A type II coal dust suppressant and its preparation method and application

Abstract

The invention discloses a type II coal dust suppressant and a preparation method and application thereof. The dust suppressant comprises, by weight, 5-20 parts of a crusting agent, 5-20 parts of a binder, 2-10 parts of a toughening agent, 2-10 parts of a reinforcing agent, 1-3 parts of a penetrant, and the balance is pregelatinized starch. The invention adopts a toughening agent and a reinforcing agent to improve the toughness and strength of the type II coal transportation dust suppressant, solves the problem that the dust suppression effect of railway coal transportation is poor due to a large slope and high wind speed, and has obvious economic benefits, social benefits and environmental benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of dust suppression, and specifically relates to a type II coal dust suppressant and a preparation method and application thereof. Background Art

[0002] Railway transportation has become the main way of transporting coal due to its advantages of fast speed, large transportation volume, low cost and little influence by weather. In the process of railway coal transportation, the bumps caused by the roadbed, turnouts and track facilities or the disturbed airflow generated when passing through the tunnel cause coal powder and coal particles to fly, resulting in environmental pollution and transportation safety problems. Usually, by spraying coal dust suppressants, a crust layer with a thickness of more than 10 mm is formed on the surface of the coal, so that the crust layer will not peel off during the train running, which effectively suppresses the flying of coal powder and coal particles and has a good dust suppression effect. This method is simple to construct, has good effects, saves time and labor, is low in cost and easy to implement. It is a good way to solve the problem of coal powder and coal particles flying.

[0003] Due to the characteristics of railway coal transportation such as large slope and high wind speed, the strength and toughness of the solidified layer of the existing dust suppressant are poor, and the wind erosion rate does not meet the standard under 12-14 wind (wind speed 32.7-46.1m / s). Therefore, it is urgent to develop new, environmentally friendly, high-performance special coal transportation dust suppressants to solve the problems of environmental pollution and transportation safety caused by railway coal transportation. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the wind erosion rate of the dust suppressant in the prior art does not meet the standard under 12-14 wind force (wind speed 32.7-46.1m / s), especially for the characteristics of large slope and high wind speed in coal transportation, to provide a high-strength and toughness type II coal dust suppressant and its preparation method and application.

[0005] The technical solution of the present invention is as follows:

[0006] A type II coal dust suppressant, which comprises, based on 100 parts by weight, 5-20 parts of a crusting agent, 5-20 parts of a binder, 2-10 parts of a toughening agent, 2-10 parts of a reinforcing agent, 1-5 parts of a penetrant, and the balance is pregelatinized starch.

[0007] A type II coal dust suppressant, which comprises, based on 100 parts by weight, 8-16 parts of a crusting agent, 6-15 parts of a binder, 4-8 parts of a toughening agent, 3-8 parts of a reinforcing agent, 1-3 parts of a penetrant, and the balance being pregelatinized starch.

[0008] According to an embodiment of the present invention, the crusting agent is sodium polyallyl sulfonate, for example, sodium polyallyl sulfonate having a weight average molecular weight of 10,000-600,000.

[0009] According to an embodiment of the present invention, the binder is modified guar gum, and the modified guar gum is, for example, sulfonated guar gum, and the degree of sulfonethyl substitution is, for example, 0.2-0.5.

[0010] According to an embodiment of the present invention, the toughening agent is a modified high-amylose starch, and the modified high-amylose starch is, for example, sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is, for example, 0.2-0.5.

[0011] According to an embodiment of the present invention, the preparation method of the modified guar gum or modified high-amylose starch is as follows: guar gum or high-amylose starch is mixed with a solvent (such as ethanol), and then reacted with a sulfonylating agent (such as sodium 2-chloroethylsulfonate) in the presence of an alkali (such as sodium hydroxide) to obtain the modified guar gum or modified high-amylose starch.

[0012] In one embodiment of the present invention, the preparation method of the modified guar gum or high-amylose starch is as follows: first, 200 parts by weight of ethanol are placed in a reaction kettle, a stirrer is started, 50 parts by weight of guar gum (or high-amylose starch) are added, pH=11 is adjusted with sodium hydroxide powder, and stirred at 35° C. for 20 minutes; the temperature is raised to 55° C., 16 parts by weight of sodium 2-chloroethylsulfonate are added, and the reaction is carried out for 100 minutes; hydrochloric acid solution is added to adjust pH=8; concentration and centrifugation are performed, and the filter cake is washed with 10 parts by weight of 95% ethanol, and the modified guar gum (or modified high-amylose starch) is obtained after drying.

[0013] According to an embodiment of the present invention, the enhancing agent is sodium humate.

[0014] According to an embodiment of the present invention, the penetrant is alkyl alcohol amide, such as alkyl alcohol amide with model number 6503.

[0015] According to an embodiment of the present invention, the thickness of the solidified layer of the dust suppressant on the surface of the carrier is 20-30 mm.

[0016] According to an embodiment of the present invention, the wind erosion rate of the dust suppressant is 0.1-0.5%.

[0017] According to an embodiment of the present invention, in the dust suppressant, the weight ratio between the toughening agent and the pregelatinized starch is 1:6 to 1:20, preferably 1:6 to 1:18, more preferably 1:6 to 1:16, and most preferably 1:6 to 1:15. The weight ratio between the reinforcing agent and the pregelatinized starch is 1:6 to 1:26, preferably 1:8 to 1:22, more preferably 1:10 to 1:20, and most preferably 1:10 to 1:18.

[0018] The present invention also provides a method for preparing a type II coal dust suppressant, the method comprising the following steps:

[0019] The type II coal dust suppressant is prepared by mixing a crusting agent, a binder, a toughening agent, a reinforcing agent, a penetrant and pregelatinized starch.

[0020] Exemplarily, the mixture is stirred and mixed in a mixer.

[0021] As an exemplary embodiment, the preparation method includes the following steps: adding 8-16 parts of a crusting agent, 6-15 parts of a binder, 4-8 parts of a toughening agent, 3-8 parts of a reinforcing agent, 1-3 parts of a penetrant, and the balance being pregelatinized starch into a mixer and stirring evenly to obtain a Type II coal dust suppressant.

[0022] The present invention also provides an application of a type II coal dust suppressant for coal transportation, preferably for railway coal transportation; for example, for Daqin Railway coal transportation.

[0023] The present invention also provides a method for using the type II coal dust suppressant, which comprises dissolving the type II coal dust suppressant in water, and then spraying the dust suppressant aqueous solution onto the surface of the transported coal.

[0024] According to an embodiment of the present invention, the mass ratio of the Type II coal dust suppressant to water is 1:50 to 200, preferably 1:100.

[0025] According to an embodiment of the present invention, the Type II coal dust suppressant solution is a uniform and stable liquid.

[0026] According to the embodiment of the present invention, the spraying amount of the type II coal dust suppressant solution is, for example, 2.2 L / m 2 . Beneficial effects of the present invention:

[0027] The present invention adopts new toughening agents and reinforcing agents to improve the strength and toughness of Type II coal transportation dust suppressants, solving the problem of poor dust suppression effect due to large slope and high wind speed in coal transportation on the Daqin Railway, and has obvious economic, social and environmental benefits.

[0028] The preparation method of the present invention does not go through any chemical reaction process, but only requires a simple physical mixing method. The prepared type II coal dust suppressant has good crusting performance, film-forming performance, wetting performance, thick solidified layer, high crusting layer strength and strong toughness, and is a special coal dust suppressant.

[0029] All raw materials used in the present invention are natural and degradable raw materials, which avoid secondary environmental pollution and have no adverse effects on train carriages and coal quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a picture of the sample of Type II coal transportation dust suppressant prepared in Example 1 of the present invention after use.

[0031] Figure 2 This is a picture of the sample of coal transportation dust suppressant prepared in Comparative Example 2 after use. DETAILED DESCRIPTION

[0032] The technical scheme of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only exemplary descriptions and explanations of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included in the scope that the present invention is intended to protect.

[0033] Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

[0034] Example 1

[0035] S1: Preparation of Type II coal transportation dust suppressant product: Add 16 parts of sodium polyallyl sulfonate, 15 parts of modified guar gum, 8 parts of modified high-amylose starch, 8 parts of sodium humate, 3 parts of alkyl alcohol amide 6503, and 50 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0036] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0037] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0038] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0039] Figure 1 This is a picture of the sample of Type II coal transportation dust suppressant prepared in Example 1 after use. Figure 2 This is a picture of the sample of the coal transportation dust suppressant prepared in Comparative Example 2 after use. Figure 1 It can be seen that: for the sample sprayed with Type II coal transportation dust suppressant, the crust layer on the surface of the coal did not change at all after being tested in a wind tunnel with a wind speed of 12-14 (wind speed 32.7-46.1m / s) for 20 minutes; Figure 2 It can be seen that the sample sprayed with the comparative example of coal transportation dust suppressant was tested in a wind tunnel with a wind speed of 12-14 (wind speed 32.7-46.1m / s) for 20 minutes, and the crust layer on the surface of the coal was severely damaged.

[0040] Example 2

[0041] S1: Preparation of Type II coal transportation dust suppressant product: Add 16 parts of sodium polyallyl sulfonate, 12 parts of modified guar gum, 8 parts of modified high-amylose starch, 8 parts of sodium humate, 3 parts of alkyl alcohol amide 6503, and 53 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0042] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0043] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0044] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0045] Example 3

[0046] S1: Preparation of Type II coal transportation dust suppressant product: Add 16 parts of sodium polyallyl sulfonate, 10 parts of modified guar gum, 8 parts of modified high-amylose starch, 8 parts of sodium humate, 3 parts of alkyl alcohol amide 6503, and 55 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0047] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0048] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0049] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0050] Example 4

[0051] S1: Preparation of Type II coal transportation dust suppressant product: Add 16 parts of sodium polyallyl sulfonate, 8 parts of modified guar gum, 8 parts of modified high-amylose starch, 8 parts of sodium humate, 3 parts of alkyl alcohol amide 6503, and 57 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0052] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0053] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0054] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0055] Example 5

[0056] S1: Preparation of Type II coal transportation dust suppressant product: Add 16 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 8 parts of modified high-amylose starch, 8 parts of sodium humate, 3 parts of alkyl alcohol amide 6503, and 59 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0057] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0058] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0059] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0060] Example 6

[0061] S1: Preparation of Type II coal transportation dust suppressant product: Add 16 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 6 parts of modified high-amylose starch, 8 parts of sodium humate, 3 parts of alkyl alcohol amide 6503, and 61 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0062] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0063] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0064] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0065] Example 7

[0066] S1: Preparation of Type II coal transportation dust suppressant product: Add 16 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 4 parts of modified high-amylose starch, 8 parts of sodium humate, 3 parts of alkyl alcohol amide 6503, and 63 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0067] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0068] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0069] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0070] Example 8

[0071] S1: Preparation of Type II coal transportation dust suppressant product: Add 16 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 4 parts of modified high-amylose starch, 6 parts of sodium humate, 3 parts of alkyl alcohol amide 6503, and 65 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0072] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0073] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0074] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0075] Example 9

[0076] S1: Preparation of Type II coal transportation dust suppressant product: Add 16 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 4 parts of modified high-amylose starch, 4 parts of sodium humate, 3 parts of alkyl alcohol amide 6503, and 67 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0077] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0078] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0079] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.5; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.2.

[0080] Example 10

[0081] S1: Preparation of Type II coal transportation dust suppressant product: Add 16 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 4 parts of modified high-amylose starch, 3 parts of sodium humate, 3 parts of alkyl alcohol amide 6503, and 68 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0082] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0083] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0084] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.2; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.5.

[0085] Embodiment 11

[0086] S1: Preparation of Type II coal transportation dust suppressant product: Add 16 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 4 parts of modified high-amylose starch, 3 parts of sodium humate, 2 parts of alkyl alcohol amide 6503, and 69 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0087] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0088] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0089] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0090] Example 12

[0091] S1: Preparation of Type II coal transportation dust suppressant product: Add 16 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 4 parts of modified high-amylose starch, 3 parts of sodium humate, 1 part of alkyl alcohol amide 6503, and 70 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0092] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0093] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0094] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0095] Example 13

[0096] S1: Preparation of Type II coal transportation dust suppressant product: Add 14 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 4 parts of modified high-amylose starch, 3 parts of sodium humate, 1 part of alkyl alcohol amide 6503, and 72 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0097] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0098] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0099] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0100] Embodiment 14

[0101] S1: Preparation of Type II coal transportation dust suppressant product: Add 12 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 4 parts of modified high-amylose starch, 3 parts of sodium humate, 1 part of alkyl alcohol amide 6503, and 74 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0102] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0103] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0104] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0105] Embodiment 15

[0106] S1: Preparation of Type II coal transportation dust suppressant product: Add 10 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 4 parts of modified high-amylose starch, 3 parts of sodium humate, 1 part of alkyl alcohol amide 6503, and 76 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0107] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0108] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0109] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0110] Example 16

[0111] S1: Preparation of Type II coal transportation dust suppressant product: Add 8 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 4 parts of modified high-amylose starch, 3 parts of sodium humate, 1 part of alkyl alcohol amide 6503, and 78 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0112] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0113] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0114] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0115] Comparative Example 1

[0116] S1: Preparation of Type II coal transportation dust suppressant product: Add 11 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 4 parts of modified high-amylose starch, 1 part of alkyl alcohol amide 6503, and 78 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0117] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0118] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0119] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25; the modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.35.

[0120] Comparative Example 2

[0121] S1: Preparation of Type II coal transportation dust suppressant product: Add 15 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 1 part of alkyl alcohol amide 6503, and 78 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0122] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0123] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0124] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25.

[0125] Comparative Example 3

[0126] S1: Preparation of Type II coal transportation dust suppressant product: Add 12 parts of sodium polyallyl sulfonate, 6 parts of modified guar gum, 3 parts of sodium humate, 1 part of alkyl alcohol amide 6503, and 78 parts of pregelatinized starch into a mixer, stir evenly, and package into 25 kg packages to obtain Type II coal transportation dust suppressant product.

[0127] S2: Preparation of Type II coal transportation dust suppressant solution: Measure 2500 kg of tap water and add it to a mixing tank, take 25 kg of the above-mentioned Type II coal transportation dust suppressant product and add it to the mixing tank in five batches, stir for 20-60 minutes, and obtain the Type II coal transportation dust suppressant aqueous solution.

[0128] S3: Spraying of Type II coal transportation dust suppressant: 2.2L / m 2 Spraying Amount: Spray the above dust suppressant aqueous solution onto the coal surface of the coal transport train.

[0129] The modified guar gum is sulfoethylated guar gum, and the degree of sulfoethyl substitution is 0.25.

[0130] Test Case

[0131] The dust suppressant solutions (ie, sample solutions) prepared in Examples 1-16 and Comparative Examples 1-3 were subjected to the following tests to verify their application properties.

[0132] Viscosity determination:

[0133] The dust suppressant solutions (i.e., sample solutions) prepared in Examples 1-16 and Comparative Examples 1-3 were placed in a 25°C water bath and kept warm for 20 min. The viscosity of the sample solutions was measured using a DV2TLVTJ0 viscometer, a No. 0 rotor, and a speed of 60 rpm. The viscosity measurement standard was determined in accordance with Part 1 of the Technical Conditions for Dust Suppression in Railway Coal Transportation, Railway Industry Standard TB / T3210.1-2020 of the People's Republic of China.

[0134] Determination of pH value:

[0135] (1) Soak the glass electrode according to the instructions of the acidometer. For the same sample, select two standard buffer solutions with similar pH values ​​to calibrate the acidometer.

[0136] (2) Place the beaker containing the sample solution in a constant temperature bath at 25±1℃. After the temperature reaches a stable equilibrium, rinse the glass electrode with distilled water and wipe it dry. Then wash the electrode with the sample solution and insert it into the sample for measurement.

[0137] (3) In the measurement of three consecutive samples, if the difference in pH value of the three samples is greater than 0.2, three new samples should be taken and measured again until the difference in pH value is no greater than 0.2.

[0138] (4) Take the arithmetic mean of the pH values ​​of the three samples as the experimental result, and retain one decimal place.

[0139] Solid content determination:

[0140] (1) Take the sample solution with a mass of (1.0±0.1) g, accurate to 0.001 g, the experimental temperature is (105±2)°C, and the experimental time is (180±5) min. During the experiment, be sure to gently rotate the weighing bottle to completely flatten the sample solution to cover the entire bottom of the bottle.

[0141] (2) The test result is the average value of two parallel samples. If the difference between the two parallel samples (relative to the average value) is greater than 2%, the test needs to be repeated.

[0142] Determination of cured layer thickness and wind erosion rate

[0143] Select coal samples with mesh sizes ranging from 10 to 30, dry them in an oven at (50±2)℃ for 300min to remove moisture, and then place them in an environment with a temperature of (20±5)℃ and a relative humidity of ≤50% for 1h. Take an appropriate amount of dried coal and place them in two (300mm x 210mm x30mm) solid and non-deformable trays that have been weighed at a constant weight at the test temperature and have a mass of W, so that the coal samples are placed in the trays in a trapezoidal shape. Place the coal samples in the two trays at 2.2L / m 2Spraying amount: Spray sample 1 and sample 2 of the sample solution in the same embodiment respectively, place them in an ambient temperature of (20±5)℃ and relative humidity ≤50% for 1 hour, place them in an oven at (50±2)℃ for 120 minutes, and weigh them respectively, where the mass of the coal and the tray is W. 1 The prepared samples were placed in a wind tunnel and subjected to wind erosion for 20 minutes at a wind speed of (30.0±0.2) m / s on the coal seam surface. They were then weighed separately. The mass of the remaining coal and the tray was W. 2 . Then calculate the wind erosion rate of the samples according to the following formula.

[0144]

[0145] Where:

[0146] E——sample wind erosion rate;

[0147] W——the mass of the pallet;

[0148] W 1 - the quality of coal and pallets before erosion;

[0149] W 2 ——The quality of coal and pallets after wind erosion.

[0150] The wind erosion rate of sample solution 1 is E 1 The wind erosion rate of sample solution 2 is E 2 , take the average value.

[0151] Take four random points of the solidified layer from sample 1 and sample 2, and measure their thickness with a measuring tool. The average solidified layer thickness of sample 1 is H. 1 The average cured layer thickness of sample 2 is H 2 , and then take the average value, which is the thickness of the solidified layer.

[0152] The test results of the above parameters are shown in Table 1.

[0153] Table 1

[0154]

[0155] Conclusion: The Type II coal dust suppressant prepared by the method of the present invention is used, for example, in the Daqin Railway coal transportation dust suppression, and the various technical indicators of the dust suppressant meet the requirements of the Railway Industry Standard of the People's Republic of China TB / T3210.1-2020 Technical Conditions for Railway Coal Transportation Dust Suppression Part 1; the Type II coal dust suppressant prepared by the method of the present invention has good toughness and strength. In contrast, the dust suppressant products obtained in Comparative Examples 1-3 have poor toughness and strength, or the products themselves do not meet the Type II coal dust suppressant quality standards in terms of, for example, the strength of the solidified layer formed or the wind erosion rate.

[0156] The above is an exemplary description of the embodiments of the present invention. However, the protection scope of the present invention is not limited to the above embodiments. Any modification, equivalent substitution, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A type II coal dust suppressant, characterized in that: The dust suppressant comprises, based on 100 parts by weight, 5-20 parts of a crusting agent, 5-20 parts of a binder, 2-10 parts of a toughening agent, 2-10 parts of a reinforcing agent, 1-5 parts of a penetrant, and the balance is pregelatinized starch; The encrusting agent is sodium polyallyl sulfonate; The binder is modified guar gum; The toughening agent is modified high-amylose starch; The enhancing agent is sodium humate; The penetrant is an alkyl alcohol amide; The modified guar gum is sulfoethylated guar gum, and the sulfoethyl substitution degree is 0.2-0.5; The modified high-amylose starch is sulfoethylated high-amylose starch, and the degree of sulfoethyl substitution is 0.2-0.

5.

2. The dust suppressant according to claim 1, characterized in that: The dust suppressant comprises, based on 100 parts by weight, 8-16 parts of a crusting agent, 6-15 parts of a binder, 4-8 parts of a toughening agent, 3-8 parts of a reinforcing agent, 1-3 parts of a penetrant, and the balance is pregelatinized starch.

3. The type II coal dust suppressant according to claim 1, characterized in that: The crusting agent is sodium polyallyl sulfonate with a weight average molecular weight of 10,000-600,000.

4. The type II coal dust suppressant according to claim 1, characterized in that: The penetrant is alkyl alcohol amide with model number 6503.

5. The type II coal dust suppressant according to claim 1, characterized in that: The thickness of the solidified layer of the dust suppressant on the surface of the carrier is 20-30 mm.

6. The type II coal dust suppressant according to claim 1, characterized in that: The wind erosion rate of the dust suppressant is 0.1-0.5%.

7. The type II coal dust suppressant according to any one of claims 1 to 6, characterized in that: In the dust suppressant, the weight ratio between the toughening agent and the pregelatinized starch is 1:6 to 1:

20.

8. The method for preparing the Type II coal dust suppressant according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: The crusting agent, binder, toughening agent, reinforcing agent, penetrant and pregelatinized starch are mixed in the proportions described in any one of claims 1 to 7 to prepare a type II coal dust suppressant.

9. Use of the Type II coal dust suppressant according to any one of claims 1 to 7 for coal transportation.

10. The use according to claim 9, characterized in that: The type II coal dust suppressant is used for railway coal transportation.

11. The method for using the type II coal dust suppressant according to any one of claims 1 to 7, characterized in that: The Type II coal dust suppressant according to any one of claims 1 to 7 is dissolved in water, and then the dust suppressant aqueous solution is sprayed onto the surface of the transported coal; the mass ratio of the Type II coal dust suppressant to water is 1:50-200.

Images