CN115340406A - Microwave carbonization curing method for carbon dioxide mineralized product - Google Patents
Microwave carbonization curing method for carbon dioxide mineralized product Download PDFInfo
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- CN115340406A CN115340406A CN202210843755.2A CN202210843755A CN115340406A CN 115340406 A CN115340406 A CN 115340406A CN 202210843755 A CN202210843755 A CN 202210843755A CN 115340406 A CN115340406 A CN 115340406A
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- microwave
- carbonization
- mineralized
- carbon dioxide
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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
- 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
- C04B40/02—Selection of the hardening environment
- C04B40/0204—Selection of the hardening environment making use of electric or wave energy or particle radiation
- C04B40/0213—Electromagnetic waves
- C04B40/0218—Microwaves
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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
- 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
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
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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
- 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
- C04B40/02—Selection of the hardening environment
- C04B40/0263—Hardening promoted by a rise in temperature
Abstract
The invention discloses a microwave carbonization curing method of a carbon dioxide mineralized product, which comprises the steps of moving a green body to be mineralized into microwave carbonization equipment; performing water molecule activation treatment on the green body by using microwaves, and introducing industrial tail gas containing carbon dioxide for microwave carbonization maintenance for 2-4h; in the curing process, adjusting the microwave frequency according to the internal temperature change of the blank; simultaneously starting a cooling circulation device and a gas circulation device in the equipment, and regulating and controlling the carbonization temperature and CO 2 Concentration, realizes the quick dehydration of the blank body, and simultaneously, the carbonization reaction quickly occurs to improve the strength of the product. According to the invention, free water in the green body is activated through different microwave frequencies, so that the free water is easier to separate from the surface of the object to be mineralized, dehydration and carbonization are synchronously performed, the shrinkage and cracking of the green body caused by rapid dehydration are avoided, the maintenance time is greatly shortened, meanwhile, industrial tail gas can be fully utilized under the low pressure condition of 0-0.05MPa, the maintenance energy consumption is reduced, and energy conservation and environmental protection are realized.
Description
Technical Field
The invention belongs to the technical field of carbonization and maintenance of mineralized products, and particularly relates to a microwave carbonization and maintenance method of a carbon dioxide mineralized product.
Technical Field
In recent years, while economic science and technology are rapidly developed, the environmental awareness of human beings is also enhanced, and China also implements corresponding policies and guidelines.
The existing maintenance technology of the mineralized product comprises natural maintenance, steam pressure maintenance and the like, so that on one hand, the production period is long, the production efficiency is low, on the other hand, the energy consumption is high, and the cost is relatively improved; in the case of ordinary carbonization and maintenance, the mineralized material is used for absorbing carbon dioxide in industrial tail gas to achieve the purposes of carbon capture, utilization and sealing, but due to the limitation of conditions such as the quality of industrial tail gas and equipment factors, the existing carbonization and maintenance process has the problems of long reaction period, defects in products, low strength and the like, and even if the above limiting conditions are rectified, the problems of long period, unstable product strength and the like exist, so that the carbonization and maintenance process is difficult to adapt to the requirements of industrial production. How to shorten the carbonization reaction period and rapidly improve the strength of the carbonized product becomes the key for improving the production efficiency and reducing the comprehensive cost of products in the industry.
Disclosure of Invention
The invention aims to provide a microwave carbonization curing method of a carbon dioxide mineralized product, which aims to solve the problems of long carbonization reaction period, product defects and low product strength of the existing mineralized material.
In order to achieve the purpose, the method is realized by the following technical scheme:
a microwave carbonization curing method of carbon dioxide mineralized products comprises the following steps:
(1) Transferring the molded blank to be mineralized into microwave carbonization equipment;
(2) Performing water molecule activation treatment on the green body to be mineralized by adopting microwaves, and introducing industrial tail gas containing carbon dioxide for microwave carbonization maintenance for 2-4h;
(3) In the microwave curing process in the step (2), adjusting the microwave frequency according to the temperature change condition in the green body to be mineralized, and controlling the temperature in the green body to be mineralized not to exceed 80 ℃;
(4) And (3) in the microwave curing process in the step (2), cooling circulation and gas circulation are carried out in the microwave carbonization equipment, so that the blank to be mineralized is quickly dehydrated, and meanwhile, the carbonization reaction also quickly occurs, and the product strength is improved.
Further, the microwave carbonization equipment is any one of box type microwave equipment, tunnel type microwave equipment or small microwave machines.
Further, the microwave carbonization equipment is a mobile microwave device.
Further, the pressure of the industrial tail gas containing carbon dioxide in the step (2) in the microwave carbonization equipment is 0-0.05MPa.
Further, the volume concentration of the carbon dioxide in the industrial tail gas containing carbon dioxide in the step (2) is more than or equal to 10 percent.
Further, the microwave frequency in the step (2) is 400-2450MHz, and the corresponding wavelength is 0.75-0.12m.
Further, in the step (3), according to the temperature change condition inside the body to be mineralized, the microwave frequency adjustment is carried out, specifically: curing the temperature in the blank to be mineralized for 30-60min at the temperature of less than or equal to 45 ℃, curing for 60-120min at the temperature of 45-65 ℃ and curing for 30-60min at the temperature of 65-80 ℃, and adjusting the temperature by respectively adopting three different microwave frequencies of 400-450MHz, 2000-2450MHz and 850-900MHz, so that the temperature rise speed of the blank to be mineralized is reduced from slow to fast.
Further, in the cooling circulation and the gas circulation in the microwave carbonization equipment in the step (4), the final temperature in the microwave carbonization curing stage is controlled to be less than or equal to 80 ℃, and the concentration difference of carbon dioxide monitored at each position in the equipment is less than or equal to 2%.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention utilizes the synergistic action of microwave and carbonization to maintain the mineralized product, regulates the microwave frequency to 400-2450MHz, and the microwave frequency range has deep heating action depth on the mineralized product, thereby realizing the synchronous temperature rise of the mineralized product from the inside to the outside, along with the separation of water molecules in the mineralized product, carbon dioxide is easier to enter the mineralized blank body, the product is effectively and uniformly carbonized, and the carbonization strength is rapidly improved.
2. Based on the advantages of the maintenance method, the maintenance time is shortened from 12-24h to 2-4h, the production efficiency is improved, energy conservation and environmental protection are realized, and the method has good industrial popularization and application prospects.
3. Based on the advantages of the maintenance method, the maintenance requirement can be met under the conditions that the carbonization pressure is 0-0.05MPa and the concentration of carbon dioxide is more than or equal to 10 percent, so that the energy-saving and consumption-reducing requirements are met, and the industrial application requirements are met.
4. The microwave heating maintenance of the invention is divided into three stages: the first stage is heated to 45 ℃ and maintained for 30-60min, the second stage is heated to 45-65 ℃ and maintained for 60-120min, and the third stage is slowly heated to 65-80 ℃ and maintained for 30-60min. Three microwave frequencies are adopted according to the temperature change in the blank body, and the adjustment process from low frequency to high frequency to low frequency is adopted, so that on one hand, the effectiveness of microwave energy utilization can be improved, and the energy loss is reduced; on the other hand, in the first stage, the low frequency is more beneficial to penetrating the mineralized blank body, so that water molecules in the mineralized blank body are activated, and the mineralized blank body is not easy to dehydrate quickly, so that carbon dioxide gas can enter the mineralized blank body more easily; in the second stage, the temperature is favorable for full carbonization reaction inside and outside the mineralized green body; in the third stage, the microwave frequency is properly reduced, the temperature rise rate is slowed down, and the carbonization reaction is more favorably carried out.
5. In the microwave carbonization process, cooling circulation and gas circulation are carried out in the equipment, so that the internal atmosphere of the equipment is uniform, the concentration difference of carbon dioxide monitored at each position is less than or equal to 2 percent, and the product is carbonized more uniformly; water released by the microwave is quickly condensed and discharged, the carbonization interference is reduced, and the strength generated by quick carbonization of the green body is realized. The aim that the final temperature is less than or equal to 80 ℃ in the microwave carbonization curing stage can be achieved by adopting an automatic circulating system to control the circulating water temperature, and if the temperature is higher than the final temperature, the carbonization intensity is adversely affected due to too dry and lack of reaction media of carbon dioxide gas.
Detailed Description
The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.
The microwave carbonization curing method of the invention simultaneously carries out microwave curing and carbonization curing. The microwave can generate similar friction force between water molecules in the mineralized green body and adjacent molecules, so that heat is generated, the mineralized green body is easy to separate from the surface of the to-be-mineralized object, carbon dioxide gas is easy to enter the to-be-mineralized object, the green body is easy to generate carbonization reaction, the carbonization strength is fully and effectively improved, and the phenomenon that the green body shrinks and cracks due to rapid dehydration is avoided.
Example 1
A microwave carbonization curing method of carbon dioxide mineralized products comprises the following steps,
(1) And (4) moving the molded blank body to be mineralized into microwave carbonization equipment.
(2) And (3) performing water molecule activation treatment on the green body by using microwaves, and introducing industrial tail gas containing carbon dioxide, wherein the carbonization pressure is 0MPa, the carbon dioxide concentration is 10%, and performing microwave carbonization maintenance for 2.5h.
(3) During the microwave carbonization curing process, according to the temperature change condition inside the blank body, carrying out microwave frequency adjustment, wherein in the first stage, the microwave frequency is 422MHz, the temperature is raised to 45 ℃, and the curing time is 36min; in the second stage, the microwave frequency is 2450MHz, the temperature is raised to 60 ℃, and the curing time is 73min; in the third stage, the microwave frequency is 870MHz, the temperature is slowly increased to 70 ℃, and the curing time is 41min.
(4) And cooling circulation and gas circulation are carried out in the equipment in the microwave carbonization process, the concentration difference of carbon dioxide monitored at each position is 1%, and the final temperature in the microwave carbonization curing stage is 71 ℃.
Example 2
A microwave carbonization curing method of carbon dioxide mineralized products comprises the following steps,
(1) Transferring the molded blank body to be mineralized into microwave carbonization equipment;
(2) Performing water molecule activation treatment on the green body by using microwaves, introducing industrial tail gas containing carbon dioxide at the same time, and performing microwave carbonization curing for 3 hours, wherein the carbonization pressure is 0.04MPa and the carbon dioxide concentration is 20%;
(3) During the microwave carbonization curing process, according to the temperature change condition inside the blank body, carrying out microwave frequency adjustment, wherein in the first stage, the microwave frequency is 400MHz, the temperature is raised to 45 ℃, and the curing time is 60min; in the second stage, the microwave frequency is 2440MHz, the temperature is raised to 62 ℃, and the curing time is 76min; and in the third stage, the microwave frequency is 850MHz, the temperature is increased to 68 ℃, and the curing time is 44min.
(4) Cooling circulation and gas circulation are carried out in the equipment in the microwave carbonization process, the concentration difference of carbon dioxide monitored at each position is 0.5%, and the final temperature in the microwave carbonization curing stage is 74 ℃.
Example 3
A microwave carbonization curing method of carbon dioxide mineralized products comprises the following steps,
(1) Transferring the molded blank body to be mineralized into microwave carbonization equipment;
(2) Performing water molecule activation treatment on the green body by using microwaves, and introducing industrial tail gas containing carbon dioxide at the same time, wherein the carbonization pressure is 0.03MPa and the carbon dioxide concentration is 33 percent, and performing microwave carbonization maintenance for 4 hours;
(3) During the microwave carbonization curing process, according to the temperature change condition inside the blank body, adjusting the microwave frequency, at the first stage, heating the microwave frequency to 450MHz and the temperature to 45 ℃, and curing for 60min; in the second stage, the microwave frequency is 2400MHz, the temperature is raised to 64 ℃, and the curing time is 120min; and in the third stage, the microwave frequency is 900MHz, the temperature is increased to 70 ℃, and the curing time is 60min.
(4) Cooling circulation and gas circulation are carried out in the equipment in the microwave carbonization process, the concentration difference of carbon dioxide monitored at each position is 1%, and the final temperature in the microwave carbonization curing stage is 77 ℃.
Example 4
A microwave carbonization curing method of carbon dioxide mineralized products comprises the following steps,
(1) Transferring the molded blank body to be mineralized into microwave carbonization equipment;
(2) Performing water molecule activation treatment on the green body by using microwaves, and introducing industrial tail gas containing carbon dioxide at the same time, wherein the carbonization pressure is 0.05MPa and the carbon dioxide concentration is 40%, and performing microwave carbonization maintenance for 2h;
(3) During the microwave carbonization curing process, according to the temperature change condition inside the blank body, adjusting the microwave frequency, at the first stage, heating the microwave frequency of 410MHz to 45 ℃, and curing for 30min; in the second stage, the microwave frequency is 2410MHz, the temperature is raised to 65 ℃, and the curing time is 60min; in the third stage, the microwave frequency is 890MHz, the temperature is increased to 72 ℃, and the curing time is 30min.
(4) And cooling circulation and gas circulation are carried out in the equipment in the microwave carbonization process, the concentration difference of carbon dioxide monitored at each position is 2%, and the final temperature in the microwave carbonization curing stage is 78 ℃.
Comparative example 1
The ordinary carbonization curing method comprises the following steps,
(1) Moving the molded blank to be mineralized into carbonization equipment;
(2) Introducing industrial tail gas containing carbon dioxide, wherein the carbonization pressure is 0.05MPa, the carbon dioxide concentration is 40%, and carrying out carbonization maintenance for 24h;
(3) And (5) releasing pressure after cooling and temperature reduction, and taking out of the kettle to obtain a final product.
Comparative example 2
The ordinary carbonization curing method comprises the following steps,
(1) Moving the molded blank to be mineralized into carbonization equipment;
(2) Introducing industrial tail gas containing carbon dioxide, carbonizing and curing for 2h, wherein the carbonizing pressure is 0.05MPa and the carbon dioxide concentration is 40%;
(3) And (5) releasing pressure after cooling and temperature reduction, and taking out of the kettle to obtain a final product.
Comparing the product in the embodiment of the invention with the comparative product, the product strength is compared with the comparative product strength in the following table under the condition of greatly shortening the curing time:
the data in the table show that the product strength increase rate is more than 40 percent, and the method has obvious effect.
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 (8)
1. The microwave carbonization curing method of the carbon dioxide mineralized product is characterized by comprising the following steps:
(1) Transferring the molded blank body to be mineralized into microwave carbonization equipment;
(2) Performing water molecule activation treatment on a blank to be mineralized by adopting microwaves, and introducing industrial tail gas containing carbon dioxide for microwave carbonization maintenance for 2-4h;
(3) In the microwave curing process in the step (2), adjusting the microwave frequency according to the temperature change condition in the green body to be mineralized, and controlling the temperature in the green body to be mineralized not to exceed 80 ℃;
(4) And (3) in the microwave curing process in the step (2), cooling circulation and gas circulation are carried out in the microwave carbonization equipment, so that the blank to be mineralized is quickly dehydrated, and meanwhile, the carbonization reaction also quickly occurs, and the product strength is improved.
2. The microwave carbonization curing method of the carbon dioxide mineralized product according to claim 1, wherein the microwave carbonization device is any one of a box type microwave device, a tunnel type microwave device, or a small microwave machine.
3. The microwave carbonization curing method of the carbon dioxide mineralized product according to claim 1, wherein the microwave carbonization apparatus is a mobile microwave device.
4. The microwave carbonization curing method of the carbon dioxide mineralized product according to claim 1, wherein the pressure of the industrial tail gas containing carbon dioxide in step (2) in the microwave carbonization equipment is 0-0.05MPa.
5. The microwave carbonization curing method of the carbon dioxide mineralized product according to claim 1, wherein the volume concentration of carbon dioxide in the carbon dioxide-containing industrial tail gas in step (2) is not less than 10%.
6. The microwave carbonization curing method of the carbon dioxide mineralized products according to claim 1, wherein the microwave frequency in step (2) is 400-2450MHz, and the corresponding wavelength is 0.75-0.12m.
7. The microwave carbonization curing method of the carbon dioxide mineralized product according to claim 1, wherein in step (3), the microwave frequency adjustment is performed according to the temperature change condition inside the body to be mineralized, specifically: curing the temperature in the blank to be mineralized for 30-60min at the temperature of less than or equal to 45 ℃, curing for 60-120min at the temperature of 45-65 ℃ and curing for 30-60min at the temperature of 65-80 ℃, and adjusting the temperature by respectively adopting three different microwave frequencies of 400-450MHz, 2000-2450MHz and 850-900MHz, so that the temperature rise speed of the blank to be mineralized is reduced from slow to fast.
8. The microwave carbonization and curing method of the carbon dioxide mineralized product according to claim 1, wherein in the cooling cycle and the gas cycle in the microwave carbonization equipment in the step (4), the final temperature in the microwave carbonization and curing stage is controlled to be less than or equal to 80 ℃, and the concentration difference of the carbon dioxide monitored at each position in the equipment is less than or equal to 2%.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104044204A (en) * | 2014-05-30 | 2014-09-17 | 湖南大学 | Rapid pre-curing method for carbon dioxide curing cement-based materials |
| CN111099920A (en) * | 2019-12-27 | 2020-05-05 | 广西科学院 | Microwave curing method for assembled building materials |
| US20200223199A1 (en) * | 2017-07-14 | 2020-07-16 | Sig Technology Ag | Sheetlike Composite, Especially for Production of Dimensionally Stable Food or Drink Product Containers, Comprising a Polymer Layer P Having an L Value |
| CN113650132A (en) * | 2021-08-19 | 2021-11-16 | 武汉理工大学 | Artificial rock material suitable for negative temperature environment and preparation method thereof |
| CN114290504A (en) * | 2021-12-13 | 2022-04-08 | 北京建筑材料科学研究总院有限公司 | Production process and device for mineralizing and strengthening construction waste and mineralizing and curing concrete product by using tail gas of cement kiln |
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- 2022-07-18 CN CN202210843755.2A patent/CN115340406B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104044204A (en) * | 2014-05-30 | 2014-09-17 | 湖南大学 | Rapid pre-curing method for carbon dioxide curing cement-based materials |
| US20200223199A1 (en) * | 2017-07-14 | 2020-07-16 | Sig Technology Ag | Sheetlike Composite, Especially for Production of Dimensionally Stable Food or Drink Product Containers, Comprising a Polymer Layer P Having an L Value |
| CN111099920A (en) * | 2019-12-27 | 2020-05-05 | 广西科学院 | Microwave curing method for assembled building materials |
| CN113650132A (en) * | 2021-08-19 | 2021-11-16 | 武汉理工大学 | Artificial rock material suitable for negative temperature environment and preparation method thereof |
| CN114290504A (en) * | 2021-12-13 | 2022-04-08 | 北京建筑材料科学研究总院有限公司 | Production process and device for mineralizing and strengthening construction waste and mineralizing and curing concrete product by using tail gas of cement kiln |
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