CN109368642A - A method of promoting fresh concrete absorbing carbon dioxide efficiency - Google Patents
A method of promoting fresh concrete absorbing carbon dioxide efficiency Download PDFInfo
- Publication number
- CN109368642A CN109368642A CN201811428829.6A CN201811428829A CN109368642A CN 109368642 A CN109368642 A CN 109368642A CN 201811428829 A CN201811428829 A CN 201811428829A CN 109368642 A CN109368642 A CN 109368642A
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- CN
- China
- Prior art keywords
- cement
- concrete
- stirring
- cement slurry
- carbon dioxide
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/50—Carbon dioxide
- C01B32/55—Solidifying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/0007—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
Abstract
The invention discloses a kind of methods for promoting fresh concrete absorbing carbon dioxide efficiency.The present invention introduces Ball-stirring mill, independent mixing cement slurry in the agitating device of concrete；It will be stirred using Ball-stirring mill and wet-milling combine together.In stirring, the nanometer calcium carbonate that the hydrated product of cement particle surface and carbonization are deposited on particle surface is removed in time by wet-milling, cement granules is made constantly to expose fresh surface；Increase CO2With the contact area of cement granules and hydrated product and accelerate hydrated reaction of cement, so that greatly speeding up concrete mortar absorbs CO2Speed；This method can effectively avoid nano-calcium carbonate particles from depositing bring CO around cement granules2The problem of infiltration rate reduces, greatly improves CO2Infiltration rate and concrete production efficiency.
Description
Technical field
The present invention relates to a kind of promotion fresh concretes to absorb CO2The method of efficiency, belongs to CO2Seal solidification field up for safekeeping.
Background technique
The industrial revolution is broken out so far, and the process of industrialization and urbanization is accelerated rapidly, and global economy has obtained rapid hair
Exhibition.But traditional developmental model is the extensive economy development model to consume huge energy resource as cost, this is to the whole world
Ecological environment brings huge pressure, and the destruction of ecological environment makes the living space of the mankind be faced with increasingly serious threat.
In numerous ecological environment problems, climate warming is had become first of global ten overall situation problems.With the continuous raising of global warming,
The two poles of the earth and severe cold areas glacier can gradually melt, and lead to that sea level rise, flood coastal area by seawater.The thawing in glacier
Ecological environment can be also destroyed, numerous animals and plants in imminent danger will lose the space depended on for existence, face the danger of extinction.Climate warming
Mainly the greenhouse effects as caused by excess emissions carbon dioxide are brought, and reduce the discharge of carbon dioxide, have reduced greenhouse effects
Common recognition as countries in the world.
Currently, countries in the world are all striving to find reduction discharge CO2Most fast, most efficient method.Although each side is all long-pending
Pole response, measure is sought in effort, but since fossil fuel is still indispensable resource in human production activity, it is traditional with
Coal, petroleum, the fossil energies such as natural gas are that the production method of power changes in a short time, CO2Discharge amount at following one section
To also constantly it increase in time.Seal and solidify CO up for safekeeping2It is to reduce CO2A kind of common method of discharge, such as ore carbonization and ocean envelope
It deposits.But ore carbonization needs to make mineral enhancement pretreatment, this process is very since natural reaction process is slower
CO is sealed in energy consumption, ore carbonization up for safekeeping2Potentiality and pessimistic.Ocean, which is sealed up for safekeeping, can be such that seawater surface gas concentration lwevel increases, and change
The chemical feature of ocean, a series of problems, such as bringing surface seawater to be acidified.Therefore seeking one kind seals and solidifies CO up for safekeeping2New method
Have become the matter of great urgency.
Utilize CO2CO may be implemented in the property for easily reacting the stable carbonate of generation in the solution with alkaline matter2Seal up for safekeeping and
Solidification.Cement can generate a large amount of Ca (OH) in hydration process2, in the environment of having water, Ca (OH)2It will be with CO2Reaction generates
CaCO3If being passed through CO in mixing concrete2Exhaust gas utilizes hydrolysis product of cement and CO2The carburizing reagent of generation can
Realize CO2Absorption solidification.Currently, correlative study is unfolded to this in existing research personnel both at home and abroad, when mixing concrete, is being stirred
CO is injected in machine2Exhaust gas, and blender is made into sealing container makes its sealing, prevent CO2Exhaust leak is a kind of novel, ring
It protects, thorough carbon sequestration mode.
But CO2A large amount of nano-calcium carbonate particles objects not soluble in water are generated after reacting with hydrolysis product of cement,
Grain object is constantly deposited in cement particle surface.Moreover, with the continuous aquation of cement granules, hydrated product also will be in cement particle surface
Deposition.The two all makes CO2It is gradually reduced with the contact area of cement granules, reduces reaction speed, not only make CO2Infiltration rate
Constantly reduce.In addition, when nano-calcium carbonate particles object and hydrolysis product of cement reache a certain level the package of cement granules,
The CO of concrete mortar2Uptake is up to the upper limit, so far to CO2Uptake it is very low (still less than the 2% of cement consumption), greatly
It limits concrete and absorbs CO2Potentiality.Therefore urgent need finds one kind and is able to ascend fresh concrete slurry absorption CO2Efficiency
Method solves concrete mortar and absorbs CO2Speed is slow and the lower problem of uptake.
Summary of the invention
Goal of the invention of the invention is to absorb CO to make up fresh concrete2The problem of speed is slow, low efficiency, proposes
A kind of promotion fresh concrete absorption CO2The method of efficiency absorbs CO for fresh concrete2。
The present invention is achieved through the following technical solutions, a kind of side promoting fresh concrete absorbing carbon dioxide efficiency
Method, it is characterised in that: stirring mill apparatus is introduced in the stirring technique of concrete, stirring mill apparatus is used to carry out cement slurry
Grinding, and it is passed through CO2Gas realizes cement slurry to CO2Seal up for safekeeping and solidify；By by the cement granules table in cement slurry
Face generates and the nano-calcium carbonate particles deposited are removed in time, and cement granules is made constantly to expose fresh surface；And abrasive action
The aggregate of cement granules aggregate and nano-calcium carbonate particles and cement granules can be smashed in time.
As a kind of a kind of optimization side for the method for promoting fresh concrete absorbing carbon dioxide efficiency of the present invention
Case:
The stirring mill apparatus, including shell, shell one end are opening, and the other end is discharge port, and being equipped with will be in shell
Part is the partition of mixing chamber and storage bin；Shell positioned at the partition top is equipped with air inlet, sets on the air inlet
There is check valve；Several steel balls are placed in the mixing chamber；
The partition is equipped with several holes, and pore diameter is less than the diameter of steel ball in mixing chamber, to prevent steel ball from leaking into
In storage bin；
Further include the top cover for closing shell opening, the top cover be equipped with the water inlet being connected to enclosure interior and cement into
Material mouth, and the carbon dioxide concentration for detecting gas concentration lwevel in shell；Stirring motor is installed on the top cover,
And it is mounted on the helical blade on motor.
As a kind of a kind of optimization side for the method for promoting fresh concrete absorbing carbon dioxide efficiency of the present invention
Case: the steel ball is the steel ball of diameter of differing in size, and pore diameter is less than the straight of minimum steel ball in mixing chamber on the partition
Diameter.
As a kind of a kind of optimization side for the method for promoting fresh concrete absorbing carbon dioxide efficiency of the present invention
Case: introducing stirring mill apparatus in concrete stirring technology, refers to and is prepared by stirring mill apparatus according to the proportion of cement and water
Cement slurry, and CO is filled with into cement slurry2Gas, cement slurry is to CO2After sealing up for safekeeping and solidifying, mixed mud blender is flowed into
Neutralize aggregate and mineral admixture mixing concrete；Specific step is as follows:
1) calculated performance parameter: determining the single pot of amount of agitation and mixing time T of blender according to mixed mud blender performance parameter,
Determine the CO of every pot of cement consumption M and every pot of slurry according to concrete proportioning by single pot of amount of agitation again2Uptakem, then by water
Slurry body absorbs CO2Speedv, calculate the milling time that stirring mill apparatus prepares cement slurryt, in which:
；
2) feed: the cement of mass M is added in the cement feed inlet by stirring mill apparatus, water is added from water inlet in proportion, together
Shi Qidong stirring motor, mixing cement slurry；
3) it ventilates: in the CO for starting to store in advance while stirring2Gas is passed through in mixing chamber by air inlet, utilizes dioxy
Change the CO in concentration of carbon meter record mixing chamber2Gas concentration, and maintain CO2Gas concentration；
4) stir: lasting stirring absorbed CO2The cement slurry of gas flows into storage bin by partition, in whipping process, every
Milling timetThe cement of a mass M is supplemented, and is proportionally added into water, supplements the cement slurry in mixing chamber；
5) it discharges: opening storing bin discharge port external every time T, cement slurry is put into concrete mixer, thus with charging
It is synchronous, circulation production；
6) mixing concrete: mixed mud blender is utilized, then is proportionally added into aggregate and other mixed mud materials mixing coagulations
Soil.
The invention has the following advantages:
Steel ball in mixing chamber, which is stirred in whipping process by helical blade, to be dug, the nanometer that can deposit cement particle surface
CaCO3Particle and hydrolysis product of cement are removed in time, increase CO2With the contact area of hydrolysis product of cement, CO is greatly improved2's
Infiltration rate；Under same case, CO can be made with this method mixing concrete2Infiltration rate improve 5 times or more.
After the method for the present invention introduces grinding technics, the Nano-meter CaCO3 of cement particle surface deposition3Particle and hydrated cementitious produce
Object is removed in time, and cement slurry absorbs CO2Ability be no longer restricted, under same case, the CO of concrete can be made2Uptake
Improve 3-5 times.
The introducing of grinding technics greatly accelerates cement slurry and absorbs CO2Speed can be substantially when preparing concrete
Residence time of the cement slurry in mixing chamber is reduced, reduces discharge room every making concrete production efficiency improve 50%-100%.
Detailed description of the invention
Fig. 1 is concrete stirring production technology figure；
Fig. 2 is Ball-stirring mill apparatus structure schematic diagram；
Fig. 3 is diaphragm structure schematic diagram；
In figure: 10- shell；11- partition；12- mixing chamber；13- storage bin；14- steel ball；15- air inlet；16- check valve；17-
Water inlet；18- cement feed inlet；19- carbon dioxide concentration；20- top cover；30- discharge port；40- stirring motor；41- spiral
Blade；100- stirs mill apparatus；101- cementing tank；102- water tank；200- mineral admixture tank；300- aggregate tank；400- is mixed
Earth stirrer.
Specific embodiment
With reference to the accompanying drawings and examples, invention is further described in detail.
Embodiment 1
Concrete material composition and its mass percent are as follows: cementitious material is 42.5 portland cement of P.O (volume 488kg/
m3)；Fine aggregate is sand (volume 767kg/m3)；Coarse aggregate is gradation stone (the volume 1051kg/m of 5 ~ 20mm3)；Water (volume
244kg/m3)；CO2Uptake is the 2% of cement quality.
As shown in Figure 1, stirring mill apparatus 100 is added in this in concrete stirring technology, specifically: stirring mill apparatus 100,
Mineral admixture tank 200, aggregate tank 300 are connected to mixed mud blender 400 respectively；In addition, mix mill apparatus 100 also and cementing tank
101 are connected to water tank 102.
Stirring mill apparatus is introduced in concrete stirring technology, refers to the proportion by stirring mill apparatus according to cement and water
Cement slurry is prepared, and is filled with CO into cement slurry2Gas, cement slurry is to CO2After sealing up for safekeeping and solidifying, flows into mixed mud and stir
It mixes in machine and the mixings concrete such as aggregate and mineral admixture；Specific step is as follows:
1) calculated performance parameter: according to mixed mud blender performance parameter determine blender single pot of amount of agitation and mixing time T=
1min, then the CO of every pot of cement consumption M=488kg and every pot of slurry are determined by single pot of amount of agitation according to concrete proportioning2It inhales
Receipts amountm=9.76kg, then CO is absorbed by cement slurry2SpeedvAbout 1.95kg/min calculates stirring mill apparatus and prepares cement
The milling time of slurryt=5min。
2) feed: mass M=488kg cement is added in the cement feed inlet by stirring mill apparatus, in proportion from water inlet
Water 244kg is added, while starting stirring motor, mixing cement slurry；
3) it ventilates: in the CO for starting to store in advance while stirring2Gas is passed through in mixing chamber by air inlet, utilizes dioxy
Change the CO in concentration of carbon meter record mixing chamber2Gas concentration, and maintain CO2Gas concentration；
4) stir: lasting stirring absorbed CO2The cement slurry of gas flows into storage bin by partition, in whipping process, every
Milling timet=5min supplements the cement of a 488kg and the water of 244kg, the cement slurry in mixing chamber；
5) it discharges: opening storing bin discharge port external every time T=1min, cement slurry is put into concrete mixer, thus with
Charging synchronizes, circulation production；
6) mixing concrete: mixed mud blender is utilized, then is proportionally added into 767kg sand and 1051kg stone mixing coagulation
Soil.
It is measured through overtesting, when being not introduced into stirring mill apparatus, concrete absorbs CO2SpeedvIt is only about 0.39(kg/
Min), uptake is only capable of reach cement quality 0.5%, and introducing stirring mill apparatus makes CO2Infiltration rate improve about 5 times, absorb
Amount improves about 4 times.
Embodiment 2
As shown in Fig. 2, the stirring mill apparatus, including shell 10,10 one end of shell are opening, the other end is discharge port 30,
And it is equipped with and will be divided into the partition 11 of mixing chamber 12 and storage bin 13 inside shell 10；Shell 10 positioned at 11 top of partition
It is equipped with air inlet 15, the air inlet 15 is equipped with check valve 16；Several steel balls 14 are placed in the mixing chamber 12；
As shown in figure 3, the partition 11 be equipped with several holes, and pore diameter be less than mixing chamber 12 in steel ball 14 it is straight
Diameter, to prevent steel ball 14 from leaking into storage bin 13；
It further include for closing the open top cover 20 of shell 10, the top cover 20 is equipped with and the water inlet that is connected to inside shell 10
17 and cement feed inlet 18, and the carbon dioxide concentration 19 for detecting gas concentration lwevel in shell 10；The top cover
Stirring motor 40 is installed, and the helical blade 41 being mounted on motor 40 on 20.
Specifically, the discharge port 30 of closing of housing 10, prepares cement by water inlet 17 and cement feed inlet 18 in proportion
Slurry starts stirring motor 40, and under the rotation of helical blade 41, steel ball 14 comes into full contact with and grinds with cement slurry, CO2Gas
Body is equipped with air inlet 15 into mixing chamber 12 by being located at the shell 10 on 11 top of partition, completes cement slurry to CO2
Seal up for safekeeping and solidify.
Claims (4)
1. a kind of method for promoting fresh concrete absorbing carbon dioxide efficiency, it is characterised in that: in the stirring technique of concrete
Mill apparatus is stirred in middle introducing, and stirring mill apparatus is passed through CO for grinding to cement slurry2Gas realizes cement slurry
To CO2Seal up for safekeeping and solidify；By nano-calcium carbonate particles that the cement particle surface in cement slurry is generated and deposited and
When remove, so that cement granules is constantly exposed fresh surface；And abrasive action can be by cement granules aggregate and nano-calcium carbonate
The aggregate of calcium particle and cement granules is smashed in time.
2. a kind of method for promoting fresh concrete absorbing carbon dioxide efficiency according to claim 1, it is characterised in that:
The stirring mill apparatus, including shell (10), shell (10) one end are opening, and the other end is discharge port (30), and is pacified
Equipped with the partition (11) of mixing chamber (12) and storage bin (13) will be divided into inside shell (10)；Positioned at the partition (11) top
Shell (10) is equipped with air inlet (15), and the air inlet (15) is equipped with check valve (16)；It is placed in the mixing chamber (12)
There are several steel balls (14)；
The partition (11) is equipped with several holes, and pore diameter is less than the diameter of mixing chamber (12) interior steel ball (14), with
Prevent steel ball (14) from leaking into storage bin (13)；
It further include the top cover (20) for closing shell (10) opening, the top cover (20) is equipped with and is connected to inside shell (10)
Water inlet (17) and cement feed inlet (18), and the gas concentration lwevel for detecting shell (10) interior gas concentration lwevel
It counts (19)；Stirring motor (40) are installed on the top cover (20), and the helical blade (41) being mounted on motor (40).
3. a kind of method for promoting fresh concrete absorbing carbon dioxide efficiency according to claim 1, it is characterised in that:
The steel ball (14) is the steel ball (14) of diameter of differing in size, and pore diameter is less than mixing chamber on the partition (11)
(12) diameter of minimum steel ball (14) in.
4. a kind of method for promoting fresh concrete absorbing carbon dioxide efficiency according to claim 2, it is characterised in that:
Stirring mill apparatus is introduced in concrete stirring technology, is referred to and is prepared and grind according to the proportion of cement and water by stirring mill apparatus
Cement slurry is worn into, and is filled with CO into cement slurry2Gas, cement slurry is to CO2After sealing up for safekeeping and solidifying, flows into mixed mud and stir
It mixes in machine and aggregate and mineral admixture mixing concrete；Specific step is as follows:
1) calculated performance parameter: determining the single pot of amount of agitation and mixing time T of blender according to mixed mud blender performance parameter,
Determine the CO of every pot of cement consumption M and every pot of slurry according to concrete proportioning by single pot of amount of agitation again2Uptakem, then by water
Slurry body absorbs CO2Speedv, calculate the milling time that stirring mill apparatus prepares cement slurryt, in which:
；
2) feed: the cement of mass M is added in the cement feed inlet (18) by stirring mill apparatus, adds in proportion from water inlet (17)
Enter water, while starting stirring motor (40), mixing cement slurry；
3) it ventilates: in the CO for starting to store in advance while stirring2Gas is passed through in mixing chamber (12) by air inlet (15),
Utilize the CO in carbon dioxide concentration record mixing chamber (12)2Gas concentration, and maintain CO2Gas concentration；
4) stir: lasting stirring absorbed CO2The cement slurry of gas flows into storage bin (13) by partition (11), whipping process
In, every milling timetThe cement of a mass M is supplemented, and is proportionally added into water, supplements the cement slurry in mixing chamber；
5) it discharges: opening storage bin (13) discharge port every mixing time T, cement slurry is put into concrete mixer, from
And, circulation production synchronous with charging；
6) mixing concrete: mixed mud blender is utilized, then is proportionally added into aggregate and other mixed mud materials mixing coagulations
Soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811428829.6A CN109368642A (en) | 2018-11-27 | 2018-11-27 | A method of promoting fresh concrete absorbing carbon dioxide efficiency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811428829.6A CN109368642A (en) | 2018-11-27 | 2018-11-27 | A method of promoting fresh concrete absorbing carbon dioxide efficiency |
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| Publication Number | Publication Date |
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| CN109368642A true CN109368642A (en) | 2019-02-22 |
Family
ID=65383205
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Cited By (4)
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| CN110203932A (en) * | 2019-06-05 | 2019-09-06 | 东南大学 | A kind of device and preparation method of foam concrete solidified carbon dioxide |
| WO2022135714A1 (en) * | 2020-12-23 | 2022-06-30 | Bhs-Sonthofen Gmbh | Apparatus for producing co2-enriched concrete |
| CN114734533A (en) * | 2022-06-14 | 2022-07-12 | 福建南方路面机械股份有限公司 | Concrete stirring device and method for reinforcing carbon fixation |
| CN117003534A (en) * | 2023-07-31 | 2023-11-07 | 湖北工业大学 | Carbon sealing method and device for autoclaved aerated concrete products |
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| CN117003534A (en) * | 2023-07-31 | 2023-11-07 | 湖北工业大学 | Carbon sealing method and device for autoclaved aerated concrete products |
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