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CN-121974621-A - Expansion delay type mining hole sealing material

CN121974621ACN 121974621 ACN121974621 ACN 121974621ACN-121974621-A

Abstract

The invention discloses an expansion delay type mining hole sealing material, which belongs to the technical field of mining hole sealing materials, and provides two formula schemes: according to the scheme I, modified slag micropowder and silicate cement are used as a matrix, flexible organic fibers and nano materials are used as reinforcements, and a bio-based foaming agent, delay activator coated particles and retarder are combined to form an expansion delay control system, so that natural surfactant, stabilizer and high-molecular polymer emulsion are used as auxiliary materials. The second scheme uses silicate cement as a matrix, and uses flexible organic fiber and nano material for reinforcement, and glass beads, expanded perlite functional filler and optional bio-based foaming agent are matched, so that the preparation process is simplified. According to the invention, the precise expansion control is realized through the cooperation of the delay excitant and the retarder, the full-scale crack filling is realized by means of the functional filling and foaming technology, the mechanical property and durability are improved by means of the composite design of the matrix and the reinforcement, and the high-value utilization of industrial solid waste is realized.

Inventors

  • ZHANG HENG
  • YANG JINGXUAN
  • WANG CHUANFENG
  • ZHAO ZHIYUAN
  • LIU CHENG
  • XU DONG
  • SUN KAIQIANG

Assignees

  • 淮北矿业股份有限公司

Dates

Publication Date
20260505
Application Date
20251227

Claims (10)

  1. 1. The expansion delay type mining hole sealing material is characterized by comprising the following components in percentage by mass: 30-50 parts of modified slag micropowder and 20-40 parts of ordinary silicate cement or composite silicate cement; 0.5-2.0 parts of flexible organic fiber and 1-3 parts of nano silicon dioxide or nano cellulose; The expansion delay control system comprises 0.3-1.0 part of bio-based foaming agent, 1-3 parts of delay activator coated particles and 0.1-0.3 part of retarder; 0.1-0.3 part of natural surfactant, 0.2-0.6 part of natural stabilizer and 3-8 parts of high polymer emulsion; solvent, water and water in a water-cement ratio of 0.4:1-1:1; the preparation method of the hole sealing material comprises the following steps: s1, preparing modified slag micro powder, namely ball-milling the slag micro powder until the D90 is less than or equal to 45 mu m, adding NaOH and Na 2 SO 4 to mix an exciting agent, maintaining in a water bath at a constant temperature of 80 ℃ for 24 hours, and drying; S2, preparing a dry mixture, namely weighing cement, modified slag micropowder, nano materials, delay excitant coated particles and retarder according to the proportion, and dry-mixing for 5 minutes to uniformity; S3, adding the mixing and foaming system, namely premixing water, polymer emulsion, a bio-based foaming agent, a surfactant and a stabilizer into foaming auxiliary liquid, slowly adding the foaming auxiliary liquid into a dry mixed material, stirring for 3 minutes at a low speed, and adding flexible fibers to stir for 2 minutes to form uniform slurry; s4, performing performance test on the hole sealing slurry prepared in the step S3.
  2. 2. The expansion delay type mining hole sealing material according to claim 1, wherein the hole sealing material comprises the following components in parts by weight: 30-50 parts of cement matrix, namely ordinary silicate cement or slag silicate cement; 1-3 parts of flexible organic fiber and 0.5-2 parts of nano silicon dioxide or nano cellulose; 2-5 parts of functional filler, 1-3 parts of micro-bead filler; 0.5-1.5 parts of optional foaming agent; The solvent is water, and the water-cement ratio is 0.4-0.5; The hole sealing material is prepared by uniformly mixing a cement matrix, flexible organic fibers, nano silicon dioxide or nano cellulose and a functional filler according to a proportion, adding water and a bio-based foaming agent, and stirring for 5 minutes to form uniform slurry.
  3. 3. The expansion delay type mining hole sealing material according to claim 1, wherein the modified slag micro powder is prepared by activating slag by an alkaline activator with mass fraction of 5% -8%, the alkaline activator is one or a mixture of two of sodium hydroxide and calcium hydroxide, and the total content of active ingredients of tricalcium silicate and dicalcium silicate in the modified slag micro powder is more than or equal to 85%.
  4. 4. The expansion delay type mining hole sealing material according to claim 2, wherein the bead filler is glass beads with the particle size of 50-100 μm and is used for providing a light framework and filling micropores, the light filler is expanded perlite with the particle size of 1-3 mm and is used for reducing the overall weight of the hole sealing material.
  5. 5. The expansion delay type mining hole sealing material according to claim 1 or 2, wherein the flexible organic fiber is one or more of basalt fiber, carbon fiber and polypropylene fiber, the length of the flexible organic fiber is 5-10 mm, and the diameter of the flexible organic fiber is 10-20 μm.
  6. 6. The expansion delay type mining hole sealing material according to claim 1 or 2, wherein the bio-based foaming agent is at least one of a starch-based foaming agent, a lignin-based foaming agent and a protein-based foaming agent, and the foaming ratio of the bio-based foaming agent is 1.5-2.5 times.
  7. 7. The expansion-delayed type mining hole sealing material according to claim 1, wherein the natural surfactant is one or more of a saponin extract and a coconut oil extract.
  8. 8. The expansion delay type mining hole sealing material according to claim 1, wherein the natural stabilizer is at least one of sodium alginate and chitosan.
  9. 9. The expansion delay type mining hole sealing material according to claim 1, wherein the delay activator wrapping particles are prepared by coating Na 2 SO 4 particles with SiO 2 and are used for inducing the generation of later-stage ettringite.
  10. 10. The expansion delay type mining hole sealing material according to claim 1, wherein the high polymer emulsion is EVA or SBR emulsion, and the retarder is tartaric acid or citric acid.

Description

Expansion delay type mining hole sealing material Technical Field The invention belongs to the technical field of mining hole sealing materials, and particularly relates to an expansion delay type mining hole sealing material. Background The traditional mining hole sealing material is poor in hole sealing effect and insufficient in durability due to early excessive expansion or mismatching of expansion time, and cannot meet the requirement of underground environment on long-term stable sealing. To solve this problem, various improvements have been proposed in the prior art. For example, the patent document CN114873966B, by adding a nano aluminum powder and submicron aluminum powder composite expanding agent and combining a retarder to regulate and control the expansion rate, improves the sealability and thixotropic property of the material for horizontal drilling, but the expansion rate is only 2% -5%, depends on aluminum powder with specific particle size, has limited adaptability to complex cracks, realizes expansion delay by coating the aluminum powder with microcapsules in the patent document CN104817305B, improves the expansion rate to 15% -25%, but the microcapsule preparation process is complex, the cost of the resin coating material is high, and the environmental protection of the material is possibly affected. Although the schemes improve hole sealing performance to different degrees, the problems of insufficient expansion rate, complex process, high cost, poor environmental adaptability and the like still exist, and the requirements of long-term stability and comprehensive performance of the hole sealing material under the underground complex geological conditions are difficult to fully meet. In summary, although the prior art has advanced to some extent in the aspects of expansion control, strength improvement or delayed expansion, the prior art still fails to solve the multiple problems of high expansion rate, effective filling of complex cracks, environmental protection and the like. In particular, in severe underground environments such as high temperature, high humidity, deep stress and the like, the existing hole sealing material is still easy to have defects such as expansion failure, incomplete sealing, insufficient durability and the like, and cannot meet the urgent requirements of engineering such as modern coal mine gas extraction and the like on the high performance, high reliability and environmental friendliness of the hole sealing material. Disclosure of Invention The invention aims to provide an expansion delay type mining hole sealing material, which aims to solve the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme that the expansion delay type mining hole sealing material comprises the following components in parts by mass: 30-50 parts of modified slag micropowder and 20-40 parts of ordinary silicate cement or composite silicate cement; 0.5-2.0 parts of flexible organic fiber and 1-3 parts of nano silicon dioxide or nano cellulose; The expansion delay control system comprises 0.3-1.0 part of bio-based foaming agent, 1-3 parts of delay activator coated particles and 0.1-0.3 part of retarder; 0.1-0.3 part of natural surfactant, 0.2-0.6 part of natural stabilizer and 3-8 parts of high polymer emulsion; solvent, water and water in a water-cement ratio of 0.4:1-1:1; the preparation method of the hole sealing material comprises the following steps: s1, preparing modified slag micro powder, namely ball-milling the slag micro powder until the D90 is less than or equal to 45 mu m, adding NaOH and Na 2SO4 to mix an exciting agent, maintaining in a water bath at a constant temperature of 80 ℃ for 24 hours, and drying; S2, preparing a dry mixture, namely weighing cement, modified slag micropowder, nano materials, delay excitant coated particles and retarder according to the proportion, and dry-mixing for 5 minutes to uniformity; S3, adding the mixing and foaming system, namely premixing water, polymer emulsion, a bio-based foaming agent, a surfactant and a stabilizer into foaming auxiliary liquid, slowly adding the foaming auxiliary liquid into a dry mixed material, stirring for 3 minutes at a low speed, and adding flexible fibers to stir for 2 minutes to form uniform slurry; s4, performing performance test on the hole sealing slurry prepared in the step S3. In a specific embodiment, the pore sealing material comprises or comprises the following components: 30-50 parts of cement matrix, namely ordinary silicate cement or slag silicate cement; 1-3 parts of flexible organic fiber and 0.5-2 parts of nano silicon dioxide or nano cellulose; 2-5 parts of functional filler, 1-3 parts of micro-bead filler; 0.5-1.5 parts of optional foaming agent; The solvent is water, and the water-cement ratio is 0.4-0.5; The hole sealing material is prepared by uniformly mixing a cement matrix, flexible organic fibers, nano silicon dioxi