CN112897963A - Industrial solid waste base inorganic paste filling material, preparation method and rapid filling method - Google Patents

Industrial solid waste base inorganic paste filling material, preparation method and rapid filling method Download PDF

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Publication number
CN112897963A
CN112897963A CN202110110292.4A CN202110110292A CN112897963A CN 112897963 A CN112897963 A CN 112897963A CN 202110110292 A CN202110110292 A CN 202110110292A CN 112897963 A CN112897963 A CN 112897963A
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China
Prior art keywords
solid waste
filling
industrial solid
inorganic paste
paste filling
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CN202110110292.4A
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Inventor
贾靖
卢志敏
秦大健
王学伟
郝永超
董小娟
王英
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Hebei Coal Science Research Institute Co ltd
Hebei Filling Mining Technology Co ltd
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Hebei Coal Science Research Institute Co ltd
Hebei Filling Mining Technology Co ltd
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Priority to CN202110110292.4A priority Critical patent/CN112897963A/en
Publication of CN112897963A publication Critical patent/CN112897963A/en
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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
    • C04B28/02—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 hydraulic cements other than calcium sulfates
    • C04B28/08—Slag cements
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
    • C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
    • C04B7/17—Mixtures thereof with other inorganic cementitious materials or other activators with calcium oxide containing activators
    • C04B7/19—Portland cements
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
    • C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • 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
    • 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
    • E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
    • 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
    • E21F15/08—Filling-up hydraulically or pneumatically
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention provides an industrial solid waste base inorganic paste filling material, a preparation method and a rapid filling method, and belongs to the technical field of mine filling. The invention provides an industrial solid waste base inorganic paste filling material which is prepared by mixing coarse aggregate, fine aggregate and solid waste filling cementing material. The rapid filling method is that the industrial solid waste base inorganic paste filling material is taken and transported to the underground through a ground feeding hole, and then is uniformly mixed with mine water, and the obtained paste filling slurry is used for filling the goaf. The industrial solid waste base inorganic paste filling material provided by the invention does not need underground weighing, can be directly used by adding water, and compared with the existing paste filling process, the industrial solid waste base inorganic paste filling material reduces the difficulty of underground classified conveying of various solid materials, simultaneously reduces the space occupancy rate of underground equipment and a weighing system, reduces the underground working strength, and improves the safety factor and the working efficiency.

Description

Industrial solid waste base inorganic paste filling material, preparation method and rapid filling method
Technical Field
The invention belongs to the technical field of mine filling, and particularly relates to an industrial solid waste base inorganic paste filling material, a preparation method and a rapid filling method.
Background
With the continuous decrease of underground high-quality resources, the exploitation of the 'three' resources gradually becomes an important means for extending the service life of mines of various large mine enterprises. The development and innovation of the filling coal mining technology also gradually become an important technical means for promoting the development of the mining industry and protecting the ecological environment. Therefore, the development and application of filling technology gradually become a key technology of great tendency in the mining industry. The paste filling mining technology is gradually widely accepted and applied after years of development, and simultaneously, a plurality of technical difficulties and technical bottlenecks are exposed, and the technical difficulties and the technical bottlenecks become important restriction factors for the development of the filling technology. The traditional mine paste filling technology is a technological process that coal gangue, construction waste, fly ash, cement, a small amount of additives and the like are processed and mixed with water according to a certain proportion, filling slurry is prepared on the ground, and the filling slurry is conveyed to an underground goaf through a ground grouting system, a conveying pipeline and the like. However, the particle size of coarse aggregates such as coal gangue and construction waste in the filling material is larger, the technical requirements such as particle composition, fluidity, slump, setting time and the like with fine aggregates such as fly ash are strict, and the cost of cement and additive materials is high, so that the technical difficulty of filling paste is greatly increased.
Disclosure of Invention
The invention aims to provide an industrial solid waste base inorganic paste filling material, and aims to solve the problems of high filling cost and high filling difficulty in filling of an underground goaf in the prior art;
the invention also aims to provide a preparation method of the industrial solid waste base inorganic paste filling material;
the last purpose of the invention is to provide a rapid filling method of the industrial solid waste inorganic paste filling material.
In order to achieve the purpose, the invention adopts the technical scheme that: the industrial solid waste base inorganic paste filling material is provided, and the raw materials for preparing the effective components of the industrial solid waste base inorganic paste filling material comprise the following components in parts by weight: 50-65 parts of coarse aggregate, 15-25 parts of fine aggregate and 3-8 parts of solid waste filling cementing material.
As another embodiment of the application, the solid waste filling cementing material is prepared by crushing 15-20 parts of modified industrial byproduct gypsum, 12-16 parts of portland cement clinker and 0.15-0.5 part of additive, adding 64-73 parts of granulated blast furnace slag powder, and uniformly stirring.
As another embodiment of the application, the modified industrial byproduct gypsum is prepared by airing gypsum (desulfurized gypsum, phosphogypsum or fluorgypsum) with the moisture content of more than or equal to 12 wt% until the moisture content is less than or equal to 8 wt%, then carrying out coarse grinding, heating and drying by utilizing circulating hot air until the moisture content is less than 3 wt%, then continuously calcining for more than 1h at 180-200 ℃, and then grinding;
the fineness of the modified industrial byproduct gypsum is 80 mu m, the negative pressure sieve residue is less than 2 percent, and the modified industrial byproduct gypsum is gypsum powder which is mainly composed of beta-type semi-hydrated gypsum;
the crystal of the modified industrial byproduct gypsum is complete in development and compact in growth, and has excellent performances in the aspects of setting time, standard consistency, strength and the like;
the additive is prepared by mixing 1-3 parts of polycarboxylic acid, 0.5-1 part of sodium silicate and 0.5-1 part of melamine.
As another embodiment of the application, the specific surface area of the solid waste filling cementing material is more than or equal to 40m2The screen residue of a negative pressure screen with the particle size of 80 mu m is less than 1 percent per kg.
As another embodiment of the present application, the coarse aggregate is at least one of gangue, slag and construction waste;
the coarse aggregate is prepared by taking at least one of granular coal gangue, slag and construction waste, coarsely crushing by a jaw crusher and finely crushing by a sand making machine;
the maximum grain size of the coarse aggregate is less than 8mm, and the average grain size is less than 5 mm;
the water content of the coal gangue, the slag or the construction waste is below 10 wt%, and the maximum granularity is less than 400 mm.
As another embodiment of the present application, the fine aggregate is fly ash and/or loess;
the fine aggregate is prepared by taking fly ash and/or loess, airing/drying until the water content is less than or equal to 6%, and then screening;
the fly ash is produced by a gangue power plant/a thermal power plant, and the activity of the fly ash is not required;
the fineness of the fine aggregate is 80 mu m, and the residue of the negative pressure sieve is less than 15%.
The invention also provides a preparation method of the industrial solid waste base inorganic paste filling material, which is prepared by mixing all the raw materials.
The invention also provides a method for rapidly filling the industrial solid waste base inorganic paste filling material, which is characterized in that the industrial solid waste base inorganic paste filling material is taken and conveyed to the underground through a ground feeding hole, and is uniformly mixed with mine water, and then the obtained paste filling slurry is used for filling a goaf;
the weight ratio of coarse aggregate, fine aggregate, solid waste filling cementing material and mine water in the industrial solid waste base inorganic paste filling material is 50-65: 15-25: 3-8: 20 to 32.
As another embodiment of the present application, the step of filling the goaf includes disposing a sealing wall at an opening of the goaf to enclose the goaf into a sealed space, and disposing a reserved grouting hole on the sealing wall for a pipeline to pass through.
As another embodiment of the present application, the sealing wall includes a metal mesh covering the entire cross-section of the gob, a single support for supporting the metal mesh, and a covering barrier layer covering the metal mesh.
The industrial solid waste base inorganic paste filling material provided by the invention has the beneficial effects that: compared with the prior art, the method has the advantages that,
on the premise of ensuring the strength of the filling material, the dosage of the solid waste filling cementing material is reduced by 10-20%, so that the cost of the filling material is effectively reduced; the industrial solid waste base inorganic paste filling material has low technical requirements on concentration, bleeding rate, slump and the like, greatly reduces the technical difficulty of paste filling, improves the filling efficiency and enlarges the application range of paste filling; the materials used in the mixing method have wide sources, low cost and simple production process;
furthermore, the solid waste filling cementing material is an industrial solid waste base new material developed aiming at the special requirements of paste filling, has low material cost and simple production process, and can completely replace cement;
after the industrial byproduct gypsum adopted by the invention is calcined at high temperature, the crystal is completely developed and grows compactly, and the gypsum has excellent performances in the aspects of setting time, standard consistency, strength and the like;
in the additive, the polycarboxylic acid is used as a high-efficiency water reducing agent, so that the water consumption can be reduced in the paste pulping process, the workability and the fluidity of paste materials are improved, and after filling slurry is injected into a goaf, the phenomenon of layered segregation of thick and thin materials is greatly reduced, the hydration reaction speed of a filling body is accelerated, and the reaction time is shortened; the sodium silicate is used as a coagulation promoting material for filling the paste, so that the hydration activity of the cementing material can be fully excited, the hydration speed is accelerated, the hydration degree is improved, and the formation of hydration products such as dicalcium silicate, tricalcium silicate and the like is promoted, so that the solidification time is shortened, and the early strength and the final strength of the filling body are improved; the melamine is used as an activating agent, so that the fluidity of filling slurry can be effectively improved, and the activity of inert materials such as gangue and the like and materials such as fly ash and the like is improved, so that the strength of a filling body is improved;
the industrial solid waste base inorganic paste filling material disclosed by the invention does not need underground weighing, can be directly used by adding water, and compared with the existing paste filling process, the industrial solid waste base inorganic paste filling material has the advantages that the difficulty of underground classified conveying of various solid materials is reduced, the space occupancy rates of underground equipment and a weighing system are reduced, the underground working strength is reduced, and the safety coefficient and the working efficiency are improved;
according to the invention, the industrial solid waste base inorganic paste filling material is put in through the ground feeding hole, so that pipe blockage or material segregation and other conditions caused by the influence of factors such as set pressure or ratio, fluidity, slump, setting time and the like in the paste filling slurry pipeline conveying process are avoided, various technical index requirements on material performance in the paste filling pulping process are reduced, the pipeline abrasion replacement and maintenance cost is reduced, and the pulping difficulty and the conveying technical difficulty are greatly reduced; meanwhile, the invention does not occupy the resources of the mine auxiliary transportation system, reduces the pressure of the solid materials on the ground and the underground transportation system, and improves the working efficiency.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a preparation process and a rapid filling process of an industrial solid waste inorganic paste filling material according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for preparing an industrial solid waste inorganic paste filling material according to an embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view of a feeding hole according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for rapidly filling an industrial solid waste inorganic paste filling material according to an embodiment of the present invention;
figure 5 is a plan view of the arrangement of gob filling employed in an embodiment of the present invention.
In the figure: 1. a bucket elevator; 2. a bin top spiral distributor; 3. a fine aggregate bin; 4. a spiral scale; 5. filling a cementing material bin with solid wastes; 6. a coarse aggregate finished product bin; 7. a belt conveyor; 8. a belt scale; 9. a mixer; 10. a coarse aggregate crushing plant; 11. a ground feeding hole; 111. wear-resistant composite steel pipes; 112. a cement reinforcing layer; 12. a solid material storage bin; 13. a water delivery pipeline; 14. a horizontal double-shaft mortar mixer; 15. a high pressure pump; 16. a delivery line; 17. a rapid fill system; 18. a flexible connection pipe; 19. a containment wall; 191. a single support; 192. a metal mesh; 193. covering the barrier layer; 20. reserving a grouting pipe; 21. a gob; 22. and filling the paste.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1 preparation method and rapid filling method of industrial solid waste base inorganic paste filling material
A preparation method and a rapid filling method of an industrial solid waste base inorganic paste filling material are disclosed, wherein a part of process flow chart is shown in figure 1, and the method comprises the following specific steps:
preparation method of industrial solid waste base inorganic paste filling material
1) Preparation of solid waste filling cementing material
11) Taking desulfurized gypsum with the moisture content of 12 wt%, airing until the moisture content is 8 wt%, conveying the desulfurized gypsum into a mill by using a belt conveyor, carrying out coarse grinding processing, heating and drying by using circulating hot air until the moisture content is 2.8 wt%, continuously calcining for 1h at 180 ℃, and finally grinding the desulfurized gypsum by using a mill to prepare modified industrial byproduct gypsum, wherein the 80 mu m negative pressure sieve residue of the modified industrial byproduct gypsum is less than 2%;
0.15kg of polycarboxylic acid (high efficiency water reducing agent, powder), 0.075kg of sodium silicate (powder) and 0.075kg of melamine (powder) are uniformly mixed by a mixer to prepare the additive, wherein the proportion of the polycarboxylic acid, the sodium silicate and the melamine is 2: 1: 1.
12) 15kg of modified industrial by-product gypsum, 15kg of portland cement clinker and 0.3kg of additive are taken to be processed and crushed together by a ball mill, and 70kg of granulated blast furnace slag powder (the specific surface area is more than or equal to 420 m) is added2/kg) to prepare the solid waste filling cementing material with the specific surface area more than or equal to 400m2The screen residue of a negative pressure screen with the particle size of 80 mu m is less than 1 percent per kg. The obtained solid waste filling cementing material is stored in a solid waste filling cementing material bin 5 for standby
2) Preparation of industrial solid waste base inorganic paste filling material
21) In a coarse aggregate crushing workshop 10, taking coal gangue with the moisture content of less than or equal to 10 wt% and the maximum particle size of less than 400, coarsely crushing the coal gangue by using a jaw crusher, and finely crushing the coal gangue by using a sand making machine to prepare coarse aggregate, wherein the maximum particle size of the coarse aggregate is less than 8mm, the average particle size of the coarse aggregate is less than 5mm, and the content of particles with the particle size of 1.00-4.75 mm in the gradation is 50-70%; the obtained coarse aggregate is stored in a coarse aggregate finished product bin 6 for later use.
The fly ash is dried in the sun until the water content is less than or equal to 6 percent, and then screened by a screening machine to prepare fine aggregate, the fineness of which is 80 mu m, and the residue of a negative pressure screen is less than 15 percent. The obtained fine aggregate is lifted to a bin top spiral distributing machine 2 through a bucket elevator 1, and is put into a fine aggregate bin 3 for standby through the bin top spiral distributing machine 2.
22) 52.5kg of coarse aggregate is weighed by a belt scale 8, 15kg of fine aggregate and 7.5kg of solid waste filling cementing material are weighed by a spiral scale 4, and are conveyed to a mixer 9 by a belt conveyor 7 to be mixed to prepare the industrial solid waste based inorganic paste filling material, which is marked as M1.
II) quick filling method of industrial solid waste base inorganic paste filling material
The ground feeding holes 11 vertical to the ground are arranged in a ground drilling mode, the aperture is 200mm (generally 180-230 mm), KN and 60 wear-resistant composite steel pipes 111 with the thickness of 30mm (generally 25-35 mm) are installed outside the pipe walls after hole forming, finally P.O 42.5.5 portland cement is used for filling and reinforcing behind the walls to form cement reinforcing layers 112, the ground feeding holes 11 are manufactured, the sectional view is shown in figure 3, the construction process of the ground feeding holes 11 is simple, the technical requirement is low, the pipeline wear is small, the investment is low, under special conditions, other solid materials can be conveyed through the ground feeding holes 11, one-space-multiple purposes are achieved, and various mine requirements are fully met.
The step of filling the goaf 21 comprises the steps of arranging a sealing wall 19 at the mouth of the goaf 21 to enclose the goaf 21 into a closed space, and arranging a reserved grouting hole for a pipeline to pass through on the sealing wall 19. As shown in FIG. 5, the sealing wall 19 includes a metal mesh 192 covering the whole cross section of the gob 21, a single support 191 for supporting the metal mesh, and a covering barrier 193 (typically, a carbon steel metal mesh with a pore size of 50 × 50 to 100 × 100mm and a wire diameter of 3 to 5mm, and a plastic woven cloth with a tensile load of 600N/50mm or more) covering the metal mesh 192. The joint of the closed wall 19 and the rock wall or the coal wall is reinforced and closed by a sand bag or a coal cinder bag. The reserved grouting holes are formed by reserving or drilling holes in the upper portion of the goaf 21 close to the top plate to lay filling pipelines, and the distance between the tail ends of the filling pipelines and the sealing wall is 20-30 m. The filling airtight wall has the advantages of simple structure process, high speed, low cost and low requirements on construction materials such as metal meshes and plastic woven cloth, and can meet the airtight requirements of the underground rapid filling gob 21.
As shown in fig. 1, an industrial solid waste base inorganic paste filling material is conveyed to an underground solid material storage bin 12 through a ground feeding hole 11, 25kg of mine water is conveyed to a horizontal double-shaft mortar mixer 14 through a water conveying pipeline 13 and is uniformly mixed, the obtained paste filling slurry is conveyed to a rapid filling system 17 through a high-pressure pump 15 and a conveying pipeline 16, and finally, a flexible connecting pipe 18 is used for injecting the slurry through a reserved pipeline through a reserved grouting hole to fill a goaf 21, so that a paste filling body 22 is obtained.
Wherein the weight ratio of the coarse aggregate, the fine aggregate, the solid waste filling cementing material and the mine water in the industrial solid waste base inorganic paste filling material is 52.5: 15: 7.5: 25;
the high-pressure pump is an explosion-proof concrete delivery pump for the mine, the pumping pressure is 25Mpa, the horizontal delivery distance is 320-500 m, and the maximum flow is 28m3H; the conveying pipeline is a wear-resistant steel pipe with the pipe diameter of 80-100 mm;
the rapid filling system mainly comprises 2 quick filling systems and 5 quick filling systems3The storage stirring module and the high-pressure pumping system module form, an underground explosion-proof rubber-tyred vehicle is carried on, the pumping pressure of the high-pressure pumping system module is 20Mpa, the horizontal conveying distance is 280-320 m, and the maximum flow is 17m3/h；
The rapid filling system has the characteristics of modularization and integration, and mainly comprises 1-4 material storage stirring modules, 1 high-pressure pumping system module, a connecting pipeline, other auxiliary equipment modules and the like, wherein the modules can be combined and integrated as required, a rubber-tyred vehicle can be used for manufacturing the mobile rapid filling system, or a semi-fixed rapid filling system is arranged in a roadway near a goaf, and the process flow is shown in a figure 4. Compared with the existing filling process, the rapid filling system can freely combine the modules according to the requirements to manufacture a movable or semi-fixed filling system, is arranged nearby a region to be filled, can be matched with an underground pulping pumping system for use, and can also be used independently; the combination of modularization and integration enables the rapid filling system to have wider use space, and provides safer, more efficient and faster technical methods for underground rapid filling, fixed-point quantitative filling and underground emergency treatment.
The invention builds the pulping station underground, has simple equipment, small occupied area and less investment, can determine the pulp amount according to the requirement, can meet the requirements of quick and small-scale underground filling and grouting, can install a secondary pressurizing and pumping system at a proper position according to the requirement when the grouting pressure is insufficient, can completely meet the requirement of underground long-distance conveying, simultaneously shortens the interval conveying distance by a modularized conveying process, reduces the performance requirement on the preparation of filling pulp, and is convenient for equipment maintenance and repair.
Example 2 preparation method of industrial solid waste base inorganic paste filling material
Preparation method of industrial solid waste base inorganic paste filling material
1) Preparation of solid waste filling cementing material
11) Taking fluorgypsum with the moisture content of 12.8 wt%, airing until the moisture content is 7.5 wt%, conveying the fluorgypsum into a mill by using a belt conveyor, carrying out coarse grinding processing, heating and drying by using circulating hot air until the moisture content is 2.7 wt%, continuously calcining for 1.1h at 200 ℃, and finally grinding by using a mill to obtain modified industrial byproduct gypsum, wherein the 80 mu m negative pressure sieve residue of the modified industrial byproduct gypsum is less than 2%;
0.3kg of polycarboxylic acid (high efficiency water reducing agent, powder), 0.1kg of sodium silicate (powder) and 0.1kg of melamine (powder) are uniformly mixed by a mixer to prepare the additive, wherein the ratio of the polycarboxylic acid to the sodium silicate to the melamine is 3:1: 1.
12) 20kg of modified industrial by-product gypsum, 12kg of portland cement clinker and 0.5kg of additive are ground together by a ball mill, and 68kg of granulated blast furnace slag powder (the specific surface area is more than or equal to 450 m) is added2/kg) is stirred and mixed evenly to prepare the solid waste filling cementing material with the specific surface area more than or equal to 420m2The screen residue of a negative pressure screen with the particle size of 80 mu m is less than 1 percent per kg.
2) Preparation of industrial solid waste base inorganic paste filling material
21) Taking slag with the moisture content of less than or equal to 10 wt% and the maximum particle size of less than 400, coarsely crushing the slag by using a jaw crusher, and finely crushing the slag by using a sand making machine to prepare coarse aggregate, wherein the maximum particle size of the coarse aggregate is less than 8mm, the average particle size of the coarse aggregate is less than 5mm, and the content of particles with the particle size of 1.00-4.75 mm in the gradation is 50-70%;
the fly ash is dried in the sun until the water content is less than or equal to 6 percent, and then screened by a screening machine to prepare fine aggregate, the fineness of which is 80 mu m, and the residue of a negative pressure screen is less than 15 percent.
22) 53.5kg of coarse aggregate, 15kg of fine aggregate and 6.5kg of solid waste filling cementing material are mixed to prepare the industrial solid waste based inorganic paste filling material which is marked as M2.
II) quick filling method of industrial solid waste base inorganic paste filling material
The ground vertical feeding holes are arranged in a ground drilling mode, the hole diameter is 200mm (generally 180-230 mm), KN with the thickness of 30mm (generally 25-35 mm) and a 60-wear-resistant composite steel pipe are installed outside the pipe wall after hole forming, finally P.O 42.5.5 portland cement is used for wall filling and reinforcing to form the ground feeding holes, a cross section view is shown in figure 3, the ground feeding holes are simple in construction process, low in technical requirement, small in pipeline abrasion and low in investment, and under special conditions, other solid materials can be conveyed through the feeding holes, one-space-multiple purposes are achieved, and requirements of various mines are fully met.
The step of filling the goaf comprises the steps of arranging a sealing wall at the opening of the goaf to enclose the goaf into a closed space, and arranging a reserved grouting hole for a pipeline to pass through on the sealing wall. The sealing wall comprises a metal net covering the whole cross section of the goaf, a single support for supporting the metal net and a covering barrier layer covering the metal net (generally, a carbon steel metal net with the aperture of 50-100 mm and the wire diameter of 3-5 mm and plastic woven cloth with the tensile load of more than or equal to 600N/50mm are selected). The joint of the closed wall and the rock wall or the coal wall is reinforced and closed by a sand bag or a coal cinder bag. The reserved grouting holes are formed by reserving or drilling holes at the upper part of the goaf close to the top plate and paving filling pipelines, and the distance between the tail ends of the filling pipelines and the sealing wall is 20-30 m. The filling airtight wall has the advantages of simple structure process, high speed, low cost and low requirements on construction materials such as metal meshes and plastic woven cloth, and can meet the airtight requirements of underground rapid filling of goafs.
The method comprises the steps of conveying an industrial solid waste base inorganic paste filling material to an underground solid material storage bin through a ground feeding hole, conveying 25kg of mine water to a horizontal double-shaft mortar mixer to be uniformly mixed, conveying the obtained paste filling slurry to a rapid filling system through a high-pressure pump and a conveying pipeline, and finally injecting the paste filling slurry into a goaf through a reserved grouting hole through a reserved pipeline.
Wherein the weight ratio of the coarse aggregate, the fine aggregate, the solid waste filling cementing material and the mine water in the industrial solid waste base inorganic paste filling material is 53.5: 15: 6.5: 25;
the high-pressure pump is an explosion-proof concrete delivery pump for the mine, the pumping pressure is 25Mpa, the horizontal delivery distance is 320-500 m, and the maximum flow is 28m3H; the conveying pipeline is a wear-resistant steel pipe with the pipe diameter of 80-100 mm;
the rapid filling system mainly comprises 2 quick filling systems and 5 quick filling systems3The storage stirring module and the high-pressure pumping system module form, an underground explosion-proof rubber-tyred vehicle is carried on, the pumping pressure of the high-pressure pumping system module is 20Mpa, the horizontal conveying distance is 280-320 m, and the maximum flow is 17m3/h；
The rapid filling system has the characteristics of modularization and integration, and mainly comprises 1-4 material storage stirring modules, 1 high-pressure pumping system module, a connecting pipeline, other auxiliary equipment modules and the like, wherein the modules can be combined and integrated as required, a rubber-tyred vehicle can be used for manufacturing the mobile rapid filling system, or a semi-fixed rapid filling system is arranged in a roadway near a goaf, and the technological process of the rapid filling system is shown in a figure 4. Compared with the existing filling process, the rapid filling system can freely combine the modules according to the requirements to manufacture a movable or semi-fixed filling system, is arranged nearby a region to be filled, can be matched with an underground pulping pumping system for use, and can also be used independently; the combination of modularization and integration enables the rapid filling system to have wider use space, and provides safer, more efficient and faster technical methods for underground rapid filling, fixed-point quantitative filling and underground emergency treatment.
The invention builds the pulping station underground, has simple equipment, small occupied area and less investment, can determine the pulp amount according to the requirement, can meet the requirements of quick and small-scale underground filling and grouting, can install a secondary pressurizing and pumping system at a proper position according to the requirement when the grouting pressure is insufficient, can completely meet the requirement of underground long-distance conveying, simultaneously shortens the interval conveying distance by a modularized conveying process, reduces the performance requirement on the preparation of filling pulp, and is convenient for equipment maintenance and repair.
Example 3 preparation method of Industrial solid waste base inorganic paste filling Material
Preparation method of industrial solid waste base inorganic paste filling material
1) Preparation of solid waste filling cementing material
11) Taking phosphogypsum with the moisture content of 12.1 wt%, airing until the moisture content is 7.7 wt%, conveying the phosphogypsum into a mill by using a belt conveyor, carrying out coarse grinding processing, heating and drying by using circulating hot air until the moisture content is 2.9 wt%, continuously calcining for 1.5h at 190 ℃, and finally grinding by using a pulverizer to prepare modified industrial byproduct gypsum, wherein the 80 mu m negative pressure sieve residue of the modified industrial byproduct gypsum is less than 2%;
0.2kg of polycarboxylic acid (high efficiency water reducing agent, powder), 0.05kg of sodium silicate (powder) and 0.05kg of melamine (powder) are uniformly mixed by a mixer to prepare the additive, wherein the ratio of the polycarboxylic acid to the sodium silicate to the melamine is 2:0.5: 0.5.
12) 18kg of modified industrial by-product gypsum, 16kg of portland cement clinker and 0.15kg of admixture are taken to be processed and crushed together by a ball mill, and then 64kg of granulated blast furnace slag powder (the specific surface area is more than or equal to 450 m) is added2/kg) is stirred and mixed evenly to prepare the solid waste filling cementing material with the specific surface area more than or equal to 420m2The screen residue of a negative pressure screen with the particle size of 80 mu m is less than 1 percent per kg.
2) Preparation of industrial solid waste base inorganic paste filling material
21) Taking the building garbage with the moisture content of less than or equal to 10 wt% and the maximum particle size of less than 400, coarsely crushing the building garbage by using a jaw crusher, and finely crushing the building garbage by using a sand making machine to prepare coarse aggregate, wherein the maximum particle size is less than 8mm, the average particle size is less than 5mm, and the content of particles with the particle size of 1.00-4.75 mm in the grading is 50-70%;
drying loess until the water content is less than 6%, sieving with a sieving machine to obtain fine aggregate with fineness of 80 μm and negative pressure sieve residue of less than 15%.
22) 57.5kg of coarse aggregate, 16.5kg of fine aggregate and 4.0kg of solid waste filling cementing material are mixed to prepare the industrial solid waste based inorganic paste filling material, which is marked as M3.
II) quick filling method of industrial solid waste base inorganic paste filling material
The ground vertical feeding holes are arranged in a ground drilling mode, the hole diameter is 200mm (generally 180-230 mm), KN with the thickness of 30mm (generally 25-35 mm) and a 60-wear-resistant composite steel pipe are installed outside the pipe wall after hole forming, finally P.O 42.5.5 portland cement is used for wall filling and reinforcing to form the ground feeding holes, a cross section view is shown in figure 3, the ground feeding holes are simple in construction process, low in technical requirement, small in pipeline abrasion and low in investment, and under special conditions, other solid materials can be conveyed through the feeding holes, one-space-multiple purposes are achieved, and requirements of various mines are fully met.
The step of filling the goaf comprises the steps of arranging a sealing wall at the opening of the goaf to enclose the goaf into a closed space, and arranging a reserved grouting hole for a pipeline to pass through on the sealing wall. The sealing wall comprises a metal net covering the whole cross section of the goaf, a single support for supporting the metal net and a covering barrier layer covering the metal net (generally, a carbon steel metal net with the aperture of 50-100 mm and the wire diameter of 3-5 mm and plastic woven cloth with the tensile load of more than or equal to 600N/50mm are selected). The joint of the closed wall and the rock wall or the coal wall is reinforced and closed by a sand bag or a coal cinder bag. The reserved grouting holes are formed by reserving or drilling holes at the upper part of the goaf close to the top plate and paving filling pipelines, and the distance between the tail ends of the filling pipelines and the sealing wall is 20-30 m. The filling airtight wall has the advantages of simple structure process, high speed, low cost and low requirements on construction materials such as metal meshes and plastic woven cloth, and can meet the airtight requirements of underground rapid filling of goafs.
The method comprises the steps of conveying an industrial solid waste base inorganic paste filling material to an underground solid material storage bin through a ground feeding hole, conveying 32kg of mine water to a horizontal double-shaft mortar mixer to be uniformly mixed, conveying the obtained paste filling slurry to a rapid filling system through a high-pressure pump and a conveying pipeline, and finally injecting the paste filling slurry into a goaf through a reserved grouting hole through a reserved pipeline.
Wherein the weight ratio of the coarse aggregate, the fine aggregate, the solid waste filling cementing material and the mine water in the industrial solid waste base inorganic paste filling material is 57.5: 16.5: 4: 32, a first step of removing the first layer;
the high-pressure pump is an explosion-proof concrete delivery pump for the mine, the pumping pressure is 25Mpa, the horizontal delivery distance is 320-500 m, and the maximum flow is 28m3H; the conveying pipeline is a wear-resistant steel pipe with the pipe diameter of 80-100 mm;
the rapid filling system mainly comprises 2 quick filling systems and 5 quick filling systems3The storage stirring module and the high-pressure pumping system module form, an underground explosion-proof rubber-tyred vehicle is carried on, the pumping pressure of the high-pressure pumping system module is 20Mpa, the horizontal conveying distance is 280-320 m, and the maximum flow is 17m3/h；
Referring to fig. 4, the fast filling system has the characteristics of modularization and integration, and mainly comprises 1-4 material storage stirring modules, 1 high-pressure pumping system module, a connecting pipeline and other auxiliary equipment modules, and the like, wherein the modules can be combined and integrated as required, a mobile fast filling system can be manufactured by using a rubber-tyred vehicle, or a semi-fixed fast filling system can be manufactured by arranging the modules in a roadway near a goaf, and the technological process of the fast filling system is shown in fig. 4. Compared with the existing filling process, the rapid filling system can freely combine the modules according to the requirements to manufacture a movable or semi-fixed filling system, is arranged nearby a region to be filled, can be matched with an underground pulping pumping system for use, and can also be used independently; the combination of modularization and integration enables the rapid filling system to have wider use space, and provides safer, more efficient and faster technical methods for underground rapid filling, fixed-point quantitative filling and underground emergency treatment.
The invention builds the pulping station underground, has simple equipment, small occupied area and less investment, can determine the pulp amount according to the requirement, can meet the requirements of quick and small-scale underground filling and grouting, can install a secondary pressurizing and pumping system at a proper position according to the requirement when the grouting pressure is insufficient, can completely meet the requirement of underground long-distance conveying, simultaneously shortens the interval conveying distance by a modularized conveying process, reduces the performance requirement on the preparation of filling pulp, and is convenient for equipment maintenance and repair.
Example 4 preparation method of Industrial solid waste base inorganic paste filling Material
Preparation method of industrial solid waste base inorganic paste filling material
1) Preparation of solid waste filling cementing material
11) Taking desulfurized gypsum with the moisture content of 12.3 wt%, airing until the moisture content is 7.8 wt%, conveying the desulfurized gypsum into a mill by using a belt conveyor, carrying out coarse grinding processing, heating and drying by using circulating hot air until the moisture content is 2.6 wt%, continuously calcining for 1h at 185 ℃, and finally grinding by using a mill to obtain modified industrial byproduct gypsum, wherein the 80 mu m negative pressure sieve residue of the modified industrial byproduct gypsum is less than 2%;
0.1kg of polycarboxylic acid (high efficiency water reducing agent, powder), 0.08kg of sodium silicate (powder) and 0.07kg of melamine (powder) are uniformly mixed by a mixer to prepare the additive, wherein the ratio of the polycarboxylic acid to the sodium silicate to the melamine is 1:0.8: 0.7.
12) 17kg of modified industrial by-product gypsum, 13kg of portland cement clinker and 0.25kg of additive are ground together by a ball mill, and 73kg of granulated blast furnace slag powder (the specific surface area is more than or equal to 420 m) is added2/kg) is stirred and mixed evenly to prepare the solid waste filling cementing material with the specific surface area more than or equal to 400m2The screen residue of a negative pressure screen with the particle size of 80 mu m is less than 1 percent per kg.
2) Preparation of industrial solid waste base inorganic paste filling material
21) Taking coal gangue and building garbage (mixed according to the mass ratio of 1:1) with the water content of less than or equal to 10 wt% and the maximum particle size of less than 400, coarsely crushing the coal gangue and the building garbage by a jaw crusher, and finely crushing the coal gangue and the building garbage by a sand making machine to prepare coarse aggregate, wherein the maximum particle size of the coarse aggregate is less than 8mm, the average particle size of the coarse aggregate is less than 5mm, and the content of particles with the particle size of 1.00-4.75 mm in the gradation is 50-70;
drying loess until the water content is less than 6%, sieving with a sieving machine to obtain fine aggregate with fineness of 80 μm and negative pressure sieve residue of less than 15%.
22) 50kg of coarse aggregate, 25kg of fine aggregate and 8.0kg of solid waste filling cementing material are mixed to prepare the industrial solid waste based inorganic paste filling material which is marked as M4.
II) quick filling method of industrial solid waste base inorganic paste filling material
The ground vertical feeding holes are arranged in a ground drilling mode, the hole diameter is 200mm (generally 180-230 mm), KN with the thickness of 30mm (generally 25-35 mm) and a 60-wear-resistant composite steel pipe are installed outside the pipe wall after hole forming, finally P.O 42.5.5 portland cement is used for wall filling and reinforcing to form the ground feeding holes, a cross section view is shown in figure 3, the ground feeding holes are simple in construction process, low in technical requirement, small in pipeline abrasion and low in investment, and under special conditions, other solid materials can be conveyed through the feeding holes, one-space-multiple purposes are achieved, and requirements of various mines are fully met.
The step of filling the goaf comprises the steps of arranging a sealing wall at the opening of the goaf to enclose the goaf into a closed space, and arranging a reserved grouting hole for a pipeline to pass through on the sealing wall. The sealing wall comprises a metal net covering the whole cross section of the goaf, a single support for supporting the metal net and a covering barrier layer covering the metal net (generally, a carbon steel metal net with the aperture of 50-100 mm and the wire diameter of 3-5 mm and plastic woven cloth with the tensile load of more than or equal to 600N/50mm are selected). The joint of the closed wall and the rock wall or the coal wall is reinforced and closed by a sand bag or a coal cinder bag. The reserved grouting holes are formed by reserving or drilling holes at the upper part of the goaf close to the top plate and paving filling pipelines, and the distance between the tail ends of the filling pipelines and the sealing wall is 20-30 m. The filling airtight wall has the advantages of simple structure process, high speed, low cost and low requirements on construction materials such as metal meshes and plastic woven cloth, and can meet the airtight requirements of underground rapid filling of goafs.
As shown in figure 1, industrial solid waste base inorganic paste filling material is conveyed to an underground solid material storage bin through a ground feeding hole, 30kg of mine water is conveyed to a horizontal double-shaft mortar mixer to be uniformly mixed, the obtained paste filling slurry is conveyed to a rapid filling system through a high-pressure pump and a conveying pipeline, and finally the paste filling slurry is injected into a goaf through a reserved pipeline through a reserved grouting hole.
Wherein the weight ratio of the coarse aggregate, the fine aggregate, the solid waste filling cementing material and the mine water in the industrial solid waste base inorganic paste filling material is 50: 25: 8: 30, of a nitrogen-containing gas;
the high-pressure pump is an explosion-proof concrete delivery pump for the mine, the pumping pressure is 25Mpa, the horizontal delivery distance is 320-500 m, and the maximum flow is 28m3H; the conveying pipeline is a wear-resistant steel pipe with the pipe diameter of 80-100 mm;
the rapid filling system mainly comprises 2 quick filling systems and 5 quick filling systems3The storage stirring module and the high-pressure pumping system module form, an underground explosion-proof rubber-tyred vehicle is carried on, the pumping pressure of the high-pressure pumping system module is 20Mpa, the horizontal conveying distance is 280-320 m, and the maximum flow is 17m3/h；
The rapid filling system has the characteristics of modularization and integration, and mainly comprises 1-4 material storage stirring modules, 1 high-pressure pumping system module, a connecting pipeline, other auxiliary equipment modules and the like, wherein the modules can be combined and integrated as required, a rubber-tyred vehicle can be used for manufacturing the mobile rapid filling system, or a semi-fixed rapid filling system is arranged in a roadway near a goaf, and the technological process of the rapid filling system is shown in a figure 4. Compared with the existing filling process, the rapid filling system can freely combine the modules according to the requirements to manufacture a movable or semi-fixed filling system, is arranged nearby a region to be filled, can be matched with an underground pulping pumping system for use, and can also be used independently; the combination of modularization and integration enables the rapid filling system to have wider use space, and provides safer, more efficient and faster technical methods for underground rapid filling, fixed-point quantitative filling and underground emergency treatment.
The invention builds the pulping station underground, has simple equipment, small occupied area and less investment, can determine the pulp amount according to the requirement, can meet the requirements of quick and small-scale underground filling and grouting, can install a secondary pressurizing and pumping system at a proper position according to the requirement when the grouting pressure is insufficient, can completely meet the requirement of underground long-distance conveying, simultaneously shortens the interval conveying distance by a modularized conveying process, reduces the performance requirement on the preparation of filling pulp, and is convenient for equipment maintenance and repair.
Example 5 preparation method of Industrial solid waste base inorganic paste filling Material
Preparation method of industrial solid waste base inorganic paste filling material
1) Preparation of solid waste filling cementing material
11) Taking phosphogypsum with the moisture content of 12.3 wt%, airing until the moisture content is 7.6 wt%, conveying the phosphogypsum into a mill by using a belt conveyor, carrying out coarse grinding processing, heating and drying by using circulating hot air until the moisture content is 2.8 wt%, continuously calcining for 2h at 195 ℃, and finally grinding by using the mill to prepare modified industrial byproduct gypsum, wherein the 80 mu m negative pressure sieve residue of the modified industrial byproduct gypsum is less than 2%;
0.2kg of polycarboxylic acid (high efficiency water reducing agent, powder), 0.05kg of sodium silicate (powder) and 0.05kg of melamine (powder) are uniformly mixed by a mixer to prepare the additive, wherein the ratio of the polycarboxylic acid to the sodium silicate to the melamine is 2:0.5: 0.5.
12) Taking 16kg of modified industrial byproduct gypsum, 14kg of portland cement clinker and 0.3kg of additive, processing and crushing the gypsum, the portland cement clinker and the additive by a ball mill, and then adding 72kg of granulated blast furnace slag powder (the specific surface area is more than or equal to 450 m)2/kg) is stirred and mixed evenly to prepare the solid waste filling cementing material with the specific surface area more than or equal to 420m2The screen residue of a negative pressure screen with the particle size of 80 mu m is less than 1 percent per kg.
2) Preparation of industrial solid waste base inorganic paste filling material
21) Taking waste rocks, furnace slag and construction waste (in a mass ratio of 1:1:1) with the water content of less than or equal to 10 wt% and the maximum particle size of less than 400, coarsely crushing the waste rocks, the furnace slag and the construction waste by using a jaw crusher, finely crushing the waste rocks, the furnace slag and the construction waste by using a sand making machine to prepare coarse aggregate, wherein the maximum particle size of the coarse aggregate is less than 8mm, the average particle size of the coarse aggregate is less than 5mm, and the content of particles with the particle size of 1.00-4.75;
taking fly ash and loess (mixed according to the mass ratio of 1:1), airing until the water content is less than or equal to 6%, and then sieving by a sieving machine to prepare fine aggregate with the fineness of 80 mu m and the sieved residue of a negative pressure sieve of less than 15%.
22) 65kg of coarse aggregate, 17.5kg of fine aggregate and 3.0kg of solid waste filling cementing material are mixed to prepare the industrial solid waste based inorganic paste filling material, which is marked as M5.
II) quick filling method of industrial solid waste base inorganic paste filling material
The ground vertical feeding holes are arranged in a ground drilling mode, the hole diameter is 200mm (generally 180-230 mm), KN with the thickness of 30mm (generally 25-35 mm) and a 60-wear-resistant composite steel pipe are installed outside the pipe wall after hole forming, finally P.O 42.5.5 portland cement is used for wall filling and reinforcing to form the ground feeding holes, a cross section view is shown in figure 3, the ground feeding holes are simple in construction process, low in technical requirement, small in pipeline abrasion and low in investment, and under special conditions, other solid materials can be conveyed through the feeding holes, one-space-multiple purposes are achieved, and requirements of various mines are fully met.
The step of filling the goaf comprises the steps of arranging a sealing wall at the opening of the goaf to enclose the goaf into a closed space, and arranging a reserved grouting hole for a pipeline to pass through on the sealing wall. The sealing wall comprises a metal net covering the whole cross section of the goaf, a single support for supporting the metal net and a covering barrier layer covering the metal net (generally, a carbon steel metal net with the aperture of 50-100 mm and the wire diameter of 3-5 mm and plastic woven cloth with the tensile load of more than or equal to 600N/50mm are selected). The joint of the closed wall and the rock wall or the coal wall is reinforced and closed by a sand bag or a coal cinder bag. The reserved grouting holes are formed by reserving or drilling holes at the upper part of the goaf close to the top plate and paving filling pipelines, and the distance between the tail ends of the filling pipelines and the sealing wall is 20-30 m. The filling airtight wall has the advantages of simple structure process, high speed, low cost and low requirements on construction materials such as metal meshes and plastic woven cloth, and can meet the airtight requirements of underground rapid filling of goafs.
The method comprises the steps of conveying an industrial solid waste base inorganic paste filling material to an underground solid material storage bin through a ground feeding hole, conveying 20kg of mine water to a horizontal double-shaft mortar mixer to be uniformly mixed, conveying the obtained paste filling slurry to a rapid filling system through a high-pressure pump and a conveying pipeline, and finally injecting the paste filling slurry into a goaf through a reserved grouting hole through a reserved pipeline.
Wherein the weight ratio of the coarse aggregate, the fine aggregate, the solid waste filling cementing material and the mine water in the industrial solid waste base inorganic paste filling material is 65: 17.5: 3: 20;
the high-pressure pump is an explosion-proof concrete delivery pump for the mine, the pumping pressure is 25Mpa, the horizontal delivery distance is 320-500 m, and the maximum flow is 28m3H; the conveying pipeline is a wear-resistant steel pipe with the pipe diameter of 80-100 mm;
the rapid filling system mainly comprises 2 quick filling systems and 5 quick filling systems3The storage stirring module and the high-pressure pumping system module form, an underground explosion-proof rubber-tyred vehicle is carried on, the pumping pressure of the high-pressure pumping system module is 20Mpa, the horizontal conveying distance is 280-320 m, and the maximum flow is 17m3/h；
The rapid filling system has the characteristics of modularization and integration, and mainly comprises 1-4 material storage stirring modules, 1 high-pressure pumping system module, a connecting pipeline, other auxiliary equipment modules and the like, wherein the modules can be combined and integrated as required, a rubber-tyred vehicle can be used for manufacturing the mobile rapid filling system, or a semi-fixed rapid filling system is arranged in a roadway near a goaf, and the technological process of the rapid filling system is shown in a figure 4. Compared with the existing filling process, the rapid filling system can freely combine the modules according to the requirements to manufacture a movable or semi-fixed filling system, is arranged nearby a region to be filled, can be matched with an underground pulping pumping system for use, and can also be used independently; the combination of modularization and integration enables the rapid filling system to have wider use space, and provides safer, more efficient and faster technical methods for underground rapid filling, fixed-point quantitative filling and underground emergency treatment.
The invention builds the pulping station underground, has simple equipment, small occupied area and less investment, can determine the pulp amount according to the requirement, can meet the requirements of quick and small-scale underground filling and grouting, can install a secondary pressurizing and pumping system at a proper position according to the requirement when the grouting pressure is insufficient, can completely meet the requirement of underground long-distance conveying, simultaneously shortens the interval conveying distance by a modularized conveying process, reduces the performance requirement on the preparation of filling pulp, and is convenient for equipment maintenance and repair.
Example 6 Properties of Industrial solid waste inorganic paste filling Material
Preparation of comparative inorganic paste filling Material
The inorganic paste filling material was prepared by the method for preparing the industrial solid waste based inorganic paste filling material of example 1, except that the solid waste filling cementing material was replaced with p.s.a. 32.5 slag cement, and the obtained inorganic paste filling material was labeled DM 1.
The inorganic paste filling material was prepared by the method for preparing the industrial solid waste inorganic paste filling material in example 1, except that P.O 42.5.5 ordinary portland cement was used instead of the solid waste filling cement, and the obtained inorganic paste filling material was labeled as DM 2.
The industrial solid waste base inorganic paste filling materials and the inorganic paste filling materials DM1 and DM2 prepared in the examples 1 to 5 are respectively added with the mine water with the corresponding amount in the examples 1 to 5, stirred and mixed uniformly, then grouting filling is carried out, and then uniaxial compressive strength tests are respectively carried out, wherein the specific detection results are shown in the following table:
TABLE 1 comparison of uniaxial compressive strengths of slag cements with cementitious materials
Filling material 7 days Strength (MPa) 28 days strength (MPa)
M1 4.54 7.38
M2 3.72 6.41
M3 4.11 7.03
M4 4.12 7.15
M5 4.27 7.21
DM1 3.46 6.25
DM2 2.82 4.76
As can be seen from Table 1, the industrial solid waste inorganic paste filling material prepared by the invention has good uniaxial compressive strength.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The industrial solid waste based inorganic paste filling material is characterized in that the raw materials for preparing the effective components of the industrial solid waste based inorganic paste filling material comprise the following components in parts by weight: 50-65 parts of coarse aggregate, 15-25 parts of fine aggregate and 3-8 parts of solid waste filling cementing material.
2. The industrial solid waste based inorganic paste filling material of claim 1, wherein the solid waste filling cementing material is prepared by crushing 15 to 20 parts of modified industrial byproduct gypsum, 12 to 16 parts of portland cement clinker and 0.15 to 0.5 part of additive, adding 64 to 73 parts of granulated blast furnace slag powder, and mixing uniformly.
3. The industrial solid waste inorganic paste filling material according to claim 2,
the modified industrial byproduct gypsum is prepared by calcining gypsum at 180-200 ℃ for more than 1 h;
the additive is prepared by mixing 1-3 parts of polycarboxylic acid, 0.5-1 part of sodium silicate and 0.5-1 part of melamine.
4. The industrial solid waste-based inorganic paste filling material according to any one of claims 1 to 3, wherein the specific surface area of the solid waste filling and cementing material is not less than 40m2The screen residue of a negative pressure screen with the particle size of 80 mu m is less than 1 percent per kg.
5. The industrial solid waste inorganic paste filling material according to claim 1,
the coarse aggregate is at least one of gangue, slag and construction waste;
the maximum grain size of the coarse aggregate is less than or equal to 8mm, and the average grain size is less than or equal to 5 mm.
6. The industrial solid waste base inorganic paste filling material according to claim 1, 2, 3 or 5, wherein the fine aggregate is fly ash and/or loess;
the fineness of the fine aggregate is 80 mu m, and the residue of the negative pressure sieve is less than 15%.
7. The method for preparing an industrial solid waste based inorganic paste filling material according to any one of claims 1 to 6, wherein it is prepared by mixing all raw materials.
8. A method for quickly filling an industrial solid waste base inorganic paste filling material is characterized in that the industrial solid waste base inorganic paste filling material of any one of claims 1 to 6 is conveyed to a downhole through a ground feeding hole and then is uniformly mixed with mine water, and the obtained paste filling slurry is used for filling a goaf.
9. The method for rapidly filling an industrial solid waste base inorganic paste filling material according to claim 8, wherein the step of filling the goaf comprises the steps of arranging a sealing wall at the mouth of the goaf to enclose the goaf into a closed space, and arranging a reserved grouting hole for a pipeline to pass through on the sealing wall.
10. The method for rapidly filling an industrial solid waste based inorganic paste filling material according to claim 9, wherein the sealing wall includes a metal mesh covering the entire cross-section of the gob, a single support for supporting the metal mesh, and a covering barrier layer covering the metal mesh.
CN202110110292.4A 2021-01-27 2021-01-27 Industrial solid waste base inorganic paste filling material, preparation method and rapid filling method Pending CN112897963A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113893933A (en) * 2021-10-21 2022-01-07 中煤能源研究院有限责任公司 Aboveground crushing and underground pulping system and using method
CN116835950A (en) * 2022-03-23 2023-10-03 国家能源投资集团有限责任公司 Mining sealing material and application thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105481314A (en) * 2015-12-01 2016-04-13 安徽理工大学 Coal mine paste-like filling material using construction waste, and preparation and filling method thereof
US20160348507A1 (en) * 2014-05-08 2016-12-01 China University Of Mining And Technology Water-preserved-mining roof-contacted filling method for controlling fissure of overlying strata and surface subsidence
CN108915765A (en) * 2018-07-02 2018-11-30 北京科技大学 A kind of underground crude tailings-barren rock Paste-filling System and placement method
CN110228990A (en) * 2019-07-08 2019-09-13 山东大学 A kind of preparation method of full solid waste upper flow regime Paste-like body filler
CN111689753A (en) * 2020-06-29 2020-09-22 河北充填采矿技术有限公司 Gangue paste cementing material and preparation method thereof, gangue paste filling material and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160348507A1 (en) * 2014-05-08 2016-12-01 China University Of Mining And Technology Water-preserved-mining roof-contacted filling method for controlling fissure of overlying strata and surface subsidence
CN105481314A (en) * 2015-12-01 2016-04-13 安徽理工大学 Coal mine paste-like filling material using construction waste, and preparation and filling method thereof
CN108915765A (en) * 2018-07-02 2018-11-30 北京科技大学 A kind of underground crude tailings-barren rock Paste-filling System and placement method
CN110228990A (en) * 2019-07-08 2019-09-13 山东大学 A kind of preparation method of full solid waste upper flow regime Paste-like body filler
CN111689753A (en) * 2020-06-29 2020-09-22 河北充填采矿技术有限公司 Gangue paste cementing material and preparation method thereof, gangue paste filling material and preparation method thereof

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
张保良: "张赵煤矿尾砂膏体充填技术研究与应用", 《矿业研究与开发》 *
杨金铎: "《装饰装修材料 第4版》", 30 June 2020, 中国建材工业出版社 *
沙明元: "《斜井工程隧道掘进机施工技术》", 31 October 2016, 中国铁道出版社 *
陈益民: "《高性能水泥基础研究-973项目研究进展》", 30 November 2004, 中国纺织出版社 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113893933A (en) * 2021-10-21 2022-01-07 中煤能源研究院有限责任公司 Aboveground crushing and underground pulping system and using method
CN113893933B (en) * 2021-10-21 2023-03-14 中煤能源研究院有限责任公司 Aboveground crushing and underground pulping system and using method
CN116835950A (en) * 2022-03-23 2023-10-03 国家能源投资集团有限责任公司 Mining sealing material and application thereof

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