Aging equipment for processing nano calcium carbonate

Abstract

The invention belongs to the technical field of nano calcium carbonate processing, and discloses aging equipment for processing nano calcium carbonate, which comprises an aging tank body, and further comprises an initial aging assembly which is arranged on the aging tank body and is used for playing an initial mild circulation effect in the initial aging of nano calcium carbonate and maintaining the integrity of crystals. By means of multi-stage composite stirring, the defect that existing aging equipment is poor in adaptability is overcome in a targeted mode, precise adaptation of all aging stages of nano calcium carbonate slurry with different viscosities is achieved, metastable-state crystal vaterite / aragonite can be prevented from being broken through mild circulation of a hollow pipe and a spiral blade at the early stage of aging, and the integrity of crystals is maintained; in the middle stage, the rotation of the inclined cutter and the slurry dispersing height can be adjusted by means of the electric cylinder, the shearing dispersion of the high-viscosity slurry is enhanced, a foundation is laid for hard agglomeration breaking, and in the later stage, the large-range low-shearing paddles are used for protecting the shaped calcite crystals, ensuring the ageing sufficiency and providing a stable material environment for subsequent quality optimization.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of nano calcium carbonate processing, and specifically relates to a ripening equipment for processing nano calcium carbonate. BACKGROUND

[0002] Carbonates are the core category in the field of inorganic chemical industry, covering barium carbonate, barium titanate, magnesium carbonate, calcium carbonate and various compounds, and are widely used in electronic, ceramic, plastic, pharmaceutical and other industries - such as barium carbonate for manufacturing barium salt, ceramic capacitor, barium titanate is the key raw material of multilayer ceramic capacitor, and nano calcium carbonate as a very special sub-category of carbonates, with 1-100 nm nano-sized particle size, high specific surface area and surface activity, becomes the core filler of plastic reinforcement, paint toughening, pharmaceutical carrier and other high-end scenarios. However, whether it is nano calcium carbonate or other carbonates, the primary particles generated by synthesis reaction (such as carbonization, hydrothermal method) generally have problems such as incomplete crystal structure, uneven particle size distribution and easy agglomeration, among which nano calcium carbonate has more prominent agglomeration phenomenon due to its extremely small particle size and higher surface energy, and direct processing will lead to performance fluctuations of downstream products, so ripening becomes a key process to optimize its quality, and the performance of the ripening equipment directly determines the final quality of the nano calcium carbonate.

[0003] The mainstream ripening method of the existing nano calcium carbonate ripening equipment adopts a vertical rotating shaft penetrating through the center of the cavity, a driving motor connected at the bottom, and spiral blades distributed on the rotating shaft. During operation, the blades push the slurry at the bottom to the top by the helix angle, and the slurry falls under gravity to form a bottom-middle-top-bottom cycle, which can theoretically improve the macro-uniformity by 40%-50%. However, for different viscosity (1000-3000 cP) slurries, although the existing equipment can achieve basic dispersion, in actual processing, especially when dealing with different viscosity nano calcium carbonate slurries, the single turning path and planar structure of the existing ripening equipment blades lack adaptability to complex working conditions and changes in the characteristics of different viscosity materials, which makes it difficult to effectively ripen in different degrees of ripening treatment when dealing with such special materials as different viscosity nano calcium carbonate, and when dealing with high viscosity slurry, it is easy to form a 1-1.5 mm wrapping layer on the blades, reducing the effective pushing area from 80% to less than 50%, and the angle between the cavity bottom / side wall forms a retention area, the retention slurry takes a long time to ripen for 2-3 hours, and it is easy to form super 50 nm large particle agglomerates, affecting the mixing uniformity, conveying efficiency and ripening effect of the material. SUMMARY

[0004] To solve the problems raised in the background art, the application provides a ripening equipment for processing nano calcium carbonate, which comprises a ripening tank body, and further comprises: An initial ripening assembly is arranged on the ripening tank body and used for initial mild circulation in the preliminary ripening of nano calcium carbonate to maintain the integrity of the crystal. The initial aging assembly comprises an empty pipe, which is rotatably connected to the aging tank body, and a transmission gear connected to the empty pipe. A hollow sleeve is connected to the hollow aging tank body, and the hollow sleeve is located outside the empty pipe. A spiral blade is connected to the empty pipe and cooperates with the hollow sleeve. The middle aging assembly is arranged inside the aging tank body and has a reinforcing dispersion effect during the middle aging of the slurry. The late aging assembly is arranged outside the empty pipe and maintains a stable flow field during the late aging. The corner scraping assembly is arranged inside the aging tank body and is used for scraping and cleaning the residual slurry at the corner of the inner cavity of the aging tank body. The control assembly is arranged on the aging tank body and is used for providing power to the initial aging assembly and the middle aging assembly.

[0005] Preferably, the middle aging assembly comprises a support pipe arranged inside the aging tank body, and an inclined knife fixedly installed on the surface of the support pipe. A connecting gear is connected to the support pipe, and a connecting rod is rotatably connected to the support pipe. The connecting rod is rotatably connected to the connecting gear through a ball. The top of the aging tank body controls the lifting of the support pipe through an up-down control member.

[0006] Preferably, the up-down control member comprises a support plate fixedly installed on the top of the aging tank body. An electric cylinder is fixedly installed at the bottom of the support plate. A pulling plate is fixedly installed at the extension end of the electric cylinder. The bottom of the pulling plate is fixedly installed with the top of the connecting rod.

[0007] Preferably, the late aging assembly comprises a support sleeve sleeved outside the empty pipe. A linkage plate is sleeved on the connecting gear. The top of the linkage plate is rotatably connected to the bottom of the support sleeve through a ball. A clamping plate is connected to the support sleeve. A square block is connected to the empty pipe. A square hole adapted to the square block is formed in the clamping plate. A large-range paddle is connected to the clamping plate.

[0008] Preferably, the corner scraping assembly comprises a rotating gear ring rotatably connected inside the aging tank body. The outer surface of the connecting gear is adapted to the inner ring of the rotating gear ring. A scraping support plate is connected to the bottom of the rotating gear ring. A scraping strip is connected to the scraping support plate. The scraping strip is attached to the inner wall of the aging tank body.

[0009] Preferably, the control assembly comprises a motor installed on the aging tank body through a mounting plate. The outer surface of the output shaft of the motor is connected with a driving gear. The driving gear is meshed with the transmission gear. The surface of the output shaft of the motor is connected with a driving gear located inside the aging tank body. The outer surface of the driving gear is meshed with the inner ring of the rotating gear ring.

[0010] Preferably, the bottom of the transmission gear is rotatably connected to the aging tank body by balls to support the rotation of the empty pipe.

[0011] Preferably, the bottom of the aging tank body is further fixedly installed with an ultrasonic dispersion assembly, the ultrasonic dispersion assembly comprises an ultrasonic nanodisperser, the ultrasonic nanodisperser is fixedly installed on the bottom of the aging tank body, the bottom of the aging tank body is fixedly installed with a horn, and the horn is inserted into the inside of the aging tank body.

[0012] Preferably, the empty pipe is connected with a baffle, and the baffle is located at the bottom of the block.

[0013] Preferably, the inside of the empty pipe is hollow, and hot steam is sprayed into the aging tank body from the holes on the surface of the empty pipe to heat and rapidly heat the slurry in the aging process.

[0014] Compared with the prior art, the present application has the following advantages: The present application solves the defects of poor adaptability of existing aging equipment through multi-stage composite stirring, realizes precise adaptation to different viscosity nanometer calcium carbonate slurry in the whole aging stage, avoids the breakage of metastable crystal aragonite / calcite in the early aging stage through the gentle circulation of the empty pipe and the spiral blade, maintains the integrity of the crystal, and lays a foundation for breaking hard agglomeration in the middle stage by means of the rotation of the adjustable bevel of the electric cylinder and the dispersion height of the slurry, and protects the shaped calcite crystal through a large range of low shear paddle in the later stage, so as to ensure the sufficiency of aging and provide a stable material environment for subsequent quality optimization.

[0015] Further, on the basis of multi-stage stirring, a corner scraping assembly of a rotating tooth ring and a scraping strip is additionally arranged, the dead angle scraping of the rotating tooth ring and the scraping strip can reduce the corner retention area of the side wall of the cavity of the aging tank, reduce the generation of large particle agglomerates, the scraping action can weaken the adhesion of the slurry on the wall of the cavity, indirectly reduce the formation of the slurry wrapping layer, effectively restore the effective pushing area, reduce the radial temperature difference of the slurry to 1-2 DEG C, significantly improve the material mixing uniformity and conveying efficiency, and solve the problems of uneven aging effect and energy waste caused by retention and adhesion of the existing equipment.

[0016] Furthermore, by using an ultrasonic nano-dispersant and an ultrasonic dispersion component with an amplitude transformer, and adjusting the power in stages (30%-40% power / 35-40kHz in the initial stage, 70%-90% power / 28-32kHz in the middle stage, and 20%-30% power / 30-35kHz in the later stage), a synergistic effect of macroscopic stirring and microscopic ultrasonic dispersion is achieved. In the initial stage, the ion concentration difference of the slurry can be reduced to less than 1%, providing a uniform ion environment for crystal growth; in the middle stage, the cavitation effect is used to improve the breaking rate of hard agglomerates; and in the later stage, micro-vibration is used to reduce the secondary agglomeration rate to below 5%, thereby improving the aging effect of nano-calcium carbonate. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the present invention; Figure 3 This is a three-dimensional schematic diagram of the mid-term aging component of the present invention; Figure 4 This is a three-dimensional schematic diagram of the corner scraping component of the present invention; Figure 5 This is a three-dimensional schematic diagram of the initial aging component of the present invention; Figure 6 This is a three-dimensional schematic diagram of the upper and lower control components of the present invention; Figure 7 This is a three-dimensional cross-sectional schematic diagram of the post-aging component of the present invention. In the figure: 1. Aging tank; 2. Initial aging component; 21. Empty tube; 22. Transmission gear; 23. Hollow sleeve; 24. Spiral blade; 3. Intermediate aging component; 31. Support tube; 32. Angled blade; 33. Connecting gear; 34. Connecting rod; 35. Upper and lower control components; 351. Support plate; 352. Electric cylinder; 353. Pulling plate; 4. Post-aging component; 41. Support sleeve; 42. Linkage plate; 43. Clamping plate; 44. Block; 45. Square opening; 46. Large-range paddle blade; 5. Corner scraping component; 51. Rotating gear ring; 52. Scraping support plate; 53. Scraping strip; 6. Control component; 61. Motor; 62. Drive gear; 63. Drive gear; 7. Ultrasonic dispersion component; 71. Ultrasonic nano-dispersant; 72. Amplitude rod; 8. Baffle. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] likeFigures 1 to 7 As shown, the application provides a ripening device for processing nano calcium carbonate, which comprises a ripening tank body 1, and further comprises: An initial ripening assembly 2 is arranged on the ripening tank body 1, which is used to achieve the effect of initial gentle circulation in the preliminary ripening of nano calcium carbonate, maintain the integrity of the crystal, and avoid the destruction of the primary calcium carbonate crystal just generated by turbulent flow; The initial ripening assembly 2 comprises an empty pipe 21 which is rotatably connected to the ripening tank body 1, a transmission gear 22 connected to the empty pipe 21, a hollow sleeve 23 connected to the hollow pipe 21 in the hollow pipe 21, the hollow sleeve 23 located outside the empty pipe 21, and a spiral blade 24 connected to the hollow sleeve 23, which slowly pushes the slurry at the bottom to flow upward, and the slurry at the top falls naturally, forming a stable circulation of bottom-middle-top. A middle ripening assembly 3 is arranged inside the ripening tank body 1, which is used to achieve the effect of strengthening dispersion in the middle ripening of the slurry; A late ripening assembly 4 is arranged outside the empty pipe 21, which maintains a stable flow field in the late ripening and avoids the breakage of the crystal caused by excessive stirring; An edge scraping assembly 5 is arranged inside the ripening tank body 1, which is used to scrape and clean the slurry remaining in the corner of the inner cavity of the ripening tank body 1; A control assembly 6 is arranged on the ripening tank body 1, which is used to provide power for the initial ripening assembly 2 and the middle ripening assembly 3.

[0020] Specifically, the ripening tank body 1 is a nano calcium carbonate ripening device commonly used in the prior art, which has a vertical cylindrical cavity as the main structure, a conventional temperature and humidity monitoring interface and a heating jacket installation site are reserved on the inner wall of the cavity, a conventional discharge valve is arranged at the bottom, a feed inlet and an access door are arranged on the right side, the top bearing is rotatably connected to the top of the ripening tank body 1, and the transmission gear 22 is connected to the control assembly 6, the hollow sleeve 23 is a ring structure fixed to the inner wall of the ripening tank body 1, the inner diameter is slightly larger than the outer diameter of the empty pipe 21, the gap between the inner wall and the spiral blade 24 is controlled to be 1-2 mm, and the turbulent intensity of the slurry flow can be weakened by the hollow sleeve 23; the spiral blade 24 is designed with a gradually changing pitch, the large pitch at the bottom can slowly lift the slurry deposited at the bottom, and the small pitch at the top can slow down the falling speed of the slurry, which, in combination with the flow guiding effect of the hollow sleeve 23, can stabilize the circulation flow rate of the slurry and form a gentle circulation of bottom-middle-top, thereby avoiding the destruction of the initial metastable crystal by strong turbulent flow and ensuring the macroscopic uniformity of the slurry, which can maintain the integrity of the crystal and lay a stable material foundation for the subsequent middle ripening and late ripening.

[0021] As Figures 2 to 4As shown, the middle aging assembly 3 comprises a support pipe 31 arranged inside the aging tank body 1, the surface of the support pipe 31 is fixedly installed with an inclined knife 32, the support pipe 31 is connected with a connecting gear 33, the support pipe 31 is rotationally connected with a connecting rod 34, the connecting rod 34 is rotationally connected with the connecting gear 33 through a ball, and the top of the aging tank body 1 controls the lifting of the support pipe 31 through an up-down control member 35.

[0022] Specifically, the middle aging assembly 3 does not work independently, but forms a synergistic stirring system of macroscopic circulation and local strengthening with the initial aging assembly 2. The empty pipe 21 and the spiral blade 24 of the initial aging assembly 2 maintain a gentle large circulation from bottom to middle to top, ensuring uniform flow of the slurry in the whole cavity of the aging tank body 1. The inclined knife 32 of the middle aging assembly 3 performs local shear dispersion in the core area of the high-concentration agglomeration zone in the middle of the circulation path, which is equivalent to adding a dispersion node in the large circulation. The small particle agglomerates broken by the inclined knife 32 quickly diffuse to the whole cavity along the large circulation, avoiding the re-aggregation of local agglomerates. At the same time, the stirring action of the inclined knife 32 can weaken the laminar flow effect that may be formed by the initial circulation, and the flow stratification of high-viscosity slurry that may occur, reduce the slurry concentration difference, and provide a consistent material environment for uniform crystal growth. The rotation of the middle aging assembly 3 is controlled by the meshing time of the connecting gear 33 and the rotating tooth ring 51 controlled by the up-down control member 35. When the up-down control member 35 controls the middle aging assembly 3 to move upwards and meshes with the rotating tooth ring 51, the slurry in the middle aging is sheared and dispersed by the transmission force.

[0023] As shown in Figures 2 to 4 The up-down control member 35 comprises a support plate 351 fixedly installed at the top of the aging tank body 1, the bottom of the support plate 351 is fixedly installed with an electric cylinder 352, the telescopic end of the electric cylinder 352 is fixedly installed with a pulling plate 353, and the bottom of the pulling plate 353 is fixedly installed with the top of the connecting rod 34.

[0024] Specifically, during the middle aging stage of the nano calcium carbonate, the upper and lower control members 35 realize the meshing linkage of the connecting gear 33 and the rotating gear ring 51 through the precise extension and retraction of the electric cylinder 352. After the electric cylinder 352 pulls the pulling plate 353 connected by the plurality of connecting rods 34, the plurality of connecting rods 34 pull the connecting gear 33 to move upward to mesh with the rotating gear ring 51. When the connecting gear 33 meshes with the rotating gear ring 51, the motor 61 of the control assembly 6 drives the rotating gear ring 51 to rotate through the driving gear 63. The rotating gear ring 51 drives the connecting gear 33 and the support pipe 31 to rotate synchronously through the meshing transmission. The inclined knife 32 fixed on the surface of the support pipe 31 is made of wear-resistant ceramic, and the blade angle is 30°. The inclined knife 32 rotates with the support pipe 31 to form efficient shearing on the surrounding slurry. On the one hand, the blade of the inclined knife 32 can directly cut off the soft agglomerates of 1-3 μm, and at the same time, the radial flow generated by the rotation drives the exchange of the slurry between the center and the side wall of the cavity, solves the problem of temperature difference of 3-5 ℃ between the center and the side wall of the existing aging equipment, and solves the problem of particle size stratification. On the other hand, the electric cylinder 352 can dynamically adjust the height of the support pipe 31 according to the aging process. During the first hour of the middle generation stage of the hard agglomerates, the support pipe 31 is maintained at the middle and lower positions at a height of 1 / 3 of the bottom of the cavity. The inclined knife 32 mainly acts on the high-concentration slurry area at the bottom. During the second hour of the middle generation stage of the hard agglomerates, the electric cylinder 352 drives the support pipe 31 to rise to the middle position at a height of 1 / 2 of the bottom of the cavity. The inclined knife 32 turns to process the dispersed body suspended in the middle part to avoid deposition at the bottom. In addition, the ball at the joint between the connecting rod 34 and the connecting gear 33 can greatly reduce the frictional resistance when the support pipe 31 rotates, so that the shearing torque loss of the inclined knife 32 is reduced by more than 15%. The connecting rod 34 inside the connecting gear 33 is connected with the connecting gear 33 through a bearing, so that the connecting gear 33 can smoothly mesh with the rotating gear ring 51, and the stable shearing efficiency can be maintained in the high-viscosity slurry. At the same time, the servo control characteristics of the electric cylinder 352 can realize point adjustment. If it is detected that the local concentration of the slurry is too high through the concentration sensor on the side wall of the aging tank 1, the support pipe 31 can be driven to rise and fall for 2-3 times. The local aggregation is broken through the up-down movement of the inclined knife 32, and the mixing uniformity is further improved. Finally, the hard agglomerate breakage rate during the middle aging stage is increased from 30%-40% of the existing equipment to more than 80%, which lays a foundation for the crystal stability during the subsequent late aging.

[0025] As shown in Figures 4 to 7 The late aging assembly 4 includes a support sleeve 41, the support sleeve 41 is sleeved outside the empty pipe 21, the connecting gear 33 is sleeved with a linkage plate 42, the top of the linkage plate 42 is rotatably connected with the bottom of the support sleeve 41 through a ball, the support sleeve 41 is connected with a clamping plate 43, the empty pipe 21 is connected with a block 44, the clamping plate 43 is provided with a square opening 45 matched with the block 44, and the clamping plate 43 is connected with a large-range paddle 46.

[0026] Specifically, the support sleeve 41 is made of 304 stainless steel, and the inner diameter is 2-3 mm larger than the outer diameter of the empty tube 21. When the sleeve is set, it maintains coaxial with the empty tube 21, which not only ensures that the support sleeve 41 can move smoothly along the empty tube 21 in the axial direction, but also avoids radial shaking that causes disturbance of the slurry. The square block 44 is a cube structure, which is fixed by being integrally formed with the empty tube 21. The outer surface is polished to reduce the frictional resistance when the square block 44 is clamped with the square hole 45. The clamping plate 43 is a circular stainless steel plate, and a square hole 45 is formed in the center. The size of the square hole 45 is adapted to the square block 44, and the side length of the square hole 45 is 0.5-1 mm larger than that of the square block 44, which ensures that there is no relative sliding after clamping, and the torque can be transmitted synchronously. When the post-aging assembly 4 is not started, the support sleeve 41 is in a high position under the support of the linkage plate 42, and the square hole 45 is separated from the square block 44. The working start time and linkage logic of the post-aging assembly 4 need to be linked with the action of the middle-aging assembly 3. When the nano calcium carbonate completes the middle-aging, the control assembly 6 sends a post-start signal. At this time, the electric cylinder 352 of the up-down control 35 drives the support tube 31 to move downward, and the connecting gear 33 is synchronously moved downward. The connecting gear 33 is further moved downward to remove the support force of the support sleeve 41 through the linkage relationship of the linkage plate 42, so that the support sleeve 41, the clamping plate 43, and the wide-range paddle 46 are moved downward. The support sleeve 41 moves downward along the empty tube 21 in the axial direction until the square hole 45 of the clamping plate 43 is completely clamped into the square block 44 and falls on the baffle 8 to complete the linkage switching of the wide-range paddle 46. The rotating power of the empty tube 21 is transmitted to the support sleeve 41, and then the clamping plate 43 and the wide-range paddle 46 are synchronously rotated at the same speed as the empty tube 21, which is maintained at 60-80 r / min, which is lower than the rotating speed of the middle-aging inclined cutter 32, to avoid high shear. When the wide-range paddle 46 rotates, it can push the slurry to form a slow horizontal circular flow and a slight up-down disturbance, which not only maintains the slurry in a suspended state to prevent crystal deposition and secondary agglomeration, but also avoids damage to the shaped crystals by strong shear force.

[0027] As shown in Figures 2 to 4 The edge scraping assembly 5 includes a rotating tooth ring 51, which is rotatably connected to the inside of the aging tank body 1. The outer surface of the connecting gear 33 is adapted to the inner ring of the rotating tooth ring 51. The bottom of the rotating tooth ring 51 is connected with a scraping support plate 52, and the scraping support plate 52 is connected with a scraping strip 53. The scraping strip 53 is attached to the inner wall of the aging tank body 1.

[0028] Specifically, the rotating gear ring 51 is rotatably connected with the annular step of the inner wall of the aging tank body 1 through a plurality of rolling balls. In actual operation, the rotating gear ring 51 is synchronously rotated with the air pipe 21 under the driving of the driving gear 63 connected with the motor 61, so that the rotating gear ring 51 synchronously drives the scraping support plate 52 and the scraping strip 53 to make a circular motion along the inner wall of the aging tank body 1. For the slurry attached to the side wall, the scraping strip 53 can directly scrape off a 1-1.5 mm thick attached layer, and the scraped slurry falls into the middle part of the cavity under the action of gravity to participate in circulation. For the angle area of the bottom and the side wall, the fan-shaped extension end of the scraping support plate 52 can penetrate into the angle gap to forcibly strip the deposited super 50 nm large particle agglomerates, so as to avoid the formation of hard agglomeration due to long residence time of 2-3 h.

[0029] As shown in Figures 2 to 4 , the control assembly 6 includes a motor 61, the motor 61 is installed on the aging tank body 1 through a mounting plate, the outer surface of the output shaft of the motor 61 is connected with a driving gear 62, the driving gear 62 is meshed with the transmission gear 22, the surface of the output shaft of the motor 61 is connected with a driving gear 63 located inside the aging tank body 1, and the outer surface of the driving gear 63 is meshed with the inner ring of the rotating gear ring 51.

[0030] Specifically, the control assembly 6 as the power core of the equipment needs to adapt to the dynamic working conditions of the whole aging stage of nano calcium carbonate, including low speed and gentle circulation in the initial stage, high speed and intensive dispersion in the middle stage, and medium speed and stable flow field in the later stage. The motor 61 selects a three-phase asynchronous variable frequency motor 61, which can be integrated with the PLC control system on the side operating panel of the aging tank body 1 to preset different rotation speed parameters of the aging stages. In order to adapt to the power requirements of different aging stages, the speed regulation logic of the control assembly 6 is linked with each component: in the initial aging stage of 0-1.5 h, the motor 61 is set to rotate at 60 r / min, after being decelerated by the driving gear 62 and the transmission gear 22, the air pipe 21 drives the spiral blade 24 to rotate at 30 r / min for gentle circulation, and the driving gear 63 increases the speed of the rotating gear ring 51, so that the rotating gear ring 51 drives the scraping strip 53 to rotate at 80 r / min for low-speed scraping to avoid splashing of the low-viscosity slurry in the initial stage; in the middle aging stage of 1.5-4 h, the motor 61 is increased to rotate at 120 r / min, the air pipe 21 is increased to rotate at 60 r / min to enhance the pushing efficiency of the spiral blade 24, and the rotating gear ring 51 is increased to rotate at 160 r / min to strengthen the scraping effect of the scraping strip 53 on the high-viscosity slurry, and the driving rotating gear ring 51 links the connecting gear 33 of the middle aging assembly 3 to realize the shearing and dispersion of the bevel cutter 32. In the later aging stage of 4-6 h, the motor 61 is reduced to rotate at 80 r / min, the air pipe 21 is rotated at 40 r / min to cooperate with the large-range paddle 46 of the later aging assembly 4 to maintain a stable flow field, and the rotating gear ring 51 is rotated at 100 r / min for low-speed scraping to avoid disturbing the shaped crystals. The control component 6 uses a single motor 61 with dual drive design to achieve power reuse between the initial aging component 2 and the corner scraping component 5.

[0031] like Figures 1 to 4 As shown, the bottom of the transmission gear 22 is rotatably connected to the aging tank 1 via ball bearings to support the rotation of the empty tube 21.

[0032] Specifically, the ball bearings at the bottom of the transmission gear 22 provide distributed support force in the support of the transmission gear 22, effectively improving the smoothness of the transmission gear 22 on the aging tank 1.

[0033] like Figures 1 to 4 As shown, an ultrasonic dispersion component 7 is also fixedly installed at the bottom of the aging tank 1. The ultrasonic dispersion component 7 includes an ultrasonic nano-disperser 71, which is fixedly installed at the bottom of the aging tank 1. An amplitude transformer 72 is fixedly installed at the bottom of the aging tank 1 and is inserted into the interior of the aging tank 1.

[0034] Specifically, the ultrasonic nano-dispersant 71 uses an industrial-grade high-frequency device with a rated power of 1500-3000W and a frequency adjustment range of 20-40kHz. It supports stepless power adjustment from 0-100%. The control port of the ultrasonic nano-dispersant 71 is connected to the main control system of the aging tank 1 through a shielded cable. It can receive signals from the aging stage, such as initial / middle / late stage trigger commands, and realize automatic parameter matching. In the actual aging process, the ultrasonic dispersion component 7 works in conjunction with the preceding initial / middle / late aging components 4 to achieve precise micro-dispersion in stages. In the initial aging stage (0-1.5h): the main control system triggers the ultrasonic nano-dispersant 71 to enter a mild mode, with the power adjusted to 30%-40% (450-1200W) and the frequency set to 35-40kHz. Under these parameters, the micro-cavitation effect generated by the amplitude transformer 72 can drive the slurry molecules to vibrate at the molecular level, breaking down Ca2+. 2+ CO3 2- Localized ion aggregation, such as areas with excessively high ion concentration at the edge of the cavity, combined with the bottom-to-middle-to-top temperature and circulation of the initial aging component 2, reduces the ion concentration difference from more than 5% in existing equipment to less than 1%, while avoiding the impact of high-power ultrasound on metastable aragonite / spherical crystals and maintaining crystal integrity. Mid-aging 1.5-4h: the ultrasonic nanodisperser 71 is switched to the strengthening mode, the power is raised to 70%-90% 1050-2700W, and the frequency is adjusted to 28-32kHz. The cavitation bubble breakage impact force in this frequency range is the strongest, up to 1000atm. The energy released by the amplitude horn 72 can directly break the hydrogen bonds and van der Waals forces of 1-5pm hard agglomerates, combined with the macroscopic shearing of the mid-aging assembly 3 oblique knife 32, the hard agglomerate breakage rate is increased to more than 80%; at the same time, high-frequency vibration can weaken the adhesion of the slurry on the surface of the oblique knife 32, and auxiliary reduce the thickness of the wrapped layer of the blade; Late aging 4-6h: the disperser is switched to the stable mode, the power is reduced to 20%-30% 300-900W, and the frequency is maintained at 30-35kHz. At this time, the amplitude horn 72 only produces micro-vibration, which can prevent the bottom calcite crystals from depositing and forming loose agglomerates due to gravity, combined with the macroscopic stirring of the large-range paddle 46 of the late-aging assembly 4, the secondary agglomeration rate is reduced; at the same time, the micro-cavitation effect can accelerate the removal of free water on the surface of the crystals, reducing the formation of hydrogen bond bridges, reducing the risk of agglomeration in the subsequent drying link; In addition, the surface of the amplitude horn 72 is sandblasted to reduce the probability of slurry adhesion; the ultrasonic nanodisperser 71 also has the functions of automatically reducing power when the temperature of the amplitude horn 72 exceeds 60°C and reducing power to less than 10% when the slurry liquid level is too low, avoiding equipment failure and ensuring long-term stable cooperation with the aging tank 1, ultimately realizing the aging effect of macro-circulation uniformity and micro-dispersion thoroughness, meeting the quality requirements of high-end nano calcium carbonate.

[0035] As shown in Figures 5 to 7 The baffle 8 is connected to the air pipe 21, and the baffle 8 is located at the bottom of the block 44.

[0036] Specifically, the baffle 8 is made of stainless steel material of the same origin as the air pipe 21, and the baffle 8 is fixed on the outer wall of the air pipe 21 by full welding, and the welding position is located 10-15mm below the block 44. This spacing can ensure that the clamping plate 43 can be accurately fitted into the block 44 and contacted with the baffle 8 when the clamping plate 43 moves up and down, which can not only avoid collision damage caused by too small spacing when the clamping plate 43 is clamped with the block 44, but also prevent the clamping plate 43 from being suspended and the square hole 45 from being misaligned with the block 44 due to too large spacing; Firstly, the supporting and positioning effect of the clamping plate 43, before the late-aging assembly 4 is put into work, the clamping plate 43 can move axially along the air pipe 21 with the support sleeve 41, when the electric cylinder 352 drives the support sleeve 41 to descend, the bottom of the clamping plate 43 finally contacts with the top surface of the baffle 8, the baffle 8 provides upward supporting force for the clamping plate 43 through its rigidity, which accurately limits the downward stroke of the clamping plate 43; Secondly, the blocking and guiding effect of the spiral blade 24 on the slurry: in the initial aging stage, the air pipe 21 drives the spiral blade 24 to rotate, and the bottom slurry is slowly pushed upward through the spiral angle, forming a circulating flow from bottom to middle to top. If there is no baffle 8, the upwardly flowing slurry is easy to be impacted by the concentrated thrust of the spiral blade 24 and hit the square block 44 and the clamping plate 43, which is in a suspended state at this time, resulting in a sudden increase in the local slurry flow rate, forming a small range of turbulent flow, which may damage the initial metastable aragonite / calcite crystals; and the baffle 8 is located at the bottom of the square block 44 and above the spiral blade 24, which can directly block the upward slurry pushed by the spiral blade 24, so that the originally vertically upward slurry flow is converted into a gentle flow state along the edge of the baffle 8 downward diffusion under the blocking of the baffle 8, and the flow rate is reduced to 0.3-0.4 m / min, which meets the initial gentle circulation requirement, avoiding the impact of turbulent flow on the crystals.

[0037] As shown in Figures 1 to 7 The inside of the air pipe 21 is hollow, and the heating steam is sprayed into the aging tank body 1 from the holes on the surface of the air pipe 21 to heat and rapidly heat the slurry in the aging.

[0038] Specifically, the air pipe 21 is made of 304 stainless steel seamless pipe, and the overall wall thickness is 5-8 mm to ensure pressure resistance, which can withstand 0.3-0.5 MPa steam pressure. The top of the air pipe 21 is connected with a stainless steel rotary joint, and the sealing form is mechanical sealing to prevent steam leakage. The connection of the external steam source pipeline does not affect the synchronous rotation of the air pipe 21 with the control assembly 6 at a speed of 50-80 r / min, and can realize stable steam delivery, avoiding the winding or leakage problem of the traditional fixed pipeline due to rotation. Secondly, the hole diameter of the holes on the surface of the air pipe 21 is set to 2-3 mm. If the hole diameter is too small, it is easy to be blocked by steam condensate, and if the hole diameter is too large, the steam injection force is too strong, which is easy to impact the initial metastable crystals. In the actual aging process, the steam supply and the heating of the air pipe 21 need to be coordinated and dynamically adjusted according to the requirements of each stage. The specific cooperation logic is as follows: In the initial heating stage of aging, 0-0.5 h: the control assembly 6 triggers the steam valve to open, the steam pressure is adjusted to 0.2-0.3 MPa, the flow rate is set to 0.3 m³ / h, and the saturated steam at a temperature of 100°C is slowly sprayed into the slurry through the holes of the air pipe 21. The rotation of the air pipe 21 drives the steam to diffuse uniformly, and cooperates with the heat preservation jacket outside the aging tank body 1 to rapidly raise the temperature of the slurry from room temperature 25°C to the target aging temperature, such as 50°C for medical grade nano calcium carbonate, and the heating rate is stably at 1.5°C / min, avoiding the problem of slow external heating and slow internal heating lag of existing equipment; In the constant temperature stage of aging, 0.5-4 h: the steam pressure is reduced to 0.1-0.2 MPa, and the flow rate is adjusted to 0.1-0.2 m³ / h. Only a small amount of steam is used to supplement the temperature loss of the slurry due to heat dissipation, and the temperature of the cavity is stably maintained at 50±1°C, providing a stable temperature environment for hard agglomeration and crystal growth. The steam pressure is further reduced to below 0.1 MPa, and the flow rate is set to 0.05-0.1 m3 / h, only to maintain the basic insulation, to avoid temperature fluctuations causing changes in the adsorption of water on the crystal surface, affecting the subsequent drying effect.

[0039] The working process of the technical solution provided by the application is as follows: The application drives the motor 61 to drive the driving gear 62 to rotate, and after deceleration through the transmission gear 22, the hollow pipe 21 drives the spiral blade 24 to rotate at 30 r / min, slowly pushes the bottom slurry upward in the hollow sleeve 23, and the top slurry naturally falls under the action of gravity, forming a gentle circulation of bottom-middle-top. At the same time, the baffle 8 on the hollow pipe 21 blocks the upward slurry of the spiral blade 24, avoiding local turbulent impact on the metastable aragonite / calcite crystals, and the hollow pipe 21 is hollow inside, the top is connected to the external steam source through the rotary joint, the steam pressure is adjusted to 0.2-0.3 MPa at the beginning of aging, and the saturated steam is sprayed to the slurry through the holes on the surface of the hollow pipe 21, so that the slurry in the hollow sleeve 23 is raised from room temperature to the target temperature, and after 0.5 h, the steam pressure is reduced to 0.1-0.2 MPa to maintain constant temperature, and the ultrasonic dispersion assembly 7 enters the gentle mode, the amplitude rod 72 generates a micro-cavitation effect, breaks the local aggregation of Ca 2+ , CO3 2- ions, and reduces the concentration difference; at the same time, the rotating gear ring 51 rotates with the driving gear 63 at low speed, drives the scraping strip 53 to scrape the initial small amount of attached slurry on the inner wall of the aging tank 1, avoiding initial stagnation; In the middle of the aging, the servo electric cylinder 352 is triggered by the central control system to drive the pulling plate 353 to move upward, and the connecting rod 34 drives the support pipe 31 to move upward synchronously, so that the connecting gear 33 on the support pipe 31 is fully engaged with the rotating gear ring 51, and the engagement depth is 2 / 3 of the gear height; the motor 61 is speeded up to 120 r / min, and through the transmission of the driving gear 63, the rotating gear ring 51 and the connecting gear 33, the support pipe 31 drives the oblique knife 32 to rotate, forming high-efficiency shearing on the slurry, and adjusting the position of the oblique knife 32 according to the viscosity of the slurry during rotation; when the viscosity is greater than or equal to 3000 cP, the oblique knife 32 is lowered to 1 / 3 of the height from the bottom, focusing on breaking the hard agglomerates of 1-5 μm at the bottom; when the viscosity is 2500-3000 cP, the oblique knife 32 is raised to 1 / 2 of the height from the bottom, processing the suspended agglomerates in the middle; if the local concentration is too high, the electric cylinder 352 drives the support pipe 31 to rise and fall quickly for 2-3 times, breaking the local aggregation through the up-and-down movement of the oblique knife 32, and the ultrasonic dispersion assembly 7 is switched to the intensive mode, and the amplitude rod 72 releases a cavitation impact force of 1000 atm to directly break the hydrogen bonds and van der Waals forces of hard agglomerates; at the same time, the rotating gear ring 51 drives the scraping strip 53 to quickly scrape the attached layer on the side wall and the slurry stagnating at the bottom angle, avoiding the generation of particles larger than 50 nm; The total control system sends a late start signal, and the electric cylinder 352 of the up-down control element 35 drives the support pipe 31 to move downward, driving the connecting gear 33 to move downward synchronously. The connecting gear 33 removes the support force of the support sleeve 41 through the top ball connection of the linkage plate 42, and the support sleeve 41 descends along the air pipe 21 in the axial direction until the square hole 45 of the clamping plate 43 is fully clamped with the square block 44 on the air pipe 21 and falls on the baffle 8, realizing the power transfer of the wide-range paddle 46 and the air pipe 21. The motor 61 reduces the rotating speed to 80 r / min, and the air pipe 21 drives the wide-range paddle 46 to rotate at 40 r / min; the wide-range paddle 46 pushes the slurry to form a horizontal circulating flow and a slight up-down disturbance, which not only maintains the suspended state of the crystal, but also avoids destroying the shaped calcite crystal by strong shearing. At the same time, the ultrasonic dispersion assembly 7 enters the stable mode, the amplitude rod 72 generates micro-vibration to prevent the secondary agglomeration of the bottom crystal due to gravity deposition, and the steam pressure of the air pipe 21 is reduced to below 0.1 MPa. A small amount of steam is used to supplement heat loss, the slurry temperature is maintained at 50±1℃, the crystal surface free water is removed, and the agglomeration risk is reduced in the subsequent drying link. Through the mild circulation in the early stage, the strengthened shearing in the middle stage, and the stable flow field in the later stage, the material characteristics in different aging stages are adapted.

[0040] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An aging device for processing nano-calcium carbonate, comprising an aging tank (1), characterized in that, Also includes: The initial aging component (2) is set on the aging tank (1) and is used to play a mild circulation role in the initial aging of nano-calcium carbonate to maintain the integrity of the crystals. The initial aging component (2) includes an empty tube (21), which is rotatably connected to the aging tank (1). A transmission gear (22) is connected to the empty tube (21). A hollow sleeve (23) is connected inside the hollow aging tank (1). The hollow sleeve (23) is located outside the empty tube (21). A spiral blade (24) that cooperates with the hollow sleeve (23) is connected to the empty tube (21). The mid-term aging component (3) is set inside the aging tank (1) and plays a role in enhancing dispersion during the mid-term aging of the slurry; The post-aging component (4) is set outside the empty tube (21) to maintain a stable flow field during post-aging; The corner scraping component (5) is installed inside the aging tank (1) and is used to scrape and clean the slurry remaining in the corner of the aging tank (1); A control component (6) is installed on the aging tank (1) to provide power to the initial aging component (2) and the intermediate aging component (3).

2. The aging equipment for processing nano-calcium carbonate according to claim 1, characterized in that: The mid-term aging component (3) includes a support tube (31), which is located inside the aging tank (1). A slanted blade (32) is fixedly installed on the surface of the support tube (31). A connecting gear (33) is connected to the support tube (31). A connecting rod (34) is rotatably connected to the support tube (31). The connection between the connecting rod (34) and the connecting gear (33) is rotatably connected by a ball bearing. The top of the aging tank (1) controls the raising and lowering of the support tube (31) through an up-and-down control component (35).

3. The aging equipment for processing nano-calcium carbonate according to claim 2, characterized in that: The upper and lower control components (35) include a support plate (351), which is fixedly installed on the top of the aging tank (1). An electric cylinder (352) is fixedly installed at the bottom of the support plate (351), and a pulling plate (353) is fixedly installed at the telescopic end of the electric cylinder (352). The bottom of the pulling plate (353) is fixedly installed with the top of the connecting rod (34).

4. The aging equipment for processing nano-calcium carbonate according to claim 2, characterized in that: The post-aging component (4) includes a support sleeve (41), which is fitted over the empty tube (21). A linkage plate (42) is fitted onto the connecting gear (33). The top of the linkage plate (42) is rotatably connected to the bottom of the support sleeve (41) via ball bearings. A clamping plate (43) is connected to the support sleeve (41). A block (44) is connected to the empty tube (21). A square opening (45) adapted to the block (44) is provided on the clamping plate (43). A wide-range blade (46) is connected to the clamping plate (43).

5. An aging device for processing nano-calcium carbonate according to claim 2, characterized in that: The corner scraping assembly (5) includes a rotating gear ring (51), which is rotatably connected to the inside of the aging tank (1). The outer surface of the connecting gear (33) is adapted to the inner ring of the rotating gear ring (51). A scraping support plate (52) is connected to the bottom of the rotating gear ring (51), and a scraping strip (53) is connected to the scraping support plate (52). The scraping strip (53) is attached to the inner wall of the aging tank (1).

6. The aging equipment for processing nano-calcium carbonate according to claim 5, characterized in that: The control component (6) includes a motor (61), which is mounted on the aging tank (1) via a mounting plate. The outer surface of the output shaft of the motor (61) is connected to a drive gear (62), which meshes with a transmission gear (22). The surface of the output shaft of the motor (61) is connected to a drive gear (63) located inside the aging tank (1), and the outer surface of the drive gear (63) meshes with the inner ring of a rotating gear ring (51).

7. The aging equipment for processing nano-calcium carbonate according to claim 1, characterized in that: The bottom of the transmission gear (22) is rotatably connected to the aging tank (1) via ball bearings to support the rotation of the empty tube (21).

8. The aging equipment for processing nano-calcium carbonate according to claim 1, characterized in that: An ultrasonic dispersion component (7) is also fixedly installed at the bottom of the aging tank (1). The ultrasonic dispersion component (7) includes an ultrasonic nano-disperser (71). The ultrasonic nano-disperser (71) is fixedly installed at the bottom of the aging tank (1). An amplitude transformer (72) is fixedly installed at the bottom of the aging tank (1). The amplitude transformer (72) is inserted into the interior of the aging tank (1).

9. An aging device for processing nano-calcium carbonate according to claim 4, characterized in that: A baffle (8) is connected to the empty tube (21), and the baffle (8) is located at the bottom of the block (44).

10. An aging device for processing nano-calcium carbonate according to claim 1, characterized in that: The interior of the hollow tube (21) is hollow, and the heating steam is injected into the aging tank (1) through the holes on its surface to heat the slurry in the aging process and raise its temperature rapidly.

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