Ecological restoration method for strong acid tailings abandoned land

Abstract

The invention discloses an ecological restoration method for a strong acid tailings abandoned land. The method includes the steps that a site is leveled and cleaned and then covered with neutral slag from a metal mine environment-friendly treatment system; a compound fertilizer, an organic fertilizer and artificial soil are added to the covering layer so as to improve the fertility of the covering layer; resistant plants are screened and subjected to seedling raising; planting is conducted in stages through a grass-shrub-arbor combined repairing mode, grass seeds are sown first, arbor and shrub nutrient bag seedlings are planted after the grass seeds sprout, and then tending management is conducted. According to the method, the neutral slag creatively serves as borrowed soil to cover a test field, waste is used for treating waste, and the effects of stabilizing heavy metal ions and reducing acidic mine wastewater are achieved. By gradually building an artificial vegetation community, natural ecological succession is achieved, generation of the acidic mine wastewater is reduced or even isolated from the source, the neutralization cost is reduced, and a stable, safe and self-maintained vegetation ecological system is built on the strong acid tailings abandoned land.

Description

technical field [0001] The invention relates to ecological restoration technology, in particular to an ecological restoration method for waste land with strong acid tailings. Background technique [0002] Mining activities result in the discharge and storage of a large number of waste rock piles, which not only destroy and occupy a large amount of land resources, but also because most of the non-ferrous metal mine strata contain various types of metal sulfides, these metal sulfides are used in mining activities Oxidation in contact with air produces sulfuric acid, and the extremely acidic environment will intensify the dissolution and poisoning of heavy metal ions. Therefore, the soil of abandoned mine tailings has certain particularities, and its physical and chemical properties are quite different from normal soil, generally showing extreme acidic conditions (pH<3.0), heavy metal pollution (Cu, Pb, As, Cd, etc. Serious), lack of nutrients, poor soil water and fertilize...

AI Technical Summary

Problems solved by technology

However, the strong acidity, high content of heavy metals, and lack of nutrients in the tailings wasteland often hinder the growth of plants, resulting in difficult survival, low biomass, short plants, and slow growth.

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