CN113149590B - Filling material for filling mine, preparation method thereof and method for filling mine - Google Patents

Filling material for filling mine, preparation method thereof and method for filling mine Download PDF

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Publication number
CN113149590B
CN113149590B CN202110466567.8A CN202110466567A CN113149590B CN 113149590 B CN113149590 B CN 113149590B CN 202110466567 A CN202110466567 A CN 202110466567A CN 113149590 B CN113149590 B CN 113149590B
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filling
filling material
mine
cement
flame retardant
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CN113149590A (en
Inventor
张峰
武全伟
曲金星
尚宪猛
孟庆宝
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Huadian Ningxia Lingwu Power Generation Co ltd
Huadian Electric Power Research Institute Co Ltd
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Huadian Ningxia Lingwu Power Generation Co ltd
Huadian Electric Power Research Institute Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
    • C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F15/00—Methods or devices for placing filling-up materials in underground workings
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Civil Engineering (AREA)
  • Sealing Material Composition (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention provides a filling material for filling a mine, a preparation method thereof and a method for filling the mine. The invention provides a filling material for filling a mine, which is formed by the following raw materials in percentage by mass: 30-40% of an environment repairing material; 50-60% of polyurethane foam raw material; 4 to 8 percent of inorganic flame retardant; 0.6 to 2 percent of foam stabilizer. According to the invention, a specific environment repairing material, a polyurethane foam raw material, an inorganic flame retardant and a foam stabilizer are combined to form a filling material, so that the compressive strength of the material can be improved, a good flame retardant effect is achieved, and the filling material has the advantages of being rapid in construction, low in cost and the like; in addition, the fly ash is used in a large amount in the raw materials, compared with the direct adoption of concrete, the utilization rate of the formed building materials can be obviously reduced, the concrete belongs to a high-efficiency, low-carbon and environment-friendly product, and the recycling of waste resources is realized.

Description

Filling material for filling mine, preparation method thereof and method for filling mine
Technical Field
The invention relates to the field of mine filling, in particular to a filling material for filling a mine, a preparation method thereof and a method for filling the mine.
Background
A large number of goafs are left in underground mining mines in China, once the ground surface falls down, the safety of operators in pits can be endangered, the ecological environment is seriously damaged, and huge economic loss is caused. The existing method for treating the goaf generally comprises four categories of sealing, caving, reinforcing and filling. The residual gaps of the goaf comprise non-compacted holes in the goaf and cracks in a caving fracture zone, and the cracks are filled mainly through grouting to prevent the goaf site from sinking again. The grouting filling refers to a grouting construction process of manually injecting slurry materials with filling and cementing properties into a caving zone and a fissure zone of a goaf so as to increase the strength or reduce the permeability after hardening.
At present, the most applied grout material in China is mainly concrete, the concrete technology taking cement as a cementing material is gradually mature, but the transportation cost is continuously increased, so that the price of the concrete is increased year by year, and the construction operation cost for the pouring and backfilling of specific parts such as mine goafs and trenches is higher. However, different mining areas have different geological conditions and different requirements on material strength, freeze-thaw resistance, dry-wet resistance, acid and alkali resistance and the like, and many researchers have improved the performance of filling materials by researching alternative materials or adding different high polymer materials.
The high gas mine accounts for about 50 percent of the total number of coal mines in China, wherein the geological structure and the complicated mine thereof are as high as 2/3. With the extension of the mining depth and the increase of the difficulty, the underground operation is threatened by disasters such as dust, mine water, inflammable and explosive gas, a top plate and a bottom plate, and huge losses of personnel and economy are caused. According to incomplete statistics, the gas accidents account for about 20% of the total accidents of coal mines in China. At present, a sealing wall can be established between a roadway and a goaf for isolation, the traditional brick and concrete structures are generally adopted, the two structural technologies are mature, but the structure is influenced by the pressure of mine dynamic soil, the roadway top plate at the sealing wall still can continuously sink and deform, cracks with different degrees appear on the sealing wall, along with the increase of the pressure, the wall body cracks or even collapses, and the repaired wall body still has serious air leakage. In order to ensure the efficient and safe production of a mine, a flexible material with certain thickness and certain elasticity is added between a sealing wall and a roadway to replace part of masonry, so that the masonry deforms along with the deformation of the roadway, and the supporting pressure is mainly borne by a support and a coal pillar, so that the sealing wall is prevented from cracking and causing safety accidents. Among them, polyurethane foam is widely used as a coal mine sealing and plugging material.
The polyurethane material is a high-efficiency closed grouting material developed in the 70 s of the 20 th century. The polyurethane foam material is prepared by taking polyether or polyester polyol and binary or polybasic isocyanate as raw materials through a foaming reaction, can be quickly expanded to 15-25 times of the original volume, and can be hardened in a few minutes after the expansion is finished. The polyurethane foam material has the characteristic of controllable structural morphology, and can form polyurethane foam materials with different hardness according to different raw materials and different proportions. The performance of the material is relatively comprehensive, and the material has the advantages of good physical and mechanical properties, excellent weather resistance, elasticity, small change of soft and hard sections along with temperature and the like.
Polyurethane foam is divided into two categories, one category is rigid polyurethane foam, the structure of the rigid polyurethane foam is a closed cell structure, the sealing property is good, the water absorption rate is low, the toughness is small, and the rigid polyurethane foam is easy to crush when external force is applied; the other type is soft polyurethane foam, the structure of the soft polyurethane foam is an open-cell structure, the soft polyurethane foam has good toughness, the soft polyurethane foam can quickly recover to the original form after being compressed by external force, but the open-cell structure causes the characteristics of poor tightness and high water absorption rate. The polyurethane foam has the characteristics of low air permeability and easy adhesion with concrete, reinforced concrete bricks and other materials, and can complete the processes of forming, foaming, bonding and sealing in a short time. However, polyurethane foams are relatively expensive and are economically inefficient for use in mine filling. The polyurethane material is combustible in the air without flame retardant treatment, the Limit Oxygen Index (LOI) of the polyurethane material is only about 18 percent, and other additives can be added in the preparation process of the polyurethane material, so that the polyurethane is mostly incompletely combusted in the combustion process, and a large amount of CO, NO and NO can be released 2 Toxic gases such as HCHO, HCN and the like are easy to cause numerous casualties, and the safety problem of the sealing material is more and more important. At present, the safety problem of the sealing material is mainly solved by improving the flame retardant property in the polyurethane material, and the sealing material is divided into an additive flame retardant, a reactive flame retardant and a nano-composite flame retardant according to the existence form of the flame retardant. However, the introduction of the flame retardant easily affects the mechanical properties such as strength of the material.
Disclosure of Invention
The invention aims to provide a filling material for filling a mine, a preparation method thereof and a method for filling the mine. The filling material provided by the invention can improve the strength and the flame retardance of the material and can greatly reduce the material cost.
The invention provides a filling material for filling a mine, which is formed by the following raw materials in percentage by mass:
Figure BDA0003044277710000031
the environment restoration material is obtained by the following steps:
s1, mixing and granulating the master batch to form a master ball;
s2, mixing the mother ball with the secondary material to obtain a spherical environment repairing material;
wherein:
the master batch comprises the following components in percentage by mass:
Figure BDA0003044277710000032
the secondary material comprises the following components in percentage by mass:
Figure BDA0003044277710000033
preferably, the inorganic flame retardant comprises:
1 to 3 percent of magnesium hydroxide;
3 to 5 percent of aluminum hydroxide;
the polyurethane foam raw material comprises polyether polyol and isocyanate;
the mass ratio of the polyether polyol to the isocyanate is (17-25) to (5-7).
Preferably, in the master batch, the fineness of the fly ash is more than or equal to level 1;
in the secondary material, the fineness of the fly ash is more than or equal to level 1.
Preferably, the first and second liquid crystal materials are,
in the master batch:
the cement is cement with strength grade above P.O 42.5R;
the binder is sodium silicate and/or sodium sulfate;
in the secondary material:
the cement is cement with strength grade above P.O 42.5R.
Preferably, in the master batch, the additive comprises a pore-increasing agent and/or impervious fibers.
Preferably, the pore-increasing agent is selected from one or more of expanded perlite powder, aluminum powder, polystyrene and PMMA microspheres;
the impervious fiber is polypropylene reticular fiber.
Preferably, the mass ratio of the mother ball to the secondary material is 1: 0.8-1.5;
the particle size of the mother ball is 3-6 mm;
the particle size of the spherical environment repairing material is 8-15 mm.
Preferably, the foam stabilizer is polyacrylic acid and/or silicone amide.
The invention also provides a preparation method of the filling material in the technical scheme, which comprises the following steps:
and mixing the polyurethane foam raw materials, and then adding the inorganic flame retardant, the foam stabilizer and the environment repairing material for mixing to obtain the filling material.
The invention also provides a method for filling a mine, which comprises the following steps:
conveying the filling material into a mine, and filling the filling material on the surface of the roadway to form a roadway repair layer;
the filling material is the filling material in the technical scheme or the filling material prepared by the preparation method in the technical scheme.
The invention combines specific environment repairing material, polyurethane foam raw material, inorganic flame retardant and foam stabilizer to form the filling material, can improve the compressive strength of the material, and also has the advantages of rapid construction, low cost, good effect of stopping leakage, wind and flame, and the like, a large amount of fly ash is used in the raw material, compared with the direct adoption of concrete, the utilization rate of the formed building material is reduced by 40-65 percent, the invention belongs to a high-efficiency, low-carbon and environment-friendly product, simultaneously realizes the recycling of waste resources, and has great significance for the sustainable development of the society.
Experimental results show that the limiting oxygen index of the filling material provided by the invention is more than 19%, and the compressive strength is more than 3 MPa.
Detailed Description
The invention provides a filling material for filling a mine, which is formed by the following raw materials in percentage by mass:
Figure BDA0003044277710000051
the environment restoration material is obtained by the following steps:
s1, mixing and granulating the master batch to form a master ball;
s2, mixing the mother ball with the secondary material to obtain a spherical environment repairing material;
wherein:
the master batch comprises the following components in percentage by mass:
Figure BDA0003044277710000052
the secondary material comprises the following components in percentage by mass:
Figure BDA0003044277710000053
according to the invention, a specific environment repairing material, a polyurethane foam raw material, an inorganic flame retardant and a foam stabilizer are combined to form a filling material, so that the compressive strength of the material can be improved, a good flame retardant effect is achieved, and the filling material has the advantages of being rapid in construction, low in cost and the like; in addition, a large amount of fly ash is used in the raw materials, compared with the method of directly adopting concrete, the utilization rate of the formed building materials is reduced by 40% -65%, the method belongs to a high-efficiency, low-carbon and environment-friendly product, and meanwhile, the recycling of waste resources is realized.
According to the invention, the environmental remediation material is obtained by:
s1, mixing and granulating the master batch to form a master ball;
and S2, mixing the mother ball with the secondary material to obtain the spherical environment repairing material.
In the invention, the master batch comprises the following components in percentage by mass:
Figure BDA0003044277710000061
wherein;
the fineness of the fly ash is preferably more than or equal to grade 1. The source of the fly ash is not particularly limited, and the fly ash can be a general commercial product.
The cement is preferably cement with strength grade above P.O 42.5R. The source of the cement is not particularly limited, and the cement may be a commercially available product.
The source of the desulfurized gypsum is not particularly limited, and may be a commercially available product. The source of the quicklime is not particularly limited, and the quicklime can be obtained from a general commercial product.
The binder is preferably sodium silicate and/or sodium sulphate. In the present invention, the source of the binder is not particularly limited, and may be any commercially available product.
The admixture preferably comprises a pore-increasing agent and/or impervious fibres. Wherein, the pore-increasing agent is preferably one or more of expanded perlite powder, aluminum powder, polystyrene and PMMA microspheres. The barrier fibers are preferably polypropylene mesh fibers. The sources of the pore-increasing agent and the impervious fiber are not particularly limited, and the pore-increasing agent and the impervious fiber are common commercial products.
In the invention, the master batch components are fully mixed and then sent into a granulator, and an appropriate amount of water is optionally added for granulation to form the master batch. Wherein, the optional addition of water means that water can be added or not added, depending on the actual situation. The addition amount of the water is preferably 0-2% of the mass of the master batch. The water is preferably added by atomization. And (5) obtaining the spherical repairing material mother ball through the treatment of a granulator. In the present invention, the particle diameter of the obtained mother sphere is preferably 3 to 6mm.
In the invention, the secondary material comprises the following components in percentage by mass:
Figure BDA0003044277710000062
wherein:
the fineness of the fly ash is preferably more than or equal to grade 1. The source of the fly ash is not particularly limited, and the fly ash can be a general commercial product.
The cement is preferably cement with strength grade above P.O 42.5R. The source of the cement is not particularly limited, and the cement may be a commercially available product.
The source of the desulfurized gypsum is not particularly limited, and may be a commercially available product. The source of the quicklime is not particularly limited, and the quicklime is a general commercial product.
The ferrous sulfate is FeSO 4 ·7H 2 And O. The source of the ferrous sulfate is not particularly limited, and the ferrous sulfate is a general commercial product.
In the invention, after the mother ball is obtained, various components of the secondary material are added into a granulator to be continuously mixed, and a proper amount of water is optionally added in the process, so that the spherical environment repairing material taking the mother ball as a core and the secondary material as a coating layer is obtained. Wherein, the optional addition of water means that water can be added or not added, depending on the actual situation. The addition amount of the water is preferably 0-2% of the mass of the secondary material. The water is preferably added by spraying water into the mixing system. And (4) processing by a granulator to obtain the spherical environment repairing material.
In the invention, the mass ratio of the mother ball to the secondary material is preferably 1 to (0.8-1.5). In the present invention, the particle diameter of the spherical environmental remediation material is preferably 8 to 15mm.
According to the invention, the master batch with specific composition is firstly prepared to form the master ball, then the secondary material with specific composition is added, and a coating layer is formed on the basis of the master ball, so that the spherical environment restoration material is finally obtained. Specifically, the coal ash, cement and an additive are mixed to generate a porous environment repairing material with high pressure resistance, and ferrous sulfate is added to discretely distribute iron ions in gaps of the balls so as to provide nutrients required by mine soil repair; the addition of the hydroxide can enable the mixed material to have a flame retardant effect, steam generated by thermal decomposition at high temperature can absorb a large amount of heat, the concentration of oxygen and combustible products in a combustion area is diluted, the surface temperature of foam is reduced to be below the thermal decomposition temperature, stable metal oxide after thermal decomposition can be attached to the surface of a foam matrix to form a compact carbon layer with carbon residue, and generation of molten drops and smoke is inhibited; meanwhile, because the environment repairing material has the characteristic of high porosity, the added hydroxide can generate a silicon-oxygen tetrahedron and an aluminum-oxygen tetrahedron on the surface, the compression-resistant effect is enhanced, and the problem that the strength and mechanical properties of the material can be reduced due to the addition of the flame-retardant particles in the past is solved.
In accordance with the present invention, the filler material forming material also includes polyurethane foam material.
In the invention, the polyurethane foam raw materials comprise polyether polyol and isocyanate. The kind of the polyether polyol and the isocyanate is not particularly limited in the present invention, and may be any conventional raw material for forming polyurethane foam. In the present invention, the mass ratio of the polyether polyol to the isocyanate is preferably (17 to 25) to (5 to 7).
According to the present invention, the raw material forming the filler material further includes an inorganic flame retardant.
In the present invention, the inorganic flame retardant preferably includes: 1 to 3 percent of magnesium hydroxide and 3 to 5 percent of aluminum hydroxide. According to the invention, magnesium hydroxide and aluminum hydroxide are used as flame retardants, and steam generated by thermal decomposition of the flame retardants can absorb a large amount of heat, dilute the concentration of oxygen and combustible products in a combustion area, reduce the surface temperature of foam to be below the thermal decomposition temperature, and form a compact carbon layer with residual carbon by attaching stable metal oxide after thermal decomposition to the surface of a foam substrate, so that generation of molten drops and smoke is inhibited; meanwhile, the method is beneficial to the formation of alkali aluminosilicate in the fly ash and the improvement of the material strength. Therefore, the inorganic flame retardant, the polyurethane and the fly ash play a synergistic effect, the flame retardant effect is improved, the material strength is also improved, and the problem that the mechanical property of the material strength is reduced due to the addition of the flame retardant particles in the prior art is solved.
According to the present invention, the raw material for forming the filling material further includes a foam stabilizer.
In the present invention, the foam stabilizer is preferably polyacrylic acid and/or silicone amide. In the present invention, the source of the foam stabilizer is not particularly limited, and the foam stabilizer may be a commercially available product.
In the invention, the raw materials for forming the filling material comprise the following components in proportion:
Figure BDA0003044277710000081
in some embodiments of the invention, the amount of the environmental remediation material is 30%, 35% or 40%. In some embodiments of the invention, the polyurethane foam feedstock is present in an amount of 50%, 55%, or 60%. In some embodiments of the invention, the inorganic flame retardant is present in an amount of 4%, 6%, or 8%. In some embodiments of the invention, the amount of the foam stabilizer is 0.6%, 1.2% or 2%.
The invention also provides a preparation method of the filling material in the technical scheme, which comprises the following steps:
and mixing the polyurethane foam raw materials, and then adding the inorganic flame retardant, the foam stabilizer and the environment repairing material for mixing to obtain the filling material.
In the invention, the polyurethane foam raw materials are mixed, namely polyether polyol and isocyanate are mixed, the mixing temperature is not particularly limited, the mixing can be carried out at normal temperature, and the stirring and mixing can be carried out for 1-3 min. In the mixing process, polyether polyol reacts with isocyanate to form polyurethane foam. Then, preferably, sequentially adding an inorganic flame retardant, a foam stabilizer and an environment repairing material for mixing; the mixing temperature is not particularly limited, and the mixing can be carried out at normal temperature, and the mixing can be carried out for 20-30 min by stirring to obtain the filling material. The mixing process is changed as follows: the superfine fly ash generates a silica tetrahedron under the action of magnesium hydroxide, the silica tetrahedron is uniformly distributed in gaps of polyurethane foam to improve compressive strength, meanwhile, the magnesium hydroxide and aluminum hydroxide have a flame retardant effect, steam generated by thermal decomposition can absorb a large amount of heat, the concentration of oxygen and combustible products in a combustion area is diluted, the surface temperature of the foam is reduced to be below the thermal decomposition temperature, a stable metal oxide after thermal decomposition can be attached to the surface of a foam matrix, and a compact carbon layer is formed with residual carbon to inhibit the generation of molten drop substances and smoke, and the mixed material is high in foaming rate, high in expansion rate, high in tensile strength and good in tightness. The strength and the flame retardance of the whole material are improved through the combined action of the materials.
The invention also provides a method for filling a mine, which comprises the following steps: conveying the filling material into the mine, and filling the filling material on the surface of the roadway to form a roadway repair layer; the filling material is the filling material in the technical scheme or the filling material prepared by the preparation method in the technical scheme.
At present, main work of grouting, curing and filling of a mine is completed by transferring underground to the ground, namely, grouting filling materials are mixed in proportion through a ground grouting system, then mixed slurry is conveyed into underground closed by using a grouting pipe network, and one-time direct filling and reinforcing are completed. In the invention, the filling material is pumped to the mine and filled on the wall of the roadway/chamber to form a restoration body which is compounded on the surface of the roadway/chamber, thereby realizing the filling and repairing of the roadway/chamber of the mine.
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
Example 1
1.1 preparation of the starting Material
(1) An environment repairing material:
the formula of the master batch is as follows:
Figure BDA0003044277710000091
Figure BDA0003044277710000101
the secondary material formula comprises:
Figure BDA0003044277710000102
preparation: fully mixing the fly ash, the cement, the desulfurized gypsum, the quicklime, the binder and the pore-increasing agent, putting the mixture into a granulator, and adding water accounting for 2 percent of the total amount of the master batch in an atomizing manner to obtain the mother ball (with the particle size of 5 mm). And adding the secondary material components, spraying water accounting for 1% of the total amount of the secondary materials, and continuously mixing to obtain the spherical environment repairing material (with the particle size of 10 mm). Wherein the mass ratio of the mother ball to the secondary material is 1: 1.
(2) The raw material formula is as follows:
Figure BDA0003044277710000103
preparation: and (2) mixing and stirring polyether polyol and isocyanate at normal temperature (25 ℃) for 1min, then sequentially adding magnesium hydroxide, aluminum hydroxide, a foam stabilizer and an environment repairing material, and continuously stirring for 20min to obtain the filling material.
1.2 filling process:
the prepared filling material is pumped to an abandoned mine roadway (the length of the roadway is 72m, the width is 4m, and the height is 2.8 m) through a pipeline, and the filling material is directly filled to the surface of the roadway, and the spraying thickness is 15cm.
Example 2
1.1 preparation of the starting Material
(1) An environment repairing material:
the formula of the master batch is as follows:
Figure BDA0003044277710000111
the secondary material formula comprises:
Figure BDA0003044277710000112
preparation: the same as in example 1. Wherein the mass ratio of the mother ball to the secondary material is 1: 0.8.
(2) The raw material formula is as follows:
Figure BDA0003044277710000113
preparation: the same as in example 1.
1.2 filling process: the same as in example 1.
Example 3
1.1 preparation of starting materials
(1) An environment repairing material:
the formula of the master batch is as follows:
Figure BDA0003044277710000114
Figure BDA0003044277710000121
the secondary material formula comprises:
Figure BDA0003044277710000122
preparation: the same as in example 1. Wherein the mass ratio of the mother ball to the secondary material is 1: 1.5.
(2) The raw material formula is as follows:
Figure BDA0003044277710000123
preparation: the same as in example 1.
1.2 filling process: the same as in example 1.
Example 4
1.1 preparation of the starting Material
(1) An environment repairing material:
the formula of the master batch is as follows:
Figure BDA0003044277710000124
the secondary material formula comprises:
Figure BDA0003044277710000131
preparation: the same as in example 1. Wherein the mass ratio of the mother ball to the secondary material is 1: 1.
(2) The raw material formula is as follows:
Figure BDA0003044277710000132
preparation: the same as in example 1.
1.2 filling process: the same as in example 1.
Example 5
The filled materials of examples 1-4 were tested for properties and the results are shown in Table 1.
Among them, test of limiting oxygen index GB-T2406-1993; the test of the compressive strength is referred to GB/T8813-2008 and GB/T17671-1999.
Table 1 results of performance testing of examples 1 to 4
Limit oxygen index% Compressive strength, MPa
Example 1 21 3.18
Example 2 20 3.31
Example 3 21 4.03
Example 4 19 3.02
From the above test results, it can be seen that the filled material of the present invention has excellent compressive strength and flame retardancy.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. The filling material for filling the mine is characterized by being formed by raw materials comprising the following components in percentage by mass:
30% -40% of an environment repairing material;
50% -60% of polyurethane foam raw materials;
4% -8% of an inorganic flame retardant;
0.6% -2% of foam stabilizer;
the environment restoration material is obtained by the following steps:
s1, mixing and granulating the master batch to form a master ball;
s2, mixing the mother ball with the secondary material to obtain a spherical environment repairing material;
wherein:
the master batch comprises the following components in percentage by mass:
70% -87% of fly ash;
5% -10% of cement;
3% -5% of desulfurized gypsum;
3% -5% of quick lime;
1% -4% of a binder;
1% -4% of an additive;
wherein the additive is a pore-increasing agent and/or an impervious fiber;
the secondary material comprises the following components in percentage by mass:
67% -80% of fly ash;
10% -20% of cement;
3% -5% of desulfurized gypsum;
3% -5% of quick lime;
1% -3% of ferrous sulfate;
the inorganic flame retardant is:
1% -3% of magnesium hydroxide;
3% -5% of aluminum hydroxide;
the mass ratio of the mother ball to the secondary material is 1: 0.8 to 1.5;
the particle size of the mother ball is 3-6 mm;
the particle size of the spherical environment repairing material is 8-15mm;
the polyurethane foam raw material comprises polyether polyol and isocyanate;
the mass ratio of the polyether polyol to the isocyanate is 17-25: 5-7.
2. Filling material according to claim 1,
in the master batch:
the cement is cement with strength grade above P.O 42.5R;
the binder is sodium silicate;
in the secondary material:
the cement is cement with strength grade above P.O 42.5R.
3. The filling material of claim 1, wherein the pore-forming agent is aluminum powder;
the impervious fiber is polypropylene reticular fiber.
4. Filling material according to claim 1, wherein the foam stabilizer is polyacrylic acid and/or silicone amide.
5. A method for preparing the filling material according to any one of claims 1 to 4, comprising:
and mixing the polyurethane foam raw materials, and then adding the inorganic flame retardant, the foam stabilizer and the environment repairing material for mixing to obtain the filling material.
6. A method of filling a mine, comprising:
conveying the filling material into the mine, and filling the filling material on the surface of the roadway to form a roadway repair layer;
the filling material is the filling material of any one of claims 1 to 4 or the filling material prepared by the preparation method of claim 5.
CN202110466567.8A 2021-04-28 2021-04-28 Filling material for filling mine, preparation method thereof and method for filling mine Active CN113149590B (en)

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4744700A (en) * 1987-02-24 1988-05-17 Washington Penn Plastic Co. Method for filling abandoned mines
CN104743999A (en) * 2015-03-09 2015-07-01 沈阳化工大学 Dual-component mining foam paste filling material and preparation method thereof
CN106883369A (en) * 2017-03-17 2017-06-23 陕西德源府谷能源有限公司 Compound mine packing material of a kind of cement polyurethane and preparation method thereof
CN109734362B (en) * 2019-01-23 2022-02-25 四川共拓岩土科技股份有限公司 Inorganic compound polyurethane grouting material and preparation method thereof
CN112266209A (en) * 2020-10-15 2021-01-26 新化县东泰特种耐火材料有限公司 Filling material for energy-saving plate and preparation method thereof

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