Screening method for replacing surface soil of strip mine reclamation

Abstract

The invention relates to a screening method for replacing surface soil of strip mine reclamation and belongs to the technical field of land reclamation and ecological reconstruction and the field of ecological environment materials. The screening method includes the steps that according to detailed geological and occurrence conditions of a stripped overburden rock-soil layer of a strip mine, firstly, the possible soil layers for replacing surface soil are screened out primarily through analyzing geology and rock-soil parameters of all overburden rock-soil layers; then, through analyzing physical, chemical, biological and environmental characteristics of all the soil layers, the soil layer is finally screened out, wherein the soil layer is close to the surface soil in characteristic, the basic soil properties are good, the rate of emergence is high, then a soil conditioner is selected to be mixed with the material for replacing the surface soil to serve as replacing surface soil. According to the replacing surface soil, solid waste treating and strip mine waste dump reclamation can be organically combined, the dual purposes of reducing solid waste and finishing waste dump reclamation are achieved, the solid waste is effectively utilized, the ecological environment is improved, and social, economical and environmental benefits are high.

Description

technical field [0001] The invention belongs to the technical field of mining, environment, ecology, and solid waste disposal and utilization, and particularly relates to the screening and improvement method for surface soil layer replacement materials for open-pit coal mines in areas with thin surface soil layers. Background technique [0002] Coal is the most important energy source in China, and open-pit mining has the characteristics of low mining cost, safety, and high resource utilization rate. Therefore, the proportion of open-pit coal mining in my country is increasing day by day. Generally speaking, the area of ​​land damage caused by open-pit mining is 2- 11 times, because the open-pit mining process needs to strip all the rock and soil above the coal seam, which seriously interferes with the local ecosystem, can completely destroy the vegetation in the mining area, destroy or change the soil nutrition and microbial composition, disturb the habitat of animals and pla...

AI Technical Summary

Problems solved by technology

However, this method is not suitable for areas with thin topsoil, such as the windy and sandy areas in Northwest my country. The topsoil in this area is not only thin, but also has a certain degree of desertification. Therefore, the quality of land reclamation work in such areas At the same time, the stripping, stockpiling and backfilling of the topsoil layer according to the conventional reclamation methods will cause the loss and degradation of the topsoil resources. In addition, the dumps are distributed in steps, forming a More slopes lead to a significant increase in the area of ​​reclamation, and the amount of the original topsoil layer is obviously insufficient. Therefore, it is very necessary to find suitable alternative topsoil materials

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