Composite layer, method for controlling acidization of mining slag heap yard and revegetation method

Abstract

The invention provides a composite layer. The composite layer is used for controlling acidization of a mining slag heap yard and comprises a flow guiding layer, a first nonwoven fabric layer, a sand and stone layer, a second nonwoven fabric layer and an isolation layer which are arranged in sequence. The invention further provides a method for controlling the acidization caused by the mining slag heap yard and a revegetation method of the mining slag heap. By establishing a buffer isolation zone between a mining slag heap yard acidization surface and a plantation layer, the acid water containing a variety of heavy metal ions can be blocked and isolated, sulphur minerals in the lower layer can be effectively prevented from being further oxidized and acidified, the acid liquor in the lower layer can be prevented from permeating reversely into the upper layer so as not to pollute the plantation layer and poison plants under the action of soil capillaries. By reconstructing the plantation layer on the composite layer, a long-term stable fit environment can be created for the growth and development of plants, the vegetation degradation can be avoided, and the purposes of ecological remediation, environmental improvement and soil and water conservation can be achieved.

Description

technical field [0001] The invention belongs to the technical field of ecological restoration, and in particular relates to a composite layer, a method for acid resistance control of a mine dregs storage yard, and a vegetation reconstruction method. Background technique [0002] The open-pit mining of metal mines poses a threat to the environment of the mining area, especially the muck that is stripped from the veins and transported during mining is piled up like a mountain, forming a huge muck dump. Because the stockyard contains a large amount of sulfide and paragenetic ore, it has been exposed for a long time, and under the joint action of air and rainwater, the sulfur minerals are oxidized and the soil is acidified. The way of flow and reverse osmosis invades the surface, leading to further acidification of the surface layer and the loss of heavy metals, causing heavy metal pollution to pollute the surrounding environment and deteriorating the soil environment. At prese...

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Problems solved by technology

A single lime spread is difficult to neutralize the acidic solution of continuous reverse osmosis in the lower layer, and cannot prevent the further oxidation and re-acidification of sulfur minerals; a large

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