CN112209640A - Method for controlling setting time of cement produced by desulfurized gypsum - Google Patents
Method for controlling setting time of cement produced by desulfurized gypsum Download PDFInfo
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- CN112209640A CN112209640A CN202010928651.2A CN202010928651A CN112209640A CN 112209640 A CN112209640 A CN 112209640A CN 202010928651 A CN202010928651 A CN 202010928651A CN 112209640 A CN112209640 A CN 112209640A
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- cement
- desulfurized gypsum
- controlling
- setting time
- setting
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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
-
- 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
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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
- C04B7/17—Mixtures thereof with other inorganic cementitious materials or other activators with calcium oxide containing activators
- C04B7/19—Portland cements
-
- 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
- C04B7/36—Manufacture of hydraulic cements in general
-
- 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
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
- C04B7/52—Grinding ; After-treatment of ground cement
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
-
- 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
Abstract
The invention discloses a method for controlling the setting time of cement generated by desulfurized gypsum, wherein the cement comprises the following raw materials in percentage: 70-75% of clinker, 10-12% of limestone waste residue, 7-10% of steel powder slag, 4-5% of coal gangue, 3-8% of phosphogypsum and 0.4-5% of desulfurized gypsum. The cement generated by the desulfurized gypsum prepared by the invention can control the initial setting time by adjusting the adding proportion of the desulfurized gypsum; the cement generated by using the desulfurized gypsum slows down the evaporation speed of water in concrete, reduces the solidification speed of the concrete, ensures the forming effect and quality of the concrete, and simultaneously improves the stability, permeability resistance and crack resistance of the cement paste; the cement mixture generated by the desulfurized gypsum obtained by the process has uniform particle size, and is beneficial to improving the compactness of concrete and improving the strength of the concrete; the process for producing cement changes the desulfurized gypsum generated by power plants and the like into valuable, finds a new material for adjusting the cement setting time, and solves the problem of waste treatment of the power plants.
Description
Technical Field
The invention relates to the technical field of cement production, in particular to a method for controlling the setting time of cement produced by desulfurized gypsum.
Background
The cement is a common building raw material, is a powdery hydraulic inorganic cementing material, is added with water and stirred to form slurry, can be hardened in the air or better in water, and can firmly bond materials such as sand, stone and the like together. Along with the continuous enhancement of the comprehensive national power of China, the strength of the nation to public infrastructure is continuously increased in the year, and different types of cement are developed in order to adapt to construction conditions under different working conditions. The road cement is a special cement prepared by grinding limestone clinker of road, a certain amount of mixed material and a proper amount of gypsum, and is mainly applied to the road engineering of runways, urban and rural highways and the like. In the process of road construction, because the time periods of construction stirring, paving, compacting and the like are long, the work is not completed, and cement is solidified to cause the quality of the paved road to be reduced.
The desulfurized gypsum is an industrial byproduct gypsum generated by the reaction of SO2 and CaCO3 during the desulfurization of flue gas of a thermal power plant, and has the main components of calcium sulfate dihydrate and some impurities. The components of the desulfurized gypsum are similar to those of natural gypsum, and a large number of practical researches show that the desulfurized gypsum can also meet the requirements of related performance indexes when used for producing cement by replacing the natural gypsum with the desulfurized gypsum. The desulfurized gypsum reacts with hydrated calcium aluminate to generate hydrated calcium sulphoaluminate needle crystals (ettringite). The crystal is insoluble, and is coated on the surface of cement clinker to form a protective film and a barrierPrevent water from entering the interior of cement and delay hydration reaction so as to prevent flash coagulation phenomenon produced by hydration of pure cement clinker. Furthermore, the desulfurized gypsum can promote the hydration of tricalcium silicate and dicalcium silicate minerals in the cement, thereby improving the early strength of the cement and balancing the strength of the cement at all ages. The desulfurized gypsum contains part of unreacted CaCO3And partially soluble K, Na salts, the presence of which can promote the hydration of cement and trigger the full exertion of the activity of cement admixtures or concrete admixtures. Therefore, a method for controlling the setting time of cement by using desulfurized gypsum as a retarder is urgently needed to be researched so as to meet the production requirement of the conventional anticoagulant cement.
Disclosure of Invention
Based on the technical problems in the prior art, the method for controlling the setting time of cement produced by desulfurized gypsum is disclosed.
The method for controlling the setting time of cement produced by desulfurized gypsum can control the setting time of cement by adjusting the addition amount of desulfurized gypsum, and the cement obtained by processing not only prolongs the initial setting time, but also enhances the compressive strength and the flexural strength.
The purpose of the invention is realized by the following technical scheme: the method for controlling the setting time of cement produced by desulfurized gypsum comprises the following steps:
the production method of the retarded cement comprises the following steps:
step one, preparing clinker, namely putting 70-80% of limestone, 8-10% of carbonaceous shale and 5-15% of iron raw materials into a preparation chamber to prepare cement clinker.
Step two, preparing a mixture, namely transferring the clinker obtained in the step one to a stirrer, adding corresponding auxiliary materials, uniformly stirring the auxiliary materials including limestone waste residues, steel powder residues and coal gangue to obtain the mixture, setting the speed of the stirrer to be 10-20 rpm, and setting the stirring time to be 4-6 min;
regulating and controlling the slow setting time, adding corresponding amounts of phosphogypsum and desulfurized gypsum into the mixture obtained in the step two to obtain cement coarse materials with different slow setting times, setting the stirring speed to be 12-18 rpm, and setting the stirring time to be 5-10 min;
step four, primary crushing, namely, performing primary crushing treatment on the coarse materials obtained in the step three to prepare retarded cement crushed materials;
fifthly, crushing again, namely centrifugally screening the delayed coagulation cement crushed aggregates obtained in the fourth step, crushing again and screening large particles obtained by screening, and directly using the cement meeting the particle requirements as the next step;
step six, polishing, namely putting the cement meeting the particle requirements in the step five into a ball mill for polishing to obtain the cement, wherein the rotating speed of the ball mill is 10-20 rpm, and the polishing time is 5-15 min;
and step seven, transferring the set retarding cement of the desulfurized gypsum for controlling the setting time in the step six to a storage tank for storage.
The main materials are as follows: 70-75% of clinker;
the auxiliary materials are as follows: 10-12% of limestone waste residue, 7-10% of steel powder slag and 4-5% of coal gangue;
the retarder is as follows: 3-8% of phosphogypsum and 0.4-5% of desulfurized gypsum;
the cement setting time is regulated and controlled by regulating and controlling the addition amount and the proportion of the phosphogypsum and the desulfurized gypsum;
the speed of the mixer for preparing the mixture is as follows: 10-20 rpm, and the stirring time is as follows: 4-6 min;
the stirring speed for regulating and controlling the slow setting time is as follows: 12-18 rpm, and the stirring time is as follows: 5-10 min;
the rotating speed of the ball mill is as follows: 10-20 rpm, polishing time: 5-15 min;
the clinker is as follows: 70-80% of limestone, 8-10% of carbonaceous shale and 5-15% of iron raw material;
SO in desulfurized gypsum3The contents are as follows: 30-50.2%, moisture: 14 to 20 percent.
The CaO content of the limestone is as follows: 45-55 wt%; SiO of the carbonaceous shale2The contents are as follows: 49-56 wt% of Al2O3The contents are as follows: 10-20 wt%; the iron raw material is selected from one or more of sulfuric acid slag, converter slag, iron ore or iron tailings;
the cementC in clinker3The content of A is: 1 to 4 wt%, C4The AF content is as follows: 14-20 wt% and f-CaO content is less than 1.5 wt%.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention utilizes the desulfurized gypsum as the cement retarder, not only reduces the production cost of the retarded cement, but also changes the industrial waste residue into valuable,
(2) the invention utilizes the ball mill for grinding, the particles are more uniform, and the dispersibility of the cement is better.
(3) The road retarding cement prepared by the method has proper setting time, slows down the evaporation speed of water in concrete, reduces the setting speed of the concrete, ensures the forming effect and quality of the concrete, and simultaneously improves the stability, the permeability resistance and the crack resistance of cement paste.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example 1:
step one, preparing clinker, namely putting 75% of limestone, 10% of carbonaceous shale and 15% of iron raw materials into a preparation chamber to prepare cement clinker.
Step two, preparing a mixture, namely transferring the cement clinker (70%) in the step one to a stirrer, adding corresponding auxiliary materials, uniformly stirring the auxiliary materials comprising limestone waste residues (10%), steel powder residues (8%) and coal gangue (4%), and obtaining the mixture, wherein the speed of the stirrer is set to 10rpm, and the stirring time is set to 6 min;
regulating and controlling the slow setting time, adding phosphogypsum (4%) and desulfurized gypsum (4%) in corresponding proportion into the mixture obtained in the step two according to requirements to obtain a cement coarse material, setting the stirring speed to be 15rpm, and setting the stirring time to be 8 min;
step four, primary crushing, namely, performing primary crushing treatment on the coarse materials obtained in the step three to prepare retarded cement crushed materials;
fifthly, crushing again, namely centrifugally screening the delayed coagulation cement crushed aggregates obtained in the fourth step, crushing again and screening large particles obtained by screening, and directly using the cement meeting the particle requirements as the next step;
step six, polishing, namely putting the cement meeting the particle requirements in the step five into a ball mill for polishing to obtain the cement, wherein the rotating speed of the ball mill is 15rpm, and the polishing time is 6 min;
and step seven, transferring the set retarding cement of the desulfurized gypsum for controlling the setting time in the step six to a storage tank for storage.
The retarded cement produced according to this example had the following physical property data:
example 2:
step one, preparing clinker, namely putting 78% of limestone, 9% of carbonaceous shale and 13% of iron raw materials into a preparation chamber to prepare cement clinker.
Step two, preparing a mixture, namely transferring the cement clinker (72%) in the step one to a stirrer, adding corresponding auxiliary materials, uniformly stirring the auxiliary materials comprising limestone waste residues (10%), steel powder residues (8%) and coal gangue (4%), and obtaining the mixture, wherein the speed of the stirrer is set to 10rpm, and the stirring time is set to 6 min;
regulating and controlling the slow setting time, adding phosphogypsum (3%) and desulfurized gypsum (3%) in corresponding proportion into the mixture obtained in the step two according to requirements to obtain cement coarse materials, setting the stirring speed to be 15rpm, and setting the stirring time to be 10 min;
step four, primary crushing, namely, performing primary crushing treatment on the coarse materials obtained in the step three to prepare retarded cement crushed materials;
fifthly, crushing again, namely centrifugally screening the delayed coagulation cement crushed aggregates obtained in the fourth step, crushing again and screening large particles obtained by screening, and directly using the cement meeting the particle requirements as the next step;
step six, polishing, namely putting the cement meeting the particle requirements in the step five into a ball mill for polishing to obtain the cement, wherein the rotating speed of the ball mill is 15rpm, and the polishing time is 6 min;
and step seven, transferring the set retarding cement of the desulfurized gypsum for controlling the setting time in the step six to a storage tank for storage.
The retarded cement produced according to this example had the following physical property data:
example 3:
step one, preparing clinker, namely putting 78% of limestone, 10% of carbonaceous shale and 12% of iron raw materials into a preparation chamber to prepare cement clinker.
Step two, preparing a mixture, namely transferring the cement clinker (72%) in the step one to a stirrer, adding corresponding auxiliary materials, uniformly stirring the auxiliary materials comprising limestone waste residues (11%), steel powder residues (7%) and coal gangue (4%), and obtaining the mixture, wherein the speed of the stirrer is set to be 12rpm, and the stirring time is set to be 6 min;
regulating and controlling the slow setting time, adding phosphogypsum (2.5%) and desulfurized gypsum (3.5%) in a corresponding proportion into the mixture obtained in the step two according to requirements to obtain a cement coarse material, setting the stirring speed to be 15rpm, and setting the stirring time to be 10 min;
step four, primary crushing, namely, performing primary crushing treatment on the coarse materials obtained in the step three to prepare retarded cement crushed materials;
fifthly, crushing again, namely centrifugally screening the delayed coagulation cement crushed aggregates obtained in the fourth step, crushing again and screening large particles obtained by screening, and directly using the cement meeting the particle requirements as the next step;
step six, polishing, namely putting the cement meeting the particle requirements in the step five into a ball mill for polishing to obtain the cement, wherein the rotating speed of the ball mill is 15rpm, and the polishing time is 8 min;
and step seven, transferring the set retarding cement of the desulfurized gypsum for controlling the setting time in the step six to a storage tank for storage.
The retarded cement produced according to this example had the following physical property data:
the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A method for controlling the setting time of cement produced by desulfurized gypsum is characterized by comprising the following steps: the method comprises the following steps:
step one, preparing clinker, namely putting 70-80% of limestone, 8-10% of carbonaceous shale and 5-15% of iron raw materials into a preparation chamber to prepare cement clinker;
step two, preparing a mixture, namely transferring the clinker obtained in the step one to a stirrer, adding corresponding auxiliary materials, uniformly stirring the auxiliary materials including limestone waste residues, steel powder residues and coal gangue to obtain the mixture, setting the speed of the stirrer to be 10-20 rpm, and setting the stirring time to be 4-6 min;
regulating and controlling the slow setting time, adding corresponding amounts of phosphogypsum and desulfurized gypsum into the mixture obtained in the step two to obtain cement coarse materials with different slow setting times, setting the stirring speed to be 12-18 rpm, and setting the stirring time to be 5-10 min;
step four, primary crushing, namely, performing primary crushing treatment on the coarse materials obtained in the step three to prepare retarded cement crushed materials;
fifthly, crushing again, namely centrifugally screening the delayed coagulation cement crushed aggregates obtained in the fourth step, crushing again and screening large particles obtained by screening, and directly using the cement meeting the particle requirements as the next step;
step six, polishing, namely putting the cement meeting the particle requirements in the step five into a ball mill for polishing to obtain the cement, wherein the rotating speed of the ball mill is 10-20 rpm, and the polishing time is 5-15 min;
and step seven, transferring the set retarding cement of the desulfurized gypsum for controlling the setting time in the step six to a storage tank for storage.
2. The method for controlling the setting time of cement produced by desulfurized gypsum according to claim 1, wherein: the main materials are as follows: 70-75% of clinker; the auxiliary materials are as follows: 10-12% of limestone waste residue, 7-10% of steel powder slag and 4-5% of coal gangue; the retarder is as follows: 3 to 8 percent of phosphogypsum and 0.4 to 5 percent of desulfurized gypsum.
3. The method for controlling the setting time of cement produced by desulfurized gypsum according to claim 1, wherein: the cement setting time can be regulated and controlled by regulating and controlling the addition amount and the proportion of the phosphogypsum and the desulfurized gypsum.
4. The method for controlling the setting time of cement produced by desulfurized gypsum according to claim 1, wherein: the speed of the mixer for preparing the mixture is as follows: 10-20 rpm, and the stirring time is as follows: 4-6 min.
5. The method for controlling the setting time of cement produced by desulfurized gypsum according to claim 1, wherein: the stirring speed for regulating and controlling the slow setting time is as follows: 12-18 rpm, and the stirring time is as follows: 5-10 min.
6. The method for controlling the setting time of cement produced by desulfurized gypsum according to claim 1, wherein: the rotating speed of the ball mill is as follows: 10-20 rpm, polishing time: 5-15 min.
7. The method for controlling the setting time of cement produced by desulfurized gypsum according to claim 2, wherein: the clinker is as follows: 70-80% of limestone, 8-10% of carbonaceous shale and 5-15% of iron raw material.
8. The method for controlling the setting time of cement produced by desulfurized gypsum according to claim 3, wherein: SO in desulfurized gypsum3The content is about 30-50.2%, and the water content is 14-20%.
9. The method of claim 7The method for controlling the setting time of cement produced by desulfurized gypsum is characterized by comprising the following steps: the CaO content of the limestone is 45-55 wt%; SiO of the carbonaceous shale249-56 wt% of Al2O3The content is 10-20 wt%; the iron raw material is selected from one or more of sulfuric acid slag, converter slag, iron ore or iron tailings.
10. The method for controlling the setting time of cement produced by desulfurized gypsum according to claim 9, wherein: c in the cement clinker31 to 4 wt% of A, C4The content of AF is 14-20 wt%, and the content of f-CaO is less than 1.5 wt%.
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Cited By (3)
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| CN112897908A (en) * | 2021-02-22 | 2021-06-04 | 金隅冀东凤翔环保科技有限公司 | Retarding high-strength ordinary portland cement and its preparing process and application |
| CN113582563A (en) * | 2021-07-21 | 2021-11-02 | 昆明理工大学 | Active admixture and preparation method thereof |
| CN115108744A (en) * | 2022-07-13 | 2022-09-27 | 华新水泥股份有限公司 | Process for decomposing phosphogypsum and co-producing cement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112897908A (en) * | 2021-02-22 | 2021-06-04 | 金隅冀东凤翔环保科技有限公司 | Retarding high-strength ordinary portland cement and its preparing process and application |
| CN113582563A (en) * | 2021-07-21 | 2021-11-02 | 昆明理工大学 | Active admixture and preparation method thereof |
| CN115108744A (en) * | 2022-07-13 | 2022-09-27 | 华新水泥股份有限公司 | Process for decomposing phosphogypsum and co-producing cement |
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