CN113307589A - High-performance filling cementing material and preparation method thereof - Google Patents
High-performance filling cementing material and preparation method thereof Download PDFInfo
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- CN113307589A CN113307589A CN202110635254.0A CN202110635254A CN113307589A CN 113307589 A CN113307589 A CN 113307589A CN 202110635254 A CN202110635254 A CN 202110635254A CN 113307589 A CN113307589 A CN 113307589A
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- filling
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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
- C04B28/08—Slag 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
- 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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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a high-performance filling cementing material, which comprises slag micro powder and an excitation material, wherein the excitation material accounts for 20-30 wt%; the excitation material comprises the following components in parts by weight: 15-20 parts of desulfurized fly ash, 3-5 parts of sodium peroxide, 1-2 parts of a dispersing agent, 0.1-1 part of a crystallizing agent and 0.1-2 parts of a binder; also provides a preparation method of the high-performance filling cementing material; the invention gives full play to the excitation function of the desulfurized fly ash, fully releases the activity of the ore micropowder, and obviously improves the strength of the filling cementing material; the fluidity of the filling slurry is improved, and the blockage of a filling pipeline is reduced; crystalline substances are generated in the later period to fill gaps, the microcracks are self-repaired, and the compactness and the integrity of the filling body are improved; the adhesiveness of the filling slurry and the cohesiveness of the filling body are improved, the shock resistance of the filling body is improved, and the cracking of the filling body in the mining blasting process is prevented.
Description
Technical Field
The invention relates to the technical field of chemical building materials, in particular to a high-performance filling cementing material.
Background
The cemented filling mining method can effectively prevent the goaf from collapsing and reduce the stockpiling of a tailing pond, and is a safer, efficient and environment-friendly mining method; the quality of the filling body is important for ensuring the safety production of the cemented filling mining method, and is regarded as 'life engineering of mines'. The filling cementing material is an important component of the filling slurry and directly influences the quality of the filling body. At present, common cementing and filling cementing materials comprise cement, alkali slag cementing materials, gypsum cementing materials, cementing powder, high-water materials and the like, wherein the alkali-activated cementing materials are suitable for cementing fine-grain tailings, have the advantages of high strength, low cost and the like, and are widely used in mine filling engineering. CN111072296A discloses a quick-setting filling material prepared from slag powder, cement clinker, bentonite, steel slag powder, modified gypsum, an alkaline excitant, a coagulant, a water reducing agent, an anti-cracking material and a suspending agent, CN 103553482A discloses a filling cementing material special for coal mines, which is prepared from ordinary portland cement, blast furnace slag micro powder, industrial waste gypsum, carbide slag, fly ash, an additive, citric acid and an excitant, and CN 103803929A discloses a filling cementing material prepared from slag micro powder, desulfurized ash, quicklime, mirabilite, sodium sulfite or sodium hydroxide.
Compared with desulfurized gypsum, the desulfurized fly ash has fine particles and low water content, contains components such as calcium sulfite and calcium hydroxide, does not need drying treatment, and can play a dual excitation role on the slag micro powder, but because the calcium sulfite is difficult to dissolve and the sulfate excitation role on the ore micro powder is weaker than that of calcium sulfate, the activity of the ore micro powder is difficult to fully excite. In the existing domestic mine filling, the filling slurry is generally high in concentration and insufficient in fluidity, and the filling pipe blockage is easily caused when the filling multiple line is large; when the filling material is filled into a goaf, bleeding, dehydration, sinking and shrinking and the like can occur, plastic cracking, delamination and the like are easily caused, the integrity and the compactness of the filling body are poor, and the strength of the filling body is seriously reduced.
Disclosure of Invention
The invention aims to overcome the defects and provide a high-performance filling cementing material and a preparation method thereof.
The invention adopts the following technical scheme:
the high-performance filling cementing material comprises slag micropowder and an excitation material, wherein the excitation material accounts for 20-30 wt%; the excitation material comprises the following components in parts by weight: 15-20 parts of desulfurized fly ash, 3-5 parts of sodium peroxide, 1-2 parts of a dispersing agent, 0.1-1 part of a crystallizing agent and 0.1-2 parts of a binder; the dispersing agent is one or more of sodium naphthalene sulfonate, sodium tripolyphosphate and sodium hexametaphosphate; the crystallizing agent is one of silicone zirconium, lithium silicate and ferric chloride; the adhesive is one or more of ethyl acetate polymer latex powder, ethylene-vinyl acetate copolymer latex powder, vinyl acetate-vinyl versatate copolymer latex powder, polyvinyl alcohol rubber powder and sodium silicate.
Preferably, the desulfurized ash is one or two of sintered flue gas desulfurized ash of a steel plant and coal-fired flue gas desulfurized ash of a thermal power plant.
Preferably, the allowance of the 325-mesh desulfurized ash is less than or equal to 12 percent; SO of the desulfurized fly ash3The content is more than or equal to 30 percent; the pH value of the desulfurized fly ash is more than or equal to 10.
Preferably, the specific surface area of the slag micro powder is more than or equal to 400 square meters per kg, the activity coefficient of more than or equal to 70 percent in 7 days, the activity coefficient of more than or equal to 95 percent in 28 days and the water content of less than or equal to 1 percent.
A preparation method for preparing a high-performance filling cementing material comprises the following steps:
weighing the desulfurized fly ash, the sodium peroxide, the dispersing agent, the crystallizing agent and the adhesive according to the proportion, and uniformly stirring and mixing for 3-5 min to prepare the excitation material.
And step two, weighing the slag micro powder and the excitation material according to the proportion, and uniformly mixing to obtain the slag excitation material.
Preferably, in the first step, the desulfurized fly ash, the sodium peroxide, the dispersing agent, the crystallizing agent and the adhesive are weighed according to a certain proportion and are uniformly mixed in a forced mixer for 3-5 min to prepare the excitation material, and then the excitation material is conveyed to an excitation material powder bin by bucket elevator; and in the second step, weighing the slag micro powder and the exciting material according to the proportion, uniformly mixing the slag micro powder and the exciting material in a single-shaft paddle continuous mixer by adopting single-shaft screw conveying, and conveying the slag micro powder and the exciting material to a cementing material bin by adopting bucket lifting.
The invention has the beneficial effects that: the invention gives full play to the excitation function of the desulfurized fly ash, fully releases the activity of the ore micropowder, and obviously improves the strength of the filling cementing material; the fluidity of the filling slurry is improved, and the blockage of a filling pipeline is reduced; crystalline substances are generated in the later period to fill gaps, the microcracks are self-repaired, and the compactness and the integrity of the filling body are improved; the adhesiveness of the filling slurry and the cohesiveness of the filling body are improved, the shock resistance of the filling body is improved, and the cracking of the filling body in the mining blasting process is prevented.
Detailed Description
In order to make the purpose and technical solution of the present invention clearer, the present invention is further described with reference to the following examples:
example 1
Weighing 15 parts of desulfurization ash, 3 parts of sodium peroxide, 1 part of naphthalene sodium sulfonate, 0.5 part of silicone zirconium and 1.5 parts of ethyl acetate polymer latex powder, uniformly mixing for 3min in a forced mixer to prepare an excitation material, conveying the excitation material to an excitation material powder bin for later use by bucket lifting, weighing 20 parts of excitation material by adopting double-pipe spiral feeding, loading the excitation material into a single-shaft paddle continuous mixer, adding 80 parts of slag micropowder, and uniformly mixing to prepare the high-performance cementing material; the average grain size of the tailings is 37.5 mu m, the tailings are evenly mixed into filling slurry by a mortar mixer according to the filling concentration of 70 percent and the mortar ratio of 1:10, a test block with the thickness of 70.7mm is formed, the fluidity of the slurry is measured to be 195mm, and the compressive strengths of the test blocks 7d, 28d, 60d and 90d are respectively 1.20MPa, 2.35MPa, 3.12MPa and 3.65 MPa. The self-flowing filling can be realized, the filling strength meets the design requirement, and the later strength is continuously improved.
Example 2
Weighing 18 parts of desulfurized fly ash, 4 parts of sodium peroxide, 1.5 parts of sodium tripolyphosphate, 0.8 part of lithium silicate and 0.7 part of polyvinyl alcohol rubber powder, uniformly mixing for 3min in a forced mixer to prepare an excitation material, conveying the excitation material to an excitation material powder bin for later use by bucket lifting, weighing 25 parts of the excitation material by a double-pipe screw feeder, loading the excitation material into a single-shaft paddle continuous mixer, adding 75 parts of slag micropowder, and uniformly mixing to prepare the high-performance cementing material; the average grain size of the tailings is 38.1 mu m, the tailings are evenly mixed into filling slurry by a mortar mixer according to the filling concentration of 70% and the mortar ratio of 1:10, then a test block with 70.7mm is formed, the fluidity of the slurry is 200mm, and the compressive strengths of the test blocks 7d, 28d, 60d and 90d are 1.28MPa, 2.53MPa, 3.24MPa and 3.72MPa respectively. The self-flowing filling can be realized, the filling strength meets the design requirement, and the later strength is continuously improved.
Example 3
Weighing 20 parts of desulfurization ash, 5 parts of sodium peroxide, 2 parts of sodium hexametaphosphate, 1 part of ferric chloride and 1 part of sodium silicate, uniformly mixing for 3min in a forced mixer to prepare an excitation material, conveying the excitation material to an excitation material powder bin for later use by bucket lifting, weighing 29 parts of excitation material by a double-pipe screw feeder, loading the excitation material into a single-shaft paddle continuous mixer, adding 71 parts of slag micropowder, and uniformly mixing to prepare the high-performance cementing material. The average grain size of the tailings is 37.5 mu m, the tailings are uniformly mixed into filling slurry by a mortar mixer according to the filling concentration of 70% and the mortar ratio of 1:10, then a test block with 70.7mm is formed, the fluidity of the slurry is 205mm, and the compressive strengths of the test blocks 7d, 28d, 60d and 90d are 1.15MPa, 2.21MPa, 2.95MPa and 3.43MPa respectively. The self-flowing filling can be realized, the filling strength meets the design requirement, and the later strength is continuously improved.
The principle and the advantages of the invention are as follows: firstly, sodium peroxide reacts chemically with water to generate sodium hydroxide and oxygen, so that the alkalinity of slurry can be improved and the alkali excitation effect on ore micro powder is promoted; on the other hand, the calcium sulfite can be oxidized into calcium sulfate, so that the sulfate excitation effect on the ore micro powder is improved, the bubble content of the slurry can be improved, and the conveying resistance of the filling slurry is reduced; secondly, the crystallizing agent can react with hydrated substances of the desulfurized fly ash and the slag micro powder to generate a large amount of water-insoluble crystallized substances which are filled in cracks and pores generated by water loss, so that the compactness of the filling body can be improved, and the strength of the filling body is further improved; thirdly, the adhesive can enhance the cohesiveness among the filling tailings, improve the integrity and the shock resistance of the filling body and reduce roof fall rib spalling in the filling body excavation and mining blasting processes; fourthly, preparing the high-performance cementing material step by step, and adopting different stirring and mixing processes. The excitation material has more components and wide mixing range, and the uniformity of the material can be ensured by forcibly stirring and mixing; the finished product of the cementing material is mixed by adopting a single-shaft paddle continuous mixing mode, so that the yield can be obviously improved.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The components used in the present invention are all standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experiments.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the present invention.
Claims (6)
1. A high-performance filled cementitious material, characterized by:
the high-performance filling cementing material comprises slag micro powder and an excitation material, wherein the excitation material accounts for 20-30% of the weight of the slag micro powder;
the excitation material comprises the following components in parts by weight: 15-20 parts of desulfurized fly ash, 3-5 parts of sodium peroxide, 1-2 parts of a dispersing agent, 0.1-1 part of a crystallizing agent and 0.1-2 parts of a binder;
the dispersing agent is one or more of sodium naphthalene sulfonate, sodium tripolyphosphate and sodium hexametaphosphate;
the crystallizing agent is one of silicone zirconium, lithium silicate and ferric chloride;
the adhesive is one or more of ethyl acetate polymer latex powder, ethylene-vinyl acetate copolymer latex powder, vinyl acetate-vinyl versatate copolymer latex powder, polyvinyl alcohol rubber powder and sodium silicate.
2. The high-performance filled cementitious material of claim 1, wherein:
the desulfurization ash is one or two of sintering flue gas desulfurization ash of a steel plant and coal-fired flue gas desulfurization ash of a thermal power plant.
3. A high performance filled cementitious material according to claim 1 or 2, characterised in that:
the allowance of the desulfurized ash sieved by 325 meshes is less than or equal to 12 percent;
SO of the desulfurized fly ash3The content is more than or equal to 30 percent;
the pH value of the desulfurized fly ash is more than or equal to 10.
4. The high-performance filled cementitious material of claim 1, wherein:
the specific surface area of the slag micro powder is more than or equal to 400 square meters per kg, the activity coefficient of the slag micro powder is more than or equal to 70 percent in 7 days, the activity coefficient of the slag micro powder is more than or equal to 95 percent in 28 days, and the water content is less than or equal to 1 percent.
5. A method for preparing the high-performance filled cementitious material of claim 1, comprising the steps of:
weighing desulfurized fly ash, sodium peroxide, a dispersing agent, a crystallizing agent and an adhesive according to a ratio, and uniformly stirring and mixing for 3-5 min to prepare an excitation material;
and step two, weighing the slag micro powder and the excitation material according to the proportion, and uniformly mixing to obtain the slag excitation material.
6. The method for preparing the high-performance filled cementing material according to the claim 5, characterized in that:
in the first step, the desulfurization ash, the sodium peroxide, the dispersing agent, the crystallizing agent and the adhesive are weighed according to a proportion and are uniformly mixed in a forced mixer for 3-5 min to prepare an excitation material, and then the excitation material is conveyed to an excitation material powder bin by bucket elevator;
and in the second step, weighing the slag micro powder and the exciting material according to the proportion, uniformly mixing the slag micro powder and the exciting material in a single-shaft paddle continuous mixer by adopting single-shaft screw conveying, and conveying the slag micro powder and the exciting material to a cementing material bin by adopting bucket lifting.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114163155A (en) * | 2021-12-02 | 2022-03-11 | 电子科技大学长三角研究院(湖州) | Preparation and application of novel improved composite steel slag excitant |
| CN115028398A (en) * | 2022-07-04 | 2022-09-09 | 宿迁立新建材有限公司 | Undisturbed waterworks tail mud composite curing material |
| CN115043627A (en) * | 2022-06-27 | 2022-09-13 | 济南大学 | High-toughness thin water-spraying cement-based material and preparation method and application thereof |
| CN115849782A (en) * | 2022-12-06 | 2023-03-28 | 云南云天化股份有限公司 | Alkali-activated geopolymer cemented superfine phosphorus tailing filling material and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114163155A (en) * | 2021-12-02 | 2022-03-11 | 电子科技大学长三角研究院(湖州) | Preparation and application of novel improved composite steel slag excitant |
| CN115043627A (en) * | 2022-06-27 | 2022-09-13 | 济南大学 | High-toughness thin water-spraying cement-based material and preparation method and application thereof |
| CN115043627B (en) * | 2022-06-27 | 2023-05-26 | 济南大学 | High-toughness thin water-spraying mud-based material, and preparation method and application thereof |
| CN115028398A (en) * | 2022-07-04 | 2022-09-09 | 宿迁立新建材有限公司 | Undisturbed waterworks tail mud composite curing material |
| CN115849782A (en) * | 2022-12-06 | 2023-03-28 | 云南云天化股份有限公司 | Alkali-activated geopolymer cemented superfine phosphorus tailing filling material and preparation method thereof |
| CN115849782B (en) * | 2022-12-06 | 2024-05-28 | 云南云天化股份有限公司 | Alkali-activated geopolymer-cemented ultrafine phosphate tailing filling material and preparation method thereof |
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