CN110282888A - A kind of circulating fluid bed coal ash base supplementary cementitious material and its preparation method and application - Google Patents

A kind of circulating fluid bed coal ash base supplementary cementitious material and its preparation method and application Download PDF

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Publication number
CN110282888A
CN110282888A CN201910597401.2A CN201910597401A CN110282888A CN 110282888 A CN110282888 A CN 110282888A CN 201910597401 A CN201910597401 A CN 201910597401A CN 110282888 A CN110282888 A CN 110282888A
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CN
China
Prior art keywords
coal ash
cementitious material
fluid bed
circulating fluid
supplementary cementitious
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Withdrawn
Application number
CN201910597401.2A
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Chinese (zh)
Inventor
吴健
乔岗杰
尉万红
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SHANXI PINSHUO WASTE COAL POWER GENERATION Co Ltd
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SHANXI PINSHUO WASTE COAL POWER GENERATION Co Ltd
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Priority to CN201910597401.2A priority Critical patent/CN110282888A/en
Publication of CN110282888A publication Critical patent/CN110282888A/en
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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
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C04B7/28—Cements from oil shales, residues or waste other than slag from combustion residues, e.g. ashes or slags from waste incineration
    • 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)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Road Paving Structures (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The present invention relates to a kind of circulating fluid bed coal ash base supplementary cementitious material and its preparation method and application, that the purpose of the present invention is to solve the cement concrete early strengths of existing supplementary cementitious material preparation is low, shrinks the technical problems such as big, slump-loss, at high cost；The technical solution adopted by the present invention is that: a kind of circulating fluid bed coal ash base supplementary cementitious material comprises the following raw materials by weight percent: flyash 40~90%, clinker 5~50% and grain slag 2~10%；Al in the flyash2O3>=30%, f-CaO≤2%, SO3≤ 3%；Circulating fluid bed coal ash base supplementary cementitious material large specific surface area produced by the present invention, activity index are high, it can be used for making cement, or replacing partial cement prepares strong concrete, be conducive to improve the workability and durability of concrete, improve the intensity and seepage-resistant grade of concrete, with good workability, while the use of clinker is reduced, and then reduces carbon emission.

Description

A kind of circulating fluid bed coal ash base supplementary cementitious material and its preparation method and application
Technical field
The invention belongs to field of cementing material technology, and in particular to a kind of circulating fluid bed coal ash base supplementary cementitious material And its preparation method and application.
Background technique
With the development of cement, concrete technology, the effect that supplementary cementitious material plays becomes more and more important, not only can generation Cement is prepared for part clinker, part of cement can also be replaced to be used for the production of concrete.
Currently, common supplementary cementitious material mainly has silicon ash, lime stone, slag, flyash etc..Single auxiliary gelling Material has certain problems in application, such as because volcanic ash activity of coal ash effect is poor, causes the cement of adding coal ash mixed Solidifying soil material early strength is low, and the performance of chloride-penetration resistance, anti-carbonation and anti-early-age shrinkage declines；Add the cement of slag Concrete material shrinks larger；The surface area of silicon ash is larger, and water requirement is high, need to match with water-reducing agent when applied in cement concrete It closes and uses, increase cost, and the loss of concrete slump can be caused to a certain extent.
While the fields such as electric power, metallurgy rapidly develop in China, a large amount of flyash, clinker, grain slag etc. one is produced As industrial solid castoff.In recent years, circulating fluidized bed boiler generation technology is because such as gangue, wind oxidized coal can be used in it Equal wastes or inferior fuel are widely used, but the flyash that generates of its power generation and clinker this 2 kinds of solid waste amounts are significantly larger than The solid waste amount that same size coal-powder boiler generation technology generates.Further, since boiler hearth of circulating fluidized bed internal temperature is lower, adopt With limestone desulfurization is sprayed into furnace, cause to restrict it in building materials there are a certain amount of free calcium oxide in flyash and clinker Direct utilization in field causes it lower using level, it would be highly desirable to open up scale, resource utilization approach.
The stockpiling of the industrial solid castoffs such as circulating fluid bed coal ash and clinker and grain slag brings serious environment Pollution problem restricts economic sustainable development.Therefore, the resource utilization of solid waste, which becomes, needs urgent solution Problem.
Summary of the invention
Low, receipts that the purpose of the present invention is to solve the cement concrete early strengths of existing supplementary cementitious material preparation Contracting is big, slump-loss, it is at high cost the problems such as, while solving circulating fluid bed coal ash directly application be limited in construction material The problem of, a kind of energy saving, small circulating fluid bed coal ash Kiev low with production cost of environmental pollution is provided and helps gelling material Material and its preparation method and application.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of circulating fluid bed coal ash base supplementary cementitious material, comprises the following raw materials by weight percent: flyash 40~90%, clinker 5~50% and grain slag 2~10%；
The flyash and clinker is the solid waste that circulating fluidized bed boiler power generation generates, and the grain slag is blast furnace Generated fusant when manUfaCtUre of pig iron, the solid waste formed through water quenching；Al in the flyash2O3>=30%, f- CaO≤2%, SO3≤ 3%.
Further, the specific surface area of the circulating fluid bed coal ash base supplementary cementitious material is 650~710m2/ Kg, 45 μm tail over≤8%.
Further, the activity index of the circulating fluid bed coal ash base supplementary cementitious material is not less than 65%.
The preparation method of above-mentioned circulating fluid bed coal ash base supplementary cementitious material, comprising the following steps: by weight percent 25~45min of grinding is cooperateed with through ball mill than flyash, 5~50% clinker and 2~10% grain slag for 40~90%, from And circulating fluid bed coal ash base supplementary cementitious material is made.
The application of above-mentioned circulating fluid bed coal ash base supplementary cementitious material, described circulating fluid bed coal ash Kiev help glue Gel material is used to prepare 42.5 cement.
The application of above-mentioned circulating fluid bed coal ash base supplementary cementitious material, described circulating fluid bed coal ash Kiev help glue Gel material is used to prepare C40 concrete.
The beneficial effects of the present invention are:
1, the present invention uses the industrial solid castoffs such as circulating fluid bed coal ash and clinker, grain slag for raw material, produces work Skill is simple, low production cost, energy consumption are small, economic and environment-friendly, it can be achieved that scale utilizes, while solving recirculating fluidized bed fine coal Ash, clinker and the intractable status of grain slag, realize the effective use of solid waste resource, turn waste into wealth, at the same solve its stockpiling with And the problems such as land occupation.
2, circulating fluid bed coal ash base supplementary cementitious material produced by the present invention, large specific surface area, activity index is high, can Strong concrete is prepared for making cement or replacing partial cement, is conducive to the workability and durability that improve concrete, The intensity and seepage-resistant grade of concrete are improved, there is good workability, while reducing the use of clinker, and then is reduced Carbon emission.
3, circulating fluid bed coal ash base supplementary cementitious material produced by the present invention is applied to Shi Buxu in cement concrete It to be used cooperatively with water-reducing agent, production cost can be reduced.
Specific embodiment
The present invention is described in further details below with reference to embodiment.
Embodiment 1
One of the present embodiment circulating fluid bed coal ash base supplementary cementitious material, by the raw material of following weight percent Composition: flyash 40~90%, clinker 5~50% and grain slag 2~10%；
The flyash and clinker is the solid waste that circulating fluidized bed boiler power generation generates, and the grain slag is blast furnace Generated fusant when manUfaCtUre of pig iron, the solid waste formed through water quenching；Al in the flyash2O3>=30%, f- CaO≤2%, SO3≤ 3%.
The specific surface area of the circulating fluid bed coal ash base supplementary cementitious material is 650~710m2/ kg, 45 μm of sieves Remaining≤8%, activity index is not less than 65%.
The preparation method of above-mentioned circulating fluid bed coal ash base supplementary cementitious material, comprising the following steps: by weight percent 25~45min of grinding is cooperateed with through ball mill than flyash, 5~50% clinker and 2~10% grain slag for 40~90%, from And circulating fluid bed coal ash base supplementary cementitious material is made.
Embodiment 2
One of the present embodiment circulating fluid bed coal ash base supplementary cementitious material, by the raw material of following weight percent Composition: flyash 40%, clinker 50% and grain slag 10%；Al in the flyash2O3Content be 35%, f-CaO content be 1.5%, SO3Content is 2.8%.
The preparation method of above-mentioned circulating fluid bed coal ash base supplementary cementitious material comprising the following steps: will be described heavy Flyash, clinker and the grain slag for measuring percentage cooperate with grinding 45min through ball mill, so that circulating fluid bed coal ash Kiev be made Help cementitious material.
The performance of circulating fluid bed coal ash base supplementary cementitious material made from the present embodiment are as follows: moisture content 1.0% needs Water ratio is 104%, 3 days, 7 days, 28 days activity indexs be respectively 65%, 87%, 94%, specific surface area 650m2/ kg, It is 8% that 45 μm, which tail over,.
Circulating fluid bed coal ash base supplementary cementitious material made from the present embodiment is used to prepare 42.5 cement, and incorporation is When 40%, obtained cement normal consistency water consumption is 135ml, presetting period 160min, final setting time 270min；3d intensity Up to 26.9MPa, 28d intensity reaches 48.8MPa.
The cement of the substitution of circulating fluid bed coal ash base supplementary cementitious material made from the present embodiment 35% prepares C40 coagulation Soil, concrete workability can be good, and 7 days and 28 days intensity are respectively 42.5MPa, 60.4MPa, and seepage-resistant grade is up to P12.
Embodiment 3
One of the present embodiment circulating fluid bed coal ash base supplementary cementitious material, by the raw material of following weight percent Composition: flyash 90%, clinker 5% and grain slag 5%；Wherein, Al in flyash2O3Content be 34%, f-CaO content be 1.6%, SO3Content is 2.6%.
The preparation method of above-mentioned circulating fluid bed coal ash base supplementary cementitious material, comprising the following steps: by the weight Flyash, clinker and the grain slag of percentage cooperate with grinding 25min through ball mill, help so that circulating fluid bed coal ash Kiev be made Cementitious material.
The performance of circulating fluid bed coal ash base supplementary cementitious material made from the present embodiment are as follows: moisture content 1.0% needs Water ratio is 98.5%, 3 days, 7 days, 28 days activity indexs be respectively 63%, 85%, 103%, specific surface area 700m2/ Kg, it is 4.6% that 45 μm, which tail over,.
Circulating fluid bed coal ash base supplementary cementitious material made from the present embodiment is used to prepare 42.5 cement, and incorporation is When 40%, consumptive use of water normal consistence 136ml, pre-hardening used time 120min, final set used time 278min；3d intensity reaches 27.3MPa, 28d intensity reaches 50.3MPa.
The cement of the substitution of circulating fluid bed coal ash base supplementary cementitious material made from the present embodiment 35% prepares C40 coagulation Soil, concrete workability can be good, and 7 days and 28 days intensity are respectively 42.7MPa, 61.2MPa, and seepage-resistant grade is up to P12.
Embodiment 4
One of the present embodiment circulating fluid bed coal ash base supplementary cementitious material, by the raw material of following weight percent Composition: flyash 75%, clinker 23% and grain slag 2%；Wherein, Al in flyash2O3Content be 35%, f-CaO content be 1.5%, SO3Content is 2.8%.
The preparation method of above-mentioned circulating fluid bed coal ash base supplementary cementitious material comprising the following steps: will be described heavy Flyash, clinker and the grain slag for measuring percentage cooperate with grinding 30min through ball mill in proportion, so that recirculating fluidized bed fine coal be made Grey base supplementary cementitious material.
The performance of circulating fluid bed coal ash base supplementary cementitious material made from the present embodiment are as follows: moisture content 1.0% needs Water ratio is 100%, 3 days, 7 days, 28 days activity indexs be respectively 68%, 88%, 101%, specific surface area 686m2/ kg, It is 6% that 45 μm, which tail over,.
Circulating fluid bed coal ash base supplementary cementitious material made from the present embodiment is used to prepare 42.5 cement, and incorporation is When 40%, consumptive use of water normal consistence 138ml, pre-hardening used time 129min, final set used time 293min；3d intensity reaches 26.7MPa, 28d intensity reaches 49.8MPa；
The cement of the substitution of circulating fluid bed coal ash base supplementary cementitious material made from the present embodiment 35% prepares C40 coagulation Soil, concrete workability can be good, and 7 days and 28 days intensity are respectively 42.6MPa, 60.3MPa, and seepage-resistant grade is up to P12.
Embodiment 5
One of the present embodiment circulating fluid bed coal ash base supplementary cementitious material, by the raw material of following weight percent Composition: flyash 55%, clinker 38% and grain slag 7%；Wherein, Al in flyash2O3Content is that 34%, f-CaO content is 1.4%, SO3Content is 2.6%.
The preparation method of above-mentioned circulating fluid bed coal ash base supplementary cementitious material comprising the following steps: will be described heavy Flyash, clinker and the grain slag for measuring percentage cooperate with grinding 35min through ball mill in proportion, so that recirculating fluidized bed fine coal be made Grey base supplementary cementitious material.
The performance of circulating fluid bed coal ash base supplementary cementitious material made from the present embodiment are as follows: moisture content 1.0% needs Water ratio is 99.5%, 3 days, 7 days, 28 days activity indexs be respectively 66%, 85%, 104%, specific surface area 710m2/ Kg, it is 3.5% that 45 μm, which tail over,.
Circulating fluid bed coal ash base supplementary cementitious material made from the present embodiment substitutes 40% clinker and prepares 42.5 cement, Consumptive use of water normal consistence is 135ml, pre-hardening used time 120min, final set used time 285min；3d intensity reaches 27.5MPa, and 28d intensity reaches 50.1MPa；The cement of substitution 35% prepares C40 concrete, and concrete workability can be good, and 7 days and 28 days intensity are respectively 42.8MPa, 60.8MPa, seepage-resistant grade reach P12.
Above-mentioned circulating fluid bed coal ash base supplementary cementitious material can also be used to prepare light-weight building material.
The weight percent of flyash of the invention, clinker and grain slag can also be: 40~90wt% of flyash, clinker 5 Any combination selects in 2~10wt% of~50wt% and grain slag, and protection scope is not restricted to the described embodiments.

Claims (6)

1. a kind of circulating fluid bed coal ash base supplementary cementitious material, which is characterized in that by the raw material group of following weight percent At: flyash 40~90%, clinker 5~50% and grain slag 2~10%；
The flyash and clinker is the solid waste that circulating fluidized bed boiler power generation generates, and the grain slag is blast furnace process Generated fusant when the pig iron, the solid waste formed through water quenching；Al in the flyash2O3>=30%, f-CaO ≤ 2%, SO3≤ 3%.
2. a kind of circulating fluid bed coal ash base supplementary cementitious material according to claim 1, it is characterised in that: described The specific surface area of circulating fluid bed coal ash base supplementary cementitious material is 650~710m2/ kg, 45 μm tail over≤8%.
3. a kind of circulating fluid bed coal ash base supplementary cementitious material according to claim 1, it is characterised in that: described The activity index of circulating fluid bed coal ash base supplementary cementitious material is not less than 65%.
4. a kind of preparation method of circulating fluid bed coal ash base supplementary cementitious material, feature described in claim 1-3 exist In, comprising the following steps: by weight percent be 40~90% flyash, 5~50% clinker and 2~10% grain slag pass through Ball mill cooperates with 25~45min of grinding, so that circulating fluid bed coal ash base supplementary cementitious material be made.
5. a kind of application of circulating fluid bed coal ash base supplementary cementitious material described in claim 1-3, it is characterised in that: institute It states circulating fluid bed coal ash base supplementary cementitious material and is used to prepare 42.5 cement.
6. a kind of application of circulating fluid bed coal ash base supplementary cementitious material described in claim 1-3, it is characterised in that: institute It states circulating fluid bed coal ash base supplementary cementitious material and is used to prepare C40 concrete.
CN201910597401.2A 2019-07-04 2019-07-04 A kind of circulating fluid bed coal ash base supplementary cementitious material and its preparation method and application Withdrawn CN110282888A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111548034A (en) * 2020-06-19 2020-08-18 中山大学 Auxiliary cementing material utilizing circulating fluidized bed fly ash and preparation method thereof
CN113880467A (en) * 2021-11-18 2022-01-04 北京科技大学 Modified circulating fluidized bed fly ash-based cementing material and preparation method thereof
CN114538808A (en) * 2022-03-14 2022-05-27 北京科技大学 Circulating fluidized bed fly ash-based low-carbon cement and preparation method thereof

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CN107344832A (en) * 2017-06-29 2017-11-14 中国矿业大学 A kind of concrete based on slag agstone supplementary cementitious material
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111548034A (en) * 2020-06-19 2020-08-18 中山大学 Auxiliary cementing material utilizing circulating fluidized bed fly ash and preparation method thereof
CN113880467A (en) * 2021-11-18 2022-01-04 北京科技大学 Modified circulating fluidized bed fly ash-based cementing material and preparation method thereof
CN113880467B (en) * 2021-11-18 2022-06-03 北京科技大学 Modified circulating fluidized bed fly ash-based cementing material and preparation method thereof
CN114538808A (en) * 2022-03-14 2022-05-27 北京科技大学 Circulating fluidized bed fly ash-based low-carbon cement and preparation method thereof

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Application publication date: 20190927