Dustproof net with long service life and dust suppression method thereof

Abstract

The invention discloses a long-life dustproof net and a dust suppression method thereof, and belongs to the technical field of environmental protection, the long-life dustproof net comprises a dustproof net main body and a surface treatment layer, and the surface treatment layer is a calcium carbonate precipitation layer and uniformly covers the surface of the dustproof net. The physical strength and the chemical stability of the dustproof net are enhanced by forming the protective layer outside the dustproof net body, the dustproof net can be prevented from being blown up by adhering calcium carbonate sediment to a soil body, the ability of the dustproof net to resist severe environmental conditions is improved, the dust suppression effect is improved, and the service life of the dustproof net is prolonged. The dustproof net can keep a stable grid structure in extreme environments such as strong wind, high temperature, ultraviolet irradiation and the like, and is not easy to deform and damage, so that bare soil particles are effectively prevented from being blown up by wind, the dustproof net body can still keep efficient filtering performance in long-term use, the service life of the dustproof net is further prolonged, and the dustproof net is suitable for popularization and application. The replacement frequency caused by material aging is reduced, the maintenance cost is reduced, and the influence of a waste dustproof net on the environment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental protection, and in particular relates to a long-life dust-proof net and a dust suppression method thereof. Background Art

[0002] Existing dust screens often age when exposed to harsh environmental conditions such as wind, sun, and rain. This aging is manifested in the decrease in the strength and toughness of the screen material, the deformation and damage of the mesh, which leads to a decrease in the filtration efficiency of the dust screen and a significant reduction in the dust suppression effect. Specifically, an aged dust screen may not be able to effectively intercept fine particles, exacerbating the dust problem, which not only affects the quality of the surrounding environment, but may also cause harm to human health;

[0003] The effectiveness of EICP soil solidification technology mainly depends on the effective bonding between soil particles formed by calcium carbonate crystals. After being treated with EICP solution, the soil particles are bonded by calcium carbonate, so that the originally loose soil particles are solidified to form complete soil blocks, and the crystal connection between particles can significantly improve the mechanical properties of the soil of the treated sample;

[0004] Although there are a variety of dust-proof net materials and dust suppression methods in the existing technology, they generally have certain limitations. For example, although some dust-proof nets have good initial dust suppression effects, after a period of use, their dust suppression effects will gradually decline due to the insufficient weather resistance of the material itself. At the same time, these technologies can often only focus on improving dust suppression effects or extending service life, lacking a comprehensive solution. This means that in the pursuit of higher dust suppression effects, the service life of the dust-proof net may be sacrificed, and vice versa;

[0005] Therefore, the market is in urgent need of an innovative technology that can overcome the shortcomings of existing technologies, significantly improve the dust suppression effect of dust screens, and effectively extend their service life. This technology should be able to enhance the durability of dust screens in some way while maintaining or improving their filtering performance, thereby ensuring a clean environment while reducing the economic burden and waste of resources caused by frequent replacement of dust screens.

[0006] Based on this, the present invention designs a long-life dust-proof net and a dust suppression method thereof to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to solve the problems of short life of dust-proof net and poor dust suppression effect, and to propose a long-life dust-proof net and a dust suppression method thereof.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A long-life dust-proof net, characterized in that it comprises: a dust-proof net body and a surface treatment layer, wherein the surface treatment layer is a calcium carbonate precipitation layer and is evenly covered on the surface of the dust-proof net to form a solid protective layer, and the dust-proof net body is directly laid on the soil surface and bonded to the soil through the calcium carbonate precipitation layer;

[0010] The base material of the dustproof net body can be synthetic fibers such as polyester, polypropylene, and nylon.

[0011] As a further description of the above technical solution:

[0012] The calcium carbonate precipitation layer is formed by the EICP solution generating calcium carbonate precipitation through urease hydrolysis reaction, and the calcium carbonate precipitation is attached to the surface of the dust-proof net and around the contact point between the dust-proof net and the soil.

[0013] As a further description of the above technical solution:

[0014] The preparation method of the EICP solution comprises the following steps: S1, selecting raw materials, selecting soybean as the urease source; the calcium source may be calcium chloride (CaCl2), calcium acetate (C4H6CaO4) or other calcium-containing compounds; selecting urea (CO(NH2)2) as the carbon source;

[0015] S2, preparing a crusher to crush soybeans to extract urease, preparing a mixing container to hold the raw materials and the solution, and then using a stirrer to ensure that the solution is mixed evenly;

[0016] S3. a. Extracting urease: Put soybeans into a grinder and grind them into powder, then stir and mix them with 10 times the mass of water, let them stand for a while, filter out the dregs through gauze, and obtain a urease solution;

[0017] b. Dissolve the calcium salt: Add an appropriate amount of water to the mixing container, slowly add the calcium salt, and stir continuously with a stirrer until the calcium salt is completely dissolved in the water;

[0018] c. Add carbon source: Add urea as a carbon source to the calcium salt solution, continue to stir the solution to ensure that the urea is completely dissolved, and the concentration ratio of calcium salt to urea is 1:1;

[0019] d. Preparation of EICP solution: Add an equal volume of urease solution to the mixture of calcium salt and urea, and then stir and mix thoroughly;

[0020] S4. Safety measures: During the entire preparation process, operators should wear protective glasses, gloves and lab coats, and should ensure that the process is carried out under good ventilation conditions.

[0021] As a further description of the above technical solution:

[0022] The spraying device is an adjustable spray pot, which can control the spraying intensity and range to ensure that the solution can be sprayed evenly.

[0023] As a further description of the above technical solution:

[0024] The main control factors of the construction process are: spraying volume, spraying sequence and reaction time.

[0025] As a further description of the above technical solution:

[0026] The spraying volume: The reasonable dust suppressant spraying volume in sand is 3.66~4.00L / m 2 ,Since the particle size of silt is smaller than that of sand, it is necessary to verify the applicable spraying volume under the silt conditions in Zhengzhou;

[0027] The spraying order: The EICP reaction product contains calcium carbonate, which aggregates between soil particles, reducing the porosity of the soil, thereby preventing the solution from penetrating and diffusing in the soil. Therefore, the mixing and spraying order of the components in the EICP dust suppressant solution will determine the reaction curing effect;

[0028] The reaction time: As the EICP reaction time increases, urea is continuously decomposed to produce With Ca in solution 2+ Combined with the solidified material, more calcium carbonate is generated. As the calcium carbonate content increases, the surface strength and thickness of the solidified layer of the sample will also increase. In order to explore the relationship between the solidification effect and the action time after the dust suppressant is sprayed, the effect of the reaction time on the solidification effect of the EICP dust suppressant is analyzed.

[0029] As a further description of the above technical solution:

[0030] In order to explore the effect of different volumes of EICP solution on the reinforcement of silt, it is necessary to measure the surface compressive strength and thickness of the solidified layer of soil samples prepared with different spraying volumes.

[0031] As a further description of the above technical solution:

[0032] The analysis of the corresponding relationship between the thickness of the solidified layer and the surface compressive strength shows that as the thickness of the solidified layer increases, the surface compressive strength also increases, and there is a linear relationship between the two. The linear relationship curve between the thickness of the solidified layer and the compressive strength is as follows:

[0033] y=78.3499x-66.1416(R 2 =0.938)(4.2)

[0034] Where: y——surface compressive strength, kPa;

[0035] x——the thickness of the cured layer, mm.

[0036] The variance of the coupling function is 0.938, and all measured values ​​are within the 95% confidence interval of the function. Therefore, it can be considered that the surface compressive strength and thickness of the silt solidification layer in actual construction follow this functional relationship.

[0037] The long-life dust-proof net dust suppression method comprises the following steps:

[0038] S1. Use clean water and neutral detergent to thoroughly clean the dust screen to remove dust, oil and other impurities on the surface;

[0039] S2. After cleaning, check whether the dust screen is damaged or deformed, and ensure that the screen surface is intact and has no defects that affect the treatment effect;

[0040] S3. Prepare EICP solution of appropriate concentration and viscosity according to the material of the dustproof net and on-site environmental conditions.

[0041] S4. Use professional spraying equipment, such as a high-pressure spray gun, to evenly spray the EICP solution on the dustproof net, ensuring that every part is fully exposed to the solution;

[0042] S5. The EICP solution undergoes a chemical reaction, gradually forming calcium carbonate precipitation on the surface of the dust-proof net and between the dust-proof net and soil particles.

[0043] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0044] The present invention enhances the physical strength and chemical stability of the dustproof net by forming a protective layer outside the dustproof net body. The dustproof net is bonded to the soil body through calcium carbonate precipitation to prevent the dustproof net from being blown up, which not only improves its ability to resist adverse environmental conditions, but also improves the dust suppression effect. In extreme environments such as strong winds, high temperatures, and ultraviolet radiation, it can maintain a stable grid structure and is not easy to deform and break, thereby effectively preventing bare soil particles from being blown up by the wind, so that the dustproof net body can still maintain high-efficiency filtering performance during long-term use, further extending the service life of the dustproof net, reducing the replacement frequency due to material aging, reducing maintenance costs, and reducing the impact of discarded dustproof nets on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of a main body of a dust-proof net with a long service life and a dust suppression method thereof proposed by the present invention;

[0046] Figure 2 A schematic diagram of the connection between a main body of a dust-proof net and a surface treatment layer of a long-life dust-proof net and a dust suppression method thereof proposed by the present invention;

[0047] Figure 3A schematic diagram of the spray volume and compressive strength of a long-life dust-proof net and a dust suppression method thereof proposed by the present invention;

[0048] Figure 4 A schematic diagram of the linear relationship between the thickness of the solidified layer and the compressive strength of a long-life dust-proof net and a dust suppression method thereof proposed by the present invention;

[0049] Figure 5 A microscopic schematic diagram of a silt sample of a long-life dust-proof net and a dust suppression method thereof proposed by the present invention;

[0050] Figure 6 This is a schematic diagram of XRD under different reaction liquid volumes for a long-life dust-proof net and a dust suppression method thereof proposed by the present invention;

[0051] Figure 7 A schematic diagram of the linear relationship between the effect of the spraying mode of a long-life dust-proof net and a dust suppression method thereof on the curing effect proposed by the present invention;

[0052] Figure 8 This is a schematic diagram of the linear relationship between the reaction time of a long-life dust-proof net and a dust suppression method thereof proposed by the present invention and the effect of the curing effect. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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] Please see attached Figure 1 -Attached Figure 8 , the present invention provides a technical solution: a long-life dust-proof net and a dust suppression method thereof, comprising: a dust-proof net main body and a surface treatment layer;

[0055] The surface treatment layer is a calcium carbonate precipitation layer, which is evenly covered on the surface of the dustproof net to form a solid protective layer; this protective layer can effectively resist ultraviolet radiation, oxidation and chemical erosion, and the main body of the dustproof net is directly laid on the soil surface and bonded to the soil through calcium carbonate precipitation.

[0056] The base material of the dust screen body can be polyester, polypropylene, nylon and other synthetic fibers. After being treated with EICP solution, the durability of these materials has been significantly improved.

[0057] The formation of the calcium carbonate precipitation layer is that the EICP solution generates calcium carbonate precipitation through urease hydrolysis reaction, and adheres to the surface of the dustproof net and around the contact points between the dustproof net and the soil. Due to the existence of the calcium carbonate precipitation layer, the service life of the dustproof net in harsh environments is extended, and the replacement frequency caused by material aging is reduced. The treated dustproof net can adapt to various climatic conditions, including high temperature, low temperature, humidity changes, etc., and maintain its stable performance.

[0058] Preparation method of EICP solution: S1. Select raw materials, select soybean as the source of urease; the calcium source can be calcium chloride (CaCl2), calcium acetate (C4H6CaO4) or other calcium-containing compounds; select urea (CO(NH2)2) as the carbon source;

[0059] S2, preparing a crusher to crush soybeans to extract urease, preparing a mixing container to hold the raw materials and the solution, and then using a stirrer to ensure that the solution is mixed evenly;

[0060] S3. a. Extracting urease: Put soybeans into a grinder and grind them into powder, then stir and mix them with 10 times the mass of water, let them stand for a while, filter out the dregs through gauze, and obtain a urease solution;

[0061] b. Dissolve the calcium salt: Add an appropriate amount of water to the mixing container, slowly add the calcium salt, and stir continuously with a stirrer until the calcium salt is completely dissolved in the water;

[0062] c. Add carbon source: Add urea as a carbon source to the calcium salt solution, continue to stir the solution to ensure that the urea is completely dissolved, and the concentration ratio of calcium salt to urea is 1:1;

[0063] d. Preparation of EICP solution: Add an equal volume of urease solution to the mixture of calcium salt and urea, and then stir and mix thoroughly;

[0064] S4. Safety measures: During the entire preparation process, operators should wear protective glasses, gloves and lab coats, and should ensure that the process is carried out under good ventilation conditions;

[0065] The spraying device is an adjustable spray pot that can control the spraying intensity and range to ensure that the solution can be sprayed evenly.

[0066] The main control factors of the construction process are: spraying volume, spraying order and reaction time; spraying volume: the reasonable dust suppressant spraying volume in sand is 3.66~4.00L / m 2 Since the particle size of silt is smaller than that of sand, it is necessary to verify the applicable spraying volume under the silt conditions in Zhengzhou. The designed spraying volume gradient tests are: 0L / m 2 , 1L / m 2 , 2L / m 2 , 3L / m 2, 4L / m 2 , 5L / m 2 After curing, the surface strength is measured with a digital push-pull force gauge, and the shell thickness is measured with a digital vernier caliper. The test groups and results are shown in Table 4.4.

[0067] Table 4.4 Grouping and results of different spraying volume tests;

[0068]

[0069]

[0070] Spraying order: The EICP reaction product contains calcium carbonate. The aggregation of calcium carbonate between soil particles will reduce the porosity of the soil, thereby preventing the solution from penetrating and diffusing in the soil. Therefore, the mixing and spraying order of the components in the EICP dust suppressant solution will determine the reaction solidification effect. The dust suppressant solution can be divided into three cases according to the mixing order: ① first spray the urease solution with the urea solution, and then spray the calcium chloride solution; ② or first spray the urea solution with the calcium chloride solution, and then spray the urease solution; ③ direct mixing and spraying. The test used spraying pots I and II to load different solutions according to three spraying orders, and sprayed them at intervals of 1h. According to the area ratio calculation, the total volume of EICP solution sprayed on this sample is 120mL. The reasonable reaction solution mixing order is obtained by comparing the surface strength and crust thickness of the samples under different working conditions. The test grouping and results are shown in Table 4.5.

[0071] Table 4.5 Grouping and results of different mixing order tests

[0072]

[0073] Reaction time: As the EICP reaction time increases, urea is continuously decomposed to produce With Ca in solution 2+ Combined with, more calcium carbonate is generated. As the calcium carbonate content continues to increase, the surface strength and thickness of the solidified layer of the sample will also increase. In order to explore the relationship between the solidification effect and the action time after the dust suppressant is sprayed, the effect of reaction time on the solidification effect of the EICP dust suppressant is analyzed. According to the concentration and proportion of the EICP dust suppressant obtained in the previous article, a binder with a mass concentration of 1.25 mol / L was prepared, mixed with an equal volume of soybean urease solution to prepare an EICP solution, and sprayed on the surface of the silt sample according to the spraying volume determined in 4.3.1.2. The surface strength and shell thickness of each sample were tested at 1h, 3h, 6h, 9h, 12h, 15h, 18h, 21h, 24h, 48h, and 72h after spraying. The test groups and results are shown in Table 4.6.

[0074] Table 4.6 Grouping and results of different reaction time tests;

[0075]

[0076] In order to explore the effect of different volumes of EICP solution on the reinforcement of silt, the surface compressive strength and thickness of the solidified layer of soil samples prepared with different spraying volumes were measured. The test results are shown in Figure 2. Figure 2 As can be seen from the figure, when the spraying volume is small, the reaction liquid cannot fully penetrate the silt, and only a thin crust layer is formed on the surface, which has a limited solidification effect on the soil, resulting in a low surface compressive strength of the sample. The spraying volume is 1L / m 2 When the spraying volume is 4L / m, the surface compressive strength of the sample is only 205.65kPa, and the thickness of the surface solidified layer is 12.04mm. As the spraying volume increases, the solution penetrates the soil sample more fully, and the surface compressive strength of the sample gradually increases. 2 When the spraying volume continued to increase, the surface compressive strength and the thickness of the solidified layer did not increase significantly. When the spraying volume was 5L / m 2 When the sample was sprayed with 4L / m2, the surface compressive strength was about 742.4kPa, and the thickness of the surface solidified layer was 15.01mm. The reason is that as the volume of the reaction solution increases, calcium carbonate precipitation is generated between the surface silt particles, which hinders the further penetration of the reaction solution, so the solidification effect also reaches the critical value. Therefore, in the subsequent spraying tests, 4L / m2 was selected. 2 Spray volume;

[0077] The corresponding relationship between the thickness of the solidified layer and the surface compressive strength was analyzed, and it was found that as the thickness of the solidified layer increased, the surface compressive strength also increased, and there was a linear relationship between the two. The linear relationship curve between the thickness of the solidified layer and the compressive strength is as follows:

[0078] y=78.3499x-66.1416(R 2 =0.938)(4.2)

[0079] Where: y——surface compressive strength, kPa;

[0080] x——the thickness of the cured layer, mm.

[0081] The variance of the coupling function is 0.938, and all measured values ​​are within the 95% confidence interval of the function. Therefore, it can be considered that the surface compressive strength and thickness of the silt solidification layer in actual construction follow this functional relationship.

[0082] The concentration of the cementing liquid is 1.25 mol / L, and the spraying volume is 3-5 L / m 2The silt samples treated with EICP were subjected to SEM scanning and XRD scanning, and the silt samples without spraying treatment were set as the control group in the microscopic scanning. The obtained microscopic images are shown in Figure 5 and Figure 6 ;

[0083] Compared to Figure 5 The untreated bare soil in (a) to (c) showed obvious cementation after being treated with the reaction solution. Figure 5 From (d) to (f), we can see that the concentration of the cementing fluid is 1.25 mol / L and the spraying volume is 3 L / m 2 When the CaCO3 crystal is formed, it is usually cubic calcite, with a thin coating and no large area of ​​calcium carbonate crystals superimposed. Figure 5 From (g) to (i), we can see that the concentration of the cementing fluid is 1.25 mol / L and the spraying volume is 4 L / m 2 When the soil particles are completely covered by CaCO3 crystals, the crystals contain not only calcite but also vaterite. These crystals make fine particles adsorb on the surface of soil particles through their own cementation, forming a calcium carbonate crystal coating layer and a layered structure. Figure 5 (k)~(m) It can be seen that the concentration of the cementing liquid is 1.25mol / L and the spraying volume is 5L / m 2 When the spraying volume increases, abundant CaCO3 crystals are generated in the sample and overlap and interweave on the surface of the silt particles. In summary, when the concentration of the cementing solution is constant, as the spraying volume increases, the newly formed CaCO3 crystals will precipitate on the surface of the silt particles, significantly reducing the pores between the soil particles. However, it is worth noting that when the spraying volume reaches a certain level, as the spraying volume of the EICP solution increases, the increase in the silt solidification effect is not obvious;

[0084] according to Figure 6 XRD phase composition of Zhengzhou silt and plain soil after EICP treatment. Figure 3 The compressive strength of the soil samples was analyzed together with the changes in the solidification strength of the soil samples caused by the changes in the spraying volume of the dust suppressant;

[0085] Figure 6 The relative diffraction intensity reflects the relative content of the phase composition in the silt sample after EICP technology solidification. With the increase of spraying volume, the peak value of the diffraction peak of each crystal also changes, which represents the change of the relative content of the crystal components. Among them, the diffraction peak intensity corresponding to the crystal planes (100), (012), (101), (021), (112), (202), (023) representing quartz (SiO2) has decreased, especially when the diffraction angle is 26.7°, the diffraction peak intensity of the crystal plane (101) increases from 0L / m to 1.5L / m. 2 The spray volume of 3985 was reduced to 3L / m 2, 4L / m 2 , 5L / m 2 1434, 339, 717 when sprayed. In addition, in the crystal planes (111), (012), (211) representing vaterite and the crystal planes (110) and (200) representing calcite, the corresponding diffraction peak intensities all increase to varying degrees with the increase of the spraying volume. This shows that with the increase of the spraying volume of the EICP reaction solution, the proportion of SiO2, the main component of the silt in the sample, decreases, because the relative proportion of CaCO3 in the sample gradually increases. The growth law of CaCO3 is consistent with the growth law of unconfined compressive strength, which further reveals the mechanism of EICP technology solidification of silt, that is, the more complete the soybean urease-induced calcium carbonate reaction, the more calcium carbonate is generated, and the better the physical and mechanical properties of the soil after reinforcement. In addition, through the analysis of the experimental results, no additional diffraction peaks appeared in the XRD spectrum, proving that spraying different volumes of EICP solution does not affect the generated crystals and crystal forms;

[0086] In order to explore the effect of different spraying orders of the components of the EICP solution on the curing effect, the soil samples were sprayed step by step according to the working conditions in Table 4.5. The interval between the two sprayings was 60 minutes. The second spraying was carried out after the first solution was fully penetrated. After curing for 3 days in a 25℃ environment, the surface compressive strength and the thickness of the cured layer were measured respectively. The test results are shown in Figure 7 ;

[0087] In working condition W1, urea and urease solution are sprayed first, and then calcium chloride solution is sprayed; in working condition W3, urea, urease and calcium chloride solution are sprayed at the same time. The curing effect in both cases is not ideal. The reason is that in working conditions W1 and W3, urease solution and urea solution are first mixed, and then sprayed on the surface of silt, that is, the urea hydrolysis reaction starts earlier, causing carbonate ions to be generated in the solution prematurely. Therefore, when calcium ions appear in the environment, calcium carbonate precipitates will be generated quickly and cemented together with soil particles, hindering the penetration of surface solution into deep soil, resulting in the compressive strength of the treated soil and the thickness of the cured layer failing to achieve the expected effect. In working condition W2, the hydrolysis of urea and the precipitation of calcium carbonate do not begin until the urease solution is sprayed, so the EICP solution can fully penetrate and diffuse in the deep silt, ensuring that the thickness of the cured layer and the compressive strength of the soil achieve better results. Based on this, subsequent tests will continue to use working condition W2 in order to obtain better curing effects;

[0088] In order to explore the effect of different reaction times on the curing effect, the sample was divided into multiple areas, and the surface strength of the corresponding areas was measured at different reaction times. The test results are shown in Figure 8 ;

[0089] like Figure 8As shown in the figure, it reflects that the initial curing effect improves rapidly. Taking the surface strength of the sample cured for 72 hours as the reference value of the curing effect, the curing effect can reach 80% after 15 hours of reaction and 90% after 24 hours. As the calcium carbonate precipitation reaction proceeds further, a cementing and curing layer of calcium carbonate and silt is formed on the surface of the sample, preventing the reaction liquid from continuing to penetrate into the soil. After that, the incompletely reacted solution in the deep layer of the soil will continue to precipitate and form more calcium carbonate crystals until the reaction is completely completed. It can be seen from the results that the EICP curing reaction proceeds rapidly in the early stage, and the reaction rate gradually decreases with the passage of time. In actual engineering applications, the reaction time can be adjusted according to the required curing effect and time requirements in order to obtain the optimal benefit.

[0090] The long-life dust-proof net dust suppression method includes the following steps:

[0091] S1. Use clean water and neutral detergent to thoroughly clean the dust screen to remove dust, oil and other impurities on the surface;

[0092] S2. After cleaning, check whether the dust screen is damaged or deformed, and ensure that the screen surface is intact and has no defects that affect the treatment effect;

[0093] S3. Prepare EICP solution of appropriate concentration and viscosity according to the material of the dustproof net and on-site environmental conditions.

[0094] S4. Use professional spraying equipment, such as a high-pressure spray gun, to evenly spray the EICP solution on the dustproof net, ensuring that every part is fully exposed to the solution;

[0095] S5. The EICP solution undergoes a chemical reaction, gradually forming calcium carbonate precipitation on the surface of the dust-proof net and between the dust-proof net and soil particles.

[0096] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A long-life dustproof net, characterized in that: include: The dust-proof net body and the surface treatment layer, the surface treatment layer is a calcium carbonate precipitation layer, and is evenly covered on the surface of the dust-proof net to form a solid protective layer, and the dust-proof net body is directly laid on the soil surface and bonded to the soil through the calcium carbonate precipitation layer; The base material of the dustproof net body can be synthetic fibers such as polyester, polypropylene, and nylon.

2. A long-life dustproof net, characterized in that: The calcium carbonate precipitation layer is formed by the EICP solution generating calcium carbonate precipitation through urease hydrolysis reaction, and the calcium carbonate precipitation is attached to the surface of the dust-proof net and around the contact point between the dust-proof net and the soil.

3. A long-life dustproof net, characterized in that: Preparation method of the EICP solution: S1. Select raw materials, select soybean as the source of urease; the calcium source can be calcium chloride (CaCl2), calcium acetate (C4H6CaO4) or other calcium-containing compounds; select urea (CO(NH2)2) as the carbon source; S2, preparing a crusher to crush soybeans to extract urease, preparing a mixing container to hold the raw materials and the solution, and then using a stirrer to ensure that the solution is mixed evenly; S3. a. Extracting urease: Put soybeans into a grinder and grind them into powder, then stir and mix them with 10 times the mass of water, let them stand for a while, filter out the dregs through gauze, and obtain a urease solution; b. Dissolve the calcium salt: Add an appropriate amount of water to the mixing container, slowly add the calcium salt, and stir continuously with a stirrer until the calcium salt is completely dissolved in the water; c. Add carbon source: Add urea as a carbon source to the calcium salt solution, continue to stir the solution to ensure that the urea is completely dissolved, and the concentration ratio of calcium salt to urea is 1:1; d. Preparation of EICP solution: Add an equal volume of urease solution to the mixture of calcium salt and urea, and then stir and mix thoroughly; S4. Safety measures: During the entire preparation process, operators should wear protective glasses, gloves and lab coats, and should ensure that the process is carried out under good ventilation conditions.

4. A long-life dustproof net, characterized in that: The spraying device is an adjustable spray pot, which can control the spraying intensity and range to ensure that the solution can be sprayed evenly.

5. A long-life dustproof net, characterized in that: The main control factors of the construction process are: spraying volume, spraying sequence and reaction time.

6. A long-life dustproof net, characterized in that: The spraying volume: The reasonable dust suppressant spraying volume in sand is 3.66~4.00L / m 2 ,Since the particle size of silt is smaller than that of sand, it is necessary to verify the applicable spraying volume under the silt conditions in Zhengzhou; The spraying order: The EICP reaction product contains calcium carbonate, which aggregates between soil particles, reducing the porosity of the soil, thereby preventing the solution from penetrating and diffusing in the soil. Therefore, the mixing and spraying order of the components in the EICP dust suppressant solution will determine the reaction curing effect; The reaction time: As the EICP reaction time increases, urea is continuously decomposed to produce CO 2 3 - , and Ca in solution 2+ Combined with the solidified material, more calcium carbonate is generated. As the calcium carbonate content increases, the surface strength and thickness of the solidified layer of the sample will also increase. In order to explore the relationship between the solidification effect and the action time after the dust suppressant is sprayed, the effect of the reaction time on the solidification effect of the EICP dust suppressant is analyzed.

7. A long-life dustproof net, characterized in that: In order to explore the effect of different volumes of EICP solution on the reinforcement of silt, it is necessary to measure the surface compressive strength and thickness of the solidified layer of soil samples prepared with different spraying volumes.

8. A long-life dustproof net, characterized in that: The analysis of the corresponding relationship between the thickness of the solidified layer and the surface compressive strength shows that as the thickness of the solidified layer increases, the surface compressive strength also increases, and there is a linear relationship between the two. The linear relationship curve between the thickness of the solidified layer and the compressive strength is as follows: y=78.3499x-66.1416(R 2 =0.938)(4.2) Where: y——surface compressive strength, kPa; x——the thickness of the cured layer, mm. The variance of the coupling function is 0.938, and all measured values ​​are within the 95% confidence interval of the function. Therefore, it can be considered that the surface compressive strength and thickness of the silt solidification layer in actual construction follow this functional relationship.

9. A long-life dust-proof net and a dust suppression method thereof, according to any one of claims 1 to 7, characterized in that: The long-life dust-proof net dust suppression method comprises the following steps: S1. Use clean water and neutral detergent to thoroughly clean the dust screen to remove dust, oil and other impurities on the surface; S2. After cleaning, check whether the dust screen is damaged or deformed, and ensure that the screen surface is intact and has no defects that affect the treatment effect; S3. Prepare EICP solution of appropriate concentration and viscosity according to the material of the dustproof net and the on-site environmental conditions; S4. Use professional spraying equipment, such as a high-pressure spray gun, to evenly spray the EICP solution on the dustproof net, ensuring that every part is fully exposed to the solution; S5. The EICP solution undergoes a chemical reaction, gradually forming calcium carbonate precipitation on the surface of the dust-proof net and between the dust-proof net and soil particles.

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