Surface soil replacing material for opencast coal mine

Abstract

The invention relates to a surface soil replacing material for an opencast coal mine, belonging to the field of ecological environment materials for land rehabilitation and ecological reconstruction techniques. The material is mainly prepared from the following components in percentage by weight through mixing: 30%-40% of surface soil, 20%-50% of mild clay, 30%-50% of sandy soil, 10%-20% of mixed soil, 0.1%-0.5% of organic matters (cow and sheep manure) and 0.1%-0.5% of modified straws. According to an improved formula, the basic characteristics of soil are maintained, the physical, chemical and biological characteristics of an original surface soil replacing material are improved, and the growth performance and stress resistance of plants are improved; and the surface soil replacing material is a specific material for realizing the land rehabilitation and ecological reconstruction of rehabilitation regions of the opencast coal mine.

Description

technical field [0001] The invention belongs to the field of ecological environment materials used for land reclamation and ecological reconstruction technology, and particularly relates to a surface soil material for replacement in land reclamation and ecological reconstruction of open-pit coal mine dumps with thin topsoil layers. [0002] technical background [0003] Surface coal mining requires stripping of the rock above, especially in deeper open pit mines, which tend to take up a lot of land. Relevant studies have shown that 10,000 tons of open-pit coal mining will destroy about 0.22hm of land 2 , including 0.12hm of land damaged by excavation 2 , the land occupied by the outer dump site is 0.1hm 2 , the area of ​​damage to the land is 2-11 times that of underground mining. Coal mining produces a large amount of coal gangue, and there are heavy metals such as Cu, Zn, Cd, Pb and other harmful substances in the coal gangue. These harmful substances enter the ground wi...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of lack of topsoil resources in the process of land reclamation and ecological reconstruction in open-pit coal mines, which cannot meet the requirements of restoring vegetation growth. It has the advantages of high content, simple configuration and operation, and no pollution. It can replace the topsoil required in the land reclamation of open-pit coal mine dumps in eastern Inner Mongolia, and can ensure the normal growth of vegetation, thereby restoring the ecological environment of open-pit mines as soon as possible.

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