Multifunctional wind-prevention and sand-fixation agent for salinization area, preparation method and use method of multifunctional wind-prevention and sand-fixation agent

Abstract

The invention belongs to the technical field of chemical sand fixation materials, and particularly relates to a multifunctional windproof sand fixation agent for a salinized area and a preparation method of the multifunctional windproof sand fixation agent. The wind prevention and sand fixation agent is prepared from water absorption and water retention resin, modified cellulose, electrolytic aluminum slag, bentonite, black humic acid, carbide slag, activated sludge, biogas residues, biogas slurry and organic fertilizer. The wind prevention and sand fixation agent is a multifunctional and multi-effect sand fixation material with the functions of sand fixation, wind erosion resistance, water retention, heat preservation, salinized soil improvement, ecological restoration and the like. The sand solidification agent is mainly prepared from natural raw materials, has the advantages of being environmentally friendly and free of secondary pollution, is a wind prevention and sand solidification material with excellent performance, and provides an effective industrial solution for ecological restoration of salinized and arid areas.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical sand-fixing materials, and particularly relates to a multifunctional windproof and sand-fixing agent for saline areas, a preparation method and a usage method. Background Art

[0002] Traditional chemical sand-fixing agents mainly rely on non-renewable petroleum-based raw materials, with high energy consumption in the synthesis process and possible secondary pollution caused by degradation products.

[0003] Although starch-based and cellulose-based bio-based degradable materials have emerged in recent years, their weather resistance is insufficient, and they are prone to structural pulverization in arid and high-temperature environments, making it difficult to meet the long-term sand-fixing requirements. In addition, the special environment of saline areas poses higher requirements for sand-fixing agents. The high ion concentration (Na⁺, Cl⁻) in saline soil makes it difficult for ordinary sand-fixing agents to form a stable crust, and most sand-fixing agents only focus on the physical sand-fixing effect and lack in-depth regulation of the soil microecology. Facing the above challenges, developing a multifunctional sand-fixing material that integrates efficient sand-fixing, saline-alkali improvement and ecological restoration has become an urgent need in the field of desertification control.

[0004] Patent Application No. CN110878212A: Invention Name is "A Degradable Desert Sand-Fixing Agent", Chinese Patent Application No. CN113337288A: Invention Name is "Preparation and Application Method of a Plant-Based Sand-Fixing Agent", Chinese Patent Application No. CN114989833A: Invention Name is "An Environmentally Friendly Functional Sand-Fixing Agent and Sand-Fixing Method", Chinese Patent Application No. CN116987507A: Invention Name is "A Sand-Fixing Agent and an Efficient Sand-Fixing Method Based on High-Temperature Desert Areas", Chinese Patent Application No. CN117778019A: Invention Name is "A Straw Particle Pulp Windproof and Sand-Fixing Agent and Its Application", Chinese Patent Application No. CN118667092A: Invention Name is "A Water-Retaining Sand-Fixing Agent and Its Preparation Method", Chinese Patent Application No. CN119351112A: Invention Name is "A Composite Sand-Fixing Agent and Its Preparation Method" all disclose a sand-fixing agent.

[0005] Although the above-mentioned publicly disclosed patents have made progress in the development of bio-based materials and the adaptability to special environments, they still generally have problems such as insufficient structural stability in extreme environments and poor compatibility between degradation products and soil microecology. Especially for saline areas, the existing technology has not yet broken through the bottleneck of the coordinated optimization of environmental protection, anti-salt stability, waste residue resource utilization and ecological functions. Therefore, developing a multifunctional sand-fixing material with efficient sand-fixing, saline-alkali improvement and ecological restoration has become an urgent need in desertification control. Summary of the Invention

[0006] Based on the above technical background, the main object of the present invention is to provide a multifunctional windbreak and sand fixation agent for salinized areas, a preparation method and a usage method, so as to overcome the deficiencies in the prior art.

[0007] To achieve the foregoing invention object, the technical solutions adopted by the present invention include: In the first aspect of the present invention, there is provided a multifunctional windbreak and sand fixation agent for salinized areas, and the windbreak and sand fixation agent is prepared from the following raw materials in parts by weight: 0.5 - 1 part by weight of water-absorbing and water-retaining resin, 2 - 6 parts by weight of modified cellulose, 5 - 10 parts by weight of electrolytic aluminum slag, 10 - 20 parts by weight of bentonite, 15 - 25 parts by weight of black humic acid, 15 - 25 parts by weight of carbide slag, 15 - 25 parts by weight of activated sludge, 5 - 10 parts by weight of biogas residue, 10 - 20 parts by weight of biogas slurry, and 10 - 20 parts by weight of organic fertilizer.

[0008] Preferably, the windbreak and sand fixation agent is prepared from the following raw materials in parts by weight: 0.8 part by weight of water-absorbing and water-retaining resin, 4 parts by weight of modified cellulose, 8 parts by weight of electrolytic aluminum slag, 15 parts by weight of bentonite, 20 parts by weight of black humic acid, 20 parts by weight of carbide slag, 20 parts by weight of activated sludge, 8 parts by weight of biogas residue, 15 parts by weight of biogas slurry, and 15 parts by weight of organic fertilizer.

[0009] Preferably, the modified cellulose is selected from one or more of carboxymethyl cellulose, sodium carboxymethyl cellulose, hydroxyethyl cellulose, and straw cellulose derivatives.

[0010] In the second aspect of the present invention, there is provided a method for preparing the multifunctional windbreak and sand fixation agent for salinized areas described in the first aspect of the present invention, and the method includes the following steps: Mix the water-absorbing and water-retaining resin, modified cellulose, electrolytic aluminum slag, bentonite, black humic acid, carbide slag, activated sludge, biogas residue, biogas slurry, and organic fertilizer evenly at a stirring speed of 150 - 300 rpm to obtain the windbreak and sand fixation agent.

[0011] Preferably, the preparation method of the water-absorbing and water-retaining resin includes the following steps: Step 1: Under the condition of nitrogen protection, mix carboxymethyl cellulose and water, heat up and stir to obtain a clear solution; Step 2: Add an aqueous solution of persulfate to the clear solution, stir evenly, then add the water-absorbing and water-retaining resin monomer and black humic acid, stir and dissolve, continue to heat up, carry out the reaction under stirring conditions, and then wash and dry to obtain the water-absorbing and water-retaining resin.

[0012] In Step 1, Preferably, the mass ratio of the carboxymethyl cellulose to the water is (5 - 20):(450 - 600); Preferably, heat up to 55 - 65°C and stir to dissolve into a clear solution under the stirring condition of 150 - 300 rpm.

[0013] In Step 2, Preferably, purge with nitrogen for more than 30 min, add an aqueous solution of persulfate with a mass fraction of 2 - 5% to the clear solution, and the mass ratio of the aqueous persulfate solution to carboxymethyl cellulose is 75:(5 - 20). Keep the temperature at 55 - 65°C and continue stirring for 10 - 30 min.

[0014] Preferably, the mass ratio of the water-absorbing and water-retaining resin monomer, black humic acid, and aqueous persulfate solution is (75 - 125):(15 - 25):75; Preferably, under the condition of 55 - 65°C, add the water-absorbing and water-retaining resin monomer and black humic acid, continue stirring for 0.5 - 1 h, then continue to heat up to 65 - 75°C and react under stirring for 3 - 4 h.

[0015] Preferably, the drying condition is: drying at 50 - 70°C for 4 - 8 h.

[0016] The third aspect of the present invention lies in providing a method for using the multifunctional windbreak and sand fixation agent for salinized areas described in the first aspect of the present invention. The method includes the following steps: Rototill and mix the windbreak and sand fixation agent with sand having a thickness of 5 - 30 cm. The dosage ratio of the windbreak and sand fixation agent to the area of the sand is (100 - 600) g:1 m 2 .

[0017] The beneficial effects of the present invention: (1) The multifunctional windbreak and sand fixation agent described in the present invention has strong sand fixation, crust compression resistance, and wind erosion resistance, and can quickly form a stable sand layer crust on the sand surface to achieve the purpose of quickly preventing wind and fixing sand. At the same time, the windbreak and sand fixation agent described in the present invention also has good water retention and water absorption properties, and has multiple functions such as water retention and heat preservation, reducing soil salinization, and providing nutritional conditions for windbreak and sand fixation plants. In addition, the sand fixation agent mainly uses natural raw materials, has the advantages of being green and environmentally friendly, and does not produce secondary pollution, and is an excellent windbreak and sand fixation material with excellent performance.

[0018] (2) The black humic acid and water-absorbing and water-retaining resin (copolymer modified resin) used in the windbreak and sand fixation agent of the present invention can form a double network structure to extend the water retention period. The layered structure of bentonite has the function of locking water and preventing the resin network from dehydrating and embrittling at high temperatures. Ca in carbide slag 2+ can replace Na in the soil + , and combined with the ion exchange function of bentonite, it can break through the problem of the failure of water retention materials in high-salt environments and is applicable to salinized areas.

[0019] The electrolytic aluminum slag and carbide slag added in the present invention can generate ettringite, and the modified cellulose can provide flexible bonding, enabling the windbreak and sand fixation agent to form a "rigid-flexible" composite structure, thereby improving the structural stability of the sand fixation material and enhancing its wind erosion resistance.

[0020] The activated sludge and biogas residues in the windbreak and sand fixation agent construct a self-sustaining microbial community, which can achieve synchronous and efficient treatment of sand fixation, water conservation, soil improvement, and ecological restoration.

[0021] The organic fertilizer added in the present invention can increase the organic matter content in the sandy land and directly promote plant growth. The organic fertilizer, biogas residues, biogas slurry, activated sludge, black humic acid, and water-absorbing and water-retaining resin in the windbreak and sand fixation agent have a synergistic effect, which can form a "dual slow-release of water and nutrients" system, extend the water and nutrient supply cycle of plants, and enhance the long-term fertility of the sandy land.

[0022] (3) The wastes generated by electrolytic aluminum plants, sewage treatment plants, and farms, such as electrolytic aluminum slag, carbide slag, biogas residues, biogas slurry, activated sludge, etc., can be directly used in the production of the sand fixation agent of the present invention, which can not only reduce the preparation cost of the sand fixation agent, but also promote the regional circular economy model of "treating waste with waste" and promote the large-scale application of industrial and agricultural wastes in ecological governance.

[0023] (4) The windbreak and sand fixation agent described in the present invention has excellent performance and a simple preparation method. It can be obtained only by simple stirring and mixing, and its use method is also simple, which can provide an effective industrial solution for the ecological restoration of salinized and arid regions. Description of the Drawings

[0024] Figure 1 Showing the scanning electron microscope photograph of the sand fixation agent prepared in Example 1; Figure 2 Showing the energy spectrum analysis of the scanning electron microscope of the sand fixation agent prepared in Example 1; Figure 3 Showing the influence of the content of the sand fixation agent prepared in Example 1 on the water absorption rate of distilled water and sodium chloride solution (0.9 wt%); Figure 4 Showing the water retention relationship between the content of the sand fixation agent prepared in Example 1 and the sand sample model; Figure 5 Showing the relationship between the content of the sand fixation agent prepared in Example 1 and the strength of the consolidation layer. Detailed Embodiments

[0025] The present invention will be described in detail below, and the features and advantages of the present invention will become clearer and more definite with these descriptions.

[0026] The first aspect of the present invention is to provide a multifunctional windbreak and sand fixation agent for salinized areas. The windbreak and sand fixation agent is prepared from the following raw materials in parts by weight: 0.5 - 1 part of water-absorbing and water-retaining resin, 2 - 6 parts of modified cellulose, 5 - 10 parts of electrolytic aluminum slag, 10 - 20 parts of bentonite, 15 - 25 parts of black humic acid, 15 - 25 parts of carbide slag, 15 - 25 parts of activated sludge, 5 - 10 parts of biogas residue, 10 - 20 parts of biogas slurry, and 10 - 20 parts of organic fertilizer.

[0027] Preferably, the windbreak and sand fixation agent is prepared from the following raw materials in parts by weight: 0.8 part of water-absorbing and water-retaining resin, 4 parts of modified cellulose, 8 parts of electrolytic aluminum slag, 15 parts of bentonite, 20 parts of black humic acid, 20 parts of carbide slag, 20 parts of activated sludge, 8 parts of biogas residue, 15 parts of biogas slurry, and 15 parts of organic fertilizer.

[0028] The modified cellulose is selected from one or more of carboxymethyl cellulose, sodium carboxymethyl cellulose, hydroxyethyl cellulose, and straw cellulose derivatives.

[0029] Preferably, the modified cellulose is hydroxyethyl cellulose.

[0030] The bentonite used in the present invention is a natural clay mineral product.

[0031] The biogas slurry and biogas residue are by-products of the biogas project attached to large-scale cattle farms. The present invention resourcefully utilizes solid and liquid waste generated in industrial and agricultural production, including electrolytic aluminum slag, carbide slag, etc., which not only reduces the preparation cost of the windbreak and sand fixation agent but also improves the utilization rate of solid and liquid waste generated in industrial and agricultural production.

[0032] The added modified cellulose in the present invention forms a viscous colloid through the hydroxyl groups and ether bonds on the molecular chain, which can effectively bond sand grains and construct stable aggregates, reducing soil wind erosion. The aluminum ions in the electrolytic aluminum slag crosslink with the cellulose molecules, enhancing the mechanical strength of the colloid. At the same time, the reaction between aluminum oxide and silicate in the aluminum slag and calcium hydroxide in the carbide slag can form a stable crust (such as ettringite), which, together with the layered structure of bentonite, jointly constructs the sandy soil skeleton, solidifies sand grains, and enhances their wind erosion resistance.

[0033] The added water-absorbing and water-retaining resin in the present invention combines with the hydrophilic groups of black humic acid to form a double-layer water-absorbing structure, and a large amount of water is locked through the polymer network structure of the water-absorbing and water-retaining resin, which can be slowly released during drought to maintain the humidity of the sandy soil surface. After absorbing water and swelling, bentonite fills the voids between sand grains, forming a dense structure, which can effectively reduce water evaporation. The present invention maintains the humidity of the sandy soil surface through the dual optimization of water absorption and water retention, promoting seed germination and plant growth.

[0034] The calcium ions in the carbide slag added in the present invention can displace the sodium ions (Na + ), reducing the degree of soil salinization. The black humic acid can chelate Na + , Cl - and neutralize the alkalinity of the carbide slag, reducing the pH of the saline soil and improving the soil aggregate structure. The microorganisms in the activated sludge will decompose the organic matter to generate organic acids, promoting the dissolution and infiltration of salts. The bentonite can exchange and adsorb Na + through the interlayer cations, releasing Ca 2+ , Mg 2+ , thereby improving the soil permeability.

[0035] The organic fertilizer added in the present invention will provide nitrogen, phosphorus, potassium and trace elements to increase the organic matter content in the sandy land, directly promoting plant growth. The biogas residue provides a carbon source, a nitrogen source and beneficial microorganisms (such as nitrogen-fixing bacteria and phosphorus-solubilizing bacteria), promoting the ecological restoration of the sandy land. The biogas slurry supplements the liquid nutrients and improves the microenvironment of the sandy land surface. The black humic acid combines with the interlayer cations of the bentonite through carboxyl groups, forming an organic-inorganic complex, which can be used as a carrier of organic matter, promoting the slow release of nutrients and improving the fertilizer utilization rate. The microorganisms in the activated sludge decompose the lignocellulose in the biogas residue, releasing small-molecule organic substances, which can accelerate the accumulation of organic matter in the sandy land and promote the establishment of the sandy land microbial community. The organic fertilizer, biogas residue, biogas slurry, activated sludge, black humic acid and water-absorbing and water-retaining resin in the windbreak and sand fixation agent have a synergistic effect, forming a "dual slow release of water and nutrients" system, which can extend the water and nutrient supply cycle of plants and enhance the long-term fertility of the sandy land.

[0036] The second aspect of the present invention lies in providing a method for preparing the multifunctional windbreak and sand fixation agent for salinized areas described in the first aspect of the present invention, and the method includes the following steps: Mix the water-absorbing and water-retaining resin, modified cellulose, electrolytic aluminum slag, bentonite, black humic acid, carbide slag, activated sludge, biogas residue, biogas slurry and organic fertilizer evenly at a stirring speed of 150 - 300 rpm to obtain the windbreak and sand fixation agent.

[0037] The stirring speed of 150 - 300 rpm can enable the inorganic materials such as electrolytic aluminum slag and bentonite to be fully combined with the organic components (activated sludge, biogas slurry), forming a "dual slow release of water and nutrients" system.

[0038] Preferably, mix the water-absorbing and water-retaining resin, modified cellulose, electrolytic aluminum slag, bentonite, black humic acid, carbide slag, activated sludge, biogas residue, biogas slurry and organic fertilizer evenly at a stirring speed of 200 rpm to obtain the windbreak and sand fixation agent.

[0039] According to the preferred embodiment of the present invention, the preparation method of the water-absorbing and water-retaining resin includes the following steps: Step 1: Under the condition of nitrogen protection, mix carboxymethyl cellulose and water, heat up and stir to obtain a clear solution; Step 2: Add an aqueous solution of persulfate to the clear solution, stir evenly, then add a water-absorbing and water-retaining resin monomer and humic acid, stir and dissolve, continue to heat up, carry out the reaction under stirring conditions, and then wash and dry to obtain a water-absorbing and water-retaining resin.

[0040] The above steps are specifically described below.

[0041] In Step 1, the mass ratio of the carboxymethyl cellulose to water is (5 - 20):(450 - 600).

[0042] Preferably, the mass ratio of the carboxymethyl cellulose to water is 12:500.

[0043] Heat up to 55 - 65 °C and stir and dissolve into a clear solution under the stirring condition of 150 - 300 rpm.

[0044] Preferably, heat up to 60 °C and stir and dissolve into a clear solution under the stirring condition of 200 rpm.

[0045] As a dispersion medium and support structure of the reaction system, carboxymethyl cellulose first dissolves in an alkaline aqueous solution under nitrogen protection to form a uniform and viscous colloid, which not only provides a stable dispersion environment for the subsequent polymerization reaction, but also can physically entangle or chemically crosslink with the polymerization monomer through the hydroxyl groups on its molecular chain, thereby enhancing the mechanical strength and swelling stability of the water-absorbing and water-retaining resin.

[0046] In Step 2, keep nitrogen passing for more than 30 min, add an aqueous solution of persulfate with a mass fraction of 2 - 5% to the clear solution, the mass ratio of the aqueous solution of persulfate to carboxymethyl cellulose is 75:(5 - 20), keep the temperature at 55 - 65 °C, and continue to stir for 10 - 30 min.

[0047] Preferably, keep nitrogen passing for 30 min, add an aqueous solution of persulfate with a mass fraction of 3% to the clear solution, the mass ratio of the aqueous solution of persulfate to carboxymethyl cellulose is 75:12, keep the temperature at 60 °C, and continue to stir for 20 min.

[0048] The persulfate added in the present invention can initiate a free radical polymerization reaction to form a cross-linked polymer network structure. The polymerization monomer endows the resin with strong hydrophilicity and high resin network elasticity, thereby improving its anti-dehydration ability in a saline environment.

[0049] The water-absorbing and water-retaining resin monomer is selected from one or more of sodium acrylate, acrylamide, sodium alginate, and sodium carboxymethyl cellulose.

[0050] Preferably, the water-absorbing and water-retaining resin monomer is sodium acrylate.

[0051] The mass ratio of the water-absorbing and water-retaining resin monomer, black humic acid, and aqueous persulfate solution is (75-125):(15-25):75.

[0052] Preferably, the mass ratio of the water-absorbing and water-retaining resin monomer, black humic acid, and aqueous persulfate solution is 80:20:75.

[0053] Active groups such as carboxyl groups and phenolic hydroxyl groups in black humic acid participate in free radical polymerization as comonomers, embedding black humic acid molecules into the resin network, thereby significantly improving the salt tolerance stability of the water-absorbing and water-retaining resin material.

[0054] Under the condition of 55-65°C, add the water-absorbing and water-retaining resin monomer and black humic acid, continue stirring for 0.5-1 h until completely dissolved, then continue heating to 65-75°C, and react for 3-4 h under stirring conditions.

[0055] Preferably, under the condition of 60°C, add the water-absorbing and water-retaining resin monomer and black humic acid, continue stirring for 0.5 h until completely dissolved, then continue heating to 70°C, and react for 3.5 h under stirring conditions.

[0056] The washing is preferably carried out by washing with water 3-5 times, and more preferably by washing with water 2 times.

[0057] The drying conditions are: drying at 50-70°C for 4-8 h.

[0058] Preferably, the drying conditions are: drying at 70°C for 8 h.

[0059] The third aspect of the present invention lies in providing a method for using the multifunctional windbreak and sand fixation agent for salinized areas described in the first aspect of the present invention, and the method for using includes the following steps: Rotary till and mix the windbreak and sand fixation agent with 5-30 cm thick sand, and the dosage ratio of the windbreak and sand fixation agent to the area of the sand is (100-600) g:1 m 2 .

[0060] Preferably, rotary till and mix the windbreak and sand fixation agent with 5 cm thick sand, and the dosage ratio of the windbreak and sand fixation agent to the area of the sand is 100 g:1 m 2 .

[0061] Example The present invention is further described below through specific examples. These examples are only for illustrating the present invention and are not used to limit the scope of the present invention. The raw materials used in the examples of the present invention are all commercially available.

[0062] Example 1 12 parts by weight of carboxymethyl cellulose and 500 parts by weight of distilled water were added to a nitrogen-protected reactor, heated to 60°C, and stirred at a speed of 200 rpm to dissolve into a clear solution; the nitrogen was kept flowing for 30 minutes, and then 75 parts by weight of a 3% persulfate aqueous solution (sodium persulfate aqueous solution) was added, the temperature was kept at 60°C, and stirring was continued for 20 minutes; then 80 parts by weight of sodium acrylate and 20 parts by weight of black humic acid were added, and stirring was continued for 0.5 hours to completely dissolve; the mixture was continued to be heated to 70°C, stirred for 3.5 hours to complete the reaction, washed with distilled water three times, and finally dried at 70°C for 8 hours to obtain a water-absorbing and water-retaining resin.

[0063] 0.8 parts by weight of water-absorbing and water-retaining resin, 4 parts by weight of hydroxyethyl cellulose, 8 parts by weight of electrolytic aluminum slag, 15 parts by weight of bentonite, 20 parts by weight of black humic acid, 20 parts by weight of carbide slag, 20 parts by weight of activated sludge, 8 parts by weight of biogas residue, 15 parts by weight of biogas liquid and 15 parts by weight of organic fertilizer were mixed and stirred at a stirring speed of 200 rpm to obtain a windbreak and sand-fixing agent. The windbreak and sand-fixing agent was rotary tilled and mixed with 5 cm thick sand. The amount of windbreak and sand-fixing agent to be treated was 100 g by mass to 1 m 2 .

[0064] Example 2 5 parts by weight of carboxymethyl cellulose and 450 parts by weight of distilled water were added to a nitrogen-protected reactor, heated to 60°C, and stirred at 300 rpm to dissolve into a clear solution; nitrogen was maintained for 40 minutes, and then 75 parts by weight of a 5% persulfate aqueous solution (potassium persulfate aqueous solution) was added, the temperature was maintained at 60°C, and stirring was continued for 30 minutes; then 125 parts by weight of sodium alginate and 25 parts by weight of black humic acid were added, and stirring was continued for 1 hour to completely dissolve; heating was continued to 75°C, stirring was continued for 4 hours to complete the reaction, and the mixture was washed with distilled water 5 times. Finally, it was dried at 65°C for 7 hours to obtain a water-absorbing and water-retaining resin.

[0065] 0.5 parts by weight of water-absorbing and water-retaining resin, 6 parts by weight of carboxymethyl cellulose, 10 parts by weight of electrolytic aluminum slag, 20 parts by weight of bentonite, 25 parts by weight of black humic acid, 25 parts by weight of calcium carbide slag, 25 parts by weight of activated sludge, 10 parts by weight of biogas residue, 10 parts by weight of biogas liquid and 20 parts by weight of organic fertilizer were mixed and stirred at a stirring speed of 150 rpm to obtain a windbreak and sand-fixing agent. The windbreak and sand-fixing agent was rotary tilled and mixed with 30 cm thick sand. The amount of windbreak and sand-fixing agent to be treated was 500 g by mass to 1 m 2 .

[0066] Example 3 Add 20 parts by weight of carboxymethyl cellulose and 600 parts by weight of distilled water into a reaction kettle under nitrogen protection, heat to 60 °C, and stir and dissolve into a clear solution at a rotation speed of 150 rpm; keep nitrogen passing for 30 min, then add 75 parts by weight of an aqueous solution of persulfate (potassium persulfate aqueous solution) with a mass fraction of 2%, keep the temperature at 60 °C, and continue to stir for 10 min; then add 75 parts by weight of sodium acrylate, 15 parts by weight of acrylamide and 15 parts by weight of black humic acid, and continue to stir for 0.5 h until completely dissolved; continue to heat to 65 °C, stir for 3 h to complete the reaction, wash 3 times with distilled water, and finally dry at 50 °C for 5 h to obtain a water-absorbing and water-retaining resin.

[0067] Mix 1 part by weight of the water-absorbing and water-retaining resin, 2 parts by weight of straw cellulose derivative, 5 parts by weight of electrolytic aluminum slag, 10 parts by weight of bentonite, 15 parts by weight of black humic acid, 15 parts by weight of carbide slag, 15 parts by weight of activated sludge, 5 parts by weight of biogas residue, 10 parts by weight of biogas slurry and 10 parts by weight of organic fertilizer, and stir evenly at a stirring speed of 250 rpm to obtain a windbreak and sand fixation agent. Mix the windbreak and sand fixation agent with 20 cm thick sand by rotary tillage. The dosage ratio of the windbreak and sand fixation agent to the sand to be treated is 300 g∶1 m 2 。 Example 4 Add 15 parts by weight of carboxymethyl cellulose and 550 parts by weight of distilled water into a reaction kettle under nitrogen protection, heat to 60 °C, and stir and dissolve into a clear solution at a rotation speed of 250 rpm; keep nitrogen passing for 35 min, then add 75 parts by weight of an aqueous solution of persulfate (sodium persulfate aqueous solution) with a mass fraction of 4%, keep the temperature at 60 °C, and continue to stir for 25 min; then add 90 parts by weight of acrylamide and 22 parts by weight of black humic acid, and continue to stir for 0.8 h until completely dissolved; continue to heat to 73 °C, stir for 3.5 h to complete the reaction, wash 4 times with distilled water, and finally dry at 55 °C for 6 h to obtain a water-absorbing and water-retaining resin.

[0068] Mix 0.7 part by weight of the water-absorbing and water-retaining resin, 5 parts by weight of carboxymethyl cellulose, 7 parts by weight of electrolytic aluminum slag, 18 parts by weight of bentonite, 22 parts by weight of black humic acid, 18 parts by weight of carbide slag, 22 parts by weight of activated sludge, 7 parts by weight of biogas residue, 18 parts by weight of biogas slurry and 18 parts by weight of organic fertilizer, and stir evenly at a stirring speed of 300 rpm to obtain a windbreak and sand fixation agent. Mix the windbreak and sand fixation agent with 15 cm thick sand by rotary tillage. The dosage ratio of the windbreak and sand fixation agent to the sand to be treated is 400 g∶1 m 2 。 Example 5 Add 8 parts by weight of carboxymethyl cellulose and 580 parts by weight of distilled water into a reaction kettle protected by nitrogen, heat to 60 °C, and stir and dissolve into a clear solution under the condition of a rotation speed of 280 rpm; keep nitrogen passing for 45 min, then add 75 parts by weight of an aqueous solution of persulfate (sodium persulfate aqueous solution) with a mass fraction of 4.5%, keep the temperature at 60 °C, and continue to stir for 25 min; then add 90 parts by weight of sodium carboxymethyl cellulose and 18 parts by weight of black humic acid, and continue to stir for 1 h until completely dissolved; continue to heat to 68 °C, stir for 3.5 h to complete the reaction, wash 5 times with distilled water, and finally dry at 65 °C for 6 h to obtain a water-absorbing and water-retaining resin.

[0069] Mix 0.9 part by weight of the water-absorbing and water-retaining resin, 3 parts by weight of hydroxyethyl cellulose, 9 parts by weight of electrolytic aluminum slag, 12 parts by weight of bentonite, 18 parts by weight of black humic acid, 22 parts by weight of carbide slag, 18 parts by weight of activated sludge, 9 parts by weight of biogas residue, 12 parts by weight of biogas slurry and 12 parts by weight of organic fertilizer, and stir evenly at a stirring speed of 200 rpm to obtain a windbreak and sand fixation agent. Mix the windbreak and sand fixation agent with 25 cm thick sand by rotary tillage. The dosage ratio of the windbreak and sand fixation agent to the sand to be treated is 550 g∶1 m 2 。 Experimental Example Experimental Example 1 Scanning Electron Microscope and Energy Spectrum Analysis Test Carry out scanning electron microscope test and energy spectrum analysis test on the windbreak and sand fixation agent prepared in Example 1. The results of the scanning electron microscope test are as Figure 1 shown, and the results of the energy spectrum analysis are as Figure 2 shown.

[0070] From Figure 1 it can be seen that the surface of the windbreak and sand fixation agent prepared by the present invention has tiny pores. From Figure 2 it can be seen that the windbreak and sand fixation agent prepared by the present invention has elements of K, O, N, P, and Ca, and the distribution of each element is very uniform.

[0071] Experimental Example 2 Water Absorption Rate Test Test the water absorption rates of the windbreak and sand fixation agent prepared in Example 1 for distilled water and sodium chloride solution (0.9 wt%) respectively. The test results are as Figure 3 shown.

[0072] From Figure 3It can be seen that as the content of the sand-fixing agent increases, the water absorption rates of both distilled water and sodium chloride solution first increase and then decrease. When the content of the sand-fixing agent is about 11wt%, the water absorption rates of distilled water and sodium chloride solution reach their peaks. The maximum water absorption of distilled water is 350g / g, and the maximum water absorption of sodium chloride solution is 40g / g. This shows that the sand-fixing and windproof agent described in the present invention exhibits good water absorption for distilled water and sodium chloride solution.

[0073] Experimental Example 3 Water Retention Test The water retention test was carried out on the sand-fixing agents prepared in Example 1 with different contents, and the test results are as Figure 4 shown.

[0074] From Figure 4 it can be seen that as the content of the sand-fixing agent increases, its water retention rate continuously increases, and as time increases, the water retention rate of the sand-fixing agent gradually decreases. When the content of the sand-fixing agent is 0.06%, the water retention rate of the sand-fixing agent is the highest, and the water retention rate can still reach about 5% after 2.5h. This shows that the sand-fixing agent described in the present invention has good water retention.

[0075] Experimental Example 4 Consolidated Layer Strength Test The consolidated layer strength test was carried out on the sand-fixing agents prepared in Example 1 with different contents, and the test results are as Figure 5 shown.

[0076] Figure 5 In it, as the content of the sand-fixing agent increases, the strength of its consolidated layer gradually increases. When the content of the sand-fixing agent is 0.05%, the strength of its consolidated layer can reach 2.5MPa. This shows that the sand-fixing agent described in the present invention can quickly form a stable sand crust on the sand surface, and the crust has high strength and strong sand-fixing and crust compression resistance performance.

[0077] The present invention has been described in detail above in combination with specific embodiments and exemplary examples, but these descriptions should not be construed as limiting the present invention. Those skilled in the art understand that without departing from the spirit and scope of the present invention, various equivalent substitutions, modifications or improvements can be made to the technical solutions and their implementation manners of the present invention, and these all fall within the scope of the present invention. The protection scope of the present invention is subject to the appended claims.

Claims

1. A multifunctional windbreak and sand fixation agent for salinized areas, characterized in that, The windbreak and sand fixation agent is prepared from the following raw materials in parts by weight: 0.5 - 1 part by weight of water-absorbing and water-retaining resin, 2 - 6 parts by weight of modified cellulose, 5 - 10 parts by weight of electrolytic aluminum slag, 10 - 20 parts by weight of bentonite, 15 - 25 parts by weight of black humic acid, 15 - 25 parts by weight of carbide slag, 15 - 25 parts by weight of activated sludge, 5 - 10 parts by weight of biogas residue, 10 - 20 parts by weight of biogas slurry, and 10 - 20 parts by weight of organic fertilizer.

2. The multifunctional windbreak and sand fixation agent for salinized areas according to claim 1, wherein The windbreak and sand fixation agent is prepared from the following raw materials in parts by weight: 0.8 part by weight of water-absorbing and water-retaining resin, 4 parts by weight of modified cellulose, 8 parts by weight of electrolytic aluminum slag, 15 parts by weight of bentonite, 20 parts by weight of black humic acid, 20 parts by weight of carbide slag, 20 parts by weight of activated sludge, 8 parts by weight of biogas residue, 15 parts by weight of biogas slurry, and 15 parts by weight of organic fertilizer.

3. The multifunctional windbreak and sand fixation agent for salinized areas according to claim 1, wherein The modified cellulose is selected from one or more of carboxymethyl cellulose, sodium carboxymethyl cellulose, hydroxyethyl cellulose, and straw cellulose derivatives.

4. A method for preparing the multifunctional windbreak and sand fixation agent for salinized areas according to any one of claims 1 to 3, characterized in that, The method comprises the following steps: Mix the water-absorbing and water-retaining resin, modified cellulose, electrolytic aluminum slag, bentonite, black humic acid, carbide slag, activated sludge, biogas residue, biogas slurry, and organic fertilizer evenly at a stirring speed of 150 - 300 rpm to obtain the windbreak and sand fixation agent.

5. The method according to claim 4, wherein The preparation method of the water-absorbing and water-retaining resin comprises the following steps: Step one: Under the condition of nitrogen protection, mix carboxymethyl cellulose and water, heat up and stir to obtain a clear solution; Step two: Add an aqueous solution of persulfate to the clear solution, stir evenly, then add the water-absorbing and water-retaining resin monomer and black humic acid, stir and dissolve, continue to heat up, carry out the reaction under stirring conditions, and then wash and dry to obtain the water-absorbing and water-retaining resin.

6. The method according to claim 5, wherein In step one, The mass ratio of the carboxymethyl cellulose to water is (5 - 20):(450 - 600); Heat up to 55 - 65 °C and stir and dissolve into a clear solution under the stirring condition of 150 - 300 rpm.

7. The method according to claim 5, wherein In step two, Pass nitrogen for more than 30 min, add an aqueous solution of persulfate with a mass fraction of 2 - 5% to the clear solution, the mass ratio of the aqueous solution of persulfate to carboxymethyl cellulose is 75:(5 - 20), keep the temperature at 55 - 65 °C, and continue to stir for 10 - 30 min.

8. The method according to claim 5, characterized in that, In step two, The mass ratio of the water-absorbing and water-retaining resin monomer, black humic acid, and aqueous solution of persulfate is (75 - 125):(15 - 25):75; Under the condition of 55 - 65 °C, add the water-absorbing and water-retaining resin monomer and black humic acid, continue to stir for 0.5 - 1 h, continue to heat up to 65 - 75 °C, and react under stirring conditions for 3 - 4 h.

9. The method according to claim 5, wherein In step two, The drying condition is: drying at 50 - 70 °C for 4 - 8 h.

10. A method for using the multifunctional windbreak and sand fixation agent for salinized areas according to any one of claims 1 to 3, characterized in that, The using method comprises the following steps: Rototill and mix the windbreak and sand fixation agent with sand that is 5 - 30 cm thick. The dosage ratio of the windbreak and sand fixation agent to the area of the sand is (100 - 600) g : 1 m 2 .

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