CN113955986B - Composite filling material for exciting gangue solidification and preparation method thereof - Google Patents

Composite filling material for exciting gangue solidification and preparation method thereof Download PDF

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CN113955986B
CN113955986B CN202111334599.9A CN202111334599A CN113955986B CN 113955986 B CN113955986 B CN 113955986B CN 202111334599 A CN202111334599 A CN 202111334599A CN 113955986 B CN113955986 B CN 113955986B
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gangue
slurry
curing agent
powder
composite
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CN113955986A (en
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柏夏
陈艳
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Jiangsu Boxia Mining Technology Co ltd
YANGZHOU ZHONGKUANG BUILDING NEW MATERIAL TECHNOLOGY CO LTD
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Jiangsu Boxia Mining Technology Co ltd
YANGZHOU ZHONGKUANG BUILDING NEW MATERIAL TECHNOLOGY 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
    • C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
    • 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
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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
    • 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

Abstract

A composite filling material for exciting solidifying gangue is prepared from the slurry of gangue A and slurry of gangue BThe material gangue slurry consists of gangue particles, gangue powder, composite excitation curing agent A and water; the material B gangue slurry comprises gangue particles, gangue powder, a composite excitation curing agent B material and water; the composite excitation curing agent A material is prepared from SiO 2 And the material A additive consists of a composite excitation curing agent B material consisting of CaO and a material B additive. The invention provides a coal gangue curing agent filling material suitable for goaf filling, wherein the curing agent and coal gangue powder cooperatively react to excite the activity of coal gangue, so that the full utilization of the coal gangue is realized, the physical and mechanical properties of the filling material are improved, and the defects of limited pumping performance, uncontrollable setting time and insufficient utilization of the coal gangue of the traditional coal gangue filling material are overcome.

Description

Composite filling material for exciting gangue solidification and preparation method thereof
Technical Field
The invention relates to the technical field of coal gangue resource utilization, in particular to a composite filling material for exciting coal gangue solidification and a preparation method thereof.
Background
Gangue is rock with lower carbon content and harder than coal and is the general term of solid waste discharged in the coal mining and washing processes. As a large country for coal exploitation, the coal gangue emission in China accounts for about 10% of the coal yield in the current year, and the emission is huge. The discharged large amount of gangue not only occupies a large amount of land and farmland, but also pollutes the environment. The emission reduction of the gangue is imperative to realize harmless and recycling treatment of the gangue. The method combines the gangue with the cementing material, and is applied to the engineering field in the important direction of harmless and recycling treatment of the gangue:
(1) The gangue is applied to cement-based materials, mainly used as mixture, admixture, aggregate and the like, and is prepared into gangue composite cement, and concrete materials including gangue-fly ash foamed concrete, road cement stabilized gangue mixture, heat-insulating concrete, permeable concrete, aerated concrete, mixed mortar and the like, or used as raw materials to replace clay for preparing cement clinker. The coal gangue utilization mode has the advantages of insufficient excitation of the activity of the coal gangue, low utilization rate of the coal gangue, limited application scene by material performance and indexes and limited application amount, so that the utilization amount of the coal gangue is reduced.
(2) Adding cementing materials such as cement and the like into gangue to prepare pasty thick materials serving as filling materials for filling goaf of coal mine. The coal gangue paste filling mainly faces the problem of insufficient pumpability and stability. Among them, pumpability is closely related to the physical properties of the mixture, such as density, fraction composition, particle shape, etc. The water consumption is small, the material density is high, the pumping resistance is high, the pipeline is easy to be blocked, the manual cleaning is consumed, and the construction period is prolonged. When the water consumption is large, the coagulation time is long and the strength is low. Meanwhile, the coal gangue paste filling has the defects of large cement consumption, high cost and low gangue utilization rate.
The goaf is filled by using coal gangue, is an important component of the current green mining of the coal mine, and can achieve the following purposes: (1) the waste dump is reduced, the solid waste pollution is reduced, and the economic burden caused by the environmental treatment and occupation of land purchase cost of the waste dump is reduced; (2) the environmental problems caused by ground subsidence and collapse are reduced; (3) the two-lane roadway retaining effect is ensured, the roadway retaining cost is reduced, and the coal mining rate is improved. The coal gangue is utilized to fill the goaf, so that the use amount of the gangue is large, and the method is an important way for realizing harmless and recycling treatment of the coal gangue.
Disclosure of Invention
The technical problems to be solved are as follows: aiming at the problems in the prior art, the invention provides a composite filling material for exciting the curing of coal gangue and a preparation method thereof, and provides a coal gangue curing agent filling material suitable for goaf filling, wherein the curing agent and coal gangue powder react synergistically to excite the activity of the coal gangue, so that the full utilization of the coal gangue is realized, the physical and mechanical properties of the filling material are improved, and the defects of limited pumping performance, uncontrollable setting time and insufficient utilization of the coal gangue of the traditional coal gangue filling material are overcome.
The technical scheme is as follows: the composite filling material for exciting the coal gangue solidification comprises the following raw materials by mass of a first material gangue slurry and an ethyl material gangue slurry, wherein the first material gangue slurry comprises gangue particles and gangueThe mass ratio of the gangue powder to the gangue particles is (1-5) 1, the mass ratio of the gangue powder to the composite excitation curing agent A is (1-5) 1, and the mass ratio of the water to the composite excitation curing agent A is (1-10) 1; the material B gangue slurry comprises gangue particles, gangue powder, composite excitation curing agent B and water, wherein the mass ratio of the gangue powder to the gangue particles is (1-5) 1, the mass ratio of the gangue powder to the composite excitation curing agent B is (1-5) 1, and the mass ratio of the water to the composite excitation curing agent B is (1-10) 1; the composite excitation curing agent A material consists of 85-95 wt.% of SiO 2 And 5-15 wt.% of a material A additive, wherein the material B of the composite excitation curing agent consists of 90wt.% of CaO and 10wt.% of material B additive.
Preferably, the particle size of the gangue particles is 0.5-10 mm. The gangue is crushed into gangue particles through two stages, the fine-particle-size gangue particles are used as aggregate in the filling material, the mechanical property of the consolidated filling body is improved, and the utilization rate of the gangue during filling is improved. In addition, the gangue particles are also used as secondary raw materials for further producing gangue powder.
Preferably, the fineness of the gangue powder is 300-400 m of specific surface area 2 /kg. The gangue powder is formed by grinding gangue particles through a ball mill, and the grinding process of the ball mill can be dry grinding to form pure gangue powder or wet grinding to form gangue powder slurry. Grinding is one of modes for realizing physical excitation of coal gangue, and hydration coagulation activity of the ground coal gangue powder is improved. The gangue powder has three functions in the filling material: (1) under the dual excitation of grinding physical excitation and additive chemical excitation, the hydration and coagulation activity of the gangue powder is further improved, hydration reaction is carried out with water, and the coagulation hardening performance and mechanical property of the filling material are improved; (2) the part which does not generate hydration reaction is used as a stable solid matrix to be filled in the pore of the consolidation body, so that the physical property of the consolidation body is improved, and the utilization rate of the coal gangue is increased; (3) the gangue powder is added with water to form gangue powder slurry which is used as a pumping carrier of the gangue particles (because the density is higher than that of pure water, the gangue particles are easier to suspend in the gangue powder slurry, and pumping is facilitated).
Preferably, the first material additive is a mixture of a suspending agent, a dispersing agent and a retarder in a mass ratio of 8:1:1, and the second material additive is a mixture of a suspending agent, a dispersing agent and an accelerator in a mass ratio of 6:3:1.
The preparation method of the composite filling material for exciting the coal gangue to solidify comprises the following steps:
weighing gangue particles, gangue powder, a composite excitation curing agent A material, a composite excitation curing agent B material and water according to the proportion of each component;
step two, preparing A/B gangue slurry, wherein the preparation scheme is any one of the following three materials: (1) mixing and stirring the components of the first material gangue slurry and the second material gangue slurry at one time at a ground pulping station to form first/second material gangue slurry, and pumping the first/second material gangue slurry to a filling area respectively; (2) mixing and stirring a composite excitation curing agent A material with water, gangue powder and gangue particles to form A material gangue slurry, and mixing and stirring a composite excitation curing agent B material with water, gangue powder and gangue particles to form B material gangue slurry; (3) the ground pulping station respectively adds water into the composite excitation curing agent A/B and stirs the materials to respectively form single slurry of the materials A/B, pumps the single slurry to a filling area respectively, and then adds gangue powder and gangue particles to form gangue slurry of the materials A/B;
and thirdly, mixing and stirring the A/B material gangue slurry in a filling area, filling, and carrying out hydration reaction between the three components and water to quickly coagulate and harden to form a filling consolidation body (the A/B material gangue slurry can be prevented from solidifying for 24 hours and can ensure sufficient time to realize pumping and storage).
In the third step, the solidification and hardening reaction mainly comprises the processes of hydration dissolution, gelation solidification, strength hardening and the like, and four different hydration reactions exist (C=CaO, S=SiO 2 ，A＝Al 2 O 3 ，
Figure BDA0003350137650000035
H＝H 2 O)：
①
Figure BDA0003350137650000031
②
Figure BDA0003350137650000034
③2CS+2H→C-S-H+CH；
④
Figure BDA0003350137650000033
Of the hydration reaction product (AH) 3 ) Can further be combined with (CH) and
Figure BDA0003350137650000036
reacting to form ettringite (>
Figure BDA0003350137650000037
Figure BDA0003350137650000038
AFt), hydrated calcium silicate gel (Calcium Silicate Hydrate, abbreviated as C-S-H) and +.>
Figure BDA0003350137650000039
The calcium silicate hydrate gel (C-A-S-H) is formed by combination. The main component of the gangue is Al 2 O 3 、SiO 2 、Fe 2 O 3 The content is more than 80 percent, and CaO, mgO, na with different amounts 2 O、K 2 O、P 2 O 5 Etc. The high alkaline compound such as calcium hydroxide generated by the hydration reaction further excites the hydration and coagulation activity of gangue powder, and the high alkaline compound reacts with CaO and SiO 2 、Ca(OH) 2 Hydration to ettringite, active silicon and Ca (OH) 2 A secondary C-S-H gel is formed.
The solid matters generated by the hydration reaction of the composite filling material mainly comprise: ettringite (AFt), alumina gel (AH) 3 ) Hydrated calcium silicate gel (C-S-H) and C-A-S-H gel. Wherein ettringite has the maximum proportion, branch and columnar ettringite crystals are interweaved and connected to form a space network structure, other hydration products such as aluminum gel, hydrated calcium silicate gel and the like are filled among the interweaved ettringite crystals, and the characteristics of the calcium silicate gel are porous and do not participate in hydration productsThe gangue particles and the gangue powder are filled in the pores of the generated consolidation body, so that the compactness of the consolidation body is improved. The consolidated body macroscopic photograph, micrometer scale imaging (three-dimensional X-ray microscopic imaging) and nanometer scale morphology (scanning electron microscope) of the composite filling material prepared according to the patent are shown in figure 2.
The beneficial effects are that: compared with other related materials and technologies, the filling material of the invention has the following innovation points and advantages:
1) The gangue is solid waste discharged in the coal mining and coal washing processes, and is also a main raw material of the combined filling material: (1) from the viewpoint of raw material cost, the coal gangue is sufficient and convenient in source; (2) from the angle of the using amount of the gangue, the ratio of the gangue to the ratio in the combined filling is high, the compactness of the filling body is higher than that of the traditional gangue filling, and the environment-friendly treatment amount of the gangue solid waste is improved; (3) from the quality angle of gangue utilization, the invention can realize physical and chemical dual excitation on the gangue, fully excite hydration coagulation activity, promote the gangue to participate in hydration coagulation reaction, and simultaneously, the gangue is also used as a filling aggregate, a conveying carrier, a suspension carrier and the like, thereby improving the utilization efficiency of the gangue and realizing the full excavation of the gangue performance.
2) The invention relates to a combined filling material, which comprises the following components: the fine-particle-size gangue particles, gangue powder slurry and gangue powder curing agent slurry can be matched with a conveying system, long-distance conveying is achieved, the pumping system is limited by environmental conditions, the arrangement is flexible, and the degree of automation is high.
The single slurry is not solidified for 24 hours, is quickly solidified after being mixed, can adapt to the different requirements of filling space on parameters such as strength, setting time, pumping distance, slurry stopping wall arrangement and the like under different working conditions by adjusting the proportion of gangue particles, gangue powder and excitation curing complexing agent, realizes adjustable and controllable filling parameters, and has strong working condition adaptability.
Drawings
FIG. 1 is a view of the site of single slurry non-coagulation of the A/B gangue slurry (the site view of the A gangue slurry and the B gangue slurry are the same);
FIG. 2 is a macroscopic photograph of the consolidated body of the composite filling material according to example 2 of the present invention, a micrometer scale imaging (three-dimensional X-ray microscopy imaging) and a nanometer scale morphology (scanning electron microscope) map, wherein (a) is a macroscopic photograph of the consolidated body of the composite filling material; (b) A micrometer scale imaging map of the composite filling material; (c) Is a nanoscale morphology of the composite filling material.
Detailed Description
The invention is further described below with reference to the drawings and specific embodiments.
In the embodiment of the specification, gangue particles are formed by crushing coal gangue in two stages, and the particle size is 0.5-10 mm. The gangue particles with the fine particle size are used as aggregate in the filling material, so that the mechanical property of the consolidated filling body is improved, and the utilization rate of the gangue during filling is improved. In addition, the gangue particles are also used as secondary raw materials for further producing gangue powder.
The gangue powder is formed by grinding gangue particles through a ball mill, and the fineness of the gangue powder is controlled to be about 300-400 m in specific surface area 2 /kg. The grinding process of the ball mill can be dry grinding to form pure gangue powder, or wet grinding to form gangue powder slurry. Grinding is one of modes for realizing physical excitation of coal gangue, and hydration coagulation activity of the ground coal gangue powder is improved. The gangue powder has three functions in the filling material: (1) under the dual excitation of grinding physical excitation and additive chemical excitation, the hydration and coagulation activity of the gangue powder is further improved, hydration reaction is carried out with water, and the coagulation hardening performance and mechanical property of the filling material are improved; (2) the part which does not generate hydration reaction is used as a stable solid matrix to be filled in the pore of the consolidation body, so that the physical property of the consolidation body is improved, and the utilization rate of the coal gangue is increased; (3) the gangue powder is added with water to form gangue powder slurry which is used as a pumping carrier of the gangue particles (because the density is higher than that of pure water, the gangue particles are easier to suspend in the gangue powder slurry, and pumping is facilitated).
The composite excitation curing agent A material is prepared from SiO 2 (85-95 wt.%) and a material A additive (5-15 wt.%), and the material B is composed of CaO (90 wt.%) and a material B additive (10 wt.%). Wherein the A material additive is BX type JT1 additive (suspending agent with mass ratio of 8:1:1, min.) of new material construction and technology Co., yangzhou middlingPowder and retarder) and the material B additive is a BX type JT2 additive (a mixture of a suspending agent, a dispersing agent and an accelerator in a mass ratio of 6:3:1) of new material technology of Yangzhou middling construction.
The functions of the composite excitation curing agent mainly comprise: (1) the composite excitation curing agent A material and the composite excitation curing agent B material are mixed and then are subjected to hydration reaction with water to form a solidified body through coagulation hardening, and the solidified body has certain strength; (2) SiO contained in the composite excitation curing agent A/B material 2 And CaO and an alkaline compound generated by hydration reaction promote the gangue powder to be chemically excited, wherein the chemical excitation is one of the most effective excitation ways of the coal gangue, and can further improve the hydration coagulation activity of the gangue powder. The composite excitation curing agent A material and the composite excitation curing agent B material have the following characteristics: (1) high water-to-ash ratio: the curing agent can realize effective coagulation and solidification and generate strength under the condition of high water-solid ratio (the weight ratio of the curing agent to water is 1:1-1:10), so that the cost can be greatly saved and the pumping capacity can be effectively improved; (2) single slurry non-setting: the composite excitation curing agent A and the composite excitation curing agent B are respectively and independently added with water and stirred to form the first material single slurry and the second material single slurry, and the reaction can not occur for 24 hours, so that the filling material has abundant pumping time and storage time, and is convenient for flexible blending of subsequent procedures. (3) Rapid hardening after mixing: when the first material single pulp and the second material single pulp are mixed, the first material single pulp and the second material single pulp can be quickly coagulated and hardened, have certain strength, quickly realize filling effect, save time and accelerate engineering progress.
The three components can be adapted to the specific filling conditions and filling requirements (such as material conveying distance, filling consolidation strength requirement, setting time and the like) of the goaf through a controllable and adjustable flexible preparation scheme. The core preparation indexes mainly comprise the following components in weight sequence: (1) a water-to-solid ratio; (2) powder-solid ratio; (3) powder particle ratio; (4) gangue particle size. The index ranges and the performance rules are summarized as follows:
(1) Water-to-solid ratio: the weight ratio of water to the composite excitation curing agent is generally in the range of 1:1-10:1, the smaller the water-solid ratio is, the faster the hydration and coagulation reaction is, the shorter the coagulation time is, the higher the density and the strength of the produced consolidated body are, but the larger the dosage of the additive is, and the higher the cost is;
(2) Powder-solid ratio: the weight ratio of gangue powder to the composite excitation curing agent is generally in the range of 1:1-5:1, the powder-solid ratio mainly balances pumping performance, the utilization rate of coal gangue and the chemical excitation efficiency of gangue, and the powder-solid ratio can be larger when the water-solid ratio is larger;
(3) Powder particle ratio: the ratio of gangue powder to gangue particles is generally in the range of 1:1-5:1, and mainly balances the utilization rate of coal gangue and the compactness of the consolidated body;
(4) Gangue particle size: typically 0.5-10 mm, balances pumping capacity and crushing cost, matches delivery conditions (pumping pressure, pipe diameter, delivery distance, etc.), and the smaller the particle size, the smaller the pumping capacity requirement, but the larger the crushing cost. In addition, according to the condition of the conveying equipment, if the gangue particles are conveyed to the filling area by the belt conveying equipment, the particle size can be not limited by the pumping equipment.
Example 1
In the embodiment, the formula of the composite filling material for exciting the coal gangue to solidify is as follows, wherein the water-solid ratio is 1:1+powder-solid ratio is 2:1+powder-particle ratio is 1:1: the composite material comprises the following components in parts by mass: 2 parts of gangue particles, 2 parts of gangue powder, 1 part of composite excitation curing agent A material and 1 part of water; b, gangue slurry: 2 parts of gangue particles and 2 parts of
Gangue powder, 1 part of composite excitation curing agent B material and 1 part of water.
The preparation method of the composite filling material based on the excitation of the coal gangue solidification comprises the following steps:
(1) The gangue is crushed by two stages to generate gangue particles with the particle size of 0.5-10 mm;
(2) Taking part of gangue particles, and further grinding the gangue particles by a ball mill to generate gangue powder;
(3) Mixing and stirring 2 parts of gangue particles, 2 parts of gangue powder, 1 part of composite excitation curing agent A material and 1 part of water to form A material gangue slurry;
(4) Mixing and stirring 2 parts of gangue particles, 2 parts of gangue powder, 1 part of composite excitation curing agent B material and 1 part of water to form B material gangue slurry;
(5) And mixing and stirring the A material gangue slurry and the B material gangue slurry in a filling area, and filling.
Example 2
In the embodiment, the formula of the composite filling material for exciting the coal gangue to solidify is as follows, wherein the water-solid ratio is 2:1+powder-solid ratio is 1:1+powder-particle ratio is 2:1: the composite material comprises the following components in parts by mass: 1 part of gangue particles, 2 parts of gangue powder, 2 parts of composite excitation curing agent A material and 4 parts of water; b, gangue slurry: 1 part of gangue particles and 2 parts of gangue particles
Gangue powder, 2 parts of composite excitation curing agent B material and 4 parts of water.
The preparation method of the composite filling material based on the excitation of the coal gangue solidification comprises the following steps:
(1) The gangue is crushed by two stages to generate gangue particles with the particle size of 0.5-10 mm;
(2) Taking part of gangue particles, and further grinding the gangue particles by a ball mill to generate gangue powder;
(3) Mixing and stirring 1 part of gangue particles, 2 parts of gangue powder, 2 parts of composite excitation curing agent A material and 4 parts of water to form A material gangue slurry;
(4) Mixing and stirring 1 part of gangue particles, 2 parts of gangue powder, 2 parts of composite excitation curing agent B and 4 parts of water to form B material gangue slurry;
(5) And mixing and stirring the A material gangue slurry and the B material gangue slurry in a filling area, and filling.
Example 3
The composite filling material for exciting the coal gangue to solidify comprises the following components in percentage by weight: the composite material comprises the following components in parts by mass: 1 part of gangue particles, 3 parts of gangue powder, 3 parts of composite excitation curing agent A material and 12 parts of water; b, gangue slurry: 1 part of gangue particles, 3 parts of gangue powder, 3 parts of composite excitation curing agent B and 12 parts of water.
The preparation method of the composite filling material based on the excitation of the coal gangue solidification comprises the following steps:
(1) The gangue is crushed by two stages to generate gangue particles with the particle size of 0.5-10 mm;
(2) Taking part of gangue particles, and further grinding the gangue particles by a ball mill to generate gangue powder;
(3) Mixing and stirring 1 part of gangue particles, 3 parts of gangue powder, 3 parts of composite excitation curing agent A material and 12 parts of water to form A material gangue slurry;
(4) Mixing and stirring 1 part of gangue particles, 3 parts of gangue powder, 3 parts of composite excitation curing agent B and 12 parts of water to form B material gangue slurry;
(5) And mixing and stirring the A material gangue slurry and the B material gangue slurry in a filling area, and filling.
Comparative example 1
The difference with example 1 is that no composite excitation curing agent A is added, and the concrete steps are as follows:
(1) The gangue is crushed by two stages to generate gangue particles with the particle size of 0.5-10 mm;
(2) Taking part of gangue particles, and further grinding the gangue particles by a ball mill to generate gangue powder;
(3) Mixing and stirring 2 parts of gangue particles, 2 parts of gangue powder and 1 part of water to form pure gangue slurry;
(4) Mixing and stirring 2 parts of gangue particles, 2 parts of gangue powder, 1 part of composite excitation curing agent B material and 1 part of water to form B material gangue slurry;
(5) Mixing and stirring pure gangue slurry and b material gangue slurry in a filling area, and filling;
comparative example 2
The difference with example 1 is that the composite excitation curing agent A is replaced by silicon dioxide, and the composite excitation curing agent B is replaced by calcium oxide, and the concrete steps are as follows:
(1) The gangue is crushed by two stages to generate gangue particles with the particle size of 0.5-10 mm;
(2) Taking part of gangue particles, and further grinding the gangue particles by a ball mill to generate gangue powder;
(3) Mixing and stirring 2 parts of gangue particles, 2 parts of gangue powder, 1 part of silicon dioxide and 1 part of water by weight to form silicon dioxide gangue slurry;
(4) Mixing and stirring 2 parts of gangue particles, 2 parts of gangue powder, 1 part of calcium oxide and 1 part of water to form calcium oxide gangue slurry;
(5) And mixing and stirring the silicon dioxide gangue slurry and the calcium oxide gangue slurry in a filling area, and filling.
The composite filling materials prepared in examples 1 to 3 and comparative examples 1 and 2 were subjected to performance test, and specific results are as follows:
(1) Example 1: the A material gangue slurry and the B material gangue slurry are not solidified after 24 hours respectively (the field diagram is shown in figure 1), the fluidity is good, the A material gangue slurry and the B material gangue slurry are mixed and rapidly undergo hydration reaction, the initial setting time is 40-60 s, no bleeding exists, and the 7d compressive strength is 10-15 MPa.
(2) Example 2: the A material gangue slurry and the B material gangue slurry are not solidified after 24 hours respectively (the field diagram is shown in figure 1), the fluidity is good, the A material gangue slurry and the B material gangue slurry are mixed and rapidly undergo hydration reaction, the initial setting time is 50-90 s, no bleeding exists, and the 7d compressive strength is 4-8 Mpa. The macroscopic photograph of the product prepared in the embodiment is shown in fig. 2 (a), the micrometer scale imaging diagram is shown in fig. 2 (b), the nanometer scale morphological diagram is shown in fig. 2 (c), and W2N in the diagram refers to a test piece with a water-solid ratio of 2:1.
(3) Example 3: the A material gangue slurry and the B material gangue slurry are not solidified after 24 hours respectively (the field diagram is shown in figure 1), the fluidity is good, the A material gangue slurry and the B material gangue slurry are mixed and rapidly undergo hydration reaction, the initial setting time is 60-120 s, no bleeding exists, and the 7d compressive strength is 1-3 Mpa.
(4) Comparative example 1: the single-slurry precipitation bleeding of the pure gangue slurry is remarkable, and the pure gangue slurry and the waste-slurry of the ethyl material are mixed and stirred, so that the stone body can not be generated without coagulation and hardening.
(5) Comparative example 2: the single slurry precipitation bleeding of the silicon dioxide gangue slurry and the calcium oxide gangue slurry is remarkable, and the stone bodies cannot be generated without coagulation and hardening after mixing and stirring.

Claims (2)

1. A composite filling material for exciting coal gangue solidification is characterized in that the raw materials of the composite filling material for exciting coal gangue solidification comprise the mass of a first material gangue slurry, a second material gangue slurry and the like, wherein the first material gangue slurry comprises gangue particles, gangue powder, a composite excitation curing agent, a first material and water, and the gangue powderThe mass ratio of the gangue powder to the composite excitation curing agent A material is (1-5) 1, and the mass ratio of the water to the composite excitation curing agent A material is (1-10) 1; the material B gangue slurry comprises gangue particles, gangue powder, composite excitation curing agent B and water, wherein the mass ratio of the gangue powder to the gangue particles is (1-5) 1, the mass ratio of the gangue powder to the composite excitation curing agent B is (1-5) 1, and the mass ratio of the water to the composite excitation curing agent B is (1-10) 1; the composite excitation curing agent A material consists of 85-95 wt.% of SiO 2 The composite excitation curing agent B consists of 90wt percent of CaO and 10wt percent of B additive, wherein the A additive is a mixture of a suspending agent, a dispersing agent and a retarder in a mass ratio of 8:1:1, the B additive is a mixture of a suspending agent, a dispersing agent and an accelerator in a mass ratio of 6:3:1, the particle size of gangue particles is 0.5-10 mm, and the fineness of gangue powder is 300-400 m of specific surface area 2 /kg。
2. The preparation method of the composite filling material for exciting the curing of the coal gangue is based on the method of claim 1, and is characterized by comprising the following steps:
weighing gangue particles, gangue powder, a composite excitation curing agent A material, a composite excitation curing agent B material and water according to the proportion of each component;
step two, preparing A/B gangue slurry, wherein the preparation scheme is any one of the following two types: (1) mixing and stirring a composite excitation curing agent A material with water, gangue powder and gangue particles to form A material gangue slurry, and mixing and stirring a composite excitation curing agent B material with water, gangue powder and gangue particles to form B material gangue slurry; (2) the ground pulping station respectively adds water into the composite excitation curing agent A/B and stirs the materials to respectively form single slurry of the materials A/B, pumps the single slurry to a filling area respectively, and then adds gangue powder and gangue particles to form gangue slurry of the materials A/B;
and thirdly, mixing and stirring the waste slurry of the first/second materials in a filling area, and filling.
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