Desert treatment method

Abstract

The invention provides a desert treatment method. The treatment method comprises the following steps: determining and excavating a treatment area; laying an impermeable layer, respectively laying a slope-surface impermeable layer and a bottom impermeable layer on the slope surface and the bottom surface of the excavated area to be treated; laying a water storage layer on the impermeable layer, andirrigating the water storage layer with mine water subjected to harmless treatment, wherein the water storage layer is a first coal gangue layer and / or a first sand layer; burying a water blocking layer on the water storage layer, wherein the water blocking layer comprises a plurality of layers of second coal gangue layers; laying an isolation layer on the water blocking layer and carrying out rolling and leveling; laying a water retaining layer on the isolation layer, wherein the water retaining layer is a third coal gangue layer or a mixture of coal gangue and a water retention agent; covering the water retaining layer with a soil matrix layer to an elevation, and carrying out rolling and leveling; and planting plants and carrying out breeding management. According to the desert treatment method, the desert soil structure is changed in a designated desert treatment area by utilizing the high water retention of the coal gangue, and plants suitable for climate-zone site conditions areselected for treating and greening the desert.

Description

technical field [0001] The invention relates to the field of desert control, in particular to a desert control method. Background technique [0002] Coal gangue is a kind of black rock with low carbon content associated with coal during the coal formation process, and it is a solid waste produced in the process of coal mining and washing. Coal gangue contains a certain amount of combustible coal, SiO 2 and Al 2 o 3 The content is more than 50%, and also contains a certain amount of CaO, MgO, Fe 2 o 3、 K 2 O and Na 2 O and other metal oxides are a mixture of various minerals. It includes excavation gangue during roadway excavation, gangue extracted from roof, floor and interlayer during mining, and gangue picked out during coal washing. The amount of gangue discharged from the Kouqian coal mine accounts for about 8%-20% of the coal mining amount, with an average of about 12%. The coal gangue produced in the process of coal mining and coal washing can reach 70% of th...

AI Technical Summary

Problems solved by technology

In addition, most coal gangue contains pyrite. After oxidation and rainwater leaching, sulfuric acid will be produced, making the environment acidic, and sometimes strongly acidic. These strongly acidic liquids will further chemically react with gangue to entrain harmful trace elements. Infiltrate into the soil, thus aggravating the pollution of the soil