CN108340480A - A method of utilizing carbon dioxide step mineralising curing concrete building block - Google Patents
A method of utilizing carbon dioxide step mineralising curing concrete building block Download PDFInfo
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- CN108340480A CN108340480A CN201810068012.6A CN201810068012A CN108340480A CN 108340480 A CN108340480 A CN 108340480A CN 201810068012 A CN201810068012 A CN 201810068012A CN 108340480 A CN108340480 A CN 108340480A
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- curing
- maintenance
- carbon dioxide
- supercharging
- decompression
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- 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
- C04B40/0259—Hardening promoted by a rise in pressure
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a kind of methods using carbon dioxide step mineralising curing concrete building block, including：Determine that curing autoclave carries out n times supercharging maintenance and n times decompression, 3≤N≤8 successively；Pressure after n-th decompression is no more than the pressure of N+1 n times supercharging maintenance, n≤N；It is pressurized and is conserved according to n times, curing autoclave is divided into N+1 groups；N+1 groups curing autoclave sequentially enters supercharging maintenance in order, and when upper one group of curing autoclave enters supercharging maintenance next time, next group of curing autoclave just enters last supercharging and conserve；When curing autoclave enters n-th decompression, the carbon dioxide of decompression discharge is passed through to the curing autoclave for being in the supercharging maintenance of N n times, and external air source is coordinated to reach the supercharging maintenance of N+1 n times.The method increase existing mineralisings to strengthen CO in maintaining process2The utilization rate of gas.
Description
Technical field
The invention belongs to concrete curing technology fields, and in particular to a kind of to conserve coagulation using carbon dioxide step mineralising
The method of earth building blocks.
Background technology
With the development of building materials market, precast concrete is widely used in construction, they construct to reduce
Cost, shortening construction period provide a great convenience, and country also attaches great importance to the development of assembled architecture at this stage.
CO2Mineralising reinforcing concrete technology is the new concrete maintenance technology of fast development in recent years, with traditional steaming
Pressure maintenance is compared, CO2Curing temperature needed for mineralising reinforcing concrete technology is substantially less than steam press maintenance, in room temperature or slightly higher
It can be conserved under the environment temperature of room temperature, and curing time is short, can realize CO2Utilization with seal up for safekeeping for a long time, simultaneously
Promote the acceleration maintenance molding of building materials.In addition, steam press maintenance has strict requirements for the temperature of steam with pressure, slightly miss
Difference just will have a direct impact on the performance of product, therefore can not directly reuse the steam exhaust after maintenance, cause the big of raw material and the energy
Amount waste.
And in contrast, mineralising maintenance is to unstrpped gas CO2Temperature, pressure sensibility it is relatively low, for reuse dioxy
Change carbon, improves gas overall utilization rate and provide possibility.Chinese invention (CN 104290183A) disclose it is a kind of utilize titanium dioxide
The method that carbon conserves porous concrete building blocks, this method greatly shorten the curing time of building block, effectively carry compared to steam press maintenance
The ability of high concrete absorbing carbon dioxide gas and the quality of concrete product；And greenhouse gas emission can be effectively reduced
Amount, energy environmental protection, the generation for controlling greenhouse effects.But the invention can only carry out intermittent production process, complete primary
Complete production procedure needs to expend the more time, cannot achieve industrial quantity-produced requirement, adjacent maintenance processes
Switching interval is longer.In addition, the carbon dioxide gas after maintenance still has higher pressure, take in the invention straight
Run in the method put, is not set out and further utilizes method, reduce the transformation in planta rate and utilization rate of unstrpped gas.
On the other hand according to having the study found that the accelerated carbonation process of conventional concrete is one is determined by kinetic factor
The reaction process of fixed gradual diffusion control, with the progress of reaction, the permeability of concrete sample continuously decreases, containing calming the anger
Body raw material is lower to the diffusion rate inside concrete sample.It is maintained always in the maintenance stage curing autoclave of traditional handicraft
One higher gas pressure causes the reduction in maintenance later stage efficiency.Due to existing carbon dioxide mineralising maintaining process
Raw material availability it is low, cannot achieve continuous production, individual prefabricated component quality are relatively low, and there are when longer inefficient reaction silence
Between a series of problems, such as, so having no large-scale production and application always.
Mineralising, which strengthens maintenance, will realize the industrialized production of high-efficiency and economic, first have to solve CO2The overall utilization rate of gas
Care environments condition the problems such as there are acute variations in relatively low and maintenance processes.
Invention content
It is mixed in view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of conserved using carbon dioxide step mineralising
The method of solidifying earth building blocks improves existing mineralising and strengthens CO in maintaining process2The utilization rate of gas.
Technical solution provided by the present invention is：
A method of using carbon dioxide step mineralising curing concrete building block, including：
Determine that curing autoclave carries out n times supercharging maintenance and n times decompression, 3≤N≤8 successively；Pressure after n-th decompression is not
The pressure of more than the N+1-n times supercharging maintenance, n≤N；
It is pressurized and is conserved according to n times, curing autoclave is divided into N+1 groups；
N+1 groups curing autoclave sequentially enters supercharging maintenance in order, when upper one group of curing autoclave enters supercharging maintenance next time,
Next group of curing autoclave just enters last supercharging and conserves；
When curing autoclave enters n-th decompression, the carbon dioxide of decompression discharge is passed through and is in the N-n times supercharging maintenance
Curing autoclave, and coordinate external air source reach the N+1-n times supercharging maintenance.
In above-mentioned technical proposal, curing autoclave is enable to be carried out continuously supercharging maintenance and decompression through reasonable settings, it is real
The continuity now conserved；In addition, the carbon dioxide after decompression is re-used for supercharging maintenance, the profit of carbon dioxide gas is improved
With rate, the stability of gaseous environment during intensified response reduces energy consumption, reduces production cost.
Curing autoclave can undergo n times supercharging maintenance when being conserved, pressure gradually increases, such as the 1st supercharging maintenance, and the 2nd
Secondary supercharging maintenance ..., n-th supercharging maintenance；Corresponding curing autoclave can undergo n times decompression, and pressure gradually reduces, such as the 1st time
Decompression, the 2nd decompression ..., n-th decompression.In addition, pressure after depressurizing for the 1st time can be between the N-1 time supercharging maintenance and the
Between the pressure of n times supercharging maintenance, the pressure after other decompression also complies with this rule.Therefore, " the 1st decompression, the 2nd time
Pressure state after decompression ..., n-th decompression " can be respectively designated as " secondary N grades of increasing maintenance pressure ..., secondary 2 grades of superchargings maintenance
Pressure, secondary 1 grade of supercharging maintenance pressure ".
Same group of curing autoclave quantity can be selected according to specific operating mode, and each group of curing autoclave quantity can also differ
Sample.
Preferably, the curing autoclave carries out n times supercharging maintenance and n times decompression, 3≤N≤4 successively.
Preferably, when the curing autoclave decompression, curing autoclave is connected to and is then passed into carbon dioxide by pressure difference
Corresponding curing autoclave.
Preferably, when the curing autoclave is in last time decompression, carbon dioxide lack of gas are stored in corresponding gas
Buffer part flow arrangement.Further preferably, the gas buffer part flow arrangement is that buffering divides gas tank.
Preferably, the carbon dioxide lack of gas in the gas buffer part flow arrangement prepare shaping period for concrete segment
Between.During prefabricated component prepares molding, part low pressure CO 2 gas is blasted in advance, and gas source is gas buffer shunting dress
Put back into the carbon dioxide lack of gas of receipts.Since the kinetic factor of reaction limits, the maintenance effect of the center of prefabricated component is far low
Maintenance effect in surface layer blasts partial CO 2 gas in advance, can be formed inside it in prefabricated component preparation process more
Point Calcium Carbonate Particles, can not only increase its early strength, promote its early stage to be molded, can also improve the internal structure of product,
Reduce the area of interiors of products brittle interface, enhanced products performance.
Preferably, the maintenance pressure difference that the n times supercharging conserves adjacent time is 0.1-1MPa.
Preferably, being directed to solid concrete building block, after the n times supercharging maintenance, maintenance pressure reaches 1.5-2.5MPa；
For porous concrete building blocks, after the n times supercharging maintenance, maintenance pressure reaches 1-1.5MPa.
Preferably, the time of each supercharging maintenance of the n times supercharging maintenance is 0.1-1h.
Preferably, minimum temperature is not less than 20 DEG C in supercharging maintenance processes, maximum temperature is not higher than 60 DEG C, entire maintenance
Temperature range is 20 DEG C -60 DEG C in the process.
Compared with the existing technology, beneficial effects of the present invention are embodied in：According to the dynamic characteristic of reaction, using gas ladder
Grade partial pressure cyclic design, is supplemented and cyclic policy by specific gas, effectively enhances the utilization rate of CO 2 raw material gas body,
The quiet hour of reaction is effectively reduced, operating mode switching time during the reaction is mainly shortened.On the other hand, pass through gas
Body step divides cyclic design, and multigroup curing autoclave can be made to share one group of air source and gas pressurized device, reduce production cost.
Description of the drawings
Fig. 1 is the artwork that carbon dioxide step mineralising curing concrete building block is utilized in embodiment；
Fig. 2 is that sample carbon sequestration rate changes over time tendency chart under different operating modes in application examples；
Fig. 3 is the compression strength comparison diagram of sample under different operating modes in application examples.
Specific implementation mode
With reference to specific embodiment, present invention will be explained in further detail.
Embodiment
As shown in Figure 1, curing autoclave includes 4 groups, and every group one, respectively B1 grades of curing autoclave, B2 grades of curing autoclaves, B3 grades of maintenances
Kettle and B4 grades of curing autoclaves.
Each curing autoclave is pressurized maintenance and is depressurized three times three times successively, and the pressure for being pressurized maintenance three times is respectively one
Grade maintenance pressure, two level maintenance pressure and three-level conserve pressure；Pressure after depressurizing three times is respectively that time three-level conserves pressure, secondary
Two level conserves pressure and conserves pressure with time level-one.
Specifically comprise the following steps：
(1) B1 grades of reinforcing kettles pass first into external carbon dioxide air source, and air pressure in kettle is made to reach level-one maintenance pressure
0.5MPa keeps external air source gas supply, 0.5h is conserved under the gas pressure；
(2) external air source make-up gas is continuing with to B1 grades of reinforcing kettles, and pressure in kettle is made to reach two level maintenance pressure
1MPa maintains to continue to conserve 0.5h under this pressure state；
At the same time, B2 grades of reinforcing kettles connect external air source, maintain pressure to conserve pressure 0.5MPa in level-one, start to conserve
0.5h；
(3) external air source make-up gas is continuing with to B1 grades of reinforcing kettles, and pressure in kettle is made to reach three-level maintenance pressure
1.5MPa continuing to conserve 0.5h under this pressure state；
At the same time, B2 grades of reinforcing kettles are supplemented to using external air source, pressure in kettle are made to reach two level maintenance pressure 1Mpa,
Continue to conserve 0.5h；
At the same time, B3 grades of reinforcing kettles connection external air source to pressure reach level-one maintenance pressure 0.5MPa, start to conserve
0.5h；
(4) B1 reinforcings kettle enters decompression phase, and B1, which is strengthened the carbon dioxide in kettle, using pressure difference is passed into B2 grades by force
Change kettle so that B1 strengthens kettle and the pressure of B2 grades of reinforcing kettles reaches time three-level maintenance pressure, and B2 grades of reinforcing kettles are continuing with outside
Air source is supplemented to three-level maintenance pressure 1.5MPa, continues to conserve 0.5h；
(5) it continues with pressure difference and the carbon dioxide in B1 reinforcing kettles is passed into B3 grades of reinforcing kettles so that B1 strengthens kettle
Reach time two level with the pressure of B3 grades of reinforcing kettles and conserve pressure, B3 grades of reinforcing kettles are continuing with external air source and are supplemented to two level maintenance
Pressure 1MPa continues to conserve 0.5h；
(6) it continues with pressure difference and the carbon dioxide in B1 reinforcing kettles is passed into B4 grades of reinforcing kettles so that B1 strengthens kettle
Reach time level-one with the pressure of B4 grades of reinforcing kettles and conserve pressure, B4 grades of reinforcing kettles are continuing with external air source and are supplemented to level-one maintenance
Pressure 0.5MPa continues to conserve 0.5h；
(7) remaining carbon dioxide lack of gas are passed through buffering and divide in gas tank by B1 grades of reinforcing kettles stores, and is prepared into prefabricated component
During type, carbon dioxide lack of gas are blasted in advance, make that multiple spot Calcium Carbonate Particles can be formed inside it；Meanwhile it taking out B1 grades strong
Change building block in kettle and the new a batch of loading does not strengthen building block；
(8) B2 grades of reinforcing kettles initially enter the decompression phase of a new round, repeat step 4) -7), wherein the carbon dioxide containing pressure
Gas is passed through B3 grades of reinforcing kettles, B4 grades of reinforcing kettles according to gas concentration lwevel step, and B1 grades of reinforcing kettles and buffering are divided in gas tank,
Above-mentioned process can constantly recycle progress according to operating mode.
Application examples
The 2cm*2cm*2cm building blocks prepared using OPC net slurries are carried out mineralising under three kinds of maintainer conditions as sample, respectively and supported
Shield.
Conserve operating mode 1：It is conserved using constant pressure, conserves pressure 2.5Mpa, 40 DEG C of curing temperature, curing time 2h.
Conserve operating mode 2：It is conserved using the step mineralising in embodiment, 40 DEG C of curing temperature, 0.5h is conserved under 0.5MPa,
1h is conserved under 1.5MPa, and 0.5h is conserved under 2.5MPa.
Conserve operating mode 3：It is conserved using constant pressure, conserves pressure 0.5Mpa, 40 DEG C of curing temperature, curing time 2h.
Be compared for the maintenance result of above-mentioned three kinds of operating modes, as shown in Fig. 2, under different operating modes with maintenance into
Row, 1 sample of operating mode increase rapidly in maintenance initial stage carbon sequestration rate, but when carbon sequestration rate reaches to a certain degree, reaction rate occurs
It declines to a great extent, remains unchanged substantially in maintenance middle and later periods carbon sequestration rate.2 sample of operating mode is slower in maintenance initial stage carbon sequestration rate growth,
Carbon sequestration rate is suitable with operating mode 3, and with the progress that step conserves, a state gradually increased is presented in carbon sequestration rate, finally
Carbon sequestration rate can reach is much higher than the carbon sequestration rate of 3 times maintenance samples of operating mode with 1 comparable degree of operating mode, 2h carbon sequestration rates.Knot
Fig. 3 is closed it is found that a positive correlation, the mechanics of 2 times maintenance samples of operating mode is presented with the last mechanical property of sample in carbon sequestration rate
Performance is apparently higher than 3 times maintenance samples of operating mode.
Claims (7)
1. a kind of method using carbon dioxide step mineralising curing concrete building block, which is characterized in that including：
Determine that curing autoclave carries out n times supercharging maintenance and n times decompression, 3≤N≤8 successively；Pressure after n-th decompression is not more than
The pressure of the N+1-n times supercharging maintenance, n≤N；
It is pressurized and is conserved according to n times, curing autoclave is divided into N+1 groups；
N+1 groups curing autoclave sequentially enters supercharging maintenance in order, next when upper one group of curing autoclave enters supercharging maintenance next time
Group curing autoclave just enters last supercharging and conserves；
When curing autoclave enters n-th decompression, the carbon dioxide of decompression discharge is passed through and is in supporting for the N-n times supercharging maintenance
Kettle is protected, and external air source is coordinated to reach the N+1-n times supercharging maintenance.
2. the method according to claim 1 using carbon dioxide step mineralising curing concrete building block, which is characterized in that
The curing autoclave carries out n times supercharging maintenance and n times decompression, 3≤N≤4 successively.
3. the method according to claim 1 using carbon dioxide step mineralising curing concrete building block, which is characterized in that
When the curing autoclave decompression, curing autoclave is connected to, carbon dioxide is then passed by corresponding curing autoclave by pressure difference.
4. the method according to claim 1 using carbon dioxide step mineralising curing concrete building block, which is characterized in that
When the curing autoclave is in last time decompression, carbon dioxide lack of gas are stored in corresponding gas buffer part flow arrangement.
5. the method according to claim 4 using carbon dioxide step mineralising curing concrete building block, which is characterized in that
During carbon dioxide lack of gas in the gas buffer part flow arrangement prepare molding for concrete segment.
6. the method according to claim 1 using carbon dioxide step mineralising curing concrete building block, which is characterized in that
The maintenance pressure difference that the n times supercharging maintenance is adjacent time is 0.1-1MPa.
7. the method according to claim 1 using carbon dioxide step mineralising curing concrete building block, which is characterized in that
The time of each supercharging maintenance of the n times supercharging maintenance is 0.1-1h.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108911785A (en) * | 2018-09-14 | 2018-11-30 | 河南环宇石化装备科技股份有限公司 | It is a kind of to conserve steam-pressing brisk process units using carbon dioxide gas |
| CN109053112A (en) * | 2018-10-10 | 2018-12-21 | 河南理工大学 | A kind of building material and its method using desulfurized gypsum and quick lime preparation |
| CN113698229A (en) * | 2021-09-15 | 2021-11-26 | 浙江天地环保科技股份有限公司 | Process for maintaining fly ash aerated building block by coupling steam and carbon dioxide |
| CN114007997A (en) * | 2019-06-26 | 2022-02-01 | 奥比斯产品公司 | Method for producing carbonate-bonded compacted articles |
| CN114210694A (en) * | 2021-12-16 | 2022-03-22 | 江苏集萃功能材料研究所有限公司 | Device and method for mineralizing low-concentration carbon dioxide by using solid waste |
| CN114347236A (en) * | 2022-01-27 | 2022-04-15 | 四川博菲硕科技有限公司 | Continuous curing method and system for curing building material products by programmed carbon dioxide |
| CN114851370A (en) * | 2022-06-08 | 2022-08-05 | 山东汉博昱洲新材料有限公司 | Pulse type carbon mineralization maintenance process |
| CN115157425A (en) * | 2022-09-07 | 2022-10-11 | 广东广业投资集团有限公司 | Concrete block mineralization maintenance system and method |
| CN115403337A (en) * | 2022-09-23 | 2022-11-29 | 清捕零碳(北京)科技有限公司 | Carbon fiber-negative cement board and preparation method thereof |
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| CN109053112A (en) * | 2018-10-10 | 2018-12-21 | 河南理工大学 | A kind of building material and its method using desulfurized gypsum and quick lime preparation |
| CN114007997A (en) * | 2019-06-26 | 2022-02-01 | 奥比斯产品公司 | Method for producing carbonate-bonded compacted articles |
| CN113698229A (en) * | 2021-09-15 | 2021-11-26 | 浙江天地环保科技股份有限公司 | Process for maintaining fly ash aerated building block by coupling steam and carbon dioxide |
| CN114210694A (en) * | 2021-12-16 | 2022-03-22 | 江苏集萃功能材料研究所有限公司 | Device and method for mineralizing low-concentration carbon dioxide by using solid waste |
| CN114347236A (en) * | 2022-01-27 | 2022-04-15 | 四川博菲硕科技有限公司 | Continuous curing method and system for curing building material products by programmed carbon dioxide |
| CN114851370A (en) * | 2022-06-08 | 2022-08-05 | 山东汉博昱洲新材料有限公司 | Pulse type carbon mineralization maintenance process |
| CN115157425A (en) * | 2022-09-07 | 2022-10-11 | 广东广业投资集团有限公司 | Concrete block mineralization maintenance system and method |
| CN115403337A (en) * | 2022-09-23 | 2022-11-29 | 清捕零碳(北京)科技有限公司 | Carbon fiber-negative cement board and preparation method thereof |
| CN115403337B (en) * | 2022-09-23 | 2024-04-26 | 清捕零碳(北京)科技有限公司 | Negative carbon fiber cement board and preparation method thereof |
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Effective date of registration: 20220720 Address after: 101100 112-c37, block B, NO.560, Luyuan South Street, Tongzhou District, Beijing Patentee after: QingChu zero carbon (Beijing) Technology Co.,Ltd. Address before: 310013 Yuhang Tang Road, Xihu District, Hangzhou, Zhejiang 866 Patentee before: ZHEJIANG University |