Dust suppressant and dust suppression method using the same

Abstract

The dust suppressant according to an embodiment of the present invention comprises 10 to 60 wt % of anionic surfactant, 1 to 30 wt % of nonionic surfactant, 10 to 30 wt % of glycol ether and 20 to 50 wt % of solvent.

Description

Technical Field

[0001] One embodiment of the present invention relates to a dust suppressant and a dust suppression method using the same. Specifically, one embodiment of the present invention relates to a multi-purpose coal dust suppressant and a dust suppression method using the same, the multi-purpose coal dust suppressant being used to absorb dust scattered during coal loading and unloading operations through a bucket, and suppress further dust generation during transportation using a hopper and a conveyor belt system, etc., while digesting the natural oxidation of coal through a cooling effect. Background Art

[0002] Coal, being a porous material, generally generates dust during loading, unloading and transportation operations.

[0003] In addition, during the loading, unloading and transportation process, coal absorbs oxygen from the air, generating natural oxidation, where oxygen and volatile components react to generate heat. Since the smaller the coal particle size, the larger the surface area of ​​the coal, the larger the contact area between the coal and oxygen, so dust promotes natural oxidation. Due to this natural oxidation phenomenon, volatile components are volatilized and harmful gases produce bad odors.

[0004] The actual coal-using units will store coal after loading, unloading and transportation operations. At this time, the primary factor is to absorb the dust scattered during loading and unloading operations through the bucket by forming bubbles. This is the main function of the bubble-type anti-scattering agent.

[0005] However, bubble-type anti-scattering agents reduce the amount of scattered dust by absorbing the scattered dust by maximizing the surface area relative to water, but they cannot suppress further dust generation due to insufficient permeability during transportation to the storage site through the hopper and conveyor system after the bucket operation, nor can they suppress the generation of harmful gases due to the natural oxidation phenomenon of volatile components. Therefore, the second important factor is to have permeability so that the bubbles that absorb dust can quickly return to liquid and quickly penetrate into the coal to suppress further dust generation, and digest the natural oxidation through cooling, thereby suppressing the generation of harmful gases.

[0006] Recently, the import of low-priced coal with a high pulverized coal ratio has been increasing, and environmental regulations on scattered dust have been strengthened. Therefore, there is an urgent need to develop a dust suppressant that can fundamentally suppress the dust generated during loading, unloading and transportation operations.

[0007] Therefore, the need for a multi-purpose dust suppressant that absorbs dust scattered during loading and unloading operations through a bucket and quickly turns it into a liquid state, which then penetrates into the coal to suppress further dust generation, is becoming more and more apparent. At the same time, the technology to reduce odor by suppressing volatile harmful gases generated by natural oxidation during loading and unloading and transportation operations is also a technology that actual coal users must possess in terms of managing coal before use.

[0008] As a dust suppressant, a bubble type anti-scattering agent is known, which prevents the scattering of dust by using polyvinyl alcohol and a surfactant.

[0009] This anti-scattering method forms a film by mixing polyvinyl alcohol, surfactants and additives (hexanediol) as the main raw materials with water and spraying them in the form of bubbles. The film solidifies the coal surface to suppress dust. However, this method only maximizes the coating area and reduces the usage by generating bubbles, and it does not fundamentally consider the dust adsorption function of bubbles.

[0010] This anti-scattering method is not a countermeasure for dust generated during transportation operations, but only solidifies the surface of coal piled in the open air to suppress the generation of dust. Summary of the invention

[0011] Technical issues

[0012] An object of one embodiment of the present invention is to provide a dust suppressant and a dust suppression method using the same. Specifically, an object of one embodiment of the present invention is to provide a multi-purpose coal dust suppressant and a dust suppression method using the same, the multi-purpose coal dust suppressant being used to absorb dust scattered during coal loading and unloading operations through a bucket, and suppress further dust generation during transportation using a hopper and a conveyor belt system, etc., while digesting the natural oxidation of coal through a cooling effect.

[0013] Technical means

[0014] The dust suppressant according to an embodiment of the present invention comprises 10 to 60 wt % of anionic surfactant, 1 to 30 wt % of nonionic surfactant, 10 to 30 wt % of glycol ether and 20 to 50 wt % of solvent.

[0015] The dust suppressant according to an embodiment of the present invention may further include 0.1 to 10 wt % of a foam stabilizer.

[0016] The anionic surfactant may include at least one selected from sodium 2-ethylhexyl sulfonate, sodium hexyl sulfonate, sodium octyl sulfonate, sodium dioctyl sulfosuccinate, ammonium 2-ethylhexyl sulfonate, ammonium hexyl sulfonate, ammonium octyl sulfonate, and dioctyl ammonium sulfosuccinate.

[0017] The nonionic surfactant may include at least one selected from polyoxyethylene alkyl ethers, polyoxyethylene alkenyl ethers, and polyoxyethylene alkylphenyl ethers.

[0018] The glycol ether may include at least one selected from diethylene glycol diethyl ether, diethylene glycol dibutyl ether, dipropylene glycol dimethyl ether, dipropylene glycol dibutyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, triethylene glycol dibutyl ether, ethylene glycol methyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, diethylene glycol monobutyl ether and dipropylene glycol.

[0019] The dust suppression method according to an embodiment of the present invention sprays the dust suppressant in the form of a foam concentrate together with water by water pressure, thereby spraying the dust suppressant toward the coal in the form of bubbles (Foaming).

[0020] The dust suppressant may be sprayed at a ratio of 1 to 5% by weight to the water of 95 to 99% by weight.

[0021] Beneficial Effects

[0022] According to an embodiment of the present invention, a small amount of dust suppressant can be used to form bubbles to absorb the scattered dust only by water pressure without pump power.

[0023] Furthermore, the bubbles that adsorb dust are converted into liquid and penetrate into the coal, thereby helping to suppress further dust generation.

[0024] Furthermore, since dust suppressants quickly penetrate the coal and, through their cooling action, digest the natural oxidation of volatile components, they help reduce odors during transportation operations.

[0025] Moreover, since it is possible to suppress the flying dust of coal and suppress further dust generation while reducing the odor caused by natural oxidation, it is possible to use low-priced coal with a high proportion of pulverized coal without causing environmental problems, thereby enabling coal to be purchased economically and managed in a safe and environmentally friendly manner. DETAILED DESCRIPTION

[0026] The technical terms used herein are provided only for reference to specific embodiments and are not intended to limit the present invention. Unless clearly indicated to the contrary, the singular form of the expression used herein also includes the plural form of the expression. The meaning of "comprising" used in the specification is used to concretize specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0027] When a part is said to be "above" or "on the upper side" of another part, this means that the part may be directly above or on the upper side of the other part, or may mean that there is another part between the two. On the other hand, when a part is said to be "directly above" another part, this means that there is no other part between the two.

[0028] Although not defined differently, all terms used herein, including technical and scientific terms, have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. Terms defined in commonly used dictionaries are further interpreted as meanings consistent with relevant technical documents and current disclosures, and are not interpreted as ideal or very formal meanings unless otherwise defined.

[0029] In addition, unless otherwise specified, % means weight %, and 1 ppm means 0.0001 weight %.

[0030] In one embodiment of the present invention, the phrase "the composition further includes an additional element" means that the additional element replaces the remaining element, and the replaced amount of the remaining element is equal to the added amount of the additional element.

[0031] The following is a detailed description of the embodiments of the present invention so that those skilled in the art can easily implement the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0032] The dust suppressant of one embodiment of the present invention comprises 10 to 60% by weight of anionic surfactant, 1 to 30% by weight of nonionic surfactant, 10 to 30% by weight of glycol ether and 20 to 50% by weight of solvent. The dust suppressant of one embodiment of the present invention has the aforementioned composition and ratio, and the carbon group of the hydrophobic part is adsorbed to the coal surface, and the hydrophilic part and the glycol group pull the water molecules, thereby reducing the surface tension of the coal surface. This will increase the adsorption capacity of coal and water, so that the coal is quickly impregnated with water, increase the weight of micro-coal molecules, and inhibit further dust generation. Moreover, for the further dust suppression achieved by the permeability, even after the water evaporates, a unique condensation phenomenon (caking) will remain, thereby inhibiting the generation of dust within a certain period of time.

[0033] Below, each component is described in detail.

[0034] The dust suppressant comprises 10 to 60% by weight of anionic surfactant.

[0035] The anionic surfactant improves permeability together with the nonionic surfactant. When too little anionic surfactant is included, appropriate permeability and bubble properties of the dust suppressant cannot be ensured. When too much anionic surfactant is included, the dust adsorption of the dust suppressant decreases. More specifically, 20 to 40% by weight of the anionic surfactant may be included.

[0036] The anionic surfactant may include one or more selected from the group consisting of sodium 2-ethylhexyl sulfonate, sodium hexyl sulfonate, sodium octyl sulfonate, sodium dioctyl sulfosuccinate, ammonium 2-ethylhexyl sulfonate, ammonium hexyl sulfonate, ammonium octyl sulfonate, and ammonium dioctyl sulfosuccinate. More specifically, it may include sodium dioctyl sulfosuccinate.

[0037] The dust suppressant includes 1 to 30% by weight of a nonionic surfactant. The nonionic surfactant improves permeability together with the anionic surfactant. When too little nonionic surfactant is included, appropriate permeability of the dust suppressant cannot be ensured. When too much nonionic surfactant is included, the dust adsorption of the dust suppressant decreases. More specifically, 5 to 15% by weight of a nonionic surfactant may be included.

[0038] The nonionic surfactant may include one or more selected from the group consisting of polyoxyethylene alkyl ether, polyoxyethylene alkenyl ether and polyoxyethylene alkylphenyl ether. More specifically, it may include polyoxyethylene alkyl ether.

[0039] The dust suppressant includes 10 to 30% by weight of glycol ether. The glycol ether plays a role in reducing viscosity, improving the bonding force between the components of the composition, extending the usable period, and improving the moisture drying efficiency. When too little glycol ether is included, the aforementioned effects cannot be properly played. When too much glycol ether is included, problems may occur when bubbles are formed. More specifically, 15 to 25% by weight of glycol ether may be included.

[0040] The glycol ether may include at least one selected from diethylene glycol diethyl ether, diethylene glycol dibutyl ether, dipropylene glycol dimethyl ether, dipropylene glycol dibutyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, triethylene glycol dibutyl ether, ethylene glycol methyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, diethylene glycol monobutyl ether and dipropylene glycol. More specifically, diethylene glycol monobutyl ether may be included.

[0041] In addition to the glycol ether, a glycol compound may be further included. Specifically, one or more of propylene glycol and butyl diglycol may be further included. When these compounds are further included, 1 to 10% by weight of these compounds may be further included based on their total weight.

[0042] The dust suppressant includes 20 to 50% by weight of a solvent. By including the solvent, a dust suppressant having excellent water solubility and dispersibility can be stably composed.

[0043] In addition to the aforementioned components, the dust suppressant may further include 0.1 to 10% by weight of a foam stabilizer. Examples of the foam stabilizer may be one or more selected from glycerin, glyceryl glucoside, polyoxyethylene methyl glucose, betaine-based amphoteric surfactants, and alkyl alcohol. By adding the foam stabilizer, bubbles can be formed more stably.

[0044] The dust suppression method according to an embodiment of the present invention sprays the dust suppressant in the form of a foam concentrate together with water by water pressure, thereby spraying the dust suppressant toward the coal in the form of bubbles (Foaming).

[0045] The so-called foam stock solution form refers to a water-soluble functional agent (product) that generates foam (bubbles) by mixing with water. The bubble form refers to the foam (bubbles) generated when the dust suppressant composed of the water-soluble foam stock solution form is mixed with water. The dust suppressant of one embodiment of the present invention can only be mixed with water to prepare the dust suppressant aqueous solution when it is a product in the form of a water-soluble foam stock solution. In this way, the dust suppressant can be expanded to a volume corresponding to the foaming ratio and uniformly dispersed and applied to a large amount of coal in the form of foam.

[0046] In one embodiment of the present invention, the purpose of formulating the dust suppressant in the form of a water-soluble foam concentrate is to disperse and apply the key substances of the dust suppressant to all bituminous coals at an appropriate concentration (ppm) as evenly as possible.

[0047] Here, the purpose of the dust suppressant of one embodiment of the present invention is to smoothly generate foam by mixing with water. If it is also mixed with air, foam can be generated more smoothly, thereby enabling the dust suppressant to be evenly dispersed and applied to the coal.

[0048] That is, even if air is not artificially mixed with the dust suppressant, since water is supplied by water pressure, air and water are mixed with the dust suppressant within the foaming ratio range, so there is no problem in generating foam. In order to generate better foam more smoothly and keep it better, air can be mixed by a compressor or the like.

[0049] The dust inhibitor may be sprayed at a ratio of 1 to 5% by weight to 95 to 99% by weight of water. When the dust inhibitor is too little, the adsorption of the scattered dust may be reduced, thereby reducing the quality. When the dust inhibitor is too much, the economic efficiency may be reduced. More specifically, the dust inhibitor may be sprayed at a ratio of 1 to 3% by weight to 97 to 99% by weight of water.

[0050] According to the embodiment of the present invention, even if the coal after spraying the dust suppressant becomes a dry state without moisture, a unique condensation phenomenon (caking) will occur, showing the characteristic of minimizing the scattered dust. This characteristic is a characteristic that the conventional bubble-type anti-scattering agent cannot show, and it is a phenomenon caused by the special surfactant compound composition of the present invention. The embodiment of the present invention provides a technology that allows actual demand units to store coal for a long time before use even without watering operations.

[0051] The following describes preferred embodiments and comparative examples of the present invention. However, the following embodiment is only a preferred embodiment of the present invention, and the present invention is not limited to the following embodiment.

[0052] Example

[0053] The dust suppressant was prepared by mixing the ingredients and proportions in Table 1. 250 ml of an aqueous solution containing 1 wt% of the dust suppressant was poured into each container, and then 2.5 g of coal in the form of 100 mesh powder was placed into the container, and the sedimentation time of the coal in the aqueous solution was measured and recorded in Table 1.

[0054] In addition, in order to evaluate the dust suppression after drying, 50 g of coal was placed in a dish-shaped container, and 10 ml of a dust inhibitor aqueous solution with a dust inhibitor content of 1 wt % was sprayed on each container. The container was then dried and the state after drying was measured and recorded in the following Table 1.

[0055] [Table 1]

[0056]

[0057]

[0058] As can be seen from Table 1, the sedimentation time of Examples 1 to 3 including appropriate amounts of anionic surfactants, nonionic surfactants and glycol ethers as in Examples 1 to 3 is shorter, and coagulation occurs.

[0059] That is, it was confirmed that the generation of coal dust was suppressed after spraying the dust suppressant aqueous solution according to one embodiment of the present invention. Furthermore, it was confirmed that the dust suppressant has the property of suppressing the generation of dust for a long time.

[0060] On the other hand, it was confirmed that since no nonionic surfactant or no anionic surfactant was added in Comparative Examples 1 and 2, the permeability thereof was inferior to that of Examples 1 to 3.

[0061] It was also confirmed that the commercially available F500 was not only inferior to Examples 1 to 3 in terms of permeability, but also did not cause condensation, and therefore it was difficult to suppress dust generation for a long period of time.

[0062] The present invention is not limited to the above-mentioned embodiments, and can be prepared in a variety of different forms. Those skilled in the art of the present invention should understand that it can be implemented in other specific forms without changing the technical ideas or essential features of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all aspects, rather than restrictive.

Claims

1. A dust suppressant comprising 25 to 40% by weight of anionic surfactant, 5 to 15% by weight of nonionic surfactant, 15 to 20% by weight of glycol ether and 30 to 40% by weight of solvent, The anionic surfactant comprises dioctyl sodium sulfosuccinate, The nonionic surfactant comprises polyoxyethylene alkyl ether, The glycol ether includes diethylene glycol monobutyl ether.

2. The dust suppressant according to claim 1, further comprising 0.1 to 10 wt % of a foam stabilizer.

3. A dust suppression method, wherein the dust suppressant according to claim 1 or 2 in the form of a foam stock solution is sprayed together with water by water pressure, thereby spraying it toward coal in the form of bubbles.

4. The dust suppression method according to claim 3, wherein: The dust suppressant is sprayed in a ratio of 1 to 5 weight % and the water is sprayed in a ratio of 95 to 99 weight %.

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