Soil structure restorer as well as preparation method and application thereof

Abstract

The invention provides a soil structure restorer as well as a preparation method and application thereof, and relates to the technical field of soil remediation. The soil structure restorer provided by the invention is prepared from the following components in percentage by weight: 0.1 to 1 weight percent of surfactant, 0.1 to 1 weight percent of foam stabilizer, 0.05 to 1 weight percent of enhancer and the balance of water, wherein the total weight of the soil structure restorer is 100 percent; the foam stabilizer is prepared from one or more of nano kaolin, nano bentonite, nano silicon dioxide, nano attapulgite and nano montmorillonite; the reinforcing agent comprises cellulose and / or cellulose derivatives. The soil structure restorer provided by the invention is short in restoration time, high in applicability, long in restoration duration time, high in technical expandability and small in environmental influence.

Description

Technical Field

[0001] The present invention relates to the technical field of soil restoration, and in particular to a soil structure restoration agent, a preparation method and application thereof. Background Art

[0002] Existing soil restoration technologies include physical improvement (screening and sorting: removing large materials and impurities in the soil to improve the texture and structure of the soil; compaction and loosening: improving the bearing capacity of the soil through compaction technology, or improving the porosity and permeability of the soil through loosening technology), biological improvement (vegetation restoration: planting cover crops or pioneer plants, such as certain legumes, which can improve the soil structure through their root structure and increase the nitrogen content in the soil through nitrogen fixation) and addition of organic materials (compost and humus: adding large amounts of organic matter such as compost and humus to increase the soil organic matter content, improve soil structure and water and fertilizer retention capacity; lignin and biochar: adding stable organic matter such as lignin and biochar can improve soil structure and enhance its carbon storage capacity in the long term).

[0003] However, the above-mentioned soil restoration technologies have problems such as long recovery time, weak adaptability, poor long-term effect, low restoration efficiency, and weak technical scalability. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a soil structure restoration agent and a preparation method and application thereof. The soil structure restoration agent provided by the present invention has short recovery time, strong applicability, long recovery duration, strong technical scalability and small environmental impact.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a soil structure restoration agent, which comprises the following components in percentage by weight, based on the total weight of the soil structure restoration agent being 100%: 0.1-1wt% of a surfactant, 0.1-1wt% of a foam stabilizer, 0.05-1wt% of an enhancer, and the balance being water;

[0007] The foam stabilizer comprises one or more of nano kaolin, nano bentonite, nano silicon dioxide, nano attapulgite and nano montmorillonite;

[0008] The reinforcing agent includes cellulose and / or cellulose derivatives.

[0009] Preferably, the surfactant includes one or more of alkyl glycosides, saponins, fatty alcohol polyoxyethylene ethers, α-olefin sulfonates, fatty alcohol polyoxyethylene ether sulfates, fatty alcohol polyoxyethylene ether carboxylates, soapberry saponins, betulin, lupeol, γ-sitosterol, betaine, coconut oil amidoacetate, palmitamidopropyl ethylenediamine and oenotheinamide.

[0010] Preferably, the content of the surfactant is 0.1-0.7 wt %.

[0011] Preferably, the particle size of the foam stabilizer is 40 to 100 nm.

[0012] Preferably, the content of the foam stabilizer is 0.1-0.7 wt %.

[0013] Preferably, the cellulose derivative comprises methyl cellulose.

[0014] Preferably, the content of the reinforcing agent is 0.05-0.8 wt%.

[0015] The present invention provides a method for preparing the soil structure restoration agent described in the above technical solution, comprising the following steps:

[0016] The surfactant, the foam stabilizer, the enhancer and water are mixed to obtain the soil structure restoration agent.

[0017] Preferably, the mixing comprises: dissolving a surfactant in water to obtain a surfactant solution; and sequentially adding a foam stabilizer and an enhancer to the surfactant solution to obtain the soil structure restoration agent.

[0018] The present invention provides the application of the soil structure restoration agent described in the above technical solution or the soil structure restoration agent prepared by the preparation method described in the above technical solution in the field of soil remediation.

[0019] The present invention provides a soil structure restoration agent. The present invention increases the bubble wall thickness and the overall strength of the bubbles through the effects of a foam stabilizer and a reinforcing agent, so that the soil structure restoration agent has high acid and alkali resistance, is not easy to break bubbles in a slurry mixed with cement and soil, and exists in the form of tiny bubbles in an unhardened slurry. In the present invention, the substances between the bubbles when the cement and soil are hardened are carbonates and hydrated calcium silicate, which on the one hand maintain the existence of a porous structure and on the other hand provide strength for the whole. The strength of carbonates and hydrated calcium silicate is relatively high, and the stress is relatively small during the use of the soil, and the porous structure can still be maintained under repeated immersion in water. The present invention has the advantages of short soil structure recovery time (7 to 12 days), strong applicability of the restoration agent (it has good recovery effects on a variety of soils, whether it is acidic soil or alkaline soil), wide applicability to soil types (sand washing tailings, riverbed mud, red mud, engineering slag and other solid wastes), strong scalability of technology (stable recovery can be achieved whether it is a small-scale test in the laboratory or enlarged to the actual scene), long recovery duration (the recovery effect can be maintained for a long time), and small environmental impact (the raw materials are degradable components and will not cause secondary pollution to the soil). BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a process flow chart of soil remediation using a soil structure restoration agent according to the present invention. DETAILED DESCRIPTION

[0021] The present invention provides a soil structure restoration agent, which comprises the following components in percentage by weight, based on the total weight of the soil structure restoration agent being 100%: 0.1-1wt% of a surfactant, 0.1-1wt% of a foam stabilizer, 0.05-1wt% of an enhancer, and the balance being water;

[0022] The foam stabilizer comprises one or more of nano kaolin, nano bentonite, nano silicon dioxide, nano attapulgite and nano montmorillonite;

[0023] The reinforcing agent includes cellulose and / or cellulose derivatives.

[0024] Taking the total weight of the soil structure restoration agent as 100%, the soil structure restoration agent provided by the present invention comprises 0.1-1wt% of a surfactant, preferably 0.1-0.7wt%. In a specific embodiment of the present invention, the content of the surfactant may be 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt% or 0.7wt%. In the present invention, the surfactant preferably comprises one or more of alkyl glycosides, saponins, fatty alcohol polyoxyethylene ethers, α-olefin sulfonates, fatty alcohol polyoxyethylene ether sulfates, fatty alcohol polyoxyethylene ether carboxylates, soapberry saponins, betulin, lupeol, γ-sitosterol, betaine, coconut oil amide acetate, palmitamide propyl ethylenediamine and oenothermide, more preferably alkyl glycosides. In the present invention, the functions of surfactants include: (1) surfactant molecular structure: surfactant molecules have two parts: hydrophilic (polar) and hydrophobic (non-polar). The hydrophilic part is usually composed of polar groups (such as carboxyl, sulfonic acid or amino groups), and the hydrophobic part is usually a long-chain hydrocarbon group; (2) reducing surface tension: when the surfactant is dissolved in water, its molecules will be arranged at the interface between water and air, with the hydrophilic end facing the water phase and the hydrophobic end facing the air phase. This arrangement can significantly reduce the surface tension of water, making it easier for water to form foam; (3) forming a monolayer: on the water surface, the surfactant molecules will form a monolayer of monolayers. This membrane structure can stabilize air bubbles and make them less likely to break; (4) formation of foam: when the aqueous solution is mechanically agitated or air is injected, the air will be wrapped in the surfactant molecule layer to form bubbles. Since the surfactant reduces the surface tension of water, these bubbles can exist relatively stably.

[0025] Taking the total weight of the soil structure restoration agent as 100%, the soil structure restoration agent provided by the present invention includes 0.1-1wt% of a foam stabilizer, preferably 0.1-0.7wt%. In a specific embodiment of the present invention, the content of the foam stabilizer can be 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt% or 0.7wt%. In the present invention, the foam stabilizer includes one or more of nano-kaolin, nano-bentonite, nano-silica, nano-attapulgite and nano-montmorillonite, more preferably nano-silica. In the present invention, the particle size of the foam stabilizer is preferably 40-100nm, more preferably 50-80nm. In the present invention, taking nano kaolin as an example, the effects of the foam stabilizer include: (1) particle size and distribution: nano kaolin and the like have extremely small particle size and large specific surface area, which allows them to be evenly distributed in the liquid, thereby increasing the viscosity of the liquid and reducing the rate of bubble rupture; (2) enhancing foam stability: nano kaolin particles and the like form a network structure on the bubble surface or in the foam. The presence of these particles can increase the mechanical strength of the foam and prevent the merging and rupture of the bubbles; (3) improving the rheology of the liquid: the addition of nano kaolin and the like can improve the rheological properties of the liquid, making the liquid more viscous, thereby making the foam more stable and reducing the foam rupture caused by the fluidity of the liquid; (4) adsorption: nano kaolin particles and the like can be adsorbed on the gas-liquid interface of the foam, thereby increasing the interfacial tension of the foam and further stabilizing the foam structure.

[0026] Taking the total weight of the soil structure restoration agent as 100%, the soil structure restoration agent provided by the present invention includes 0.05-1% of the reinforcing agent, preferably 0.05-0.8wt%. In a specific embodiment of the present invention, the content of the reinforcing agent can be 0.05wt%, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt% or 0.7wt%. In the present invention, the reinforcing agent includes cellulose and / or cellulose derivatives. In the present invention, the cellulose derivative preferably includes methyl cellulose. In the present invention, the relative molecular weight of the cellulose is preferably 50000-300000, more preferably 100000-200000. In the present invention, the relative molecular weight of the methyl cellulose is preferably 50000-300000, more preferably 100000-200000. In the present invention, taking cellulose as an example, the effects of the enhancer include: (1) increasing the viscosity of the solution: cellulose is a high molecular polymer that can form a high viscosity solution in water. The high viscosity solution can slow down the flow rate of the liquid in the bubble film, thereby reducing the rupture and merging of the foam and improving the stability of the foam; (2) forming a network structure: cellulose molecular chains can form a three-dimensional network structure in the aqueous solution. This structure can effectively surround and support the bubbles, prevent the merging of bubbles and the discharge of liquid, thereby extending the life of the foam; (3) adsorption at the gas-liquid interface: cellulose molecules can be adsorbed on the gas-liquid interface of the bubbles to form a dense protective film. This layer of film can increase the elasticity and toughness of the bubble membrane and reduce the damage to the bubbles caused by external stress; (4) Prevent bubble merging: Cellulose can effectively prevent bubble merging by increasing the strength of the foam liquid membrane, that is, the membrane between the bubbles breaks and forms larger bubbles, thus maintaining the fineness and uniformity of the foam; (5) Improve the rheological properties of the foam: The presence of cellulose in the solution increases the yield stress and elastic modulus of the solution, which makes the foam show better elastic recovery under the action of external force, thereby resisting the collapse and deformation of the foam.

[0027] Taking the total weight of the soil structure restoration agent as 100%, the soil structure restoration agent provided by the present invention includes the balance of water.

[0028] The present invention provides a method for preparing the soil structure restoration agent described in the above technical solution, comprising the following steps:

[0029] The surfactant, the foam stabilizer, the enhancer and water are mixed to obtain the soil structure restoration agent.

[0030] Unless otherwise specified, the materials and equipment used in the present invention are all commercially available products in the art.

[0031] In the present invention, the mixing preferably comprises: dissolving a surfactant in water to obtain a surfactant solution; and sequentially adding a foam stabilizer and an enhancer to the surfactant solution to obtain a soil structure restoring agent.

[0032] The present invention provides the application of the soil structure restoration agent described in the above technical solution or the soil structure restoration agent prepared by the preparation method described in the above technical solution in the field of soil remediation.

[0033] In the present invention, the application preferably comprises the following steps:

[0034] Mixing the soil to be repaired, water, cement and a soil structure restoration agent to obtain a porous soil slurry; the soil structure restoration agent includes the soil structure restoration agent described in the above technical solution or the soil structure restoration agent prepared by the preparation method described in the above technical solution;

[0035] hardening the porous soil slurry to obtain a hardened soil raw material;

[0036] crushing the hardened soil raw material to obtain artificial soil particles;

[0037] The artificial soil particles are mixed with organic matter to obtain artificial planting soil.

[0038] The present invention preferably mixes the soil to be repaired, water, cement and a soil structure restoration agent to obtain porous soil slurry.

[0039] In the present invention, the soil to be remediated preferably includes one or more of sand washing tailings, riverbed mud, red mud and engineering slag. The present invention has no special requirements on the specific composition of the sand washing tailings, riverbed mud, red mud and engineering slag, and the sand washing tailings, riverbed mud, red mud and engineering slag well known in the art can be used.

[0040] In the present invention, the composition of the sand washing tailings preferably includes, in terms of mass percentage: 1. Silicon dioxide (SiO2): usually accounts for 60% to 90% of the sand washing tailings, and the specific content depends on the source of the sand and gravel; 2. Clay minerals: including kaolin, montmorillonite, etc., usually accounting for 5% to 20%; 3. Iron oxide (Fe2O3): generally between 1% and 10%, affecting color and properties; 4. Carbonate minerals (such as CaCO3, MgCO3): the content is usually between 1% and 5%.

[0041] In the present invention, the composition of the riverbed mud preferably includes, in terms of mass percentage: 1. Silicon dioxide (SiO2): usually accounts for 50% to 75% of the total composition, is the most important component in the riverbed mud, and comes from the weathering and erosion of sandstone and mineral particles; 2. Aluminum oxide (Al2O3): the content is generally between 10% and 20%, and aluminum minerals (such as kaolin) are more common in the mud; 3. Iron oxide (Fe2O3): usually accounts for 5% to 15%, and iron oxide has an important influence on the color and chemical properties of the mud; 4. Calcium oxide (CaO): the content is generally between 1% and 5%, and calcium minerals (such as calcite) may be more abundant in some rivers; 5. Magnesium oxide (MgO): usually accounts for 1% to 3%, and exists together with calcium oxide; 6. Organic matter: the content is generally between 2% and 10%.

[0042] In the present invention, the composition of the red mud preferably includes, in terms of mass percentage: 1. Alumina (Al2O3): usually accounts for 30% to 50% of the red mud composition, which is the main source of aluminum in bauxite; 2. Silicon dioxide (SiO2): the content is generally between 20% and 40%, mainly derived from silicon minerals in the ore; 3. Iron oxide (Fe2O3): usually accounts for 5% to 30%, and the presence of iron makes the red mud appear red or brown; 4. Calcium oxide (CaO): the content is generally between 1% and 5%, and calcium usually comes from carbonate minerals in bauxite; 5. Sodium oxide (Na2O): the content is generally between 1% and 4%, and the source of sodium is related to the characteristics of bauxite; 6. Magnesium oxide (MgO): the content is generally between 1% and 3%.

[0043] In the present invention, the composition of the engineering slag preferably includes: 1. Silicon dioxide (SiO2): usually the main component of engineering slag, the content is generally between 50% and 70%. It mainly comes from the weathering and crushing of sandstone and rock; 2. Aluminum oxide (Al2O3): the content is generally between 10% and 20%, and it comes from clay minerals and bauxite; 3. Iron oxide (Fe2O3): generally accounts for 5% to 15%, and iron oxide affects the color of the slag and its physical and chemical properties; 4. Calcium oxide (CaO): the content is usually between 1% and 5%, and it may come from the residues of building materials such as cement and lime; 5. Magnesium oxide (MgO): the content is generally between 1% and 3%, which is common in certain types of rocks and soils; 6. Sodium oxide (Na2O) and potassium oxide (K2O): the content of each is usually no more than 1% to 3%.

[0044] In the present invention, the type of cement preferably includes one or more of PO 32.5 and PO 42.5.

[0045] In the present invention, the mass of the soil to be repaired is based on dry weight, and the mass ratio of the cement to the soil to be repaired can be 1:4, 3:7, or 2:3.

[0046] In the present invention, the ratio of the mass of water (including the water in the soil to be repaired) to the total mass of cement and the soil to be repaired based on dry weight is preferably 0.4-0.6:1, more preferably 0.5-0.55:1.

[0047] In the present invention, the mass of the soil structure restoration agent is preferably 4 to 8% of the total mass of the dry weight of the soil to be repaired and the cement.

[0048] In the present invention, the mixing preferably includes: mixing the soil to be repaired, cement and water to obtain a mixed slurry; physically foaming the soil structure restoration agent to form prefabricated foam to obtain a foamed soil structure restoration liquid; mixing the foamed soil structure restoration liquid with the mixed slurry to obtain a porous soil slurry.

[0049] After obtaining the porous soil slurry, the present invention hardens the porous soil slurry to obtain hardened soil raw material. In the present invention, the hardening preferably includes pouring and curing performed in sequence.

[0050] After obtaining the hardened soil raw material, the present invention crushes the hardened soil raw material to obtain artificial soil particles. In the present invention, the particle size of the artificial soil particles is preferably 0.1-0.5 cm; the gradation of the artificial soil particles preferably includes: 25-30 wt% of the particles with a particle size of 0.4-0.5 cm, 35-40 wt% of the particles with a particle size of 0.2-0.4 cm, 20-30 wt% of the particles with a particle size of 0.1-0.2 cm, and 10-15 wt% of the particles with a particle size less than 0.1 cm.

[0051] After obtaining the artificial soil particles, the present invention mixes the artificial soil particles with organic matter to obtain artificial planting soil. In the present invention, before the artificial soil particles are mixed with the organic matter, it is preferred that the pH value of the artificial soil particles is adjusted to 7 to 8. In the present invention, the reagent used to adjust the pH value of the artificial soil particles to 7 to 8 is preferably a phosphoric acid solution, and the mass fraction of the phosphoric acid solution is preferably 1 to 10%, more preferably 5%.

[0052] In the present invention, the organic matter preferably includes one or more of animal fermented fertilizer and plant humus; the addition amount of the organic matter is preferably 10-30% of the dry weight of the artificial soil particles, and more preferably 20%. In the present invention, the functions of organic matter include: (1) improving fertility: organic matter contains rich nutrients, such as nitrogen, phosphorus, potassium, etc., which helps to improve soil fertility; (2) promoting microbial activity: organic matter provides a food source for microorganisms, promotes the reproduction and activity of soil microorganisms, and thus enhances the biological activity of the soil.

[0053] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] Example 1

[0055] Alkyl polyglycoside (APG) is dissolved in water and stirred with a glass rod until it is dissolved to prepare an alkyl polyglycoside (APG) solution with a concentration of 1.25wt‰ (solution 1); nano kaolin is dispersed in solution 1 and stirred with a glass rod until it is evenly dispersed, wherein the mass ratio of the nano kaolin to the alkyl polyglycoside (APG) is 1:1 (solution 2); methyl cellulose is added to solution 2, wherein the amount of methyl cellulose is 65wt% of the nano kaolin, and stirred with a glass rod until it is evenly dispersed, and the stirring speed is 20r / min, to obtain a soil structure restoration agent.

[0056] Weigh the required water with a water-to-solid mass ratio of 0.6, and inject it into the mixer; weigh the required construction waste soil (water content is 25wt%), and inject it into the mixer; stir at a speed of 50r / min, clockwise for 3min, and then counterclockwise for 3min; add the required cement into the mixer, stir at a speed of 50r / min, clockwise for 5min, and then counterclockwise for 5min, wherein the amount of cement is 30wt% of the solid dry material, and the solid dry material refers to the dry weight of cement and construction waste soil.

[0057] The soil structure restoration agent is injected into the above-mentioned mixer for stirring by using a foaming machine, the amount of the soil structure restoration agent is 6wt% of the solid dry material, wherein the power of the foaming machine is 800W, the speed of the mixer is 10r / min, and the stirring is clockwise for 1min and counterclockwise for 1min; after the soil is stirred evenly, it is poured into a fixed mold.

[0058] After the poured soil sample is cured in a natural environment for 7 days, it is crushed to a particle size of 0.1-0.5 cm, of which 30 wt% are particles of 0.4-0.5 cm, 40 wt% are particles of 0.2-0.4 cm, 20 wt% are particles of 0.1-0.2 cm, and 10 wt% are particles smaller than 0.1 cm, to obtain artificial soil particles.

[0059] The pH value of the crushed soil sample was adjusted to 7 with a phosphoric acid solution with a mass concentration of 5%, and the crushed soil sample was mixed with plant organic matter, wherein the organic matter content was 20wt% of the mass of the artificial soil particles, to obtain artificial planting soil.

[0060] Through the above process, the construction waste soil is adjusted to a state similar to the soil structure of natural planting soil. The artificial planting soil prepared in this embodiment has a water absorption rate of 75%, a 7-day water holding rate of 55% under natural conditions, a porosity of 35%, a 28-day strength (test standard is "Foamed Concrete" JG / T 266-2011) of 2.6 MPa, and a density of 930 kg / m 3 , which is beneficial to the growth of plant roots and the development of microbial colonies.

[0061] Example 2

[0062] The preparation of the soil structure restoring agent is the same as in Example 1.

[0063] Weigh the required water with a water-to-solid mass ratio of 0.6 and inject it into the mixer; weigh the required sand washing tailings (water content is 27wt%) and inject it into the mixer; stir at a speed of 50r / min, clockwise for 4min, and counterclockwise for 4min; add the required cement to the mixer, stir at a speed of 50r / min, clockwise for 5min, and counterclockwise for 5min, wherein the amount of cement is 30wt% of the solid dry material.

[0064] The soil structure restoration agent is injected into the above-mentioned mixer for stirring by using a foaming machine, the amount of the soil structure restoration agent is 6wt% of the solid dry material, wherein the power of the foaming machine is 800W, the speed of the mixer is 10r / min, and the stirring is clockwise for 1min and counterclockwise for 1min; after the soil is stirred evenly, it is poured into a fixed mold.

[0065] After the poured soil sample is cured in a natural environment for 7 days, it is crushed to a particle size of 0.1-0.5 cm, of which 30 wt% are particles of 0.4-0.5 cm, 40 wt% are particles of 0.2-0.4 cm, 20 wt% are particles of 0.1-0.2 cm, and 10 wt% are particles smaller than 0.1 cm, to obtain artificial soil particles.

[0066] The pH value of the crushed soil sample was adjusted to 7 with a phosphoric acid solution with a mass concentration of 5%, and the crushed soil sample was mixed with plant organic matter, wherein the organic matter content was 20wt% of the artificial soil particles, to obtain artificial planting soil.

[0067] Through the above process, the sand washing tailings is adjusted to a state similar to the soil structure of natural planting soil. The artificial planting soil prepared in this embodiment has a water absorption rate of 78%, a 7-day water holding rate of 62% under natural conditions, a porosity of 36%, a 28-day strength (test standard is "Foamed Concrete" JG / T 266-2011) of 2.4MPa, and a density of 905kg / m 3 , which is beneficial to the growth of plant roots and the development of microbial colonies.

[0068] Example 3

[0069] The preparation process of Example 3 is basically the same as that of Example 2, except that the soil structure restoration agent is adjusted. The preparation of the soil structure restoration agent is as follows:

[0070] The saponin solution is prepared by dissolving saponin in water and stirring it with a glass rod until it is dissolved, and the saponin solution with a concentration of 1.25wt‰ (solution 1); nano-kaolin is dispersed in solution 1 and stirred with a glass rod until it is evenly dispersed, and the mass ratio of the nano-kaolin to the saponin is 1:1 (solution 2); methyl cellulose is added to solution 2, wherein the amount of methyl cellulose is 80wt% of the nano-kaolin, and the solution is stirred with a glass rod until it is evenly dispersed, and the stirring speed is 20r / min, to obtain a soil structure restoration agent.

[0071] The other preparation processes are the same as those in Example 2.

[0072] Through the above process, the sand washing tailings is adjusted to a state similar to the soil structure of natural planting soil. The artificial planting soil prepared in this embodiment has a water absorption rate of 76%, a 7-day water holding rate of 63% under natural conditions, a porosity of 38%, a 28-day strength (test standard is "Foamed Concrete" JG / T 266-2011) of 2.2MPa, and a density of 870kg / m 3 , which is beneficial to the growth of plant roots and the development of microbial colonies.

[0073] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A soil structure restoration agent, characterized in that: Taking the total weight of the soil structure restoration agent as 100%, the soil structure restoration agent comprises the following components in percentage by weight: 0.1-1 wt% surfactant, 0.1-1 wt% foam stabilizer, 0.05-1 wt% enhancer, and the balance water; The foam stabilizer comprises one or more of nano kaolin, nano bentonite, nano silicon dioxide, nano attapulgite and nano montmorillonite; The reinforcing agent includes cellulose and / or cellulose derivatives.

2. The soil structure restoration agent according to claim 1, characterized in that: The surfactant includes one or more of alkyl glycosides, saponins, fatty alcohol polyoxyethylene ethers, α-olefin sulfonates, fatty alcohol polyoxyethylene ether sulfates, fatty alcohol polyoxyethylene ether carboxylates, soapberry saponins, betulin, lupeol, γ-sitosterol, betaine, coconut oil amide acetate, palmitamidopropyl ethylenediamine and oenotheramide.

3. The soil structure restoration agent according to claim 1 or 2, characterized in that: The content of the surfactant is 0.1-0.7 wt %.

4. The soil structure restoration agent according to claim 1, characterized in that: The particle size of the foam stabilizer is 40 to 100 nm.

5. The soil structure restoration agent according to claim 1 or 4, characterized in that: The content of the foam stabilizer is 0.1-0.7 wt %.

6. The soil structure restoration agent according to claim 1, characterized in that: The cellulose derivatives include methyl cellulose.

7. The soil structure restoration agent according to claim 1 or 6, characterized in that: The content of the reinforcing agent is 0.05-0.8 wt %.

8. The method for preparing the soil structure restoration agent according to any one of claims 1 to 7, comprising the following steps: The surfactant, the foam stabilizer, the enhancer and water are mixed to obtain the soil structure restoration agent.

9. The preparation method according to claim 8, characterized in that: The mixing comprises: dissolving a surfactant in water to obtain a surfactant solution; and sequentially adding a foam stabilizer and an enhancer into the surfactant solution to obtain the soil structure restoration agent.

10. Use of the soil structure restoration agent according to any one of claims 1 to 7 or the soil structure restoration agent prepared by the preparation method according to any one of claims 8 to 9 in the field of soil remediation.

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