CN112745049A - Coal gangue-based admixture and preparation method thereof - Google Patents
Coal gangue-based admixture and preparation method thereof Download PDFInfo
- Publication number
- CN112745049A CN112745049A CN202110017088.8A CN202110017088A CN112745049A CN 112745049 A CN112745049 A CN 112745049A CN 202110017088 A CN202110017088 A CN 202110017088A CN 112745049 A CN112745049 A CN 112745049A
- Authority
- CN
- China
- Prior art keywords
- gangue
- parts
- powder
- gypsum
- based admixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
-
- 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
The invention discloses a coal gangue-based admixture and a preparation method thereof, wherein the preparation method comprises the following steps: the gangue-based admixture is prepared by using 80-90 parts of gangue as a raw material, pre-grinding the gangue into powder, wet mixing, steaming and calcining gangue powder, 5-15 parts of calcium oxide and 5-15 parts of gypsum, cooling a calcined product, then co-grinding the cooled calcined product and 3-6 parts of silane coupling agent, and finally mixing the co-ground product with 15-20 parts of fly ash and 5-10 parts of limestone powder to obtain the gangue-based admixture. The coal gangue content of the coal gangue-based admixture prepared by the invention is more than or equal to 70 percent, the fluidity ratio of the prepared mortar is more than or equal to 97 percent, the activity is more than or equal to 85 percent, and the workability of the concrete doped with the admixture is the same as that of the common concrete in slump, expansion and the like. The concrete can meet the use requirements of concrete with different construction requirements, is suitable for large-scale popularization and application, and has remarkable economic and social benefits.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a coal gangue-based admixture and a preparation method thereof.
Background
The coal gangue contains a large amount of silicon-aluminum minerals, namely SiO2And Al2O3The contents of the waste water can reach 30-60% and 15-40% respectively, and the waste water is a resource for 'misplacing'. The coal gangue used as the concrete admixture can effectively reduce the stockpiling of the coal gangue on the one hand, and reduce the consumption of cement on the other hand, thereby realizing sustainable development. The activated coal gangue has good economic, social and environmental benefits when being applied to the engineering fields of construction, traffic and the like.
From the chemical composition, the coal gangue has high SiO2And Al2O3The low calcium composition of (A) and the high calcium composition of the portland cement clinker can form complementation, thereby effectively improving the performance of the portland cement. However, the use of the unactivated coal gangue which is not treated by any method as a concrete admixture directly brings adverse effects on the performance of concrete. The coal gangue has a porous structure, so when the coal gangue is used as an admixture, a part of mixing water can be absorbed, the working performance of concrete is affected, and negative effects on workability are generated; in addition, in order to increase the blending amount of the coal gangue and reduce the influence of the coal gangue on the mechanical property of the concrete, the activity of the coal gangue is also required to be further improved.
In the existing research on coal gangue-based admixtures, the coal gangue-based admixtures are mostly compounded with CaO, gypsum and the like, and the coal gangue-containing composite materials are calcined to improve the activity, for example, CN 102167532A (a method for preparing a concrete admixture by a concrete admixture and calcining coal gangue) proposes a process for mixing and calcining coal gangue, limestone, gypsum and fluorite to prepare a high-activity coal gangue composite admixture, but the preparation method has larger water demand. CN 106316178A (mineral admixture I-grade composite fly ash for concrete and manufacturing method thereof) is mixed and ground by using burnt-through coal gangue, blast furnace slag, converter slag and crushed silica, the prepared I-grade composite fly ash has low water demand but unknown activity, and the coal gangue accounts for a small proportion, thus having small contribution to the resource utilization of the coal gangue.
Disclosure of Invention
Aiming at the problems, the invention aims to provide the coal gangue-based admixture and the preparation method thereof.
The technical scheme of the invention is as follows:
on the one hand, the coal gangue-based admixture comprises the following components in percentage by mass: 80-90 parts of coal gangue, 5-15 parts of calcium oxide, 5-15 parts of gypsum, 3-6 parts of silane coupling agent, 15-20 parts of fly ash and 5-10 parts of limestone powder.
Preferably, the gypsum is one or more of anhydrous gypsum, hemihydrate gypsum, dihydrate gypsum, phosphogypsum and desulfurization gypsum.
Preferably, the silane coupling agent is one or more of isobutyl triethoxysilane, vinyl trimethoxysilane, aminopropyltriethoxysilane and propyltrimethoxysilane.
On the other hand, the preparation method of the coal gangue-based admixture comprises the following steps: the gangue-based admixture is prepared by pre-grinding gangue serving as a raw material into powder, then dry-mixing, wet-mixing, steaming and calcining 80-90 parts of gangue powder, 5-15 parts of calcium oxide and 5-15 parts of gypsum, then cooling a calcined product, then jointly grinding the cooled calcined product and 3-6 parts of silane coupling agent, and finally mixing the jointly ground product with 15-20 parts of fly ash and 5-10 parts of limestone powder to obtain the gangue-based admixture.
Preferably, when the gangue powder, the calcium oxide and the gypsum are wet-mixed, the wet-mixing is carried out for 5 to 20 minutes at a water-powder ratio of 0.1 to 0.25.
Preferably, the gangue powder is wet-mixed with the calcium oxide and the gypsum in the form of spray.
Preferably, the coal gangue powder, calcium oxide and gypsum are steamed at 70-90 ℃ for 4-8 hours.
Preferably, the coal gangue powder, calcium oxide and gypsum are calcined at the temperature of 600-900 ℃ for 1-4 hours.
Preferably, before the coal gangue powder, the calcium oxide and the gypsum are calcined, the steamed product is pelletized in a pelletizer, and then the pelletized mixture is calcined.
Preferably, the specific surface area of the coal gangue after pre-grinding is more than or equal to 200m2Per kg; the specific surface area of the product ground together with the silane coupling agent is more than or equal to 500m2Per kg; the specific surface area of the fly ash is more than or equal to 400m2/kg。
The invention has the beneficial effects that:
the invention mixes the coal gangue powder with calcium oxide and gypsum, carries out autoclaved curing in advance, can erode quartz and feldspar through hydrothermal alteration process, and the alkalinity of the calcium oxide can cause Al-O band fracture and Silicon (SiO) enrichment2·nH2O) is formed. The silane coupling agent is used for modifying the surface of the coal gangue after high-temperature calcination and activation, and the coal gangue is mixed with the fly ash and the limestone, so that the adverse effects of the coal gangue-based admixture on the workability of the concrete are eliminated by utilizing the modification of the silane coupling agent on the surface of the coal gangue and the ball effect, lubricity and particle accumulation effect of the fly ash and the limestone, the activity and the mixing amount of the coal gangue are improved, and the use of the concrete with different construction requirements can be met.
Detailed Description
The present invention will be further described with reference to the following examples.
It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Example 1
A preparation method of a coal gangue-based admixture comprises the following steps:
step 1: pre-grinding coal gangue, dry-mixing 80 parts of coal gangue powder, 5 parts of calcium oxide and 15 parts of gypsum for 20 minutes, and wet-mixing the powder for 20 minutes in a water-powder ratio of 0.15 by using tap water in a spraying manner; the mixed materials are steamed and cured for 8 hours at the temperature of 80 ℃, then taken out to be pelletized in a pelletizer, the spherical mixture is calcined for 4 hours at the temperature of 800 ℃, and taken out to be naturally cooled at room temperature.
Step 2: grinding the product obtained in the step 1 and 3 parts of silane coupling agent in a grinding machine for 25 minutes until the specific surface area reaches 600m2/kg。
And step 3: the product of step 2 is mixed with 15 parts of a mixture having a specific surface area of 400m2Per kg of fly ash and 5 parts of 700m specific surface area2And (3) carrying out dry mixing on/kg limestone powder for 20 minutes to obtain the coal gangue-based admixture.
Example 2
A preparation method of a coal gangue-based admixture comprises the following steps:
step 1: pre-grinding coal gangue, dry-mixing 80 parts of coal gangue powder, 5 parts of calcium oxide and 15 parts of gypsum for 5-20 minutes, and wet-mixing the powder for 20 minutes in a water-powder ratio of 0.15 by using tap water in a spraying manner; the mixed materials are steamed and cured for 8 hours at the temperature of 80 ℃, then taken out to be pelletized in a pelletizer, the spherical mixture is calcined for 4 hours at the temperature of 800 ℃, and taken out to be naturally cooled at room temperature.
Step 2: grinding the product obtained in the step 1 and 5 parts of silane coupling agent in a grinding machine for 30 minutes until the specific surface area reaches 650m2/kg。
And step 3: the product of step 2 is mixed with 20 parts of a mixture having a specific surface area of 500m2Per kg of fly ash and 10 parts of fly ash with a specific surface area of 800m2And (3) carrying out dry mixing on/kg limestone powder for 20 minutes to obtain the coal gangue-based admixture.
Example 3
Step 1: pre-grinding coal gangue, dry-mixing 80 parts of coal gangue powder, 5 parts of calcium oxide and 15 parts of gypsum for 5-20 minutes, and wet-mixing the powder for 20 minutes in a water-powder ratio of 0.15 by using tap water in a spraying manner; the mixed materials are steamed and cured for 8 hours at the temperature of 80 ℃, then taken out to be pelletized in a pelletizer, the spherical mixture is calcined for 4 hours at the temperature of 800 ℃, and taken out to be naturally cooled at room temperature.
Step 2: grinding the product obtained in the step 1 and 6 parts of silane coupling agent in a grinding machine for 25 minutes until the specific surface area reaches 600m2/kg；
And step 3: the product of step 2 is admixed with 20 parts of a specific surface area of 460m2Per kg of fly ash and 5 parts of 800m specific surface area2And (3) carrying out dry mixing on/kg limestone powder for 20 minutes to obtain the coal gangue-based admixture.
Test example
The gangue-based admixture prepared in the examples 1 to 3 was mixed into cement mortar by 30 parts by mass of a cementitious material, and fluidity and activity tests were performed. In addition, pure cement mortar is used as a blank group, gangue powder mortar without silane coupling agent, fly ash and limestone powder is used as a control group, and the test results of the groups are shown in table 1:
TABLE 1 Water requirement, fluidity ratio and Activity test results for coal gangue admixtures of each example
As can be seen from table 1, by using the embodiment of the present invention, the activity of the coal gangue powder can be improved, and the influence of the coal gangue powder on the fluidity of the cement mortar is improved by the modification of the surface of the coal gangue by the silane coupling agent, the ball effect, the lubricity and the particle stacking effect of the fly ash and the limestone.
It should be noted that, in addition to the above examples, the inventor also performed other examples of changing the amount of the components (e.g., end point values and intermediate values), changing the steam curing temperature, steam curing time, calcining temperature, calcining time, etc. by experimental design methods such as orthogonal experiments, etc., so that the obtained coal gangue-based admixture has better activity and fluidity, is improved compared with the control group, has no negative influence on the workability of concrete during implementation, and can meet the requirements of various field constructions on concrete.
It should be noted that, the steam cured product is pelletized in a pelletizer, and then the pelletized mixture is calcined, which can make the phases react better and more fully at high temperature, but this is not a necessary condition, and the gangue-based admixture can also be prepared by directly calcining after steam curing.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The coal gangue-based admixture is characterized by comprising the following components in percentage by mass: 80-90 parts of coal gangue, 5-15 parts of calcium oxide, 5-15 parts of gypsum, 3-6 parts of silane coupling agent, 15-20 parts of fly ash and 5-10 parts of limestone powder.
2. The gangue-based admixture as defined in claim 1, wherein the gypsum is one or more of anhydrite, hemihydrate gypsum, dihydrate gypsum, phosphogypsum and desulfurized gypsum.
3. The gangue-based admixture as defined in claim 1, wherein the silane coupling agent is one or more of isobutyltriethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, aminopropyltriethoxysilane, propyltrimethoxysilane.
4. The preparation method of the coal gangue-based admixture is characterized by comprising the following steps: the gangue-based admixture is prepared by pre-grinding gangue serving as a raw material into powder, then dry-mixing, wet-mixing, steaming and calcining 80-90 parts of gangue powder, 5-15 parts of calcium oxide and 5-15 parts of gypsum, then cooling a calcined product, then jointly grinding the cooled calcined product and 3-6 parts of silane coupling agent, and finally mixing the jointly ground product with 15-20 parts of fly ash and 5-10 parts of limestone powder to obtain the gangue-based admixture.
5. The method of claim 4, wherein the wet mixing of the gangue powder with the calcium oxide and gypsum is performed at a water-to-powder ratio of 0.1-0.25 for 5-20 minutes.
6. The method of claim 5, wherein the gangue powder is wet mixed with the calcium oxide and gypsum in the form of a spray.
7. The method of claim 4, wherein the gangue powder is steamed at 70-90 ℃ for 4-8 hours with calcium oxide and gypsum.
8. The method for preparing the gangue-based admixture as defined in claim 4, wherein the gangue powder, calcium oxide and gypsum are calcined at 600-900 ℃ for 1-4 hours.
9. The method of claim 4, wherein the steamed gangue powder is pelletized in a pelletizer before the gangue powder is calcined with calcium oxide and gypsum, and then the pelletized mixture is calcined.
10. The method for preparing the gangue-based admixture as defined in any one of claims 4 to 9, wherein the gangue has a pre-pulverized specific surface area of 200m or more2Per kg; the specific surface area of the product ground together with the silane coupling agent is more than or equal to 500m2Per kg; the specific surface area of the fly ash is more than or equal to 400m2/kg。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110017088.8A CN112745049A (en) | 2021-01-07 | 2021-01-07 | Coal gangue-based admixture and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110017088.8A CN112745049A (en) | 2021-01-07 | 2021-01-07 | Coal gangue-based admixture and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112745049A true CN112745049A (en) | 2021-05-04 |
Family
ID=75650074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110017088.8A Pending CN112745049A (en) | 2021-01-07 | 2021-01-07 | Coal gangue-based admixture and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112745049A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1546413A (en) * | 2003-12-01 | 2004-11-17 | 同济大学 | Booster for industrial waste residue coal gangue and method for preparing the same |
| CN102826771A (en) * | 2012-08-10 | 2012-12-19 | 梅州淦源建材科技有限公司 | Coal gangue activator, and novel clinker-free cementing material and preparation method thereof |
| US20140318420A1 (en) * | 2011-11-28 | 2014-10-30 | Zhengliang Qi | Process for calcining blending material with high activity by feeding outside kiln head and apparatus thereof |
| CN106348645A (en) * | 2016-08-22 | 2017-01-25 | 山东宏艺科技股份有限公司 | Additive for improving activity of thermal activated coal gangue |
| CN109485278A (en) * | 2018-12-13 | 2019-03-19 | 扬州大学 | A kind of cementitious material and preparation method thereof using coal gangue as raw material |
| CN110128075A (en) * | 2019-06-03 | 2019-08-16 | 青岛中建富兴商砼有限公司 | A kind of C30 tailing sand concrete and preparation method thereof |
| CN111548072A (en) * | 2020-05-30 | 2020-08-18 | 闫志伟 | High-strength high-performance concrete and preparation method thereof |
-
2021
- 2021-01-07 CN CN202110017088.8A patent/CN112745049A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1546413A (en) * | 2003-12-01 | 2004-11-17 | 同济大学 | Booster for industrial waste residue coal gangue and method for preparing the same |
| US20140318420A1 (en) * | 2011-11-28 | 2014-10-30 | Zhengliang Qi | Process for calcining blending material with high activity by feeding outside kiln head and apparatus thereof |
| CN102826771A (en) * | 2012-08-10 | 2012-12-19 | 梅州淦源建材科技有限公司 | Coal gangue activator, and novel clinker-free cementing material and preparation method thereof |
| CN106348645A (en) * | 2016-08-22 | 2017-01-25 | 山东宏艺科技股份有限公司 | Additive for improving activity of thermal activated coal gangue |
| CN109485278A (en) * | 2018-12-13 | 2019-03-19 | 扬州大学 | A kind of cementitious material and preparation method thereof using coal gangue as raw material |
| CN110128075A (en) * | 2019-06-03 | 2019-08-16 | 青岛中建富兴商砼有限公司 | A kind of C30 tailing sand concrete and preparation method thereof |
| CN111548072A (en) * | 2020-05-30 | 2020-08-18 | 闫志伟 | High-strength high-performance concrete and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 张蕾: "《固体废弃物处理与资源化利用》", 31 December 2017, 中国矿业大学出版社 * |
| 朱蕊等: "低烧煤矸石活性掺合料制备技术的试验研究", 《混凝土》 * |
| 武钦风: "《混凝土施工与检测关键技术》", 28 February 2015, 哈尔滨工业大学出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100455533C (en) | A novel masonry cement | |
| CN101671133B (en) | Modified low-alkalinity sulphoaluminate cement | |
| CN108675657B (en) | Method for preparing silicate-sulphoaluminate composite system clinker by using waste residues | |
| CN100357209C (en) | Belite-calcium barium sulphoaluminate cement | |
| CN101423355A (en) | Sulphoaluminates expansion agent prepared by industrial residue used in cement or concrete | |
| CN105565693B (en) | A kind of preparation method of gypsum composite gelled material | |
| CN102491717A (en) | Gypsum-base concrete with performances of sugaring resistance and carbonization resistance, and preparation method thereof | |
| CN112479609A (en) | All-solid-waste aluminum ferrite cement clinker for prefabricated parts and preparation method thereof | |
| CN110104984A (en) | A kind of ardealite slag cements early strength coagulant based on modified composite dewatering phase | |
| CN109369044A (en) | A kind of sulphate aluminium cement and preparation method thereof | |
| CN111747664A (en) | Semi-hydrated phosphogypsum-based water-resistant cementing material and preparation method thereof | |
| CN106698988B (en) | Carbonate rock modified phosphogypsum and preparation method thereof | |
| CN102838308A (en) | Expanded clinker as well as expansion agent and preparation method thereof | |
| EP3733628A1 (en) | Autoclaved cement compositions | |
| CN105481321A (en) | Modified gypsum base screed and preparation and application thereof | |
| CN103058542A (en) | Novel steel mineral powder composite admixture excitant, and preparation and use methods of same | |
| CN110255943B (en) | Wet-grinding barium slag admixture and preparation method and application thereof | |
| CN1092747A (en) | High-efficiency concrete expansion admixture and manufacture method thereof | |
| CN111875329A (en) | Plastering mortar prepared from phosphogypsum-based hydraulic composite cementing material and preparation thereof | |
| KR101664273B1 (en) | cement mortar compositon and cement mortar comprising the same, method thereof | |
| CN108585575B (en) | Cement retarder and preparation method and application thereof | |
| CN112645622A (en) | Preparation method of high-activity gangue admixture | |
| CN109265041A (en) | A kind of high activity slag powders and its preparation process | |
| CN112745049A (en) | Coal gangue-based admixture and preparation method thereof | |
| Pertiwi | Reliability of rice husk ash as substitution of Portland composite cement producing green concrete |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210504 |
|
| RJ01 | Rejection of invention patent application after publication |