CN115028411A - Full-grade gangue filling paste for ultra-far pumping and preparation method thereof - Google Patents
Full-grade gangue filling paste for ultra-far pumping and preparation method thereof Download PDFInfo
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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
- C04B28/04—Portland cements
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2641—Polyacrylates; Polymethacrylates
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
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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
- 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
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- 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 full-gradation coal gangue filling paste for ultra-far pumping and a preparation method thereof belong to the technical field of solid waste utilization, solve the defects of coal gangue-based mine cemented filling materials, and have the following solution: the filling paste comprises the following components in parts by weight: 80-120 parts of hydraulic cementing material, 1800-2200 parts of full-graded coal gangue, 1-10 parts of chemical excitation component, 0.1-1 part of slurry supplement component, 1-10 parts of flow maintaining component and 0.1-1 part of steady-state component; firstly, crushing the coal gangue, then dividing the coal gangue into a plurality of grading intervals, selecting a specific interval of the coal gangue to calcine, and then adding a hydraulic cementing material, a chemical excitation component, a slurry supplement component, a flow maintaining component and a component for ensuring a stable state to prepare the full-grading coal gangue filling paste capable of being pumped at an extra-long distance. The invention greatly improves the particle suspension property of the coal gangue, the homogeneity and the pumpability of the filling paste; and the full-gradation utilization of the coal gangue is realized, the cost is greatly saved, and the working performance and the curing performance of the paste are improved.
Description
Technical Field
The invention belongs to the technical field of solid waste utilization, and particularly relates to a full-grade gangue filling paste for ultra-far pumping and a preparation method thereof.
Background
The coal gangue is solid waste discharged in the coal mining and washing processes. The coal gangue has complex components, contains certain carbon and sulfur, and has obvious difference in physical and chemical properties of the coal gangue in different producing areas. Most of the coal gangue is porous and easy to absorb water, and the strength is lower. The accumulated stockpiling of coal gangue in China is over 70 hundred million tons, and the coal gangue is increased at a speed of 1.5 hundred million tons per year. The stacking of the coal gangue can cause the phenomena of spontaneous combustion, acid rain, silting of river channels, photochemical smog, debris flow and the like, so the development of a way for resource utilization of the coal gangue can have obvious environmental and social benefits.
In view of the characteristics of the coal gangue, the resource utilization needs to be considered from two aspects: 1. the waste water can be recycled after simple treatment, certain high-quality raw materials can be replaced without greatly increasing extra cost, and recycling is realized; 2. the used structure can meet the functional requirements and can solidify the toxic and harmful substances of the coal gangue, and the coal gangue does not seep out or pollute the environment. The coal gangue has a plurality of applications, such as a coal gangue base adsorption material, a coal gangue base water permeable brick, a coal gangue base wall material, a coal gangue backfill goaf and the like, wherein the coal gangue is used as a main component material to prepare a paste for filling a mine area, and the paste becomes a hotspot of research in recent years due to large usage amount, convenient construction operation and good structure functionality, and has the following main problems: firstly, the suspension property of coal gangue particles is not enough, the paste is layered, separated and not full of pipe flow, the flow loss is large during the process, and the pumping at an ultra-long distance is difficult; secondly, the paste has poor curing performance, low early strength and more internal defects; and finally, the high cost restricts the large-scale popularization of the coal gangue paste, the filling material cost accounts for more than 80% of the total cost, and the cementing material cost accounts for more than 60% of the filling material cost.
According to the patent 'preparation method of the gangue-based mine cemented filling material' (publication number: CN105152601B), the potential cementing activity of the gangue is excited by grinding, calcining and chemical excitation, part of the gangue replaces cement to serve as a cementing material of the mine cemented filling, and then the gangue with fine particle size is mixed to prepare the mine cemented filling material. The method realizes the utilization of waste coal gangue to a certain extent, but still has the following defects:
1. the coal gangue is required to be crushed to be below 5mm, and the coarse coal gangue particles above 5mm are not fully utilized;
2. grinding 0-5mm coal gangue to 200-300 meshes without distinguishing and then calcining, wherein the relation between the particle size and the chemical composition of the coal gangue and the influence of the relation on the performance of the filling paste are not analyzed;
3. 0-5mm coal gangue is used as fine aggregate without distinction, particles which obviously affect the performance of the coal gangue gypsum body are not removed and processed, and the use cost is increased.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and solve the defects of the coal gangue-based mine cemented filling material, and provides a full-graded coal gangue filling paste for ultra-far pumping, wherein the suspension property, paste homogeneity, pumpability, time-lapse flowability and curing property of coal gangue particles can meet the requirements.
In order to achieve the purpose, the design concept of the invention is as follows:
1. the ignition loss of the coal gangue is a key index related to the utilization of the coal gangue for paste recycling, most of the ignition loss components are porous media with large specific surface area and strong adsorbability, water and high-performance additives are inevitably adsorbed, and the working performance and the curing performance of the filling paste are greatly influenced. Carbon, sulfur and other organic matter components in the coal gangue are main sources of ignition loss, most of the components capable of being ignited enter a 0-0.6mm grading interval due to collision and stripping in the crushing process, and selective calcination is carried out on particles in the grading interval, so that adsorption of a porous medium can be eliminated, and the volcanic ash activity of mineral components can be increased.
2. The coal gangue particle paste filling method abandons the idea of doping the coal ash into the conventional coal gangue paste, calcines the coal gangue particles with specific particle sizes, modifies the coal gangue particles, greatly reduces the deterioration influence of the coal gangue particles on the paste performance, enhances the pozzolanic activity of the coal gangue particles, and greatly improves the workability and the curing performance of the filling paste.
In a word, in order to realize the application of the coal gangue in the filling paste, the coal gangue is firstly crushed, then divided into a plurality of grading intervals, and a specific interval is selected for calcination. The full-grade coal gangue filling paste capable of being pumped in an ultra-long distance is prepared by doping a hydraulic cementing material, full-grade coal gangue, a chemical excitation component, a slurry supplement component, a flow maintaining component and a component for ensuring a stable state.
The technical scheme adopted by the invention is as follows:
a full-grade gangue filling paste for ultra-far pumping comprises the following components in parts by weight: 80-120 parts of hydraulic cementing material, 1800-2200 parts of full-graded coal gangue, 1-10 parts of chemical excitation component, 0.1-1 part of slurry supplement component, 1-10 parts of flow maintaining component and 0.1-1 part of steady state guarantee component;
the preparation method of the full-graded coal gangue comprises the following steps:
firstly, crushing coal gangue to be less than 16 mm; then, dividing the coal gangue particles into three grading intervals of 0-0.6mm, 0.6-4.75 mm and 4.75-16 mm, and calcining the coal gangue in the grading interval of 0-0.6mm at the temperature of 650-; and finally, combining the coal gangue aggregates of each gradation into continuous gradation according to a fullerene gradation theory to prepare the full-gradation coal gangue.
Further, the hydraulic cementing material is one or two of P.O 42.5.5 type ordinary portland cement or P.C 32.5.5 type composite portland cement.
Further, the upper limit of the grade division of the minimum particle size is adjusted according to the grade interval with the maximum loss on ignition of the coal gangue.
Furthermore, the chemical excitation component is one or more of hydrated lime, anhydrite or sodium sulfate.
Further, the supplementary slurry component is one or two of dodecyl sulfate or polyacrylate super absorbent resin.
Further, the flow maintaining component is one or a plurality of sodium/calcium lignosulfonate, naphthalene sulfonic acid formaldehyde carboxyl polymer, sodium gluconate or sodium citrate.
Further, the steady state guarantee component is one or a plurality of xanthan gum, welan gum or cellulose ether.
Further, the pump-in slump, pump-in expansion, pump-in slump loss and corresponding maximum pumping distance of the full-graded coal gangue filling paste are shown in the following table 1.
TABLE 1
A preparation method of a full-grade coal gangue filling paste for ultra-far pumping comprises the following steps:
s1, crushing and screening the large coal gangue by using a jaw crusher, and dividing the screened coal gangue into three grades of 0-0.6mm, 0.6-4.75 mm and 4.75-16 mm;
s2, placing the coal gangue particles in the 0-0.6mm grading interval into an industrial furnace, heating to 700 +/-50 ℃, keeping the temperature for 2-3 hours, and then taking out and cooling for later use;
s3, mixing the 0-0.6 mm-graded coal gangue calcined in the step S2 with the 0.6-4.75 mm-16 mm-graded coal gangue calcined in the step S1 to prepare full-graded coal gangue for later use;
s4, mixing the hydraulic cementing material, the full-graded coal gangue, the chemical excitation component, the slurry supplement component, the flow maintaining component and the component ensuring the steady state according to the weight ratio, and adding water to obtain the full-graded coal gangue filling paste.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention realizes the full-gradation utilization of the coal gangue, does not use natural river sand, has more pertinence in the calcining treatment, and uses the calcined coal gangue particles as a volcanic ash material to replace the conventional fly ash, thereby greatly saving the cost and improving the working performance and the curing performance of the paste;
2. by using unconventional materials such as dodecyl sulfate, polyacrylate super absorbent resin, xanthan gum, welan gum and the like, the particle suspension property of the coal gangue and the homogeneity and pumpability of the filling paste are greatly improved.
Detailed Description
The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. Unless otherwise specified, the examples follow conventional experimental conditions. In addition, it will be apparent to those skilled in the art that various modifications or improvements can be made to the material components and amounts in these embodiments without departing from the spirit and scope of the invention as defined in the appended claims.
Example 1:
a preparation method of a full-grade gangue filling paste for ultra-far pumping comprises the following steps:
s1, crushing and screening the large coal gangue by using a jaw crusher, and dividing the screened coal gangue into three grades of 0-0.6mm, 0.6-4.75 mm and 4.75-16 mm;
s2, placing the coal gangue particles in the 0-0.6mm grading interval into an industrial furnace, heating to 700 +/-50 ℃, keeping the temperature for 2-3 hours, and then taking out and cooling for later use;
s3, mixing lime and gypsum according to the weight ratio of 2:1 preparing a chemical excitation component for later use;
s4, preparing dodecyl sulfate, Wenlun glue and polyacrylate super absorbent resin into a slurry supplementary component and a steady state guarantee component according to the weight ratio of 2:1:5 for later use;
s5, mixing calcium lignosulfonate and sodium gluconate according to a weight ratio of 2:1 preparing a flow maintaining component for later use;
s6, mixing the full-graded coal gangue prepared in the step S1 and the step S2, the chemical excitation component prepared in the step S3, the slurry supplement component and the steady state guarantee component prepared in the step S4, the flow maintaining component prepared in the step S5, water and the hydraulic cementing material P.O42.5 type cement according to the weight ratio in the table 2 to prepare the full-graded coal gangue filling paste.
Table 2 the composition and ratio (kg/m) of the filling paste of the fully graded coal gangue in example 1 3 )
| P.O42.5 cement | 100 |
| Calcined gangue (0 to 0.6mm) | 300 |
| Coal gangue (0.6 mm-4.75 mm) | 716 |
| Coal gangue (4.75 mm-16 mm) | 1068 |
| Chemically excited component | 6 |
| Steady state guaranteed component | 0.16 |
| Flow maintenance composition | 6 |
| Water (W) | 200 |
Example 2:
a preparation method of a full-grade gangue filling paste for ultra-far pumping comprises the following steps:
s1, crushing and screening the large coal gangue by using a jaw crusher, and dividing the screened coal gangue into three grades of 0-1mm, 1-4.75 mm and 4.75-16 mm;
s2, placing the coal gangue particles in the 0-1mm grading interval in an industrial furnace, heating to 700 +/-50 ℃, preserving heat for 2-3 hours, and then taking out and cooling for later use;
s3, mixing lime and gypsum according to the weight ratio of 2:1 preparing a chemical excitation component for later use;
s4, preparing dodecyl sulfate, xanthan gum and polyacrylate super absorbent tree into a slurry supplementary component and a steady state guarantee component according to the weight ratio of 2:1:5 for later use;
s5, mixing naphthalene sulfonic acid formaldehyde carboxyl polymer and sodium gluconate according to the weight ratio of 2:1 preparing a flow maintaining component for later use;
s6, mixing the full-grade coal gangue prepared in the steps S1 and S2, the chemical excitation component prepared in the step S3, the slurry supplement component and the steady-state guarantee component prepared in the step S4, the flow maintenance component prepared in the step S5, water and hydraulic cementing material P.O42.5 type cement according to the weight ratio in the table 3 to prepare the full-grade coal gangue filling paste.
Table 3 composition and ratio (kg/m) of full-grade coal gangue filling paste in example 2 3 )
| P.O42.5 cement | 100 |
| Calcined gangue (0 to 1mm) | 300 |
| Coal gangue (1 mm-4.75 mm) | 717 |
| Coal gangue (4.75 mm-16 mm) | 1069 |
| Chemically excited component | 6 |
| Steady state guaranteed composition | 0.16 |
| Flow maintenance composition | 4 |
| Water (W) | 200 |
Example 3:
a preparation method of a full-grade gangue filling paste for ultra-far pumping comprises the following steps:
s1, crushing and screening the large coal gangue by using a jaw crusher, and dividing the screened coal gangue into three grades of 0-0.6mm, 0.6-4.75 mm and 4.75-16 mm;
s2, placing the coal gangue particles in the 0-0.6mm grading interval in an industrial furnace, heating to 700 +/-50 ℃, preserving the heat for 2-3 hours, and taking out and cooling for later use;
s3, mixing lime and sodium sulfate according to the weight ratio of 2:1 preparing a chemical excitation component for later use;
s4, preparing dodecyl sulfate, cellulose ether and polyacrylate super absorbent resin into a slurry supplementary component and a steady state guarantee component according to the weight ratio of 2:1:5 for later use;
s5, mixing sodium lignosulfonate and sodium citrate according to a weight ratio of 2:1 preparing a flow maintaining component for later use;
s6, mixing the full-graded coal gangue prepared in the step S1 and the step S2, the chemical excitation component prepared in the step S3, the slurry supplement component and the steady state guarantee component prepared in the step S4, the flow maintaining component prepared in the step S5, water and the hydraulic cementing material P.O42.5 type cement according to the weight ratio in the table 4 to prepare the full-graded coal gangue filling paste.
Table 4 composition and ratio (kg/m) of full-grade coal gangue filling paste in example 3 3 )
| P.O42.5 cement | 100 |
| Calcined gangue (0 to 0.6mm) | 300 |
| Coal gangue (0.6 mm-4.75 mm) | 716 |
| Coal gangue (4.75 mm-16 mm) | 1068 |
| Chemically excited component | 6 |
| Steady state guaranteed composition | 0.16 |
| Flow maintenance composition | 6 |
| Water (W) | 200 |
Comparative example:
the conventional filling slurry (comparative example) was prepared as follows:
1) crushing the coal gangue, and respectively screening into fine coal gangue with the particle size of less than 5mm and coarse coal gangue with the particle size of 5-15 mm; the chemical components of the coal gangue are the same as those of the embodiment 1-5;
2) the raw materials were weighed according to the compositions and weight ratios shown in table 5, and cement, fly ash, fine coal gangue and coarse coal gangue were mixed first, and then water was added to mix them to prepare a filling slurry.
TABLE 5 comparative example compositions and their ratios (kg/m) 3 )
| P.O42.5 cement | 100 |
| Class II class F fly ash | 200 |
| Coal gangue (0 mm-4.75 mm) | 150 |
| Coal gangue (4.75 mm-16 mm) | 350 |
| Water (I) | 200 |
The strength properties of examples 1 to 3 and comparative examples are shown in Table 6, and the slump and spreading properties are shown in Table 7.
TABLE 6 comparison of Strength Properties of examples and comparative examples
| 3d compressive Strength (MPa) | 7d compressive Strength (MPa) | 28d compressive strength (MPa) | |
| Example 1 | 2.43 | 3.95 | 8.63 |
| Example 2 | 2.31 | 3.82 | 7.98 |
| Example 3 | 2.21 | 3.82 | 7.48 |
| Comparative example | 1.93 | 3.21 | 6.71 |
TABLE 7 comparison of working Properties of examples and comparative examples
| Slump (cm) | Extension degree (cm) | Pressure bleeding Rate (%) | |
| Example 1 | 190 | 510 | 25 |
| Example 2 | 220 | 530 | 29 |
| Example 3 | 201 | 500 | 26 |
| Comparative example | 1.93 | 520 | 35 |
As can be seen from the comparison of the test results in Table 6 and Table 7, the slump and the expansibility of the filling slurry prepared by the invention are basically kept unchanged, which shows that the slurry of the invention has no worse fluidity than the raw slurry and can be used for filling the goaf of the mine. The strength of the slurry of the invention increases in all of 3 days, 14 days and 28 days. From the working performance, the prepared paste can meet the requirement of long-distance pumping construction at the distance of 2000 m. From the view of mechanical property, the strength of the filling paste is not reduced and is slightly improved. From the actual requirement of coal mine filling, the slurry prepared by the invention can be completely used for mine filling.
The invention develops a method for selectively calcining coal gangue particles aiming at a coal mine goaf, then exciting, and finally preparing filling slurry. The workability and the compressive strength are not reduced, but the cost is reduced by more than 50%. The method provides a good solution for the treatment of the coal gangue, is beneficial to the environmental protection, and simultaneously, the safety of the mine is further enhanced because the strength of the slurry of the invention is improved by a certain compression strength compared with the original mixing ratio.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A full-grade gangue filling paste for ultra-far pumping is characterized in that: the full-grade coal gangue filling paste comprises the following components in parts by weight: 80-120 parts of hydraulic cementing material, 1800-2200 parts of full-graded coal gangue, 1-10 parts of chemical excitation component, 0.1-1 part of slurry supplement component, 1-10 parts of flow maintaining component and 0.1-1 part of steady state guarantee component;
the preparation method of the full-graded coal gangue comprises the following steps:
firstly, crushing coal gangue to be less than 16 mm; then, dividing the coal gangue particles into three grading ranges of 0-0.6mm, 0.6-4.75 mm and 4.75-16 mm, and calcining the coal gangue particles in the grading range of 0-0.6mm at the temperature of 650-; and finally, combining the coal gangue aggregates of each gradation into continuous gradation according to a fullerene gradation theory to prepare the full-gradation coal gangue.
2. The full-graded coal gangue filling paste for ultra-far pumping according to claim 1, wherein the filling paste comprises the following components in percentage by weight: the hydraulic cementing material is one or two of P.O 42.5.5 type ordinary portland cement or P.C 32.5.5 type composite portland cement.
3. The full-graded coal gangue filling paste for ultra-far pumping according to claim 1, wherein the filling paste comprises the following components in percentage by weight: and adjusting the upper limit of the grade division of the minimum primary particle size according to the grade interval with the maximum loss on ignition of the coal gangue.
4. The full-graded coal gangue filling paste for ultra-far pumping according to claim 1, wherein the filling paste comprises the following components in percentage by weight: the chemical excitation component is one or a plurality of hydrated lime, anhydrite or sodium sulfate.
5. The full-graded coal gangue filling paste for ultra-far pumping according to claim 1, wherein the filling paste comprises the following components in percentage by weight: the slurry supplementary component is one or two of dodecyl sulfate or polyacrylate super absorbent resin.
6. The full-graded coal gangue filling paste for ultra-far pumping according to claim 1, wherein the filling paste comprises the following components in percentage by weight: the flow maintaining component is one or a plurality of sodium/calcium lignosulfonate, naphthalene sulfonic acid formaldehyde carboxyl polymer, sodium gluconate or sodium citrate.
7. The full-graded coal gangue filling paste for ultra-far pumping according to claim 1, wherein the filling paste comprises the following components in percentage by weight: the steady state guarantee component is one or a plurality of xanthan gum, wen lian gum or cellulose ether.
8. The full-graded coal gangue filling paste for ultra-far pumping according to claim 1, wherein the filling paste comprises the following components in percentage by weight: the pump-in slump, pump-in expansion, pump-in slump loss and corresponding maximum pumping distance of the full-graded coal gangue filling paste are shown in the following table 1.
9. The preparation method of the full-graded coal gangue filling paste for ultra-far pumping according to claim 1, which is characterized by comprising the following steps:
s1, crushing and screening the large coal gangue by using a jaw crusher, and dividing the screened coal gangue into three grades of 0-0.6mm, 0.6-4.75 mm and 4.75-16 mm;
s2, placing the coal gangue particles in the 0-0.6mm grading interval in an industrial furnace, heating to 700 +/-50 ℃, preserving the heat for 2-3 hours, and taking out and cooling for later use;
s3, mixing the 0-0.6 mm-graded coal gangue calcined in the step S2 with the 0.6-4.75 mm-16 mm-graded coal gangue calcined in the step S1 to prepare full-graded coal gangue for later use;
s4, mixing the hydraulic cementing material, the full-graded coal gangue, the chemical excitation component, the slurry supplement component, the flow maintaining component and the steady-state ensuring component according to the weight ratio, and adding water to obtain the full-graded coal gangue filling paste.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104556885A (en) * | 2015-02-10 | 2015-04-29 | 天津城建大学 | Pumpable coal mine goaf backfilling material |
| CN105152601A (en) * | 2015-09-28 | 2015-12-16 | 太原理工大学 | Preparation method of gangue base mine cemented filling material |
| CN114560651A (en) * | 2022-03-07 | 2022-05-31 | 辽宁工程技术大学 | Coal gangue base mine filling material and preparation method thereof |
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2022
- 2022-06-13 CN CN202210667337.2A patent/CN115028411A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104556885A (en) * | 2015-02-10 | 2015-04-29 | 天津城建大学 | Pumpable coal mine goaf backfilling material |
| CN105152601A (en) * | 2015-09-28 | 2015-12-16 | 太原理工大学 | Preparation method of gangue base mine cemented filling material |
| CN114560651A (en) * | 2022-03-07 | 2022-05-31 | 辽宁工程技术大学 | Coal gangue base mine filling material and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| 陈杰 等: "基于采空区充填材料的煤矸石活化机理研究", 《太原理工大学学报》 * |
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