CN113185167B - Device and method for quickly carbonizing recycled fine aggregate by using nano carbon dioxide - Google Patents
Device and method for quickly carbonizing recycled fine aggregate by using nano carbon dioxide Download PDFInfo
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- CN113185167B CN113185167B CN202110491874.1A CN202110491874A CN113185167B CN 113185167 B CN113185167 B CN 113185167B CN 202110491874 A CN202110491874 A CN 202110491874A CN 113185167 B CN113185167 B CN 113185167B
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention provides a device for quickly carbonizing recycled fine aggregate by nano carbon dioxide, which is sequentially provided with a carbon dioxide processor, a nano carbon dioxide generator and a carbonization reaction mechanism along the input direction of the carbon dioxide, wherein the carbonization reaction mechanism is sequentially provided with a recycled fine aggregate conveyer, a carbonization reactor and a recycled fine aggregate recoverer along the input direction of the recycled fine aggregate. The invention further provides a method for quickly carbonizing recycled fine aggregate by using nano carbon dioxide. According to the device and the method for quickly carbonizing and regenerating the fine aggregate by using the nano carbon dioxide, provided by the invention, the carbonization reaction speed is accelerated, the turnover efficiency of materials is improved, and a large amount of cost can be saved; meanwhile, the nano carbon dioxide device for carbonization can absorb carbon dioxide in the air to generate nano carbon dioxide which reacts with the recycled fine aggregate more quickly, so that the greenhouse effect is relieved, and the device has a wide application prospect.
Description
Technical Field
The invention belongs to the technical field of building materials, and relates to a device and a method for quickly carbonizing recycled fine aggregate by using nano carbon dioxide.
Background
The conventional stacking treatment method of the building waste fine aggregate occupies a large amount of land and space, consumes a large amount of resources and also poses serious threat to the environment. Therefore, efficient recycling of waste fine aggregates is a problem to be solved. On the other hand, with the development of economic society, the demand of China for natural fine aggregate resources is high, and the natural fine aggregate resources are in a state of severe shortage at present.
Aiming at the utilization of recycled fine aggregate, the existing treatment and recycling method is mainly used as a road paving material. However, with the development of the economic society, the comprehensive performance of the recycled fine aggregate is improved, the recycling rate of the recycled fine aggregate is improved, the demand pressure of the market on the natural fine aggregate is relieved, and the method is an important way for realizing the efficient recycling of the waste fine aggregate at present.
Different from natural fine aggregate, a certain amount of old mortar is attached to the surface of the waste fine aggregate, and the physical and mechanical properties of the waste fine aggregate are seriously reduced. The performance of the aggregate can be improved by a fine aggregate surface mortar reinforcing or removing technology. On the other hand, the carbonization reaction can generate calcium carbonate with stable performance through the reaction of carbon dioxide and hydration products such as calcium hydroxide and calcium silicate hydrate, thereby effectively filling the micropores of the mortar and improving the density of the mortar and the bonding strength of the interface of the mortar and the fine aggregate. The carbonization reaction is therefore an effective way of improving the recycling of fine aggregates. Kou et al use carbonization to improve the properties of recycled fine aggregates (Kou S C, Zhan B J, Poon C. use ofa CO 2 curing step to improve the properties of concrete prepared with recycled aggregates[J]Cement and Concrete compositions 2014,45: 22-28). Meanwhile, Papadaikis et al found that the ordinary temperature carbonization rate was greatly influenced by the carbonization environment and that the reaction rate was slow (Papadaikis V G, Vayenas C G, Fardis MN. fundamental Modeling and Experimental Investigation of Concrete carbon [ J ]].Aci Material Journal,1991,88(4):363-373.)。
Currently, a series of researches are carried out on the problem of carbon dioxide fixation method worldwide, and a carbon sequestration project is already carried out in part of areas, and the effect of carbon dioxide sequestration is achieved by collecting carbon dioxide discharged from a factory, pressurizing and liquefying the carbon dioxide and injecting the carbon dioxide into the ground or the sea bottom through a pipeline (Hollowy S.Undergorged liquefaction of carbon dioxide-a movable greenhouse gas sequestration option [ J ]. Energy,2005,30(11/12): 2318-. However, this technique is costly in the early stages and risks carbon leakage (Phelps J J C, Black J C, Holt J T, et al. modeling large-scale CO2leakages in the North Sea [ J ]. International Journal of Greenhouse Gas Control,2015,38: 210-.
The carbon dioxide has low solubility in the aqueous solution, and the nano carbon dioxide bubbles are generated by the nano bubble device, so that the content of the carbon dioxide in the aqueous solution can be greatly improved. Meanwhile, compared with the bubbles with larger sizes of millimeter and micron, the nano carbon dioxide bubbles have stronger stability in water. Both internal and external factors that affect the carbonization reaction can have a large effect on it.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a device and a method for rapidly carbonizing and regenerating fine aggregate with nano carbon dioxide, which aims at the problems of shortage of natural fine aggregate resources, poor performance of regenerated fine aggregate, and slow carbonization modification reaction speed at normal temperature and pressure, and provides a device for rapidly carbonizing and regenerating fine aggregate with nano carbon dioxide, wherein nano carbon dioxide with a specific size is generated in an aqueous solution by a nano carbon dioxide generator, and a large amount of carbon dioxide rapidly enters into micropores of aggregate along with the aqueous solution in a manner of soaking the dry fine aggregate, so that the nano carbon dioxide with a large specific surface area is in full contact with a hydration product, and the carbonization reaction is rapidly generated. Meanwhile, the reaction speed is further increased by controlling the external temperature and pressure, so that the effect of quickly carbonizing and improving the performance of the regenerated fine aggregate is achieved.
In order to achieve the above and other related objects, a first aspect of the present invention provides an apparatus for rapidly carbonizing recycled fine aggregate with nano carbon dioxide, which is provided with a carbon dioxide processor, a nano carbon dioxide generator, and a carbonization reaction mechanism in sequence along a carbon dioxide input direction, wherein the carbonization reaction mechanism is provided with a recycled fine aggregate conveyer, a carbonization reactor, and a recycled fine aggregate recoverer in sequence along the recycled fine aggregate input direction.
Preferably, a temperature regulator and a pressure regulator are arranged outside the carbonization reactor.
Preferably, a stirrer is arranged in the carbonization reactor.
The second aspect of the invention provides a method for quickly carbonizing recycled fine aggregate by nano carbon dioxide, which comprises the following steps: and soaking the regenerated fine aggregate in an aqueous solution containing nano carbon dioxide to ensure that the nano carbon dioxide and hydration products in the regenerated fine aggregate are subjected to carbonization reaction to obtain carbonized regenerated fine aggregate.
According to the method, carbon dioxide is uniformly dispersed in liquid water in a nanoscale bubble mode through a nano carbon dioxide generator, the regenerated fine aggregate is soaked in an aqueous solution containing the nano carbon dioxide, the nano carbon dioxide entering the micropores of the regenerated fine aggregate and a hydration product in the regenerated fine aggregate are subjected to a carbonization reaction rapidly by changing the external temperature and pressure to obtain a corresponding carbonate precipitate, and the carbonate precipitate is filled into the gap inside the mortar, the surface structure defect position of the regenerated fine aggregate and a transition region between the mortar and the regenerated fine aggregate to improve the surface strength of the regenerated fine aggregate and obtain the carbonized regenerated fine aggregate with enhanced structural performance, so that the recycling efficiency of the waste fine aggregate is improved.
Preferably, the water content of the recycled fine aggregate is less than or equal to 20%. More preferably, the water content of the recycled fine aggregate is less than or equal to 3 percent.
Preferably, the diameter of the equivalent circle of the recycled fine aggregate is less than or equal to 5 mm. More preferably, the recycled fine aggregate has an equivalent circular diameter of 0.05 to 5 mm.
Preferably, the method adopts the device for quickly carbonizing the recycled fine aggregate by using the nano carbon dioxide, and comprises the following steps of:
1) carbon dioxide generated by the carbon dioxide processor is formed into aqueous solution containing nano carbon dioxide in the nano carbon dioxide generator and then is input into the carbonization reactor;
2) inputting the recycled fine aggregate into a carbonization reactor through a recycled fine aggregate conveyer, carrying out carbonization reaction with an aqueous solution containing nano carbon dioxide, and outputting the obtained carbonized recycled fine aggregate through a recycled fine aggregate recoverer.
More preferably, in step 1), the carbon dioxide processor is externally connected with a carbon dioxide source.
More preferably, in step 1), the concentration of carbon dioxide in the carbon dioxide processor is 1 to 100 vol%. Further preferably, the concentration of carbon dioxide in the carbon dioxide processor is 50 to 100 vol%.
More preferably, in step 1), the solvent used in the nano carbon dioxide generator is distilled water. The pH of the distilled water was 7.0.
More preferably, in step 1), the diameter of the bubble forming the nano carbon dioxide in the nano carbon dioxide generator is 1 to 100 nm.
Further preferably, the diameter of bubbles forming the nano carbon dioxide in the nano carbon dioxide generator is 1 to 30 nm.
More preferably, in the step 2), the pH of the nano carbon dioxide-containing aqueous solution in the carbonization reactor is in the range of 4.0 to 6.0. Further preferably, the pH of the nano carbon dioxide-containing aqueous solution in the carbonization reactor is in the range of 4.0 to 4.5.
More preferably, in the step 2), the temperature of the carbonization reactor is adjusted by a temperature adjuster, and the pressure of the carbonization reactor is adjusted by a pressure adjuster in the carbonization reaction.
Further preferably, the temperature control range of the temperature regulator is 0-100 ℃, and the temperature rise speed range is 0-10 ℃/min.
Still more preferably, the temperature control range of the temperature regulator is 20-80 ℃.
Most preferably, the temperature control range of the temperature regulator is 30-50 ℃.
Further preferably, the pressure control range of the pressure regulator is 0.1-0.5MPa, and the pressure increasing speed range is 0-0.5 MPa/min.
Most preferably, the pressure regulator has a pressure control range of 0.3-0.5 MPa.
As described above, the device and method for rapidly carbonizing recycled fine aggregate by using nano carbon dioxide provided by the invention have the following beneficial effects:
(1) the invention provides a device and a method for quickly carbonizing recycled fine aggregate by nano carbon dioxide, aiming at the problem that the existing recycled fine aggregate is accumulated in large quantity and cannot be timely absorbed, based on the recognition that the carbonization reaction degree in the recycled fine aggregate is small in the accumulation process, carbon dioxide is used as carbonization reaction gas, the carbon dioxide is uniformly dispersed into an aqueous solution in the form of nano bubbles through a nano carbon dioxide generating device, and a large amount of carbon dioxide is quickly sent into micropores of the recycled fine aggregate in the form of soaking the recycled fine aggregate in the aqueous solution containing nano carbon dioxide. And the carbonization reaction speed is further improved by adjusting the external pressure and temperature of the reaction. The treatment process is green, pollution-free, efficient and quick.
(2) The invention provides a device and a method for quickly carbonizing and regenerating fine aggregate by nano carbon dioxide, which are characterized in that carbon dioxide is uniformly dispersed in liquid water in a nano-scale bubble form, a nano carbon dioxide generating device can quickly generate an aqueous solution containing a large amount of nano carbon dioxide within a plurality of minutes, the pH value of the solution is reduced, and a large amount of carbon dioxide can be fed into micropores of the regenerated fine aggregate in a short time in a sample soaking mode. The carbonization reaction speed of the fine aggregate is improved, the performance of the recycled fine aggregate is improved efficiently, the turnover rate of the reacted fine aggregate is increased, and the cost is reduced.
(3) The device and the method for quickly carbonizing the recycled fine aggregate by using the nano carbon dioxide are suitable for multiple purposes, and comprise the steps of quickly carbonizing the recycled fine aggregate aiming at high-efficiency compound utilization and quickly absorbing and fixing the carbon dioxide in industrial waste gas aiming at relieving greenhouse effect; more broadly, the device can also be popularized to the process of fixing carbon in minerals containing calcium or magnesium elements based on the characteristic of generating carbonate with stable performance by reacting with carbon dioxide.
(4) The invention provides a device and a method for quickly carbonizing recycled fine aggregate by nano carbon dioxide, which are characterized in that the recycled fine aggregate is soaked in an aqueous solution containing micro bubbles of the nano carbon dioxide, so that a large amount of carbon dioxide quickly enters the micropores of the recycled fine aggregate along with the aqueous solution, the temperature and the pressure in a carbonization reactor are reasonably controlled, the dissolving and releasing speeds of the nano carbon dioxide in the microporous solution are adjusted, the nano carbon dioxide quickly reacts with a hydration product to generate calcium carbonate, the performance of the recycled aggregate can be effectively improved, and the high-efficiency compound utilization of the recycled fine aggregate and the quick absorption of the carbon dioxide are realized.
Drawings
FIG. 1 is a flow chart showing the structure of an apparatus for rapidly carbonizing recycled fine aggregate with nano carbon dioxide according to the present invention.
FIG. 2 is a graph showing the carbonization rate of the carbonized recycled fine aggregate No. 1 in example 1 of the present invention.
Fig. 3 is a graph showing a comparative carbonization rate of carbonized recycled fine aggregate 1# and carbonized recycled fine aggregate 1# in example 1 of the present invention.
FIG. 4 is a graph showing the carbonization rate of the carbonized recycled fine aggregate No. 2 in example 2 of the present invention.
Reference numerals
1 carbon dioxide processor
2 nanometer carbon dioxide generator
3 recycled fine aggregate conveyer
4 carbonization reactor
5 temperature regulator
6 pressure regulator
7 recycled fine aggregate recoverer
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 4. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms may be changed or adjusted without substantial change in the technical content.
The invention provides a device for rapidly carbonizing recycled fine aggregate by nano carbon dioxide, as shown in fig. 1, a carbon dioxide processor, a nano carbon dioxide generator and a carbonization reaction mechanism are sequentially arranged along the input direction of carbon dioxide, and the carbonization reaction mechanism is sequentially provided with a recycled fine aggregate conveyer, a carbonization reactor and a recycled fine aggregate recoverer along the input direction of the recycled fine aggregate.
In the device for rapidly carbonizing recycled fine aggregate by nano carbon dioxide, as shown in fig. 1, a temperature regulator and a pressure regulator are arranged outside the carbonization reactor.
In a specific embodiment, the temperature regulator is a conventionally used temperature regulator. Specifically, the thermostat is a Series 120R model thermostat manufactured by the baker Hotwatt company. The temperature regulator is used for regulating the temperature and the temperature rising speed of the carbonization reactor.
In a particular embodiment, the pressure regulator is a conventionally used pressure regulator. Specifically, the pressure regulator is a model LR-2B pressure regulator manufactured by Yamatoski corporation. The pressure regulator is used for regulating the pressure and the pressure increasing speed of the carbonization reactor.
In the device for rapidly carbonizing and regenerating the fine aggregate by using the nano carbon dioxide, the carbon dioxide processor is a conventionally used carbon dioxide processor. Specifically, the carbon dioxide processor is a New Cosmos Electric CO, model XP-3110-H2 manufactured by LTD. The carbon dioxide processor is externally connected with a carbon dioxide source and used for detecting and adjusting the concentration of the input carbon dioxide.
In the device for quickly carbonizing and regenerating the fine aggregate by using the nano carbon dioxide, the nano carbon dioxide generator is a conventionally used nano carbon dioxide generator. Specifically, the nano carbon dioxide generator is a nano carbon dioxide generator of MNBG model manufactured by Nanotech company. The nano carbon dioxide generator is used for converting the introduced carbon dioxide gas into carbon dioxide bubbles with nano scale.
In the above apparatus for rapid carbonization of recycled fine aggregate by nano carbon dioxide, the recycled fine aggregate conveyor is a conventionally used recycled fine aggregate conveying appliance. The recycled fine aggregate conveyer is used for conveying recycled fine aggregate to the carbonization reactor.
In the above apparatus for rapid carbonization of recycled fine aggregate by nano carbon dioxide, the carbonization reactor is a conventionally used carbonization reactor. Specifically, the carbonization reactor is HiClave produced by JUCHHEIM TM A model of a carbonization reactor. The carbonization reactor is used for providing a place for carbonization reaction.
In the device for quickly carbonizing the recycled fine aggregate by using the nano carbon dioxide, a stirrer is arranged in the carbonization reactor. The stirrer is a stirring paddle which is used conventionally. The stirrer is used for stirring in the carbonization reactor to promote the carbonization reaction.
In the device for quickly carbonizing the recycled fine aggregate by using the nano carbon dioxide, the recycled fine aggregate recoverer is a recycled fine aggregate recovery container which is used conventionally. The recycled fine aggregate recoverer is used for recovering recycled fine aggregates.
The invention provides a method for quickly carbonizing recycled fine aggregate by nano carbon dioxide, which comprises the following steps: and soaking the regenerated fine aggregate in an aqueous solution containing nano carbon dioxide to ensure that the nano carbon dioxide and hydration products in the regenerated fine aggregate are subjected to carbonization reaction to obtain carbonized regenerated fine aggregate.
Example 1
The concentration of carbon dioxide is detected and adjusted to 99.5 vol% in a carbon dioxide processor by an external carbon dioxide source. Then inputting the carbon dioxide into a nano carbon dioxide generator to generate carbon dioxide bubbles with the diameter range of 50-100nm in distilled water to form an aqueous solution containing nano carbon dioxide. After 5 minutes of input, the pH of the aqueous solution containing nanocarbon dioxide changed from 7.0 to 4.0. Then the water solution containing the nano carbon dioxide is input into a carbonization reactor. The pH of the aqueous solution containing nano carbon dioxide in the carbonization reactor was 4.0.
Passing recycled fine aggregate with water content of 0% and particle diameter of 0.3-1.18mm through a recycled fine aggregate conveyer at a ratio of 1dm 3 The raw materials are conveyed to a carbonization reactor at a min speed, soaked in an aqueous solution containing nano carbon dioxide, and subjected to carbonization reaction to obtain carbonized recycled fine aggregate No. 1. The carbonized recycled fine aggregate is output and recycled through a recycled fine aggregate recoverer. In the carbonization reaction, the temperature in the carbonization reactor was adjusted to 30 ℃ by a temperature regulator at a temperature rise rate of 1 ℃/min, and the pressure in the carbonization reactor was adjusted to 0.05MPa by a pressure regulator at a pressure rise rate of 0.01 MPa/min.
Example 2
The concentration of carbon dioxide is detected and adjusted to 99.5 vol% in a carbon dioxide processor by an external carbon dioxide source. Then inputting the carbon dioxide into a nano carbon dioxide generator to generate carbon dioxide bubbles with the diameter range of 20-80nm in distilled water to form an aqueous solution containing nano carbon dioxide. After 5 minutes of input, the pH of the aqueous solution containing nanocarbon dioxide changed from 7.0 to 4.0. Then inputting the water solution containing the nano carbon dioxide into a carbonization reactor. The pH of the aqueous solution containing nano carbon dioxide in the carbonization reactor was 4.0.
Passing recycled fine aggregate with water content of 0% and particle diameter of 0.15-0.6mm through a recycled fine aggregate conveyer at a ratio of 1dm 3 Delivering the mixture to a carbonization reactor at a speed of/min, soaking the mixture in an aqueous solution containing nano carbon dioxide, and carrying out carbonization reaction to obtain carbonized recycled fine aggregate No. 2. And (5) outputting and recycling the carbonized recycled fine aggregate through a recycled fine aggregate recoverer. In the carbonization reaction, the temperature in the carbonization reactor was adjusted to 30 ℃ by a temperature regulator at a temperature rise rate of 1 ℃/min, and the pressure in the carbonization reactor was adjusted to 0.5MPa by a pressure regulator at a pressure rise rate of 0.01 MPa/min.
Comparative example 1
Performing a carbonization reaction test on the recycled fine aggregate with the water content of 0% and the particle size of 0.3-1.18mm at normal temperature, wherein the temperature of carbon dioxide is 20 ℃, the pressure is 0.1MPa, and the ambient humidity is 65% to obtain carbonized recycled fine aggregate 1.
Comparative test example 1
The carbonized recycled fine aggregate 1# prepared in example 1, the carbonized recycled fine aggregate 2# prepared in example 2, and the carbonized recycled fine aggregate 1# prepared in comparative example 1 were subjected to thermogravimetric analysis test to measure the amount of calcium carbonate generated per unit sample in different time periods, and the degree of carbonization was calculated based on the following formula, and a sample carbonization speed curve was plotted based on the degree of carbonization and time, with the result of carbonizing the recycled fine aggregate 1# shown in fig. 2, the result of carbonizing the recycled fine aggregate 1# shown in fig. 3, and the result of carbonizing the recycled fine aggregate 2# shown in fig. 4.
As can be seen from fig. 2, the carbonized recycled fine aggregate No. 1 has a high carbonization reaction rate in the first 60min, but the reaction rate gradually decreases as the carbonization reaction proceeds, and the carbonization degree remains substantially unchanged when the reaction time reaches 3 hours, i.e., the recycled fine aggregate has been completely carbonized.
As can be seen from fig. 4, the carbonization reaction speed was fast within the first 30min, but the reaction speed gradually decreased as the carbonization reaction proceeded, and the carbonization degree remained substantially unchanged when the reaction time reached 2 hours, that is, the recycled fine aggregate had been completely carbonized.
As can be seen from fig. 3, the carbonized recycled fine aggregate 1 takes 3 days to complete the reaction at normal temperature and pressure.
As can be seen from the comparison, the method of the present invention greatly accelerates the carbonization reaction rate.
Example 3
The carbonized recycled fine aggregates 1# and 2# prepared in examples 1 and 2 were mixed with natural fine aggregates in a certain ratio, standard test pieces were prepared based on the national standard GB17671-1999 "cement mortar strength test method", mortar strength was measured after 28 days of curing, and the results are shown in tables 1 and 2, respectively. Wherein, the fine aggregate used by the natural rubber sand is all natural fine aggregate; in the recycled mortar with the mixing amount of 30 percent of non-carbonized recycled fine aggregate, the mixing proportion of the recycled fine aggregate is 30 weight percent; the recycled mortar with the blending amount of 30 percent of carbonized recycled fine aggregate is used as the fine aggregate, and the blending proportion of the carbonized recycled fine aggregate is 30wt percent.
Table 1: comparative table of influence of carbonized recycled fine aggregate prepared in example 1 on compressive strength of mortar
Table 2: comparative table of influence of carbonized recycled fine aggregate prepared in example 2 on compressive strength of mortar
As can be found from tables 1 and 2, the mortar of the carbonized recycled fine aggregate can effectively improve the strength grade of the mortar and is comparable to natural mortar. Meanwhile, compared with the fine aggregate prepared by normal-temperature carbonization, the carbonized recycled fine aggregate prepared by the accelerated carbonization method has better performance. Therefore, the invention can remarkably accelerate the reaction speed of the recycled fine aggregate and the carbon dioxide, effectively improve the performance of the recycled fine aggregate, improve the utilization efficiency of the recycled fine aggregate and achieve the aim of high-efficiency composite utilization of the solid recycled building by soaking the recycled fine aggregate in the aqueous solution containing the nano carbon dioxide.
In conclusion, the device and the method for quickly carbonizing and regenerating the fine aggregate by using the nano carbon dioxide, provided by the invention, have the advantages that the material turnover efficiency is improved by accelerating the carbonization reaction speed, and a large amount of cost can be saved; meanwhile, the nano carbon dioxide device for carbonization can absorb carbon dioxide in the air to generate nano carbon dioxide which can react with the recycled fine aggregate quickly, relieves the greenhouse effect and has wide application prospect. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A device for rapidly carbonizing recycled fine aggregate by nano carbon dioxide is characterized in that a carbon dioxide processor, a nano carbon dioxide generator and a carbonization reaction mechanism are sequentially arranged along the input direction of the carbon dioxide, and the carbonization reaction mechanism is sequentially provided with a recycled fine aggregate conveyer, a carbonization reactor and a recycled fine aggregate recoverer along the input direction of the recycled fine aggregate; a temperature regulator and a pressure regulator are arranged outside the carbonization reactor; a stirrer is arranged in the carbonization reactor.
2. A method for rapidly carbonizing recycled fine aggregate by nano carbon dioxide comprises the following steps: soaking the regenerated fine aggregate in an aqueous solution containing nano carbon dioxide to ensure that the nano carbon dioxide and hydration products in the regenerated fine aggregate are subjected to carbonization reaction to obtain carbonized regenerated fine aggregate;
the method adopts the device for rapidly carbonizing recycled fine aggregate by the nano carbon dioxide according to claim 1, and comprises the following steps:
1) carbon dioxide generated by the carbon dioxide processor is formed into aqueous solution containing nano carbon dioxide in the nano carbon dioxide generator and then is input into the carbonization reactor;
2) inputting the recycled fine aggregate into a carbonization reactor through a recycled fine aggregate conveyor, carrying out carbonization reaction with an aqueous solution containing nano carbon dioxide, and outputting the obtained carbonized recycled fine aggregate through a recycled fine aggregate recoverer.
3. The method for rapidly carbonizing recycled fine aggregate by using nano carbon dioxide as claimed in claim 2, wherein the water content of the recycled fine aggregate is less than or equal to 20%; the equivalent circle diameter of the recycled fine aggregate is less than or equal to 5 mm.
4. The method for rapidly carbonizing and recycling the fine aggregate by using the nano carbon dioxide according to claim 2, wherein in the step 1), the carbon dioxide processor is externally connected with a carbon dioxide source; the concentration of carbon dioxide in the carbon dioxide processor is 1-100 vol%.
5. The method for rapidly carbonizing and recycling fine aggregate by nano carbon dioxide according to claim 2, wherein in the step 1), the solvent adopted in the nano carbon dioxide generator is distilled water; the diameter of the bubbles forming the nano carbon dioxide in the nano carbon dioxide generator is 1-100 nm.
6. The method for rapidly carbonizing recycled fine aggregate by using nano carbon dioxide according to claim 2, wherein in the step 2), the pH of the aqueous solution containing nano carbon dioxide in the carbonization reactor is in a range of 4.0 to 6.0.
7. The method for rapidly carbonizing recycled fine aggregate by using nano carbon dioxide according to claim 2, wherein in the step 2), the temperature of the carbonization reactor is adjusted by a temperature adjuster, and the pressure of the carbonization reactor is adjusted by a pressure adjuster during the carbonization reaction; the temperature control range of the temperature regulator is 0-100 ℃, and the temperature rise speed range is 0-10 ℃/min; the pressure control range of the pressure regulator is 0.1-0.5MPa, and the pressure increasing speed range is 0-0.5 MPa/min.
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