Composite gel fire prevention and extinguishment material for coal seam fire treatment and preparation method of composite gel fire prevention and extinguishment material

Abstract

The invention provides a composite gel fire preventing and extinguishing material for coal seam fire treatment and a preparation method. The composite gel fire preventing and extinguishing material comprises a first base material, a second base material, a solvent, a colloid material and an auxiliary agent, wherein in parts by weight, the first base material is 270-540 parts, the second base material is 90-180 parts, the colloid material is 15-30 parts, and the auxiliary agent is 30-60 parts; the mass ratio of the first base material to the solvent is 2: 5. The CO inhibition rate of the composite gel fire preventing and extinguishing material is good, moisture is rapidly vaporized at high temperature when part of the composite gel fire preventing and extinguishing material is not gelatinized, the surface temperature of a coal seam can be rapidly reduced, and dehydrated residual solids form an isolation layer to prevent coal oxygen contact; part of the composite gel fire preventing and extinguishing material enters a high-temperature area in a coal seam fire source through coal seam cracks, oxygen is isolated, coal is oxidized, and the exothermic reaction is terminated. The invention further provides a preparation method of the material. The preparation process is simple and low in process cost.

Description

Technical Field

[0001] The present application relates to the technical field of underground safety prevention and control in coal mines, and in particular to a composite gel fire-proofing and extinguishing material for coal seam fire control and a preparation method thereof. Background Art

[0002] When a coal seam spontaneously combusts, it decomposes and oxidizes at high temperatures to release a large amount of toxic and harmful gases. The high temperature of the spontaneous combustion of the coal seam causes the release of gas contained in the coal seam, which may cause a gas explosion. Therefore, the spontaneous combustion of the coal seam is extremely harmful. When a coal seam spontaneously combusts, the fire must be extinguished quickly and thoroughly.

[0003] At present, water or mud is used to extinguish spontaneous combustion of coal seams. For example, yellow mud grouting materials are used to extinguish spontaneous combustion of coal seams. However, after dehydration, the yellow mud grouting materials cannot fully fill the cracks, the effect of plugging air leakage is poor, and the overall consumption is large. For example, when water is used to extinguish fire, water has a certain promoting effect on the spontaneous combustion of coal, and at high temperatures, water will participate in the combustion reaction, produce a large amount of water gas, and cause water gas explosion. In addition, water or mud cannot be retained in the coal seam fire source. When it passes through the coal seam fire source, it only reduces the surface temperature there, while the internal temperature of the coal seam fire source is still very high and cannot achieve effective fire extinguishing or the probability of re-ignition is high. Therefore, how to provide a fire extinguishing material for coal seam fire control is a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] On the one hand, the present application proposes a composite gel fire extinguishing material for coal seam fire control. Through the compounding of thickener and cross-linking agent, the CO resistance rate of the composite gel fire extinguishing material is better. When some composite gel fire extinguishing materials are not gelled, the water vaporizes rapidly under high temperature conditions, which can quickly reduce the surface temperature of the coal seam. The dehydrated residual solid forms an isolation layer to hinder the contact between coal and oxygen; some composite gel fire extinguishing materials pass through the cracks in the coal seam and enter the high-temperature zone inside the fire source of the coal seam, isolating oxygen, and terminating the oxidation and exothermic reaction of the coal.

[0006] On the other hand, the present application proposes a method for preparing a composite gel fire extinguishing material for coal seam fire control. The preparation process has low cost, simple gelling process, is easy to apply on site and has strong scalability.

[0007] According to an embodiment of the first aspect of the present application, a composite gel fire extinguishing material for coal seam fire control is provided, comprising a first base material, a second base material, a solvent, a colloid material and an additive; wherein, by weight, the first base material is 270-540 parts, the second base material is 90-180 parts, the colloid material is 15-30 parts, and the additive is 30-60 parts; wherein the first base material comprises at least one of a silicate material, a silicon-based material or a water-hardening cement; the second base material is soil and / or coal-fired waste solids; and the colloid material comprises, by weight, 10-20 parts of a thickener and 5-10 parts of a cross-linking agent; The mass ratio of the first base material to the solvent is 2:5.

[0008] In some embodiments, the thickener includes at least one of hydroxymethyl cellulose, sodium polyacrylate, and polyacrylamide; And / or, the cross-linking agent comprises polyaluminium chloride.

[0009] In some embodiments, the auxiliary agent includes a coagulant, and the coagulant is an ammonium salt; the ammonium salt is selected from at least one of ammonium chloride, ammonium sulfate, and ammonium nitrate.

[0010] In some embodiments, the second base material is selected from at least one of fly ash, loess and coal gangue.

[0011] In some embodiments, the first base material is selected from at least one of water glass, sulphoaluminate cement, and silica fume.

[0012] In some embodiments, the solvent is an aqueous solution.

[0013] In some embodiments, the mass ratio of the second base material, the auxiliary agent and the colloid material is 6:2:1; And / or, the mass ratio of the first base material to the total amount of the colloid material, the auxiliary agent and the second base material is 2:1.

[0014] The composite gel fire extinguishing material for coal seam fire control in the embodiment of the present application uses the first base material, the second base material and the colloid material as the main raw materials, has a good CO resistance rate and stable gelling performance, enhances the adhesion of the composite gel fire extinguishing material, can effectively avoid the loss of the composite gel fire extinguishing material, and improves the use effect. At the same time, the good stability of the composite gel fire extinguishing material in the present application is not only non-toxic and harmless to the environment, but also non-corrosive to underground equipment. In addition, the composite gel fire extinguishing material has good permeability and can enter the interior of the loose coal seam; and it also has good high temperature resistance, will not vaporize quickly at high temperature, and has good heat absorption and cooling performance; finally, it also has certain plugging and chemical resistance, preventing coal from being oxidized again and reigniting.

[0015] According to an embodiment of the second aspect of the present application, a method for preparing a composite gel fire extinguishing material for coal seam fire control is proposed, comprising the following steps: Weighing raw materials according to chemical measurements and mixing them to obtain a colloidal material; Mixing the colloid material, the pretreated second base material and the additives according to the chemical measurement to obtain a mixed material; The mixed material, the solvent and the first base material are mixed uniformly according to stoichiometric amounts to obtain the material described in any of the above embodiments.

[0016] In some embodiments, the pretreatment method of the second base material includes drying, grinding and screening.

[0017] The preparation method of the embodiment of the present application has a simple process, and the colloid material and the mixed material are prepared by mixing technology, and finally the preparation of the composite gel fire extinguishing material is completed. The preparation process of the present application is low in cost, the gelling process is simple, it is easy to apply on site and has strong scalability.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 This is a flow chart for preparing a composite gel fire extinguishing material according to one embodiment of the present application; Figure 2 This is a fire extinguishing principle diagram of a composite gel fire extinguishing material according to an embodiment of the present application; Figure 3 is a crushed coal image according to an embodiment of the present application; Figure 4 yes Figure 3 Burning images of medium crushed coal; Figure 5 The composite gel fire extinguishing material according to one embodiment of the present application is used for Figure 4 Image of gelled coal sample after combustion of medium crushed coal. DETAILED DESCRIPTION

[0020] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be construed as limiting the present application. On the contrary, the present application includes all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0021] The technical solution of the embodiment of the present application provides a composite gel fire-proofing material and a preparation method for coal seam fire control. The composite gel fire-proofing material for coal seam fire control is non-toxic and harmless, does not corrode underground equipment, and does not pollute the environment. In addition, the composite gel fire-proofing material has good permeability and can enter the internal high-temperature zone of the loose coal body. When a part of it is not gelled, the water vaporizes rapidly under high temperature conditions, quickly reducing the surface temperature of the coal. The residual solid forms an isolation layer, which hinders the contact between coal and oxygen and further oxidation and spontaneous combustion. As the temperature of the coal body increases, the flowing part of the mixed liquid forms a colloid not far away and in the pores of the coal body, wrapping the coal body, isolating oxygen, and terminating the oxidation and exothermic reaction of the coal. Finally, the composite gel fire-proofing material has good high temperature resistance, does not vaporize rapidly at high temperatures, and has good heat absorption and cooling performance; and has certain plugging and chemical resistance, preventing the coal from being oxidized again and reigniting. When the coal seam spontaneously combusts, as the injection process continues, the scope of gelling continues to expand, the fire extinguishing circle increases, until the entire fire source is extinguished, and the completely dried colloid can also reduce the porosity of the original coal body, greatly reducing the amount of air passing through, thereby inhibiting the re-ignition of the coal seam. The preparation method of the composite gel fire extinguishing material for coal seam fire control has low preparation process cost, simple gelling process, is convenient for on-site application and has strong scalability.

[0022] "Scope" disclosed in the present application is limited in the form of lower limit and upper limit, and a given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a special range. The scope limited in this way can be including end values ​​or not including end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a scope. For example, if the scope of 60-120 and 80-110 is listed for a specific parameter, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following scope can be all expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "ab" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0023] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0024] To achieve the above-mentioned purpose, according to an embodiment of the first aspect of the present application, a composite gel fire extinguishing material for coal seam fire control is proposed, comprising a first base material, a second base material, a solvent, a colloid material and an additive; wherein, in parts by weight, the first base material is 270-540 parts, the second base material is 90-180 parts, the colloid material is 15-30 parts, and the additive is 30-60 parts; the mass ratio of the first base material to the solvent is 2:5.

[0025] The composite gel fire extinguishing material comprises, by weight, 270-540 parts of a first base material, 90-180 parts of a second base material, 15-30 parts of a colloid material, and 30-60 parts of an additive; wherein the first base material comprises at least one of a silicate material, a silicon-based material, or a water-hardening cement, and the exemplary first base material is selected from at least one of water glass, sulphoaluminate cement, and silica fume. In some embodiments, the weight proportion of the first base material is 300-500 parts, for example, in some embodiments, the weight proportion of the first base material is 270 parts, 280 parts, 290 parts, 300 parts, 310 parts, 320 parts, 330 parts, 340 parts, 350 parts, 360 parts, 370 parts, 380 parts, 390 parts, 400 parts, 410 parts, 420 parts, 430 parts, 440 parts, 450 parts, 460 parts, 470 parts, 480 parts, 490 parts, 500 parts, 510 parts, 520 parts, 530 parts, 540 parts, etc. The first base material can cover the surface of the loose coal body, block the gap between coal and rock, reduce the temperature of the fire area and fill and block the local air leakage channel, so as to achieve the purpose of fire extinguishing. When the proportion is large, the fluidity is poor and the gel performance is deteriorated; when the proportion is small, the fire extinguishing performance of the composite gel is poor.

[0026] In some embodiments, the second base material includes soil and / or coal waste solids. The exemplary second base material is selected from at least one of fly ash, loess and coal gangue. The second base material is loess, and its weight percentage is 100-150 parts. For example, in some embodiments, the weight percentage of the second base material is 90 parts, 100 parts, 110 parts, 120 parts, 130 parts, 140 parts, 150 parts, 160 parts, 170 parts, 180 parts, etc. The second base material plays a role of reinforcement and filling, and improves the use stability of the composite gel fire extinguishing material.

[0027] In some embodiments, 15-30 parts of the colloid material include 10-20 parts of a thickener and 5-10 parts of a crosslinking agent; wherein the thickener includes at least one of hydroxymethyl cellulose, sodium polyacrylate, and polyacrylamide; and the crosslinking agent includes polyaluminum chloride. For example, in some embodiments, the weight percentage of the thickener is 14-18 parts, for example, in some embodiments, the weight percentage of the thickener is 10 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc. The thickener can increase the adhesion of the composite gel fire extinguishing material, can effectively avoid the loss of the composite gel fire extinguishing material, and improve the use effect of the composite gel fire extinguishing material.

[0028] For example, in some embodiments, the weight proportion of the crosslinking agent is 5-8 parts, for example, in some embodiments, the weight proportion of the crosslinking agent is 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc. The role of the crosslinking agent is: the role of the crosslinking agent in the gel is to form a crosslinked structure in the gel, so that the physical properties of the gel become more stable and firm. They can promote the interaction between molecules, enhance the elasticity and durability of the gel, and improve its chemical stability and mechanical strength. In addition, the crosslinking agent can also control the pore size and shape of the gel, and adjust the adsorption and emission properties of the gel. When the crosslinking agent is large in number, the mechanical and adsorption properties of the composite gel fire extinguishing material are greatly affected.

[0029] In some embodiments, the auxiliary agent is selected from a coagulant, the coagulant is an ammonium salt, for example, the ammonium salt is selected from at least one of ammonium chloride, ammonium sulfate, and ammonium nitrate, and the weight proportion of the coagulant is 30-60 parts. For example, in some embodiments, the weight proportion of the auxiliary agent is 30 parts, 35 parts, 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 48 ​​parts, 49 parts, 50 parts, 60 parts, etc. The role of the auxiliary agent is to shorten the gelling and hardening time of the composite gel fire extinguishing material. When the proportion of the coagulant is large, the gelling time of the composite gel fire extinguishing material is too fast, and the internal fire extinguishing of the fire source cannot be achieved; when the proportion of the coagulant is small, the gelling time of the composite gel fire extinguishing material is too slow, and the isolation layer cannot be achieved to achieve CO isolation.

[0030] In some embodiments, the solvent is a water-soluble solution, such as water; the mass ratio of the first base material to the solvent is 2:5. The main functions of the water solvent: it plays a role in swelling and water retention during the preparation of the composite gel material; it has a significant cooling effect on the burning material. When the water solvent fraction is large, the composite gel system is unstable, which is not conducive to the preparation of the composite gel material, and when the water solvent fraction is large, the fluidity of the composite gel material is very strong, and the composite gel material is easy to lose; when the water solvent fraction is small, the fluidity of the composite gel material is poor, and the comprehensive fire prevention and extinguishing effect cannot be achieved.

[0031] In some embodiments, the mass ratio of the second base material, the auxiliary agent and the colloid material is 6:2:1; the mass ratio of the first base material to the colloid material, the auxiliary agent and the total amount of the second base material is 2:1.

[0032] The composite gel fire extinguishing material of the present application is added with a thickener and a cross-linking agent, and its CO resistance is better. When a part of the composite gel fire extinguishing material is not gelled, the water is rapidly vaporized under high temperature conditions, the surface temperature of the coal is quickly reduced, and the residual solid forms an isolation layer, which hinders the contact between coal and oxygen and further oxidation and spontaneous combustion. As the temperature of the coal body increases, the flowing part of the mixed liquid forms a colloid not far away and in the pores of the coal body, which wraps the coal body and isolates oxygen, so that the oxidation and exothermic reaction of the coal are terminated. As the injection process continues, the gelation range continues to expand, and the fire extinguishing circle increases until the entire fire source is extinguished. The completely dried colloid can also reduce the porosity of the original coal body, greatly reducing the amount of air passing through, thereby inhibiting re-ignition.

[0033] In addition, the composite gel fire-proof material in this embodiment is non-toxic and harmless, does not corrode underground equipment, and does not pollute the environment. At the same time, it has good permeability and can enter the interior of the loose coal body and has good high temperature resistance, and will not vaporize quickly at high temperatures; in addition, the composite gel fire-proof material has heat absorption and cooling performance and has certain plugging and chemical resistance, preventing coal from being oxidized again and reigniting.

[0034] According to the embodiment of the second aspect of the present application, a method for preparing a composite gel fire extinguishing material for coal seam fire control is proposed. Figure 1 , including the following steps: S1: weighing raw materials according to chemical measurements and mixing them to obtain a colloidal material; S2: mixing the colloid material, the pretreated second base material and the additives according to the chemical measurement to obtain a mixed material; S3: Mix the mixed material, the solvent and the first base material according to the stoichiometric ratio to obtain the material in any of the above embodiments.

[0035] In some embodiments, the pretreatment method of the second base material includes drying, grinding and screening.

[0036] In S1, according to the composition of the composite gel fire extinguishing material, raw materials are weighed and mixed according to chemical measurement to obtain a colloidal material, which is mixed evenly in a mixer to obtain a solid mixture. The uniform mixing in this embodiment uses a mixer and will not be repeated.

[0037] In S2, the colloid material obtained in S1, the pretreated second base material and the auxiliary agent are mixed, wherein the pretreatment method of the second base material includes drying, grinding and screening, that is, the second base material is dried, ground and screened, and then mixed with the colloid material and the auxiliary agent obtained in S1 in a mixer according to the above proportion to obtain a solid mixture; finally, in S3, the solid mixture obtained in S2, the solvent and the first base material are fully stirred and mixed in a mixer according to the above proportion to obtain a slurry.

[0038] The preparation method of the embodiment of the present application has a simple process, and the colloid material and the mixed material are prepared by mixing technology, and finally the preparation of the composite gel fire extinguishing material is completed. The preparation process of the present application is low in cost, the gelling process is simple, it is easy to apply on site and has strong scalability.

[0039] To facilitate further understanding of the present application, the scheme of the present application is further described below in conjunction with the embodiments. Those skilled in the art will understand that the description in the present application is only part of the examples, and any other suitable specific examples are within the scope of the present application.

[0040] Example 1 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 10 parts of a thickener and 5 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 90 parts of a second base material, 30 parts of an auxiliary agent and 15 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 270 parts of a first base material, 675 parts of a solvent and 135 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0041] Example 2 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 12 parts of a thickener and 8 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 120 parts of a second base material, 40 parts of an auxiliary agent and 20 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 360 ​​parts of a first base material, 900 parts of a solvent and 180 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0042] Example 3 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 12 parts of a thickener and 6 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 108 parts of a second base material, 36 parts of an auxiliary agent and 18 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 324 parts of a first base material, 810 parts of a solvent and 162 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0043] Example 4 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 14 parts of a thickener and 8 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 132 parts of a second base material, 44 parts of an auxiliary agent and 22 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 396 parts of a first base material, 990 parts of a solvent and 198 parts of a mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0044] Example 5 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 11 parts of thickener and 5 parts of cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 96 parts of the second base material, 32 parts of auxiliary agent and 16 parts of the colloid material, mix them evenly in a mixer to obtain a mixture, take 288 parts of the first base material, 720 parts of solvent and 144 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0045] Example 6 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 12 parts of a thickener and 5 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 102 parts of a second base material, 34 parts of an auxiliary agent and 17 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 306 parts of a first base material, 765 parts of a solvent and 153 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0046] Example 7 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 14 parts of a thickener and 5 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 114 parts of a second base material, 38 parts of an auxiliary agent and 19 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 342 parts of a first base material, 855 parts of a solvent and 171 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0047] Example 8 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 14 parts of a thickener and 7 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 126 parts of a second base material, 42 parts of an auxiliary agent and 21 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 378 parts of a first base material, 945 parts of a solvent and 189 parts of a mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0048] Example 9 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 16 parts of a thickener and 7 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 138 parts of a second base material, 46 parts of an auxiliary agent and 23 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 414 parts of a first base material, 1035 parts of a solvent and 207 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0049] Example 10 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 18 parts of a thickener and 6 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 144 parts of a second base material, 48 parts of an auxiliary agent and 24 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 432 parts of a first base material, 1080 parts of a solvent and 216 parts of a mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0050] Embodiment 11 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 20 parts of a thickener and 5 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 150 parts of a second base material, 50 parts of an auxiliary agent and 25 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 450 parts of a first base material, 1125 parts of a solvent and 225 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0051] Example 12 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 19 parts of a thickener and 7 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 156 parts of a second base material, 52 parts of an auxiliary agent and 26 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 468 parts of a first base material, 1170 parts of a solvent and 234 parts of a mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0052] Embodiment 13 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 18 parts of thickener and 9 parts of cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 162 parts of the second base material, 54 parts of auxiliary agent and 27 parts of the colloid material, mix them evenly in a mixer to obtain a mixture, take 486 parts of the first base material, 1215 parts of the solvent and 243 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0053] Embodiment 14 The present embodiment provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 20 parts of a thickener and 10 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 180 parts of a second base material, 60 parts of an auxiliary agent and 30 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 540 parts of a first base material, 1350 parts of a solvent and 270 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0054] Comparative Example 1 The present comparative example provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 15 parts of thickener and 15 parts of cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 180 parts of the second base material, 60 parts of auxiliary agent and 30 parts of the colloid material, mix them evenly in a mixer to obtain a mixture, take 540 parts of the first base material, 1350 parts of the solvent and 270 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0055] Comparative Example 2 The present comparative example provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: 12 parts of a thickener and 20 parts of a cross-linking agent are mixed evenly in a mixer to obtain a colloid material; 108 parts of a second base material, 36 parts of an auxiliary agent and 32 parts of a colloid material are mixed evenly in a mixer to obtain a mixture; 324 parts of a first base material, 810 parts of a solvent and 176 parts of a mixture are mixed evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0056] Comparative Example 3 The present comparative example provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 20 parts of thickener and 10 parts of cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 180 parts of the second base material, 60 parts of auxiliary agent and 30 parts of the colloid material, mix them evenly in a mixer to obtain a mixture, take 600 parts of the first base material, 1350 parts of the solvent and 270 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0057] Comparative Example 4 The present comparative example provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 20 parts of thickener and 10 parts of cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 180 parts of the second base material, 70 parts of auxiliary agent and 30 parts of the colloid material, mix them evenly in a mixer to obtain a mixture, take 540 parts of the first base material, 1350 parts of the solvent and 280 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0058] Comparative Example 5 The present comparative example provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 20 parts of a thickener and 10 parts of a cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 200 parts of a second base material, 60 parts of an auxiliary agent and 30 parts of a colloid material, mix them evenly in a mixer to obtain a mixture, take 540 parts of a first base material, 1350 parts of a solvent and 290 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0059] Comparative Example 6 The present comparative example provides a composite gel fire extinguishing material for coal seam fire control, and its preparation method and specific operating parameters are as follows: take 20 parts of thickener and 10 parts of cross-linking agent, mix them evenly in a mixer to obtain a colloid material; take 180 parts of the second base material, 60 parts of auxiliary agent and 30 parts of the colloid material, mix them evenly in a mixer to obtain a mixture, take 540 parts of the first base material, 1500 parts of the solvent and 270 parts of the mixture, mix them evenly in a mixer to obtain a slurry composite gel fire extinguishing material.

[0060] Experimental example The resistance rate is determined by the following method: (bare coal CO occurrence rate - sample CO occurrence rate) / bare coal CO occurrence rate = inhibition rate (%); wherein the CO occurrence rate is measured according to the traditional standard test method.

[0061] Application effect description: According to the composite gel fire extinguishing material of the above embodiment, take an open iron bucket, fill it with crushed coal and 50 kg of No. 0 diesel. Figure 3 As shown, it is placed 50 meters away from the mixing tank, where the crushed coal burns as Figure 4 As shown in the figure, the mixed composite gel was transported to the burning iron barrel through a rubber tube with an inner diameter of 10 cm using a thick slurry pump. After 3 minutes, the burning coal was completely extinguished. The gel coal sample after the crushed coal was burned was as shown in the figure. Figure 5 As shown, the fire extinguishing principle diagram of the composite gel fire extinguishing material is as follows Figure 2 shown.

[0062] For each embodiment, the present application adopts a pipe network type large flow glue injection process, utilizes the existing ground grouting fire prevention and extinguishing system of the coal mine, realizes large flow transportation of gel fire extinguishing materials, and finally realizes the implementation of large-scale fire prevention and extinguishing in the mine. The colloid injection equipment adopts ZM-5 / 18N colloid mud injection machine, which can be used alone or in conjunction with the ground grouting system to quickly eliminate large-scale mine fires. The CO resistance rate data of the composite gel fire prevention and extinguishing material in each embodiment is shown in Table 1.

[0063] Table 1 CO retardancy test results of composite gel fire extinguishing materials

[0064] It can be seen from the results in Table 1 that the composite gel fire-fighting material used for coal seam fire control in the present application has a high solid water content, the solidified body has good compressive resistance and load-bearing performance, and a long initial setting time, and can be transported for a long time. It meets the performance requirements of high-water materials for underground filling and fire prevention and extinguishing in coal mines, and has broad application prospects.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A composite gel fire extinguishing material for coal seam fire control, characterized in that: It comprises a first base material, a second base material, a solvent, a colloid material and an additive; wherein, by weight, the first base material is 270-540 parts, the second base material is 90-180 parts, the colloid material is 15-30 parts, and the additive is 30-60 parts; The first base material includes at least one of silicate material, silicon-based material or hydraulic cement; the second base material includes soil and / or coal waste solids; the colloid material includes 10-20 parts of thickener and 5-10 parts of cross-linking agent by weight; The mass ratio of the first base material to the solvent is 2:

5.

2. The material according to claim 1, characterized in that The thickener includes at least one of hydroxymethyl cellulose, sodium polyacrylate, and polyacrylamide; And / or, the cross-linking agent comprises polyaluminium chloride.

3. The material according to claim 1, characterized in that The auxiliary agent includes a coagulant, and the coagulant is an ammonium salt; The ammonium salt is selected from at least one of ammonium chloride, ammonium sulfate and ammonium nitrate.

4. The material according to claim 1, characterized in that The second base material is selected from at least one of fly ash, loess and coal gangue.

5. The material according to claim 1, characterized in that The first base material is selected from at least one of water glass, sulphoaluminate cement and silica fume.

6. The material according to claim 1, characterized in that The solvent is a water-soluble solution.

7. The material according to any one of claims 1 to 6, characterized in that The mass ratio of the second base material, the auxiliary agent and the colloid material is 6:2:1; And / or, the mass ratio of the first base material to the total amount of the colloid material, the auxiliary agent and the second base material is 2:

1.

8. A method for preparing a composite gel fire extinguishing material for coal seam fire control, characterized in that: The following steps are involved: Weigh the raw materials according to the chemical measurement and mix them to obtain the colloidal material; Mixing the colloid material, the pretreated second base material and the additives according to the chemical measurement to obtain a mixed material; The mixed material, the solvent and the first base material are mixed uniformly according to stoichiometric amounts to obtain the material described in any one of claims 1 to 7.

9. The preparation method according to claim 8, characterized in that The pretreatment method of the second base material includes drying, grinding and screening.

Images