CN113955986A - Composite filling material for exciting coal gangue to be cured and preparation method thereof - Google Patents

Composite filling material for exciting coal gangue to be cured and preparation method thereof Download PDF

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CN113955986A
CN113955986A CN202111334599.9A CN202111334599A CN113955986A CN 113955986 A CN113955986 A CN 113955986A CN 202111334599 A CN202111334599 A CN 202111334599A CN 113955986 A CN113955986 A CN 113955986A
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gangue
slurry
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CN113955986B (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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YANGZHOU ZHONGKUANG BUILDING NEW MATERIAL TECHNOLOGY CO LTD
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    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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Abstract

A composite filling material for exciting coal gangue to solidify and a preparation method thereof are disclosed, wherein the raw materials comprise a first material gangue slurry and a second material gangue slurry and the like, wherein the first material gangue slurry comprises gangue particles, gangue powder, a composite exciting curing agent A and water; the second waste rock slurry comprises waste rock particles, waste rock powder, a composite excitation curing agent second material and water; the composite excited curing agent A is made of SiO2And the composite exciting curing agent B consists of CaO and the additive B. The invention provides a coal gangue curing agent filling material suitable for filling a goaf, wherein the curing agent and coal gangue powder cooperatively react to excite the activity of coal gangue, so that the coal gangue is fully utilized, the physical and mechanical properties of the filling material are improved, and the defects of limited pumping performance, uncontrollable condensation time and insufficient utilization of coal gangue of the traditional coal gangue filling material are overcome.

Description

Composite filling material for exciting coal gangue to be cured 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 solidification of coal gangue and a preparation method thereof.
Background
The coal gangue is a rock which has lower carbon content and is harder than coal and is mixed in a coal bed, and is a general term of solid waste discharged in the coal mining and coal washing processes. As a coal mining country, the emission of coal gangue in China accounts for about 10% of the coal yield in the same year, and the emission is huge. The discharged large amount of coal gangue not only occupies a large amount of land and farmland, but also pollutes the environment. The emission reduction of the coal gangue and the realization of harmless and recycling treatment of the coal gangue are imperative. Wherein, combine together gangue and cementitious material, it is the important direction of gangue innoxious and resourceful treatment to be applied to the engineering field:
(1) the gangue is applied to cement-based materials, and is mainly used as a mixture, an admixture, an aggregate and the like to prepare gangue composite cement, and a concrete material is prepared and comprises gangue-fly ash foamed concrete, cement-stabilized gangue mixture for roads, heat-preservation concrete, pervious concrete, aerated concrete, mixed mortar and the like, or the gangue is used as a raw material to replace a clay ingredient to produce cement clinker. The utilization mode of the coal gangue has insufficient excitation on the activity of the coal gangue, the utilization rate of the coal gangue is low, the application scene is limited by material performance and indexes, and the application amount is limited, so that the resource utilization amount of the coal gangue is reduced.
(2) The gangue is added with cementing materials such as cement and the like to prepare paste-shaped thick materials as filling materials for filling the coal mine goaf. The coal gangue paste filling mainly faces the problems of insufficient pumpability and stability. Wherein, the pumpability is closely related to the physical characteristics of the density, the size fraction composition, the particle shape and the like of the mixed material. The water consumption is small, the material density is high, the pumping resistance is large, the pipeline is easy to block, the manual cleaning is consumed, and the construction period is delayed. When the water consumption is large, the coagulation time is long and the strength is low. Meanwhile, the filling of the gangue paste also has the defects of large cement consumption, high cost and low utilization rate of gangue.
The goaf is filled with coal gangue, is an important component of the current green mining of coal mines, and can achieve the following purposes: the method has the advantages that the stacking of the waste rock hills is reduced, the solid waste pollution is reduced, and the economic burden brought by the environment management of the waste rock hills and the occupied land purchase cost is reduced; secondly, the environmental problem caused by the problems of ground settlement and collapse is reduced; and the effect of retaining the lane in the two lanes is ensured, the cost of retaining the lane is reduced, and the coal extraction rate is improved. The coal gangue is used for filling the goaf, the use amount of the coal 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 problem to be solved is as follows: aiming at the problems in the prior art, the invention provides a composite filling material for activating coal gangue curing and a preparation method thereof, and provides a coal gangue curing agent filling material suitable for filling a goaf.
The technical scheme is as follows: the composite filling material for exciting the curing of the coal gangue comprises raw materials such as a first material gangue slurry and a second material gangue slurry, wherein the first material gangue slurry comprises gangue particles, gangue powder, a first composite excitation curing agent and water, the mass ratio of the gangue powder to the gangue particles is (1-5): 1, the mass ratio of the gangue powder to the first composite excitation curing agent is (1-5): 1, and the mass ratio of the water to the first composite excitation curing agent is (1-10): 1; the second-material gangue slurry comprises gangue particles, gangue powder, a composite excitation curing agent second material 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 second material is (1-5): 1, and the mass ratio of the water to the composite excitation curing agent second material is (1-10): 1; the composite excitation curing agent A material is prepared from 85-95 wt.% of SiO2And 5-15. wt.% of a material A additive, wherein the material B of the composite excitation curing agent consists of 90 wt.% of CaO and 10 wt.% of a material B additive.
Preferably, the particle size of the gangue particles is 0.5-10 mm. The gangue is crushed into gangue particles in two stages, and the gangue particles with fine particle size are used as aggregate in the filling material, so that the mechanical property of a consolidation 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 area2In terms of/kg. The gangue powder is formed by gangue particles through ball mill grinding, and the ball mill grinding process can be dry grinding to form pure gangue powder or wet grinding to form gangue powder slurry. The grinding is one of the modes for realizing physical excitation of the coal gangue, and the hydration and condensation activity of the ground coal gangue powder is improved. The gangue powder has three functions in the filling material of the invention: under double excitation of grinding physical excitation and additive chemical excitation, the hydration and condensation activity of the gangue powder is further improved, the gangue powder has hydration reaction with water, and the setting and hardening performance and the mechanical performance of the filling material are improved; secondly, the part which does not generate hydration reaction is used as a stable solid matrix to be filled in the pores of the consolidation body, so that the mechanical property of the consolidation body is improved, and the utilization rate of the coal gangue is increased; and thirdly, adding water into the gangue powder to form gangue powder slurry serving as a pumping carrier of the gangue particles (the gangue particles are more easily suspended in the gangue powder slurry and are further convenient to pump due to higher density than pure water).
Preferably, the material A additive is a mixture of a suspending agent, a dispersing agent and a retarder in a mass ratio of 8:1:1, and the material B 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 curing of the coal gangue 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;
preparing the first/second material gangue slurry, wherein the preparation scheme is any one of the following three types: firstly, mixing and stirring all components of the first-material gangue slurry and the second-material gangue slurry at a ground pulping station to form first-material gangue slurry and second-material gangue slurry, and respectively pumping the first-material gangue slurry and the second-material gangue slurry to a filling area; secondly, mixing and stirring a first compound excitation curing agent material with water, gangue powder and gangue particles to form a first material gangue slurry, and mixing and stirring a second compound excitation curing agent material with water, gangue powder and gangue particles to form a second material gangue slurry; thirdly, the ground pulping station respectively adds water into the composite excitation curing agent A/B and stirs the mixture to form A/B material single slurry respectively, the slurry is respectively pumped to a filling area, and then gangue powder and gangue particles are added to form A/B material gangue slurry;
and step three, filling after mixing and stirring the first/second-material waste rock slurry in a filling area, wherein hydration reaction occurs between the three components and water, and the three components are quickly condensed and hardened to form a filling consolidation body (the first/second-material waste rock slurry can be not solidified for 24 hours, and sufficient time can be ensured for realizing pumping and storage).
The setting and hardening reaction in the step three mainly comprises the processes of hydration dissolution, gelling solidification, strength hardening and the like, and four different hydration reactions (C ═ CaO, S ═ SiO) exist2，A＝Al2O3，
Figure BDA0003350137650000035
H＝H2O)：
①
Figure BDA0003350137650000031
②
Figure BDA0003350137650000034
③2CS+2H→C-S-H+CH；
④
Figure BDA0003350137650000033
(AH) in the above hydration product3) Can be further combined with (CH) and
Figure BDA0003350137650000036
reaction to produce ettringite
Figure BDA0003350137650000037
Figure BDA0003350137650000038
AFt for short), Calcium Silicate Hydrate gel (Calcium Silicate Hydrate, C-S-H for short) and
Figure BDA0003350137650000039
the hydrated calcium aluminosilicate gel (C-A-S-H) is formed by combination. The main component of the coal gangue is Al2O3、SiO2、Fe2O3The content of the active carbon accounts for more than 80 percent of the total content, and the active carbon also comprises CaO, MgO and Na with different quantities2O、K2O、P2O5And the like. The high alkaline compounds such as calcium hydroxide generated by the hydration reaction can further stimulate the hydration coagulation activity of the gangue powder and CaO and SiO2、Ca(OH)2Hydration to generate ettringite, active silicon and Ca (OH)2A secondary C-S-H gel is formed.
The solid substance generated by the composite filling material through the hydration reaction mainly comprises: ettringite (AFt), alumina gel (AH)3) Calcium silicate hydrate gel (C-S-H) and C-A-S-H gel. The ettringite accounts for the largest proportion, the branched and columnar ettringite crystals are interwoven and connected to form a space network structure, other hydration products of alumina gel, hydrated calcium silicate gel and the like are filled among the interwoven ettringite crystals to present a porous characteristic, and gangue particles and gangue powder which do not participate in the hydration products are filled in the pores of the generated consolidation body to increase the compactness of the consolidation body. The macroscopic photograph, the micron scale imaging (three-dimensional X-ray microscopic imaging) and the nanometer scale morphology (scanning electron microscope) of the consolidated body prepared from the composite filling material according to the patent are shown in figure 2.
Has the advantages that: compared with other related materials and technologies, the filling material has the following innovation points and advantages:
1) the coal 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 of the invention: firstly, from the perspective of raw material cost, the coal gangue is sufficient and convenient in source; from the angle of the coal gangue usage, the coal gangue occupancy 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 increased; from the aspect of the quality of coal gangue utilization, the coal gangue comprehensive utilization device can realize physical and chemical double excitation on the coal gangue, fully excite the hydration and condensation activity, promote the coal gangue to participate in the hydration and condensation reaction, and meanwhile, the coal gangue is also used as a filling aggregate, a conveying carrier, a suspension carrier and other aspects, so that the utilization efficiency of the coal gangue is improved, and the full excavation of the performance of the coal gangue is realized.
2) The combined filling material comprises the following components: the fine-particle-size gangue particles, the gangue powder slurry and the gangue powder curing agent slurry can be matched with a conveying system, long-distance conveying is achieved, the pumping system is less constrained by environmental conditions and is flexible in arrangement, 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 difference requirements of filling spaces on parameters such as strength, condensation time, pumping distance, arrangement of slurry stop walls and the like under different working conditions by adjusting the proportion of gangue particles, gangue powder and an exciting and curing complexing agent, and realizes adjustable and controllable filling parameters and strong working condition adaptability.
Drawings
FIG. 1 is a field diagram of single slurry non-coagulation of the first/second gangue slurry (the field diagrams of the first gangue slurry and the second gangue slurry are the same);
FIG. 2 is a macroscopic photograph, a micro-scale image (three-dimensional X-ray microscopic image) and a nano-scale morphology (scanning electron microscope) of a consolidated body of the composite filling material according to example 2 of the present invention, in which (a) is a macroscopic photograph of the consolidated body of the composite filling material; (b) imaging the composite filling material on a micrometer scale; (c) is a nano-scale morphology map of the composite filling material.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific embodiments.
In the embodiment of the specification, the gangue particles are formed by two-stage crushing of gangue, and the particle size is 0.5-10 mm. The fine-particle-size gangue particles are used as aggregates 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 pulverizing gangue particles through a ball mill, and the fineness of the gangue powder is controlled to be about 300-400 m in specific surface area2In terms of/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. The grinding is one of the ways of realizing physical excitation of the coal gangue, and the pulverized coal gangue powder is hydrated and condensedThe activity is improved. The gangue powder has three functions in the filling material of the invention: under double excitation of grinding physical excitation and additive chemical excitation, the hydration and condensation activity of the gangue powder is further improved, the gangue powder has hydration reaction with water, and the setting and hardening performance and the mechanical performance of the filling material are improved; secondly, the part which does not generate hydration reaction is used as a stable solid matrix to be filled in the pores of the consolidation body, so that the mechanical property of the consolidation body is improved, and the utilization rate of the coal gangue is increased; and thirdly, adding water into the gangue powder to form gangue powder slurry serving as a pumping carrier of the gangue particles (the gangue particles are more easily suspended in the gangue powder slurry and are further convenient to pump due to higher density than pure water).
The composite excited curing agent A is made of SiO2(85-95 wt.%) and additive A (5-15 wt.%), and additive B (90 wt.%) and additive B (10 wt.%). The additive A is a BX type JT1 additive (a mixture of a suspending agent, a dispersing agent and a retarder in a mass ratio of 8:1: 1) from New York building New Material science and technology Limited company of Yangzhou Zhongshi, and the additive B 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) from New York building Material science and technology Limited company of Yangzhou.
The functions of the composite excitation curing agent mainly comprise: firstly, mixing a composite excitation curing agent A material and a composite excitation curing agent B material, then carrying out hydration reaction with water, condensing and hardening to form a solidified body and having certain strength; ② the SiO contained in the composite exciting curing agent A/B material2And alkaline compounds generated by the reaction of CaO and hydration promote the gangue powder to generate chemical excitation, the chemical excitation is one of the most effective excitation ways of the gangue, and the hydration and condensation activity of the gangue powder can be further improved. The composite excitation curing agent A material and the composite excitation curing agent B material have the following characteristics: high water-cement ratio: the curing agent can realize effective condensation and curing under the condition of high water-to-solid ratio (the weight ratio of the curing agent to water is 1: 1-1: 10) and generate strength, so that the cost can be greatly saved and the pumping capacity can be effectively improved; ② single slurry non-coagulation: the composite exciting curing agent A and the composite exciting curing agent B are separately added with water and stirred to form single slurry of the material A and single slurry of the material B which can not react for 24 hours, so the filling material of the inventionHas abundant pumping time and storage time, and is convenient for flexible allocation of subsequent procedures. ③ quick setting after mixing: when the first single slurry and the second single slurry are mixed, the mixture can be quickly solidified and hardened and has certain strength, the filling effect is quickly realized, the time is saved, and the project progress is accelerated.
The three components can adapt to the specific filling condition and the filling requirement (such as material conveying distance, filling consolidation body 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 according to the weight sequence: firstly, water-solid ratio; ② powder-solid ratio; ③ powder particle ratio; fourthly, the particle size of the gangue particles. The summary of the index range and the performance rule is as follows:
(1) water-solid ratio: the weight ratio of water to the composite exciting curing agent is usually 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 higher the strength of the generated solidified body are, but the larger the additive dosage is, the higher the cost is;
(2) powder-solid ratio: the weight ratio of the gangue powder to the composite excitation curing agent is usually 1: 1-5: 1, the powder-solid ratio mainly balances pumping performance, utilization rate of the gangue and chemical excitation efficiency of the gangue, and the powder-solid ratio can be larger when the water-solid ratio is larger;
(3) powder particle ratio: the ratio of the gangue powder to the gangue particles is usually 1: 1-5: 1, and the utilization rate of the gangue and the compactness of a solidified body are mainly balanced;
(4) the particle size of the gangue particles is as follows: generally, the particle size is smaller, the pumping capacity requirement is smaller, but the crushing cost is higher, when the particle size is smaller, the balance between the pumping capacity and the crushing cost is matched with the conveying conditions (such as pumping pressure, pipeline diameter and conveying distance). In addition, according to the condition of the transportation equipment, the size of the gangue particles can be not limited by the pumping equipment if the gangue particles are transported to the filling area by the belt type transportation equipment.
Example 1
In the embodiment, the composite filling material for activating the coal gangue to cure has a water-solid ratio of 1:1+ powder-solid ratio of 2:1+ powder-particle ratio of 1:1, and has the following formula: the composite material consists of a first material gangue slurry, a second material gangue slurry and the like in parts by mass, wherein the first material gangue slurry 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 particles
Gangue powder, 1 part of composite exciting curing agent B material and 1 part of water.
The preparation method of the composite filling material based on the excited coal gangue curing comprises the following steps:
(1) the coal gangue is crushed in 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 compound excitation curing agent B and 1 part of water to form B material gangue slurry;
(5) and mixing and stirring the first gangue slurry and the second gangue slurry in a filling area, and filling.
Example 2
In the embodiment, the composite filling material for activating the coal gangue to cure has a water-solid ratio of 2:1+ powder-solid ratio of 1:1+ powder-particle ratio of 2:1, and the formula is as follows: the composite material consists of a first material gangue slurry, a second material gangue slurry and the like in parts by mass, wherein the first material gangue slurry 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 exciting curing agent B material and 4 parts of water.
The preparation method of the composite filling material based on the excited coal gangue curing comprises the following steps:
(1) the coal gangue is crushed in 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 compound excitation curing agent B and 4 parts of water to form B material gangue slurry;
(5) and mixing and stirring the first gangue slurry and the second gangue slurry in a filling area, and filling.
Example 3
In the composite filling material for activating the coal gangue to cure, the water-solid ratio is 4:1+ the powder-solid ratio is 1:1+ the powder-particle ratio is 3:1, and the formula is as follows: the composite material consists of a first material gangue slurry, a second material gangue slurry and the like in parts by mass, wherein the first material gangue slurry 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 material and 12 parts of water.
The preparation method of the composite filling material based on the excited coal gangue curing comprises the following steps:
(1) the coal gangue is crushed in 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 compound excitation curing agent B and 12 parts of water to form B material gangue slurry;
(5) and mixing and stirring the first gangue slurry and the second gangue slurry in a filling area, and filling.
Comparative example 1
The difference from example 1 is that the composite excitation curing agent A material is not added, and the concrete is as follows:
(1) the coal gangue is crushed in 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 compound excitation curing agent B and 1 part of water to form B material gangue slurry;
(5) mixing and stirring pure gangue slurry and second gangue slurry in a filling area, and filling;
comparative example 2
The difference from 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, specifically as follows:
(1) the coal gangue is crushed in 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 waste rock slurry and the calcium oxide waste rock 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 tests, and the specific results were as follows:
(1) example 1: the first-material gangue slurry and the second-material gangue slurry are not solidified for 24 hours respectively (see a field diagram in figure 1), the flowability is good, the first-material gangue slurry and the second-material gangue slurry are mixed to quickly generate hydration reaction, the initial setting time is 40-60 s, no bleeding exists, and the 7-day compressive strength is 10-15 MPa.
(2) Example 2: the first-material gangue slurry and the second-material gangue slurry are not solidified for 24 hours respectively (see a field diagram in figure 1), the flowability is good, the first-material gangue slurry and the second-material gangue slurry are mixed to quickly generate hydration reaction, the initial setting time is 50-90 s, no bleeding exists, and the 7-day compressive strength is 4-8 Mpa. The macro photograph of the product prepared in this example is shown in fig. 2(a), the micro-scale imaging graph is shown in fig. 2(b), the nano-scale morphology graph is shown in fig. 2(c), and in the graph, W2N indicates a test piece with a water-solid ratio of 2: 1.
(3) Example 3: the first-material gangue slurry and the second-material gangue slurry are not solidified for 24 hours respectively (see a field diagram 1), the flowability is good, the first-material gangue slurry and the second-material gangue slurry are mixed to quickly generate 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 pure gangue slurry single-slurry precipitation bleeding is obvious, and the pure gangue slurry and the second gangue slurry are mixed and stirred without being coagulated and hardened, so that a concretion body cannot be generated.
(5) Comparative example 2: the silicon dioxide waste rock slurry and the calcium oxide waste rock slurry have obvious single-slurry precipitation bleeding, are mixed and stirred, are not coagulated and hardened, and can not generate a concretion body.

Claims (5)

1. The composite filling material for exciting the curing of the coal gangue is characterized in that the raw material of the composite filling material for exciting the curing of the coal gangue consists of a first material gangue slurry and a second material gangue slurry in mass, wherein the first material gangue slurry comprises gangue particles, gangue powder, a composite exciting curing agent A and water, 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 exciting curing agent A is (1-5): 1, and the mass ratio of the water to the composite exciting curing agent A is (1-10): 1; the second-material gangue slurry comprises gangue particles, gangue powder, a composite excitation curing agent second material 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 second material is (1-5): 1, and the mass ratio of the water to the composite excitation curing agent second material is (1-10): 1; the composite excitation curing agent A material is prepared from 85-95 wt.% of SiO2And 5-15 wt.% of a material A additive, wherein the material B of the composite excitation curing agent consists of 90 wt.% of CaO and 10 wt.% of a material B additive.
2. The composite filling material for activating the curing of the coal gangue as claimed in claim 1, wherein the particle size of the gangue particles is 0.5-10 mm.
3. The composite filling material for activating the curing of the coal gangue as claimed in claim 1, wherein the fineness of the coal gangue powder is 300-400 m of specific surface area2/kg。
4. The composite filling material for activating the curing of the coal gangue as claimed in claim 1, wherein the material A additive is a mixture of a suspending agent, a dispersing agent and a retarder in a mass ratio of 8:1:1, and the material B additive is a mixture of a suspending agent, a dispersing agent and an accelerator in a mass ratio of 6:3: 1.
5. The preparation method of the composite filling material for activating the coal gangue to cure according to claim 1 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;
preparing the first/second material gangue slurry, wherein the preparation scheme is any one of the following three types: firstly, mixing and stirring all components of the first-material gangue slurry and the second-material gangue slurry at a ground pulping station to form first-material gangue slurry and second-material gangue slurry, and respectively pumping the first-material gangue slurry and the second-material gangue slurry to a filling area; secondly, mixing and stirring a first compound excitation curing agent material with water, gangue powder and gangue particles to form a first material gangue slurry, and mixing and stirring a second compound excitation curing agent material with water, gangue powder and gangue particles to form a second material gangue slurry; thirdly, the ground pulping station respectively adds water into the composite excitation curing agent A/B and stirs the mixture to form A/B material single slurry respectively, the slurry is respectively pumped to a filling area, and then gangue powder and gangue particles are added to form A/B material gangue slurry;
and step three, mixing and stirring the A/B waste rock slurry in a filling area, and filling, wherein hydration reaction occurs between the three components and water, and the three components are quickly coagulated and hardened to form a filling solidification body.
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CN114685136A (en) * 2022-03-30 2022-07-01 河北充填采矿技术有限公司 Sprayable filling material, filling method thereof and filling system
CN118084448A (en) * 2024-04-18 2024-05-28 太原科技大学 Gangue high-concentration filling slurry and preparation method thereof

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CN101628791A (en) * 2009-06-25 2010-01-20 深圳航天科技创新研究院 Geopolymer gel material for rush repairs and rush constructions

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114685136A (en) * 2022-03-30 2022-07-01 河北充填采矿技术有限公司 Sprayable filling material, filling method thereof and filling system
CN118084448A (en) * 2024-04-18 2024-05-28 太原科技大学 Gangue high-concentration filling slurry and preparation method thereof

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