Over-carbonization prevention assembly for calcium carbonate preparation

Abstract

The utility model relates to the technical field of calcium carbonate preparation, and discloses an over-carbonization prevention assembly for calcium carbonate preparation, which comprises a reaction tank, an aging cavity and a carbonization cavity are arranged in the reaction tank, a heating ring pipe is fixedly arranged in the aging cavity, a cooling water circulating pipe and an airflow dispersion disc are fixedly arranged in the carbonization cavity, and a stirring structure is rotatably arranged in the reaction tank. The stirring structure comprises a shaft rod, a stirring rod, a sleeve, a scraping rod, turning and stirring blades and a rotating impeller, the shaft rod is rotationally arranged in the reaction tank, the stirring rod, the sleeve and the rotating impeller are fixedly arranged on the shaft rod, the turning and stirring blades are rotationally arranged on the shaft rod, the scraping rod is movably arranged on the sleeve, and liquid in the reaction tank is stirred by utilizing a spring to be matched with a pull rod and the scraping rod; and meanwhile, hard scales on the inner wall surface of the reaction tank are scraped in a flexible stirring manner, so that an over-carbonization reaction caused by impurities is prevented to a certain extent while a cleaning effect is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of calcium carbonate preparation technology, specifically, it relates to an anti-overcarbonation component for calcium carbonate preparation. Background Technology

[0002] In the calcium carbonate preparation process, the "excessive carbonation of components" mainly refers to systematic measures taken through process parameter control, equipment design, and additives to prevent calcium hydroxide from reacting excessively with carbon dioxide to form calcium bicarbonate, which would lead to excessively large product particle size or structural defects.

[0003] The prior art discloses a carbonation device for calcium carbonate processing (CN221156578U). By setting up a waste heat recovery component and opening the recovery valve and the air inlet valve, the waste heat inside the carbonation chamber can be reintroduced into the interior of the carbonation chamber through the air inlet pipe, realizing the recovery of waste heat from the carbonation chamber. The waste heat is then used to continue heating and carbonizing the calcium carbonate inside the carbonation chamber, preventing the waste of heat energy. This addresses the problem in the prior art's carbonation tower that generates a large amount of heat energy during the carbonation of calcium carbonate, which is directly discharged by the operator during carbonation and is difficult to recover and utilize, thus potentially causing heat energy waste. By setting up a staged carbonation component, calcium carbonate can be carbonized in both primary and secondary stages, solving the problem that the carbonation tower in the prior art can only perform primary carbonation of calcium carbonate and is unable to perform staged carbonation.

[0004] The search revealed that the existing technology does not include control measures for the uniformity of carbon dioxide gas distribution. Impurities in phosphogypsum slurry, such as sulfates and phosphates, can easily lead to excessively high local carbon dioxide concentrations, triggering overcarbonation side reactions that generate calcium bicarbonate. Furthermore, calcium sulfate in phosphogypsum slurry is prone to crystallization and precipitation at high temperatures, adhering to the reactor wall to form hard scale. The existing technology lacks measures to clean this hard scale, causing the local reaction to continue and ultimately leading to overcarbonation.

[0005] In view of this, this utility model is proposed. Utility Model Content

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] An anti-overcarbonation component for calcium carbonate preparation, comprising:

[0008] The reaction vessel is equipped with an aging chamber and a carbonization chamber. A heating ring pipe is fixedly installed in the aging chamber, and a cooling water circulation pipe and an airflow dispersion plate are fixedly installed in the carbonization chamber.

[0009] A stirring structure is rotatably mounted inside a reaction vessel. The stirring structure includes a shaft, a stirring rod, a sleeve, a scraper, a stirring blade, and a rotating impeller. The shaft is rotatably mounted inside the reaction vessel. The stirring rod, sleeve, and rotating impeller are all fixedly mounted on the shaft. The stirring blade is rotatably mounted on the shaft. The scraper is movably mounted on the sleeve.

[0010] In a preferred embodiment of this utility model, a feed pipe and an exhaust pipe are fixedly provided at the top of the reaction tank, a discharge pipe is fixedly provided at the bottom of the reaction tank, a discharge pipe and a solenoid valve are symmetrically arranged inside the reaction tank, and the aging chamber is connected to the carbonization chamber through the discharge pipe and the solenoid valve.

[0011] In a preferred embodiment of this utility model, the airflow dispersion plate is composed of three nested annular cylinders of different specifications. Each of the three annular cylinders has multiple air vents arranged in a circular array. The air vents of the three annular cylinders have different diameters. An air inlet pipe is fixedly installed on the airflow dispersion plate. The air inlet pipe passes through the reaction tank. Valves are fixedly installed on both the discharge pipe and the air inlet pipe.

[0012] In a preferred embodiment of this utility model, a motor is fixedly installed on the top of the reaction vessel, the output end of the motor is connected to the top of the shaft, four stirring rods are symmetrically arranged, and two sleeves and scrapers are symmetrically arranged. The four stirring rods and the two sleeves are all symmetrically arranged with the shaft as the center.

[0013] In a preferred embodiment of this utility model, the rotating impeller is fixedly mounted on the bottom surface of the shaft, the rotating impeller is rotatably mounted in the inner ring of the airflow dispersion disk, the cross-sectional shape of the stirring blade is similar to an I-shaped structure, and the stirring blade is rotatably mounted above the top surface of the airflow dispersion disk.

[0014] In a preferred embodiment of this utility model, the scraper is a triangular strip structure, and a nail-shaped pull rod is fixedly provided on the side of the scraper near the sleeve. The pull rod slides through the sleeve, and a spring is fixedly provided between the pull rod and the sleeve. The pull rod is elastically connected to the sleeve through the spring.

[0015] In a preferred embodiment of this utility model, temperature sensors are installed on the top surfaces of both the aging chamber and the carbonization chamber, and a pH meter is installed on the inner wall of the carbonization chamber. Both the temperature sensors and the pH meter are externally connected to a PLC control terminal, and the PLC control terminal is electrically connected to a motor, a solenoid valve, a heating ring tube, a pH meter, and the two temperature sensors.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. By setting up a rotating impeller and an airflow dispersion plate, the rotating impeller guides the flow of carbon dioxide. The nested structure of vents of different diameters and airflow dispersion plates can achieve dynamic gas distribution. Combined with the rotatable stirring blades, it avoids local overheating in the local stirring part. By addressing both the slurry temperature and the uniform distribution of gas and liquid, it avoids excessive carbon dioxide concentration and excessive temperature in some areas, thus preventing over-carbonization.

[0018] 2. By setting up a stirring structure, the liquid in the reaction vessel is stirred by springs, pull rods and scrapers, which promotes uniform circulation of the liquid temperature. At the same time, the gentle stirring method scrapes away the hard scale on the inner wall of the reaction vessel, which not only cleans the vessel but also prevents impurities from causing over-carbonization reaction to a certain extent.

[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0020] In the attached diagram:

[0021] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the airflow dispersion disc of this utility model;

[0023] Figure 3 This is a schematic diagram of the stirring structure of this utility model;

[0024] Figure 4 This utility model is for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 5 This utility model is for Figure 1 Enlarged diagram of point B in the middle.

[0026] In the diagram: 10. Reaction vessel; 11. Motor; 12. Feed pipe; 13. Exhaust pipe; 14. Heating ring pipe; 15. Cooling water circulation pipe; 16. Discharge pipe; 17. Air inlet pipe; 18. Airflow dispersion disc; 19. Vent hole; 20. Shaft; 21. Stirring rod; 22. Sleeve; 23. Scraper; 24. Tumbling blade; 25. Rotary impeller; 26. Temperature sensor; 27. Spring; 28. Pull rod; 29. ​​pH meter. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0028] An anti-overcarbonation component for calcium carbonate preparation, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, including

[0029] The reaction vessel 10 is provided with an aging chamber and a carbonization chamber. A heating ring pipe 14 is fixedly installed in the aging chamber, and a cooling water circulation pipe 15 and an airflow dispersion plate 18 are fixedly installed in the carbonization chamber.

[0030] The stirring structure is rotatably installed inside the reaction tank 10. The stirring structure includes a shaft 20, a stirring rod 21, a sleeve 22, a scraper 23, a stirring blade 24, and a rotating impeller 25. The shaft 20 is rotatably installed inside the reaction tank 10. The stirring rod 21, the sleeve 22, and the rotating impeller 25 are all fixedly installed on the shaft 20. The stirring blade 24 is rotatably installed on the shaft 20. The scraper 23 is movably installed on the sleeve 22.

[0031] like Figure 1 As shown, the top of the reaction tank 10 is fixedly equipped with a feed pipe 12 and an exhaust pipe 13, the bottom of the reaction tank 10 is fixedly equipped with a discharge pipe 16, and the inside of the reaction tank 10 is symmetrically equipped with a discharge pipe and a solenoid valve. The aging chamber is connected to the carbonization chamber through the discharge pipe and the solenoid valve.

[0032] Specifically, the solenoid valve is connected to an external PLC control terminal. The PLC control terminal controls the start and stop of the heating ring pipe 14 in this device and the heating temperature. The aging chamber and the carbonization chamber are arranged vertically. When using this device, quicklime and water are added through the feed pipe 12. The quicklime and water react in the aging chamber by stirring the stirring rod 21 to generate a slurry. The heating ring pipe 14 controls the digestion water temperature to be between 50 and 80°C to accelerate the reaction. The aging time is ≥16 hours. During this period, the stirring structure is used to stir to prevent particle sedimentation and ensure complete dissolution. Then, the solenoid valve is opened by the PLC controller to discharge the completely dissolved slurry into the carbonization chamber.

[0033] like Figure 1 and Figure 2 As shown, the airflow dispersion plate 18 is composed of three nested annular cylinders of different specifications. Each of the three annular cylinders has multiple air vents 19 arranged in an annular array. The air vents 19 of the three annular cylinders have different diameters. An air inlet pipe 17 is fixedly installed on the airflow dispersion plate 18. The air inlet pipe 17 passes through the reaction tank 10. Valves are fixedly installed on both the discharge pipe 16 and the air inlet pipe 17.

[0034] like Figure 4 and Figure 5As shown, temperature sensors 26 are installed on the top surfaces of both the aging chamber and the carbonization chamber, and pH meters 29 are installed on the inner wall of the carbonization chamber. Both temperature sensors 26 and pH meters 29 are externally connected to the PLC control terminal. The PLC control terminal is connected to the motor 11, solenoid valve, heating ring tube 14, pH meter 29 and the two temperature sensors 26 via electrical signals.

[0035] Specifically, the PLC control terminal controls the start / stop and speed of motor 11, the start / stop of solenoid valve, the start / stop of heating ring 14, and the heating temperature. It also receives the solution pH value sensed by pH meter 29 and the temperature signals transmitted by two temperature sensors 26. When quicklime reacts with water to form Ca(OH)2 slurry, and the digestion water temperature needs to be controlled between 50 and 80°C to accelerate the reaction, temperature sensor 26 in the aging chamber senses the temperature inside the aging chamber and transmits the temperature signal to the PLC control terminal. The PLC control terminal then controls heating ring 14 to heat to the appropriate temperature. During aging, the PLC control terminal controls motor 11 to drive the stirring structure to prevent particle sedimentation and ensure the Ca(OH)2 slurry is properly heated. )2. After complete dissolution, CO2 gas is introduced into the airflow dispersion disk 18 through the air inlet pipe 17. The three-layer nested structure of the air inlet 19 with different apertures and the airflow dispersion disk 18 can realize dynamic gas distribution. The PLC controls the air intake and receives the real-time temperature of the temperature sensor 26 in the carbonization chamber. The temperature inside the carbonization chamber is regulated by the cooling water transported through the cooling water circulation pipe 15. At the same time, the pH meter 29 in the carbonization chamber monitors the pH value of the slurry in real time. When the pH drops to 9.0, the gas supply is stopped and the carbonization is paused to avoid over-reaction. A second carbonization is carried out after 3 to 5 days. The pH value of the slurry is monitored in real time by the endpoint pH meter 29 to be ≤7.0, and the crystal structure is further regulated.

[0036] like Figure 3 As shown, a motor 11 is fixedly installed on the top of the reaction vessel 10. The output end of the motor 11 is connected to the top of the shaft 20. Four stirring rods 21 are symmetrically arranged, and two sleeves 22 and two scraper rods 23 are symmetrically arranged. The four stirring rods 21 and the two sleeves 22 are all symmetrically arranged with the shaft 20 as the center.

[0037] like Figure 1 , Figure 3 and Figure 5 As shown, the rotating impeller 25 is fixedly mounted on the bottom surface of the shaft 20, and the rotating impeller 25 is rotatably mounted on the inner ring of the airflow dispersion disk 18. The cross-sectional shape of the stirring blade 24 is similar to an I-shaped structure, and the stirring blade 24 is rotatably mounted above the top surface of the airflow dispersion disk 18.

[0038] like Figure 3 and Figure 4As shown, the scraper 23 is a triangular strip structure. A nail-shaped pull rod 28 is fixedly installed on the side of the scraper 23 near the sleeve 22. The pull rod 28 slides through the sleeve 22. A spring 27 is fixedly installed between the pull rod 28 and the sleeve 22. The pull rod 28 is elastically connected to the sleeve 22 through the spring 27.

[0039] Specifically, motor 11 drives shaft 20 to rotate, which in turn drives four stirring rods 21, two sleeves 22, and two scrapers 23 to mix and stir the slurry in the aging chamber. Simultaneously, the centrifugal force generated by the rotation of shaft 20, with the cooperation of spring 27, ejects pull rod 28 and scraper 23. The ejected scraper 23 agitates the liquid in reaction tank 10, promoting uniform temperature circulation within the liquid. At the same time, the flexible stirring method scrapes away hard scale on the inner wall of reaction tank 10, achieving a cleaning effect while preventing over-carbonization caused by impurities to a certain extent. Simultaneously, shaft 20 drives rotating impeller 25 to rotate, which guides the flow of carbon dioxide. The three-layer nested structure of vent holes 19 with different diameters and airflow dispersion disk 18 can achieve dynamic gas distribution. Combined with rotatable stirring blades 24, it avoids local overheating in the stirring area. By addressing both slurry temperature and uniform gas-liquid distribution, it prevents excessively high local carbon dioxide concentrations and temperatures that could lead to over-carbonization.

[0040] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A component for preventing overcarbonation in calcium carbonate preparation, characterized in that, include The reaction vessel (10) is provided with an aging chamber and a carbonization chamber. A heating ring pipe (14) is fixedly installed in the aging chamber, and a cooling water circulation pipe (15) and an airflow dispersion plate (18) are fixedly installed in the carbonization chamber. The stirring structure is rotatably disposed inside the reaction tank (10). The stirring structure includes a shaft (20), a stirring rod (21), a sleeve (22), a scraper (23), a stirring blade (24), and a rotating impeller (25). The shaft (20) is rotatably disposed inside the reaction tank (10). The stirring rod (21), the sleeve (22), and the rotating impeller (25) are all fixedly disposed on the shaft (20). The stirring blade (24) is rotatably disposed on the shaft (20). The scraper (23) is movably disposed on the sleeve (22).

2. The anti-overcarbonation assembly for calcium carbonate production according to claim 1, characterized in that, The top of the reaction tank (10) is fixedly provided with a feed pipe (12) and an exhaust pipe (13), and the bottom of the reaction tank (10) is fixedly provided with a discharge pipe (16). The inside of the reaction tank (10) is symmetrically provided with a discharge pipe and a solenoid valve. The aging chamber is connected to the carbonization chamber through the discharge pipe and the solenoid valve.

3. The anti-overcarbonation assembly for calcium carbonate production according to claim 2, characterized in that, The airflow dispersion plate (18) is composed of three nested annular cylinders of different specifications. Each of the three annular cylinders has multiple ventilation holes (19) arranged in an annular array. The ventilation holes (19) of the three annular cylinders have different diameters. An air inlet pipe (17) is fixedly installed on the airflow dispersion plate (18). The air inlet pipe (17) passes through the reaction tank (10). Valves are fixedly installed on both the discharge pipe (16) and the air inlet pipe (17).

4. The anti-overcarbonation component for calcium carbonate preparation according to claim 3, characterized in that, A motor (11) is fixedly installed on the top of the reaction vessel (10). The output end of the motor (11) is connected to the top of the shaft (20). Four stirring rods (21) are symmetrically arranged. Two sleeves (22) and two scrapers (23) are symmetrically arranged. The four stirring rods (21) and the two sleeves (22) are all symmetrically arranged with the shaft (20) as the center.

5. The anti-overcarbonation assembly for calcium carbonate production according to claim 4, characterized in that, The rotating impeller (25) is fixedly mounted on the bottom surface of the shaft (20). The rotating impeller (25) is rotatably mounted on the inner ring of the airflow dispersion disk (18). The cross-sectional shape of the stirring blade (24) is similar to an I-shaped structure. The stirring blade (24) is rotatably mounted above the top surface of the airflow dispersion disk (18).

6. The anti-overcarbonation assembly for calcium carbonate production according to claim 4, characterized in that, The scraper (23) is a triangular strip structure. A nail-shaped pull rod (28) is fixedly installed on the side of the scraper (23) near the sleeve (22). The pull rod (28) slides through the sleeve (22). A spring (27) is fixedly installed between the pull rod (28) and the sleeve (22). The pull rod (28) is elastically connected to the sleeve (22) through the spring (27).

7. The anti-overcarbonation assembly for calcium carbonate production according to claim 2, characterized in that, Temperature sensors (26) are installed on the top surfaces of the aging chamber and the carbonization chamber. A pH meter (29) is installed on the inner wall of the carbonization chamber. Both the temperature sensor (26) and the pH meter (29) are externally connected to the PLC control terminal. The PLC control terminal is electrically connected to the motor (11), the solenoid valve, the heating ring tube (14), the pH meter (29), and the two temperature sensors (26).

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