Section reconstruction structure and method of coal gangue artificial soil

Abstract

The invention provides a section reconstruction structure and method for coal gangue artificial soil, and the method comprises the steps: carrying out surface soil layering treatment on a land reclamation area, laying coarse-grained gangue at the bottom of the land reclamation area to form a coarse-grained gangue layer, and the particle size of the coarse-grained gangue is 4-6cm; coal gangue artificial soil covers the coarse-grain gangue layer to form a coal gangue artificial soil layer, and the thickness of the coarse-grain gangue layer is smaller than that of the coal gangue artificial soil layer. The coal gangue artificial soil comprises coal gangue, local soil, organic fertilizer, biochar and fungicide, and the mass ratio of the coal gangue to the coal gangue artificial soil layer is 60%. The coal gangue soil utilization benefit of the mining area can be improved, the cost can be saved while the crop growth effect is guaranteed, and the method is easy to operate, practical and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of coal gangue soil utilization, and in particular to a cross-section reconstruction structure and method of coal gangue artificial soil. Background Art

[0002] Gangue, the primary solid waste resource in coal mines, offers diverse applications due to its unique properties. As a material containing carbon and mineral elements, it has the potential to be used as artificial soil. By effectively blending and applying key soil-improving materials, it is possible to achieve artificial soils with optimal structure and function, meeting the needs of optimal crop growth, at a specific gangue dosage. This lays a solid foundation for reducing the amount of imported soil transported during coal mine land reclamation and improving ecological restoration efforts in mining areas based on local conditions.

[0003] In actual land reclamation applications, differences in the base conditions of artificial soil application can lead to differences in vegetation growth in the planting layer through the effects of moisture and nutrients. Considering the impact of the profile structure of gangue artificial soil on vegetation growth, and considering project quality, cost input, and site realities, the optimal reclamation soil profile structure based on gangue artificial soil is selected. This is of great significance for improving the benefits of gangue soil utilization in mining areas and enhancing the quality and efficiency of land reclamation projects in mining areas.

[0004] In the existing technology, most of the research focuses on the nutrient properties and plant growth effects of coal gangue artificial soil itself, but there is little research on the soil profile structure at a certain depth, which is not conducive to the more economical and efficient implementation of coal-based solid waste ecological restoration and utilization projects. Summary of the Invention

[0005] The present invention aims to address, at least to a certain extent, one of the technical problems in the related art. To this end, embodiments of the present invention provide a structure and method for reconstructing the profile of artificial soil from coal gangue, which can improve the efficiency of soil utilization of coal gangue in mining areas, while ensuring crop growth and saving costs.

[0006] In one embodiment of the present invention, a method for reconstructing a profile of artificial soil made of coal gangue is provided, comprising the following steps:

[0007] The surface soil of the land reclamation area is stratified, and coarse-grained gangue is laid at the bottom of the land reclamation area to form a coarse-grained gangue layer with a particle size of 4 to 6 cm; coal gangue artificial soil is covered on top of the coarse-grained gangue layer to form a coal gangue artificial soil layer.

[0008] In some embodiments, the gangue artificial soil includes gangue, local soil, organic fertilizer, biochar and bacterial agent, and the mass of the gangue accounts for 60% of the gangue artificial soil layer.

[0009] In some embodiments, the particle size of the coal gangue is less than 5 mm, wherein the mass proportion of the coal gangue with a particle size less than 2 mm is more than 60%.

[0010] In some embodiments, the mass ratio of the local soil, biochar, bacterial agent and organic fertilizer is 35-45:0.5-1.5:0.002-0.003:3-7.

[0011] In some embodiments, the thickness of the coarse-grained gangue layer is less than the thickness of the coal gangue artificial soil layer.

[0012] In some embodiments, the thickness of the coarse-grained gangue layer is 2 / 5 of the total thickness of the coarse-grained gangue layer and the gangue artificial soil layer.

[0013] In some embodiments, the thickness of the coarse-grained gangue layer is 20 cm, and the thickness of the gangue artificial soil layer is 30 cm.

[0014] In some embodiments, coarse-grained gangue with a particle size of 4 to 6 cm is obtained by sieving, and local soil, organic fertilizer, biochar and microbial agent are evenly mixed by turning the pile.

[0015] In some embodiments, the organic fertilizer is farmyard manure or commercial organic fertilizer, and the bacterial agent includes Bacillus licheniformis and Bacillus megaterium.

[0016] On the other hand, an embodiment of the present invention proposes a profile reconstruction structure of coal gangue artificial soil, including: a coarse-grained gangue layer and a coal gangue artificial soil layer, the coarse-grained gangue layer is located at the bottom of the land reclamation area, the coarse-grained gangue layer includes filled and piled coarse-grained gangue, and the particle size of the coarse-grained gangue is 4 to 6 cm; the coal gangue artificial soil layer covers the coarse-grained gangue layer, the thickness of the coal gangue artificial soil layer is greater than the thickness of the coarse-grained gangue layer, the coal gangue artificial soil layer includes coal gangue, local soil, organic fertilizer, biochar and bacterial agent, and the mass of the coal gangue accounts for 60% of the coal gangue artificial soil layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings.

[0018] in:

[0019] Figure 1 Schematic diagram of the cross-section reconstruction structure of the coal gangue artificial soil according to an embodiment of the present invention;

[0020] Figure 2 This is a comparison diagram of the cross-sectional reconstruction structures of three types of coal gangue artificial soil in Example 1 of the present invention;

[0021] Reference numerals:

[0022] 1. Artificial soil layer of coal gangue; 2. Coarse-grained gangue layer. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0024] The following describes the cross-section reconstruction structure and method of gangue artificial soil according to an embodiment of the present invention with reference to the accompanying drawings.

[0025] like Figure 1 As shown, an embodiment of the present invention provides a profile reconstruction method of gangue artificial soil, comprising the following steps:

[0026] The surface soil of the land reclamation area is stratified, and coarse-grained gangue is laid at the bottom of the land reclamation area to form a coarse-grained gangue layer 2, with a particle size of 4 to 6 cm; gangue artificial soil is covered on top of the coarse-grained gangue layer 2 to form a gangue artificial soil layer 1, and plants are planted and conventional field management is implemented.

[0027] The method of the embodiment of the present invention can improve the benefits of soil utilization of coal gangue in mining areas, while ensuring the growth of crops and saving costs. The method is simple to operate, practical and low in cost.

[0028] The embodiment of the present invention studies plant growth under various soil profile structures, and selects a coal gangue artificial soil profile reconstruction structure with better vegetation growth support and lower engineering implementation cost, thereby promoting the engineering promotion and application of coal gangue artificial soil technology.

[0029] The embodiment of the present invention can achieve normal growth of planted plants by selecting coarse-grained gangue with a particle size of 4 to 6 cm.

[0030] In some embodiments, the gangue artificial soil includes gangue, local soil, organic fertilizer, biochar and bacterial agent, and the mass of the gangue accounts for 60% of the gangue artificial soil layer 1 .

[0031] Among them, organic fertilizer is used to provide basic organic nutrients and mineral elements, biochar is used to improve soil quality, and bacterial agents are used to improve soil texture and nutrient status.

[0032] By limiting the mass proportion of the gangue to 60% of the gangue artificial soil layer 1 , the cost can be reduced to the greatest extent while ensuring the normal growth of plants.

[0033] In some embodiments, the particle size of the coal gangue is less than 5 mm, wherein the mass proportion of the coal gangue with a particle size less than 2 mm is more than 60%.

[0034] In some embodiments, the mass ratio of local soil, biochar, bacterial agent, and organic fertilizer is 35-45: 0.5-1.5: 0.002-0.003: 3-7. Within this ratio range, plants are in an optimal growth state.

[0035] In some embodiments, the thickness of the coarse-grained gangue layer 2 is less than the thickness of the coal gangue artificial soil layer 1 .

[0036] In some embodiments, the thickness of the coarse-grained gangue layer 2 is 2 / 5 of the total thickness of the coarse-grained gangue layer 2 and the gangue artificial soil layer 1 .

[0037] In some embodiments, the thickness of the coarse-grained gangue layer 2 is 20 cm, and the thickness of the gangue artificial soil layer 1 is 30 cm.

[0038] In some embodiments, coarse-grained gangue with a particle size of 4 to 6 cm is obtained by sieving, and local soil, organic fertilizer, biochar and microbial agent are evenly mixed by turning the pile.

[0039] Furthermore, the local soil, organic fertilizer, biochar and microbial agent can be mixed by using a mixer or by dumping them in a pile using an excavator or a forklift.

[0040] In some embodiments, the organic fertilizer is farmyard manure or commercial organic fertilizer, and the microbial agent includes fungi mainly including Bacillus licheniformis and Bacillus megaterium.

[0041] On the other hand, an embodiment of the present invention proposes a profile reconstruction structure of coal gangue artificial soil, including: a coarse-grained gangue layer 2 and a coal gangue artificial soil layer 1, wherein the coarse-grained gangue layer 2 is located at the bottom of the land reclamation area, and the coarse-grained gangue layer 2 includes filled and stacked coarse-grained gangue, and the particle size of the coarse-grained gangue is 4 to 6 cm; the coal gangue artificial soil layer 1 covers the coarse-grained gangue layer 2, and the thickness of the coal gangue artificial soil layer 1 is greater than the thickness of the coarse-grained gangue layer 2. The coal gangue artificial soil layer 1 includes coal gangue, local soil, organic fertilizer, biochar and bacterial agent, and the mass of coal gangue accounts for 60% of the coal gangue artificial soil layer 1.

[0042] The embodiment of the present invention can improve the efficiency of soil utilization of coal gangue in mining areas by setting a coarse-grained gangue layer 2 and a coal gangue artificial soil layer 1, and selecting coarse-grained gangue with a particle size of 4 to 6 cm, thereby ensuring crop growth effects and saving costs.

[0043] The present invention is further described below through specific examples.

[0044] Example 1

[0045] Using the coal gangue artificial soil with 60% coal gangue content selected in the early stage as the main material (the main heavy metal content in the coal gangue raw materials and coal gangue artificial soil used is lower than the agricultural land soil pollution risk screening value (pH>7.5) in GB 15618), soil structure layout and corn planting will be carried out in early June 2024. Figure 2 As shown, the following three soil structures were used for planting experiments:

[0046] (1) 50 cm thick coal gangue artificial soil.

[0047] (2) 30 cm thick coal gangue artificial soil + 20 cm thick bottom coarse-grained gangue (particle size 4 to 6 cm).

[0048] (3) 30 cm thick coal gangue artificial soil + 20 cm thick bottom fine-grained gangue (particle size less than 1 cm).

[0049] Corn growth monitoring was carried out in August 2024. The test results are shown in Table 1.

[0050] Table 1

[0051] Serial number Soil structure Average plant height (cm) Average ground diameter (mm) 1 50cm thick coal gangue artificial soil 118.46 22.12 2 30cm thick coal gangue artificial soil + 20cm thick bottom fine-grained gangue 93.24 17.20 3 30cm thick coal gangue artificial soil + 20cm thick bottom coarse-grained gangue 106.20 18.42

[0052] The results show:

[0053] Soil structure (1): The corn plant height and ground diameter in the 50cm thick coal gangue artificial soil are the largest and the growth is the best.

[0054] Soil structure (2): The corn plant height and ground diameter values in the treatment with 30 cm thick coal gangue artificial soil + 20 cm thick bottom fine-grained gangue were the lowest, indicating that its growth was the weakest.

[0055] Soil structure (3): The plant height and ground diameter of corn treated with 30 cm thick coal gangue artificial soil + 20 cm thick bottom coarse-grained gangue were lower than those of soil structure (1), but the values were close.

[0056] From the perspective of crop growth effect and project cost, it is recommended to use a 30cm thick coal gangue artificial soil + bottom coarse-grained gangue treatment mode in the project, that is, soil structure (2). Coal gangue artificial soil can be used on a flat site directly backfilled with large-grained coal gangue, and the use of a 30cm thick coal gangue artificial soil can ensure the normal growth of vegetation.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0059] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0060] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0061] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0062] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for reconstructing the profile of coal gangue artificial soil, characterized in that: The steps include: Carry out stratification of the surface soil in the land reclamation area, and lay coarse-grained gangue at the bottom of the land reclamation area to form a coarse-grained gangue layer. The particle size of the coarse-grained gangue is 4 to 6 cm. The coarse-grained gangue layer is covered with coal gangue artificial soil to form a coal gangue artificial soil layer.

2. The cross-section reconstruction method of gangue artificial soil according to claim 1, characterized in that: The gangue artificial soil includes gangue, local soil, organic fertilizer, biochar and bacterial agent, and the mass of the gangue accounts for 60% of the gangue artificial soil layer.

3. The cross-section reconstruction method of gangue artificial soil according to claim 2, characterized in that: The particle size of the coal gangue is less than 5 mm, wherein the mass proportion of the coal gangue with a particle size less than 2 mm is more than 60%.

4. The method for reconstructing the profile of gangue artificial soil according to claim 2, characterized in that: The mass ratio of the local soil, the biochar, the bacterial agent and the organic fertilizer is 35-45:0.5-1.5:0.002-0.003:3-7.

5. The cross-section reconstruction method of gangue artificial soil according to claim 1, characterized in that: The thickness of the coarse-grained gangue layer is less than the thickness of the coal gangue artificial soil layer.

6. The method for reconstructing the profile of coal gangue artificial soil according to claim 1, characterized in that: The thickness of the coarse-grained gangue layer is 2 / 5 of the total thickness of the coarse-grained gangue layer and the gangue artificial soil layer.

7. The method for reconstructing the profile of gangue artificial soil according to claim 1, characterized in that: The thickness of the coarse-grained gangue layer is 20 cm, and the thickness of the coal gangue artificial soil layer is 30 cm.

8. The method for reconstructing the profile of gangue artificial soil according to claim 2, characterized in that: Coarse-grained gangue with a particle size of 4 to 6 cm is obtained by sieving, and the local soil, the organic fertilizer, the biochar and the bacterial agent are evenly mixed by turning the pile.

9. The method for reconstructing the profile of coal gangue artificial soil according to claim 2, characterized in that: The organic fertilizer is farmyard manure or commercial organic fertilizer, and the bacterial agent includes Bacillus licheniformis and Bacillus megaterium.

10. A cross-section reconstruction structure of coal gangue artificial soil, characterized in that: include: A coarse-grained gangue layer, the coarse-grained gangue layer being located at the bottom of the land reclamation area, the coarse-grained gangue layer comprising filled and piled coarse-grained gangue, the particle size of the coarse-grained gangue being 4 to 6 centimeters; A gangue artificial soil layer, wherein the gangue artificial soil layer covers the coarse-grained gangue layer, the thickness of the gangue artificial soil layer is greater than the thickness of the coarse-grained gangue layer, the gangue artificial soil layer comprises gangue, local soil, organic fertilizer, biochar and bacterial agent, and the mass of the gangue accounts for 60% of the gangue artificial soil layer.

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