Composite environment-friendly dust suppression composition and application thereof

Abstract

The invention relates to a composite environment-friendly dust suppression composition and application thereof, an agglomeration agent of the dust suppression composition rapidly forms a macromolecular substance with a certain net structure under the action of a cross-linking agent, various ionic groups and charged particles present relatively strong attraction force, dust particles can be captured and agglomerated, water molecules can be locked, and the dust suppression effect is good. Therefore, the effects of wetting and dust suppression are achieved. Meanwhile, the dust suppression composition forms a gel solution with stable thermodynamics under the condition that the content of water is low, the evaporation capacity of the water is low, and the action time of the dust suppression composition is prolonged. Besides, the agglomeration agent used in the invention is simple and easily available biomass, and the content of the agglomeration agent and water in the dust suppression composition is relatively large, so that the manufacturing cost of the dust suppression composition can be reduced, and the carrier, the equipment and the land cannot be damaged, thereby protecting the environment.

Description

Technical Field

[0001] The present disclosure relates to the field of coal dust suppression, and in particular, to a composite environmentally friendly dust suppression composition and uses thereof. Background Art

[0002] Coal is one of the three pillar energy sources in the world economy today, along with oil and natural gas. For a long time to come, the coal-based energy supply pattern will be difficult to change. In coal production, open-pit coal mining accounts for the main position. During the storage of open-pit coal in thermal power plants and during coal transportation, coal powder and smaller coal particles will form dust, which not only wastes resources, but also spreads to more distant areas with the wind; therefore, coal mine dust seriously harms the ecology of mining areas and the health of workers.

[0003] At present, in order to reduce dust, enterprises usually use water sprinkling or dust suppressant spraying to prevent coal dust from flying. Although water sprinkling can prevent coal dust from flying, due to the high hydrophobicity of coal and the rapid evaporation of water, the dust suppression time is short, which will not only cause a waste of water resources, but also result in poor dust suppression effect. Although the use of traditional dust suppressant technology is relatively mature, it can condense a solidified layer on the surface of coal and effectively consolidate coal dust for a long time, greatly saving manpower, material and financial resources, but dust suppressants contain a lot of chemical additives, which will damage metal vehicles, equipment and land, and are greatly limited in practical applications. Summary of the invention

[0004] The purpose of the present disclosure is to provide a composite environmentally friendly dust suppression composition and its use, so as to solve the problem in the prior art that it is impossible to simultaneously improve the dust suppression effect, the duration of the dust suppression effect and reduce the damage caused by the dust suppressant to vehicles, equipment and land.

[0005] In order to achieve the above-mentioned object, the first aspect of the present disclosure provides a composite environmentally friendly dust suppression composition, which comprises a coagulant, a surfactant, a thickener, a cross-linking agent and water; The agglomerating agent includes carboxymethyl cellulose, sulfonate and corn starch; Based on the total weight of the dust suppression composition, the content of the agglomerating agent is 40-70 weight %, the content of the surfactant is 1-10 weight %, the content of the thickener is 1-5 weight %, the content of the cross-linking agent is 1-5 weight %, and the content of water is 20-45 weight %.

[0006] Optionally, based on the total weight of the dust suppression composition, the content of the agglomerating agent is 45-60 weight %, the content of the surfactant is 4-6 weight %, the content of the thickener is 1.5-4 weight %, the content of the cross-linking agent is 2-4.5 weight %, and the content of water is 25-40 weight %.

[0007] Optionally, based on the total weight of the agglomerating agent, the content of the carboxymethyl cellulose is 30-94% by weight, the content of the sulfonate is 5-25% by weight, and the content of the corn starch is 1-25% by weight.

[0008] Optionally, based on the total weight of the agglomerating agent, the content of the carboxymethyl cellulose is 40-80% by weight, the content of the sulfonate is 10-20% by weight, and the content of the corn starch is 10-20% by weight.

[0009] Optionally, the surfactant includes a copolymer of polysiloxane and acrylic acid and / or a copolymer of polysiloxane and acrylate; the molecular weight of the copolymer in the surfactant is 300-400.

[0010] Optionally, the surfactant includes polydimethylsiloxane-b-polymethacrylic acid and polydimethylsiloxane-b-polymethyl methacrylate; Based on the total weight of the surfactant, the content of the polydimethylsiloxane-b-polymethacrylic acid is 60-70% by weight, and the content of the polydimethylsiloxane-b-polymethyl methacrylate is 30-40% by weight.

[0011] Optionally, the sulfonate comprises sodium sulfonate; the thickener comprises polyvinyl alcohol; and the cross-linking agent comprises sodium tetraborate.

[0012] Optionally, the weight ratio of the total weight of the agglomerating agent, the thickener and the cross-linking agent to the surfactant is (9-18):1.

[0013] Optionally, the weight ratio of the agglomerating agent to the water is (2-4):1.

[0014] The first aspect of the present invention discloses the use of the dust suppression composition in the process of coal storage and transportation.

[0015] Through the above technical scheme, the coagulant and the cross-linking agent quickly form a macromolecular substance with a certain network structure, and various ionic groups and charged particles show a strong attraction, which can not only capture and agglomerate dust particles, but also lock water molecules, thereby achieving the effect of wetting and dust suppression. Adding a surfactant to the dust suppression composition can improve the performance of the macromolecules with a network structure, thereby improving the dust suppression effect of the dust suppression composition. At the same time, the dust suppression composition forms a thermodynamically stable gel solution when the water content is low, and the evaporation of water is small, thereby improving the action time of the dust suppression composition. In addition, the coagulant used in the present invention is a simple and easily available biomass, and the content of the coagulant and water in the dust suppression composition accounts for a large proportion, which can not only reduce the manufacturing cost of the dust suppression composition, but also will not cause damage to vehicles, equipment and land, thereby protecting the environment.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0017] The specific embodiments of the present disclosure are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0018] The first aspect of the present disclosure provides a composite environmentally friendly dust suppression composition, which includes a coagulant, a surfactant, a thickener, a cross-linking agent and water; The agglomerating agent includes carboxymethyl cellulose, sulfonate and corn starch; Based on the total weight of the dust suppression composition, the content of the agglomerating agent is 40-70 weight %, the content of the surfactant is 1-10 weight %, the content of the thickener is 1-5 weight %, the content of the cross-linking agent is 1-5 weight %, and the content of water is 20-45 weight %.

[0019] Through the above technical scheme, the agglomerating agent, under the action of the cross-linking agent, quickly forms a macromolecular substance with a certain network structure, and various ionic groups and charged particles show a strong attraction, which can not only capture and agglomerate dust particles, but also lock water molecules, thereby achieving the effect of wetting and dust suppression. Adding a surfactant to the dust suppression composition can improve the performance of the macromolecules with a network structure, thereby improving the dust suppression effect of the dust suppression composition. At the same time, the dust suppression composition forms a thermodynamically stable gel solution when the water content is low, and the evaporation of water is small, thereby improving the action time of the dust suppression composition. In addition, the agglomerating agent used in the present disclosure is a simple and easily available biomass, and the content of the agglomerating agent and water in the dust suppression composition accounts for a large proportion, which can not only reduce the manufacturing cost of the dust suppression composition, but also will not cause damage to vehicles, equipment and land, thereby protecting the environment.

[0020] In a preferred embodiment, the agglomerating agent disclosed in the present invention is a composition of carboxymethyl cellulose, sulfonate and corn starch. In this embodiment, on the one hand, carboxymethyl cellulose, sulfonate and corn starch are all composed of biomass, and have the advantages of little pollution to the environment, low cost and easy availability. The use of the above composition as agglomerating agent can not only suppress the pollution of the dust composition to the environment, but also save costs. On the other hand, by using the above composition as agglomerating agent, through the configuration of components of different molecular weights in the process of forming a network structure, a network structure with developed pores and large pore volume can be formed, which can further improve the performance of water locking and dust suppression.

[0021] In one embodiment, the molecular formula of the carboxymethyl cellulose is C6H 12 O6, molecular weight is 180~181.

[0022] In one embodiment, the sulfonate, also known as sulfonated lignin, is a byproduct of sulfite papermaking wood pulp, is easily soluble in water and has good diffusivity, and can be used as a binder. The sulfonate in the sulfonate includes sodium sulfonate.

[0023] In one embodiment, the molecular weight of corn starch is 200,000 to 1,000,000. Selecting corn starch with a suitable molecular weight can not only ensure that it has good viscosity and stability after mixing with water, but also provide longer chains for the network structure.

[0024] In one embodiment, based on the total weight of the agglomerating agent, the content of the carboxymethyl cellulose is 30-94 weight %, the content of the sulfonate is 5-25 weight %, and the content of the corn starch is 1-25 weight %.

[0025] In a preferred embodiment, based on the total weight of the agglomerator, the content of the carboxymethyl cellulose is 40-80% by weight, the content of the sulfonate is 10-20% by weight, and the content of the corn starch is 10-20% by weight.

[0026] In this embodiment, the use of a suitable ratio of agglomerating agents can give full play to the characteristics of each component. By combining the short chain of carboxymethyl cellulose with the long chain of corn starch, macromolecules with a network structure with large porosity and pore volume can be obtained, which can further improve the water-locking and dust-suppressing properties.

[0027] In one embodiment, the surfactant described in the present disclosure includes a copolymer of polysiloxane and acrylic acid and / or a copolymer of polysiloxane and acrylate.

[0028] In a preferred embodiment, the surfactant includes polydimethylsiloxane-b-polymethacrylic acid and polydimethylsiloxane-b-polymethyl methacrylate.

[0029] In a further preferred embodiment, the content of the polydimethylsiloxane-b-polymethacrylic acid is 60-70% by weight, and the content of the polydimethylsiloxane-b-polymethyl methacrylate is 30-40% by weight. In this embodiment, the ratio between the components in the surfactant can be flexibly adjusted according to actual needs, for example, the content of the polydimethylsiloxane-b-polymethacrylic acid in the surfactant can be 60% by weight, 61% by weight, 62% by weight, 63% by weight, 64% by weight, 65% by weight, 66% by weight, 67% by weight, 68% by weight, 69% by weight and 70% by weight, or any two of the range; the content of the polydimethylsiloxane-b-polymethyl methacrylate in the surfactant can be 30% by weight, 31% by weight, 32% by weight, 33% by weight, 34% by weight, 35% by weight, 36% by weight, 37% by weight, 38% by weight, 39% by weight and 40% by weight, or any two of the range.

[0030] In one embodiment, the molecular weight of the copolymer in the surfactant is 300 to 400. In this embodiment, the two ends of the surfactant used in the present disclosure are respectively a hydrophilic end and a hydrophobic end, the hydrophilic end extends into the aqueous solution, and the hydrophobic end is connected to the agglomerating agent molecule. The use of two copolymers with different hydrophobic ends can be combined with different substances of the formed network structure macromolecules, further improving the surface activity of the formed network structure macromolecules. The molecular weight of the copolymer in the surfactant can be flexibly set according to the properties of the formed network structure macromolecules, for example, the molecular weight of the copolymer in the surfactant is 310, 330, 350, 380 or any range between two.

[0031] In one embodiment, the thickener includes one or more of polyvinyl alcohol, carboxymethyl cellulose, alginic acid, and propylene glycol ester, preferably carboxymethyl cellulose.

[0032] In one embodiment, the crosslinking agent includes one or more of sodium tetraborate, trimethylolpropane, methacrylic acid, and HPMA, preferably methacrylic acid.

[0033] In the above embodiment, when the components in the dust suppression composition are fully mixed, the component mixture of the surfactant and the coagulant, thickener, and crosslinker is fully compatible in the water body, and the aqueous mixture is a homogeneous system. In the process of the component mixture of the surfactant and the coagulant, thickener, and crosslinker being fully dissolved in the water body, it begins to separate into two layers, one layer mainly containing the surfactant, and the other layer mainly containing the component mixture of the coagulant, thickener, and crosslinker. Due to the repulsion of the same charge, the diffuse double layers of the component mixture coils of the surfactant and the coagulant, thickener, and crosslinker maintain a mutually repulsive zone, becoming a thermodynamically stable solution. When fully mixed, due to the compression of the double layer, the surfactants approach each other, the double layers overlap, the polymer coils tend to curl up, the repulsive zone between the surfactant and the combined mixture molecules decreases, and a dense two-dimensional separation trend begins to occur; and when the electrolyte concentration increases to a certain value, it separates into two obvious phases.

[0034] In one embodiment, the water used in the present disclosure is deionized water.

[0035] In a preferred embodiment, the deionized water is of EWII grade.

[0036] In a preferred embodiment, based on the total weight of the dust suppression composition, the content of the agglomerating agent is 45-60 weight %, the content of the surfactant is 4-6 weight %, the content of the thickener is 1.5-4 weight %, the content of the cross-linking agent is 2-4.5 weight %, and the content of water is 25-40 weight %.

[0037] In this embodiment, when the content of each component in the dust suppression composition is at an appropriate content, the synergistic effect of the components in the dust suppression composition can be enhanced, thereby enhancing the mutual cross-linking effect between high molecular polymers, quickly forming a certain network structure, and various ionic groups and charged particles show a strong attraction, which captures and agglomerates dust particles and fixes them in the high molecular network structure, thereby achieving the effect of wetting and dust suppression.

[0038] In one embodiment, the weight ratio of the agglomerating agent to the crosslinking agent is (12.0-15.0): 1. In this embodiment, the use of a suitable amount of the crosslinking agent and the agglomerating agent can increase the strength of the large grid structure molecules formed, thereby improving the dust suppression effect and action time of the dust suppression composition.

[0039] In one embodiment, the weight ratio of the total weight of the agglomerating agent, the thickener and the cross-linking agent to the surfactant is (9-18):1.

[0040] In a preferred embodiment, the weight ratio of the total weight of the agglomerating agent, the thickener and the cross-linking agent to the surfactant is (10-16.5):1.

[0041] In this embodiment, the weight ratio of the total weight of the coagulant, the thickener and the cross-linking agent to the surfactant can be flexibly adjusted according to actual needs. For example, the weight ratio can be one of 10.0:1, 12.0:1, 14.0:1, 15.0:1 or a range between any two of them.

[0042] In one embodiment, the weight ratio of the agglomerating agent to the water is (1.5-4):1.

[0043] In a preferred embodiment, the weight ratio of the agglomerating agent to the water is (2-3.5):1.

[0044] In this embodiment, when the amount of agglomerating agent and water added to the dust suppression composition is within a suitable range, each component forms a gelled solution in water, and the fluidity of the gelled solution is good, which can meet the purpose of moving in each spraying pipeline; for example, the viscosity of the obtained dust suppression composition is in the range of one or any two of 2.0CPS, 2.5CPS, 3.0CPS, 3.5CPS and 4.0CPS. In addition, the amount of water added is less than that in the traditional method. When the dust suppression composition is sprayed on the surface of the coal, part of the water is adsorbed in the pores of the macro-network structure molecules. This type of water is not easy to volatilize and evaporate, thereby reducing the amount of water used and the loss rate, and can increase the duration of the dust suppression effect. In order to further improve the performance of the dust suppression composition, the weight ratio of the agglomerating agent to the water can be further limited. For example, the weight ratio of the agglomerating agent to the water is 1.7:1, 1.9:1, 2.1:1, 2.3:1, 2.5:1, 2.7:1, 2.9:1, 3.1:1, 3.3:1, 3.5:1, 3.7:1 and 3.9:1, or a range between any two of them.

[0045] In one embodiment, the method for preparing a dust suppression composition comprises: adding a coagulant, a surfactant, a thickener and a crosslinking agent to water and mixing and stirring to obtain the dust suppression composition. There is no special requirement for the order of adding the coagulant, the surfactant, the thickener and the crosslinking agent, and it is only necessary to ensure that the composition and content of the dust suppression composition meet the following requirements: based on the total weight of the dust suppression composition, the content of the coagulant is 40-70% by weight, the content of the surfactant is 1-10% by weight, the content of the thickener is 1-5% by weight, the content of the crosslinking agent is 1-5% by weight, and the content of water is 20-45% by weight.

[0046] The first aspect of the present invention discloses the use of the dust suppression composition in the process of coal storage and transportation.

[0047] In one embodiment, the dust suppression composition of the present invention is specifically used as follows during actual use: 1) Prepare the solution according to the composition and specific ratio of the dust suppression composition.

[0048] 2) Slowly open the water inlet flow regulating valve of the dust suppression composition dosing device. When the water level reaches 80%, start the mixer and stir continuously for 10 minutes to mix the reagents in the above formula until they are uniform.

[0049] 3) Open the water outlet regulating valve in the dust suppression composition dosing device, start the metering pump, and transport it to each spraying position in the coal yard through the water outlet pipeline.

[0050] 4) When the liquid level in the dust suppression composition adding device is lower than 20%, continue to add the dust suppression composition to the device.

[0051] The present disclosure is further illustrated by examples below, but the present disclosure is not limited thereto. Unless otherwise specified, the chemicals used in the following examples and comparative examples are all commercially available products with a purity of more than 99% by weight, wherein the chemicals include carboxymethyl cellulose, sodium sulfonate, corn starch, polydimethylsiloxane-b-polymethacrylic acid, polydimethylsiloxane-b-polymethyl methacrylate, polyvinyl alcohol, and sodium tetraborate.

[0052] Example 1 The method for preparing the dust suppression composition S1 comprises: adding 40g of carboxymethyl cellulose, 10g of sodium sulfonate, 10g of corn starch, 4g of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306), 4g of polyvinyl alcohol and 2g of sodium tetraborate into 30g of secondary deionized water, mixing and stirring to obtain the dust suppression composition S1; Based on the total weight of the dust suppression composition S1, the content of the agglomerating agent is 60 wt % (66.67 wt % of carboxymethyl cellulose, 16.67 wt % of sodium sulfonate, 16.67 wt % of corn starch), the content of the surfactant is 4 wt %, the content of the thickener is 4 wt %, the content of the cross-linking agent is 2 wt %, and the content of water is 30 wt %.

[0053] Example 2 The method for preparing the dust suppression composition S2 comprises: adding 45 g of carboxymethyl cellulose, 15 g of sodium sulfonate, 5 g of corn starch, 4 g of a mixture of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306) and 2 g of polydimethylsiloxane-b-polymethyl methacrylate (molecular weight 306), 4 g of polyvinyl alcohol and 5 g of sodium tetraborate into 20 g of secondary deionized water, mixing and stirring to obtain the dust suppression composition S2; Based on the total weight of the dust suppression composition S2, the content of the agglomerating agent is 65 wt% (69.23 wt% of carboxymethyl cellulose, 23.08 wt% of sodium sulfonate, and 7.70 wt% of corn starch), the content of the surfactant (66.67 wt% of polydimethylsiloxane-b-polymethacrylic acid and 33.33 wt% of polydimethylsiloxane-b-polymethyl methacrylate) is 6 wt%, the content of the thickener is 4 wt%, the content of the crosslinking agent is 5 wt%, and the content of water is 20 wt%.

[0054] Example 3 The method for preparing the dust suppression composition S3 comprises: adding 40 g of carboxymethyl cellulose, 13 g of sodium sulfonate, 10 g of corn starch, 6 g of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306), 4 g of polyvinyl alcohol and 4 g of sodium tetraborate into 23 g of secondary deionized water, mixing and stirring to obtain the dust suppression composition S3; Based on the total weight of the dust suppression composition S3, the content of the agglomerating agent is 63 wt % (63.5 wt % of carboxymethyl cellulose, 20.63 wt % of sodium sulfonate, 15.87 wt % of corn starch), the content of the surfactant is 6 wt %, the content of the thickener is 4 wt %, the content of the cross-linking agent is 4 wt %, and the content of water is 23 wt %.

[0055] Example 4 The method for preparing the dust suppression composition S4 comprises: adding 45 g of carboxymethyl cellulose, 10 g of sodium sulfonate, 10 g of corn starch, 4.5 g of a mixture of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306) and 2.5 g of polydimethylsiloxane-b-polymethyl methacrylate (molecular weight 306), 5 g of polyvinyl alcohol and 2 g of sodium tetraborate into 21 g of secondary deionized water, mixing and stirring to obtain the dust suppression composition S4; Based on the total weight of the dust suppression composition S4, the content of the agglomerating agent is 65 wt% (69.23 wt% of carboxymethyl cellulose, 15.38 wt% of sodium sulfonate, and 15.38 wt% of corn starch), the content of the surfactant (64.29 wt% of polydimethylsiloxane-b-polymethacrylic acid and 35.71 wt% of polydimethylsiloxane-b-polymethyl methacrylate) is 7 wt%, the content of the thickener is 5 wt%, the content of the crosslinking agent is 2 wt%, and the content of water is 25 wt%.

[0056] Example 5 The method for preparing the dust suppression composition S5 comprises: adding 12 g of carboxymethyl cellulose, 10 g of sodium sulfonate, 38 g of corn starch, 4 g of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306), 4 g of polyvinyl alcohol and 2 g of sodium tetraborate into 30 g of secondary deionized water and mixing and stirring to obtain the dust suppression composition S5; Based on the total weight of the dust suppression composition S5, the content of the agglomerating agent is 60 wt % (20 wt % of carboxymethyl cellulose, 16.67 wt % of sodium sulfonate, 63.33 wt % of corn starch), the content of the surfactant is 4 wt %, the content of the thickener is 4 wt %, the content of the cross-linking agent is 2 wt %, and the content of water is 30 wt %.

[0057] Example 6 The method for preparing the dust suppression composition S6 comprises: adding 40 g of carboxymethyl cellulose, 15 g of sodium sulfonate, 10 g of corn starch, 3 g of a mixture of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306) and 3 g of polydimethylsiloxane-b-polymethyl methacrylate (molecular weight 306), 4 g of polyvinyl alcohol and 5 g of sodium tetraborate into 20 g of secondary deionized water, mixing and stirring to obtain the dust suppression composition S6; Based on the total weight of the dust suppression composition S6, the content of the agglomerating agent is 65 wt% (61.54 wt% of carboxymethyl cellulose, 23.08 wt% of sodium sulfonate, and 15.38 wt% of corn starch), the content of the surfactant (50 wt% of polydimethylsiloxane-b-polymethacrylic acid and 50 wt% of polydimethylsiloxane-b-polymethyl methacrylate) is 6 wt%, the content of the thickener is 4 wt%, the content of the crosslinking agent is 5 wt%, and the content of water is 20 wt%.

[0058] Example 7 The method for preparing the dust suppression composition S7 comprises: adding 40 g of carboxymethyl cellulose, 10 g of sodium sulfonate, 10 g of corn starch, 8 g of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306), 2 g of polyvinyl alcohol and 2 g of sodium tetraborate into 28 g of secondary deionized water and mixing and stirring to obtain the dust suppression composition S7; Based on the total weight of the dust suppression composition S7, the content of the agglomerating agent is 60 wt % (66.67 wt % of carboxymethyl cellulose, 16.67 wt % of sodium sulfonate, 16.66 wt % of corn starch), the content of the surfactant is 8 wt %, the content of the thickener is 2 wt %, the content of the cross-linking agent is 2 wt %, and the content of water is 28 wt %.

[0059] Example 8 The method for preparing the dust suppression composition S8 comprises: adding 38 g of carboxymethyl cellulose, 6 g of sodium sulfonate, 6 g of corn starch, 4 g of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306), 4 g of polyvinyl alcohol and 2 g of sodium tetraborate into 40 g of secondary deionized water, mixing and stirring to obtain the dust suppression composition S8; Based on the total weight of the dust suppression composition S8, the content of the agglomerating agent is 50 wt% (76 wt% of carboxymethyl cellulose, 12 wt% of sodium sulfonate, 12 wt% of corn starch), the content of the surfactant is 4 wt%, the content of the thickener is 4 wt%, the content of the cross-linking agent is 2 wt%, and the content of water is 40 wt%.

[0060] Example 9 The method for preparing the dust suppression composition S9 is the same as that of Example 1, except that the molecular weight of the polydimethylsiloxane-b-polymethacrylic acid is 500.

[0061] Comparative Example 1 5 g of sodium lignin sulfonate, 0.5 g of calcium chloride, 5 g of acrylamide and 0.8 g of N,N methylene acrylamide were weighed separately and dissolved in 100 ml of water, and reacted at a constant temperature of 50°C for 2 hours. Then, 10 ml of acrylic acid and 0.06 g of ammonium persulfate were added, and the reaction was carried out at a constant temperature of 80°C for 3 hours to obtain a gel-like substance. The gel-like substance was chopped, and 0.8 ml of sodium secondary alkyl sulfonate, 0.3 ml of hydroxyethyl cellulose, 0.3 ml of castor oil polyoxyethylene ether sulfonate; 0.4 ml of fatty alcohol polyoxyethylene ether; and 0.3 ml of monododecyl potassium phosphate were added and mixed and stirred. The obtained substance was mixed with water in a mass ratio of 1:50, and the pH value was adjusted to 9 to obtain a dust suppression composition D1.

[0062] Comparative Example 2 The method for preparing the dust suppression composition D2 comprises: adding 60 g of carboxymethyl cellulose, 4 g of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306), 4 g of polyvinyl alcohol and 2 g of sodium tetraborate into 30 g of secondary deionized water, mixing and stirring to obtain the dust suppression composition D2; Based on the total weight of the dust suppression composition D2, the content of the agglomerating agent is 60 wt %, the content of the surfactant is 4 wt %, the content of the thickener is 4 wt %, the content of the crosslinking agent is 2 wt %, and the content of water is 30 wt %.

[0063] Comparative Example 3 The method for preparing the dust suppression composition D3 comprises: adding 60 g of sodium sulfonate, 4 g of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306), 4 g of polyvinyl alcohol and 2 g of sodium tetraborate into 30 g of secondary deionized water and mixing and stirring to obtain the dust suppression composition D3; Based on the total weight of the dust suppression composition D3, the content of the agglomerating agent is 60 wt %, the content of the surfactant is 4 wt %, the content of the thickener is 4 wt %, the content of the crosslinking agent is 2 wt %, and the content of water is 30 wt %.

[0064] Comparative Example 4 The method for preparing the dust suppression composition D4 comprises: adding 60g corn starch, 4g polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306), 4g polyvinyl alcohol and 2g sodium tetraborate into 30g secondary deionized water and mixing and stirring to obtain the dust suppression composition D4; Based on the total weight of the dust suppression composition D4, the content of the agglomerating agent is 60 wt %, the content of the surfactant is 4 wt %, the content of the thickener is 4 wt %, the content of the crosslinking agent is 2 wt %, and the content of water is 30 wt %.

[0065] Comparative Example 5 The method for preparing the dust suppression composition D5 comprises: adding 21 g of carboxymethyl cellulose, 7 g of sodium sulfonate, 7 g of corn starch, 15 g of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306), 10 g of polyvinyl alcohol and 10 g of sodium tetraborate into 30 g of secondary deionized water and mixing and stirring to obtain the dust suppression composition D5; Based on the total weight of the dust suppression composition D5, the content of the agglomerating agent is 35 wt %, the content of the surfactant is 15 wt %, the content of the thickener is 10 wt %, the content of the crosslinking agent is 10 wt %, and the content of water is 30 wt %.

[0066] Test Case 100g of dust suppression compositions S1-S9 obtained in Examples 1-9, dust suppression compositions D1-D5 obtained in Comparative Examples 1-5, and water were sprayed on the surface of 100g of coal samples of the same nature, and the sprayed coal samples were purged with a hair dryer at 25°C and a wind speed of 6.5m / s, and the weight of the remaining materials was measured. The purging time of the hair dryer was 1h, 2h, 5h, 10h, 15h and 20h respectively; the coal samples were mined from the Qipanjing Coal Mine; the coal sample loss rate was calculated by the following formula: coal sample loss rate = (weight of the original coal sample - weight of the coal sample after purging) / weight of the original coal sample. The measurement results are shown in Table 1.

[0067] Table 1 Measurement results of embodiments and comparative examples

[0068] As shown in Table 1, according to the data in Examples 1 to 9 and Comparative Examples 1 to 6, the agglomerating agent quickly forms a macromolecular substance with a certain network structure under the action of the cross-linking agent, and various ionic groups and charged particles show a strong attraction, which can not only capture and agglomerate dust particles, but also lock water molecules, thereby achieving the effect of wetting and dust suppression. Adding a surfactant to the dust suppression composition can improve the performance of the macromolecules of the network structure, thereby improving the dust suppression effect of the dust suppression composition. At the same time, the dust suppression composition forms a thermodynamically stable gel solution when the water content is low, and the evaporation of water is small, which improves the action time of the dust suppression composition. In addition, the agglomerating agent used in the present disclosure is a simple and easily available biomass, and the content of the agglomerating agent and water in the dust suppression composition accounts for a large proportion, which can not only reduce the manufacturing cost of the dust suppression composition, but also will not cause damage to the vehicle, equipment and land, thereby protecting the environment. According to the data in Example 1 and Example 4, when the content of each component in the dust suppression composition is within a preferred range, the dust suppression effect can be improved. According to the comparison of the data in Example 1 and Example 5, when the content of each component of the agglomerating agent is within the preferred range, the dust suppression effect can be improved. According to the comparison of the data in Example 2 and Example 6, when the content of each component of the surfactant is within the appropriate range, the dust suppression effect can be improved. According to the comparison of the data in Example 1 and Example 7, when the weight ratio of the total weight of the agglomerating agent, the thickener and the cross-linking agent to the surfactant is (9~18):1, the dust suppression effect can be improved. According to the comparison of the data in Example 1 and Example 8, when the weight ratio of the agglomerating agent to the water is (2~4):1, the dust suppression effect can be improved. According to the comparison of the data in Example 1 and Example 9, when the molecular weight of the copolymer in the surfactant is 300~400, the dust suppression effect can be improved.

[0069] The preferred embodiments of the present disclosure are described in detail above; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0070] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0071] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A composite environmentally friendly dust suppression composition, characterized in that: The dust suppression composition comprises an agglomerating agent, a surfactant, a thickener, a cross-linking agent and water; The agglomerating agent includes carboxymethyl cellulose, sulfonate and corn starch; Based on the total weight of the dust suppression composition, the content of the agglomerating agent is 40-70 weight %, the content of the surfactant is 1-10 weight %, the content of the thickener is 1-5 weight %, the content of the cross-linking agent is 1-5 weight %, and the content of water is 20-45 weight %.

2. The dust suppression composition according to claim 1, characterized in that Based on the total weight of the dust suppression composition, the content of the agglomerating agent is 45-60 weight %, the content of the surfactant is 4-6 weight %, the content of the thickener is 1.5-4 weight %, the content of the cross-linking agent is 2-4.5 weight %, and the content of water is 25-40 weight %.

3. The dust suppression composition according to claim 1, characterized in that Based on the total weight of the agglomerating agent, the content of the carboxymethyl cellulose is 30-94 weight %, the content of the sulfonate is 5-25 weight %, and the content of the corn starch is 1-25 weight %.

4. The dust suppression composition according to claim 1, characterized in that Based on the total weight of the agglomerating agent, the content of the carboxymethyl cellulose is 40-80% by weight, the content of the sulfonate is 10-20% by weight, and the content of the corn starch is 10-20% by weight.

5. The dust suppression composition according to claim 1, characterized in that The surfactant includes a copolymer of polysiloxane and acrylic acid and / or a copolymer of polysiloxane and acrylate; The molecular weight of the copolymer in the surfactant is 300-400.

6. The dust suppression composition according to claim 4, characterized in that The surfactant includes polydimethylsiloxane-b-polymethacrylic acid and polydimethylsiloxane-b-polymethyl methacrylate; Based on the total weight of the surfactant, the content of the polydimethylsiloxane-b-polymethacrylic acid is 60-70% by weight, and the content of the polydimethylsiloxane-b-polymethyl methacrylate is 30-40% by weight.

7. The dust suppression composition according to claim 1, characterized in that The sulfonate includes sodium sulfonate; The thickener includes polyvinyl alcohol; The cross-linking agent includes sodium tetraborate.

8. The dust suppression composition according to claim 1, characterized in that The weight ratio of the total weight of the agglomerating agent, the thickener and the cross-linking agent to the weight of the surfactant is (9-18):

1.

9. The dust suppression composition according to claim 1, characterized in that The weight ratio of the agglomerating agent to the water is (1.5-4):

1.

10. Use of the dust suppression composition according to any one of claims 1 to 9 in the process of coal storage and transportation.

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