Foam dust suppression material as well as preparation method and application thereof

Abstract

The invention provides a foam dust suppression material as well as a preparation method and application thereof. The foam dust suppression material comprises a foaming agent, a surfactant, a thickening agent, inorganic salt and a solvent; wherein the foaming agent comprises soybean protein isolate and / or collagen; the surfactant comprises an anionic surfactant and / or a nonionic surfactant; the inorganic salt comprises one or more of potassium sulfate, magnesium chloride, sodium sulfate and sodium chloride. According to the foam dust suppression material, specific components are adopted, all the components cooperate with one another, and the dust suppression material is high in foaming rate, good in stability, good in dust suppression effect, environmentally friendly, non-toxic to the human body, capable of protecting the health of workers and improving the comfort level of the working environment, low in cost and good in economic benefit and social benefit.

Description

Technical Field

[0001] The present invention relates to the technical field of dust suppression materials, and in particular to a foam dust suppression material, a preparation method and application thereof. Background Art

[0002] In recent years, with the improvement of coal mining mechanization, the output of coal mines has also increased year by year. However, the advancement of mechanized mining has also aggravated the severity of the floating dust problem in coal mines. Especially in the fully mechanized mining face, the amount of dust generated is huge, and the dust concentration is sometimes as high as 1000-2000mg / m 3 . Long-term exposure to such a high concentration of dust environment poses a serious threat to the respiratory system and physical health of underground workers. What is more serious is that the coal mining process is accompanied by the generation of gas. Gas is a highly flammable gas. When dust and gas coexist and reach a certain concentration, it is very likely to cause a catastrophic explosion accident when encountering open flames or high temperature conditions. This poses a direct threat to the life safety of miners and may also cause huge economic losses and environmental damage. Therefore, effectively controlling the dust concentration in coal mines is not only an urgent need to protect the health and life safety of miners, but also the key to preventing gas explosion accidents and maintaining the sustainable development of the coal industry.

[0003] In addition, as the global demand for mineral resources continues to grow, mining activities are becoming more frequent. This high-frequency mining operation not only accelerates the consumption of natural resources, but also makes dust hazards a major problem that cannot be ignored. Dust, a seemingly tiny particle, actually contains huge health and environmental risks. In mining, crushing, screening, transportation and other links, a large amount of dust is released into the air. These dusts not only contain tiny particles of the ore itself, but may also contain harmful substances such as heavy metals and radioactive elements. When workers are exposed to such dust environments for a long time, their respiratory systems are the first to be damaged. Occupational diseases such as pneumoconiosis and silicosis are the direct consequences of lung tissue fibrosis after long-term inhalation of dust, which seriously damages the health of workers and even threatens their lives. The impact of dust on surrounding residents and the ecological environment should not be underestimated. Dust drifts with the wind and can cover a large area, reduce air quality, and affect the daily life and health of residents. Long-term inhalation of dust including harmful substances may expose residents to a variety of health risks such as respiratory diseases and cardiovascular diseases. At the same time, dust can pollute water sources and soil, destroy ecological balance, affect the growth and yield of crops, and threaten food safety and the human food chain. What is more serious is that some harmful substances in dust may accumulate in organisms through the food chain, causing bioaccumulation. This not only poses a threat to wild animals, but may also affect human health through human consumption of contaminated food. In addition, dust may also intensify the greenhouse effect, have a negative impact on the global climate, and further increase the complexity of environmental issues.

[0004] At present, a variety of dust suppression technologies and materials are used to address the problem of high-concentration dust in coal mines, mainly including spray dust suppression, the use of chemical or bio-based dust suppressants, and enhanced ventilation dust suppression. However, these traditional dust suppression methods and technologies have their own advantages and disadvantages, which are analyzed as follows: Spray dust suppression: Spray dust suppression is one of the most common dust suppression measures, which captures and precipitates coal dust by spraying water mist into the underground environment. However, the hydrophobicity of coal dust leads to low contact efficiency between water droplets and dust, and the dust suppression effect is limited; in addition, the spray process consumes a lot of water resources, increases mining costs, and is prone to secondary dust in a dry environment, further deteriorating the air quality underground. Chemical dust suppressants: Chemical dust suppressants improve dust suppression efficiency by changing the surface properties of dust particles and increasing their hydrophilicity. This type of dust suppressant usually includes high molecular weight substances such as polyacrylamide and polyvinyl alcohol, as well as certain surfactants. However, the use of chemical dust suppressants may cause environmental pollution, and some compounds are potentially harmful to human health, and long-term exposure may cause respiratory diseases. Bio-based dust suppressants: Compared with chemical dust suppressants, bio-based dust suppressants are mainly composed of natural plant ingredients, such as cellulose, protein, etc., which are more environmentally friendly and less harmful to the human body. However, their dust reduction effect and stability are usually not as good as chemical dust suppressants, and the cost is relatively high. Enhanced ventilation dust reduction: By enhancing the underground ventilation system, the dust is diluted and discharged from the mine to reduce the dust concentration. This method has high requirements for the mine ventilation system, and the effect is limited by the ventilation efficiency, while increasing the ventilation power consumption cost. Foam dust suppressant: Foam dust suppression is a more advanced dust suppression technology in recent years. It covers the dust with high-density foam, effectively isolates the air, reduces the dust concentration and prevents secondary dust. However, the foaming rate and stability of existing foam dust suppressants are generally poor, the chemical components in their formulas may pose a threat to human health, and the preparation and use costs of foam dust suppressants are relatively high.

[0005] Based on the above analysis, existing dust suppression technologies and materials have certain limitations in practical applications and cannot effectively solve the problem of high-concentration dust in coal mines, especially in terms of improving dust suppression efficiency, environmental protection, avoiding secondary dust, and reducing use costs. Summary of the invention

[0006] The main purpose of the present invention is to provide a foam dust suppression material, a preparation method and application thereof, so as to solve the problems in the prior art that the dust removal technology has poor dust suppression effect, the foam dust remover is not environmentally friendly, has a low foaming rate, poor stability and high cost.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a foam dust suppression material is provided, comprising a foaming agent, a surfactant, a thickener, an inorganic salt and a solvent; wherein the foaming agent comprises soy protein isolate and / or collagen; the surfactant comprises an anionic surfactant and / or a non-ionic surfactant; and the inorganic salt comprises one or more of potassium sulfate, magnesium chloride, sodium sulfate and sodium chloride.

[0008] Furthermore, in the foam dust suppression material, the weight ratio of the foaming agent to the surfactant is 1:(10-50); and / or the weight ratio of the foaming agent to the inorganic salt is 1:(15-30); and / or the weight ratio of the foaming agent to the thickener is 1:(10-20).

[0009] Furthermore, the foam dust suppression material includes, by weight percentage, 0.015-0.02% of a foaming agent, 0.15-0.18% of a surfactant, 0.15-0.4% of a thickener, 0.2-0.3% of an inorganic salt and the remainder a solvent.

[0010] Furthermore, the anionic surfactant includes one or more of sodium dodecylbenzene sulfonate, sodium dodecyl sulfate and sodium salt of dioctyl sulfosuccinate, the nonionic surfactant includes one or more of sodium fatty alcohol polyoxyethylene ether sulfonate, Triton X-100 and isooctyl alcohol polyoxyethylene ether; and / or, the thickener includes one or more of sodium carboxymethyl cellulose, sodium alginate and guar gum; and / or, the solvent includes water.

[0011] Furthermore, the foaming agent is a mixture of soy protein isolate and collagen, wherein the weight ratio of soy protein isolate to collagen is (5-8):(2-5); and / or the surfactant is a mixture of sodium dodecylbenzene sulfonate and polyoxyethylene isooctyl alcohol ether, wherein the weight ratio of sodium dodecylbenzene sulfonate to polyoxyethylene isooctyl alcohol ether is (2-5):(3-6); and / or the thickener is a mixture of sodium carboxymethyl cellulose, sodium alginate and guar gum, wherein the weight ratio of sodium carboxymethyl cellulose, sodium alginate and guar gum is (4-6):(7-9):(2-4); and / or the inorganic salt is a mixture of potassium sulfate and magnesium chloride, wherein the weight ratio of potassium sulfate to magnesium chloride is (4-6):(1-3).

[0012] Furthermore, in the foam dust suppression material, the total volume of the foam is 400 to 800 mL; and / or the half-life of the foam is 1440 to 1750 min; and / or the dust reduction efficiency of the foam dust suppression material is ≥80%; and / or the surface tension of the foam dust suppression material is 29 to 40 mN / m; and / or the water contact angle of the foam dust suppression material is 27 to 40°.

[0013] According to another aspect of the present invention, a method for preparing the foam dust suppression material is provided, wherein a foaming agent, a surfactant, a thickener, an inorganic salt and a solvent are first mixed to obtain the foam dust suppression material.

[0014] Furthermore, the foaming agent, surfactant, thickener and solvent are firstly mixed for the second time, then cooled, and inorganic salt is added, and then mixed for the third time to obtain the foam dust suppression material.

[0015] Further, the second mixing speed is 50-100 rpm, the time is 30-120 min, and the temperature is 40-60° C.; and / or, the cooling end temperature is 20-30° C.; and / or, the third mixing speed is 30-50 rpm, and the time is 1-30 min.

[0016] According to another aspect of the present invention, there is provided application of the foam dust suppression material in the mining field.

[0017] The foam dust suppression material of the present invention adopts specific components, and the components cooperate with each other. The modification effect of the surfactant on the foaming agent changes the rigid structure of the foaming agent protein, which not only increases the foaming volume, but also reduces the surface tension, making it easier for the protein to adsorb and expand the interface. The addition of inorganic salts promotes the full dissolution of the foaming agent and attracts coal molecules to combine with the foam through electrostatic action. The addition of thickener makes the foam and coal powder combine more closely, enhances the coagulation effect, effectively improves the foaming rate, foam stability and dust suppression effect of the dust suppression material, can also greatly reduce the water consumption, effectively suppress the diffusion of dust, and can maintain the dust suppression effect for a long time.

[0018] In summary, the foam dust suppression material of the present application not only has a high foaming rate, good stability, and good dust suppression effect, but is also environmentally friendly, non-toxic to the human body, can protect the health of workers, and improve the comfort of the working environment, but also has low cost and good economic and social benefits. The foam dust suppression material of the present application is used in the mining field to effectively prevent coal dust explosions, improve mine safety, reduce the impact of dust on surrounding residents, and improve the community environment. In addition, the foam dust suppression material of the present application also has good biodegradability and is environmentally friendly. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below in conjunction with the embodiments.

[0020] As described in the background of the present invention, the existing technology has the problems of poor dust suppression effect of dust removal technology, non-environmental protection, low foaming rate, poor stability and high cost of foam dust removal agents. In order to solve the above problems, in a typical embodiment of the present invention, a foam dust suppression material is provided, including a foaming agent, a surfactant, a thickener, an inorganic salt and a solvent; wherein the foaming agent includes soy protein isolate and / or collagen; the surfactant includes an anionic surfactant and / or a non-ionic surfactant; the inorganic salt includes one or more of potassium sulfate, magnesium chloride, sodium sulfate and sodium chloride.

[0021] The dust suppression material of the present application specially selects a green and environmentally friendly foaming agent, which not only has excellent emulsification, hydration and foaming properties, but also can significantly improve the dust reduction efficiency of the dust suppression material while ensuring the life safety of the operators.

[0022] In addition, the present application particularly prefers surfactants in dust suppression materials. This type of surfactant can undergo modification reaction with the above-mentioned foaming agent, improve its solubility and viscosity, increase foaming volume, reduce solvent surface tension, and improve the wettability and adhesion of dust suppression materials to coal dust, thereby effectively improving the dust suppression effect. The inventors particularly consider that the nitrogen atoms in cationic surfactants contain lone pairs of electrons and only have good performance in acidic media. Therefore, the surfactants in the present application do not use cationic surfactants to adapt to more usage environments. It should be noted that compared to the types of surfactants commonly used in the prior art, such as sodium sulfate of fatty alcohol ether, fatty acid methyl ester ethoxylate sulfonate, etc., the specific types of surfactants in the present application have more stable and excellent foaming properties, which are more conducive to modifying the foaming agent and increasing synergistic effects.

[0023] In addition, the present application also uses a specific type of inorganic salt, which can cooperate with the above-mentioned surfactant to improve the ionization characteristics and wettability of the dust suppression material, attract coal molecules to combine with foam through electrostatic action, reduce the surface tension of the solvent, reduce the contact angle of the dust suppression material, and fully dissolve the foaming agent, effectively increasing the wettability and dust suppression effect of the dust suppression material on coal dust. It should be noted that compared with the commonly used inorganic salt types in the prior art, such as calcium chloride, the specific type of inorganic salt in the present application has excellent moisture retention, which is more conducive to enhancing the hydrophobic effect of the hydrophobic end of the coal dust. More surfactant molecules escape the water phase and gather at the liquid-gas interface, thereby effectively reducing the surface tension of the solution.

[0024] In addition, the addition of thickener further enhances the combination of foam and coal powder, improves the foaming rate, foam stability and dust suppression effect of the dust suppression material, while reducing water consumption, effectively inhibiting dust diffusion, and maintaining the dust suppression effect for a longer period of time.

[0025] Compared with water mist materials, the unique structure of the foam in the foam dust suppression material of the present application provides a large surface area in contact with the coal dust, which makes the dust reduction efficiency high (for example, 5 to 8 times higher than that of spray dust removal). The protective film formed by the foam covers the surface of the coal dust to prevent liquid loss, so that less water is used in the preparation process of the dust suppression material (for example, compared with spray dust reduction, the water consumption can be reduced to 30%). The modification effect of the surfactant on the foaming agent changes the rigid structure of the foaming agent protein, which not only increases the foaming volume, but also reduces the surface tension, making it easier for the protein to adsorb and expand the interface. The addition of inorganic salts promotes the full dissolution of the foaming agent and attracts coal molecules to combine with the foam through electrostatic action. The addition of thickener makes the foam and coal powder combine more closely, enhances the coagulation effect, and effectively improves the foaming rate, foam stability and dust suppression effect of the dust suppression material. In summary, the foam dust suppression material of the present application not only has a high foaming rate, good stability, and good dust suppression effect, but is also environmentally friendly, non-toxic to the human body, can protect the health of workers, and improve the comfort of the working environment, but also has low cost and good economic and social benefits.

[0026] After a large number of experimental studies, the inventors have optimized the proportion of each component in the dust suppression material. In a preferred embodiment, in the foam dust suppression material, the weight ratio of the foaming agent to the surfactant is 1: (10-50); and / or, the weight ratio of the foaming agent to the inorganic salt is 1: (15-30); and / or, the weight ratio of the foaming agent to the thickener is 1: (10-20). If the foaming agent content is too high, the foaming agent solubility may be low and the stability may be reduced. If the foaming agent content is too low, the contact angle and surface tension of the dust suppression material may increase. If the surfactant content is too high, the stability of the foaming dust suppressant may decrease, the foam performance may be weakened, and the dust suppression effect may be reduced. If the surfactant content is too low, the foam stability and dust suppression effect of the foaming dust suppressant may be reduced, thereby weakening its effectiveness in suppressing dust diffusion and improving air quality. If the inorganic salt content is too high, the stability of the foaming dust suppressant may be reduced, affecting its dust suppression effect, and may pose potential risks to the environment and human health. If the content of inorganic salts is too low, the dust suppression effect of the foaming dust suppressant may be reduced, thereby weakening its effectiveness in controlling dust and reducing air pollution. If the thickener content is too high, the viscosity of the foam liquid may increase, which is not conducive to the use of the foaming device. If the thickener content is too low, the bonding effect between the foam liquid and the coal dust may be reduced, which may easily lead to secondary dust. Within the specific scope of this application, the foam dust suppression material can form a finer and more durable foam, thereby more effectively improving the dust suppression effect, while further reducing the amount of material used and reducing the cost of dust suppression.

[0027] Based on similar reasons, in a preferred embodiment, the foam dust suppression material includes, by weight percentage: 0.015-0.02% of a foaming agent, 0.15-0.18% of a surfactant, 0.15-0.4% of a thickener, 0.2-0.3% of an inorganic salt and the remainder of a solvent. Under the above conditions, the foam dust suppression material can not only suppress dust more effectively, but also further enhance the adhesion and stability of the foam.

[0028] The inventor further optimized the types of surfactants, thickeners and solvents. In a preferred embodiment, the anionic surfactant includes one or more of sodium dodecylbenzene sulfonate, sodium dodecyl sulfate and sodium salt of dioctyl sulfosuccinate, the nonionic surfactant includes one or more of sodium fatty alcohol polyoxyethylene ether sulfonate, Triton X-100 and isooctyl alcohol polyoxyethylene ether; and / or, the thickener includes one or more of sodium carboxymethyl cellulose, sodium alginate and guar gum; and / or, the solvent includes water. Under the above conditions, the surfactant, thickener and solvent can cooperate with specific types of foaming agents and inorganic salts, the foam formation speed, stability and diffusivity are more suitable, and the dust suppression efficiency of the material is higher.

[0029] In a preferred embodiment, the foaming agent is a mixture of soy protein isolate and collagen, wherein the weight ratio of soy protein isolate and collagen is (5-8): (2-5); and / or, the surfactant is a mixture of sodium dodecylbenzene sulfonate and polyoxyethylene isooctyl alcohol ether, wherein the weight ratio of sodium dodecylbenzene sulfonate and polyoxyethylene isooctyl alcohol ether is (2-5): (3-6); and / or, the thickener is a mixture of sodium carboxymethyl cellulose, sodium alginate and guar gum, wherein the weight ratio of sodium carboxymethyl cellulose, sodium alginate and guar gum is (4-6): (7-9): (2-4); and / or, the inorganic salt is a mixture of potassium sulfate and magnesium chloride, wherein the weight ratio of potassium sulfate and magnesium chloride is (4-6): (1-3). Compounding the above ingredients can not only form a more durable and stable foam, but also improve the adhesion and dust suppression effect of the foam, and can more effectively reduce dust concentration and protect the environment and workers' health.

[0030] In a preferred embodiment, in the foam dust suppression material, the total volume of the foam is 400-800 mL; and / or, the half-life of the foam is 1440-1750 min; the dust reduction efficiency of the foam dust suppression material is ≥80%; and / or, the surface tension of the foam dust suppression material is 29-40 mN / m; and / or, the water contact angle of the foam dust suppression material is 27-40°. As mentioned above, by optimizing the components of the foam dust suppression material, the specific surface area, total volume, stability, half-life and expansion coefficient of the foam are effectively improved in this application. Accordingly, the dust reduction efficiency, surface tension and water contact angle of the dust suppression material are also significantly improved, and the water consumption is significantly reduced.

[0031] In another typical embodiment of the present invention, a method for preparing the above-mentioned foam dust suppression material is also provided, wherein a foaming agent, a surfactant, a thickener, an inorganic salt and a solvent are first mixed to obtain a foam dust suppression material. The preparation method of the present application is simple and easy to implement, and a foam dust suppression material with stable performance can be prepared by uniformly mixing the components.

[0032] By controlling the rotation speed, time and temperature during the mixing process, it is possible to ensure that the various components are mixed more fully and evenly to form a foam dust suppression material with excellent performance. In a preferred embodiment, the rotation speed of the first mixing is 50 to 100 rpm; and / or the time of the first mixing is 1 to 120 min. It should be noted that if the mixing speed is too fast, the solution may splash and produce bubbles, and it may not be able to reach a uniform state. If the speed is too slow, the mixing efficiency may be low and the solution may be stratified. If the mixing time is too long, it may cause the destruction of polymer aggregates and the breakage of molecular chains. If the mixing time is too short, it may cause uneven mixing. In addition, if the mixing temperature is too high, the protein may be inactivated. If the mixing temperature is too low, the modification reaction may be insufficient.

[0033] In a preferred embodiment, the foaming agent, surfactant, thickener and solvent are first mixed for a second time, then cooled, and an inorganic salt is added to perform a third mixing to obtain a foam dust suppression material. In the process of mixing the foaming agent, surfactant, thickener and solvent, the surfactant modifies the foaming agent so that the molecular chain of the foaming agent is fully unfolded to obtain a modified foaming liquid, and then an inorganic salt is added and a third mixing is performed. In this process, the addition of the inorganic salt improves the ionization characteristics of the mixture and prevents the stratification of the mixture to obtain a foam dust suppression material. Under the above conditions, the influence of the inorganic salt on the activity of the foaming agent at high temperature can be more effectively avoided, which is more conducive to improving the stability of the foam dust suppression material.

[0034] In order to further improve the stability and dust suppression effect of the foam dust suppression material, the inventors further optimized the parameters in the mixing process. In a preferred embodiment, the second mixing speed is 50-100 rpm, the time is 30-120 min, and the temperature is 40-60°C; and / or, the cooling end temperature is 20-30°C; and / or, the third mixing speed is 30-50 rpm, and the time is 1-30 min.

[0035] In another typical embodiment of the present invention, the application of the above-mentioned foam dust suppression material in the field of mining is also provided. The foam dust suppression material of the present application can not only effectively control dust in underground coal mines and open-pit mines, reduce pollution to the environment, and protect the health of workers, but also reduce the wear of dust on mechanical equipment through its good adhesion and stability, improve production efficiency, and reduce maintenance costs. In underground coal mines, the material can effectively prevent coal dust explosions and improve mine safety; in open-pit mines, it can reduce the impact of dust on surrounding residents and improve the community environment. In addition, the foam dust suppression material of the present application also has good biodegradability and is environmentally friendly, making it an ideal choice in the field of industrial dust control.

[0036] The present application is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in the present application.

[0037] Example 1

[0038] Calculated by weight percentage, the foam dust suppression material includes: 0.0175% of foaming agent (soy protein and collagen, the weight ratio of the two is 6:4), 0.17% of surfactant (sodium dodecylbenzene sulfonate), 0.275% of thickener (sodium alginate), 0.25% of inorganic salt (magnesium chloride) and the balance solvent (water).

[0039] First, the foaming agent, surfactant, thickener and solvent were stirred at 57 rpm and 53°C for 70 minutes, then cooled to 25°C, and then inorganic salt was added, and the mixture was stirred at 40 rpm and 25°C for 25 minutes to obtain a foam dust suppression material. The foam dust suppression material was used in coal mines.

[0040] Example 2

[0041] The only difference from Example 1 is:

[0042] In the foam dust suppression material, the type of foaming agent is soy protein isolate, the type of surfactant is sodium dodecylbenzene sulfonate, the type of thickener is sodium carboxymethyl cellulose, the type of inorganic salt is potassium sulfate, and the type of solvent is water.

[0043] Example 3

[0044] The only difference from Example 1 is:

[0045] In the foam dust suppression material, the type of foaming agent is collagen, the type of surfactant is isooctyl alcohol polyoxyethylene ether, the type of thickener is sodium alginate, the type of inorganic salt is magnesium chloride, and the type of solvent is water.

[0046] Example 4

[0047] The only difference from Example 1 is:

[0048] Calculated by weight percentage, the foam dust suppression material includes: 0.0175% of foaming agent (soy protein and collagen in a weight ratio of 5:5), 0.17% of surfactant (sodium dodecylbenzene sulfonate and isooctyl alcohol polyoxyethylene ether in a weight ratio of 2:6), 0.275% of thickener (sodium carboxymethyl cellulose, sodium alginate and guar gum in a weight ratio of 6:9:2), 0.25% of inorganic salt (potassium sulfate and magnesium chloride in a weight ratio of 4:3) and the remainder solvent (water).

[0049] Example 5

[0050] The only difference from Example 1 is:

[0051] Calculated by weight percentage, the foam dust suppression material includes: 0.0175% of foaming agent (soy protein and collagen in a weight ratio of 8:2), 0.17% of surfactant (sodium dodecylbenzene sulfonate and isooctyl alcohol polyoxyethylene ether in a weight ratio of 5:3), 0.275% of thickener (sodium carboxymethyl cellulose, sodium alginate and guar gum in a weight ratio of 4:7:4), 0.25% of inorganic salt (potassium sulfate and magnesium chloride in a weight ratio of 6:1) and the remainder solvent (water).

[0052] Example 6

[0053] The only difference from Example 1 is:

[0054] Calculated by weight percentage, the foam dust suppression material includes: 0.0175% of foaming agent, 0.175% of surfactant, 0.175% of thickener, 0.525% of inorganic salt and the balance solvent.

[0055] Example 7

[0056] The only difference from Example 1 is:

[0057] Calculated by weight percentage, the foam dust suppression material includes: 0.0175% of foaming agent, 0.875% of surfactant, 0.35% of thickener, 0.2625% of inorganic salt and the balance solvent.

[0058] Example 8

[0059] The only difference from Example 1 is:

[0060] Calculated by weight percentage, the foam dust suppression material includes: 0.015% of foaming agent, 0.18% of surfactant, 0.15% of thickener, 0.3% of inorganic salt and the balance solvent.

[0061] Example 9

[0062] The only difference from Example 1 is:

[0063] Calculated by weight percentage, the foam dust suppression material includes: 0.02% foaming agent, 0.15% surfactant, 0.4% thickener, 0.2% inorganic salt and the balance solvent.

[0064] Example 10

[0065] The only difference from Example 1 is:

[0066] First, the foaming agent, surfactant, thickener and solvent were stirred at 100 rpm and 40°C for 120 minutes, then cooled to 20°C, and then inorganic salt was added, and the mixture was stirred at 30 rpm for 30 minutes to obtain a foam dust suppression material. The foam dust suppression material was used in coal mines.

[0067] Embodiment 11

[0068] The only difference from Example 1 is:

[0069] First, the foaming agent, surfactant, thickener and solvent were stirred at 50 rpm and 60°C for 30 minutes, then cooled to 30°C, and then inorganic salt was added, and the mixture was stirred at 50 rpm for 1 minute to obtain a foam dust suppression material. The foam dust suppression material was used in open-pit mines.

[0070] Comparative Example 1

[0071] The only difference from Example 1 is:

[0072] The type of inorganic salt in foam dust suppression materials is calcium chloride.

[0073] Comparative Example 2

[0074] Embodiment 1 of Chinese patent application number 201510039458.2.

[0075] The characteristics and performance test results of the foam dust suppression materials prepared in the above examples and comparative examples are shown in Table 1.

[0076] Test method:

[0077] Foam specific surface area, total volume, stability, half-life, and expansion multiple tests: The tests were conducted at 25°C using a foam scanning analyzer (Teclis Scientific, Lyon, France);

[0078] Dust suppression efficiency of foam dust suppression materials: tested at 25°C using a simulated tunnel test platform;

[0079] Surface tension of foam dust suppression materials: tested at 25°C using an SDC-350 surface tension measuring instrument;

[0080] Contact angle of foam dust suppression material: tested at 25°C using SDC-350 contact angle measuring instrument;

[0081] Water consumption of foam dust suppression materials: tested at 25℃ using a self-developed foam generator.

[0082] Table 1

[0083]

[0084] Compared with the comparative example, in the embodiment, the synergistic effect of the active agent, foaming agent, inorganic salt and thickener, because of the modification mechanism of the active agent on the foaming agent, makes the complex molecular structure of the foaming agent stretch out, increases the foaming volume, and through the synergistic effect of the thickener and the inorganic salt on the foaming agent, the viscosity of the foaming agent is increased, the solubility is greatly improved, the ionization of the solution is enhanced, and the foam volume, viscosity, ionization and stability are improved.

[0085] It can be seen from the above that, compared with the comparative example, in the foam dust suppression materials of each embodiment of the present invention, the components cooperate with each other to effectively improve the foaming rate, foam stability and dust suppression effect of the dust suppression material, effectively suppress the diffusion of dust, and maintain the dust suppression effect for a long time. The foam dust suppression material of the present application is not only environmentally friendly and non-toxic to the human body, but also can protect the health of workers and improve the comfort of the working environment, and is low in cost and has good economic and social benefits.

[0086] In addition, it can be seen that when all process parameters are within the preferred range of the present invention, the foam dust suppression material has a better dust reduction effect, uses less water, has a higher foaming rate, is more environmentally friendly, and has a lower cost.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A foam dust suppression material, characterized in that: Includes foaming agents, surfactants, thickeners, inorganic salts and solvents; Wherein, the foaming agent includes soy protein isolate and / or collagen; The surfactant includes anionic surfactant and / or nonionic surfactant; The inorganic salt includes one or more of potassium sulfate, magnesium chloride, sodium sulfate and sodium chloride.

2. The foam dust suppression material according to claim 1, characterized in that: In the foam dust suppression material, The weight ratio of the foaming agent to the surfactant is 1:(10-50); and / or, The weight ratio of the foaming agent to the inorganic salt is 1:(15-30); and / or, The weight ratio of the foaming agent to the thickener is 1:(10-20).

3. The foam dust suppression material according to claim 1 or 2, characterized in that: Calculated by weight percentage, the foam dust suppression material includes: 0.015-0.02% of the foaming agent, 0.15-0.18% of the surfactant, 0.15-0.4% of the thickener, 0.2-0.3% of the inorganic salt and the balance of the solvent.

4. The foam dust suppression material according to any one of claims 1 to 3, characterized in that: The anionic surfactant includes one or more of sodium dodecylbenzene sulfonate, sodium dodecyl sulfate and sodium salt of dioctyl sulfonated succinate, and the nonionic surfactant includes one or more of sodium fatty alcohol polyoxyethylene ether sulfonate, Triton X-100 and isooctyl alcohol polyoxyethylene ether; and / or, The thickener includes one or more of sodium carboxymethyl cellulose, sodium alginate and guar gum.

5. The foam dust suppression material according to any one of claims 1 to 4, characterized in that: The foaming agent is a mixture of soy protein isolate and collagen, wherein the weight ratio of the soy protein isolate to the collagen is (5-8):(2-5); and / or, The surfactant is a mixture of sodium dodecylbenzene sulfonate and polyoxyethylene isooctyl alcohol ether, wherein the weight ratio of the sodium dodecylbenzene sulfonate to the polyoxyethylene isooctyl alcohol ether is (2-5):(3-6); and / or, The thickener is a mixture of sodium carboxymethyl cellulose, sodium alginate and guar gum, wherein the weight ratio of the sodium carboxymethyl cellulose, the sodium alginate and the guar gum is (4-6):(7-9):(2-4); and / or, The inorganic salt is a mixture of potassium sulfate and magnesium chloride, wherein the weight ratio of the potassium sulfate to the magnesium chloride is (4-6):(1-3).

6. The foam dust suppression material according to any one of claims 1 to 5, characterized in that: In the foam dust suppression material, The total volume of the foam is 400 to 800 mL; and / or, the half-life of the foam is 1440 to 1750 min; and / or, The dust reduction efficiency of the foam dust suppression material is ≥80%; and / or, the surface tension of the foam dust suppression material is 29-40 mN / m; and / or, the water contact angle of the foam dust suppression material is 27-40°.

7. The method for preparing the foam dust suppression material according to any one of claims 1 to 6, characterized in that: The foaming agent, the surfactant, the thickener, the inorganic salt and the solvent are first mixed to obtain the foam dust suppression material.

8. The preparation method according to claim 7, characterized in that: The foaming agent, the surfactant, the thickener and the solvent are firstly mixed for a second time, then cooled, and the inorganic salt is added thereto, followed by a third mixing to obtain the foam dust suppression material.

9. The preparation method according to claim 7 or 8, characterized in that: The second mixing is performed at a speed of 50 to 100 rpm, a time of 30 to 120 min, and a temperature of 40 to 60° C.; and / or, The cooling end point temperature is 20-30°C; and / or, The third mixing process has a rotation speed of 30 to 50 rpm and a time of 1 to 30 min.

10. Use of the foam dust suppression material according to any one of claims 1 to 6 in the field of mining.

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