serious problems, there is no effec...

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Problems solved by technology

[0002] During the mining process of many non-ferrous metal mines, or when the underground mineral deposits are mined and hollowed out, the goaf needs to be backfilled to prevent the goaf from collapsing; the backfill is generally the ore rock mass and rock mass destroyed during the mining process. Waste slag, etc., the surface of these backfilled solid waste particles may contain a large amount of heavy metal elements. When the groundwater level rises and submerges the above-mentioned backfill filling, due to the natural dissolution and leaching of groundwater, the heavy metal elements on the surface of the backfill filling will be dissolved into groundwater, thereby causing heavy metal pollution to groundwater; at present, for the above-mentioned serious problems, there has not been an effective prevention and treatment method, and it is urgent to wait for a solution

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