CN113735538A

CN113735538A - Solid cementing material and preparation method and application thereof

Info

Publication number: CN113735538A
Application number: CN202110871526.7A
Authority: CN
Inventors: 舒新前; 舒元锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-12-03
Anticipated expiration: 2041-07-30
Also published as: CN113735538B

Abstract

The invention provides a solid cementing material and a preparation method and application thereof, belonging to the technical field of resource utilization of solid wastes. The invention takes coal-based bulk solid wastes such as coal gangue, coal-fired ash, fly ash, gasified ash, desulfurized gypsum and the like as main raw materials, selects industrial solid wastes such as construction waste, magnesium slag, steel slag, carbide slag, red mud and the like as auxiliary raw materials nearby according to the composition and basic properties of the coal-based solid wastes, prepares coarse aggregate, fine aggregate and gelling agent, and then uniformly mixes the coarse aggregate, the fine aggregate, the gelling agent and the desulfurized gypsum to obtain the solid gelling material. The solid cementing material can be used as a filling, isolating and anti-seepage material, has the characteristics of stable performance, high filling rate, good compactness, high early strength, good isolating effect, good anti-seepage property and the like, can be used as a solid filling material for quickly filling a large-mining-height fully-mechanized top coal caving working face, and can also be used as an anti-seepage isolating material for a solid waste storage yard.

Description

Solid cementing material and preparation method and application thereof

Technical Field

The invention relates to the technical field of solid waste treatment and resource utilization, in particular to a solid cementing material and a preparation method thereof.

Background

The method is suitable for the important requirements of mining and filling and 'under three' coal pressing mining, and particularly, the development of a rapidly-propelled mining and filling technology is very needed to meet the requirements of rapidly-propelled mining and filling of a large-mining-height fully-mechanized top coal caving working face. The solid filling mining technology is convenient to use and high in filling speed, and undoubtedly plays an important role. The current solid filling technology comprises working face filling and roadway filling, and mainly comprises the steps of properly crushing 'white gangue' generated by roadway excavation and working face mining and partial washed coal gangue generated by coal preparation in a coal preparation plant, conveying the crushed coal gangue to an underground working face or a roadway filling space by using a belt system, and repeatedly pushing and tamping by a tamping device to realize goaf filling. The application result shows that the solid filling mining technology is influenced by the problems of unstable performance, high carbon content and the like of the filling material, so that the performance of a filling body is not stable enough, the cementation degree is poor, the compaction degree is relatively low, the filling effect is correspondingly influenced, and the settlement reducing effect on the earth surface needs to be further improved. Obviously, it is necessary to develop an in-depth research of the filling material preparation technology, develop a cementing material with good filling performance, and particularly, to achieve product standardization and serialization by basically unifying the specifications of the preparation raw materials and basically standardizing the preparation process, so as to meet the requirement of rapidly promoting the top coal caving mining and filling at a large mining height.

Disclosure of Invention

The invention aims to provide a solid cementing material, and a preparation method and application thereof, wherein the method can be used for preparing normalized and serialized solid cementing materials for filling isolation and seepage prevention, controlling mining subsidence and damage and simultaneously realizing full resource utilization of solid wastes.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides a preparation method of a solid cementing material, which comprises the following steps:

grading and grading the coal gangue to obtain coal, a first stone C1 with the granularity of +5mm and first sand F1 with the granularity of-5 mm;

grading and grading the construction waste to obtain organic matters, metals, second stone C2 with the granularity of +5mm and second sand F2 with the granularity of-5 mm;

sequentially crushing and screening the coal ash to obtain coal coarse slag C3 with the granularity of +5mm and coal fine slag F3 with the granularity of-5 mm;

sieving the gasified ash to obtain coarse gasified ash B1 with the granularity of +0.5mm and fine gasified ash G1 with the granularity of-0.5 mm;

screening the industrial waste residues to obtain industrial waste residue coarse residue B2 with the granularity of +0.5mm and industrial waste residue fine residue G2 with the granularity of-0.5 mm;

mixing the first stone C1, the second stone C2 and the coal-fired coarse slag C3 to obtain coarse aggregate;

mixing the first sand F1, the second sand F2, the coal fine slag F3, the gasification ash slag coarse slag B1 and the industrial residue coarse slag B2 to obtain fine aggregate;

mixing the gasified ash slag fine slag G1, the industrial waste slag fine slag G2, the fly ash G3 and the cement G4 to obtain a gelling agent;

and mixing the coarse aggregate, the fine aggregate, the gelling agent and the desulfurized gypsum to obtain the solid cementing material.

Preferably, the industrial waste residue comprises magnesium slag, steel slag, red mud or carbide slag.

Preferably, the mass contents of the first stone C1, the second stone C2 and the coal-fired coarse slag C3 in the coarse aggregate are 55-75%, 10-20% and 15-25% in sequence, wherein the total mass fraction of all the components in the coarse aggregate is 100%.

Preferably, the mass contents of the first sand F1, the second sand F2, the fire coal fine slag F3, the gasification ash slag coarse slag B1 and the industrial waste slag coarse slag B2 in the fine aggregate are 45-60%, 5-10%, 10-20% and 15-30% in sequence, wherein the total mass fraction of all the components in the fine aggregate is 100%.

Preferably, the mass percentages of all the components in the gelling agent are 100%, and the mass contents of the gasified ash slag fine slag G1, the industrial waste slag fine slag G2, the fly ash G3 and the cement G4 in the gelling agent are 5-15%, 15-30%, 45-60% and 15-30% in sequence.

Preferably, the mass contents of the coarse aggregate, the fine aggregate, the gelling agent and the desulfurized gypsum in the solid cementing material are 30-45%, 40-55%, 10-20% and 5-20% in sequence, taking the total mass fraction of all the components in the solid cementing material as 100%.

The invention provides the solid cementing material prepared by the preparation method in the technical scheme.

Preferably, the relative compactness of the solid gelling material is > 0.67; the compressive strength of 3-day old is more than 0.55 MPa.

The invention provides the application of the solid cementing material in the technical scheme in the isolation and seepage prevention of industrial solid waste storage yards, mine mining filling or isolation and plugging of mine water and fire areas.

The invention provides a preparation method of a solid cementing material, which takes bulk coal-based solid wastes such as coal gangue, coal-fired ash, fly ash, gasified ash and desulfurized gypsum as main raw materials, selects construction wastes and industrial waste residues such as magnesium slag, steel slag, red mud and carbide slag as auxiliary raw materials nearby according to the composition and basic properties of the coal-based solid wastes, obtains coarse aggregate and fine aggregate by graded crushing and screening separation, simultaneously mixes the gasified ash fine slag, fly ash, industrial waste residue fine slag and cement to form a gelling agent, and mixes the coarse aggregate, fine aggregate, gelling agent and desulfurized gypsum according to the proportion to prepare the solid cementing material which has the characteristics of stable performance, high filling efficiency, high compactness, high early strength, good isolation performance and the like, and can realize the rapid filling of large mining high fully-mechanized top coal mining and the water-fire area of a mine, The isolation and seepage-proofing treatment of industrial solid waste storage yard.

Based on the reality that a large amount of coal-based solid wastes such as mine coal gangue, coal-fired ash, fly ash, gasified ash, desulfurized gypsum and the like are generated and stockpiled, the coal-based solid waste treatment and resource utilization and mine mining filling are cooperatively promoted, the coal-based solid wastes of the mine and surrounding construction wastes and industrial waste residues are utilized in a large scale, organic matters such as coal and the like are separated through grading and quality-separating treatment, a series of solid cementing materials with stable performance are prepared, the isolation and seepage prevention are realized for coal mining filling, mine water and fire area isolation, coal gangue and other industrial solid wastes stockyard isolation and seepage prevention, a series of solid cementing materials with stable performance is prepared, and the effective treatment and resource utilization of the mine solid wastes are realized.

Drawings

FIG. 1 is a flow chart of the preparation of the solid cement of the present invention.

Detailed Description

The invention provides a preparation method of a solid cementing material mainly based on coal-based solid waste, which comprises the following steps:

In the present invention, unless otherwise specified, all the necessary preparation raw materials are related materials of which the sources are well known to those skilled in the art.

According to the invention, coal gangue is classified to obtain coal, a first stone C1 with the granularity of +5mm and a first sand F1 with the granularity of-5 mm. The invention has no special limitation on the source and specification of the coal gangue, and the coal gangue can be obtained according to a mode well known in the field; in the embodiment of the invention, coal gangue in a certain mining area of Shaanxi and inner Mongolia is specifically selected, and the components of the coal gangue are respectively shown in tables 1 and 2:

TABLE 1 composition of major chemical components of certain coal gangue (SC) in Shaanxi

Composition of	SiO₂	Al₂O₃	Fe₂O₃	CaO	K₂O	Na₂O	MgO	TiO₂	Loss on ignition
										Mass content/%)	63.03	22.35	4.04	3.54	2.35	1.47	1.56	0.84	24.56

TABLE 2 main chemical composition of coal gangue (NC)

Composition of	SiO₂	Al₂O₃	Fe₂O₃	CaO	K₂O	Na₂O	MgO	TiO₂	Loss on ignition
										Mass content/%)	44.14	26.55	4.29	5.18	2.25	1.36	1.12	0.81	31.52

In the present invention, the coal gangue classification and quality separation method is preferably a classification and quality separation method of coal gangue disclosed in the patent (CN111515017A, published 2020, 8/11/h) to separate the coal gangue into coal, +5mm of first stone C1 and-5 mm of first sand F1.

According to the invention, the construction waste is classified to obtain organic matters, metals, second stone C2 with the granularity of +5mm and second sand F2 with the granularity of-5 mm. In the invention, the construction waste is preferably selected from mines and construction waste around the mines; the invention has no special limitation on the types of the construction wastes, and can be realized by the well-known construction wastes.

In the present invention, the grading and quality-classifying process of the construction waste is preferably performed by referring to a grading and quality-classifying method of coal gangue disclosed in patent (CN111515017A, published 2020, 8/11/h), and the coal gangue therein may be replaced by the construction waste.

The invention sequentially crushes and sieves the coal ash to obtain coal coarse slag C3 with the granularity of +5mm and coal fine slag F3 with the granularity of-5 mm. The source and the type of the coal ash are not particularly limited, and the coal ash can be obtained according to a mode well known in the field. The process of crushing and screening the coal ash is not particularly limited, and the coal coarse slag and the coal fine slag with the particle size requirements can be obtained according to the well-known process in the field.

The invention sieves the gasified ash to obtain the coarse gasified ash B1 with the granularity of +0.5mm and the fine gasified ash G1 with the granularity of-0.5 mm. The source and the type of the gasified ash are not particularly limited in the invention, and the gasified ash can be obtained according to a mode well known in the field. The screening process of the gasified ash is not particularly limited, and the coarse gasified ash B1 with the thickness of +0.5mm and the fine gasified ash with the thickness of-0.5 mm can be obtained according to the screening process well known in the art.

The industrial waste residue is screened to obtain the industrial waste residue coarse residue B2 with the granularity of +0.5mm and the industrial waste residue fine residue G2 with the granularity of-0.5 mm. The source and specification of the industrial waste residue are not particularly limited, and the industrial waste residue can be obtained according to a mode well known in the field. In the invention, the industrial waste slag is preferably magnesium slag, steel slag, red mud or carbide slag at the periphery of a mining area. The screening process of the industrial waste residue is not particularly limited, and the coarse waste residue and the fine waste residue with required particle sizes can be obtained according to the well-known process in the field.

After the first stone C1, the second stone C2 and the coal-fired coarse slag C3 are obtained, the first stone C1, the second stone C2 and the coal-fired coarse slag C3 are mixed to obtain coarse aggregate. The mixing process of the first stone C1, the second stone C2 and the coal-fired coarse slag C3 is not particularly limited, and the materials can be uniformly mixed according to the process well known in the art. In the invention, the mass contents of the first stone C1, the second stone C2 and the coal-fired coarse slag C3 in the coarse aggregate are 55-75%, 10-20% and 15-25% in sequence by taking the total mass fraction of all the components in the coarse aggregate as 100%.

After first sand F1, second sand F2, coal-fired fine slag F3, gasified ash slag coarse slag B1 and industrial waste slag coarse slag B2 are obtained, the first sand F1, the second sand F2, the coal-fired fine slag F3, the gasified ash slag coarse slag B1 and the industrial waste slag coarse slag B2 are mixed to obtain fine aggregate. The process for mixing the first sand F1, the second sand F2, the coal-fired fine slag F3, the gasified ash slag coarse slag B1 and the industrial waste slag coarse slag B2 is not specially limited, and the materials can be uniformly mixed according to the process known in the art. In the invention, the mass contents of the first sand F1, the second sand F2, the fire coal fine slag F3, the gasification ash slag coarse slag B1 and the industrial waste slag coarse slag B2 in the fine aggregate are 45-60%, 5-10%, 10-20% and 15-30% in sequence, wherein the total mass fraction of all the components in the fine aggregate is 100%.

After the gasification ash G1 and industrial waste residue G2 are obtained, the invention mixes the gasification ash G1, waste residue G2, fly ash G3 and cement G4 to obtain the gelling agent. In the present invention, the cement is preferably ordinary portland cement or slag cement, and the ordinary portland cement and slag cement are not particularly limited in the present invention, and commercially available products well known in the art may be selected.

The source of the fly ash is not particularly limited in the present invention, and the fly ash is obtained according to a manner well known in the art, and is preferably fly ash combusted in a fluidized bed boiler. In the embodiment of the invention, the fly ash is selected from fly ash in certain mining areas in Shaanxi and Nemeng, and the components of the fly ash are shown in tables 3 and 4 respectively.

TABLE 3 composition of main chemical components of certain fly ash (SF) in Shaanxi

TABLE 4 main chemical composition of fly ash (NF) of inner Mongolia

The process for mixing the gasified ash slag fine slag G1, the industrial waste slag fine slag G2, the fly ash G3 and the cement G4 is not particularly limited, and the materials can be uniformly mixed according to the process known in the art. In the invention, the mass percentages of all the components in the gelling agent are 100%, and the mass contents of the gasified ash slag fine slag G1, the industrial waste slag fine slag G2, the fly ash G3 and the cement G4 in the gelling agent are 5-15%, 15-30%, 45-60% and 15-30% in sequence.

After the coarse aggregate, the fine aggregate and the gelling agent are obtained, the coarse aggregate, the fine aggregate, the gelling agent and the desulfurized gypsum are mixed to obtain the solid cementing material. The source and specification of the desulfurized gypsum are not particularly limited and can be obtained in a manner well known in the art. The mixing process of the coarse aggregate, the fine aggregate, the gelling agent and the desulfurized gypsum is not particularly limited, and the materials can be uniformly mixed according to the process well known in the art. In the invention, the mass contents of the coarse aggregate, the fine aggregate, the gelling agent and the desulfurized gypsum in the solid cementing material are 30-45%, 40-55%, 10-20% and 5-20% in sequence by taking the total mass fraction of all the components in the solid cementing material as 100%.

FIG. 1 is a process flow diagram for preparing a solid cementing material based on coal-based solid waste, in which coal gangue is graded and graded to obtain coal, a first stone C1 with a particle size of +5mm and a first sand F1 with a particle size of-5 mm; grading and grading the construction waste to obtain organic matters, metals, second stone C2 with the granularity of +5mm and second sand F2 with the granularity of-5 mm; sequentially crushing and screening the coal ash to obtain coal coarse slag C3 with the granularity of +5mm and coal fine slag F3 with the granularity of-5 mm; sieving the gasified ash to obtain coarse gasified ash B1 with the granularity of +0.5mm and fine gasified ash G1 with the granularity of-0.5 mm; screening the industrial waste residues to obtain industrial waste residue coarse residue B2 with the granularity of +0.5mm and industrial waste residue fine residue G2 with the granularity of-0.5 mm; mixing the first stone C1, the second stone C2 and the coal-fired coarse slag C3 to obtain coarse aggregate; mixing the first sand F1, the second sand F2, the coal fine slag F3, the gasification ash slag coarse slag B1 and the industrial residue coarse slag B2 to obtain fine aggregate; mixing the gasified ash slag fine slag G1, the industrial waste slag fine slag G2, the fly ash G3 and the cement G4 to obtain a gelling agent; and mixing the coarse aggregate, the fine aggregate, the gelling agent and the desulfurized gypsum to obtain the solid cementing material.

In the present invention, the relative solidity Dr of the solid gelling material is preferably > 0.67; the compressive strength at 3 days of age is preferably > 0.55 MPa.

The invention provides the application of the solid cementing material in the technical scheme in the isolation and seepage prevention of industrial solid waste storage yards, mine mining filling or isolation and plugging of mine water and fire areas. In the present invention, the industrial solid waste preferably includes coal gangue. The method of the present invention is not particularly limited, and the method may be applied according to a method known in the art.

The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the following examples, coal gangue and fly ash in two mining areas of shanxi and inner Mongolia are selected as main raw materials, and are supplemented with construction waste and industrial waste residue in the mining areas or nearby to prepare the solid cementing material, wherein the chemical compositions of the coal gangue and the fly ash in the two mining areas are shown in tables 5-8:

TABLE 5 major chemical composition of certain coal gangue (SC) in Shaanxi

TABLE 6 main chemical composition of coal gangue (NC)

Composition of	SiO₂	Al₂O₃	Fe₂O₃	CaO	K₂O	Na₂O	MgO	TiO₂	Loss on ignition
										Content/%	44.14	26.55	4.29	5.18	2.25	1.36	1.12	0.81	31.52

TABLE 7 main chemical composition of certain fly ash (SF) in Shaanxi

Composition of	SiO₂	Al₂O₃	Fe₂O₃	CaO	K₂O	Na₂O	MgO	TiO₂	Loss on ignition
										Content/%	45.21	27.33	5.31	11.38	1.39	1.35	1.12	0.59	2.05

TABLE 8 main chemical composition of fly ash (NF) inner Mongolia

Composition of	SiO₂	Al₂O₃	Fe₂O₃	CaO	K₂O	Na₂O	MgO	TiO₂	Loss on ignition
										Content/%	49.96	29.66	4.98	5.00	2.69	2.11	1.78	0.67	1.59

TABLE 9 chemical composition of certain magnesium slag

Composition of	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	R₂O	Loss on ignition
								Content/%	27.39	1.06	5.77	56.91	8.41	0.67	0.09

TABLE 10 chemical composition of certain Steel slag

Composition of	SiO₂	Al₂O₃	Fe₂O₃	CaO	MnO	Cr₂O₃	MgO	TiO₂	P₂O₅
										Content/%	11.55	3.67	24.86	41.59	3.21	0.23	2.19	1.18	1.89

TABLE 11 chemical composition of certain carbide slag

Composition of	SiO₂	Al₂O₃	Fe₂O₃	CaO	SO₃	Na₂O	MgO	Others	Loss on ignition
										Content/%	4.69	1.85	1.03	55.14	0.81	0.11	0.58	3.67	25.66

TABLE 12 chemical composition of certain Red mud

Example 1

Sequentially carrying out grading crushing and screening separation on the coal gangue SC to obtain coal, a first stone C1 with the thickness of +5mm and first sand F1 with the thickness of-5 mm;

sequentially carrying out grading crushing and screening separation on the construction waste to obtain organic matters, metals, second stone C2 with the thickness of +5mm and second sand F2 with the thickness of-5 mm;

crushing and screening the coal ash to obtain coal coarse slag C3 of +5mm and coal fine slag F3 of-5 mm;

sieving the gasified ash to obtain a coarse gasified ash B1 with the thickness of 0.5mm and a fine gasified ash G1 with the thickness of-0.5 mm;

screening the magnesium slag to obtain magnesium slag coarse slag B2 with the thickness of +0.5mm and magnesium slag fine slag G2 with the thickness of-0.5 mm;

mixing C1, C2 and C3 according to the mass content of 65%, 15% and 20% to obtain coarse aggregate; mixing F1, F2, F3, B1 and B2 according to the mass content of 55%, 5%, 10% and 20% to obtain fine aggregate; mixing G1, G2, fly ash G3(SF) and No. 425 slag cement G4 according to the mass content of 10%, 15%, 55% and 20% to obtain a gelling agent;

and mixing the coarse aggregate, the fine aggregate, the gelling agent and the desulfurized gypsum according to the mass content of 35%, 45%, 15% and 5% to obtain the solid cementing material.

The solid cementing material prepared in example 1 is subjected to performance tests by referring to a method for detecting the relative compactness Dr of sandy soil and the compressive strength of concrete, and the results show that the relative compactness Dr is 0.85 and the compressive strength of 3-day-old concrete is 0.88 MPa.

Example 2

Sequentially carrying out grading crushing and screening separation on coal gangue NC to obtain coal, +5mm first stone C1 and-5 mm first sand F1;

screening the steel slag to obtain steel slag coarse slag B2 with the grain size of 0.5mm and steel slag fine slag G2 with the grain size of-0.5 mm;

mixing C1, C2 and C3 according to the mass content of 60%, 15% and 25% to obtain coarse aggregate; mixing F1, F2, F3, B1 and B2 according to the mass content of 50%, 5%, 12%, 13% and 20% to obtain fine aggregate; mixing G1, G2, fly ash G3(SF) and 425# Portland cement G4 according to the mass content of 10%, 15%, 57% and 18% to obtain a gelling agent;

The performance tests of the solid cement were carried out according to the method of example 1, and it was found that Dr of the solid cement was equal to 0.81 and that the 3-day-old compressive strength was 0.76 MPa.

Example 3

screening the carbide slag to obtain +0.5mm carbide slag coarse slag B2 and-0.5 mm carbide slag fine slag G2;

mixing C1, C2 and C3 according to the mass content of 60%, 15% and 25% to obtain coarse aggregate; mixing F1, F2, F3, B1 and B2 according to the mass content of 55%, 5%, 12%, 10% and 18% to obtain fine aggregate; mixing G1, G2, fly ash G3(NF) and No. 425 Portland cement G4 according to the mass content of 10%, 15%, 55% and 20% to obtain a gelling agent;

and mixing the coarse aggregate, the fine aggregate, the gelling agent and the desulfurized gypsum according to the mass content of 35%, 40%, 15% and 10% to obtain the solid cementing material.

The Dr of the solid cement, tested according to the method of example 1, was equal to 0.78, with a 3-day-old compressive strength of 0.80 MPa.

Example 4

screening the red mud to obtain red mud coarse slag B2 with the grain size of 0.5mm and red mud fine slag G2 with the grain size of-0.5 mm;

mixing C1, C2 and C3 according to the mass content of 55%, 20% and 25% to obtain coarse aggregate; mixing F1, F2, F3, B1 and B2 according to the mass content of 55%, 5%, 10% and 20% to obtain fine aggregate; mixing G1, G2, fly ash G3(NF) and No. 425 Portland cement G4 according to the mass content of 5%, 15%, 60% and 20% to obtain a gelling agent;

The Dr of the solid cement, tested according to the method of example 1, was equal to 0.82, with a 3-day-old compressive strength of 0.88 MPa.

Example 5

mixing C1, C2 and C3 according to the mass content of 60%, 15% and 25% to obtain coarse aggregate; mixing F1, F2, F3, B1 and B2 according to the mass content of 50%, 10%, 12%, 10% and 18% to obtain fine aggregate; mixing G1, G2, fly ash G3(NF) and No. 425 Portland cement G4 according to the mass content of 10%, 15%, 60% and 15% to obtain a gelling agent;

and mixing the coarse aggregate, the fine aggregate, the gelling agent and the desulfurized gypsum according to the mass content of 40%, 45%, 10% and 5% to obtain the solid cementing material.

The Dr of the solid cement, tested according to the method of example 1, was equal to 0.86, with a compressive strength at 3 days of age of 0.85 MPa.

Example 6

sequentially carrying out grading crushing and screening separation on the construction waste to obtain organic matters, second stone C2 with the thickness of +5mm and second sand F2 with the thickness of-5 mm;

screening the magnesium slag to obtain +0.5mm coarse slag B2 and-0.5 mm fine slag G2;

mixing C1, C2 and C3 according to the mass content of 65%, 15% and 20% to obtain coarse aggregate; mixing F1, F2, F3, B1 and B2 according to the mass content of 55%, 5%, 10% and 20% to obtain fine aggregate; mixing G1, G2, fly ash G3(SF) and 425# Portland cement G4 according to the mass content of 10%, 20%, 55% and 15% to obtain a gelling agent;

The Dr of the solid cement, tested according to the method of example 1, was equal to 0.80, with a 3-day-old compressive strength of 0.80 MPa.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims

1. A method for preparing a solid cementitious material, comprising the steps of:

2. The solid cementitious material of claim 1, wherein the industrial waste comprises magnesium slag, steel slag, red mud, or carbide slag.

3. The solid cementing material of claim 1, wherein the mass contents of the first stone C1, the second stone C2 and the coal-fired coarse slag C3 in the coarse aggregate are 55-75%, 10-20% and 15-25% in sequence, wherein the total mass fraction of all the components in the coarse aggregate is 100%.

4. The solid cementing material of claim 1, wherein the fine aggregate comprises 45-60%, 5-10%, 10-20% and 15-30% of the first sand F1, the second sand F2, the coal-fired fine slag F3, the gasified ash slag coarse slag B1 and the industrial waste slag coarse slag B2 in sequence by mass based on 100% of the total mass fraction of all the components in the fine aggregate.

5. The solid cementing material of claim 1, wherein the mass contents of the gasified ash slag fine slag G1, the industrial slag fine slag G2, the fly ash G3 and the cement G4 in the gelling agent are 5-15%, 15-30%, 45-60% and 15-30% in sequence, wherein the total mass fraction of all the components in the gelling agent is 100%.

6. The solid cementing material of claim 1, wherein the mass contents of the coarse aggregate, the fine aggregate, the gelling agent and the desulfurized gypsum in the solid filling material are 30-45%, 40-55%, 10-20% and 5-20% in sequence, based on 100% of the total mass fraction of all the components in the solid cementing material.

7. A solid gelled material prepared by the preparation method of any one of claims 1 to 6.

8. The solid cement according to claim 7, characterized in that it has a relative compactness > 0.67; the compressive strength of 3-day old is more than 0.55 MPa.

9. Use of the solid cement material according to claim 7 or 8 for isolation and seepage control of industrial solid waste storage yards, mine mining filling or isolation and plugging of mine water and fire areas.