Carbonization reactor for preparing nano calcium carbonate

Abstract

The application discloses a carbonization reaction kettle for preparing nano calcium carbonate and belongs to the technical field of chemical equipment. The carbonization reaction kettle comprises a reaction kettle body, a stirring assembly, a uniform material injection assembly, an anti-backflow assembly and a switching assembly. The uniform material injection assembly is arranged on the side wall of the kettle body, the feeding unit of the uniform material injection assembly is driven by a power unit, the end valve port is controlled to open and close, and the uniform material injection assembly extends into the kettle to inject material in a direction. The plugging unit of the anti-backflow assembly is connected with an air source and is sleeved on the aeration unit to rotate to switch the gas flow. The transmission unit of the switching assembly is limited to horizontally stretch and retract, the plugging unit is rotated around the shaft to switch the aeration state. The feeding unit directly reaches the deep layer to inject material in a direction, the deep layer reaction lag phenomenon caused by traditional surface feeding is changed, and the activation efficiency is improved. Meanwhile, the aeration state is switched in linkage, the high-low pressure air seal is formed when material is injected and returned, the slurry backflow is effectively prevented, and the stable operation of the mechanism is ensured.

Description

Technical Field

[0001] This invention relates to the field of chemical equipment technology, and in particular to a carbonation reactor for the preparation of nano-calcium carbonate. Background Technology

[0002] Nano-calcium carbonate, as an important ultrafine inorganic powder material, is widely used in high-end industrial fields such as plastics, rubber, and coatings due to its excellent reinforcing, toughening, and filling properties. To improve the dispersibility and compatibility of nano-calcium carbonate in organic polymer matrices, surface activation treatment is usually required in the later stages of its preparation process. Existing activation processes are typically carried out in a carbonization reactor, mainly by adding liquid or atomized surface activators to a slurry containing nano-calcium carbonate, and using a mechanical stirring device inside the reactor to ensure that the activator is uniformly coated on the surface of the calcium carbonate particles.

[0003] Traditional carbonation reactors mostly use methods such as top dripping, straight pipe injection, or surface spraying to introduce activators into the reactor, which are then mixed by the main shaft agitator inside the reactor. When activators are added to the reactor, since the addition point is usually located at the liquid surface or shallow layer, the activator often only comes into contact with the upper layer of calcium carbonate slurry and undergoes a rapid coating reaction. The calcium carbonate slurry in the deeper layers of the reactor requires long-term, high-intensity stirring by the agitator to achieve overall tumbling and mixing of the upper and lower layers of material, and then to contact and react with the activator. This feeding and mixing method results in a delayed deep reaction, low activation efficiency, and a long overall reaction time. Summary of the Invention

[0004] This invention provides a carbonization reactor for the preparation of nano-calcium carbonate, which solves the technical problems of existing carbonization reactors, such as delayed activation of deep slurry due to shallow surface feeding, low overall reaction efficiency, and long reaction time.

[0005] The present invention employs the following technical solution: a carbonation reactor for the preparation of nano-calcium carbonate. It includes a reactor body; A stirring assembly is mounted on the reactor body; A uniform feeding assembly is provided on the side wall of the reactor body, including a pipe unit fixed on the side wall, a feeding unit slidably nested in the pipe unit, and a power unit that drives the feeding unit to move relative to the pipe unit. The feeding unit has a valve port at its end that is controlled to open and close, for being driven to extend into the reactor body for directional feeding. The anti-backflow component is located at one end of the uniform injection component. It includes a ventilation unit fixed to the end of the pipeline unit and a sealing unit rotatably sleeved on the ventilation unit. The ventilation unit and the sealing unit have ventilation channels with different apertures distributed on their contact surfaces. The sealing unit is connected to an external air source and is used to rotate and switch the gas flow rate input into the pipeline unit so as to form a high and low pressure air seal during injection and retraction to prevent slurry backflow. The switching component, located on one side of the anti-backflow component, includes a linear power unit and a transmission unit driven by it. The transmission unit is limited by the blocking unit to extend and retract horizontally, thereby forcing the blocking unit to rotate on a fixed axis to achieve the switching of the ventilation state.

[0006] Furthermore, the piping unit includes an outer pipe and a mounting plate. The outer pipe horizontally penetrates the side wall of the reactor body and is fixed, with both ends connected. Two outer pipes are evenly spaced and arranged vertically on the side wall of the reactor body. The mounting plate is fixed to the inner wall of the outer pipe. The feeding unit includes a feeding guide post, which is nested inside the outer pipe. An installation chamber is provided between the feeding guide post and one end of the outer pipe. The mounting plate is located within the installation chamber. The power unit includes a valve drive and a pushing cylinder. The valve drive is horizontally fixed to the side of the mounting plate. The pushing cylinder is located on one side of one end of the outer pipe, and its telescopic end is connected to one end of the valve drive, used to push the feeding guide post to move relative to the outer pipe.

[0007] Furthermore, the end of the feed guide column extending into the reactor body has a concave valve port, and a feed groove is formed inside the feed guide column. A valve stem is fixed to the telescopic end of the valve drive component. The valve stem initially passes through the feed groove and blocks the concave valve port. The feed unit also includes a bellows and a liquid supply connector. The bellows is fixed to one end of the feed guide column located in the installation chamber and is correspondingly connected to the feed groove. One end of the bellows is connected to the liquid supply connector, which extends vertically upward through the external pipe for connection to an external activator liquid supply device.

[0008] Furthermore, the anti-backflow assembly also includes a mounting frame and a bearing seat. The mounting frame is fixed to the side of the reactor body. The venting unit includes a venting ring, which is fixed to one end of the external pipe. The sealing unit includes a sealing seat, which is annular. An annular sleeve is provided on the side of the sealing seat near the venting ring. The annular sleeve is movably fitted on the venting ring and is used to rotate along the axis of the venting ring. The sealing seat is supported and connected to the mounting frame through the bearing seat. The pushing cylinder is fixed to the mounting frame by a bracket, and the telescopic end of the pushing cylinder passes through the sealing seat, the venting ring, and is connected to the valve drive in sequence. This ensures that the linear thrust transmission and the circumferential rotation air path control do not interfere with each other in space, ensuring that the anti-backflow air path switching action does not affect the linear movement trajectory of the feed guide column.

[0009] Furthermore, waist-shaped holes are evenly opened along the side of the venting ring, and vent holes are evenly opened through the side of the venting ring. The vent holes and waist-shaped holes are arranged adjacent to each other at intervals, and the diameter of the vent holes is larger than the diameter of the waist-shaped holes. The sealing unit also includes sealing plugs. Several vent nozzles and several sealing plugs are evenly arranged circumferentially on the side of the sealing seat near the venting ring. The sealing plugs and vent nozzles are arranged adjacent to each other at intervals. In the initial state, the vent nozzles are connected to the waist-shaped holes, and the vent holes are sealed and closed by the sealing plugs. An air supply connector is fixedly connected to the side of the sealing seat, which can realize the formation of a low-pressure micro-air seal in the initial state to prevent slurry seepage. During the injection, a high-pressure airflow is released instantaneously to form a dynamic pressure air film to protect the feeding component, realizing the isolation and distribution of micro-pressure anti-blocking and high-pressure sweeping air volume.

[0010] Furthermore, a spiral groove is formed along the circumference of the annular sleeve. The linear power unit includes a linear cylinder, and the transmission unit includes a lifting transmission plate, a right-angle connecting rod, and a guide sleeve. The linear cylinder is vertically fixed on the mounting frame, the lifting transmission plate is vertically fixed on the telescopic end of the linear cylinder, and the guide sleeve is fixed on the mounting frame. The horizontal end of the right-angle connecting rod is movably inserted through the guide sleeve to limit the right-angle connecting rod to only horizontal movement. The right-angle connecting rod connects the lifting transmission plate and the spiral groove, effectively filtering out vertical interference and ensuring that the right-angle connecting rod only outputs a stable horizontal thrust, thus improving the accuracy and stability of the reversing transmission.

[0011] Furthermore, the lifting transmission plate has two upper and lower driving grooves. A sliding pin is vertically fixed to the side of the vertical end of the right-angle connecting rod. The sliding pin extends into the driving groove and is used to convert the vertical movement of the linear cylinder into the horizontal extension and retraction of the right-angle connecting rod. A trigger pin is fixed to one end of the horizontal end of the right-angle connecting rod, which extends into the spiral groove and is used to drive the sealing seat, which is supported and restricted by the bearing seat, to rotate on a fixed axis. Through the interlocking method, the timing coordination between the high and low pressure switching action of the air circuit and the material injection action of the feeding unit is ensured.

[0012] Furthermore, the stirring assembly includes a support frame, a drive motor, a stirring shaft, a stirrer, and a bottom support. The support frame is fixed to the reactor body, the drive motor is horizontally fixed to the support frame, the stirring shaft extends vertically into the reactor body, a plurality of stirrers are spaced apart along the vertical direction of the stirring shaft, the bottom support is fixed to the bottom of the inner wall of the reactor body, and the bottom end of the stirring shaft has a spherical positioning point, which cooperates with the bottom support to straighten the stirring shaft.

[0013] Furthermore, the stirring assembly also includes an upper coupling, a reducer, a lower coupling, and a drive shaft. The upper coupling is connected to the output end of the drive motor, the reducer is connected to the end of the upper coupling away from the drive motor, the lower coupling is connected to the output end of the reducer, and the drive shaft is connected to the end of the lower coupling away from the reducer. The end of the drive shaft away from the lower coupling is connected to the stirring shaft.

[0014] Furthermore, the stirring assembly also includes a mechanical seal, which is disposed at the top of the reactor body, and the drive shaft passes downward through the mechanical seal and extends into the reactor body.

[0015] The technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects: A carbonation reactor for the preparation of nano-calcium carbonate is disclosed. This invention utilizes a uniform injection assembly on the side wall of the reactor body. A power unit drives a feeding unit with a controlled valve at its end to directly inject material into the deep interior of the reactor for directional injection. This overcomes the limitations of traditional top-drop or surface spraying methods, which result in the activator remaining only on the shallow surface. The activator can directly contact and react with the medium-deep calcium carbonate slurry without relying on prolonged high-intensity tumbling by a stirring assembly, effectively overcoming the problems of delayed deep-layer reaction and low activation efficiency, and shortening the overall reaction time. Simultaneously, this invention incorporates an anti-backflow assembly and a switching assembly. A linear power unit and a transmission unit mechanically rotate a sealing unit to switch between ventilation channels of varying orifice diameters. During the deep-layer injection and retraction cycles of the feeding unit, the input gas flow rate is dynamically switched, forming a high- and low-pressure gas seal. This effectively prevents backflow and blockage of high-viscosity slurry, ensuring smooth operation and long-term reliability of the deep-layer directional injection process in the complex fluid environment inside the reactor. Attached Figure Description

[0016] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0017] In the attached diagram: Figure 1 This is an explosion diagram of a carbonization reactor used for the preparation of nano-calcium carbonate in this application; Figure 2 This is a schematic cross-sectional view of the carbonization reactor of the present invention; Figure 3 For the present invention Figure 2 A partial structural diagram; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 For the present invention Figure 3 A schematic diagram of the planar structure; Figure 6 for Figure 5 Enlarged structural diagram at point B; Figure 7 For the present invention Figure 3 A partial structural diagram; Figure 8 For the present invention Figure 7 A partial structural diagram; Figure label: 1. Reactor body; 2. Stirring assembly; 21. Support frame; 22. Drive motor; 23. Upper coupling; 24. Reducer; 25. Lower coupling; 26. Drive shaft; 27. Mechanical seal; 28. Stirring shaft; 29. ​​Stirrer; 210. Bottom support; 3. Uniform feeding assembly; 31. External pipe; 32. Feed guide column; 321. Concave valve port; 322. Feed chute; 33. Mounting plate; 34. Valve actuator; 341. Valve stem; 35. Corrugated... 36. Liquid supply connector; 37. Push cylinder; 4. Anti-backflow assembly; 41. Mounting frame; 42. Vent ring; 421. Waist-shaped hole; 422. Vent hole; 43. Sealing seat; 431. Air supply connector; 432. Vent nozzle; 433. Spiral groove; 44. Sealing plug; 45. Bearing seat; 5. Switching assembly; 51. Linear cylinder; 52. Lifting transmission plate; 521. Drive inclined groove; 53. Right-angle connecting rod; 531. Trigger pin; 54. Guide sleeve. Detailed Implementation

[0018] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0019] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Reference Figures 1-8 As shown, this embodiment provides a carbonization reactor for the preparation of nano-calcium carbonate, including a reactor body 1; a stirring assembly 2 disposed on the reactor body 1; a uniform feeding assembly 3 disposed on the side wall of the reactor body 1, including a pipe unit fixed to the side wall, a feeding unit slidably nested within the pipe unit, and a power unit for driving the feeding unit to move relative to the pipe unit, the feeding unit having a controlled opening and closing valve port at its end for being driven to extend into the reactor body 1 for directional feeding; and an anti-backflow assembly 4 disposed at one end of the uniform feeding assembly 3, including a fixed... The pipeline unit has a ventilation unit at its end and a sealing unit rotatably fitted on the ventilation unit. The ventilation unit and the sealing unit have ventilation channels with different apertures corresponding to each other on their contact surfaces. The sealing unit is connected to an external air source and is used to rotate and switch the gas flow rate inside the pipeline unit to form a high-low pressure air seal to prevent slurry backflow during injection and retraction. The switching component 5 is located on one side of the anti-backflow component 4 and includes a linear power unit and a transmission unit driven by it. The transmission unit is limited by the sealing unit to extend and retract horizontally, so as to force the sealing unit to rotate on a fixed axis to achieve the switching of ventilation state.

[0021] The working principle of this device is as follows: During the normal carbonization and stirring stage without activation injection, the uniform injection component 3 is hidden inside the side wall pipe, and the anti-backflow component 4 is kept in a low-flow ventilation state, forming a micro-air seal to prevent calcium carbonate slurry from entering the mechanical gaps. When it is necessary to add activator to the deep slurry, the switching component 5 is activated first, using mechanical transmission to convert linear power into the fixed-axis rotation of the sealing unit, so that the gas passage instantly switches from a small orifice to a large orifice, and a large amount of gas rushes in to form a high-pressure sweeping airflow; then, the power unit drives the feeding unit to extend towards the center of the reactor. During the extension process, the high-pressure gas film continuously wraps and protects the feeding unit from being adhered to by the slurry; after reaching the predetermined deep position, the valve at the end of the feeding unit opens, injecting the activator into the deep slurry for efficient mixing; after the injection is completed, the valve closes, the feeding unit retracts, and during the retraction process, the high-pressure airflow continuously prevents backflow and achieves self-cleaning; finally, the switching component 5 reverses its action, and the ventilation channel switches back to the small orifice micro-pressure standby state.

[0022] Reference Figures 3-4 As shown, in order to realize the extension and linear guidance of the feeding component, the pipeline unit includes an outer pipeline 31 and a mounting plate 33. The outer pipeline 31 is horizontally penetrating through the side wall of the reactor body 1 and is fixed, with both ends connected. There are two outer pipelines 31 arranged vertically and evenly on the side wall of the reactor body 1. The mounting plate 33 is fixed to the inner wall of the outer pipeline 31. The feeding unit includes a feeding guide post 32, which is nested inside the outer pipeline 31. There is an installation chamber (not shown in the figure) between one end of the feeding guide post 32 and one end of the inner wall of the outer pipeline 31. The mounting plate 33 is located in the installation chamber. The power unit includes a valve drive component 34 and a push cylinder 37. The valve drive component 34 is horizontally fixed to the side of the mounting plate 33. The push cylinder 37 is located on one side of one end of the outer pipeline 31, and its extension end is connected to one end of the valve drive component 34 to push the feeding guide post 32 to move relative to the outer pipeline 31.

[0023] By nesting the feed guide column 32 inside the outer pipe 31, a piston-type telescopic structure is formed. The cylinder 37 serves as the main driving source, and the horizontal thrust is transmitted to the feed guide column 32 through the valve drive component 34. The inner wall of the outer pipe 31 is used as a guide surface to restrict the feed guide column 32 from overcoming the pressure of the slurry in the reactor to make linear reciprocating motion, ensuring that the injection point can extend into the reactor body 1 according to process requirements.

[0024] Continue to refer to Figures 3-4As shown, in order to achieve controlled opening and closing of the injection port following the telescopic movement and to introduce external activator, the end of the feed guide column 32 extending into the reactor body 1 has a concave valve port 321. The feed guide column 32 has a feed groove 322 inside. The telescopic end of the valve drive component 34 is fixed with a valve stem 341. The valve stem 341 initially passes through the feed groove 322 and blocks the concave valve port 321. The feeding unit also includes a bellows 35 and a liquid supply connector 36. The bellows 35 is fixed at one end of the feed guide column 32 located in the installation chamber and is correspondingly connected to the feed groove 322. One end of the bellows 35 is connected to the liquid supply connector 36. The liquid supply connector 36 is vertically upward and passes through the external pipe 31 for connection with the external activator liquid supply equipment.

[0025] The flexible structure of the bellows 35 can effectively compensate for the axial displacement generated when the feed guide post 32 is horizontally extended and retracted, ensuring the absolute sealing of the fluid pipeline. When the injection head reaches the predetermined position, the valve drive 34 is activated, driving the valve stem 341 to retract backward in the feed groove 322. At this time, the concave valve port 321 opens, and the activator stock solution is pressed in through the liquid supply connector 36 and the bellows 35 and discharged from the center of the concave position.

[0026] Reference Figures 5-8 As shown, in order to securely install the anti-backflow assembly 4 and achieve its coaxial through-type arrangement with the power unit without interference, the anti-backflow assembly 4 also includes a mounting frame 41 and a bearing seat 45. The mounting frame 41 is fixed to the side of the reactor body 1. The ventilation unit includes a ventilation ring 42, which is fixed to one end of the external pipe 31. The sealing unit includes a sealing seat 43, which is annular. The side of the sealing seat 43 near the ventilation ring 42 is provided with an annular sleeve, which is movably fitted on the ventilation ring 42 and used to rotate along the axis of the ventilation ring 42. The sealing seat 43 is supported and connected to the mounting frame 41 through the bearing seat 45. The push cylinder 37 is fixed to the mounting frame 41 by a bracket, and the extension end of the push cylinder 37 passes through the sealing seat 43, the ventilation ring 42 and is connected to the valve drive component 34 in sequence.

[0027] The power shaft of the cylinder 37 adopts a coaxial through-type layout. While driving the feed guide column 32 to extend and retract, the sealing seat 43 on its periphery can rotate independently in the circumferential direction under the restriction of the bearing seat 45. This achieves non-interference between linear thrust transmission and rotary air path control, ensuring that the linear trajectory of the feed guide column 32 is not disturbed.

[0028] Continue to refer to Figures 5-8As shown, in order to achieve the isolation and distribution of low-pressure gas seal and high-pressure purging gas volume, waist-shaped holes 421 are evenly opened along the side of the vent ring 42, and vent holes 422 are evenly opened through the side of the vent ring 42. The vent holes 422 and waist-shaped holes 421 are arranged adjacent to each other at intervals, and the diameter of the vent holes 422 is larger than the diameter of the waist-shaped holes 421. The sealing unit also includes sealing plugs 44. Several vent nozzles 432 and several sealing plugs 44 are evenly arranged circumferentially on the side of the sealing seat 43 near the vent ring 42. The sealing plugs 44 and vent nozzles 432 are arranged adjacent to each other at intervals. In the initial state, the vent nozzles 432 are connected to the waist-shaped holes 421, and the vent holes 422 are blocked and closed by the sealing plugs 44. The side of the sealing seat 43 is connected and fixed with an air supply connector 431.

[0029] The end face of the sealing seat 43 fits tightly against the end face of the venting ring 42, forming an end face distribution mechanism similar to a rotary slide valve. Under normal conditions, the sealing seat 43 uses orifice alignment to guide the air supply path to the small-diameter oblong hole 421, maintaining a slight positive pressure inside the vessel to prevent slurry penetration. When the injection action is performed, the sealing seat 43 rotates, aligning the vent nozzle 432 with the large-diameter venting hole 422. At this time, the original oblong hole 421 is cut off by the end face sealing plug 44 due to the misalignment. The pipeline is switched and a high-pressure airflow is released to fill the pipeline installation chamber, forming a dynamic pressure air film covering the surface of the feed guide column 32. The sweeping action of the high-speed airflow isolates the external slurry.

[0030] Reference Figures 6-8 As shown, in order to provide stable vertical power and guide and restrict it to purely horizontal movement, a spiral groove 433 is provided along the circumference of the annular sleeve. The linear power unit includes a linear cylinder 51, and the transmission unit includes a lifting transmission plate 52, a right-angle connecting rod 53, and a guide sleeve 54. The linear cylinder 51 is vertically fixed on the mounting frame 41, the lifting transmission plate 52 is vertically fixed on the telescopic end of the linear cylinder 51, and the guide sleeve 54 is fixed on the mounting frame 41. The horizontal end of the right-angle connecting rod 53 is movably inserted through the guide sleeve 54 to restrict the right-angle connecting rod 53 to only achieve horizontal movement. The right-angle connecting rod 53 is used to connect the lifting transmission plate 52 and the spiral groove 433.

[0031] The vertical lifting force provided by the linear cylinder 51 is transmitted downward through the lifting transmission plate 52. The right-angle connecting rod 53 is used as a transfer component, and the linear guidance is achieved by stacking the guide sleeve 54. Only the horizontal thrust is retained for subsequent rotation of the sealing seat 43.

[0032] Reference Figures 7-8As shown, in order to convert the horizontal displacement of the right-angle connecting rod 53 into the fixed-axis rotational motion of the sealing seat 43 to switch the air path, the lifting transmission plate 52 is provided with two upper and lower drive grooves 521. The vertical end of the right-angle connecting rod 53 is vertically fixed with a sliding pin shaft, which extends into the drive groove 521 to convert the vertical motion of the linear cylinder 51 into the horizontal extension and retraction of the right-angle connecting rod 53. One horizontal end of the right-angle connecting rod 53 is fixed with a trigger shaft pin 531 set on the vertical line, which extends into the spiral groove 433 to drive the sealing seat 43, which is supported and restricted by the bearing seat 45, to rotate on a fixed axis.

[0033] The drive sloping groove 521 and the spiral groove 433 form a two-stage reversing mechanism. When the lifting transmission plate 52 moves down, its sloping groove surface squeezes the sliding pin shaft, causing the right-angle connecting rod 53 to produce a horizontal displacement. This horizontal displacement drives the trigger shaft pin 531 to slide along the trajectory of the spiral groove 433. Since the sealing seat 43 is restricted in the axial direction by the bearing seat 45, the lateral force generated can only be converted into the fixed-axis rotation of the sealing seat 43, so as to realize the timing coordination between the air circuit switching action and the material injection action.

[0034] Reference Figures 1-5 As shown, in order to achieve mechanical tumbling of deep materials and prevent the slender stirring shaft 28 from swaying in the deep vessel, the stirring assembly 2 includes a support frame 21, a drive motor 22, a stirring shaft 28, a stirrer 29, and a bottom support 210. The support frame 21 is fixed on the reactor body 1, the drive motor 22 is horizontally fixed on the support frame 21, the stirring shaft 28 extends vertically into the reactor body 1, several stirrers 29 are spaced apart along the vertical direction of the stirring shaft 28, and the bottom support 210 is fixed to the bottom of the inner wall of the reactor body 1. The bottom end of the stirring shaft 28 has a spherical positioning point, which cooperates with the bottom support 210 to straighten the stirring shaft 28.

[0035] The uprighting design of the bottom support 210 solves the technical problem that the stirring shaft 28 is prone to bending deformation in high viscosity slurry. When the spherical positioning point forms an auxiliary support similar to a ball joint in the bottom support 210, when the stirring shaft 28 rotates at high speed and is subjected to lateral slurry resistance, this fulcrum can effectively limit the radial runout of the bottom end of the shaft, ensuring that the stirrer 29 maintains a stable rotation trajectory in the reactor, so that the activator input at the injection point can be quickly sheared and dispersed.

[0036] Furthermore, to achieve speed reduction and torque transmission of the drive motor 22, the stirring assembly 2 also includes an upper coupling 23, a reducer 24, a lower coupling 25, and a drive shaft 26. The upper coupling 23 is connected to the output end of the drive motor 22, the reducer 24 is connected to the end of the upper coupling 23 away from the drive motor 22, the lower coupling 25 is connected to the output end of the reducer 24, and the drive shaft 26 is connected to the end of the lower coupling 25 away from the reducer 24. The end of the drive shaft 26 away from the lower coupling 25 is connected to the stirring shaft 28. In addition, to ensure airtightness and leak prevention when the drive shaft 26 dynamically penetrates the top of the reactor, the stirring assembly 2 also includes a mechanical seal 27. The mechanical seal 27 is located at the top of the reactor body 1, and the drive shaft 26 penetrates downward through the mechanical seal 27 and extends into the reactor body 1.

[0037] The specific workflow is as follows: During the normal carbonization and stirring stage before activation and injection, the cylinder 37 is in the retracted state, and the feed guide column 32 of the uniform injection component 3 is hidden inside the outer pipe 31. At this time, the switching component 5 is in the initial position, and the sealing seat 43 of the anti-backflow component 4 makes the vent 432 aligned with the small-diameter waist-shaped hole 421, forming a low-pressure micro-gas seal. The gas overflows along the gap between the feed guide column 32 and the outer pipe 31, forming a micro-bubble film on the inner wall of the reactor, which effectively prevents the calcium carbonate slurry from entering the gap. This state allows the mechanism to enter the anti-blocking standby state without interfering with the stirring inside the reactor.

[0038] Meanwhile, the microbubbles that overflow and rise along the reactor wall will generate local airflow disturbances, breaking the fluid boundary layer with slower flow rate at the side wall, causing the slurry that was originally easy to stagnate and adhere to the inner wall of the reactor body 1 to be re-rolled into the central main stirring zone, thereby improving the overall mixing uniformity of the material.

[0039] When deep slurry needs to be injected, the switching component 5 is activated first. The linear cylinder 51 actuates, and through the transmission of the lifting transmission plate 52 and the right-angle connecting rod 53, the sealing seat 43 is forced to rotate on a fixed axis. The rotation aligns the air passage with the large-diameter vent 422, and a large amount of high-pressure gas rushes in to form a high-pressure sweeping airflow. Immediately afterwards, the control push cylinder 37 is activated, driving the feed guide column 32 to extend horizontally into the inner central area. During the extension process, the high-pressure gas in the chamber continuously sprays into the reactor along the outer wall of the feed guide column 32, forming a high-pressure gas film covering its surface, ensuring that the slurry is difficult to adhere to the surface of the feed guide column 32 in the penetration path.

[0040] When the feed guide column 32 reaches the predetermined deep injection position, its internal valve drive component 34 drives the valve stem 341 to retract and open the concave valve port 321. The activator concentrate is directly injected into the deep calcium carbonate slurry. At this time, with the mechanical stirring of the stirring shaft 28, which is uprighted by the bottom support 210, and the multi-layer agitator 29, the activator directly contacts and reacts with the medium and deep materials. This deep directional injection method effectively changes the phenomenon of delayed deep reaction caused by the activator being added from the top in the traditional process. It can achieve efficient mixing of activator and slurry without relying on the main stirring paddle for a long time of high-intensity overall tumbling, thereby improving activation efficiency and shortening the overall reaction time.

[0041] After the injection process is completed, the valve drive 34 drives the valve stem 341 to return to the flush and closed state to cut off the feed. Subsequently, the cylinder 37 pulls the feed guide column 32 back in the opposite direction. During the retraction, since the anti-backflow component 4 remains in the ventilated state, high-pressure airflow continues to spray out from the gap to prevent slurry backflow and fill the gap. When the feed guide column 32 is completely retracted into the outer pipe 31 and the front end is flush with the inner wall of the reactor again, the switching component 5 performs a reset action, forcing the sealing seat 43 to rotate and reset in the opposite direction through reverse transmission. At this time, the ventilated channel rotates back and aligns with the small-diameter waist-shaped hole 421, and the air path returns to the initial low-flow and low-pressure state, completing the entire directional injection and air path switching operation cycle.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A carbonation reactor for the preparation of nano-calcium carbonate, characterized in that, include Reactor body (1); A stirring assembly (2) is mounted on the reactor body (1); The uniform injection assembly (3) is provided on the side wall of the reactor body (1), including a pipe unit fixed on the side wall, a feeding unit slidably nested in the pipe unit, and a power unit that drives the feeding unit to move relative to the pipe unit. The feeding unit has a valve port that is controlled to open and close, which is used to be driven to extend into the reactor body (1) for directional injection. The anti-backflow component (4) is set at one end of the uniform injection component (3), including a ventilation unit fixed to the end of the pipeline unit and a sealing unit rotatably sleeved on the ventilation unit. The ventilation unit and the sealing unit have ventilation channels with different apertures corresponding to each other. The sealing unit is connected to an external air source and is used to rotate and switch the gas flow rate inside the pipeline unit so as to form a high and low pressure air seal to prevent slurry backflow during injection and retraction. The switching component (5) is located on one side of the anti-backflow component (4) and includes a linear power unit and a transmission unit driven by it. The transmission unit is limited by the blocking unit to extend and retract horizontally, so as to make the blocking unit rotate on a fixed axis to achieve the switching of ventilation state.

2. The carbonization reactor for the preparation of nano-calcium carbonate according to claim 1, characterized in that: The piping unit includes an outer pipe (31) and a mounting plate (33). The outer pipe (31) horizontally penetrates the side wall of the reactor body (1) and is fixed, with both ends connected. Two outer pipes (31) are evenly spaced and arranged on the side wall of the reactor body (1). The mounting plate (33) is fixed to the inner wall of the outer pipe (31). The feeding unit includes a feeding guide post (32), which is nested inside the outer pipe (31). The feeding guide post (32) and the outer pipe (31) are connected to the outer pipe (31). An installation chamber is provided between one end of the outer pipe (31), and the installation plate (33) is located in the installation chamber. The power unit includes a valve drive (34) and a push cylinder (37). The valve drive (34) is horizontally fixed to the side of the installation plate (33). The push cylinder (37) is located on one side of one end of the outer pipe (31), and its telescopic end is connected to one end of the valve drive (34) for pushing the feed guide column (32) to move relative to the outer pipe (31).

3. The carbonization reactor for the preparation of nano-calcium carbonate according to claim 2, characterized in that: The feed guide column (32) has a concave valve port (321) at one end that extends into the reactor body (1). The feed guide column (32) has a feed groove (322) inside. The valve drive (34) has a valve stem (341) fixed at the telescopic end. The valve stem (341) initially passes through the feed groove (322) and blocks the concave valve port (321). The feed unit also includes a bellows (35) and a liquid supply connector (36). The bellows (35) is fixed at one end of the feed guide column (32) located in the installation chamber and is correspondingly connected to the feed groove (322). One end of the bellows (35) is connected to the liquid supply connector (36). The liquid supply connector (36) is vertically upward and passes through the external pipe (31) for connection with an external activator liquid supply device.

4. The carbonization reactor for the preparation of nano-calcium carbonate according to claim 2, characterized in that: The anti-backflow assembly (4) also includes a mounting frame (41) and a bearing seat (45). The mounting frame (41) is fixed to the side of the reactor body (1). The ventilation unit includes a ventilation ring (42), which is fixed to one end of the external pipe (31). The sealing unit includes a sealing seat (43), which is annular. An annular sleeve is provided on the side of the sealing seat close to the ventilation ring (42). The annular sleeve is movably fitted on the ventilation ring (42) and is used to rotate along the axis of the ventilation ring (42). The sealing seat (43) is supported and connected to the mounting frame (41) through the bearing seat (45). The push cylinder (37) is fixed to the mounting frame (41) by a bracket. The telescopic end of the push cylinder (37) passes through the sealing seat (43), the ventilation ring (42), and is connected to the valve drive (34) in sequence.

5. A carbonation reactor for the preparation of nano-calcium carbonate according to claim 4, characterized in that: Waist-shaped holes (421) are evenly opened along the side of the ventilation ring (42), and ventilation holes (422) are evenly opened through the side of the ventilation ring (42). The ventilation holes (422) and the waist-shaped holes (421) are arranged adjacent to each other at intervals, and the diameter of the ventilation holes (422) is larger than the diameter of the waist-shaped holes (421). The sealing unit also includes sealing plugs (44). On the side of the sealing seat (43) near the ventilation ring (42), a plurality of ventilation nozzles (432) and a plurality of sealing plugs (44) are evenly arranged circumferentially. The sealing plugs (44) and the ventilation nozzles (432) are arranged adjacent to each other at intervals. In the initial state, the ventilation nozzles (432) are connected to the waist-shaped holes (421), and the ventilation holes (422) are sealed and closed by the sealing plugs (44). The side of the sealing seat (43) is connected and fixed with an air supply connector (431).

6. The carbonization reactor for the preparation of nano-calcium carbonate according to claim 5, characterized in that: A spiral groove (433) is provided along the circumference of the annular sleeve. The linear power unit includes a linear cylinder (51). The transmission unit includes a lifting transmission plate (52), a right-angle connecting rod (53), and a guide sleeve (54). The linear cylinder (51) is vertically fixed on the mounting frame (41). The lifting transmission plate (52) is vertically fixed at the telescopic end of the linear cylinder (51). The guide sleeve (54) is fixed on the mounting frame (41). The horizontal end of the right-angle connecting rod (53) is movably inserted through the guide sleeve (54) to limit the right-angle connecting rod (53) to only achieve horizontal movement. The right-angle connecting rod (53) is used to connect the lifting transmission plate (52) and the spiral groove (433).

7. A carbonation reactor for the preparation of nano-calcium carbonate according to claim 6, characterized in that: The lifting transmission plate (52) is provided with two upper and lower drive grooves (521). The vertical end of the right-angle connecting rod (53) is vertically fixed with a sliding pin shaft. The sliding pin shaft extends into the drive groove (521) and is used to convert the vertical movement of the linear cylinder (51) into the horizontal extension and retraction of the right-angle connecting rod (53). One end of the horizontal end of the right-angle connecting rod (53) is fixed with a trigger shaft pin (531) set on a vertical line. The trigger shaft pin (531) extends into the spiral groove (433) and is used to drive the sealing seat (43) supported and restricted by the bearing seat (45) to rotate on a fixed axis.

8. A carbonization reactor for the preparation of nano-calcium carbonate according to claim 1, characterized in that: The stirring assembly (2) includes a support frame (21), a drive motor (22), a stirring shaft (28), a stirrer (29), and a bottom support (210). The support frame (21) is fixed on the reactor body (1), the drive motor (22) is horizontally fixed on the support frame (21), the stirring shaft (28) extends vertically into the reactor body (1), and several stirrers (29) are spaced apart along the vertical direction of the stirring shaft (28). The bottom support (210) is fixed to the bottom of the inner wall of the reactor body (1), and the bottom end of the stirring shaft (28) has a spherical positioning point, which cooperates with the bottom support (210) to straighten the stirring shaft (28).

9. A carbonation reactor for the preparation of nano-calcium carbonate according to claim 8, characterized in that: The stirring assembly (2) further includes an upper coupling (23), a reducer (24), a lower coupling (25), and a drive shaft (26). The upper coupling (23) is connected to the output end of the drive motor (22). The reducer (24) is connected to the end of the upper coupling (23) away from the drive motor (22). The lower coupling (25) is connected to the output end of the reducer (24). The drive shaft (26) is connected to the end of the lower coupling (25) away from the reducer (24). The end of the drive shaft (26) away from the lower coupling (25) is connected to the stirring shaft (28).

10. A carbonation reactor for the preparation of nano-calcium carbonate according to claim 9, characterized in that: The stirring assembly (2) also includes a mechanical seal (27), which is located at the top of the reactor body (1). The drive shaft (26) passes through the mechanical seal (27) and extends into the reactor body (1).

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