Inorganic two-component grouting material for mines, preparation method and application thereof

Abstract

An inorganic two-component grouting material for mines, its preparation method, and its application, belong to the technical field of inorganic grouting materials. Component A and component B are composed in a weight ratio of 0.3 to 1.2:1. Component A includes ultrafine Portland cement, silica fume, an expander, a water reducer, a retarder, lithium carbonate, a cellulose ether, a defoamer, and latex powder; component B includes sulfoaluminate cement, slag, an expander, a water reducer, lithium carbonate, a cellulose ether, a defoamer, latex powder, and a retarder. The weight ratio of slag to sulfoaluminate cement is 3.5 to 5.6:1, and the weight ratio of ultrafine Portland cement to sulfoaluminate cement is 2.5 to 4:1. The inorganic two-component grouting material for mines of the present invention can solidify rapidly and has the functions of water blocking and reinforcement.

Description

Technical Field

[0001] The invention belongs to the technical field of inorganic grouting materials, and in particular relates to an inorganic two-component grouting material for mines, a preparation method and an application thereof. Background Art

[0002] Currently, the country is paying increasing attention to mine safety and has placed more stringent requirements on organic materials used in mines. The government has successively issued laws and regulations such as the "Safety Management Measures for Reactive Polymer Materials in Coal Mines (Trial Implementation)" and released the "AQ / T1087-2020 Polymer Materials for Coal Mine Water Blockage" and the "AQ / T1089-2020 Polymer Materials for Coal Mine Rock Reinforcement." At the same time, organic materials themselves have problems such as excessively high reaction temperatures, insufficient flame retardancy, and limited application specificity. These are the main causes of secondary disasters caused by underground polymer grouting reinforcement materials. Therefore, the development and application of inorganic materials for mining has become an urgent problem that technicians in this field need to solve.

[0003] At present, most mines use chemical grouting materials. Existing chemical grouting materials have the disadvantages of slow solidification speed and strength failure during use, which leads to re-fracture and leakage of tunnels; the reaction temperature is too high, which poses certain safety hazards; organic grouting materials, such as "Marisan", will cause environmental pollution. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to overcome the shortcomings of the existing technology and provide an inorganic two-component grouting material for mines and its preparation method and application. The inorganic two-component grouting material for mines of the present invention can solidify quickly and has the effects of water blocking and reinforcement.

[0005] The technical solution adopted by the present invention to solve the technical problem is: the components A and B are composed in a weight ratio of 0.3-1.2:1, wherein the component A comprises the following components in parts by weight: 45-60 parts of ultrafine silicate cement, 39-54 parts of silica fume, 0.05-0.2 parts of plastic expansion agent, 0-0.2 parts of water reducer, 0.05-0.15 parts of retarder, 0.02-0.05 parts of lithium carbonate, 0.01-0.07 parts of cellulose ether, 0.1-0.22 parts of defoaming agent and 0.3-0.6 parts of latex powder; the component B comprises The invention comprises the following components in parts by weight: 15-22 parts of sulphoaluminate cement, 77-84 parts of slag, 0.1-0.3 parts of plastic expansion agent, 0-0.2 parts of water reducer, 0.05-0.15 parts of lithium carbonate, 0.02-0.05 parts of cellulose ether, 0.01-0.07 parts of defoaming agent, 0.25-0.47 parts of latex powder and 0.1-0.2 parts of retarder; and at the same time, the weight ratio of ultrafine slag powder to sulphoaluminate cement is controlled to be 3.5-5.6:1, and the weight ratio of ultrafine Portland cement to sulphoaluminate cement is controlled to be 2.5-4:1.

[0006] Preferably, the weight ratio of component A to component B is 0.5~1:1; the initial setting time of the inorganic two-component grouting material for mines is 31s, the final setting time is 50s, the compressive strength after 1 day is 32.5MPa, and the compressive strength after 3 days is 46MPa.

[0007] The strength grade of the sulphoaluminate cement is ≥42.5MPa, and the sulphoaluminate cement has the characteristics of high early strength, high frost resistance, corrosion resistance, high impermeability, expansion performance and low alkalinity.

[0008] Silica powder is ultrafine silica powder with a fineness of 2000 mesh. Adding an appropriate amount of ultrafine silica powder while ensuring compressive strength can reduce the amount of cement used, thereby reducing pollution to the environment and reducing costs.

[0009] The slag is ultrafine slag powder, composed of 30wt% fly ash and 70wt% slag powder, with a fineness of 900 mesh. Ultrafine slag powder can shorten the setting time. Lithium carbonate can increase the early compressive strength and shorten the setting time.

[0010] The specific surface area of ​​the ultrafine Portland cement is 1990~2010m 2 / kg, average particle size is D50=3µm, D95=6.5µm, fineness is 1500~1800 mesh; the preferred specific surface area is 2000m 2 / kg. Within the 1500-1800 mesh range, larger mesh sizes indicate greater fineness, shorter initial setting time, and improved compressive properties. Ultrafine Portland cement has excellent permeability, and the resulting slurry exhibits excellent fluidity and diffusivity. By leveraging its superior particle distribution and flexural and compressive properties, it significantly increases compressive strength. Its setting time can also be adjusted to meet specific project requirements.

[0011] The expansion agent is a plastic expansion agent, which is azodicarbonamide or azobisisobutyronitrile. The plastic expansion agent causes volume expansion through physical and chemical reactions, can compensate for the shrinkage value of the material itself, and can avoid the structure, function and appearance of the material being affected by shrinkage and cracking.

[0012] The water reducer is a polycarboxylate superplasticizer; the defoamer is a polyether defoamer; and the retarder is tartaric acid or boric acid. The polycarboxylate superplasticizer reduces water consumption and improves compressive strength. It functions in grouting materials by dispersing, improving fluidity, and enhancing performance. Its unique comb-shaped molecular structure helps improve the uniformity and fluidity of the grouting material by dispersing. It also reduces the solid-liquid interfacial energy of the slurry, improving the thermodynamic stability of the system, thereby enhancing the dispersion of cement particles and improving the fluidity of the grouting material. It significantly reduces water consumption while improving the compressive strength and durability of concrete. Polycarboxylate superplasticizer is a green, environmentally friendly material that is non-flammable, non-explosive, and safe to transport, making it suitable for use in various projects. The polyether defoamer dissipates heat and gases generated by the hydration reaction, preventing bubbles from forming after the material sets, thereby ensuring effective sealing and ensuring the workability and weight of the grouting agent. The retarder improves setting time and ensures fluidity.

[0013] The cellulose ether is hydroxyethyl cellulose ether or methyl cellulose. Cellulose ether is a water-soluble polymer that can shorten the curing time, reduce the water loss shrinkage rate and improve the compressive strength; it can also reduce the water loss shrinkage rate of the grouting material.

[0014] The latex powder is at least one of ethylene and vinyl acetate copolymer and acrylate and styrene copolymer; the ethylene and vinyl acetate copolymer is a redispersible latex powder, and the redispersible latex powder and the inorganic gelling material constitute an ideal bonding system. Each component brings its own performance and complements each other's strengths and weaknesses, together forming a performance that cannot be achieved by using redispersible rubber powder and cement alone, thereby improving bonding strength, cohesion, impact resistance, wear resistance, water retention, workability, reducing water absorption, enhancing flexural strength and enhancing durability.

[0015] The latex powder is composed of an ethylene-vinyl acetate copolymer and an acrylate-styrene copolymer in a weight ratio of 4 to 9:1. The combined use of these two components creates a synergistic effect. The ethylene-vinyl acetate copolymer provides excellent flexibility and enhances the material's ability to adapt to deformation, while the acrylate-styrene copolymer improves water resistance and mechanical strength. This ratio, through the complementary polymer segments, achieves the synergistic improvement in adhesion and mechanical strength described in this application.

[0016] According to another aspect of the present invention, there is also provided a method for preparing an inorganic two-component grouting material for mines, comprising the following steps:

[0017] (1) Ultrafine Portland cement, ultrafine silica fume, plastic expansion agent, water reducer, tartaric acid, lithium carbonate, cellulose ether, defoaming agent and latex powder are uniformly mixed to obtain component A;

[0018] (2) Sulphoaluminate cement, ultrafine slag powder, plastic expansion agent, water reducer, lithium carbonate, cellulose ether, defoamer, latex powder, and boric acid retarder are mixed uniformly to obtain component B;

[0019] The obtained component A and component B are inorganic two-component grouting materials for mines.

[0020] Step (1) First, ultrafine silicate cement and ultrafine silica powder are weighed by a spiral metering scale and then mixed into a twin-shaft mixer with a diameter of more than 500 mm and a length of more than 3500 mm, and stirred at a rate of 100 r / min for 45 to 50 minutes; during the stirring process, the aeration box at the bottom of the mixer is turned on, and the Roots blower is turned on to suspend the materials and fully homogenize them; thereby obtaining the semi-finished product of material A. The plastic expansion agent, water reducer, tartaric acid, lithium carbonate, cellulose ether, defoaming agent and latex powder are weighed by an electronic scale and then mixed into the mixer and stirred at a rate of 120 r / min for 3 to 5 minutes to obtain the material additive A. The twin-shaft mixer is started, and the semi-finished material A and the material additive A are added into the twin-shaft mixer and mixed thoroughly, and an aeration box is installed at the bottom of the mixer, and the Roots blower is turned on to suspend the materials and fully homogenize them, and stirred at a rate of 100 r / min for 30 to 35 minutes; thereby obtaining component A.

[0021] Step (2) First, sulphoaluminate cement and ultrafine slag powder are weighed by a spiral weighing scale and then mixed into a twin-shaft mixer with a diameter of more than 500 mm and a length of more than 3500 mm, and stirred at a rate of 100 r / min for 45 to 50 minutes; during the stirring process, the aeration box at the bottom of the mixer is turned on, and the Roots blower is turned on to suspend the materials and fully homogenize them; thereby obtaining the semi-finished material B. The plastic expansion agent, water reducer, lithium carbonate, cellulose ether, defoamer, latex powder, and boric acid retarder are weighed by an electronic scale and then mixed into the mixer and stirred at a rate of 120 r / min for 3 to 5 minutes to obtain the material B additive. The twin-shaft mixer is started, and the semi-finished material B and the material B additive are added to the twin-shaft mixer and mixed thoroughly. The aeration box is installed at the bottom of the mixer, and the Roots blower is turned on to suspend the materials and fully homogenize them, and stirred at a rate of 100 r / min for 30 to 35 minutes; thereby obtaining the B component.

[0022] The reaction temperature during the preparation of the inorganic two-component grouting material for mines is lower than 50°C. Step (2) firstly mix 30wt% of fly ash and 70wt% of slag powder, and pass through a 900-mesh sieve to obtain ultrafine slag powder; then, sulphoaluminate cement, ultrafine slag powder, plastic expansion agent, water reducer, lithium carbonate, cellulose ether, defoamer, latex powder, and boric acid retarder are mixed to obtain component B.

[0023] Components A and B solidify quickly after mixing. When stopping grouting, stop one component first and continue grouting the other component for two minutes to prevent the mixture from clogging the grouting pipe. Clean the equipment promptly after grouting. When using inorganic two-component grouting materials for mines on site, in order to maintain their performance and avoid safety hazards, it is strictly forbidden to add any admixtures or additives.

[0024] According to another aspect of the present invention, the present invention also provides the application of the above-mentioned inorganic two-component grouting material or the inorganic two-component grouting material for mines prepared by the above-mentioned preparation method in the rapid reinforcement of broken coal and rock masses, the rapid repair of caving areas or the advanced reinforcement project during coal mining.

[0025] The two-component grouting material comprises component A and component B in a weight ratio of 0.3 to 1.2:1. Component A and component B are weighed according to the weight ratio. Component A is mixed with water, and component B is mixed with water to obtain component A and component B mixtures, respectively. The component A and component B mixtures are then mixed evenly and used for grouting. The water-cement ratio of component A is 0.2 to 0.5:1, and the water-cement ratio of component B is 0.2 to 0.5:1. The addition of a water reducer can shorten the setting time and increase the compressive strength. A higher water content results in a longer setting time and lower compressive strength, so the water-cement ratio can be reduced without affecting performance.

[0026] Packaging, transportation and storage:

[0027] It is packaged in three-layer laminated ziplock bags, 25kg / bag, with a shelf life of 6 months.

[0028] It must be stored in a dry and ventilated room with the packaging bag tightly sealed, and protected from moisture, freezing and water.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. In the present invention, the weight ratio of component A to component B is 0.3-1.2:1, and the weight ratio of ultrafine slag powder to sulphoaluminate cement is controlled to be 3.5-5.6:1, and the weight ratio of ultrafine Portland cement to sulphoaluminate cement is controlled to be 2.5-4:1. The initial setting time is controlled to make it solidify quickly, and it has the effects of water blocking and reinforcement.

[0031] 2. The water-cement ratio of components A and B of the present invention is between 0.2 and 0.5:1. By adding a water reducer, the setting time can be shortened and the compressive strength can be improved.

[0032] 3. The inorganic two-component grouting material for mines of the present invention has low reaction temperature, high compressive strength and low environmental pollution.

[0033] 4. The inorganic two-component grouting material for mines of the present invention is simple to operate and easy to use, can improve the working environment of miners and ensure mining safety. DETAILED DESCRIPTION

[0034] Example 12 is the best embodiment of the present invention. The present invention will be further described below in conjunction with specific examples and comparative examples.

[0035] The chemical additives used in the examples and comparative examples of the present invention are all commercially available, and their specific information is as follows:

[0036] Ultrafine silicate cement: industrial grade, purchased from Shandong Donghua Technology Co., Ltd.; ultrafine silica fume: industrial grade, Zibo Shengquan Cement Plant; azodicarbonamide: industrial grade, Jinan Yeqing Biotechnology Co., Ltd.; azobisisobutyronitrile: industrial grade, Jinan Quansheng Chemical Co., Ltd.; carboxylic acid water reducer: industrial grade, purchased from Shandong Bofei Cement Technology Service Co., Ltd.; tartaric acid: industrial grade, purchased from Nanjing Yaojie Energy Saving Technology Co., Ltd.; lithium carbonate: industrial grade, purchased from Shandong Suihua Biotechnology Co., Ltd.; hydroxyethyl cellulose ether: industrial grade, purchased from Jiangsu Runfeng Synthesis Technology Co., Ltd.; polyether defoamer: industrial grade, purchased from Shandong Yuquan New Materials Technology Co., Ltd.; latex powder is vinyl acetate copolymer: industrial grade, purchased from Shandong Kaimaoxing Chemical Co., Ltd.; latex powder is acrylic ester and styrene copolymer: industrial grade, purchased from Shandong Kaimaoxing Chemical Co., Ltd.; sulphoaluminate cement: industrial grade, purchased from Qiyin Cement Plant Co., Ltd.; ultrafine slag powder: industrial grade, purchased from Shandong Jingshi New Materials Co., Ltd.; boric acid: industrial grade, purchased from Jinan Shiji Tongda Chemical Co., Ltd.

[0037] Examples 1 to 53

[0038] A method for preparing an inorganic two-component grouting material for mines comprises the following steps:

[0039] (1) Mix ultrafine silicate cement and ultrafine silica fume, and stir at a rate of 100 r / min for 45 min to 50 min to obtain a semi-finished product of component A; mix a plastic expansion agent, a water reducer, tartaric acid, lithium carbonate, cellulose ether, a defoaming agent, and latex powder, and stir at a rate of 120 r / min for 3 min to 5 min to obtain an additive of component A; then stir the semi-finished product of component A and the additive of component A at a rate of 100 r / min for 30 min to 35 min to mix uniformly; obtain component A;

[0040] (2) Mix sulphoaluminate cement and ultrafine slag powder, and stir at a rate of 100 r / min for 45 min to 50 min to obtain the semi-finished product of component B; mix the plastic expansion agent, water reducer, lithium carbonate, cellulose ether, defoamer, latex powder, and boric acid retarder, and stir at a rate of 120 r / min for 3 min to 5 min to obtain the additive of component B; then stir the semi-finished product of component B and the additive of component B at a rate of 100 r / min for 30 min to 35 min to mix evenly, and obtain component B;

[0041] Component A and component B are obtained respectively, which are inorganic two-component grouting materials for mines.

[0042] Table 1 Raw material composition (in parts by weight) of component A to component B in the embodiment with a weight ratio of 0.3:1

[0043] .

[0044] Table 2 Raw material composition (in parts by weight) of component A to component B in the embodiment with a weight ratio of 0.5:1

[0045] .

[0046] Table 3 Raw material composition (in parts by weight) of component A to component B in the embodiment with a weight ratio of 0.6:1

[0047] .

[0048] Table 4 Raw material composition (in parts by weight) of component A to component B in the embodiment with a weight ratio of 0.7:1

[0049] .

[0050] Table 5 Raw material composition (in parts by weight) of component A to component B in the embodiment with a weight ratio of 0.8:1

[0051] .

[0052] Table 6 Raw material composition (in parts by weight) of component A and component B in the embodiment with a weight ratio of 1:1

[0053] .

[0054] Table 7 Raw material composition (in parts by weight) of component A to component B in the embodiment with a weight ratio of 1.2:1

[0055] .

[0056] Table 8 Raw material composition (in parts by weight) of component A to component B in the embodiment with a weight ratio of 0.5:1

[0057] .

[0058] Comparative Example 1

[0059] The preparation method of the inorganic two-component grouting material for mines described in this comparative example is the same as that in Example 12, with the only difference being that the weight ratio of component A to component B is 0.1:1.

[0060] Comparative Example 2

[0061] The preparation method of the inorganic two-component grouting material for mines described in this comparative example is the same as that in Example 12, with the only difference being that the weight ratio of component A to component B is 1.5:1.

[0062] Comparative Example 3

[0063] The preparation method of the inorganic two-component grouting material for mines described in this comparative example is the same as that in Example 12, except that in step (1), 48 parts of ultrafine silicate cement and 51 parts of ultrafine silica powder are mixed, and in step (2), 24 parts of sulfoaluminate cement and 75 parts of ultrafine slag powder are mixed.

[0064] Comparative Example 4

[0065] The preparation method of the inorganic two-component grouting material for mines described in this comparative example is the same as that in Example 12, except that in step (1), 65 parts of ultrafine silicate cement and 34 parts of ultrafine silica powder are mixed, and in step (2), 13 parts of sulfoaluminate cement and 86 parts of ultrafine slag powder are mixed.

[0066] Performance Testing

[0067] The performance tests were conducted on the inorganic two-component grouting materials for mines prepared in the examples and comparative examples. The specific test results are shown in Tables 9, 10 and 11.

[0068] The setting time of inorganic two-component grouting material for mines is tested in accordance with GB / T1346-2011 "Test method for water consumption, setting time and stability of cement standard consistency".

[0069] The compressive strength of inorganic two-component grouting materials for mines is tested in accordance with GB / T17671-1999 "Test method for strength of cement mortar (ISO method)".

[0070] Table 9 Performance test results of Examples 1 to 30

[0071] .

[0072] Table 10 Performance test results of Examples 31 to 53

[0073] .

[0074] Table 11 Performance test results of comparative examples

[0075] .

[0076] In the present invention, the weight ratio of components A and B is 0.3 to 1.2:1. The weight ratio of ultrafine slag powder to sulphoaluminate cement is adjusted to 3.5 to 5.6:1, and the weight ratio of ultrafine Portland cement to sulphoaluminate cement is adjusted to 2.5 to 4:1. This controls the initial setting time for rapid solidification, while also providing water blocking and reinforcement. The water-cement ratio of components A and B is between 0.2 and 0.5:1, and the addition of a water reducer shortens the setting time and improves compressive strength.

[0077] In Example 50, 0 parts of water-reducing agent were added to Component A, resulting in a water-cement ratio of 0.5:1; 0 parts of water-reducing agent were added to Component B, resulting in a water-cement ratio of 0.5:1. The initial setting time was long and the compressive strength was low. In Example 51, 0.05 parts of water-reducing agent were added to Component A, resulting in a water-cement ratio of 0.4:1; 0.05 parts of water-reducing agent were added to Component B, resulting in a water-cement ratio of 0.4:1. The addition of the water-reducing agent reduced the water requirement, shortened the initial setting time, and increased the compressive strength. In Example 12, 0.1 parts of water-reducing agent were added to Component A, resulting in a water-cement ratio of 0.3:1; 0.1 parts of water-reducing agent were added to Component B, resulting in a water-cement ratio of 0.3:1. These conditions produced the shortest initial setting time. In Example 52, 0.15 parts of water-reducing agent was added to Component A, resulting in a water-cement ratio of 0.2:1; 0.15 parts of water-reducing agent was added to Component B, resulting in a water-cement ratio of 0.2:1; in Example 53, 0.2 parts of water-reducing agent was added to Component A, resulting in a water-cement ratio of 0.1:1; and 0.2 parts of water-reducing agent was added to Component B, resulting in a water-cement ratio of 0.1:1. Examples 52 and 53 show that excessive addition of water-reducing agent does not further shorten the initial setting time. A higher water-cement ratio results in a longer setting time and lower compressive strength. In Example 12, when the water-cement ratio of both Components A and B was 0.3:1, the shortest initial setting time was 31 seconds.

[0078] The results of Comparative Example 1 show that when the weight ratio of component A to component B is 0.1:1, the setting time is no longer shortened, and the compressive strength decreases. The results of Comparative Example 2 show that when the weight ratio of component A to component B is 1.5:1, the setting time increases, and the compressive strength decreases. The results of Comparative Examples 3 and 4 show that when the weight ratio of ultrafine slag powder to sulphoaluminate cement is adjusted to exceed the range of 3.5-5.6:1, and the weight ratio of ultrafine Portland cement to sulphoaluminate cement is adjusted to exceed the range of 2.5-4:1, the setting time increases, and the compressive strength decreases.

[0079] The inorganic two-component grouting material for mines of the present invention has low reaction temperature, high compressive strength and low environmental pollution; it is simple to operate and easy to use, can improve the working environment of miners and ensure mining safety.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other manner. Any person skilled in the art may utilize the above-disclosed technical content to modify or modify the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention remain within the scope of protection of the present invention.

Claims

1. An inorganic two-component grouting material for mines, characterized by: It is composed of component A and component B in a weight ratio of 0.3~1.2:1; The component A comprises the following components in parts by weight: 45-60 parts of ultrafine Portland cement, 39-54 parts of silica fume, 0.05-0.2 parts of plastic expansion agent, 0-0.2 parts of water reducer, 0.05-0.15 parts of retarder, 0.02-0.05 parts of lithium carbonate, 0.01-0.07 parts of cellulose ether, 0.1-0.22 parts of defoaming agent and 0.3-0.6 parts of latex powder; The B component comprises the following components in parts by weight: 15-22 parts of sulphoaluminate cement, 77-84 parts of slag, 0.1-0.3 parts of plastic expansion agent, 0-0.2 parts of water reducer, 0.05-0.15 parts of lithium carbonate, 0.02-0.05 parts of cellulose ether, 0.01-0.07 parts of defoamer, 0.25-0.47 parts of latex powder and 0.1-0.2 parts of retarder; the slag is ultrafine slag powder, composed of 30wt% fly ash and 70wt% slag powder, and its fineness is 900 mesh; The weight ratio of slag to sulphoaluminate cement is 3.5~5.6:1, and the weight ratio of ultrafine Portland cement to sulphoaluminate cement is 2.5~4:

1.

2. The inorganic two-component grouting material for mines according to claim 1, characterized in that: The component A comprises the following components in parts by weight: 45-57 parts of ultrafine silicate cement, 40-54 parts of silica fume, 0.05-0.2 parts of plastic expansion agent, 0.05-0.15 parts of water reducer, 0.05-0.15 parts of retarder, 0.02-0.05 parts of lithium carbonate, 0.01-0.05 parts of cellulose ether, 0.1-0.22 parts of defoamer and 0.4-0.6 parts of latex powder; the component B comprises the following components in parts by weight: 19-21 parts of sulphoaluminate cement, 78-80 parts of slag, 0.15-0.3 parts of plastic expansion agent, 0.05-0.15 parts of water reducer, 0.05-0.15 parts of lithium carbonate, 0.02-0.04 parts of cellulose ether, 0.01-0.05 parts of defoamer, 0.3-0.47 parts of latex powder and 0.1-0.2 parts of retarder.

3. The inorganic two-component grouting material for mines according to claim 1, characterized in that: The plastic expansion agent is azodicarbonamide or azobisisobutyronitrile.

4. The inorganic two-component grouting material for mines according to claim 1, characterized in that: The retarder is tartaric acid or boric acid.

5. The inorganic two-component grouting material for mines according to claim 1, characterized in that: The cellulose ether is hydroxyethyl cellulose ether or methyl cellulose.

6. The inorganic two-component grouting material for mines according to claim 1, characterized in that: The latex powder is at least one of ethylene and vinyl acetate copolymer and acrylic ester and styrene copolymer.

7. The inorganic two-component grouting material for mines according to claim 6, characterized in that: The latex powder is composed of ethylene and vinyl acetate copolymer and acrylic ester and styrene copolymer in a weight ratio of 4-9:

1.

8. The method for preparing an inorganic two-component grouting material for mines according to any one of claims 1 to 7, characterized in that: The steps include: (1) Mix ultrafine silicate cement, silica fume, plastic expansion agent, water reducer, tartaric acid, lithium carbonate, cellulose ether, defoamer and latex powder to obtain component A; (2) Sulphoaluminate cement, slag, plastic expansion agent, water reducer, lithium carbonate, cellulose ether, defoaming agent, latex powder and boric acid are mixed to obtain component B; Component A and component B are obtained respectively, which are inorganic two-component grouting materials for mines.

9. Use of the inorganic two-component grouting material according to any one of claims 1 to 7 or the inorganic two-component grouting material for mines prepared by the preparation method according to claim 8, characterized in that: It is used in the field of rapid reinforcement of broken coal and rock masses, rapid repair of caving areas, or advance reinforcement engineering during coal mining.

10. The use of an inorganic two-component grouting material for mines according to claim 9, characterized in that: The specific application method is as follows: the two-component grouting material consists of component A and component B in a weight ratio of 0.3~1.2:1; component A and component B are weighed according to the weight ratio; component A is mixed with water, and component B is mixed with water to obtain component A mixture and component B mixture respectively; the component A mixture and the component B mixture are then mixed evenly and used for grouting; the water-cement ratio of component A is 0.2~0.5:1; the water-cement ratio of component B is 0.2~0.5:1.