A new composite inhibitor for mine and a preparation method thereof

Abstract

The application discloses a new composite inhibitor for mine, which is composed of the following components in parts by weight: physical inhibitor 5-21%, chemical inhibitor 11-32%, synergist 5-15.6%, and deionized water. The preparation method comprises two steps of material pre-distribution and solution recombination. The application effectively overcomes the defect of the traditional single inhibitor, i.e. the poor inhibition effect, and effectively coordinates the advantages of the physical inhibition and the chemical inhibition, thereby effectively delaying the initial heat release temperature of the coal, prolonging the heat absorption stage of the coal, and further inhibiting the coal spontaneous combustion reaction, greatly improving the inhibition effect. In addition, the production process is simple, the raw material cost is low, and the raw material is easy to obtain, thereby effectively reducing the production difficulty and cost of the inhibitor.

Description

TECHNICAL FIELD

[0001] The present application relates to a new type of composite inhibitor for mine and a preparation method thereof, and belongs to the technical field of coal mine inhibitors. BACKGROUND

[0002] According to statistical data, there are 25 provinces in China mainly producing coal including more than 130 coal mines, and more than 70% of the coal mines are threatened by coal spontaneous combustion. In the annual increase of coal mine accidents, the coal spontaneous combustion accidents account for a large proportion. Therefore, it is of important practical significance to take necessary and effective measures to prevent and control coal spontaneous combustion for the safety production of coal mines.

[0003] The inhibitor is a material for preventing coal from combining with oxygen and reducing the oxidation activity of coal to inhibit oxidation and prevent and control coal spontaneous combustion. The chemical inhibitor prevents coal spontaneous combustion by pre-damaging or reducing the structure with high oxidation reaction activity in the coal body, so the damage is irreversible, and the inhibition effect exists as long as the target coal body does not change, and the physical inhibitor achieves the inhibition effect by isolating the contact between coal and oxygen, water conservation, reducing the environmental temperature and other physical effects, and generally does not occur or only a small amount of chemical reaction. However, the physical inhibitor has the disadvantages of low efficiency and instability in the use process, and the chemical inhibitor has the disadvantages of poor continuous inhibition ability and short active period due to its strong reducing property. Therefore, the inhibition effect of single physical or chemical inhibitor is not obvious, the prevention effect is not significant, and the technical problems of low efficiency, high cost and the like need to be improved.

[0004] Therefore, in view of this problem, the present application provides a new type of composite inhibitor for mine and a preparation method and application, which are used to solve the technical problems of single inhibitor in the prior art, such as non-obvious prevention effect, low efficiency, high cost and the like. SUMMARY

[0005] In order to solve the problems in the prior art, the present application provides a new type of composite inhibitor for mine and a preparation method thereof.

[0006] A new type of composite inhibitor for mine is composed of the following components by weight percentage: 5% to 21% of physical inhibitor, 11% to 32% of chemical inhibitor, 5% to 15.6% of synergist, and the balance of deionized water.

[0007] Further, the physical inhibitor is urea, the chemical inhibitor is a mixture of tea polyphenol and luteolin in a proportion of 1-10:1, and the synergist is sodium chloride.

[0008] A preparation method of a new type of composite inhibitor for mine includes the following steps:

[0009] S1, material pre-arrangement, first add physical resistance agent, chemical resistance agent, synergist into deionized water respectively, get physical resistance agent water solution with concentration of 15%-30%, chemical resistance agent water solution with concentration of 10%-40% and synergist water solution with concentration of 5%-10% respectively, and store independently;

[0010] S2, solution compounding, add physical resistance agent water solution and chemical resistance agent water solution into mixing mechanism, pre-mix for 1-5 minutes under stirring, then add synergist water solution into mixed solution for secondary mixing, and continuously stir and mix for 30-40 minutes, so as to get finished product composite resistance agent, and store the finished product composite resistance agent in storage mechanism for standby.

[0011] Further, in the S2 step, the stirring speed is 1000-2000r / min, and the environmental temperature during stirring and storage of the finished product composite resistance agent is 25-30℃.

[0012] Further, in use, the composite resistance agent is mixed with coal powder at a ratio of 1:2, and then placed for 12h, and finally dried at 30-35℃ for 24h to obtain resistance coal sample.

[0013] Further, in the S1 and S2 steps, the preparation is carried out through a batching system, wherein the batching system comprises a bearing frame, a main stirring mixing tank, auxiliary mixing tanks, a water treatment device, a water storage tank, a material buffer tank, a metering pump and a driving circuit, the bearing frame is a columnar frame structure with "H" shape in axial section, and an arrangement cavity and a storage cavity are coaxially arranged on the upper end surface and the lower end surface of the bearing frame respectively, the auxiliary mixing tanks are embedded in the arrangement cavity and connected with the bottom and the side wall of the arrangement cavity, the auxiliary mixing tanks are connected in parallel, and the auxiliary mixing tanks are respectively connected with the main stirring mixing tank through the metering pump, the main stirring mixing tank is embedded in the arrangement cavity and connected with the bottom of the arrangement cavity and coaxially arranged, the main stirring mixing tank is respectively connected with the water storage tank and the material buffer tank through the metering pump, the water storage tank and the material buffer tank are embedded in the storage cavity and distributed around the axis of the bearing frame, the water storage tank is connected with the water treatment device, the water treatment device is at least one and embedded in the bearing frame corresponding to the bottom of the arrangement cavity and the storage cavity, the driving circuit is arranged on the outer side surface of the bearing frame, and the driving circuit is electrically connected with the main stirring mixing tank, the auxiliary mixing tanks, the water treatment device, the material buffer tank and the metering pump.

[0014] Further, the main mixing tank, auxiliary mixing tank and material buffer tank comprise a tank body, a sealing cover, a stirring mechanism, a temperature sensor and an electric heating mechanism, wherein the upper end surface of the tank body is connected with the sealing cover and forms a closed cavity structure with a rectangular axial section, the bottom of the tank body is provided with a discharge port, the sealing cover is provided with at least one feeding port, the discharge port and the feeding port are respectively communicated with the metering pump through flow guide pipes, and control valves are arranged at the discharge port and the feeding port, the electric heating mechanism is at least two, is embedded in the inner surface of the side wall of the tank body, and is uniformly distributed around the axis of the tank body, the stirring mechanism is embedded in the tank body, is coaxially distributed with the tank body and is connected with the sealing cover, and the temperature sensor is connected with the outer surface of the stirring mechanism.

[0015] Further, the stirring mechanism comprises a guide column, an ultrasonic oscillator and a spring, wherein the guide column is a columnar structure with a rectangular axial section, the upper end surface of the guide column is connected with the sealing cover and is coaxially distributed with the sealing cover and the tank body, the ultrasonic oscillator is at least three, is embedded in the guide column, is coaxially distributed with the guide column and is uniformly distributed along the axial direction of the guide column, each ultrasonic oscillator independently operates, the spacing between adjacent two ultrasonic oscillators is not less than 10 cm, the spring is a plurality of plates with a rectangular cross section, and the spring is a plate structure in any one of trapezoidal, sector and triangular shapes, the rear end surface of each spring is connected with the outer side surface of the guide column through a spring, each spring is uniformly distributed around the axis of the guide column, the outer side surface of the guide column is connected with the temperature sensor, and the ultrasonic oscillator is electrically connected with the driving circuit.

[0016] Further, the spacing between the rear end surface of the spring and the outer side surface of the guide column is 3-10 mm, the spacing between the front end surface of the spring and the side wall of the tank body is 5-20 cm, the plate surface of the spring and the axis of the guide column form an angle of 30°-90°, and the spacing between adjacent two springs distributed from top to bottom along the axial direction of the guide column is 1-10 cm.

[0017] Further, the length of the guide column is 50%-80% of the height of the tank body, the guide column comprises a column body and a disc spring, the column bodies are connected through the disc springs and are coaxially distributed, each column body is a hollow columnar cavity structure with a rectangular axial section, the ultrasonic oscillator is embedded in the column body, each ultrasonic oscillator is located in an independent column body, and the spacing between adjacent two column bodies is 5-10 mm.

[0018] The present application effectively overcomes the defect of the traditional single inhibitor which has not obvious inhibition effect, and effectively coordinates the advantages of physical inhibition and chemical inhibition, thereby effectively delaying the initial heat release temperature of coal, prolonging the heat absorption stage of coal, and further inhibiting the coal spontaneous combustion reaction, greatly improving the inhibition effect; in addition, the production process is simple, the raw material cost is low, and the production and preparation difficulty and cost of the inhibitor are effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0020] Figure 1 The present application will be described in detail below in combination with the drawings and specific embodiments.

[0021] Figure 2 The present application will be described in detail below in combination with the drawings and specific embodiments.

[0022] Figure 3 The present application will be described in detail below in combination with the drawings and specific embodiments.

[0023] Figure Figure 4 The present application will be described in detail below in combination with the drawings and specific embodiments.

[0024] Figure 5 The present application will be described in detail below in combination with the drawings and specific embodiments.

[0025] Figure 6 The present application will be described in detail below in combination with the drawings and specific embodiments.

[0026] Figure 7 The present application will be described in detail below in combination with the drawings and specific embodiments.

[0027] Figure 8 The present application will be described in detail below in combination with the drawings and specific embodiments. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, purposes and effects of the present application easy to implement, the present application will be further described below in combination with specific embodiments.

[0029] As shown in Fig. Figure 1 A new type of composite inhibitor for coal mine, which is composed of the following components by weight: physical inhibitor 5% to 21%, chemical inhibitor 11% to 32%, synergist 5% to 15.6%, and the balance is deionized water.

[0030] In this embodiment, the physical inhibitor is urea, the chemical inhibitor is a mixture of tea polyphenol and luteolin in a ratio of 1-10:1, and the synergist is sodium chloride.

[0031] A preparation method of a new type of composite inhibitor for coal mine, comprising the following steps:

[0032] S1, material pre-arrangement, first adding physical inhibitor, chemical inhibitor and synergist into deionized water respectively to obtain physical inhibitor aqueous solution with a concentration of 15%-30%, chemical inhibitor aqueous solution with a concentration of 10%-40% and synergist aqueous solution with a concentration of 5%-10% respectively, and storing them independently;

[0033] S2, solution compounding, adding the physical inhibitor aqueous solution and the chemical inhibitor aqueous solution into a mixing mechanism, pre-mixing for 1-5 minutes under stirring, then adding the synergist aqueous solution into the mixed solution for secondary mixing, and continuously stirring and mixing for 30-40 minutes, to obtain the finished product of the composite inhibitor, and storing the obtained finished product of the composite inhibitor in a storage mechanism for standby use.

[0034] In the embodiment, in the step S2, the stirring speed is 1000-2000 r / min, and the environmental temperature during stirring and storage of the finished product of the composite inhibitor is 25-30℃.

[0035] In the embodiment, in use, the composite inhibitor is mixed with coal powder at a ratio of 1:2, and then left for 12 hours, and finally dried at a stable environment of 30-35℃ for 24 hours to obtain the inhibited coal sample.

[0036] It is specially noted that in the steps S1 and S2, the steps S1 and S2 are prepared in sequence through a batching system, wherein the batching system comprises a bearing frame 1, a main stirring and mixing tank 2, auxiliary mixing tanks 3, a water treatment device 4, a water storage tank 5, a material buffer tank 6, a metering pump 7 and a driving circuit 8, wherein the bearing frame 1 is a columnar frame structure with an axial section in the shape of "H", and an arrangement cavity 101 and a storage cavity 102 are arranged on the upper end surface and the lower end surface of the bearing frame 1 respectively, wherein the auxiliary mixing tanks 3 are embedded in the arrangement cavity 101 and connected with the bottom and the side wall of the arrangement cavity 101, and the auxiliary mixing tanks 3 are connected in parallel and communicated with the main stirring and mixing tank 2 through the metering pump 7 respectively, the main stirring and mixing tank 2 is embedded in the arrangement cavity 101 and connected with the bottom of the arrangement cavity 101 and distributed coaxially, and the main stirring and mixing tank 2 is communicated with the water storage tank 5 and the material buffer tank 6 through the metering pump 7 respectively, wherein the water storage tank 5 and the material buffer tank 6 are embedded in the storage cavity 102 and distributed around the axis of the bearing frame 1, the water storage tank 5 is communicated with the water treatment device 4, the water treatment device 4 is at least one and embedded in the bearing frame 1 corresponding to the bottom of the arrangement cavity 101 and the storage cavity 102, the driving circuit 8 is arranged on the outer side surface of the bearing frame 1, and the driving circuit 8 is electrically connected with the main stirring and mixing tank 2, the auxiliary mixing tanks 3, the water treatment device 4, the material buffer tank 6 and the metering pump 7 respectively.

[0037] Wherein, the main mixing tank 2, auxiliary mixing tank 3 and material buffer tank 6 include tank body 21, sealing cover 22, stirring mechanism 23, temperature sensor 24, electric heating mechanism 25, wherein the tank body 21 upper end surface and sealing cover 22 are connected and constitute a closed cavity structure with rectangular axial section, the tank body 21 bottom is provided with discharge port 26, sealing cover 22 is provided with at least one feed port 27, the discharge port 26 and feed port 27 are respectively communicated with metering pump 7 through flow guide pipe, and control valve 9 is arranged at the discharge port 26 and feed port 27, the electric heating mechanism 25 is at least two, embedded in the inner surface of the side wall of the tank body 21, and is evenly distributed around the axis of the tank body 21, the stirring mechanism 23 is embedded in the tank body 21, coaxially distributed with the tank body 21 and connected with the sealing cover 22, and the temperature sensor 24 is connected with the outer surface of the stirring mechanism 23, the stirring mechanism 23, temperature sensor 24, electric heating mechanism 25 and control valve 9 are electrically connected with driving circuit 8.

[0038] The stirring mechanism 23 includes guide column 231, ultrasonic oscillator 232 and spring 233, wherein the guide column 231 is a columnar structure with rectangular axial section, the upper end surface of which is connected with the sealing cover 22 and coaxially distributed with the sealing cover 22 and the tank body 21, the ultrasonic oscillator 232 is at least three, embedded in the guide column 231, coaxially distributed with the guide column 231 and evenly distributed along the axis direction of the guide column 231, each ultrasonic oscillator 232 independently operates, the distance between adjacent two ultrasonic oscillators 232 is not less than 10 cm, the spring 233 is a plate structure of any one of trapezoidal, fan-shaped and triangular shape, the rear end surface of each spring 233 is connected with the outer side surface of the guide column 231 through spring 234, each spring 233 is evenly distributed around the axis of the guide column 231, the outer side surface of the guide column 231 is connected with the temperature sensor 24, and the ultrasonic oscillator 232 is electrically connected with the driving circuit 8.

[0039] Further optimization, the distance between the rear end surface of the spring 233 and the outer side surface of the guide column 231 is 3-10 mm, the distance between the front end surface of the spring 233 and the side wall of the tank body 21 is 5-20 cm, the angle between the spring plate 233 and the axis of the guide column 231 is 30°-90°, and the distance between adjacent two springs 233 distributed from top to bottom along the axis of the guide column 231 is 1-10 cm.

[0040] In a further optimized configuration, the length of the guide post 231 is 50%-80% of the height of the tank body 21. The guide post 231 includes a column body 2311 and a disc spring 2312. There are several columns 2311, which are connected and coaxially distributed by the disc springs 2312. Each column body 2311 is a hollow columnar cavity structure with a rectangular axial cross section. The ultrasonic oscillator 232 is embedded in the column body 2311, and each ultrasonic oscillator 232 is located in an independent column body 2311. The distance between two adjacent columns 2311 is 5-10 mm.

[0041] To better understand and illustrate the technical content involved in this application, the technology involved in this application will now be fully explained in conjunction with specific embodiments and implementation results data:

[0042] Example 1

[0043] like Figures 4-8 As shown, a method for preparing a novel composite inhibitor for mining includes the following steps:

[0044] First, add 0.6g of urea, 0.9g of tea polyphenols, and 0.3g of luteolin to 10ml of deionized water to form solution 1. Finally, add 1.2g of sodium chloride to form a mixed solution.

[0045] The second step is to stir the mixed solution to obtain a uniformly mixed composite inhibitor.

[0046] In the second step, the stirring reaction is carried out at a speed of 1500 r / min for 30 to 40 minutes at a temperature of 25 to 30°C.

[0047] Simultaneously, this scheme is used to prepare inhibited coal samples using composite inhibitors:

[0048] Coal powder and composite inhibitor were mixed at a ratio of 1:2 and stirred for 12 hours. Finally, the mixture was dried for 24 hours to obtain the inhibited coal sample. The drying temperature was 30-35℃.

[0049] Example 2

[0050] A method for preparing and applying a novel composite inhibitor for mining includes the following steps:

[0051] Step 1: Add 1.2g of urea, 0.9g of tea polyphenols, and 0.6g of luteolin to 10ml of deionized water to form solution 1. Finally, add 1.2g of sodium chloride to form a mixed solution (solution 2).

[0052] Step 2: Stir the mixed solution to obtain a uniformly mixed composite inhibitor.

[0053] The stirring reaction in step 2 is stirred at a speed of 1500 r / min, the time is 30-40 min of stirring, and the temperature is 25-30 DEG C.

[0054] The composite inhibitor prepared by the scheme is applied to prepare an inhibited coal sample.

[0055] The coal powder and the composite inhibitor are mixed and stirred at a ratio of 1:2, placed for 12 h, and finally dried for 24 h to obtain the inhibited coal sample, and the drying temperature is 30-35 DEG C.

[0056] Example 3

[0057] A preparation method and application of a new composite inhibitor for mines include the following steps:

[0058] Step 1, urea 1.2 g, tea polyphenol 2.7 g, luteolin 0.3 g are added to 10 ml of deionized water to form solution 1, and finally 1.2 g of sodium chloride is added to form a mixed solution (solution 2).

[0059] Step 2, the mixed solution is stirred to obtain a uniformly mixed composite inhibitor.

[0060] The stirring reaction in step 2 is stirred at a speed of 1500 r / min, the time is 30-40 min of stirring, and the temperature is 25-30 DEG C.

[0061] The composite inhibitor prepared by the scheme is applied to prepare an inhibited coal sample.

[0062] The coal powder and the composite inhibitor are mixed and stirred at a ratio of 1:2, placed for 12 h, and finally dried for 24 h to obtain the inhibited coal sample, and the drying temperature is 30-35 DEG C.

[0063] Example 4

[0064] A preparation method and application of a new composite inhibitor for mines include the following steps:

[0065] Step 1, urea 1.8 g, tea polyphenol 0.9 g, luteolin 0.6 g are added to 10 ml of deionized water to form solution 1, and finally 1.2 g of sodium chloride is added to form a mixed solution (solution 2).

[0066] Step 2, the mixed solution is stirred to obtain a uniformly mixed composite inhibitor.

[0067] The stirring reaction in step 2 is stirred at a speed of 1500 r / min, the time is 30-40 min of stirring, and the temperature is 25-30 DEG C.

[0068] The composite inhibitor prepared by the scheme is applied to prepare an inhibited coal sample.

[0069] The coal powder and the composite inhibitor are mixed, stirred and placed for 12 hours at a ratio of 1:2, and finally dried for 24 hours to obtain the inhibited coal sample, with a drying temperature of 30-35°C.

[0070] Example 5

[0071] Step 1: Urea 1.2g, tea polyphenol 2.7g, luteolin 0.3g are added to 10ml of deionized water to form solution 1, and finally 1.2g of sodium chloride is added to form a mixed solution (solution 2).

[0072] Step 2: The mixed solution is stirred to obtain a uniformly mixed composite inhibitor.

[0073] In step 2, the stirring reaction is carried out at a stirring speed of 1500r / min, for a time of 30-40 minutes of stirring, and at a temperature of 25-30°C.

[0074] The composite inhibitor prepared by the present scheme is used to prepare an inhibited coal sample:

[0075] The coal powder and the composite inhibitor are mixed, stirred and placed for 12 hours at a ratio of 1:2, and finally dried for 24 hours to obtain the inhibited coal sample, with a drying temperature of 30-35°C.

[0076] As can be seen from the above examples, by changing the amount of urea, tea polyphenol, luteolin and sodium chloride added, composite inhibitors of different concentrations can be prepared.

[0077] Statistical analysis of the raw materials used in Examples 1-5 and the composite inhibitors prepared shows that:

[0078]

[0079] Then the inhibited coal sample and the raw coal sample are subjected to experimental study on the C600 coal spontaneous combustion heat characteristics.

[0080] 100mg of the inhibited coal sample and the raw coal of different concentrations are measured by a balance, placed in a reaction pool, and provided with air at a flow rate of 100ml / min. The starting temperature is set at 30°C, the final temperature is set at 300°C, and the temperature rising rate is 1°C / min. After preparation, the program is started and the experiment is performed. The heat flow values of the raw coal and the inhibited coal samples are obtained, and the specific data are as follows:

[0081] Raw coal Example 1 Example 2 Example 3 Example 4 Example 5 Heat flow (mW) 74.7 39.42 59.46 36.12 48.97 34.09

[0082] The heat flow inhibition rate is defined as the ratio of the difference between the maximum heat flow value of the coal sample treated by the inhibitor and the maximum heat flow value of the raw coal sample to the maximum heat flow value of the raw coal. The specific data are as follows:

[0083] Example 1 Example 2 Example 3 Example 4 Example 5 Heat flow suppression rate (%) 47.22 20.4 51.64 34.44 54.36

[0084] The temperature point at which the heat flow curve value is 0 is defined as T1, at which point the coal oxygen exothermic quantity is equal to the endothermic quantity, the oxidation exothermic reaches the acceleration stage, and the heat flow of each coal sample reaches 0 mW at the temperature point, and the specific data are as follows:

[0085] Raw coal Example 1 Example 2 Example 3 Example 4 Example 5 [T1] 122.87 153.08 154.98 160.33 164.89 159.09

[0086] The activation energy of the coal oxidation reaction can quantitatively characterize the reaction rate of the coal in the oxidation process, the lower the activation energy, the easier the coal oxidation reaction occurs, the faster the reaction rate, and the more obvious the exothermic characteristics, according to the Arrhenius law, the apparent activation energy of the coal is calculated, the fitting equation and the linear fitting correlation coefficient R of different embodiments are obtained, and 2 all are greater than 0.96, the fitting effect is good, and the specific data are as follows:

[0087]

[0088] According to the heat flow value, the heat flow inhibition rate, the characteristic temperature point T1, and the apparent activation energy of the raw coal and each coal sample, the heat flow value of the coal sample treated by the composite inhibitor is reduced to different degrees, the characteristic temperature point is higher than that of the raw coal, and the activation energy is improved to different degrees, which indicates that the composite inhibitor can effectively delay the time of the coal sample entering the oxidation stage, prolong the endothermic stage of the coal, reduce the oxidation exothermic quantity of the coal, increase the activation energy of the coal, and improve the difficulty of the coal-oxygen complex reaction, thereby inhibiting the oxidation exothermic of the coal. This is because the urea in the composite inhibitor has strong water absorption performance, the absorbed water enters the coal body through the coal cracks, blocks the coal body voids, prevents the penetration of oxygen, reduces the contact area between the coal and oxygen, and thus blocks the oxidation of the coal. In addition, the absorbed water can keep the coal body in a moist state for a long time, thereby achieving the purpose of absorbing the oxidation heat and reducing the reaction temperature. The chemical inhibitors tea polyphenol and luteolin can simultaneously capture free radicals generated in the chain reaction process, interrupt the chain transmission in the chain reaction process, or inactivate the active functional groups in the coal at low temperature oxidation, so as to generate a stable structure, increase the reaction activation energy of the oxidation reaction, increase the difficulty of the reaction, and thus inhibit the oxidation and spontaneous combustion of the coal with high spontaneous combustion tendency.

[0089] Compared with the prior art, the advantages of the present application are as follows:

[0090] (1) Overcoming the disadvantage that the single inhibitor has not obvious inhibition effect, the composite inhibitor has more excellent and significant inhibition effect.

[0091] (2) In the aspect of physical inhibition, the composite inhibitor has strong water absorption performance, the absorbed water enters the coal body through the coal cracks, prevents the penetration of oxygen, reduces the contact area between the coal and oxygen, thereby blocks the oxidation of the coal, and can keep the coal body in a moist state for a long time, reduces the reaction temperature, and prevents the coal from being further oxidized.

[0092] (3) In terms of chemical inhibition, composite inhibitors can react with free radicals in coal, chelate metal ions in coal, reduce catalytic effects, and play a dual role in preventing the generation of free radicals and interrupting the free radical chain reaction.

[0093] (4) The composite inhibitor can delay the initial exothermic temperature of coal and prolong the heat absorption stage of coal through synergistic inhibition, thereby inhibiting the spontaneous combustion reaction of coal.

[0094] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a novel composite inhibitor for mining, characterized in that: The preparation method of the novel composite inhibitor for mining includes the following steps: S1, Material pre-mixing: First, add physical inhibitors, chemical inhibitors, and synergists to deionized water to obtain physical inhibitor aqueous solutions with a concentration of 15%-30%, chemical inhibitor aqueous solutions with a concentration of 10%-40%, and synergist aqueous solutions with a concentration of 5%-10%, and store them separately. S2, solution compounding: add the aqueous solutions of physical inhibitor and chemical inhibitor to the mixing mechanism, premix for 1-5 minutes under stirring, then add the aqueous solution of synergist to the mixture for secondary mixing, and continuously stir and mix for 30-40 minutes to obtain the finished composite inhibitor, and store the finished composite inhibitor in the storage mechanism for later use. The preparation process involves sequentially performing steps S1 and S2 through a batching system. This system includes a support frame, a main mixing tank, auxiliary mixing tanks, a water processor, a water storage tank, a material buffer tank, a metering pump, and a drive circuit. The support frame is an H-shaped columnar frame structure with a configuration cavity and a receiving cavity coaxially distributed on its upper and lower ends, respectively. Several auxiliary mixing tanks are embedded within the configuration cavities and connected to the bottom and side walls of the cavities. These auxiliary mixing tanks are connected in parallel and are connected to the main mixing tank via metering pumps. The main mixing tank is embedded in the configuration cavity, connected to the bottom of the configuration cavity and coaxially distributed. The main mixing tank is also connected to a water storage tank and a material buffer tank via a metering pump. The water storage tank and the material buffer tank are both embedded in the receiving cavity and evenly distributed around the axis of the support frame. The water storage tank is also connected to a water processor. At least one water processor is embedded in the support frame corresponding to the bottom of the configuration cavity and the receiving cavity. The outer side of the support frame is provided with a drive circuit, and the drive circuit is electrically connected to the main mixing tank, the auxiliary mixing tank, the water processor, the material buffer tank, and the metering pump. Meanwhile, the new composite inhibitor for mining is composed of the following components by weight: 5%-21% physical inhibitor, 11%-32% chemical inhibitor, 5%-15.6% synergist, and the balance being deionized water; The physical inhibitor is urea; the chemical inhibitor is a mixture of tea polyphenols and luteolin in a ratio of 1-10:1; and the synergist is sodium chloride.

2. The preparation method of a novel composite inhibitor for mining according to claim 1, characterized in that: In step S2, the stirring speed is 1000-2000 r / min, and the ambient temperature during stirring and storage of the finished composite inhibitor is 25-30℃.

3. The preparation method of a novel composite inhibitor for mining according to claim 1, characterized in that: In use, the composite inhibitor is mixed with coal powder at a ratio of 1:2 and allowed to stand for 12 hours. Finally, the mixture is dried in a very stable environment at 30-35℃ for 24 hours to obtain an inhibited coal sample.

4. The preparation method of a novel composite inhibitor for mining according to claim 1, characterized in that: The main mixing tank, auxiliary mixing tank, and material buffer tank include a tank body, a sealing cover, a stirring mechanism, a temperature sensor, and an electric heating mechanism. The upper end face of the tank body is connected to the sealing cover to form a closed cavity structure with a rectangular axial cross-section. The bottom of the tank body is provided with a discharge port, and the sealing cover is provided with at least one inlet. Both the discharge port and the inlet are connected to a metering pump through guide pipes, and control valves are provided at both the discharge port and the inlet. There are at least two electric heating mechanisms, which are embedded in the inner surface of the side wall of the tank body and are evenly distributed around the axis of the tank body. The stirring mechanism is embedded in the tank body, coaxially distributed with the tank body, and connected to the sealing cover. At the same time, the temperature sensor is connected to the outer surface of the stirring mechanism. The stirring mechanism, temperature sensor, electric heating mechanism, and control valves are all electrically connected to the drive circuit.

5. The preparation method of a novel composite inhibitor for mining according to claim 4, characterized in that: The stirring mechanism includes a guide column, ultrasonic oscillators, and springs. The guide column is a columnar structure with a rectangular axial cross-section. Its upper end is connected to the sealing cap and is coaxially distributed between the sealing cap and the tank body. At least three ultrasonic oscillators are embedded in the guide column, coaxially distributed with the guide column, and evenly distributed along the axis of the guide column. Each ultrasonic oscillator operates independently, and the distance between two adjacent ultrasonic oscillators is not less than 10 cm. Several springs are included, each with a rectangular cross-section. The springs are plate-like structures that can be trapezoidal, sector-shaped, or triangular. The rear end face of each spring is connected to the outer side of the guide column via a spring. The springs are evenly distributed around the axis of the guide column. The outer side of the guide column is connected to a temperature sensor. All ultrasonic oscillators are electrically connected to a drive circuit.

6. The preparation method of a novel composite inhibitor for mining according to claim 5, characterized in that: The distance between the rear end face of the spring sheet and the outer side of the guide post is 3-10 mm, the distance between the front end face of the spring sheet and the side wall of the tank is 5-20 cm, and the spring sheet plate surface forms an angle of 30°-90° with the axis of the guide post. At the same time, the distance between two adjacent spring sheets distributed from top to bottom along the axis of the guide post is 1-10 cm.

7. The preparation method of a novel composite inhibitor for mining according to claim 5, characterized in that: The guide column is 50%-80% of the height of the tank. The guide column includes a column body and a disc spring. There are several columns, which are connected by disc springs and distributed coaxially. Each column is a hollow columnar cavity structure with a rectangular axial cross section. The ultrasonic oscillator is embedded in the column body, and each ultrasonic oscillator is located in an independent column body. The distance between two adjacent columns is 5-10 mm.

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