Carbon sequestration strengthening device and method for regenerating red brick aggregate
The method of generating a calcium carbonate layer by soaking in lime water and reacting with carbon dioxide solves the problems of high cost and poor performance in the preparation of recycled red brick aggregate, and achieves low-cost and high-efficiency carbon emission reduction and performance improvement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BCEG RESOURCES RECYCLING CO LTD
- Filing Date
- 2023-09-21
- Publication Date
- 2026-07-14
Smart Images
Figure CN117466564B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of construction waste aggregate recycling technology, specifically to a carbon sequestration and enhancement device and method for recycled red brick aggregate. Background Technology
[0002] In recent years, with the acceleration of urban construction and renovation, the problems of construction waste pollution and garbage surrounding cities have become increasingly prominent. Therefore, the resource utilization of construction waste is an inevitable requirement for sustainable urban development. Construction waste can be processed into recycled aggregates through processes such as sorting, crushing, and screening. Recycled concrete aggregates made from waste concrete bricks have slightly lower performance than natural aggregates, but can replace natural aggregates in most fields to produce recycled products.
[0003] However, in reality, concrete made directly from recycled red brick aggregate (made from waste red bricks) fails to meet ideal performance standards in terms of strength and impermeability, showing a significant performance gap compared to concrete made with natural aggregates. Research analysis reveals that this is primarily due to the high water absorption rate of recycled aggregates, caused by their numerous cracks and pores. Once incorporated into concrete, recycled aggregates strongly absorb moisture from the cementitious material at their cross-sections, leading to insufficient hydration of the cement and the inability to generate sufficient hydration products. This results in a weak interface between the recycled aggregate and the concrete matrix, making the concrete prone to cracking under load. Furthermore, the numerous pores and channels at the interface, combined with the inherent cracks and pores in the recycled aggregate, provide ample diffusion and migration pathways for water and chloride ions, further contributing to insufficient impermeability. This not only easily corrodes the reinforcing steel in the concrete (e.g., the high chloride ions in seawater can severely corrode steel reinforcement), but also makes the concrete susceptible to freeze-thaw damage. Therefore, enhancing the performance of recycled aggregates is crucial for the overall resource utilization of construction waste.
[0004] In existing technologies, liquid water glass is often used to impregnate recycled aggregates. The water glass reacts with calcium hydroxide, a cement hydration product on the surface of the recycled aggregates, to generate calcium silicate colloid, which fills the pores of the recycled aggregates, thereby improving their density. For example, Chinese patent CN116444236B discloses a high-strength, high-permeability recycled aggregate concrete material. This material uses a mixture of glass powder, water glass, tricalcium silicate, and ethanol containing a small amount of water. After curing, a modified slurry is formed. This modified slurry is then coated onto the surface of the recycled aggregates and sintered. Short-term curing allows a small portion of the tricalcium silicate to undergo a hydration reaction with the water provided by the ethanol, forming a gelling hydration product. This increases the adhesion between the modified slurry and the recycled aggregate concrete. Furthermore, sintering melts the glass powder, which then penetrates into the pores and cracks on the surface of the recycled aggregates, sealing these pores and cracks while simultaneously forming a dense and firmly bonded glass coating layer. In the aforementioned prior art, although the hydration products fill the pores and cracks on the surface of the recycled aggregate and form a glass coating layer, the aforementioned prior art has the following problems when used in the preparation process of recycled red brick aggregate: the water glass required to prepare the modified slurry is sodium silicate, which is relatively expensive, resulting in a high production cost of recycled red brick aggregate; in addition, recycled red brick aggregate is not recycled concrete aggregate, and red brick production is clay sintering without the need to add cement, so there is no calcium hydroxide on the surface of the red brick aggregate, and it cannot react with water glass to form calcium silicate.
[0005] Existing technologies also frequently utilize nanomaterials in concrete structures, effectively improving the mechanical properties of concrete. For example, CN112239339A discloses a method for improving carbon fiber recycled concrete using nano-silica, which fills the internal pores of recycled aggregate with nano-silica to enhance the compressive strength of the carbon fiber recycled concrete. Another example is CN111875301A, which discloses a nano-strengthening method for recycled aggregate concrete and the resulting strengthened recycled aggregate. This nano-strengthening method improves and strengthens the interfacial strength between recycled aggregate and cement mortar through a secondary mixing process and fly ash materials. However, whether using water glass or composites of nanomaterials with other admixtures to enhance the performance of recycled concrete, the materials are relatively expensive, and the processes are complex.
[0006] Climate change is a global problem facing humanity. With the surge in carbon dioxide emissions, greenhouse gases are threatening ecosystems. If we can innovatively combine the performance enhancement of recycled red brick aggregates with the reduction and utilization of carbon dioxide emissions, it will bring huge economic, social and environmental benefits, which is of great significance.
[0007] Therefore, there is an urgent need to provide a device and method suitable for the preparation of recycled red brick aggregate that can ensure the mechanical properties of recycled red brick aggregate, promote carbon emission reduction, and is low in cost and simple in manufacturing process. Summary of the Invention
[0008] The present invention aims to provide a carbon fixation and strengthening device and method for recycled red brick aggregate to overcome the shortcomings of the prior art. The technical problem to be solved by the present invention is achieved through the following technical solution.
[0009] A carbon fixation and strengthening device for recycled red brick aggregate includes a lime water storage device, a reaction device, a carbonization device, a drying device, and an electrical control device. The lime water storage device includes a lime water storage tank. The reaction device includes a base, a swaying device, and a reaction chamber. The swaying device is located at the upper end of the base and is used to drive the reaction chamber to sway left and right. The lime water storage device is connected to the reaction chamber and is used to supply lime water to the reaction chamber and to recover the limestone after reaction in the reaction chamber. The carbonization device includes a conveying device I and a carbonization chamber. The conveying device I is located below the right port of the reaction chamber and is used to convey the recycled red brick aggregate from the reaction chamber to the carbonization chamber. The carbonization chamber is used to contain the recycled red brick aggregate and carbon dioxide gas to allow the recycled red brick aggregate to undergo a carbonization reaction with the carbon dioxide gas. The drying device is used to dry the recycled red brick aggregate from the carbonization chamber. The electrical control device is electrically connected to the lime water storage device, the swaying device, and the conveying device I.
[0010] Preferably, the reaction chamber includes a left chamber, a middle chamber, and a right chamber. The middle chamber is located at the upper end of the swing device. The left chamber and the middle chamber are located on the left and right sides of the middle chamber, respectively, and are connected to the middle chamber. A filter screen is provided between the middle chamber and the left chamber. A feeding port is provided at the top of the middle chamber. A door that can be opened and closed is provided at the feeding port. A valve I is provided at the right end of the right chamber's discharge port. The conveying device I is located below the valve I.
[0011] Preferably, the lime water storage device includes a lime water storage tank and a lime water recovery tank, which are respectively connected to the left compartment; the lime water storage tank is detachably connected to the upper end of the left compartment, a pump and a switch valve I are provided in the passage between the lime water storage tank and the left compartment, the pump is electrically connected to the electrical control device, the lime water recovery tank is detachably connected to the bottom end of the left compartment, and a switch valve II is provided between the lime water recovery tank and the left compartment.
[0012] Preferably, the carbonization chamber is connected to the carbon dioxide storage device, and a switch valve III is provided in the passage between the carbon dioxide storage device and the carbonization chamber. Valves II and III are respectively provided at the upper inlet and the lower outlet of the carbonization chamber, and the drying device is located below the valve III.
[0013] Preferably, the drying device includes a conveying device II and a drying chamber. The conveying device II is located below the carbonization chamber and is electrically connected to the electrical control device. The electrical control device controls the conveying device II to convey the recycled red brick aggregate from the carbonization chamber to the drying chamber. The drying chamber has an opening at the top and a valve IV at the discharge port at the bottom.
[0014] Preferably, the drying chamber is made of transparent material and has ventilation windows on its side walls.
[0015] The present invention also provides a method for carbon fixation enhancement of recycled red brick aggregate, which is prepared by any of the aforementioned apparatus and includes the following steps:
[0016] Step 1: Prepare saturated lime water; prepare saturated lime water and store it in a lime water storage tank;
[0017] Step 2: Soak the recycled red brick aggregate in lime water; add the recycled red brick aggregate to the middle chamber of the reaction chamber, supply saturated lime water from the lime water storage tank into the reaction chamber, and start the swing device to swing the reaction chamber so that the lime water fully soaks the recycled red brick aggregate.
[0018] Step 3: Drain excess lime water; drain the remaining lime water in the reaction chamber into the lime water recovery tank;
[0019] Step 4, Carbon Fixation: Adjust the angle of the reaction chamber using the swaying device so that the height of the right side of the reaction chamber is lower than that of the left side. Open valve I at the right end of the reaction chamber to allow the recycled red brick aggregate soaked in lime water to be poured onto the conveying device I of the carbonization device. Open valve II at the top of the carbonization chamber to transport the recycled red brick aggregate into the carbonization chamber through the conveying device I. Close valve II at the top of the carbonization chamber and introduce a certain amount of carbon dioxide gas into the carbonization chamber. Stop introducing carbon dioxide gas into the carbonization chamber after the carbon dioxide gas has filled the chamber. The recycled red brick aggregate in the carbonization chamber is then fumigated using carbon dioxide gas.
[0020] Step 5, airing; After fumigation is complete, open valve III at the bottom of the carbonization chamber, so that the recycled red brick aggregate fumigated by carbon dioxide in the carbonization chamber is poured onto the conveying device II of the airing device, and the recycled red brick aggregate is transported into the airing chamber for airing through the conveying device II.
[0021] Step 6, Collection: Open valve IV at the discharge port at the bottom of the drying silo to discharge the dried recycled red brick aggregate, and collect the recycled red brick aggregate for later use.
[0022] Preferably, in step two, the recycled red brick aggregate is poured into the middle silo from the feed inlet at the top of the middle silo until the height of the recycled red brick aggregate is half the height of the middle silo and the right silo; lime water is introduced into the left silo until the lime water submerges the recycled red brick aggregate; the shaking device drives the reaction silo to shake for 20 minutes.
[0023] Preferably, in step four, the recycled red brick aggregate is conveyed to the carbonization chamber by the conveying device I until the height of the recycled red brick aggregate is / of the height of the carbonization chamber and then the conveying stops; the time for the recycled red brick aggregate to be fumigated in the carbonization chamber is 24 hours.
[0024] Preferably, in step five, the recycled red brick aggregate is conveyed to the drying silo by the conveying device II until the height of the recycled red brick aggregate is / of the height of the drying silo, and then the conveying stops; the recycled red brick aggregate is dried in the drying silo for 24 hours.
[0025] In this invention, a certain amount of recycled red brick aggregate is poured into the reaction chamber. A prepared saturated lime water is stored and transported to the reaction chamber via a lime water storage device. The reaction chamber is then agitated by a shaking device to ensure the lime water fully soaks the recycled red brick aggregate. The lime water, composed of calcium hydroxide, fills the surface and pores of the recycled red brick aggregate with calcium hydroxide. The lime water-soaked aggregate is then transported to a carbonation chamber via a conveying device I. Any remaining lime water in the reaction chamber is recycled back to the lime water storage device, where it is removed of impurities and re-mixed for reuse. In the carbonation chamber, the recycled red brick aggregate undergoes a carbonation reaction with carbon dioxide gas, where the calcium hydroxide on the surface and in the pores reacts with carbon dioxide to produce calcium carbonate and water. After carbon dioxide fumigation, the recycled red brick aggregate is then transported to a drying device for natural drying. The dried aggregate is filled with calcium carbonate, thus improving its mechanical properties. The carbonized recycled red brick aggregate is collected for subsequent use.
[0026] This invention provides a carbon fixation and strengthening device and method for recycled red brick aggregate. It uses quicklime as the carbon fixation and strengthening carrier, replacing expensive materials such as water glass used in existing technologies. This significantly reduces costs and is more suitable for the preparation of recycled red brick aggregate. Furthermore, the carbon fixation process utilizes a large amount of carbon dioxide, ensuring its full utilization and greatly reducing carbon emissions. The preparation of recycled red brick aggregate using this device requires only three steps: lime water soaking, carbon dioxide fumigation and carbon fixation, and natural drying, making the process simple. This invention offers the advantages of low cost, efficient carbon emission reduction, and a simple manufacturing process. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the carbon fixation and strengthening device for recycled red brick aggregate in this invention.
[0028] The reference numerals in the attached figures are as follows: 11, lime water storage tank; 12, pump; 13, switch valve I; 14, switch valve II; 15, lime water recovery tank; 2, reaction device; 21, base; 22, swing device; 23, middle chamber; 24, left chamber; 25, right chamber; 26, filter screen; 27, valve I; 31, conveying device I; 32, carbonization chamber; 33, switch valve III; 34, carbon dioxide storage device; 35, valve II; 36, valve III; 41, conveying device II; 42, drying chamber; 43, exhaust window; 44, valve IV. Detailed Implementation
[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0030] Example 1:
[0031] Reference Figure 1 As shown, a carbon sequestration and strengthening device for recycled red brick aggregate is improved in that it includes a lime water storage device, a reaction device 2, a carbonization device, a drying device, and an electrical control device. The lime water storage device includes a lime water storage tank 11, and the reaction device 2 includes a base 21, a swaying device 22, and a reaction chamber. The swaying device 22 is located at the upper end of the base 21 and is used to drive the reaction chamber to sway left and right. The lime water storage device is connected to the reaction chamber and is used to supply lime water into the reaction chamber and to recover the limestone after reaction in the reaction chamber. The carbonization device includes a conveying device I31 and a carbonization chamber 32. The conveying device I31 is located below the right port of the reaction chamber and is used to convey the recycled red brick aggregate from the reaction chamber to the carbonization chamber 32. The carbonization chamber 32 is used to contain the recycled red brick aggregate and carbon dioxide gas so that the recycled red brick aggregate and carbon dioxide gas can undergo a carbonization reaction. The drying device is used to dry the recycled red brick aggregate from the carbonization chamber 32. The electrical control device is electrically connected to the lime water storage device, the swing device 22 and the conveying device I31 respectively.
[0032] In this embodiment, a certain amount of recycled red brick aggregate is poured into the reaction chamber. A prepared saturated lime water is stored and transported to the reaction chamber via a lime water storage device. The reaction chamber is then swung by a swaying device 22 to ensure the recycled red brick aggregate is fully soaked in the lime water, which is composed of calcium hydroxide. This ensures the surface and pores of the recycled red brick aggregate are filled with calcium hydroxide. The lime water-soaked aggregate is then transported to a carbonation chamber 32 via a conveying device 131. Any remaining lime water in the reaction chamber is recycled back to the lime water storage device. After impurity removal and re-mixing, the lime water can be reused. The recycled red brick aggregate undergoes a carbonation reaction with carbon dioxide gas in the carbonation chamber 32. Specifically, the calcium hydroxide on the surface and in the pores of the recycled red brick aggregate reacts with carbon dioxide to produce calcium carbonate and water. After carbon dioxide fumigation, the recycled red brick aggregate is then transported to a drying device for natural drying. The dried aggregate is filled with calcium carbonate, thus improving its mechanical properties. The carbonized recycled red brick aggregate is collected for subsequent use.
[0033] This embodiment provides a carbon fixation and strengthening device for recycled red brick aggregate. It uses quicklime as the carbon fixation and strengthening carrier, replacing more expensive materials such as water glass used in existing technologies. This significantly reduces costs and makes it more suitable for the preparation of recycled red brick aggregate. The carbon fixation process uses a large amount of carbon dioxide, ensuring its full utilization and greatly reducing carbon emissions. The preparation of recycled red brick aggregate using this device requires only three steps: lime water soaking, carbon dioxide fumigation and carbon fixation, and natural drying. The manufacturing process is simple. This embodiment offers the advantages of low cost, efficient carbon emission reduction, and a simple manufacturing process.
[0034] Example 2:
[0035] Based on Example 1, the reaction chamber includes a left chamber 24, a middle chamber 23, and a right chamber 25. The middle chamber 23 is located at the upper end of the swing device 22. The left chamber 24 and the middle chamber 23 are located on the left and right sides of the middle chamber 23, respectively, and are connected to the middle chamber 23. A filter screen 26 is provided between the middle chamber 23 and the left chamber 24. A feeding port is provided at the top of the middle chamber 23, and a door that can be opened and closed is provided at the feeding port. A valve I27 is provided at the right end of the discharge port of the right chamber 25, and the conveying device I is located below the valve I27.
[0036] Furthermore, the lime water storage device includes a lime water storage tank 11 and a lime water recovery tank 15, which are respectively connected to the left compartment 24. The lime water storage tank 11 is detachably connected to the upper end of the left compartment 24. A pump 12 and a switch valve I13 are provided in the passage between the lime water storage tank 11 and the left compartment 24. The pump 12 is electrically connected to the electrical control device. The lime water recovery tank 15 is detachably connected to the bottom end of the left compartment 24, and a switch valve II14 is provided between the lime water recovery tank 15 and the left compartment 24.
[0037] Furthermore, the bottom of the left compartment 24 is tilted to the lower left, and the lime water recycling box 15 is detachably connected to the lowest point of the bottom of the left compartment 24.
[0038] Furthermore, the bottom of the right compartment 25 slopes downward to the right.
[0039] In this embodiment, during operation, the top door of the middle chamber 23 is opened, and a certain amount of recycled red brick aggregate is poured in. The middle chamber 23 is connected to the right chamber 25. The recycled red brick aggregate is poured until it reaches 2 / 3 of the height of the middle chamber 23 and the right chamber 25. The pouring of the recycled red brick aggregate is stopped, and the door is closed. The pump 12 is controlled by the electronic control device to pump the saturated lime water in the lime water storage tank 11 into the left chamber 24 from the top. After the lime water completely submerges the recycled red brick aggregate in the middle chamber 23 and the right chamber 25, the pump 12 is stopped by the electronic control device, the switch valve I13 is closed to cut off the passage between the lime water storage tank 11 and the left chamber 24, and then the pipeline connecting the lime water storage tank 11 and the left chamber 24 is disconnected. At this time, the lime water recovery tank 15 is disconnected from the left chamber 24. The electronic control device is started to control the swing device 22 to swing left and right so that the lime water can fully soak the recycled red brick aggregate during the swinging and oscillation of the reaction chamber. The swinging and oscillation is stopped after 20 minutes by the swing device 22. The tilt angle of the reaction chamber is adjusted by the swing device 22 so that the height of the left chamber 24 is lower than that of the right chamber 25. Then, the lime water recovery tank 15 is connected to the left chamber 24, and the switch valve II14 between the lime water recovery tank 15 and the left chamber 24 is opened to drain the remaining lime water in the reaction chamber. A filter screen 26 is provided between the left chamber 24 and the middle chamber 23. The filter screen 26 is a 1mm*1mm steel filter screen to prevent the recycled red brick aggregate in the middle chamber 23 from entering the left chamber 24, so that the remaining lime water after soaking can be recycled back to the lime water recovery tank 15. After the lime water in the reaction chamber is drained, the switch valve II14 is closed, and the pipeline between the lime water recovery tank 15 and the left chamber 24 is disconnected. The lime water in the lime water recovery tank 15 can be filtered, re-mixed to a saturated concentration, and added back to the carbon dioxide storage device 11 for reuse, which saves more resources. The tilt angle of the reaction chamber is controlled by an electronic control device so that the height of the right chamber 25 is lower than that of the left chamber 24. Valve I27 is opened to pour the recycled red brick aggregate soaked in lime water onto the conveying device I31. Valve II35 at the top of the carbonization chamber 32 is opened, and the conveying device I31 is controlled by the electronic control device to transport the recycled red brick aggregate into the carbonization chamber 32 until the height of the recycled red brick aggregate reaches 2 / 3 of the height of the carbonization chamber 32. Then the conveying device I31 stops working and valve II35 is closed.
[0040] Furthermore, the carbonization chamber 32 is connected to the carbon dioxide storage device 34, and a switch valve III33 is provided in the passage between the carbon dioxide storage device 34 and the carbonization chamber 32. Valves II35 and III36 are respectively provided at the upper inlet and the lower outlet of the carbonization chamber 32, and the drying device is located below the valve III36.
[0041] In this embodiment, carbon dioxide gas is introduced into the carbonization chamber 32 through the carbon dioxide storage device 34. The carbonization chamber 32 is equipped with a pressure sensor. After the pressure sensor detects that the carbonization chamber 32 has reached a certain pressure value, that is, the carbon dioxide has filled the carbonization chamber 32, the switch valve II33 and valve II35 are closed so that the carbon dioxide can fully react with the calcium hydroxide on the surface and in the pores of the recycled red brick aggregate. During the reaction process, if the pressure sensor detects that the pressure in the carbonization chamber 32 is lower than a certain value, the switch valve II33 can be opened again to continue to replenish the carbon dioxide gas into the carbonization chamber 32.
[0042] Furthermore, the drying device includes a conveying device II41 and a drying chamber 42. The conveying device II41 is located below the carbonization chamber 32 and is electrically connected to the electrical control device. The electrical control device controls the conveying device II41 to convey the recycled red brick aggregate from the carbonization chamber 32 into the drying chamber 42. The drying chamber 42 has an opening at the top and a valve IV44 at the bottom outlet.
[0043] Furthermore, the drying chamber 42 is made of transparent material and has exhaust windows 43 on its side walls.
[0044] Furthermore, the exhaust window 43 is a 1mm*1mm steel mesh.
[0045] In this embodiment, after the carbonization reaction has lasted 24 hours, valve III36 at the lower end of the carbonization chamber 32 is opened to discharge the recycled red brick aggregate onto the conveying device II41, and then valve III36 is closed. The conveying device II41 is controlled by an electronic control device to transport the recycled red brick aggregate into the drying chamber 42 until the height of the recycled red brick aggregate reaches 2 / 3 of the height of the drying chamber 42, at which point the conveying device II41 stops transporting. The drying chamber 42 is made of transparent material, allowing it to receive ample natural sunlight. The upper end of the drying chamber 42 is open, and the side wall is equipped with exhaust windows 43 to facilitate the rapid evaporation and discharge of moisture from the recycled red brick aggregate. After the recycled red brick aggregate has been naturally dried in the drying chamber 42 for 24 hours, valve IV44 at the lower end of the drying chamber 42 is opened to collect the recycled red brick aggregate for subsequent use.
[0046] Example 3:
[0047] An improved method for carbon fixation enhancement of recycled red brick aggregate, comprising the following steps: preparation using the apparatus described in Example 1 or 2.
[0048] Step 1: Prepare saturated lime water; prepare saturated lime water and store it in lime water storage tank 11;
[0049] Step 2: Soak the recycled red brick aggregate in lime water. Open the top door of the middle chamber 23 and pour in a certain amount of recycled red brick aggregate. Connect the middle chamber 23 to the right chamber 25, ensuring the recycled red brick aggregate reaches 2 / 3 of the height of the middle chamber 23 and the right chamber 25. Close the door. Pump 12 to pump saturated lime water from the lime water storage tank 11 into the left chamber 24 from the top. After the lime water completely submerges the recycled red brick aggregate in the middle chamber 23 and the right chamber 25, stop pump 12 using the electrical control device. Close the switch valve I13 to cut off the passage between the lime water storage tank 11 and the left chamber 24. Then, disconnect the pipeline connecting the lime water storage tank 11 and the left chamber 24. At this time, the lime water recovery tank 15 is disconnected from the left chamber 24. Start the electrical control device to control the swing device 22 to swing left and right, so that the lime water can fully soak the recycled red brick aggregate during the swinging and oscillation process in the reaction chamber. Stop swinging after 20 minutes using the swing device 22.
[0050] Step 3: Drain excess lime water; Adjust the tilt angle of the reaction chamber using the swing device 22 so that the height of the left chamber 24 is lower than the height of the right chamber 25. Then connect the lime water recovery tank 15 to the left chamber 24, open the switch valve II14 between the lime water recovery tank 15 and the left chamber 24, and drain the remaining lime water in the reaction chamber into the lime water recovery tank 15. After the lime water in the reaction chamber is drained, close the switch valve II14 and disconnect the pipeline between the lime water recovery tank 15 and the left chamber 24.
[0051] Step 4, carbonization; control the tilt angle of the reaction chamber using an electronic control device so that the height of the right chamber 25 is lower than the height of the left chamber 24; open valve I27 to pour the recycled red brick aggregate soaked in lime water onto the conveying device I31; open valve II35 at the upper end of the carbonization chamber 32; and control the conveying device I31 to transport the recycled red brick aggregate into the carbonization chamber 32 using the electronic control device until the height of the recycled red brick aggregate reaches 2 / 3 of the height of the carbonization chamber 32. Then, the conveying device I31 stops working, and valve II35 is closed. Carbon dioxide storage device 34 introduces carbon dioxide gas into carbonization chamber 32. Carbonization chamber 32 is equipped with a pressure sensor. When the pressure sensor detects that the carbonization chamber 32 has reached a certain pressure value, that is, when the carbon dioxide is full, the switch valve II33 and valve II35 are closed to allow the carbon dioxide to fully react with the calcium hydroxide on the surface and in the pores of the recycled red brick aggregate. During the reaction process, if the pressure sensor detects that the pressure in the carbonization chamber 32 is lower than a certain value, the switch valve II33 can be opened again to continue to replenish carbon dioxide gas into the carbonization chamber 32.
[0052] Step 5, airing; After fumigation is complete, open valve III36 at the lower end of carbonization chamber 32, so that the recycled red brick aggregate fumigated by carbon dioxide in carbonization chamber 32 is poured onto conveying device II41 of the airing device, and the recycled red brick aggregate is conveyed into airing chamber 42 through conveying device II41 for airing.
[0053] Step 6, collection; open valve IV44 at the discharge port at the lower end of the drying chamber 42 to discharge the dried recycled red brick aggregate, and collect the recycled red brick aggregate for subsequent use.
[0054] This embodiment provides a carbon fixation and strengthening method for recycled red brick aggregate. Quicklime is used as the carbon fixation and strengthening carrier, replacing more expensive materials such as water glass in existing technologies. This method is inexpensive, effectively reducing costs and is more suitable for the preparation of recycled red brick aggregate. The carbon fixation process uses a large amount of carbon dioxide, ensuring its full utilization and significantly reducing carbon emissions. The process only requires three main steps: lime water soaking, carbon dioxide fumigation and carbon fixation, and natural drying, making the manufacturing process simple. This embodiment offers the advantages of low cost, efficient carbon emission reduction, and a simple manufacturing process.
[0055] It should be noted that the above detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments described in this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0057] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.
[0058] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.
[0059] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.
[0060] In the detailed description above, reference has been made to the accompanying drawings, which form part of this document. In the drawings, similar symbols typically identify similar parts unless the context otherwise indicates otherwise. The illustrated embodiments described in the detailed specification, drawings, and claims are not intended to be limiting. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the subject matter presented herein.
[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A carbon fixation and strengthening device for recycled red brick aggregate, characterized in that: The device includes a lime water storage device, a reaction device (2), a carbonization device, a drying device, and an electrical control device. The lime water storage device includes a lime water storage tank (11). The reaction device (2) includes a base (21), a swaying device (22), and a reaction chamber. The swaying device (22) is located at the upper end of the base (21) and is used to drive the reaction chamber to sway left and right. The lime water storage device is connected to the reaction chamber and is used to supply lime water to the reaction chamber so that the lime water can fully soak the recycled red brick aggregate, so that the surface and pores of the recycled red brick aggregate are filled with calcium hydroxide, and to recycle the lime water after the reaction in the reaction chamber. The carbonization device includes a conveying device I (31) and a carbonization chamber (32). The conveying device I (31) is located below the right port of the reaction chamber and is used to convey the recycled red brick aggregate from the reaction chamber to the carbonization chamber (32). The carbonization chamber (32) is used to contain the recycled red brick aggregate and Carbon dioxide gas is used to cause the recycled red brick aggregate to undergo a carbonization reaction with the carbon dioxide gas; the reaction chamber includes a left chamber (24), a middle chamber (23) and a right chamber (25). The middle chamber (23) is located at the upper end of the swing device (22). The left chamber (24) and the right chamber (25) are located on the left and right sides of the middle chamber (23) and are respectively connected to the middle chamber (23). A filter screen (26) is provided between the middle chamber (23) and the left chamber (24). A feeding port is provided at the top of the middle chamber (23). A door that can be opened and closed is provided at the feeding port. A valve I (27) is provided at the right end of the discharge port of the right chamber (25). The conveying device I (31) is located below the valve I (27). The drying device is used to dry the recycled red brick aggregate from the carbonization chamber (32). The electrical control device is electrically connected to the lime water storage device, the swing device (22) and the conveying device I (31).
2. The carbon fixation and strengthening device for recycled red brick aggregate according to claim 1, characterized in that: The lime water storage device includes a lime water storage tank (11) and a lime water recovery tank (15). The lime water storage tank (11) and the lime water recovery tank (15) are respectively connected to the left compartment (24). The lime water storage tank (11) is detachably connected to the upper end of the left compartment (24). A pump (12) and a switch valve I (13) are provided in the passage between the lime water storage tank (11) and the left compartment (24). The pump (12) is electrically connected to the electrical control device. The lime water recovery tank (15) is detachably connected to the bottom end of the left compartment (24). A switch valve II (14) is provided between the lime water recovery tank (15) and the left compartment (24).
3. The carbon fixation and strengthening device for recycled red brick aggregate according to claim 1, characterized in that: The carbonization chamber (32) is connected to the carbon dioxide storage device (34). A switch valve III (33) is provided in the passage between the carbon dioxide storage device (34) and the carbonization chamber (32). Valves II (35) and III (36) are provided at the upper feed inlet and the lower discharge outlet of the carbonization chamber (32), respectively. The drying device is located below the valve III (36).
4. The carbon fixation and strengthening device for recycled red brick aggregate according to claim 1, characterized in that: The drying device includes a conveying device II (41) and a drying bin (42). The conveying device II (41) is located below the carbonization bin (32) and is electrically connected to the electrical control device. The electrical control device controls the conveying device II (41) to convey the recycled red brick aggregate from the carbonization bin (32) into the drying bin (42). The drying bin (42) has an opening at the top and a valve IV (44) at the bottom outlet.
5. The carbon fixation and strengthening device for recycled red brick aggregate according to claim 4, characterized in that: The drying chamber (42) is made of transparent material and has ventilation windows (43) on its side walls.
6. A method for carbon sequestration and strengthening of recycled red brick aggregate, characterized in that: The preparation using the apparatus according to any one of claims 1-5 includes the following steps: Step 1: Prepare saturated lime water; prepare saturated lime water and store it in lime water storage tank (11); Step 2: Soak the recycled red brick aggregate in lime water; add the recycled red brick aggregate into the middle chamber (23) of the reaction chamber, supply saturated lime water from the lime water storage tank (11) into the reaction chamber, and start the swing device (22) to swing the reaction chamber so that the lime water can fully soak the recycled red brick aggregate. Step 3: Drain excess lime water; drain the remaining lime water in the reaction chamber into the lime water recovery tank (15); Step 4, carbon fixation; adjust the angle of the reaction chamber by using the swing device (22) so that the height of the right side of the reaction chamber is lower than that of the left side, open the valve I (27) at the right end of the reaction chamber so that the recycled red brick aggregate soaked in lime water is poured onto the conveying device I (31) of the carbonization device, open the valve II (35) at the top of the carbonization chamber (32), and convey the recycled red brick aggregate into the carbonization chamber (32) through the conveying device I (31), close the valve II (35) at the top of the carbonization chamber (32), and introduce a certain amount of carbon dioxide gas into the carbonization chamber (32) so that the carbon dioxide gas fills the carbonization chamber (32) and then stop introducing carbon dioxide gas into the carbonization chamber (32), and carbonize the recycled red brick aggregate in the carbonization chamber (32) through the carbon dioxide gas. Step 5, airing; After carbonization is complete, open valve III (36) at the lower end of carbonization chamber (32) so that the recycled red brick aggregate carbonized by carbon dioxide in carbonization chamber (32) is poured onto conveying device II (41) of airing device. The recycled red brick aggregate is then conveyed to airing chamber (42) by conveying device II (41) for airing. Step 6, collection; open valve IV (44) at the discharge port at the lower end of the drying chamber (42) to discharge the dried recycled red brick aggregate, and collect the recycled red brick aggregate for subsequent use.
7. The carbon fixation and strengthening method for recycled red brick aggregate according to claim 6, characterized in that: In step two, the recycled red brick aggregate is poured into the middle chamber (23) from the feed port at the top of the middle chamber (23) until the height of the recycled red brick aggregate is 2 / 3 of the height of the middle chamber (23) and the right chamber (25); lime water is introduced into the left chamber (24) until the lime water submerges the recycled red brick aggregate; the shaking device (22) drives the reaction chamber to shake for 20 minutes.
8. The carbon fixation and strengthening method for recycled red brick aggregate according to claim 6, characterized in that: In step four, the recycled red brick aggregate is conveyed to the carbonization bin (32) by the conveying device I (31) until the height of the recycled red brick aggregate is 2 / 3 of the height of the carbonization bin (32) and then the conveying stops; the carbonization time of the recycled red brick aggregate in the carbonization bin (32) is 24 hours.
9. A method for carbon fixation and strengthening of recycled red brick aggregate according to claim 6, characterized in that: In step five, the recycled red brick aggregate is conveyed to the drying bin (42) by the conveying device II (41) until the height of the recycled red brick aggregate is 2 / 3 of the height of the drying bin (42) and then the conveying stops; the recycled red brick aggregate is dried in the drying bin (42) for 24 hours.