Composite dust suppression inhibitor as well as preparation method and application thereof

Abstract

The invention relates to the technical field of coal mine dust suppression inhibitors, in particular to a composite dust suppression inhibitor and a preparation method and application thereof. Raw materials of the composite dust suppression inhibitor comprise a urease solution and a cementing solution. The volume ratio of the urease solution to the cementing liquid is (0.75-1.5): 1. The invention provides an easily self-fired coal composite dust suppression inhibitor and a method thereof. The defect that the inhibition effect of a traditional single inhibitor is not obvious is effectively overcome, the advantages of the physical inhibition aspect and the chemical inhibition aspect are effectively coordinated, the good dust raising inhibition effect is achieved, and the dust suppression and inhibition effects are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine dust suppression inhibitors, and in particular to a composite dust suppression inhibitor and a preparation method and application thereof. Background Art

[0002] Spontaneous combustion of coal is a global problem that affects the safe recovery of coal resources. It not only causes a large amount of coal resources to be wasted, but also produces a large amount of greenhouse gases. Spontaneous combustion of coal is potentially dangerous, the fire source is hidden, and it is difficult to control, which seriously affects the safe production of coal mines. In recent years, the widespread application of comprehensive mechanized coal mining technology has brought higher benefits to coal mining companies, but also faces more severe fire prevention pressure in the goaf of the working face. Therefore, taking necessary and effective measures to prevent and control spontaneous combustion of coal is of great practical significance to the safe production of coal mines.

[0003] A large amount of dust is generated during the transportation of coal, including coal dust, material particles, and other dust. Long-term inhalation of coal dust can easily lead to coal workers' pneumoconiosis, which usually occurs in about 15 to 20 years. Coal dust can also cause local irritation to the respiratory mucosa, causing chronic diseases such as rhinitis, pharyngitis, and tracheitis. Coal mine dust seriously threatens the safe production of mines and the health of employees. In order to eliminate dust hazards, prevent coal dust explosion accidents, and protect the safety and health of employees, reasonable and effective dust suppression measures must be taken. Summary of the invention

[0004] In view of this, the present invention provides a composite dust suppression inhibitor and a preparation method and application thereof, which are used to solve the technical problems in the prior art that a single inhibitor has a weak inhibition effect, a short inhibition time, an unobvious dust suppression effect, and a high cost.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] One of the technical solutions of the present invention is a composite dust suppression and inhibitor, the raw materials of which include urease solution and cementing liquid;

[0007] The volume ratio of the urease solution to the binder solution is 0.75 to 1.5:1.

[0008] The second technical solution of the present invention is a method for preparing the above-mentioned composite dust suppression inhibitor, comprising the following steps:

[0009] The urease solution and the cementing liquid are mixed evenly to obtain the composite dust suppression inhibitor;

[0010] When the raw materials also include anionic surfactants and nonionic surfactants, the anionic surfactants and nonionic surfactants are first added to the urease solution and mixed evenly, and then mixed with the binder to obtain the composite dust suppression and inhibitor.

[0011] The third technical solution of the present invention is the application of the above-mentioned composite dust suppressant and inhibitor in coal mining or transportation.

[0012] The present invention discloses the following technical effects:

[0013] The present invention provides a composite dust suppression inhibitor for easily self-igniting coal and a method thereof. The present invention effectively overcomes the defect that the traditional single inhibitor has a weak inhibitory effect, effectively coordinates the advantages of physical inhibition and chemical inhibition, and has a good dust suppression effect, combining dust suppression and inhibitory effects. At the same time, the present invention utilizes the characteristics of soybean meal being rich in urease and low in cost, and uses soybean meal as one of the main raw materials for synthesis. The production process is simple, green and environmentally friendly, and the raw material cost is low and easy to obtain, thereby effectively reducing the difficulty and cost of the production and preparation of the inhibitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 is the CO release of Zhundong raw coal and catalytic coal samples in Application Example 1.

[0016] Figure 2 is the inhibition rate of the inhibitory coal sample in Application Example 1.

[0017] Figure 3 It is the inhibition life of the inhibition coal sample in Application Example 1.

[0018] Figure 4 This is the dust suppression experimental platform in Application Example 2.

[0019] Figure 5 This is the mass loss trend of each group of coal samples at different coal dust particle sizes of Zhundong coal in Application Example 2.

[0020] Figure 6 This is the dust concentration change trend of each group of coal samples at different coal dust particle sizes of Zhundong coal in Application Example 2. DETAILED DESCRIPTION

[0021] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0022] It should be understood that the terms described in the present invention are only for describing a particular embodiment and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0023] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0024] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to the skilled artisan. The present invention description and examples are exemplary only.

[0025] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0026] The present invention utilizes the characteristics of soybean meal being rich in urease and having low cost, adopts the technology of efficiently extracting urease solution from soybean meal solution, and obtains urease solution through the steps of drying, crushing, filtering, preparing solution, centrifugal filtering and the like from the soybean meal, and under the catalysis of urease, carbonate ions and calcium ions form carbonate precipitates with gelling effect in the system, thereby obtaining a novel composite dust inhibitor with good dust inhibition effect and long-lasting action time.

[0027] The first aspect of the present invention provides a composite dust suppression and inhibitor, the raw materials of which include urease solution and cementing liquid;

[0028] The volume ratio of the urease solution to the cementing liquid is 0.75 to 1.5: 1. More preferably, the volume ratio of the urease solution to the cementing liquid is 1:1.

[0029] In the present invention, if the volume ratio of urease solution to binder is too high or too low, the quality of generated calcium carbonate will be reduced, and more calcium carbonate with bonding effect cannot be formed, resulting in reduced retardation effect and insufficient dust suppression effect.

[0030] The composite dust suppression inhibitor of the present invention has more excellent and significant inhibitory effect.

[0031] In some embodiments of the present invention, the method for preparing the urease solution comprises the following steps:

[0032] The soybean meal powder and water are mixed and stirred, then allowed to stand, and centrifuged to obtain the urease solution.

[0033] In some embodiments of the present invention, the mass ratio of the soybean meal powder to water is 1:4 to 7. More preferably, it is 1:4.

[0034] In some embodiments of the present invention, the binder is prepared by dissolving calcium chloride and urea in water; the molar ratio of the calcium chloride to the urea is 1:0.75 to 1.5, and more preferably, 1:1.5.

[0035] In the present invention, if the molar ratio of calcium chloride to urea is too high or too low, the quality of the generated calcium carbonate will be reduced, and more calcium carbonate with a bonding effect cannot be formed, the retardation effect is reduced, and the dust suppression effect is insufficient.

[0036] In some embodiments of the present invention, the molar concentration of calcium chloride in the binder is 1 to 1.6 mol / L, and more preferably 1.4 mol / L.

[0037] In the present invention, if the molar concentration of calcium chloride in the binder is too high or too low, the quality of the generated calcium carbonate will be reduced, and more calcium carbonate with a bonding effect cannot be formed, the retardation effect is reduced, and the dust suppression effect is insufficient.

[0038] In some embodiments of the present invention, the raw material further comprises anionic surfactant and nonionic surfactant; the addition amount of the anionic surfactant and the nonionic surfactant accounts for the mass concentration of the urease solution independently.

[0039] The mass ratio of the anionic surfactant to the nonionic surfactant may be 4:6, 5:5 or 6:4.

[0040] In some embodiments of the present invention, the anionic surfactant is sodium octyl decyl sulfate (ODS-3); and the nonionic surfactant is octyl decyl glucoside (APG0810).

[0041] In the present invention, the anionic surfactant and the nonionic surfactant play the following roles:

[0042] Anionic surfactants can reduce the surface tension of the composite dust suppression and inhibitor solution, allowing it to better infiltrate coal dust to form a complete solidified layer, enhancing the inhibitory and dust suppression effects, and at a low cost. Nonionic surfactants do not dissociate in the solution and are often used in combination with other surfactants. The wettability of the solution after compounding is better than that of a single surfactant, producing a synergistic effect.

[0043] Other surfactants commonly used in the art, such as dodecyl dimethyl betaine (BS-12) and sodium dodecyl sulfate (SDS), are also suitable for the present invention, but the wetting effect is reduced compared with the above-mentioned ODS-3 and APG0810.

[0044] The second aspect of the present invention provides a method for preparing the above-mentioned composite dust suppression inhibitor, comprising the following steps:

[0045] The urease solution and the cementing liquid are mixed evenly to obtain the composite dust suppression inhibitor;

[0046] When the raw materials also include anionic surfactants and nonionic surfactants, the anionic surfactants and nonionic surfactants are first added to the urease solution and mixed evenly, and then mixed with the binder to obtain the composite dust suppression and inhibitor.

[0047] The third aspect of the present invention provides an application of the above-mentioned composite dust suppression and inhibitor in coal mining or transportation.

[0048] The technical solutions described in the present invention, unless otherwise specified, are all conventional solutions in the art, and the reagents or raw materials used, unless otherwise specified, are purchased from commercial channels or have been disclosed.

[0049] The urease solution used in the embodiment of the present invention is prepared by the following steps:

[0050] Step 1, taking fresh soybean meal, drying it in a forced air drying oven at 35° C., crushing it fully into powder, and passing it through a 100-mesh sieve to obtain soybean meal powder;

[0051] Step 2, prepare a soybean meal solution by mixing soybean meal powder and deionized water in a mass ratio of 1:4, and stir the mixture with a magnetic stirrer, let it stand for 24 hours, and perform centrifugal filtration (the parameters of the centrifuge are set at a speed of 10000 r / min and a centrifugation time of 10 min) to obtain a urease solution.

[0052] The AOS liquid used in the embodiment of the present invention is sodium α-olefin sulfate, which is commercially available. The AOS liquid is an anionic surfactant produced by Linyi Lvsen Chemical Co., Ltd. and is a liquid (content 35%).

[0053] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0054] Example 1

[0055] Calcium chloride and urea were added into deionized water at a molar ratio of 1:1.5 to prepare a cementing liquid with a calcium chloride concentration of 1.4 mol / L.

[0056] Add ODS-35 and APG0810 to the urease solution (the mass concentrations of ODS-35 and APG0810 in the urease solution are ) to obtain a urease mixed solution.

[0057] The urease mixed solution and the binder solution are uniformly mixed in a volume ratio of 1:1 (0.75-1.5:1) to obtain a composite dust suppression and inhibitor.

[0058] Comparative Example 1

[0059] Weigh a certain mass of calcium chloride, add a certain volume of deionized water to dissolve it, and mix it thoroughly to obtain a 1.4 mol / L calcium chloride solution.

[0060] Application Example 1: Preparation of Inhibited Coal Samples

[0061] The first step is to prepare the raw coal sample, crush and sieve the fresh coal sample to obtain 30-45 mesh coal powder, put it into a drying bottle and seal it for later use;

[0062] The second step is to prepare the inhibitory coal sample. Weigh several 25g portions of Xinjiang Zhundong coal. The maximum liquid absorption capacity of the coal sample is 14ml, so 14ml of composite dust suppression inhibitor (Example 1, corresponding mark: coal sample treated with composite dust suppression inhibitor solution), calcium chloride solution (Comparative Example 1, corresponding mark: coal sample treated with calcium chloride solution) and water (corresponding mark: coal sample treated with water) are added respectively.

[0063] The inhibitory coal samples and the original coal samples were subjected to a standard inhibition experiment study on isothermal oxidation.

[0064] Put the coal sample into the coal sample tank, and then place the coal sample tank in the heating oxidation furnace. After connecting the gas line, check the air tightness of the device. If the air tightness of the device is good, continue the subsequent operation. Turn on the air generator and hydrogen generator in turn. After the gas chromatograph is preheated and ignited successfully, introduce dry air with a flow rate of 100ml / min, set the oxidation heating furnace parameters, the initial temperature is 24℃, the heating rate is 1℃ / min, and the constant temperature experiment can be started after the furnace temperature rises to 100℃. The CO release of the raw coal and each retardant coal sample is obtained. For specific data, see Figure 1 (The Zhundong raw coal in the figure refers to the unprocessed Zhundong coal).

[0065] The definition of coal inhibition rate is the percentage of the difference in CO concentration between the original coal and the inhibited coal sample to the CO concentration of the original coal. For specific data, see Figure 2 .

[0066] The definition of inhibitor life is the time that the inhibitor can effectively prevent coal from oxidizing and spontaneously combusting. For specific data, see Figure 3 (In the figure, water, composite dust suppression inhibitor, and calcium chloride correspond to the inhibited coal samples prepared after treatment with water, composite dust suppression inhibitor, and calcium chloride, respectively).

[0067] Analysis of the CO release, inhibition rate and inhibition life of the raw coal and each inhibitory coal sample shows that the CO release of Zhundong coal reaches a peak of 130.8ppm at around 250min, while the CO release of the water-treated coal sample reaches a peak of 124.5ppm at 380min, the CO release of the coal sample treated with the composite dust suppression inhibitor reaches a peak of 69.36ppm at 390min, and the CO release of the coal sample treated with calcium chloride solution reaches a peak of 76.15ppm at 360min. It can be seen that the coal sample treated with the composite dust suppression inhibitor can delay the time of the CO concentration peak by 140min compared with the raw coal, and the CO peak is greatly reduced.

[0068] Comparing the inhibition rates, the maximum inhibition rate of the Zhundong raw coal after water treatment is 64.4%, the maximum inhibition rate of the coal sample treated with the composite dust suppression inhibitor solution is 76.85%, and the maximum inhibition rate of the coal sample treated with the calcium chloride solution is 74.26%.

[0069] Comparing the inhibitor life, the inhibitor life of Zhundong raw coal after water treatment is 150 minutes, the inhibitor life after composite dust suppression inhibitor treatment is 280 minutes, and the inhibitor life after calcium chloride solution treatment is 230 minutes. The inhibitor life after composite dust suppression inhibitor treatment is the longest, which is 1.22 times that of calcium chloride inhibitor.

[0070] The above results show that the composite dust suppression inhibitor prepared in Example 1 has better inhibitory effect.

[0071] Application Example 2: Preparation of Inhibited Coal Samples

[0072] The first step is to select Xinjiang Zhundong coal, crush and screen the coal samples into 40-80 mesh (Group A), 80-100 mesh (Group B) and 100-120 mesh (Group C) coal powder, dry and seal them for later use (raw coal sample);

[0073] In the second step, multiple groups of 25g of coal powder of three particle size ranges were weighed, and 8ml of deionized water, AOS liquid and the composite dust suppression inhibitor prepared in Example 1 were sprayed onto a 9cm diameter watch glass containing 25g of coal powder, and placed in a cool place to dry for 48h.

[0074] The dust suppression performance of the composite dust suppression inhibitor was tested by using the inhibitory coal samples and the original coal samples under different coal dust particle sizes.

[0075] The experiment was carried out using the dust suppression experimental platform. The coal sample was placed at a distance of 50 cm from the center of the wind source. The coal sample was subjected to a 15-minute wind erosion experiment at the maximum wind volume. The mi and m values ​​of the coal sample before and after wind erosion were weighed, the mass loss of the coal sample was calculated, and the light scattering laser dust meter was turned on to detect the dust TSP concentration. The mass loss value and dust concentration of the raw coal and each retardant coal sample were obtained (test device such as Figure 4 shown).

[0076] Figure 5 It is the mass loss trend of each group of coal samples under different coal dust particle sizes of Zhundong coal (in the figure, water, AOS liquid, and composite dust suppression inhibitor correspond to the inhibited coal samples prepared after treatment with water, AOS liquid, and composite dust suppression inhibitor, respectively).

[0077] Figure 6 This is the dust concentration change trend of each group of coal samples under different coal dust particle sizes of Zhundong coal (in the figure, water, AOS liquid, and composite dust suppression inhibitor correspond to the inhibited coal samples prepared after treatment with water, AOS liquid, and composite dust suppression inhibitor, respectively).

[0078] By analyzing and comparing the mass loss and dust concentration of the same group of Zhundong coal samples, it can be found that the mass loss and dust concentration of the Zhundong raw coal are the highest, and the two parameter values ​​of the coal samples treated with the composite dust suppression and inhibitor are the smallest.

[0079] The above results show that the composite dust suppression inhibitor prepared in Example 1 has good dust suppression effect under different particle size conditions.

[0080] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A composite dust suppression inhibitor, characterized in that: The raw materials include urease solution and cementing solution; The volume ratio of the urease solution to the binder solution is 0.75 to 1.5:

1.

2. The composite dust suppression inhibitor according to claim 1, characterized in that: The preparation method of the urease solution comprises the following steps: The soybean meal powder and water are mixed and stirred, then allowed to stand, and centrifuged to obtain the urease solution.

3. The composite dust suppression inhibitor according to claim 2, characterized in that: The mass ratio of the soybean meal powder to water is 1:4-7.

4. The composite dust suppression inhibitor according to claim 1, characterized in that: The binder is prepared by dissolving calcium chloride and urea in water; the molar ratio of the calcium chloride to the urea is 1:0.75-1.

5.

5. The composite dust suppression inhibitor according to claim 4, characterized in that: The molar concentration of calcium chloride in the binder is 1-1.6 mol / L.

6. The composite dust suppression inhibitor according to claim 1, characterized in that: The raw materials also include anionic surfactants and nonionic surfactants; the addition amount of the anionic surfactants and nonionic surfactants accounts for the mass concentration of the urease solution independently.

7. The composite dust suppression inhibitor according to claim 6, characterized in that: The anionic surfactant is ODS-3; the nonionic surfactant is APG0810.

8. A method for preparing the composite dust suppression inhibitor according to any one of claims 1 to 7, characterized in that: The following steps are involved: The urease solution and the cementing liquid are mixed evenly to obtain the composite dust suppression inhibitor; When the raw materials also include anionic surfactants and nonionic surfactants, the anionic surfactants and nonionic surfactants are first added to the urease solution and mixed evenly, and then mixed with the binder to obtain the composite dust suppression and inhibitor.

9. Use of the composite dust suppressant and inhibitor as claimed in any one of claims 1 to 7 in coal mining or transportation.

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