CN111847919A - Preparation method of high-performance cement - Google Patents
Preparation method of high-performance cement Download PDFInfo
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- CN111847919A CN111847919A CN202010698435.3A CN202010698435A CN111847919A CN 111847919 A CN111847919 A CN 111847919A CN 202010698435 A CN202010698435 A CN 202010698435A CN 111847919 A CN111847919 A CN 111847919A
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- China
- Prior art keywords
- cement
- powder
- clinker
- composite powder
- mass ratio
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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
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
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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
- C04B7/24—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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A high-performance cement preparation method comprises the following steps of a, mixing and grinding 89% of clinker, 6% of stone powder and 5% of desulfurized gypsum according to the mass ratio to obtain clinker powder, respectively grinding the clinker powder into different fineness by adopting a production process of respectively grinding and then blending the clinker powder based on the characteristics of different grindability of different raw materials, and then blending and uniformly mixing the clinker powder according to a certain proportion. Meanwhile, resources are reasonably utilized, and the industrial waste residue powder, the fly ash and the desulfurized gypsum are used, so that waste is changed into valuable, the production cost is reduced, and the environment protection is facilitated.
Description
Technical Field
The invention relates to the technical field of cement production, in particular to a preparation method of high-performance cement.
Background
The cement produced by the traditional cement grinding mode adopts mixed grinding: the clinker, gypsum, slag or fly ash and other materials are measured according to a certain proportion and conveyed by a belt to enter a tube mill for mixing and grinding. Because the grindability of different materials is different, after the materials with poor grindability are ground to the fineness requirement, the materials with good grindability are over-ground, the grindability of clinker is better than that of slag, after the materials are mixed and ground together, the over-fine particles are clinker powder, the coarse particles are slag, and cement particles are distributed and concentrated, so that the void ratio of particle accumulation is increased, a large amount of free water is needed for filling, and the physical water demand is increased; on the other hand, as the active ingredient clinker in the fine particles is more, the clinker fine powder of <3um is hydrated when meeting water, the initial hydration of the cement is fast, the chemical water demand is increased, and the clinker fine powder of <3um influences the adaptability of the cement and the water reducer, so that the hydration heat is high, the water consumption of the standard consistency of the cement is large due to the increase of the physical water demand and the chemical water demand, the setting time is long, and the compatibility with the water reducer is poor; in addition, the coarse-grained slag has the activity which cannot be expected in the later period of cement production, so that the 28-day strength is low. Namely, the cement produced by the traditional cement grinding mode can not meet the index requirement of high-performance cement, so a high-performance cement preparation method is provided for solving the problems.
Disclosure of Invention
In view of the above situation, the present invention provides a method for preparing high performance cement to overcome the drawbacks of the prior art.
In order to achieve the purpose, the invention provides a preparation method of high-performance cement, which comprises the following steps:
a, mixing and grinding 89% of clinker, 6% of stone powder and 5% of desulfurized gypsum according to the mass ratio to obtain clinker powder;
b, mixing and grinding 85% of slag, 12% of stone powder and 3% of desulfurized gypsum according to the mass ratio to obtain slag composite powder;
c, mixing and grinding 70% of stone powder, 12% of volcanic ash, 12% of wet fly ash and 6% of desulfurized gypsum according to the mass ratio to obtain fly ash composite powder;
and (3) taking the clinker powder, the slag composite powder and the fly ash composite powder in different proportions, and fully mixing the clinker powder, the slag composite powder and the fly ash composite powder by a double-shaft stirring and uniformly mixing machine to prepare different varieties of cement with different grades.
And uniformly mixing 85% of the clinker powder and 15% of the slag composite powder according to the mass ratio to obtain the PO42.5 cement.
And uniformly mixing 75% of the clinker powder and 25% of the slag composite powder according to the mass ratio to obtain the PSA42.5 cement.
And uniformly mixing 52% of clinker powder and 48% of slag composite powder according to the mass ratio to obtain the PSA32.5 cement.
And uniformly mixing 70% of the clinker powder, 12% of the slag composite powder and 18% of the fly ash composite powder according to the mass ratio to obtain the PC42.5 cement.
And uniformly mixing 52% of clinker powder, 12% of slag composite powder and 36% of fly ash composite powder according to the mass ratio to obtain the M32.5 cement.
And analyzing the diameter of the particles in the cement by using a laser particle size analyzer to ensure that the content of the particles with the diameter smaller than 3um is between 13 and 17 percent and the content of the particles with the diameter larger than 3 to 32um is larger than 70 percent.
And detecting the net slurry fluidity of the cement every hour, wherein the control value is more than 285 mm.
And (3) periodically detecting the hydration heat of the cement, and controlling the hydration heat value to be not more than 230J/g in 3 days and not more than 300J/g in 7 days.
Has the advantages that:
the invention adopts the production process of respectively grinding and then blending, which is based on the characteristics of different raw materials with different grindability, respectively grinding into different fineness, and then blending and mixing according to a certain proportion. The cement prepared in the way has the characteristics of reasonable particle distribution, low water consumption for standard consistency, low heat of hydration, good adaptability with a water reducing agent, moderate early strength, high 28-day strength, low leaving-factory cement temperature and stable quality. Meanwhile, resources are reasonably utilized, and the industrial waste residue powder, the fly ash and the desulfurized gypsum are used, so that waste is changed into valuable, the production cost is reduced, and the environment protection is facilitated.
Detailed Description
The invention relates to a preparation method of high-performance cement, which comprises the following steps:
a, mixing and grinding 89% of clinker, 6% of stone powder and 5% of desulfurized gypsum according to the mass ratio to obtain clinker powder;
b, mixing and grinding 85% of slag, 12% of stone powder and 3% of desulfurized gypsum according to the mass ratio to obtain slag composite powder;
c, mixing and grinding 70% of stone powder, 12% of volcanic ash, 12% of wet fly ash and 6% of desulfurized gypsum according to the mass ratio to obtain fly ash composite powder;
and (3) taking the clinker powder, the slag composite powder and the fly ash composite powder in different proportions, and fully mixing the clinker powder, the slag composite powder and the fly ash composite powder by a double-shaft stirring and uniformly mixing machine to prepare different varieties of cement with different grades.
In the first embodiment, 85% of clinker powder and 15% of slag composite powder are uniformly mixed according to the mass ratio to obtain PO42.5 cement.
In example two, 75% of the clinker powder and 25% of the slag composite powder are mixed by mass to obtain PSA42.5 cement.
In the third embodiment, 52% of clinker powder and 48% of slag composite powder are uniformly mixed according to the mass ratio to obtain the PSA32.5 cement.
In the fourth embodiment, 70% of the clinker powder, 12% of the slag composite powder and 18% of the fly ash composite powder are uniformly mixed according to the mass ratio to obtain the PC42.5 cement.
In the fifth embodiment, 52% of clinker powder, 12% of slag composite powder and 36% of fly ash composite powder are uniformly mixed according to the mass ratio to obtain the M32.5 cement.
The hydration heat of the cement is regularly detected, the hydration heat value is controlled to be not more than 230J/g in 3 days and not more than 300J/g in 7 days, the hydration heat in 3 days is probably about 230J/g for ordinary PO42.5 cement, but is lower than 230J/g and even lower than 200J/g for moderate-heat and low-heat 42.5 cement, and the hydration heat of the ordinary PO42.5 cement in 7 days is more than 300J/g.
The particle size distribution of the cement is detected by a laser particle size analyzer, and the particle size and the components in the particles are adjusted. The data detected by the laser particle size analyzer comprise the percentage content of each particle size, the operation condition of the mill can be fully reflected, and the parameters of the mill, such as the rotating speed, the air volume, the cyclic load and the like, can be adjusted in time according to the detection result of the laser particle size analyzer and the content of components in the particles, so that the particle distribution and the components of the cement can be adjusted.
The diameter of the particles in the cement is analyzed by a laser particle size analyzer, the content of the particles with the diameter smaller than 3um is 13-17%, the content of the particles with the diameter larger than 3-32um is larger than 70%, the optimal particle distribution is that the size of the cement particles is continuously distributed in a certain range, namely, gaps among large particles are filled by small particles, gaps among small particles are filled by fine particles, and gaps among fine particles are filled by fine particles, so that the closest packing can be achieved in slurry, the corresponding concrete performance can be ensured to be good, namely, the mechanical property of the cement can be more fully exerted, and the compatibility with a water reducing agent is also good. The content of 3um smaller than the diameter of cement particles is controlled to be 13-17%, the content of cement particles larger than 3-32um is controlled to be more than 70%, so that the particles in the cement are distributed and widened, and the fine stone powder particles, clinker powder and slag powder particles form a closest accumulation, thereby remarkably improving the compactness of the cement stone, improving the pore structure of the cement stone and further improving the permeability resistance, chloride ion permeation resistance and sulfate corrosion resistance of the concrete.
The fluidity of the cement paste is detected every hour, the control value is larger than 285mm, and the adjustment is carried out in time when the control value is lower than the target value, so that the adaptability of the cement and the water reducing agent is well ensured, and the detection of the fluidity of the cement paste is the prior art and is not repeated herein.
The optimal particle distribution is that the cement particle composition is continuously distributed in a certain range, namely, the gaps among large particles are filled by small particles, the gaps among small particles are filled by fine particles, and the gaps among fine particles are filled by fine particles, so that the closest packing can be achieved in slurry, the corresponding concrete performance can be ensured to be good, namely, the mechanical property of the cement can be more fully exerted, and the compatibility with the water reducing agent is also good. The cement prepared in the way has the characteristics of reasonable particle distribution, low water consumption for standard consistency, low heat of hydration, good adaptability with a water reducing agent, moderate early strength, high 28-day strength, low leaving-factory cement temperature and stable quality. Meanwhile, resources are reasonably utilized, and the industrial waste residue powder, the volcanic ash, the fly ash and the desulfurized gypsum are used, so that waste is changed into valuable, the production cost is reduced, and the environment protection is facilitated.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The preparation method of the high-performance cement is characterized by comprising the following steps of:
a, mixing and grinding 89% of clinker, 6% of stone powder and 5% of desulfurized gypsum according to the mass ratio to obtain clinker powder;
b, mixing and grinding 85% of slag, 12% of stone powder and 3% of desulfurized gypsum according to the mass ratio to obtain slag composite powder;
c, mixing and grinding 70% of stone powder, 12% of volcanic ash, 12% of wet fly ash and 6% of desulfurized gypsum according to the mass ratio to obtain fly ash composite powder;
and (3) taking the clinker powder, the slag composite powder and the fly ash composite powder in different proportions, and fully mixing the clinker powder, the slag composite powder and the fly ash composite powder by a double-shaft stirring and uniformly mixing machine to prepare different varieties of cement with different grades.
2. The method for preparing cement according to claim 1, wherein 85% of clinker powder and 15% of slag composite powder are uniformly mixed by mass ratio to obtain PO42.5 cement.
3. The method for preparing high-performance cement according to claim 1, wherein 75% of clinker powder and 25% of slag composite powder are uniformly mixed by mass to obtain PSA42.5 cement.
4. The method for preparing high-performance cement according to claim 1, wherein 52% of clinker powder and 48% of slag composite powder are uniformly mixed by mass ratio to obtain the PSA32.5 cement.
5. The method for preparing high-performance cement according to claim 1, wherein 70% of clinker powder, 12% of slag composite powder and 18% of fly ash composite powder are uniformly mixed according to the mass ratio to obtain PC42.5 cement.
6. The method for preparing high-performance cement according to claim 1, wherein the M32.5 cement is obtained by uniformly mixing 52% of clinker powder, 12% of slag composite powder and 36% of fly ash composite powder according to the mass ratio.
7. A method as claimed in any one of claims 2 to 6, wherein the diameter of the particles in the cement is analyzed by a laser particle size analyzer to obtain a particle diameter of less than 3um in the range of 13% to 17% and a particle diameter of greater than 3 to 32um in the range of greater than 70%.
8. A method for producing high performance cement according to any one of claims 2-6, characterized in that the net slurry fluidity of the cement is measured every hour with a control value of more than 285 mm.
9. A method for preparing high-performance cement according to any one of claims 2 to 6, wherein the hydration heat of said cement is periodically measured, and the hydration heat value is controlled to be not more than 230J/g in 3 days and not more than 300J/g in 7 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010698435.3A CN111847919A (en) | 2020-07-20 | 2020-07-20 | Preparation method of high-performance cement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010698435.3A CN111847919A (en) | 2020-07-20 | 2020-07-20 | Preparation method of high-performance cement |
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| CN111847919A true CN111847919A (en) | 2020-10-30 |
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| CN202010698435.3A Pending CN111847919A (en) | 2020-07-20 | 2020-07-20 | Preparation method of high-performance cement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113386246A (en) * | 2021-06-25 | 2021-09-14 | 洛阳理工学院 | Preparation and forming process of high-strength and high-durability cement-based material |
Citations (4)
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|---|---|---|---|---|
| JP2007145624A (en) * | 2005-11-25 | 2007-06-14 | Matsushita Electric Works Ltd | Method of producing cement |
| CN102070306A (en) * | 2010-04-23 | 2011-05-25 | 赵明友 | Production process of special low-carbon steel slag cement |
| CN103304164A (en) * | 2013-06-24 | 2013-09-18 | 天津山水水泥有限公司 | Novel Portland slag P.SA32.5 cement |
| CN109503005A (en) * | 2018-12-29 | 2019-03-22 | 山东永正水泥有限公司 | A kind of PSA grades of slow setting cement and preparation method thereof and concrete road |
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2020
- 2020-07-20 CN CN202010698435.3A patent/CN111847919A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007145624A (en) * | 2005-11-25 | 2007-06-14 | Matsushita Electric Works Ltd | Method of producing cement |
| CN102070306A (en) * | 2010-04-23 | 2011-05-25 | 赵明友 | Production process of special low-carbon steel slag cement |
| CN103304164A (en) * | 2013-06-24 | 2013-09-18 | 天津山水水泥有限公司 | Novel Portland slag P.SA32.5 cement |
| CN109503005A (en) * | 2018-12-29 | 2019-03-22 | 山东永正水泥有限公司 | A kind of PSA grades of slow setting cement and preparation method thereof and concrete road |
Non-Patent Citations (3)
| Title |
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| 刘秋美: "《土木工程材料》", 31 January 2019, 西南交通大学出版社 * |
| 林宗寿: "《矿渣基生态水泥》", 31 May 2018, 中国建材工业出版社 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113386246A (en) * | 2021-06-25 | 2021-09-14 | 洛阳理工学院 | Preparation and forming process of high-strength and high-durability cement-based material |
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Application publication date: 20201030 |