A high-water-fast-setting foaming material for fire prevention and extinguishing and its preparation method

Abstract

The present invention discloses a high-water-density, fast-setting foaming material for fire prevention and extinguishing, and a preparation method thereof. The material comprises components A, B, and C. Component A comprises sulfoaluminate cement, phosphogypsum, a setting accelerator A, a retarder, and a suspending agent in a mass ratio of 10:(2-4):0.03:0.05:0.05; component B comprises silicate cement, phosphogypsum, a setting accelerator B, a retarder, and a suspending agent in a mass ratio of 10:(1-3):0.03:0.05:0.05; and component C comprises a foaming agent and a foam stabilizer in a mass ratio of 1:0.01. Components A, B, and C are each first mixed with water at a water-cement ratio of (3-6):1, and then mixed with each other to form the high-water-density, fast-setting foaming material. The material not only has the dual effects of fire prevention and fire extinguishing, but also has the advantages of fast setting speed, strong consolidation ability, good air leakage blocking effect, the ability to stack vertically, and inerting the target fire zone, thereby ensuring the fire prevention and extinguishing effect in the mining area.

Description

Technical Field

[0001] The invention relates to a high-water-density quick-setting foaming material for fire prevention and extinguishing and a preparation method thereof, belonging to the technical field of coal mine fire prevention and extinguishing. Background Art

[0002] Fire is a serious safety concern in coal mining operations, making fire prevention and extinguishing crucial. Traditional fire prevention and extinguishing methods, including grouting, are simple to operate and low-cost, making them a common practice in coal mines. Technological advancements have led to the emergence of new fire prevention and extinguishing materials and technologies, such as cement-based fire extinguishing materials, polymer colloids, and composite colloid materials.

[0003] Mine fire prevention and extinguishing materials should possess both fire prevention and fire extinguishing properties, but commonly used fire prevention and extinguishing materials often only possess one of these capabilities. Existing cement-based materials, while effective at plugging air leaks and consolidating, offer good fire prevention properties. However, they suffer from poor inertization and only moderate cooling effects, resulting in poor fire extinguishing effectiveness. Polymer materials have a fast setting time and good wrapping properties, offering some fire extinguishing effectiveness. However, organic materials release a significant amount of heat during reactions, and since they are unlike rock wall materials, they lack cooling and consolidation properties, resulting in poor fire prevention. Composite colloidal materials offer good bonding, offering some fire prevention effectiveness, but their cooling effect is poor and their wrapping capacity is limited, resulting in only moderate fire extinguishing effectiveness.

[0004] To sum up, how to provide a high-water-speed setting foaming material for fire prevention and extinguishing and its preparation method, so that the material not only has the dual functions of fire prevention and fire extinguishing, but also has the advantages of fast setting speed, strong consolidation ability, good air leakage blocking effect, vertical stacking, and inerting target fire area, is one of the research directions of this industry. Summary of the Invention

[0005] In response to the problems existing in the above-mentioned prior art, the present invention provides a high-water-speed-setting foaming material for fire prevention and extinguishing and a preparation method thereof. The material not only has the dual functions of fire prevention and fire extinguishing, but also has the advantages of fast setting speed, strong consolidation ability, good air leakage blocking effect, and the ability to stack vertically and inert the target fire area, thereby ensuring the fire prevention and extinguishing effect in the mining area.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a high water-fast setting foaming material for fire prevention and extinguishing, comprising components A, B, and C;

[0007] The component A is composed of sulphoaluminate cement, phosphogypsum, accelerator A, retarder and suspending agent in a mass ratio of 10:(2-4):0.03:0.05:0.05;

[0008] The B component is composed of a mixture of silicate cement, phosphogypsum, accelerator B, retarder and suspending agent, with a mass ratio of 10: (1-3): 0.03: 0.05: 0.05;

[0009] The C component is composed of a mixture of a foaming agent and a foam stabilizer, with a mass ratio of 1:0.01;

[0010] Components A and B are mixed with water at a water-cement ratio of (3-6):1 to form a mixed solution of components A and B, and then the mixed solutions are mixed at a mass ratio of 1:(0.5-1) to prepare a high water-fast setting foam material for filling fire protection;

[0011] Components A, B, and C are mixed with water at a water-cement ratio of (3-6):1 to form a mixed liquid of components A, B, and C. The mixed liquids are then mixed at a mass ratio of 1:(0.5-1):(0.2-0.5) to prepare a high-water-fast-setting foaming material for fire extinguishing.

[0012] Furthermore, the accelerator A is a mixture of one or two of lithium carbonate and lithium chloride, and the accelerator B is a sulphoaluminate mineral, such as anhydrous calcium sulphoaluminate, calcium sulphoaluminate, etc., which is a mixture of one or more of them.

[0013] Furthermore, the retarder is a phosphate, and one or a combination of phosphates can be used, such as sodium dihydrogen phosphate.

[0014] Furthermore, the suspending agent is made of one or a mixture of hydroxypropyl methylcellulose and methylcellulose.

[0015] Furthermore, the pH value of the phosphogypsum is 1 to 3, and the fineness of the phosphogypsum particles is not less than 800 meshes.

[0016] Furthermore, the foaming agent is sodium bicarbonate.

[0017] Furthermore, the foam stabilizer is sodium dodecylbenzenesulfonate.

[0018] The preparation method of the high-water-fast-setting foaming material for fire prevention and extinguishing comprises the following specific steps:

[0019] (1) Screening the industrial waste phosphogypsum, removing the larger pieces of waste residue, selecting the phosphogypsum with a pH between 1 and 3 by water extraction, drying and grinding it to a size of 800 mesh or more, and setting it aside for later use;

[0020] (2) Preparation of component A: Grind the sulphoaluminate cement to a size of 800 mesh or more, add the sulphoaluminate cement, phosphogypsum, accelerator A, retarder and suspending agent into a dry mixer according to the required setting speed, set the speed at 1500 r / min, and stir for 5 min to ensure uniform mixing. After stirring, set aside for use;

[0021] (3) Preparation of component B: Grind the silicate cement to a size of 800 mesh or more, add silicate cement, phosphogypsum, accelerator B, retarder, and suspending agent into a dry mixer according to the required setting speed, set the speed at 1500 r / min, and stir for 5 min to ensure uniform mixing. After stirring, set aside for later use;

[0022] (4) Preparation of component C: Add the foaming agent and foam stabilizer to the dry mixer according to the ratio required for the foaming multiple, set the speed to 1000 r / min, stir for a certain time of 5 minutes, mix well and set aside for use;

[0023] (5) According to the expansion ratio requirements, stir and mix components A, B, and C separately according to the appropriate water-cement ratio at a stirring rate of 1000 r / min and a stirring time of 3 min to form a mixed solution of components A, B, and C;

[0024] (6) The mixed solution of components A, B, and C formed in step (5) is mixed and stirred for a certain period of time to form a high-water-fast-setting foaming material for filling fire prevention; or the mixed solution of components A, B, and C is mixed and stirred for a certain period of time to form a high-water-fast-setting foaming material for fire extinguishing.

[0025] The present invention uses multiple materials to cooperate and act with each other to form a high-water-density fast-setting foaming material. In the present invention, the accelerator A can increase the early setting time and strength of silicate cement, the accelerator B can increase the early setting time and strength of sulfoaluminate cement, the suspending agent increases the suspension degree of the main material in water, and the retarder can reduce the cement hydration during the early stage of the reaction. The calcium sulfate in the phosphogypsum can improve the cement performance, promote the hydration of clinker minerals, and increase the early strength. The phosphate group therein can react with sodium bicarbonate to produce carbon dioxide, which has an expansion effect on the material, and the expansion can generate an internal driving force to fill the entire space. The tiny particles form a dense skeleton of the inorganic material hydration product, thereby producing a good covering effect and strong consolidation ability. At the same time, the production of carbon dioxide can also reduce the oxygen content in the environment, thereby achieving the purpose of fire extinguishing. Under the combined action of the above materials, the material made by the present invention has the advantages of good air leakage blocking effect, strong consolidation ability, tight wrapping and covering, significant heat insulation and cooling, rapid setting and inerting of the target fire area. The details are as follows:

[0026] (1) The present invention has excellent fireproof performance. The main ingredient of this material is cement, which is an inorganic material. The reasonable proportion can make the heat generation during the reaction low. Since it has good similarity and compatibility with the rock wall, this material has a good effect of plugging air leakage, strong consolidation ability, and a certain strength and durability, so that it can completely isolate the dangerous area.

[0027] (2) The present invention has excellent fire extinguishing performance. The present invention can expand up to 12 times, and the material fineness is above 800 mesh. After the material is injected into the crack, the material reaction and expansion generate internal driving force, so that the material impregnates the rock wall. The tiny particles form a dense skeleton of inorganic material hydration products, thereby producing a good covering effect, strong consolidation ability and achieving foam stability; the water-cement ratio can be as high as 6:1, so that the material can provide sufficient cold exchange in the early stage of reaction and absorb more heat; the material is gray as a whole, which has the ability to block a certain amount of heat radiation, and the cement-based material itself has the ability to isolate heat conduction after solidification. These abilities enable the present invention to produce excellent heat insulation and cooling effects, cut off the continuous supply of fire zone, and achieve the purpose of rapid fire extinguishing in the early stage.

[0028] (3) The present invention can continuously produce fire prevention and extinguishing effects. Thorough fire extinguishing takes a certain amount of time to achieve. It is a dynamic process that requires systematic processing. The rapid fire extinguishing in the early stage, the excellent effect of plugging air leaks and the strong consolidation ability are to lay the foundation for the thorough fire extinguishing in the later stage. The carbon dioxide gas generated in the reaction process of the present invention can not only expand the material, but also penetrate into the fire extinguishing area, continuously reducing the oxygen content in the fire extinguishing area, and at the same time can maintain the stability of the foam, achieving the purpose of stabilizing the foam and not collapsing the foam, thereby having excellent inertization performance, so as to achieve the purpose of continuous fire extinguishing and fire extinguishing without rekindling.

[0029] (4) The present invention improves the utilization rate of waste phosphogypsum and reduces its environmental damage. The use of phosphogypsum can achieve multiple benefits at once. The calcium sulfate in it can promote the hydration process of cement, improve the performance of cement, promote the hydration of clinker minerals, and increase the early strength. The phosphate radical can react with sodium bicarbonate to produce carbon dioxide. The generated gas can cause the material to expand and later reduce the oxygen content in the environment, achieving the purpose of completely extinguishing the fire.

[0030] (5) This material can be used for both fire extinguishing and filling. When component C is not added, when components A and B are used at a water-cement ratio of 3:1, they lose fluidity within 1 minute and the final setting strength can reach 43 MPa. At this time, they can be used for filling. The material can still solidify in about 5 minutes at a water-cement ratio of up to 6:1, and has a certain strength. The reaction heat generation is very low. After adding component C, the carbon dioxide gas produced can make the material expand to 12 times, which can quickly expand to fill the entire space and isolate oxygen, greatly reducing the cost of fire extinguishing. When the fire extinguishing area on site is relatively fragmented, with many small cracks and serious air leakage, it is necessary to create a consolidation effect between the broken bodies, which will help to form the fire extinguishing area into a whole and prevent subsequent air leakage. At this time, components A and B are used. The high fluidity of the material in the early stage can make the slurry flow to each area, making the entire area airtight and having a certain strength, completely eliminating fires caused by air leakage; when the entire area is mainly composed of some larger cracks and has good integrity, components A, B, and C can be used at the same time. The strong impregnation ability enables the material to completely isolate the fire area, and it has the effect of expanding without collapsing bubbles, achieving a completely sealed effect, thereby having good continuous fire extinguishing efficiency and significantly reducing fire extinguishing costs.

[0031] (6) This material fully utilizes the characteristics of sulphoaluminate cement and silicate cement. Sulphoaluminate cement has the characteristics of high early strength, fast setting time, and good corrosion resistance, while silicate cement has the characteristics of high late strength and good durability. This material fully utilizes the characteristics of both cement materials, forming the characteristics of fast early flow loss time and no bubble collapse in the late expansion. After the material expands, it can completely adhere to the impregnated wall surface, fully isolate oxygen, and ultimately achieve the purpose of effective fire extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The figure is a flow chart of the preparation and use of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below.

[0034] First, the industrial waste phosphogypsum is screened and large impurities are discarded. The phosphogypsum with a pH value of 1 to 3 is obtained by water extraction. The phosphogypsum is dried and ground to above 800 mesh. At the same time, the sulfoaluminate cement and silicate cement are ground to above 800 mesh and set aside for use.

[0035] Example 1: It includes component A and component B, wherein the component A is specifically composed of 50 parts of sulphoaluminate cement, 20 parts of phosphogypsum, 0.15 parts of accelerator A, 0.25 parts of suspending agent and 0.25 parts of retarder in parts by mass, the accelerator A is lithium carbonate, the accelerator B is anhydrous calcium sulphoaluminate, and the suspending agent is hydroxypropyl methylcellulose; the component B is specifically composed of 50 parts of silicate cement, 15 parts of phosphogypsum, 0.15 parts of accelerator B, 0.25 parts of suspending agent and 0.25 parts of retarder in parts by mass, the accelerator A is lithium carbonate, the accelerator B is anhydrous calcium sulphoaluminate, and the suspending agent is hydroxypropyl methylcellulose.

[0036] The specific preparation steps are:

[0037] (1) Preparation of Component A: Add sulphoaluminate cement, phosphogypsum, accelerator A, retarder, and suspending agent according to the ratio of this embodiment to a dry mixer, set the speed at 1500 r / min, and stir for 5 minutes to ensure uniform mixing. After stirring, set aside for use;

[0038] (2) Preparation of Component B: Add Portland cement, phosphogypsum, accelerator B, retarder, and suspending agent according to the ratio of this embodiment to a dry mixer, set the speed at 1500 r / min, and stir for 5 minutes to ensure uniform mixing. After stirring, set aside for use;

[0039] When in use, components A and B are added to water respectively and stirred, with a water-cement ratio of 3:1, a stirring rate of 1000 r / min, and a stirring time of 3 minutes. The mixed liquids of components A and B are then mixed with each other. After mixing, the mixture is stirred at a stirring rate of 1000 r / min for 3 minutes. The reaction process is observed and various tests are performed. The specific data are shown in Table 1.

[0040] Example 2: The composition and preparation process of components A and B are the same as those of Example 1.

[0041] When in use, components A and B are added to water respectively and stirred, with a water-cement ratio of 6:1, a stirring rate of 1000 r / min, and a stirring time of 3 minutes. The mixed liquids of components A and B are then mixed with each other. After mixing, the mixture is stirred at a stirring rate of 1000 r / min for 3 minutes. The reaction process is observed and various tests are performed. The specific data are shown in Table 1.

[0042] Example 3: It includes component A, component B and component C, wherein the component A is specifically composed of 50 parts of sulfoaluminate cement, 20 parts of phosphogypsum, 0.15 parts of accelerator A, 0.25 parts of suspending agent and 0.25 parts of retarder in parts by mass, accelerator A is lithium carbonate, accelerator B is anhydrous calcium sulfoaluminate, and suspending agent is hydroxypropyl methylcellulose; the component B is specifically composed of 50 parts of silicate cement, 15 parts of phosphogypsum, 0.15 parts of accelerator B, 0.25 parts of suspending agent and 0.25 parts of retarder in parts by mass, accelerator A is lithium carbonate, accelerator B is anhydrous calcium sulfoaluminate, and suspending agent is hydroxypropyl methylcellulose; the component C is specifically composed of 25 parts of sodium bicarbonate and 0.25 parts of surfactant.

[0043] The specific preparation steps are:

[0044] (1) Preparation of Component A: Add sulphoaluminate cement, phosphogypsum, accelerator A, retarder, and suspending agent according to the ratio of this embodiment to a dry mixer, set the speed at 1500 r / min, and stir for 5 minutes to ensure uniform mixing. After stirring, set aside for use;

[0045] (2) Preparation of Component B: Add Portland cement, phosphogypsum, accelerator B, retarder, and suspending agent according to the ratio of this embodiment to a dry mixer, set the speed at 1500 r / min, and stir for 5 minutes to ensure uniform mixing. After stirring, set aside for use;

[0046] (3) Preparation of Component C: Add the foaming agent and foam stabilizer according to the ratio of this example into a dry mixer, set the speed to 1000 r / min, stir for 3 minutes, mix well, and set aside for later use;

[0047] When in use, components A, B, and C are added to water and stirred respectively, with a water-cement ratio of 3:1, a stirring rate of 1000 r / min, and a stirring time of 3 minutes. The mixed liquids of components A, B, and C are then mixed with each other. After mixing, the mixture is stirred at a stirring rate of 1000 r / min for 3 minutes. The reaction process is observed and various tests are performed. The specific data are shown in Table 1.

[0048] Example 4: The ingredients and preparation process of components A, B, and C are exactly the same as those in Example 3.

[0049] When in use, components A, B, and C are added to water and stirred respectively, with a water-cement ratio of 6:1, a stirring rate of 1000 r / min, and a stirring time of 3 min. Then, the mixed liquids of components A, B, and C are mixed with each other, and after mixing, stirred at a stirring rate of 1000 r / min for 3 min. The reaction process is observed and various tests are performed. The specific data are shown in Table 1.

[0050] Table 1 Test data of each embodiment

[0051]

[0052] As shown in Table 1, comparing Example 1 with Example 2 shows that, under all other conditions remaining the same, changing the water-cement ratio prolongs the time it takes for the material to lose fluidity, reduces material strength, and simultaneously reduces the heat generated by the reaction. Comparing Example 1 with Example 2, Example 3 and Example 4 show that adding component C effectively increases the material's expansion multiple, reduces the time it takes for the material to lose fluidity, reduces the heat generated by the reaction, and reduces the slurry viscosity, resulting in better fluidity. When this material uses only components A and B, it can serve as a filling material, achieving a final setting strength of up to 43 MPa, a fluidity loss time of only 45 seconds, and a water-cement ratio of up to 6:1. Despite 8 mL of water exudation, it still loses fluidity after 145 seconds. When all three components are used simultaneously, it can serve as a fire extinguishing material. Component C has an expansive effect on the material, reducing water exudation, and the material's expansion multiple can reach up to 12 times. It also reduces the time it takes for the material to lose fluidity and improves slurry fluidity. The entire reaction process generates low heat, significantly reducing fire extinguishing costs while ensuring fire extinguishing effectiveness.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high water fast-setting foaming material for fire prevention and extinguishing, characterized in that: Includes components A, B, and C; Component A is composed of a mixture of sulphoaluminate cement, phosphogypsum, accelerator A, retarder and suspending agent in a mass ratio of 10:(2-4):0.03:0.05:0.05; accelerator A is a mixture of one or both of lithium carbonate and lithium chloride; Component B is composed of a mixture of Portland cement, phosphogypsum, accelerator B, retarder and suspending agent in a mass ratio of 10: (1-3): 0.03: 0.05: 0.05; accelerator B is a sulphoaluminate mineral; Component C is composed of a mixture of a foaming agent and a foam stabilizer, with a mass ratio of 1:0.01; When the material is used for filling fireproofing, component C is not added. Components A and B are mixed with water at a water-cement ratio of (3-6):1 to form a mixture of components A and B. The mixtures are then mixed at a mass ratio of 1:(0.5-1) to obtain the mixture. When the high water-soluble quick-setting foaming material is used for fire extinguishing, the components A, B and C are mixed with water according to a water-cement ratio of (3-6):1 to form a mixed liquid of the components A, B and C. The mixed liquids are then mixed according to a mass ratio of 1: (0.5-1): (0.2-0.5) to prepare the high water-soluble quick-setting foaming material for fire extinguishing.

2. The high water-soluble quick-setting foaming material for fire prevention and extinguishing according to claim 1, characterized in that: The retarder is phosphate.

3. The high water-soluble quick-setting foaming material for fire prevention and extinguishing according to claim 1, characterized in that: The suspending agent is made of one of hydroxypropyl methylcellulose and methylcellulose or a mixture of the two.

4. The high water-soluble quick-setting foaming material for fire prevention and extinguishing according to claim 1, characterized in that: The pH value of the phosphogypsum is 1-3, and the fineness of the phosphogypsum particles is not less than 800 meshes.

5. The high water-soluble quick-setting foaming material for fire prevention and extinguishing according to claim 1, characterized in that: The foaming agent is sodium bicarbonate.

6. The high water-soluble quick-setting foaming material for fire prevention and extinguishing according to claim 1, characterized in that: The foam stabilizer is sodium dodecylbenzenesulfonate.

7. A method for preparing the high water-soluble quick-setting foaming material for fire prevention and extinguishing according to any one of claims 1 to 6, characterized in that: The specific steps are: (1) Screen the industrial waste phosphogypsum, remove the larger pieces of waste residue, select the phosphogypsum with a pH between 1 and 3 by water extraction, dry it, grind it to a size of more than 800 mesh, and set it aside for later use; (2) Preparation of component A: Grind the sulphoaluminate cement to a size of 800 mesh or more, add the sulphoaluminate cement, phosphogypsum, accelerator A, retarder and suspending agent into a dry mixer and stir for a certain time according to the setting speed requirements to ensure uniform mixing. After stirring, set aside for use; (3) Preparation of component B: Grind the silicate cement to a size of 800 mesh or above, add silicate cement, phosphogypsum, accelerator B, retarder and suspending agent into a dry mixer according to the required setting speed and stir for a certain time to ensure uniform mixing. After stirring, set aside for use; (4) Preparation of component C: Add the foaming agent and foam stabilizer into the dry mixer according to the ratio required for the foaming multiple, set the speed to 1000 r / min, stir for a certain time of 5 minutes, mix well and set aside for use; (5) According to the expansion ratio requirement, components A, B, and C are stirred separately for a certain period of time according to the appropriate water-cement ratio to form a mixed solution of components A, B, and C; (6) When the mixed liquid of components A, B and C formed in step (5) is used for filling fire prevention, the mixed liquid of components A and B is mixed and stirred for a certain period of time to form the required material; when the high water-fast setting foaming material is used for fire extinguishing, the mixed liquid of components A, B and C is mixed and stirred for a certain period of time to form the high water-fast setting foaming material for fire extinguishing.

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