A geopolymer material for mine tunnel sealing and preparation method thereof

Abstract

The present invention relates to the field of polymer material preparation, and in particular to a geopolymer material for mine tunnel plugging and a preparation method thereof, the method comprising: verifying the polymerization properties of the stage raw materials in the stirred sample by detecting the material characteristic differences of the stirred sample, obtaining the local temperature difference and the raw material sinking and floating area corresponding to each point; calculating the local polymerization tendency value based on the local temperature difference, the raw material sinking and floating area, and the material characteristic differences to determine the addition rate of the stage raw materials, adjusting the stirring speed, using ultrasonic detection equipment to perform longitudinal cyclic detection on the stirring device to determine whether there is local polymerization anomaly, restoring the initial stirring speed, repeating the above steps until all the stage raw materials are added to the stirring device, completing the stirring, and obtaining the target geopolymer material. The present invention improves the uniformity and plugging efficiency of the geopolymer material by detecting and adjusting the polymerization state during the stirring process.

Description

Technical Field

[0001] The present invention relates to the field of polymer material preparation, and in particular to a geopolymer material for mine tunnel sealing and a preparation method thereof. Background Art

[0002] Geopolymers, also known as inorganic polymers or mineral polymers, have become a hot topic in recent years due to their excellent sealing properties, environmental friendliness, and potential for solid waste recycling. Prepared from natural minerals or industrial solid waste using chemical activators, geopolymers are cementitious materials with a three-dimensional network structure. Geopolymers also possess excellent mechanical properties, high-temperature resistance, and corrosion resistance. They can replace Portland cement in the construction industry and have also demonstrated promising applications in the sealing and disposal of heavy metal and nuclear waste, as porous adsorption materials, and as high-performance composite materials.

[0003] Chinese patent authorization announcement number: CN110590205B discloses a method for preparing geopolymers. The method comprises the following steps: mixing fly ash, alkali residue and water and feeding the mixture into a wet ball mill; then adding a grinding aid into the wet ball mill for grinding to obtain slurry A; feeding zeolite powder and water into a wet ball mill for wet grinding to obtain slurry B; mixing slurry A and slurry B to obtain mixed slurry C; and adding sodium hydroxide and water glass into slurry C to obtain a fly ash geopolymer solid-liquid mixed slurry. The method solves the problem of chloride ion hazards in alkali residue in traditional processes, reduces the amount of strong alkali used, alleviates blooming, does not affect the performance of the water reducer, and has adjustable working performance. The prepared concrete product is superior to geopolymers prepared by traditional processes in terms of strength and durability.

[0004] Chinese Patent Authorization Publication No. CN108623199B discloses a method for preparing a geopolymer cementitious material and geopolymer mortar, comprising the following steps: drying and grinding fly ash for pretreatment; uniformly mixing the pretreated fly ash, slag powder, and a composite activator with a Si / Al molar ratio of 2.40-3.35, a Na / Si molar ratio of 0.30-0.50, and a Ca / Si molar ratio of no more than 0.95; adding mixing water at a mass ratio of (fly ash + slag powder) of 0.20-0.40 to form a slurry; pouring the slurry into a mold, curing the mold at a temperature of 20°C-80°C and a relative humidity of 50%-95% for 12-72 hours, and then demolding the molded specimens; and curing the demolded specimens to obtain a geopolymer cementitious material. This invention utilizes fly ash from municipal solid waste incineration and slag powder as cementitious components to produce a novel geopolymer material, achieving fly ash treatment and resource utilization.

[0005] However, the prior art still has the following problems:

[0006] The preparation of geopolymers usually involves the stirring and mixing of multiple raw materials. The properties of the raw materials vary, and the stirring process may lead to local polymerization, which in turn leads to poor uniformity of the final prepared material. Summary of the Invention

[0007] To this end, the present invention provides a geopolymer material for mine tunnel sealing and a preparation method thereof, so as to overcome the problem that the preparation of geopolymers in the prior art generally involves the stirring and mixing of multiple raw materials. The raw materials have different properties, and the stirring process may cause local polymerization, which in turn leads to poor uniformity of the final prepared material.

[0008] The present invention provides a method for preparing a geopolymer material for mine tunnel sealing, comprising:

[0009] Step S1, placing the initial stirring raw materials into a stirring device for stirring, and determining several stirring stage points;

[0010] Step S2, obtaining samples of the stirred material at the stirring stage, and detecting differences in material characteristics of the stirred material samples;

[0011] Step S3, determining the stage raw materials required to be added at the stirring stage point, and verifying the polymerization properties of the stage raw materials in the stirred sample. The verification process includes placing the stirred sample in an observation box, adding the stage raw materials to the surface of the stirred sample at different points, shaking the observation box, and obtaining the local temperature difference and the area of ​​the raw materials sinking and floating corresponding to each point;

[0012] Step S4, calculating the local polymerization tendency value based on the local temperature difference, the sinking and floating area of ​​the raw material, and the material characteristic difference, and obtaining the potential polymerization abnormality determination result of the stage stirring point;

[0013] Step S5, controlling process parameters based on the polymerization abnormality determination result, including determining the addition rate of the stage raw materials based on the local polymerization tendency value, adjusting the stirring speed, and adding the stage raw materials into the stirring device at the corresponding addition rate;

[0014] Step S6: Placing the ultrasonic detection equipment on a lifting frame to perform cyclic detection on several detection points in the longitudinal direction of the stirring device. Based on the differences in the ultrasonic signals at each detection point during the cyclic detection process, it is determined whether there is a local polymerization abnormality, and the initial stirring speed is restored;

[0015] Step S7, repeating steps S2 to S6 until all the raw materials in all stages are added to the stirring equipment, stirring is completed, and the target geopolymer material is obtained.

[0016] Furthermore, the process of detecting the material characteristic difference of the stirred sample includes:

[0017] The hardness tester continuously presses different parts of the stirred sample to obtain several material hardness characterization values;

[0018] Determine the variance of the hardness characterization values ​​of each of the materials as the material hardness difference value;

[0019] The transmittance meter continuously measures different parts of the stirred sample to obtain the transmittance of several materials;

[0020] Determining the variance of the light transmittance of each of the materials as the material homogeneity difference value;

[0021] A weighted sum of the material hardness difference value and the material homogeneity difference value is determined as a material characteristic difference characterization parameter.

[0022] Furthermore, the process of obtaining the local temperature difference corresponding to each point includes:

[0023] Determine the point temperature after oscillation at different points, and determine the temperature difference between the temperature at each point and the temperature of the stirred sample;

[0024] The average value of each temperature difference is determined as the local temperature difference.

[0025] Furthermore, the process of obtaining the sinking and floating areas of the raw materials corresponding to each point includes:

[0026] Determine the raw material area corresponding to the different points mentioned before the shock;

[0027] Determine the remaining raw material area corresponding to the different points after the shock;

[0028] The reduction amount of the raw material area at each different point is calculated, and the average value of the reduction amount of the raw material area is determined as the raw material sinking and floating area.

[0029] Furthermore, the process of calculating the local aggregation tendency value includes:

[0030] determining a ratio of the local temperature difference to a reference local temperature difference as a first aggregation factor;

[0031] Determine the ratio of the base raw material sinking and floating area to the raw material sinking and floating area as a second polymerization factor;

[0032] A weighted sum of the first aggregation factor, the second aggregation factor, and the material characteristic difference characterization parameter is determined as a local aggregation tendency value.

[0033] Furthermore, the potential polymerization anomaly determination result of the stirring point at the acquisition stage is:

[0034] If the local polymerization tendency value is greater than the local polymerization tendency value threshold, it is determined that there is a potential polymerization anomaly at the stirring point in the stage;

[0035] If the local polymerization tendency value is less than or equal to the local polymerization tendency value threshold, it is determined that there is no potential polymerization anomaly at the stirring point in the stage.

[0036] Furthermore, the speed of adding the raw materials in the stage is determined based on the local polymerization tendency value, wherein,

[0037] The addition rate of the raw materials in the stage is negatively correlated with the local polymerization tendency value.

[0038] Furthermore, the stirring speed is positively correlated with the local polymerization tendency value.

[0039] Furthermore, the process of determining whether there is a local aggregation anomaly includes:

[0040] Determine the variance of the ultrasonic signal corresponding to each detection point as the local abnormal characteristic value;

[0041] If the local abnormal characteristic value is greater than the reference local abnormal characteristic value, continue stirring;

[0042] If the local abnormal characteristic value is less than or equal to the reference local abnormal characteristic value, the initial stirring speed is restored.

[0043] Furthermore, the present invention also provides a method for preparing a geopolymer material for mine tunnel sealing, the geopolymer material comprising: pyrite slag, fly ash, cement, calcium-based bentonite, kaolin and a lime composite alkaline activator.

[0044] Compared with the prior art, the present invention has the beneficial effect of verifying the polymerization properties of the stirred sample, determining whether there is potential polymerization anomaly at the stage stirring point, and then adaptively controlling the process parameters, reducing the phenomenon of local polymerization during the stirring process, and improving the uniformity of the prepared geopolymer material.

[0045] In particular, the present invention obtains the stirring material samples at the stirring stage points, determines the material characteristic differences of the stirring material samples, and the material characteristic differences comprehensively characterize the uniformity of the stirring material in the stirring device from the dimensions of material hardness and material transmittance. In addition, the present invention verifies the polymerization properties of the stirring material samples to be added, including the local temperature difference and the area where the raw materials sink and float. In actual situations, the newly added stage raw materials may have different properties from the stirring material in the stirring device, and it is easy to produce local polymerization when the stage raw materials are initially added. For example, local reactions occur, resulting in local temperature differences, which lead to polymerization of the stage raw materials. In addition, the fluidity of the stage raw materials in the mixture also affects the generation of local polymerization. The tendency of the raw materials in the stage to diffuse is hindered due to the obstruction of fluidity. Under the promotion of local temperature difference, local polymerization is more likely to occur. Moreover, if the stirring material in the stirring equipment already has a certain degree of non-uniformity, the above phenomenon will be aggravated. Therefore, the present invention calculates the local polymerization tendency value based on the local temperature difference, the raw material sinking and floating area and the material characteristic difference obtained by the stirring material sample detection, characterizes the tendency of local polymerization to occur after the stage raw materials are added at the stirring stage point, provides data support for the subsequent acquisition of potential polymerization anomaly judgment results, facilitates the subsequent adaptive adjustment of process parameters, and thus reduces the phenomenon of local polymerization in the stirring process and improves the uniformity of the prepared geopolymer material.

[0046] In particular, the present invention adaptively adjusts the stirring speed and the addition speed of the stage raw materials, and timely intervenes in the process parameters when there is a potential polymerization anomaly. The addition speed and stirring speed are adaptively adjusted based on the local polymerization tendency value, thereby reducing the local polymerization phenomenon in the stirring process. Moreover, since local polymerization is most likely to occur when the stage raw materials are just added to the stirring equipment, at this stage, ultrasonic detection equipment is used to timely detect whether there is a local polymerization anomaly, and the adjusted process parameters are used to reduce the local polymerization phenomenon in the stirring process. Moreover, when the stirring is relatively stable, the initial stirring speed is restored, thereby saving energy and avoiding continuous rapid stirring. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flow chart of a method for preparing a geopolymer material for mine cave sealing according to the present invention;

[0048] Figure 2 It is a logic block diagram of the potential polymerization anomaly determination result of the stirring point in the acquisition stage of the present invention;

[0049] Figure 3 This is a logic block diagram for determining whether a local aggregation anomaly exists in the present invention. DETAILED DESCRIPTION

[0050] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0051] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0052] See also Figure 1 , Figure 1 The flowchart of the method for preparing a geopolymer material for mine tunnel plugging of the present invention is as follows:

[0053] Step S1, placing the initial stirring raw materials into a stirring device for stirring, and determining several stirring stage points;

[0054] Step S2, obtaining samples of the stirred material at the stirring stage, and detecting differences in material characteristics of the stirred material samples;

[0055] Step S3, determining the stage raw materials required to be added at the stirring stage point, and verifying the polymerization properties of the stage raw materials in the stirred sample. The verification process includes placing the stirred sample in an observation box, adding the stage raw materials to the surface of the stirred sample at different points, shaking the observation box, and obtaining the local temperature difference and the area of ​​the raw materials sinking and floating corresponding to each point;

[0056] Step S4, calculating the local polymerization tendency value based on the local temperature difference, the sinking and floating area of ​​the raw material, and the material characteristic difference, and obtaining the potential polymerization abnormality determination result of the stage stirring point;

[0057] Step S5, controlling process parameters based on the polymerization abnormality determination result, including determining the addition rate of the stage raw materials based on the local polymerization tendency value, adjusting the stirring speed, and adding the stage raw materials into the stirring device at the corresponding addition rate;

[0058] Step S6: Placing the ultrasonic detection equipment on a lifting frame to perform cyclic detection on several detection points in the longitudinal direction of the stirring device. Based on the differences in the ultrasonic signals at each detection point during the cyclic detection process, it is determined whether there is a local polymerization abnormality, and the initial stirring speed is restored;

[0059] Step S7, repeating steps S2 to S6 until all the raw materials in all stages are added to the stirring equipment, stirring is completed, and the target geopolymer material is obtained.

[0060] Specifically, the mixing stage point is the time node when the stage raw materials are added during the mixing process.

[0061] Specifically, the initial mixing raw material is a mixture of pyrite waste slag and fly ash, and the stage raw materials include calcium-based bentonite, kaolin, cement and lime composite alkaline activator.

[0062] Specifically, there is no limitation on the specific structure of the observation box. Preferably, for better observation, in implementation, the observation box can be a box with a transparent structure. When the observation box is shaken, the observation box can be placed on an shaking table to promote the contact between the stage raw materials and the stirring sample, so as to facilitate the observation of relative flow. This will not be repeated.

[0063] Specifically, the present invention does not limit the specific structure of the stirring equipment. It only needs to have a space for accommodating the stirring material and a stirring rod for stirring. The stirring speed needs to be adjustable. Those skilled in the art can choose according to their needs, which will not be repeated here.

[0064] Specifically, there is no limitation on the specific positions and numbers of different points. Preferably, in implementation, the surface of the stirred sample is divided into four areas of equal size, and the center position of each of the four areas is determined as the different points of adding raw materials in the stage. Those skilled in the art can also determine it according to actual conditions. It can be understood that in implementation, the surface of the stirred sample is not physically divided, but only based on mathematical division, and the surface of the stirred sample is not destroyed. This will not be repeated.

[0065] Specifically, the process of detecting the differences in material characteristics of the stirred samples includes:

[0066] The hardness tester continuously presses different parts of the stirred sample to obtain several material hardness characterization values;

[0067] Determine the variance of the hardness characterization values ​​of each of the materials as the material hardness difference value;

[0068] The transmittance meter continuously measures different parts of the stirred sample to obtain the transmittance of several materials;

[0069] Determining the variance of the light transmittance of each of the materials as the material homogeneity difference value;

[0070] A weighted sum of the material hardness difference value and the material homogeneity difference value is determined as a material characteristic difference characterization parameter.

[0071] Specifically, there is no limitation on the specific types of hardness testers and transmittance meters. For example, the hardness tester can be a handheld hardness tester, and the transmittance meter can be a visible light transmittance meter or a diffuse transmission transmittance meter. Of course, those skilled in the art can make a choice based on actual conditions. It is only necessary to ensure that the required data can be obtained. This will not be elaborated here.

[0072] Specifically, there is no limitation on the specific number of different parts. In practice, there are at least two different parts for detecting the material characteristics of the stirred sample, which will not be described in detail.

[0073] Specifically, the sum of the weight coefficients of the material hardness difference value and the material homogeneity difference value is 1, the weight coefficient of the material hardness difference value is 0.48, and the weight coefficient of the material homogeneity difference value is 0.52.

[0074] Specifically, the process of obtaining the local temperature difference corresponding to each point includes:

[0075] Determine the point temperature after oscillation at different points, and determine the temperature difference between the temperature at each point and the temperature of the stirred sample;

[0076] The average value of each temperature difference is determined as the local temperature difference.

[0077] Specifically, there is no limitation on the method of measuring the point temperature. Preferably, a non-contact temperature measuring device is used for measurement. For example, an infrared thermometer can be used for measurement. It is only necessary to ensure that the point temperature can be obtained, and this will not be elaborated.

[0078] Specifically, in implementation, the temperature of the stirred sample is measured using an infrared thermometer. By obtaining several temperatures at non-point locations of the stirred sample, the average temperature at non-point locations of the stirred sample is calculated, and the average temperature is determined as the stirred sample temperature. This will not be repeated here.

[0079] Specifically, the process of obtaining the sinking and floating areas of raw materials corresponding to each point includes:

[0080] Determine the raw material area corresponding to the different points mentioned before the shock;

[0081] Determine the remaining raw material area corresponding to the different points after the shock;

[0082] The reduction amount of the raw material area at each different point is calculated, and the average value of the reduction amount of the raw material area is determined as the raw material sinking and floating area.

[0083] Specifically, there is no limitation on the method of determining the stage raw material area and the remaining stage raw material area. For example, a high-definition camera can be set up for real-time shooting, the stage raw material outline and the remaining stage raw material outline can be marked, and the corresponding stage raw material area and the remaining stage raw material area can be calculated. This will not be repeated here.

[0084] It can be understood that the reduction in raw material area is the difference between the raw material area of ​​the stage and the raw material area of ​​the remaining stage.

[0085] Specifically, the present invention obtains the stirring material samples at the stirring stage points, determines the material characteristic differences of the stirring material samples, and the material characteristic differences comprehensively characterize the uniformity of the stirring material in the stirring equipment from the dimensions of material hardness and material transmittance. In addition, the present invention verifies the polymerization properties of the stirring material samples to be added, including the local temperature difference and the area where the raw materials sink and float. In actual situations, the properties of the newly added stage raw materials may be different from those of the stirring material in the stirring equipment, and it is easy to produce local polymerization in the initial addition stage of the stage raw materials. For example, local reactions occur, resulting in local temperature differences, which lead to polymerization of the stage raw materials. In addition, the fluidity of the stage raw materials in the mixture also affects the generation of local polymerization. The tendency of local polymerization is that the stage raw materials are not easy to diffuse due to the obstruction of fluidity. Under the promotion of local temperature difference, local polymerization is more likely to occur. Moreover, if the stirring material in the stirring equipment already has a certain degree of non-uniformity, the above phenomenon will be aggravated. Therefore, the present invention calculates the local polymerization tendency value based on the local temperature difference, the raw material sinking and floating area and the material characteristic difference obtained by the stirring material sample detection, characterizes the tendency of local polymerization after the stage raw materials are added at the stirring stage point, provides data support for the subsequent acquisition of potential polymerization anomaly judgment results, facilitates the subsequent adaptive adjustment of process parameters, and thus reduces the phenomenon of local polymerization in the stirring process and improves the uniformity of the prepared geopolymer material.

[0086] Specifically, the process of calculating the local aggregation propensity value includes:

[0087] determining a ratio of the local temperature difference to a reference local temperature difference as a first aggregation factor;

[0088] Determine the ratio of the base raw material sinking and floating area to the raw material sinking and floating area as a second polymerization factor;

[0089] A weighted sum of the first aggregation factor, the second aggregation factor, and the material characteristic difference characterization parameter is determined as a local aggregation tendency value.

[0090] Specifically, the purpose of setting the benchmark local temperature difference is to characterize the situation where the temperature difference is large. The results of several historical verifications at the stirring stage can be obtained in advance, the average local temperature difference of each verification can be determined, and the product of the local temperature difference average and the amplification factor can be determined as the benchmark local temperature difference, and the amplification factor is 1.25.

[0091] Specifically, the purpose of setting the benchmark raw material sinking and floating area is to characterize the situation where the sinking and floating area is small. The results of several historical verifications at the stirring stage can be obtained in advance, and the average sinking and floating area of ​​the raw materials verified in each time can be determined. The product of the average sinking and floating area of ​​the raw material and the reduction coefficient is determined as the benchmark raw material sinking and floating area, and the reduction coefficient is 0.85.

[0092] Specifically, the sum of the weight coefficients of the first aggregation factor, the second aggregation factor and the material characteristic difference characterization parameter is 1, the weight coefficient of the first aggregation factor is 0.33, the weight coefficient of the second aggregation factor is 0.32, and the weight coefficient of the material characteristic difference characterization parameter is 0.35.

[0093] See also Figure 2 , Figure 2 This is a logic block diagram of the present invention for obtaining the potential polymerization anomaly determination result of the stirring point in the stage. Specifically, the potential polymerization anomaly determination result of the stirring point in the stage is obtained, wherein:

[0094] If the local polymerization tendency value is greater than the local polymerization tendency value threshold, it is determined that there is a potential polymerization anomaly at the stirring point in the stage;

[0095] If the local polymerization tendency value is less than or equal to the local polymerization tendency value threshold, it is determined that there is no potential polymerization anomaly at the stirring point in the stage.

[0096] Specifically, the local aggregation tendency value threshold is calculated in advance, with the purpose of determining the boundary of potential aggregation anomalies in the stage mixing point. By pre-acquiring the local aggregation tendency values ​​of several historical mixing processes, the average value of each local aggregation tendency value is determined as the local aggregation tendency baseline value, and the product of the local aggregation tendency baseline value and the anomaly coefficient is determined as the local aggregation tendency value threshold. In order to characterize a stronger local aggregation tendency, the anomaly coefficient is determined to be selected within the interval [1.2,1.5]. Preferably, in implementation, the anomaly coefficient is 1.3.

[0097] Specifically, the addition rate of the raw materials in the stage is determined based on the local polymerization tendency value, wherein,

[0098] The addition rate of the raw materials in the stage is negatively correlated with the local polymerization tendency value.

[0099] Specifically, in implementation,

[0100] If the local aggregation tendency value is greater than the local aggregation tendency value threshold and less than 1.2 times the local aggregation tendency value threshold, the joining speed is 0.8 times the initial joining speed;

[0101] If the local aggregation tendency value is greater than or equal to 1.2 times the local aggregation tendency value threshold and less than or equal to 1.4 times the local aggregation tendency value threshold, the addition rate is 0.6 times the initial addition rate;

[0102] If the local aggregation tendency value is greater than 1.4 times the local aggregation tendency value threshold, the addition speed is 0.5 times the initial addition speed.

[0103] Specifically, the addition rate is the weight added to the stirring device per unit time. In practice, the raw materials can be added through any feeding equipment in the prior art. It is only necessary to adjust the feeding rate. Those skilled in the art can make a choice according to the application environment.

[0104] Specifically, the stirring speed is positively correlated with the local polymerization tendency value.

[0105] Specifically, in implementation,

[0106] If the local aggregation tendency value is greater than the local aggregation tendency value threshold and less than 1.2 times the local aggregation tendency value threshold, the stirring speed is 1.25 times the initial stirring speed;

[0107] If the local polymerization tendency value is greater than or equal to 1.2 times the local polymerization tendency value threshold and less than or equal to 1.4 times the local polymerization tendency value threshold, the stirring speed is 1.5 times the initial stirring speed;

[0108] If the local polymerization tendency value is greater than 1.4 times the local polymerization tendency value threshold, the stirring speed is 1.75 times the initial stirring speed.

[0109] Specifically, the present invention adaptively adjusts the stirring speed and the addition speed of the stage raw materials, and timely intervenes in the process parameters when there is a potential polymerization anomaly. The addition speed and stirring speed are adaptively adjusted based on the local polymerization tendency value to reduce the local polymerization phenomenon in the stirring process. Moreover, since local polymerization is most likely to occur when the stage raw materials are just added to the stirring equipment, at this stage, ultrasonic detection equipment is used to timely detect whether there is a local polymerization anomaly, and the adjusted process parameters are used to reduce the local polymerization phenomenon in the stirring process. Moreover, when the stirring is relatively stable, the initial stirring speed is restored, thereby saving energy and avoiding continuous rapid stirring.

[0110] See also Figure 3 , Figure 3 This is a logic block diagram of the present invention for determining whether there is a local aggregation anomaly. Specifically, the process of determining whether there is a local aggregation anomaly includes:

[0111] Determine the variance of the ultrasonic signal corresponding to each detection point as the local abnormal characteristic value;

[0112] If the local abnormal characteristic value is greater than the reference local abnormal characteristic value, continue stirring;

[0113] If the local abnormal characteristic value is less than or equal to the reference local abnormal characteristic value, the initial stirring speed is restored.

[0114] Specifically, the benchmark local anomaly characteristic value is pre-calculated. Those skilled in the art record in advance the historical local anomaly characteristic values ​​detected during the preparation of geopolymer materials without quality problems, and the average of the historical local anomaly characteristic values ​​is determined as the benchmark local anomaly characteristic value.

[0115] Specifically, the geopolymer material prepared by the method for preparing a geopolymer material for mine tunnel sealing of the present invention includes: pyrite slag, fly ash, cement, calcium-based bentonite, kaolin and lime composite alkaline activator.

[0116] In particular, in the implementation, the solid system of the polymer material comprises 73% by mass of pyrite waste, 10% of fly ash, 10% of cement, 1% of kaolin, and 6% of lime composite alkaline activator. In the total system, the water-solid ratio is 0.28.

[0117] Specifically, the polymer material is obtained by stirring pyrite waste, fly ash, cement, calcium-based bentonite, kaolin, lime, and a composite alkaline activator;

[0118] By determining the potential polymerization anomaly of the raw materials added at the mixing stage, we can determine the different addition rates for the raw materials at different stages and adjust the stirring speed. For example, bentonite and kaolin are clay minerals with strong hydrophilicity and water absorption and swelling properties. When they are added to the stirred sample, if the stirring is insufficient or not timely, water will be quickly absorbed by the surface of these clay particles, forming clumps that are difficult to disperse. These clumps are dry inside and wrapped in a water film on the outside. Subsequent stirring is difficult to completely break them up, seriously affecting the uniformity and performance of the final mixture. Therefore, by determining the potential polymerization anomaly, we can determine the addition rate of the raw materials at different stages and adjust the stirring speed, which can improve the compressive strength of geopolymer materials and reduce the preparation cost of polymer materials.

[0119] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0120] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for preparing a geopolymer material for mine tunnel sealing, characterized in that: include: Step S1, placing the initial stirring raw materials into a stirring device for stirring, and determining several stirring stage points; Step S2, obtaining samples of the stirred material at the stirring stage, and detecting differences in material characteristics of the stirred material samples; Step S3, determining the stage raw materials required to be added at the stirring stage point, and verifying the polymerization properties of the stage raw materials in the stirred sample. The verification process includes placing the stirred sample in an observation box, adding the stage raw materials to the surface of the stirred sample at different points, shaking the observation box, and obtaining the local temperature difference and the area of ​​the raw materials sinking and floating corresponding to each point; Step S4, calculating the local polymerization tendency value based on the local temperature difference, the sinking and floating area of ​​the raw material, and the material characteristic difference, and obtaining the potential polymerization abnormality determination result of the stage stirring point; Step S5, controlling process parameters based on the polymerization abnormality determination result, including determining the addition rate of the stage raw materials based on the local polymerization tendency value, adjusting the stirring speed, and adding the stage raw materials into the stirring device at the corresponding addition rate; Step S6: Placing the ultrasonic detection equipment on a lifting frame to perform cyclic detection on several detection points in the longitudinal direction of the stirring device. Based on the differences in the ultrasonic signals at each detection point during the cyclic detection process, it is determined whether there is a local polymerization abnormality, and the initial stirring speed is restored; Step S7, repeating steps S2 to S6 until all the raw materials in all stages are added to the stirring equipment, stirring is completed, and the target geopolymer material is obtained.

2. The method for preparing a geopolymer material for mine cave sealing according to claim 1, characterized in that: The process of detecting the material characteristic difference of the stirred sample includes: The hardness tester continuously presses different parts of the stirred sample to obtain several material hardness characterization values; Determine the variance of the hardness characterization values ​​of each of the materials as the material hardness difference value; The transmittance meter continuously measures different parts of the stirred sample to obtain the transmittance of several materials; Determining the variance of the light transmittance of each of the materials as the material homogeneity difference value; A weighted sum of the material hardness difference value and the material homogeneity difference value is determined as a material characteristic difference characterization parameter.

3. The method for preparing a geopolymer material for mine tunnel sealing according to claim 1, characterized in that: The process of obtaining the local temperature difference corresponding to each point includes: Determine the point temperature after oscillation at different points, and determine the temperature difference between the temperature at each point and the temperature of the stirred sample; The average value of each temperature difference is determined as the local temperature difference.

4. The method for preparing a geopolymer material for mine cave sealing according to claim 3, characterized in that: The process of obtaining the sinking and floating areas of raw materials corresponding to each point includes: Determine the raw material area corresponding to the different points mentioned before the shock; Determine the remaining raw material area corresponding to the different points after the shock; The reduction amount of the raw material area at each different point is calculated, and the average value of the reduction amount of the raw material area is determined as the raw material sinking and floating area.

5. The method for preparing a geopolymer material for mine cave sealing according to claim 2, characterized in that: The process of calculating the local aggregation tendency value includes: determining a ratio of the local temperature difference to a reference local temperature difference as a first aggregation factor; Determine the ratio of the base raw material sinking and floating area to the raw material sinking and floating area as a second polymerization factor; A weighted sum of the first aggregation factor, the second aggregation factor, and the material characteristic difference characterization parameter is determined as a local aggregation tendency value.

6. The method for preparing a geopolymer material for mine cave sealing according to claim 1, characterized in that: The potential polymerization anomaly determination result of the stirring point in the acquisition stage, wherein: If the local polymerization tendency value is greater than the local polymerization tendency value threshold, it is determined that there is a potential polymerization anomaly at the stirring point in the stage; If the local polymerization tendency value is less than or equal to the local polymerization tendency value threshold, it is determined that there is no potential polymerization anomaly at the stirring point in the stage.

7. The method for preparing a geopolymer material for mine cave sealing according to claim 1, characterized in that: The addition rate of the raw materials in the stage is determined based on the local polymerization tendency value, wherein, The addition rate of the raw materials in the stage is negatively correlated with the local polymerization tendency value.

8. The method for preparing geopolymer material for mine cave sealing according to claim 1, characterized in that: The stirring speed is positively correlated with the local polymerization tendency value.

9. The method for preparing a geopolymer material for mine cave sealing according to claim 1, characterized in that: The process of determining whether there is a local aggregation anomaly includes: Determine the variance of the ultrasonic signal corresponding to each detection point as the local abnormal characteristic value; If the local abnormal characteristic value is greater than the reference local abnormal characteristic value, continue stirring; If the local abnormal characteristic value is less than or equal to the reference local abnormal characteristic value, the initial stirring speed is restored.

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