Device for preparing aggregate by wet carbonization

Abstract

The utility model belongs to the technical field of aggregate preparation equipment, and particularly relates to a device for preparing aggregate by wet carbonization, which comprises a base, a nanoscale CO2 gas input mechanism and a beaker, the upper side of the base is fixedly connected with a base, and the beaker is fixedly connected to the upper side of the base. The upper side of the base is further fixedly connected with a stirrer capable of stirring the interior of the beaker, the nanoscale CO2 gas input mechanism comprises a gas cylinder, the gas cylinder is communicated with a guide pipe, one end of the guide pipe is communicated with a nanometer gas disperser located in the beaker, and the stirrer comprises a vertical support fixedly connected to the upper side of the base and located on one side of the beaker. The vertical bracket is fixedly connected with a connecting rod, the connecting rod is rotatably connected with a rotating paddle positioned in the beaker, and the connecting rod is also fixedly connected with a transmission motor. According to the utility model, CO2 can be more uniformly dispersed and output into a matrix solution through the nano gas disperser, so that the carbonization reaction is accelerated, and the strength of the artificial aggregate is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of aggregate preparation equipment, specifically relating to an apparatus for preparing aggregates using wet carbonization. Background Technology

[0002] As a major agricultural country, China generates a large amount of silicon- and aluminum-rich corn stalk ash (CSA) annually due to the ban on burning corn stalks. This material is characterized by its pozzolanic activity, large specific surface area, and well-developed pore structure, making it an environmentally friendly material rich in silicon and aluminum with pozzolanic activity. Waste concrete slurry (CSW) generated by the concrete industry causes resource waste and soil pollution due to landfill disposal. This waste contains unhydrated cement particles, possessing a cementitious activity base; adding pozzolanic materials can create a strength-enhancing mechanism. When CSA and CSW are co-prepared to produce recycled aggregates, the pozzolanic active substances in CSA can react with the cement hydration products in CSW to form a dense structure, increasing aggregate strength; the continuous hydration of unhydrated cement in CSW provides basic strength, creating a synergistic strengthening effect with the micro-aggregate effect of CSA. The combination of these two materials can both dispose of solid waste and reduce building material production costs, while also promoting sustainable development by reducing the mining of natural aggregates.

[0003] Chinese patent application publication number CN 117819852 A discloses an apparatus and method for efficiently strengthening recycled concrete aggregates using wet carbonization. The use of ethanol-water solution wet carbonization can greatly improve the carbonization efficiency of CO2 carbonized aggregates.

[0004] However, when CO2 is introduced into the matrix solution, it diffuses outward from the gas disperser in a fixed position, which can easily lead to uneven distribution of CO2 gas in the matrix solution and affect the carbonization reaction. Utility Model Content

[0005] The purpose of this invention is to provide an apparatus for preparing aggregates using wet carbonization, which can more uniformly disperse CO2 into the matrix solution through a nano gas disperser, thereby accelerating the carbonization reaction and improving the strength of the artificial aggregates.

[0006] The specific technical solution adopted by this utility model is as follows:

[0007] An apparatus for preparing aggregates using wet carbonization includes a base, a nanoscale CO2 gas input mechanism, and a beaker;

[0008] A base is fixedly connected to the upper side of the base, the beaker is fixedly connected to the upper side of the base, and a stirrer for stirring the inside of the beaker is also fixedly connected to the upper side of the base.

[0009] The nanoscale CO2 gas input mechanism includes a gas cylinder, a conduit connected to the gas cylinder, and a nanoscale gas disperser located inside a beaker at one end of the conduit.

[0010] The stirrer includes a vertical support fixedly connected to the upper side of the base and located on one side of the beaker. A connecting rod is fixedly connected to the vertical support. A rotating impeller located inside the beaker is rotatably connected to the connecting rod. A drive motor is also fixedly connected to the connecting rod. The output end of the drive motor is connected to a gear transmission assembly.

[0011] The lower end of the rotating impeller is fixedly connected to the nano gas disperser.

[0012] Furthermore, the rotary impeller includes a main shaft rotating on a connecting rod, the output end of the drive motor and the main shaft are connected by a gear transmission group, a stirring blade is fixedly connected to the outside of the main shaft, the main shaft is a hollow pipe, the upper end of the main shaft is connected to one end of a conduit through a connector, the nano gas disperser is connected to the lower end of the main shaft, and the lower end of the main shaft is fixedly connected to the nano gas disperser.

[0013] Furthermore, the vertical support includes a column and an electric push rod fixedly connected to the upper side of the base. A slide is vertically slidably connected to the outer side of the column. The connecting rod is fixedly connected to the slide. The output end of the electric push rod is fixedly connected to the slide.

[0014] Furthermore, a gas flow meter is fixedly connected to the conduit.

[0015] The technical effects achieved by this utility model are as follows:

[0016] This invention relates to an apparatus for preparing aggregates using wet carbonization. The rotation of a rotary paddle drives a nano-gas disperser to rotate inside a beaker, allowing the nano-gas disperser to output CO2 from multiple positions at the bottom of the matrix solution. This enables the CO2 to be more evenly dispersed into the matrix solution through the nano-gas disperser, accelerating the carbonization reaction and improving the strength of the artificial aggregate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] The attached diagram lists the components represented by each number as follows:

[0019] 1. Gas cylinder; 2. Conduit; 3. Gas flow meter; 4. Connecting rope; 5. Connector; 6. Connecting rod; 7. Gear transmission assembly; 8. Drive motor; 9. Column; 10. Beaker; 11. Nanobubble; 12. Rotary paddle; 13. Base; 14. Base; 15. Nano gas disperser; 16. Matrix solution; 17. Artificial aggregate; 18. Metal mesh; 19. Electric actuator; 20. Carriage. Detailed Implementation

[0020] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0021] like Figure 1 As shown, an apparatus for preparing aggregates using wet carbonization includes a base 13, a nanoscale CO2 gas input mechanism, and a beaker 10.

[0022] A base 14 is fixedly connected to the upper side of the base 13, and a beaker 10 is fixedly connected to the upper side of the base 14. The fixing method can be snap-fit, magnetic, screw connection or direct placement. A matrix solution 16 can be added inside the beaker 10, and the matrix solution 16 is preferably water.

[0023] A stirrer for stirring the matrix solution 16 inside the beaker 10 is also fixedly connected to the upper side of the base 13.

[0024] The stirrer includes a vertical support fixedly connected to the upper side of the base 13 and located on one side of the beaker 10. A connecting rod 6 is fixedly connected to the vertical support. A rotating impeller 12 located inside the beaker 10 is rotatably connected to the connecting rod 6. A drive motor 8 is also fixedly connected to the connecting rod 6. The output end of the drive motor 8 is connected to the gear transmission group 7. By starting the drive motor 8, the rotating impeller 12 can be driven to rotate, so that the rotating impeller 12 stirs the matrix solution 16 inside the beaker 10.

[0025] The vertical support includes a column 9 fixedly connected to the upper side of the base 13 and an electric push rod 19. A slide 20 is vertically slidably connected to the outer side of the column 9. A connecting rod 6 is fixedly connected to the slide 20. The output end of the electric push rod 19 is fixedly connected to the slide 20. By starting the electric push rod 19, the rotating paddle 12 on the connecting rod 6 can be raised and lowered, and the rotating paddle 12 can be moved in and out of the beaker 10, making it convenient to take out the beaker 10.

[0026] The nanoscale CO2 gas input mechanism includes a gas cylinder 1, with a conduit 2 connected to the gas cylinder 1. One end of the conduit 2 is connected to a nanoscale gas disperser 15 located inside the beaker 10. When CO2 gas is released through the gas cylinder 1, the CO2 gas can be more evenly dispersed into the matrix solution 16 inside the beaker 10 through the nanoscale gas disperser 15, forming nanobubbles 11 evenly distributed inside the matrix solution 16. When the artificial aggregate 17 is added into the beaker 10, the artificial aggregate 17 can float in the matrix solution 16 by rotating the rotating paddle 12, so that the artificial aggregate 17 can maintain a larger contact area with the matrix solution 16.

[0027] A gas flow meter 3 is fixedly connected to the conduit 2, and the flow rate of CO2 gas can be controlled by the gas flow meter 3.

[0028] Specifically, the rotary impeller 12 includes a main shaft rotating on the connecting rod 6. The output end of the drive motor 8 is connected to the main shaft via a gear transmission group 7. A stirring blade is fixedly connected to the outside of the main shaft. The main shaft is a hollow pipe. The upper end of the main shaft is connected to one end of the conduit 2 via a connector 5. The connector 5 is preferably a rotary joint. The nano gas disperser 15 is connected to the lower end of the main shaft, so that the CO2 gas inside the conduit 2 can enter the nano gas disperser 15 through the rotary impeller 12. Specifically, the lower end of the main shaft is fixedly connected to the nano gas disperser 15. At this time, the main shaft drives the nano gas disperser 15 to rotate, so that the CO2 gas can be released relatively evenly into the matrix solution 16, forming nano bubbles 11 evenly distributed inside the matrix solution 16.

[0029] The lower side of the connecting rod 6 is fixedly connected to the metal mesh 18 located inside the beaker 10 by the connecting rope 4. The connection method is relatively simple. The main shaft and the lower part of the metal mesh 18 are rotatably connected. By placing the artificial aggregate 17 inside the metal mesh 18, the collision between the artificial aggregate 17 and the side wall of the beaker 10 during the stirring process can be reduced.

[0030] Artificial aggregate 17 comprises corn stalk ash, concrete slurry waste, and water, wherein the corn stalk ash is 0%–30 wt%, the concrete slurry waste is 70%–100 wt%, and an appropriate amount of water. The proportions of each component in the preparation of artificial aggregate 17 using corn stalk ash are shown in Table 1.

[0031] Table 1. Proportions of 17 Components in Corn Stalk Ash Artificial Aggregate

[0032]

[0033]

[0034] The preparation of artificial aggregate 17 using corn stalk ash according to the mixing ratios in Examples 1-7 above includes the following steps:

[0035] S1: Place the concrete slurry waste filter cake into a forced mixer and mix at high speed for 2-3 minutes until loose. Then add corn stalk ash and continue mixing at high speed for 2-3 minutes to ensure uniform mixing.

[0036] S2: The mixture is then transferred to a disc granulator and granulated at a speed of 35-45 rpm and a disc angle of 40-50° for 5-7 minutes. During the last 2 minutes of granulation, water is sprayed as needed based on the material's moisture content to ensure the total moisture content of the granules is controlled between 15% and 25%, thus avoiding any impact on granule strength. The entire granulation process should be completed within 15 minutes.

[0037] S3: The fresh aggregate obtained in step S2 is pre-dried at a relative humidity of 50% to 60% for 8 to 12 hours to obtain initial strength, thus obtaining artificial aggregate 17.

[0038] A method for efficiently reinforcing artificial aggregate 17 using wet carbonization includes the following steps:

[0039] S1: Add a certain amount of matrix solution 16 to beaker 10, weigh artificial aggregate 17, and place the weighed artificial aggregate 17 into metal mesh 18. The temperature of matrix solution 16 is 20±5℃, and the mass ratio of matrix solution 16 to artificial aggregate 17 is 10:1.

[0040] S2: Completely immerse the metal mesh 18 and artificial aggregate 17 into the matrix solution 16, start the drive motor 8, rotate the paddle 12 at 100 rpm, and introduce 99.9% industrial-grade CO2 gas into the matrix solution 16. Control the CO2 gas flow rate through the gas flow meter 3 to a CO2 gas flow rate of 0.2 L / min. The CO2 is more evenly dispersed in the matrix solution 16 through the nano gas disperser 15. The wet carbonization time is 10 min.

[0041] S3: Remove the artificial aggregate 17 from the metal mesh 18 and place it in a drying oven at T=25℃ and RH=50% for drying.

[0042] The test results of the reinforced artificial aggregate 17 following the above process are shown in Table 2.

[0043] Table 2 Performance Indicators of Artificial Aggregate After Aqueous Solution Wet Carbonization 17

[0044]

[0045]

[0046] As can be seen from Examples 1-7, the apparent density of artificial aggregate 17 prepared from concrete slurry waste and corn stalk ash is 839-1021 kg / m³. 3 The water absorption rate was 7.88–8.94%, and the compressive strength was 8.46–9.56 MPa. As seen in Example 1, the recovered concrete slurry waste has a certain residual activity and can be used to prepare aggregates. As seen in Examples 2–7, the concrete slurry waste can be used as a cementing material in synergistic action with corn stalk ash to produce artificial aggregate 17. With the increase in corn stalk ash production, the apparent density showed a decreasing trend, possibly because the bulk density of corn stalk ash is less than that of the concrete slurry waste. Secondly, the water absorption rate showed a trend of first decreasing and then increasing, while the strength showed a trend of first increasing and then decreasing. The aggregate performance reached its optimal level when the corn stalk ash content was 20%. Example 5 was selected as the mix design for subsequent experiments.

[0047] To improve the carbonization efficiency of artificial aggregate 17, it is considered to replace the matrix solution 16 in wet carbonization with another matrix solution 16 to improve the efficiency of wet carbonization of aggregate. The matrix solution 16 needs to meet the following conditions: first, it has higher CO2 solubility and does not react with CO2 to generate other substances; second, it does not react with CaCO3 and silica gel precipitation. Considering the above conditions, organic solvents can be introduced into the solution selection. Ethanol solution can be mixed with water in any proportion and has a higher proportion of CO2 solubility than aqueous solution. Therefore, ethanol solution is preferred as the matrix solution 16 for wet carbonization.

[0048] Then, a 30% ethanol solution was used as the matrix solution 16 for wet carbonization to strengthen the artificial aggregate 17. The artificial aggregate 17 was designed with the best performance proportion from Example 5. Simultaneously, uncarbonized and pressurized carbonization were compared and analyzed. The carbonization process parameters are shown in Table 3, and the test results are shown in Table 4.

[0049] Table 3 Carbonization parameter settings

[0050]

[0051] Table 4 Physical properties of artificial aggregate 17 after different carbonization processes

[0052]

[0053] The physical properties of artificial aggregate 17 are shown in Table 3. It can be seen that replacing the matrix solution 16 with an ethanol solution gradually improves the quality and carbonization efficiency of artificial aggregate 17. When the ethanol solution concentration is 30%, artificial aggregate 17 achieves the highest apparent density, cylinder compressive strength, and lowest water absorption rate, which are 938 kg / m³. 3The values ​​were 7.04% and 12.03 MPa, respectively, representing increases of 15.42%, -36.72%, and 53.34% compared to CC.

[0054] In summary, this technical solution uses the rotation of the rotary paddle 12 to drive the nano gas disperser 15 to rotate inside the beaker 10, allowing the nano gas disperser 15 to output CO2 from multiple positions at the bottom of the matrix solution 16. This enables the CO2 to be more evenly dispersed into the matrix solution 16 through the nano gas disperser 15, thereby accelerating the carbonization reaction and improving the strength of the artificial aggregate 17.

[0055] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. An apparatus for preparing aggregates using wet carbonization, characterized in that: Includes a base (13), a nanoscale CO2 gas input mechanism, and a beaker (10); A base (14) is fixedly connected to the upper side of the base (13), and the beaker (10) is fixedly connected to the upper side of the base (14). A stirrer that can stir the inside of the beaker (10) is also fixedly connected to the upper side of the base (13). The nanoscale CO2 gas input mechanism includes a gas cylinder (1), a conduit (2) connected to the gas cylinder (1), and a nano gas disperser (15) located inside a beaker (10) at one end of the conduit (2). The stirrer includes a vertical support fixedly connected to the upper side of the base (13) and located on one side of the beaker (10). A connecting rod (6) is fixedly connected to the vertical support. A rotating paddle (12) located inside the beaker (10) is rotatably connected to the connecting rod (6). A drive motor (8) is also fixedly connected to the connecting rod (6). The output end of the drive motor (8) is connected to the gear transmission group (7). The lower end of the rotary propeller (12) is fixedly connected to the nano gas disperser (15).

2. The apparatus for preparing aggregates using wet carbonization according to claim 1, characterized in that: The rotary impeller (12) includes a main shaft that rotates on a connecting rod (6). The output end of the drive motor (8) and the main shaft are connected by a gear transmission group (7). A stirring blade is fixedly connected to the outside of the main shaft. The main shaft is a hollow pipe. The upper end of the main shaft is connected to one end of the conduit (2) through a connector (5). The nano gas disperser (15) is connected to the lower end of the main shaft. The lower end of the main shaft is fixedly connected to the nano gas disperser (15).

3. The apparatus for preparing aggregates using wet carbonization according to claim 1, characterized in that: The vertical support includes a column (9) and an electric push rod (19) fixedly connected to the upper side of the base (13). A slide (20) is vertically slidably connected to the outer side of the column (9). The connecting rod (6) is fixedly connected to the slide (20). The output end of the electric push rod (19) is fixedly connected to the slide (20).

4. The apparatus for preparing aggregates using wet carbonization according to claim 1, characterized in that: A gas flow meter (3) is fixedly connected to the conduit (2).

5. The apparatus for preparing aggregates using wet carbonization according to claim 2, characterized in that: The lower side of the connecting rod (6) is fixedly connected to a metal mesh (18) located inside the beaker (10), and the main shaft and the lower part of the metal mesh (18) are rotatably connected.

6. The apparatus for preparing aggregates using wet carbonization according to claim 5, characterized in that: The metal mesh (18) is fixedly connected to the lower side of the connecting rod (6) by the connecting rope (4).

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