CN114349405A - Composition for preparing filling material, preparation method of filling material and method for filling mine - Google Patents
Composition for preparing filling material, preparation method of filling material and method for filling mine Download PDFInfo
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- CN114349405A CN114349405A CN202210043107.9A CN202210043107A CN114349405A CN 114349405 A CN114349405 A CN 114349405A CN 202210043107 A CN202210043107 A CN 202210043107A CN 114349405 A CN114349405 A CN 114349405A
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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
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Abstract
The application relates to the technical field of industrial solid waste treatment, in particular to a composition for preparing a filling material, a preparation method of the filling material and a method for filling a mine. The composition for preparing the filling material comprises aggregate, a cementing material and an admixture; the aggregate comprises coal gangue; the cementing material comprises cement, gasified slag and fly ash; the admixture comprises a first admixture and a second admixture; the first admixture comprises a polycarboxylic acid water reducing agent; the second additive comprises any one of a calcium lignosulfonate water reducing agent, dispersible latex powder and an organic early strength agent. The coal gangue is used as the aggregate of the filling material, the cement is used as a chemical activator to improve the cementing property of the fly ash and the gasified slag, and the first additive and the second additive are used for improving the pumping effect of the filling material during pumping and improving the compressive strength of the filling material after solidification.
Description
Technical Field
The application relates to the technical field of industrial solid waste treatment, in particular to a composition for preparing a filling material, a preparation method of the filling material and a method for filling a mine.
Background
The coal gangue is coal-based solid waste generated in the coal mining process, and the coal gangue yield accounts for 10-25% of the total amount of the coal mining ore. Coal gangue can cause serious pollution to the environment, however, the resource utilization of coal-based solid waste such as coal gangue is an important way for solving the problem.
At present, the main fields of coal gangue consumption are the fields of power generation, road building, chemical engineering and the like. But the annual utilization rate of the coal gangue is only about 60 percent. The existing research shows that the low-cost filling material is feasible by mainly adopting the coal-based solid waste, and the exploitation of natural resources can be reduced, the emission of the coal-based solid waste can be reduced, and the ecological environment can be improved by recycling the coal-based solid waste.
However, the existing filling material manufactured by adopting coal-based solid wastes is usually prepared by sintering and other steps, so that the pollution and energy consumption are large, and meanwhile, the compressive strength and the pumping performance are not good, and the requirement of construction on the filling material cannot be met.
Disclosure of Invention
An object of embodiments of the present application is to provide a composition for preparing a filling material, a method for preparing a filling material, and a method for filling a mine, which aim to improve the problems of poor compressive strength and pumping performance of existing filling materials prepared using coal-based solid wastes.
The first aspect of the present application provides a composition for preparing a filling material, comprising an aggregate, a cementitious material and an admixture.
The aggregate comprises coal gangue.
The cementing material comprises cement, gasified slag and fly ash.
The admixture comprises a first admixture and a second admixture; the first admixture comprises a polycarboxylic acid water reducing agent; the second additive comprises any one of a calcium lignosulfonate water reducing agent, dispersible latex powder and an organic early strength agent.
The coal gangue serves as aggregate, the cement, the gasified slag and the fly ash serve as cementing materials, and the admixture serves as a composition for preparing the filling material. The coal gangue serving as the aggregate of the filling material not only can provide the basic strength of the filling material, but also can reduce the volume change caused by the setting and hardening processes of the cementing material. The cement is used as a chemical activator to improve the cementing property of the fly ash and the gasified slag, and a sintering step is not needed, so that the cement is pollution-free and has low energy consumption. The first additive comprises a polycarboxylic acid water reducing agent, so that the compressive strength of the filling material after solidification can be improved; the second additive comprises any one of a calcium lignosulfonate water reducing agent, dispersible latex powder and an organic early strength agent, and can make up the defects of mud content sensitivity and high viscosity of the polycarboxylic acid water reducing agent; when the composition for preparing the filling material and water are used for preparing the filling material, the first additive and the second additive are used for improving the pumping effect of the filling material during pumping and improving the compressive strength of the filling material after solidification in a synergistic manner so as to meet the requirements of construction on the filling material, and the composition is low in cost and simple to operate.
In a second aspect, the present application provides a method for preparing a filling material, comprising preparing a filling material using water and the composition for preparing a filling material provided in the first aspect.
Mixing and stirring the admixture, the cementing material and water, adding the aggregate, mixing and stirring.
The admixture, the cementing material and the water are mixed and stirred firstly, and then the aggregate is added, so that the aggregate can be prevented from absorbing a large amount of water, the cementing material can fully absorb the water to well perform a hydration process, and the fluidity of the filling material during pump injection is improved; the filling material obtained by the preparation method has a better pump injection effect during pump injection, and has better compressive strength after solidification.
In a third aspect of the present invention, there is provided a method of filling a mine, comprising feeding a filling material prepared by the method of the second aspect into the mine to perform a filling operation.
The filling material prepared by the preparation method provided by the second aspect is sent to a mine for filling operation, and the filling material has a good pumping effect during pumping and has good compressive strength after solidification, so that the requirement of mine filling construction on the filling material can be met.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following provides a detailed description of a composition for preparing a filling material, a method for preparing a filling material, and a method for filling a mine.
The filling material of the present application is used for filling a mine or a locally collapsed fracture or the like.
The application provides a composition for preparing a filling material, which comprises aggregate, a cementing material and an admixture. The aggregate comprises coal gangue. The cementing material comprises cement, gasified slag and fly ash. The admixture comprises a first admixture and a second admixture. The first admixture comprises a polycarboxylic acid water reducing agent; the second additive comprises any one of a calcium lignosulfonate water reducing agent, dispersible latex powder and an organic early strength agent.
The coal gangue serves as the aggregate of the filling material, so that the basic strength of the filling material can be improved, and the filling material has a certain bearing capacity; the volume change caused by the cement material in the setting and hardening process can be reduced. Meanwhile, the coal gangue serves as coal-based solid waste with great environmental pollution, and the coal gangue serves as aggregate, so that the emission of the coal-based solid waste can be reduced, and the ecological environment can be improved.
The cement serving as a chemical activator can improve the cementing activity of the fly ash and the gasified slag, so that a high-polymerization-state gel with a three-dimensional network structure, namely a silicon-aluminum-based geopolymer cementing system, is formed, and the coal gangue aggregates are well bonded together; the cementing activity is obtained without a sintering step, and the method is pollution-free and low in energy consumption. Meanwhile, the gasified slag and the fly ash are both the coal-electricity solid waste, so that the high-efficiency utilization of the coal-electricity solid waste resources can be realized.
The inventor researches and discovers that the compressive strength of the filling material after being cured can be remarkably improved by adding the first additive into the composition for preparing the filling material, wherein the first additive comprises a polycarboxylic acid water reducing agent. However, the polycarboxylate superplasticizer is particularly sensitive to mud content, so that the result of poor fluidity is caused; meanwhile, the filling material added with the polycarboxylate superplasticizer still has the defect of high viscosity, so that the filling material has low fluidity and poor pumping effect, and the requirement of construction on the filling material cannot be met.
The inventor accidentally finds that the second additive and the first additive are compounded to serve as the additive in an experiment, the second additive comprises any one of a calcium lignosulfonate water reducing agent, dispersible latex powder and an organic early strength agent, and the defects of mud content sensitivity and high viscosity of a polycarboxylic acid water reducing agent can be overcome; when the composition for preparing the filling material and the water are used for preparing the filling material, the second additive can improve the pumping effect of the filling material during pumping, and meanwhile, the compression strength of the filling material after solidification is further improved by the cooperation of the first additive and the second additive so as to meet the requirements of construction on the filling material, and the composition is low in cost and simple to operate.
In this example, the mass ratio of the aggregate, the cementitious material and the admixture in the composition for preparing the filling material was (30-60): (25-59): (0.03-1).
As an example, the mass ratio of the aggregate, the cementitious material, and the admixture in the composition for preparing the filling material may be 30: 59: 1 and 44.95: 42: 0.05, and so on.
Under the proportion, the filling material has the effects of good pumpability and good condensation strength. If the proportion of the aggregate is too much, the compressive strength after later curing is not ideal.
Further, the mass ratio of the aggregate, the cementing material and the admixture in the composition for preparing the filling material is 44.95: 42: 0.05, the pumping effect of the filling material during pumping can be further improved, and the compressive strength of the filling material after solidification can be further improved.
When coal refuse is used as an aggregate for a fill material (e.g., a mine fill material), its particle size distribution is an important factor affecting the performance of the fill material. Because the coal gangue raw material is generally blocky and has larger grain diameter, the coal gangue can not be used as a filling material, and therefore, the coal gangue needs to be crushed.
In the embodiment, the grain diameter of the coal gangue is less than or equal to 7.00 mm; furthermore, the grain diameter of the coal gangue is less than or equal to 4.75 mm; furthermore, the grain diameter of the coal gangue is less than or equal to 4.00 mm; if the particle size of the coal gangue is too large, cement cannot be adhered to the surface of the coal gangue, so that the filling material after final curing can be seriously segregated, aggregates cannot be adhered together, and the requirement of construction on the compressive strength of the filling material cannot be met.
As mentioned above, the cementing material comprises cement, gasified slag and fly ash. In this example, the cement comprises the following components in mass percent:
10-40% of cement, 1-30% of gasified slag and 30-89% of fly ash.
Under the proportion, the cement serving as a chemical activator can well chemically excite the cementing activity of the fly ash and the gasified slag to form high-aggregation-state gel with a three-dimensional network structure, so that aggregates are connected together, and the compressive strength of the filling material is improved. If the proportion of the cement is too low, the compressive strength of the prepared filling material after curing is not ideal.
As an example, the mass percentage of cement in the cement may be 10%, 15%, 30%, 40%, etc.; the mass percentage of the gasified slag in the cementing material can be 1%, 5%, 20%, 30% and the like; the mass percentage of the fly ash in the cementing material can be 30%, 40%, 50%, 70%, 89% and the like.
Further, in some embodiments of the present application, the mass ratio of the cement, the gasified slag, and the fly ash is 1: 1: 6.5. the cementing property of the cementing material is optimal under the proportion.
In some embodiments, the gasified slag is subjected to particle size screening, the particle size of the gasified slag is intensively distributed in the range of 1.18-4.75mm, and the gasified slag can have an active admixture effect.
As mentioned above, the second additive comprises any one of a calcium lignosulfonate water reducing agent, dispersible latex powder and an organic early strength agent. The organic early strength agent can be selected from triethanolamine, calcium formate, urea and the like.
In this embodiment, when the second additive is selected from the calcium lignosulfonate water-reducing agents, the additive comprises 40-70% by mass of the first additive (polycarboxylic acid water-reducing agent) and 30-60% by mass of the second additive (calcium lignosulfonate water-reducing agent). If the proportion of the polycarboxylic acid water reducing agent is low and the proportion of the calcium lignosulfonate water reducing agent is too high, the prepared filling material has poor fluidity and cannot be pumped.
Illustratively, the mass percentage of the polycarboxylic acid water reducing agent in the additive can be 40%, 45%, 50%, 65% and 70% and the like; the mass percentage of the calcium lignosulfonate water reducing agent in the additive can be 30%, 35%, 50%, 55% and 60% and the like. When the additive is selected from the substances and the mixture ratio, the pumping effect of the filling material during pumping can be improved, and the compressive strength of the filling material after solidification can be improved, so that the requirement of construction on the filling material can be met.
Further, in some embodiments herein, when the second admixture is selected from calcium lignosulfonate water reducing agents, the mass ratio of the first admixture to the second admixture is 1: 1, the pumping effect of the filling material during pumping can be further improved, and the compressive strength of the filling material after solidification can be further improved.
In this embodiment, when the second additive includes dispersible latex powder, the additive includes 50 to 80% by mass of the first additive (polycarboxylic acid water reducing agent) and 20 to 50% by mass of the second additive (dispersible latex powder). If the proportion of the polycarboxylic acid water reducing agent is low and the proportion of the dispersible latex powder is low, the prepared filling material has poor fluidity and cannot be pumped.
Illustratively, the mass percentage of the polycarboxylic acid water reducing agent in the additive can be 50%, 55%, 65% and 80%, and the like; the dispersible latex powder can be 20%, 35%, 45%, 50% and the like in percentage by mass in the additive. When the additive is selected from the substances and the mixture ratio, the pumping effect of the filling material during pumping can be improved, and the compressive strength of the filling material after solidification can be improved, so that the requirement of construction on the filling material can be met.
Further, in some embodiments of the present application, when the second additive is selected from the dispersible latex powder, the mass ratio of the first additive to the second additive is 2: 1, the pumping effect of the filling material during pumping can be further improved, and the compressive strength of the filling material after solidification can be further improved.
In this embodiment, when the second admixture includes the organic early strength agent, the admixture includes 2 to 10 mass% of the first admixture (polycarboxylic acid water reducing agent) and 90 to 98 mass% of the second admixture (organic early strength agent). If the proportion of the polycarboxylic acid water reducing agent exceeds 10%, bleeding is easy to occur.
Illustratively, the mass percentage of the polycarboxylic acid water reducing agent in the additive can be 2%, 5%, 7%, 10% and the like; the mass percentage of the organic early strength agent in the additive can be 90%, 93%, 95% and 98%, etc. When the additive is selected from the substances and the mixture ratio, the pumping effect of the filling material during pumping can be improved, and the compressive strength of the filling material after solidification can be improved, so that the requirement of construction on the filling material can be met.
Further, in some embodiments herein, when the second admixture is selected from the group consisting of organic early strength agents, the mass ratio of the first admixture to the second admixture is 10: 1, the pumping effect of the filling material during pumping can be further improved, and the compressive strength of the filling material after solidification can be further improved.
The composition for preparing the filling material provided by the application has at least the following advantages:
the method selects coal-based coal gangue, coal-electricity solidified waste gas slag and fly ash, and is matched with cement; the additive is prepared by compounding a first additive (comprising a polycarboxylic acid water reducing agent) and a second additive (comprising any one of a calcium lignosulfonate water reducing agent, dispersible latex powder and an organic early strength agent). The coal gangue is used as the aggregate of the filling material, cement can chemically excite the cementing property of the fly ash and the gasified slag, and the first additive and the second additive cooperate to improve the pumping effect of the filling material during pumping and improve the compressive strength of the filling material after solidification, thereby meeting the requirements of construction on the filling material. The composition for preparing the filling material has low cost through efficient resource utilization of coal-based solid waste and coal-electricity solid waste, can reduce exploitation of natural resources, can reduce emission of the coal-based solid waste and the coal-electricity solid waste, and improves the ecological environment.
The application also provides a preparation method of the filling material, which comprises the step of preparing the filling material by adopting water and the composition for preparing the filling material.
In this example, the mass ratio of the aggregate, the cementitious material, the admixture and the water is: (30-60): (25-59): (0.03-1): (10-30).
As an example, the mass ratio of the aggregate, the cement, the admixture, and the water may be 30: 59: 1: 10 and 44.95: 42: 0.05: 13, etc.
The proportion range can ensure that the filling material has the effects of good pumpability and good condensation strength. If the proportion of the aggregate is too much, the compressive strength after later curing is not ideal.
Further, in this example, the mass ratio of the aggregate, the cementitious material, the admixture, and the water was 44.95: 42: 0.05: 13.
the proportion ensures that the prepared filling material has good pumpability during pump injection and better 28-day compressive strength after curing.
Still further, in some embodiments herein, the aggregate, cementitious material, admixture, and water are present in a mass ratio of 44.1: 42: 0.9: 13.
under the condition of keeping good pumpability, the prepared filling material can improve the 3-day compressive strength after curing.
Because the coal gangue has certain water absorption, the hydration process of the cementing material can be inhibited, so that the cement cannot be completely hydrated, the fluidity of the filling material is reduced during pump injection, more pores are formed after solidification, the compactness is low, the filling effect is poor, and the mechanical strength of the filling material is further influenced.
Therefore, in this embodiment, the preparation of the filling material requires mixing and stirring the admixture, the cementitious material and water, and then adding the aggregate for mixing and stirring. The aggregate can be prevented from absorbing a large amount of moisture, so that the cementing material can fully absorb the moisture to carry out a hydration process, and the fluidity of the filling material during pump injection is improved.
In this example, the specific steps for preparing the filling material using the composition for preparing the filling material provided in the present application and water are as follows: mixing and stirring cement, gasified slag and fly ash to prepare a cementing material, and mixing a first additive and a second additive to prepare an additive; mixing the prepared cementing material and the additive with water to prepare a mixed system, and then adding the aggregate into the mixed system to mix and stir.
Firstly, the cementing material, the additive and water are mixed and stirred to prepare a mixed system, and then the aggregate is added into the mixed system for mixing and stirring, so that the prepared filling material has a good pumpability effect.
Further, in this embodiment, before adding aggregate into a mixed system prepared by mixing and stirring the cementing material, the admixture and water, the coal gangue raw material needs to be crushed so that the particle size of the coal gangue is less than or equal to 7.00 mm; furthermore, the grain diameter of the coal gangue is less than or equal to 4.75 mm; furthermore, the grain diameter of the coal gangue is less than or equal to 4.00 mm; to avoid segregation of the final cured fill material. It should be noted that, in the application, after the coal gangue raw material is crushed, the coal gangue does not need to be further screened and graded, the crushed coal gangue raw material can form natural gradation, and the operation is simple and the cost is low.
Further, in this embodiment, in the step of mixing and stirring the cementitious material and the admixture with water to obtain the mixed system, the mixing and stirring temperature is 10 to 30 ℃, and the mixing and stirring time is 4 to 10min, so that the prepared filling material has good fluidity and cementing strength.
The preparation method of the filling material provided by the application at least has the following advantages:
the filling material prepared by the preparation method has a good pump injection effect during pump injection, and has good compressive strength after solidification.
The application also provides a method for filling the mine, which comprises the step of conveying the filling material prepared by the preparation method of the filling material into the mine to perform filling operation.
The filling material prepared by the preparation method provided by the application is sent to a mine for filling operation, and the filling material has a good pumping effect during pumping and has good compressive strength after solidification, so that the requirement of mine filling construction on the filling material can be met.
The features and properties of the present application are described in further detail below with reference to examples.
Example 1
This example provides a filling material, which is prepared by the following steps:
(1) crushing the coal gangue to ensure that the particle size of the coal gangue is less than or equal to 4.75 mm;
(2) mixing and stirring 500g of cement, 500g of gasified slag and 3200g of fly ash to prepare a cementing material;
(3) fully mixing 2g of polycarboxylic acid water reducer with 2.5g of calcium lignosulfonate water reducer;
(4) 1300g of water is mixed with the prepared cementing material and the additive, and the mixture is stirred for 4min at the temperature of 20 ℃ to prepare a mixed system;
(5) 4495g of the coal gangue treated in the step (1) is added into the mixture system, and the mixture is mixed and stirred.
Examples 2 to 3, comparative examples 1 to 9
Examples 2-3 and comparative examples 1-9 differ from example 1 in the raw materials used to prepare the fill material, as shown in table 1 below:
TABLE 1
It should be noted that calcium formate is used as the organic early strength agent in the examples and comparative examples. In Table 1, "/" indicates that this substance was not used.
Test example 1
The filling materials prepared in examples 1-3 and comparative examples 1-9 are characterized in pump injection performance, and the truncated cone fluidity of the filling materials is tested by adopting a method specified in the GB/T8077-2000 standard; meanwhile, the filling materials prepared in examples 1 to 3 and comparative examples 1 to 9 were subjected to mechanical strength characterization, the prepared filling materials were pumped into a 30mm by 30mm mold, and the cured filling materials were tested for 3-day compressive strength and 28-day compressive strength using a HYM-300 type cement constant stress pressure tester, and the test results are shown in Table 2.
TABLE 2
As can be seen from table 2:
compared with comparative examples 1 to 9, the filling materials provided in examples 1 to 3 of the present application all have truncated cone fluidity greater than 260mm during pumping, and all have compressive strength greater than 2.0MPa for 3 days after curing and greater than 8.0MPa for 28 days, which indicates that the filling materials provided in examples 1 to 3 have better fluidity during pumping and certain compressive strength after curing, and can meet the requirements of construction on the pumping performance and the compressive strength after curing of the filling materials.
In the comparative example 1, the truncated cone fluidity of the filling material prepared by only using the polycarboxylate superplasticizer as the additive is obviously reduced during pump injection, because the polycarboxylate superplasticizer is influenced by soil contained in the coal gangue aggregate, the fluidity does not reach the standard, and pumping cannot be realized; and the compressive strength after 28 days of curing is only 5.1MPa, and the requirement of construction on the compressive strength of the filling material after curing cannot be met.
In the comparative example 2, the compressive strength of the filling material prepared by using the calcium lignosulfonate water reducing agent as the additive is only 3.3MPa after curing for 28 days, and the requirement of construction on the compressive strength of the filling material after curing cannot be met.
In the comparative example 3, the truncated cone fluidity of the filling material prepared by only using the dispersible emulsion powder is obviously reduced to 125mm during pumping, and pumping cannot be realized.
In the comparative example 4, the truncated cone fluidity of the filling material prepared by only using the organic early strength agent is obviously reduced to 118mm during pumping, and pumping cannot be realized; and the compressive strength after curing for 28 days is only 3.6MPa, and the compressive strength is not good.
The filling material prepared without the additive in the comparative example 5 has unsatisfactory pumping performance during pumping and compressive strength after curing, and cannot meet the requirements of construction on the filling material.
Therefore, the composition for preparing the filling material is added with the polycarboxylic acid water reducing agent and compounded with the calcium lignosulfonate water reducing agent, the dispersible latex powder or the organic early strength agent as the additive, and compared with the filling material prepared by singly using the polycarboxylic acid water reducing agent, the calcium lignosulfonate water reducing agent, the dispersible latex powder or the organic early strength agent as the additive and not adding the additive, the pumping performance can be obviously improved, certain 3-day compressive strength and 28-day compressive strength can be simultaneously achieved, and the requirements of construction on the filling material are met.
The coal gangue aggregate proportion in the comparative example 6 is too high, the proportion of the cementing material is low, and the pumping performance of the prepared filling material during pumping and the compressive strength after curing are not ideal.
The cement content of the cement in comparative example 7 was only 4.8%, which was too low, so that the 3-day compressive strength and 28-day compressive strength of the prepared filling material after curing were not satisfactory.
In comparative example 8, the proportion of the polycarboxylic acid water reducing agent in the additive is 22.2%, and the proportion of the calcium lignosulfonate water reducing agent in the additive is 77.8%; the proportion of the polycarboxylic acid water reducing agent in the additive in the comparative example 9 is 22.2%, and the proportion of the dispersible latex powder in the additive is 77.8%; under the condition of the mixture ratio of the additive, the prepared filling material has poor fluidity and can not realize pump injection.
Therefore, the proportion of the components of the composition for preparing the filling material is beneficial to improving the pumping performance of the filling material during pump injection and the compressive strength of the filling material after solidification.
Therefore, the filling material provided by the application has a better pump injection effect when being pumped and has certain compressive strength after being cured, and can meet the requirements of construction on the filling material.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A composition for preparing a filling material, which is characterized by comprising an aggregate, a cementing material and an admixture;
the aggregate comprises coal gangue;
the cementing material comprises cement, gasified slag and fly ash;
the admixture comprises a first admixture and a second admixture; the first admixture comprises a polycarboxylic acid water reducing agent; the second additive comprises any one of a calcium lignosulfonate water reducing agent, dispersible latex powder and an organic early strength agent.
2. The composition for preparing a filling material according to claim 1, wherein the mass ratio of the aggregate, the cementitious material and the admixture is (30-60): (25-59): (0.03-1);
optionally, the mass ratio of the aggregate, the cementing material and the admixture is 44.95: 42: 0.05.
3. the composition for preparing a filling material according to claim 2, wherein the admixture comprises 40 to 70 mass percent of the first admixture and 30 to 60 mass percent of the second admixture; the second additive comprises a calcium lignosulfonate water reducing agent;
optionally, the second additive comprises a calcium lignosulfonate water reducing agent, and the mass ratio of the first additive to the second additive is 1: 1.
4. the composition for preparing a filling material according to claim 2, wherein the admixture comprises 50 to 80 mass percent of the first admixture and 20 to 50 mass percent of the second admixture; the second additive comprises dispersible latex powder;
optionally, the second additive comprises dispersible latex powder, and the mass ratio of the first additive to the second additive is 2: 1.
5. the composition for preparing a filling material according to claim 2, wherein the admixture comprises 2 to 10 mass percent of the first admixture and 90 to 98 mass percent of the second admixture; the second additive comprises an organic early strength agent;
optionally, the second additive comprises an organic early strength agent, and the mass ratio of the first additive to the second additive is 10: 1.
6. the composition for preparing a filling material according to claim 2, wherein the cementing material comprises the following components in percentage by mass:
10-40% of the cement, 1-30% of the gasified slag, and 30-89% of the fly ash;
optionally, the mass ratio of the cement to the gasified slag to the fly ash is 1: 1: 6.5.
7. the composition for preparing filling material as claimed in claim 1, wherein the coal gangue has a particle size of 7.00mm or less;
optionally, the coal gangue has a particle size of 4.75mm or less.
8. A method for producing a filling material, comprising preparing a filling material using water and the composition for producing a filling material according to any one of claims 1 to 7;
and mixing and stirring the admixture, the cementing material and the water, and then adding the aggregate for mixing and stirring.
9. The method for preparing the filling material according to claim 8, wherein the mass ratio of the aggregate, the cementing material, the admixture and the water is as follows: (30-60): (25-59): (0.03-1): (10-30);
optionally, the mass ratio of the aggregate, the cementitious material, the admixture, and the water is 44.95: 42: 0.05: 13.
10. a method of filling a mine, comprising: feeding the filling material prepared by the method according to any one of claims 8 to 9 into a mine shaft for filling.
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| CN116003055A (en) * | 2022-12-22 | 2023-04-25 | 陕西碳提取节能环保科技(集团)有限公司 | Coal chemical industry gasification slag coal gangue backfill and preparation method thereof |
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| CN114349405B (en) | 2022-12-23 |
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