Method for repairing mining wasteland by utilizing plant-microorganism synergistic activation shield slurry and sludge

Abstract

The invention provides a method for repairing a mining wasteland by utilizing plant-microorganism synergistic activation shield slurry and sludge, which comprises the following steps: injecting ozone into domestic sludge to obtain modified sludge, and uniformly mixing the modified sludge, the shield slurry, a biological bacterial fertilizer and an arbuscular mycorrhiza preparation according to a dry weight ratio of (4-5): (1-2): (0.2-0.3): (0.2-0.3) to obtain mixed slurry; carrying out filter pressing dehydration treatment on the mixed slurry, and controlling the water content to be 30-50% to obtain a mixed dried material; adding tailing sand and pioneer grass seeds into the mixed dried material, irrigating and cultivating for 7 days at room temperature to obtain a mixed plant mud cake, and crushing to obtain ecological restoration soil; adding an ecological curing agent into the ecological restoration soil to obtain cured restoration soil, and adding grass seeds into the cured restoration soil to obtain modified restoration soil; after ecological restoration soil is laid on the flat land section of the mine wasteland, grass seeds are added; the modified restoration soil is sprayed and sown on the slope section of the mine wasteland, the mine wasteland is restored through the ecological restoration soil and the modified restoration soil, and the succession cycle of ecological environment restoration is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of mine ecological restoration, and in particular relates to a method for restoring mine wasteland by utilizing plant-microorganism synergistic activation of shield mud and sludge. Background Art

[0002] Abandoned mine sites contain large amounts of low-grade waste and strippings stored on their surface, and the original soil and surface vegetation systems are severely damaged. This has resulted in large areas of exposed mining areas and severe soil erosion. Furthermore, the poor cohesiveness and fertility of the stockpiles make it difficult to form an effective soil structure, and vegetation recovery takes a long time. A key component of mine ecological restoration is the reconstruction and improvement of mine soils. The use of chemical fertilizers can improve the soil's fertility capacity to a certain extent, but chemical fertilizers alone do not improve soil texture. The application of organic fertilizers can significantly improve soil quality, but requires large quantities and is costly. Sludge, on the other hand, contains a large number of nutrients required for plant growth, and its arbuscular mycorrhizae can promote plant absorption of soil nutrients.

[0003] Therefore, how to provide a method for repairing mine wastelands by using plant-microorganism synergistic activation of shield mud and sludge, synergistically activating shield mud and sludge through plants and arbuscular mycorrhizae to release nutrients and promote plant absorption, thereby realizing the repair of mine wastelands, is a technical problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for repairing mine wasteland by using plant-microorganism synergistic activation of shield mud and sludge, so as to solve at least one of the above technical problems.

[0005] To achieve the above-mentioned purpose, the first aspect of the present invention provides a method for repairing mine wasteland by using plant-microorganism synergistic activation of shield mud and sludge, the method comprising the following steps: S1, injecting ozone into domestic sewage sludge to react and obtain modified sludge; S2, uniformly mixing the modified sludge, shield mud, biological fertilizer and arbuscular mycorrhizal preparation in a dry weight ratio of (4-5): (1-2): (0.2-0.3): (0.2-0.3) to obtain mixed mud; S3, performing filter press dehydration treatment on the mixed mud to obtain a mixed dried material, the moisture content of the mixed dried material is 30-50%; S4, adding the mixed dried material to the mixed dried material. Add tailings sand and pioneer grass seeds with a particle size of 0.5-2mm to the material, mix evenly, and cultivate at room temperature for 7 days to obtain a mixed plant mud cake; S5, crush the mixed plant mud cake to obtain ecological restoration soil; S6, add an ecological curing agent with a mass ratio of 5% to the ecological restoration soil, mix evenly, and obtain solidified restoration soil, and the moisture content of the solidified restoration soil is 60%; S7, add grass seeds to the solidified restoration soil, mix evenly, and obtain modified restoration soil; S8, after laying the ecological restoration soil on the flat section of the mine wasteland, add grass seeds, and spray the modified restoration soil on the slope section of the mine wasteland to repair the mine wasteland.

[0006] In the first aspect, in step S1, the injection amount of ozone is 0.1-0.2 g / g, and the intake amount of ozone is 1.8-2.0 L / min.

[0007] In the first aspect, in step S1, the reaction time is 20-30 minutes.

[0008] In the first aspect, in step S2, the biological fertilizer is a freeze-dried powder made from nitrogen-fixing bacteria, potassium bacteria, phosphorus bacteria, and carbon-decomposing bacteria extracted from activated sludge, wherein the ratio of the nitrogen-fixing bacteria, the potassium bacteria, the phosphorus bacteria, and the carbon-decomposing bacteria is (18-20): (8-10): (14-16): (6-10), and the effective viable bacteria count is ≥4×10 9 CFU / g.

[0009] In the first aspect, in step S4, the amount of the tailings sand added is 20-50% of the dry weight of the mixed dried material, and the amount of the pioneer grass seeds added is 1-2% of the dry weight of the mixed dried material.

[0010] In the first aspect, in step S6, the ecological curing agent includes cement, silica fume, desulfurized gypsum and electrolytic manganese slag.

[0011] In the first aspect, the mass ratio of the cement, the silica fume, the desulfurization gypsum and the electrolytic manganese slag is 3:2:3:2.

[0012] In the first aspect, in step S7, the amount of grass seeds added is 1-2% of the dry weight of the solidified remediation soil.

[0013] In the first aspect, in step S8, the ecological restoration soil is laid with a thickness of 0.5-0.7 m.

[0014] In the first aspect, in step S8, the modified remediation soil is sprayed with a thickness of 0.05-0.1 m; and the spraying method includes: spraying once every other day, for a total of three times.

[0015] Beneficial effects: The present invention provides a method for repairing mine wasteland by utilizing plant-microorganism synergistic activation of shield mud and sludge. First, ozone is injected into domestic sludge to degrade macromolecular substances in the domestic sludge to obtain easily soluble modified sludge, and the modified sludge, shield mud, biological fertilizer and arbuscular mycorrhizal preparation are uniformly mixed in a dry weight ratio of (4-5): (1-2): (0.2-0.3): (0.2-0.3), and the modified sludge and shield mud are activated by the biological fertilizer and arbuscular mycorrhiza to improve the performance of the mixed mud; secondly, the mixed mud is subjected to filter pressing and dehydration treatment, and the moisture content is controlled to 30-50% to obtain a mixed dried material, and then, the mixed mud is added. Tailings sand and pioneer grass seeds are added to the combined drying material to enhance the water-air-heat transfer efficiency and biodiversity of the mixed plant mud cake, and it is watered and cultivated at room temperature for 7 days to create living conditions for plant growth; then, the mixed plant mud cake is crushed to obtain ecological restoration soil with smaller particle size, so that it can be mixed evenly with the ecological solidifier to obtain solidified restoration soil with better performance, and grass seeds are added to the solidified restoration soil to further improve the biodiversity in the soil and create favorable conditions for soil restoration; finally, ecological restoration soil with smaller particle size is laid on the flat section of the mine wasteland, and viscous modified restoration soil is sprayed on the slope section of the mine wasteland, and combined with grass seeds to realize the ecological environment restoration succession cycle. The present invention activates shield mud and modified sludge by utilizing the synergistic effect of the root-based life community formed by biological fertilizer, arbuscular mycorrhiza and the root system of pioneer grass plants, so as to release the organic mineral elements in the modified sludge and promote the absorption of nutrients by plants. By using sand-grade solid waste from the mine on site, the permeability coefficient of the soil is increased and the water-gas-heat transfer in the soil is enhanced. The obtained ecological restoration soil and modified restoration soil are then used to cover and repair the abandoned land in the mining area, laying the foundation for ecological environmental restoration.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 The present invention provides a flow chart of a method for remediating abandoned mine land by utilizing plant-microorganism synergistic activation of shield mud and sludge. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below in conjunction with specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly presented. It should be understood by those skilled in the art that these specific embodiments and examples are for illustrating the present invention, rather than for limiting the present invention.

[0020] Throughout this specification, unless otherwise specified, the terms used herein should be understood as having the same meaning as commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the event of any conflict, the present specification shall take precedence.

[0021] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or obtained through existing methods.

[0022] See also Figure 1The present invention provides a method for repairing mine wasteland by using plant-microorganism synergistic activation of shield mud and sludge, the method comprising the following steps: S1, injecting ozone into domestic sewage sludge to react and obtain modified sludge; S2, uniformly mixing the modified sludge, shield mud, biological fertilizer and arbuscular mycorrhizal preparation in a dry weight ratio of (4-5): (1-2): (0.2-0.3): (0.2-0.3) to obtain mixed mud; S3, performing filter press dehydration treatment on the mixed mud to obtain a mixed dried material, the moisture content of the mixed dried material is 30-50%; S4, adding the mixed dried material to the mixed dried material. Add tailings sand with a particle size of 0.5-2 mm and pioneer grass seeds, mix evenly, and cultivate at room temperature for 7 days to obtain a mixed plant mud cake; S5, crush the mixed plant mud cake to obtain ecological restoration soil; S6, add an ecological curing agent with a mass ratio of 5% to the ecological restoration soil, mix evenly, and obtain solidified restoration soil, and the moisture content of the solidified restoration soil is 60%; S7, add grass seeds to the solidified restoration soil, mix evenly, and obtain modified restoration soil; S8, after laying the ecological restoration soil on the flat section of the abandoned mine land, add grass seeds, and spray the modified restoration soil on the mine slope to repair the abandoned mine land.

[0023] Specifically, the present invention provides a method for remediating mine wasteland by using plant-microorganism synergistic activation of shield mud and sludge. First, ozone is injected into domestic sludge to degrade macromolecular substances in the domestic sludge to obtain easily soluble modified sludge, and the modified sludge, shield mud, biological fertilizer and arbuscular mycorrhizal preparation are uniformly mixed in a dry weight ratio of (4-5): (1-2): (0.2-0.3): (0.2-0.3). The modified sludge and shield mud are activated by biological fertilizer and arbuscular mycorrhiza to improve the performance of the mixed mud; secondly, the mixed mud is subjected to filter press dehydration treatment, and the moisture content is controlled to 30-50% to obtain a mixed dried material, and then, Tailings sand and pioneer grass seeds are added to the mixed dried material to enhance the water-air-heat transfer efficiency and biodiversity of the mixed plant mud cake, and the mixed plant mud cake is watered and cultivated at room temperature for 7 days to create living conditions for plant growth; then, the mixed plant mud cake is crushed to obtain ecological restoration soil with smaller particle size, so that it can be mixed evenly with the ecological solidifier to obtain solidified restoration soil with better performance, and grass seeds are added to the solidified restoration soil to further improve the biodiversity in the soil and create favorable conditions for soil restoration; finally, ecological restoration soil with smaller particle size is laid on the flat section of the mine wasteland, and viscous modified restoration soil is sprayed on the slope section of the mine wasteland, and combined with grass seeds to realize the ecological environment restoration succession cycle. The present invention activates shield mud and modified sludge by utilizing the synergistic effect of the root-based life community formed by biological fertilizer, arbuscular mycorrhiza and the root system of pioneer grass plants, so as to release the organic mineral elements in the modified sludge and promote the absorption of nutrients by plants. By using the sand-grade solid waste (tailings sand) of the mine on site, the permeability coefficient of the soil is increased and the water-gas-heat transfer in the soil is enhanced. The obtained ecological restoration soil and modified restoration soil are then used to cover and repair the abandoned land in the mining area, laying the foundation for ecological environmental restoration.

[0024] It should be added that shield mud can come from engineering waste mud obtained by means of continuous wall excavation, shield machine tunneling or pile foundation excavation; sludge can come from primary sludge or residual sludge of domestic sewage sludge or water supply sludge. In addition, modified sludge can be obtained by ozone treatment of domestic sludge, or it can be silt sludge from rivers and lakes; abandoned mining sites can be abandoned exposed mines with a lack of topsoil, tailings ponds, waste rock dumps or solid waste backfill areas.

[0025] In some possible embodiments, in step S1 , the injection amount of ozone is 0.1-0.2 g / g, and the intake amount of ozone is 1.8-2.0 L / min.

[0026] In some possible embodiments, in step S1, the reaction time is 20-30 minutes.

[0027] Those skilled in the art will understand that by injecting ozone into domestic sludge, some organic pollutants and pathogens can be degraded, the hazards of organic pollutants and pathogens can be reduced, and organic matter and elements such as nitrogen, phosphorus and potassium required for plant growth can be released, thereby increasing the activity of the modified sludge, absorbing a large amount of sludge, and realizing the resource utilization of waste.

[0028] In some possible embodiments, in step S2, the biological fertilizer is a freeze-dried powder made from nitrogen-fixing bacteria, potassium bacteria, phosphorus bacteria, and carbon-decomposing bacteria extracted from activated sludge, wherein the ratio of the nitrogen-fixing bacteria, the potassium bacteria, the phosphorus bacteria, and the carbon-decomposing bacteria is (18-20): (8-10): (14-16): (6-10), and the effective viable bacteria count is ≥4×10 9 CFU / g.

[0029] This is because biological fertilizer can not only release organic elements in modified sludge, but also release organic minerals in the tailings sand added subsequently, and combine with arbuscular mycorrhizae to promote plants to absorb nutrients in the soil.

[0030] In some possible embodiments, in step S4, the amount of tailings sand added is 20-50% of the dry weight of the mixed dried material, and the amount of pioneer grass seeds added is 1-2% of the dry weight of the mixed dried material.

[0031] Those skilled in the art will understand that adding tailings sand to the mixed dry material can increase the porosity and permeability of the mixed dry material, increase the proportion of aggregates larger than 0.25 mm in the mixed dry material, and provide a water-air-heat transfer site for plant growth; pioneer grass seeds can survive in adverse environments such as resource scarcity and poor soil conditions, have strong reproductive ability and growth rate, enrich the biodiversity of the mixed plant mud cake after irrigating and cultivating for 7 days, improve the soil structure, and at the same time, combine with biological fertilizer and arbuscular mycorrhiza to accelerate the soil formation rate of the mixed plant mud cake, further enhance the nutrient content of the soil.

[0032] In some possible embodiments, in step S6, the ecological curing agent includes cement, silica fume, desulfurized gypsum and electrolytic manganese slag.

[0033] In some possible embodiments, the mass ratio of the cement, the silica fume, the desulfurization gypsum and the electrolytic manganese slag is 3:2:3:2.

[0034] Furthermore, adding an ecological curing agent (cement, silica fume, desulfurized gypsum, and electrolytic manganese slag) to the ecological restoration soil improves its properties, resulting in higher strength and permeability, creating a favorable environment for plant growth. Furthermore, the prepared cured restoration soil can be used to repair abandoned slopes and plant trees on them to prevent landslides.

[0035] In some possible embodiments, in step S7, the amount of grass seeds added is 1-2% of the dry weight of the solidified remediation soil.

[0036] Those skilled in the art will understand that adding grass seeds to solidified remediation soil can further enhance biodiversity, quickly enter a benign ecological succession cycle, and lay the foundation for improving soil conditions in the area to be remediated.

[0037] In some possible embodiments, in step S8, the laying thickness of the ecological restoration soil is 0.5-0.7m.

[0038] In some possible embodiments, in step S8, the modified remediation soil is sprayed with a thickness of 0.05-0.1 m; and the spraying method includes: spraying once every other day, for a total of three times.

[0039] The present application will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present application only and are not intended to limit the scope of the present application. The experimental methods in the following examples where specific conditions are not specified are usually measured in accordance with national standards. If there are no corresponding national standards, then the methods are carried out in accordance with general international standards, conventional conditions, or according to the conditions recommended by the manufacturer.

[0040] Example This embodiment selects the lead-zinc tailings dam for repair. The domestic sludge selected is the primary sludge of domestic sewage sludge, and the shield sludge is the waste sludge generated during the shield machine excavation process. The specific steps of its repair are as follows: (1) Ozone micro-nano bubbles were injected into the domestic sludge through a micro-nano bubble generator. The ozone injection rate was 0.2 g / g, the air intake rate was 1.8 L / min, and the reaction time was 20 min to obtain modified sludge. (2) The modified sludge, shield mud, biological fertilizer and arbuscular mycorrhizal preparation were mixed evenly at a dry weight ratio of 5:1:0.2:0.2 to obtain a mixed sludge; wherein the biological fertilizer was a freeze-dried powder formed by nitrogen-fixing bacteria, potassium bacteria, phosphorus bacteria and carbon-degrading bacteria in a mass ratio of 20:10:15:6, and the effective viable bacteria count was ≥4×10 9 CFU / g; (3) The mixed slurry is subjected to filter pressing and dehydration treatment until the moisture content is 40% to obtain a mixed dried material; (4) Adding tailings sand with a particle size of 0.5-2 mm and pioneer grass seeds to the mixed desiccated material, mixing them evenly, and watering and cultivating them at room temperature for 7 days to obtain a mixed plant mud cake; wherein the amount of tailings sand added is 50% of the dry weight of the mixed desiccated material, and the amount of pioneer grass seeds added is 2% of the dry weight of the mixed desiccated material; (5) Crushing the mixed plant mud cake to obtain ecological restoration soil; (6) Add 5% by mass of an ecological curing agent to the ecological restoration soil, mix evenly, and add water to obtain a solidified restoration soil with a moisture content of 60%; wherein the ecological curing agent is prepared by cement, silica fume, desulfurized gypsum and electrolytic manganese slag in a mass ratio of 3:2:3:2; (7) Adding grass seeds to the solidified remediation soil and mixing them evenly to obtain modified remediation soil; wherein the amount of grass seeds added is 1% of the dry weight of the solidified remediation soil; (8) Lay 0.5m thick ecological restoration soil and add grass seeds on the flat area of the lead-zinc tailings dam, and spray 0.1m thick modified restoration soil on the slope section of the lead-zinc tailings dam once every other day for a total of three times to repair the lead-zinc tailings dam.

[0041] According to the test, the vegetation rate of the repaired lead-zinc tailings dam in this embodiment can reach 89%.

[0042] Comparative Example 1 In this comparative example, modified sludge was not added to the mixed slurry, and the remaining steps were the same as in the embodiment. According to the test, the vegetation rate of the repaired lead-zinc tailings dam in this comparative example was 69%.

[0043] Comparative Example 2 In this comparative example, no biofertilizer and arbuscular mycorrhizal preparation were added to the mixed slurry, and the remaining steps were the same as in the example. According to the test, the vegetation rate of the repaired lead-zinc tailings dam in this comparative example was 72%.

[0044] Comparative Example 3 In this comparative example, no 0.5-2 mm tailings sand was added to the mixed plant mud cake, and the remaining steps were the same as in the example. Testing showed that the mixed plant mud cake in this comparative example had 52% fewer aggregates (larger than 0.25 mm) and 22% less porosity than the example.

[0045] Comparative Example 4 In this comparative example, no pioneer grass seeds were added to the mixed plant mud cake, and the remaining steps were the same as in the embodiment. According to the test, the vegetation rate of the repaired lead-zinc tailings dam in this comparative example was 77%.

[0046] In summary, compared with the prior art, the present invention has the following advantages: (1) The present invention activates shield mud and sludge through plant-microorganism (arbuscular mycorrhiza and biological fertilizer) synergistic activation, accelerates the soil formation rate, and increases biodiversity and promotes the development of arbuscular mycorrhiza under the growth drive of pioneer grass seeds. Under the joint action of plant roots and arbuscular mycorrhiza, the formation of aggregates in the soil is promoted, thereby increasing the permeability of the soil to adapt to plant growth.

[0047] (2) The present invention modifies abandoned shield mud and sludge to obtain nutrient-sufficient ecological restoration soil and modified restoration soil, and uses the ecological restoration soil and modified restoration soil to repair abandoned mine land, thereby solving the problem of lack of topsoil in the mining area and providing a guarantee for the subsequent ecological restoration of the mine.

[0048] Finally, it should be noted that the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0050] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for remediating abandoned mine land by using plant-microorganism synergistic activation of shield mud and sludge, characterized in that: The method comprises the following steps: S1. Inject ozone into domestic sludge to react and obtain modified sludge; S2. uniformly mixing the modified sludge, shield mud, biological fertilizer and arbuscular mycorrhizal preparation in a dry weight ratio of (4-5): (1-2): (0.2-0.3): (0.2-0.3) to obtain a mixed sludge; S3, performing filter pressing and dehydration treatment on the mixed slurry to obtain a mixed dried material, wherein the moisture content of the mixed dried material is 30-50%; S4, adding tailings sand with a particle size of 0.5-2 mm and pioneer grass seeds to the mixed dried material, mixing evenly, watering and cultivating at room temperature for 7 days to obtain a mixed plant mud cake; S5. crushing the mixed plant mud cake to obtain ecological restoration soil; S6. Add 5% by mass of an ecological curing agent to the ecological restoration soil, mix well, and obtain a solidified restoration soil, wherein the moisture content of the solidified restoration soil is 60%; S7, adding grass seeds to the solidified remediation soil and mixing them evenly to obtain modified remediation soil; S8. After laying the ecological restoration soil on the flat section of the abandoned mine land, grass seeds are added; and the modified restoration soil is sprayed on the slope section of the abandoned mine land to repair the abandoned mine land.

2. The method for remediating mine wasteland by utilizing plant-microorganism synergistic activation of shield mud and sludge according to claim 1, characterized in that: In step S1, the injection amount of ozone is 0.1-0.2 g / g, and the intake amount of ozone is 1.8-2.0 L / min.

3. The method for remediating mine wasteland by utilizing plant-microorganism synergistic activation of shield mud and sludge according to claim 1, characterized in that: In step S1, the reaction time is 20-30 minutes.

4. The method for remediating abandoned mine land by utilizing plant-microorganism synergistic activation of shield mud and sludge according to claim 1, characterized in that: In step S2, the biological fertilizer is a freeze-dried powder made from nitrogen-fixing bacteria, potassium bacteria, phosphorus bacteria, and carbon-decomposing bacteria extracted from activated sludge, wherein the ratio of the nitrogen-fixing bacteria, potassium bacteria, phosphorus bacteria, and carbon-decomposing bacteria is (18-20): (8-10): (14-16): (6-10), and the effective viable bacteria count is ≥4×10 9 CFU / g.

5. The method for remediating abandoned mine land by utilizing plant-microorganism synergistic activation of shield mud and sludge according to claim 1, characterized in that: In step S4, the amount of the tailings sand added is 20-50% of the dry weight of the mixed dried material, and the amount of the pioneer grass seeds added is 1-2% of the dry weight of the mixed dried material.

6. The method for remediating abandoned mine land by utilizing plant-microorganism synergistic activation of shield mud and sludge according to claim 1, characterized in that: In step S6, the ecological curing agent includes cement, silica fume, desulfurized gypsum and electrolytic manganese slag.

7. The method for remediating abandoned mine land by utilizing plant-microorganism synergistic activation of shield mud and sludge according to claim 6, characterized in that: The mass ratio of the cement, the silica fume, the desulfurized gypsum and the electrolytic manganese slag is 3:2:3:

2.

8. The method for remediating abandoned mine land by utilizing plant-microorganism synergistic activation of shield mud and sludge according to claim 1, characterized in that: In step S7, the amount of grass seeds added is 1-2% of the dry weight of the solidified remediation soil.

9. The method for remediating abandoned mine land by utilizing plant-microorganism synergistic activation of shield mud and sludge according to claim 1, characterized in that: In step S8, the ecological restoration soil is laid with a thickness of 0.5-0.7 m.

10. The method for remediating abandoned mine land by utilizing plant-microorganism synergistic activation of shield mud and sludge according to claim 1, characterized in that: In step S8, the modified remediation soil is sprayed with a thickness of 0.05-0.1 m; the spraying method includes: spraying once every other day, for a total of three times.

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