Dry surface modification system for ultrafine calcium carbonate powder
Through the dry surface modification system, including high-speed mixing, slow stirring, depolymerization and grading steps, the agglomeration problems of calcium carbonate ultrafine powders in the modification process are solved, and products with high activation and good dispersion are prepared, which improves their application performance.
Patent Information
- Application Number
- CN202421474182.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-06-26
AI Technical Summary
The existing calcium carbonate drying equipment fails to effectively solve the agglomeration phenomenon of ultrafine calcium carbonate powder during the surface modification process, resulting in the agglomeration problem of modified products.
The dry surface modification system is adopted, including a high-speed mixing system, a slow stir modification system, a depolymerization system and a grading system. The surface activation reaction is completed by mixing and mixing dispersants at high speed, and the surface activation reaction is completed by slow stirring. The depolymerization system depolymerizes the aggregates, and is graded through a cyclone separator and a bag dust removal device to obtain calcium carbonate powder products with high activation and good dispersion.
The surface modification-depolymerization-grading continuous operation of calcium carbonate ultrafine powder was achieved, and the calcium carbonate ultrafine powder product with high activation degree and good dispersion was prepared, which solved the agglomeration problem and improved the application performance of the product.
Smart Images
Figure CN222956386U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a surface modification system for powder materials, and more specifically to a dry surface modification system for ultra-fine calcium carbonate powder. Background Art
[0002] Calcium carbonate powder is an important inorganic chemical product. With its excellent and unique physical and chemical properties, wide sources, and low price, it has developed into the most widely used and largest-consumed inorganic non-metallic mineral powder material, occupying a very important position in China's industrial system and being widely used in fields such as rubber and plastics, papermaking, coatings, building materials, and daily chemicals.
[0003] Surface modification is an important means necessary to improve the application performance and applicability of calcium carbonate. This is because on the one hand, ultra-fine refinement is an important way to improve the quality of calcium carbonate. However, the smaller the particle size of calcium carbonate, the higher the surface energy, the stronger the adsorption effect, and the more serious the agglomeration phenomenon. Through surface modification, the modifier can be adsorbed on the surface of calcium carbonate directionally, enhancing the repulsive energy between calcium carbonate particles, making calcium carbonate less likely to agglomerate, and thus achieving good dispersion in the matrix. On the other hand, through surface modification, the interfacial compatibility and affinity between calcium carbonate and organic substances can be increased, thereby improving the product performance of composite materials such as rubber or plastic.
[0004] Currently, the surface modification processes applied in industry mainly include dry process and wet process. The wet process mainly disperses calcium carbonate powder in water, modifies the surface of the powder in the aqueous dispersion system, and then dehydrates and dries the slurry. The dry process directly modifies the surface of the dried powder. The process is relatively simple, the preparation time is short, and it is more suitable for the surface modification of dried ultra-fine calcium carbonate powder. However, the current calcium carbonate dry drying equipment generally operates intermittently and does not consider that a certain degree of agglomeration has occurred in ultra-fine calcium carbonate, and there are agglomerates. The modified calcium carbonate product still has an agglomeration phenomenon. Summary of the Utility Model
[0005] In view of the above problems, the utility model proposes a dry surface modification system for ultra-fine calcium carbonate powder. The dispersant and ultra-fine calcium carbonate powder are uniformly mixed by a high-speed mixing system, and further, the surface modification is completed by the surface activation reaction between the dispersant and calcium carbonate in a slow mixing and modification system. In view of the situation where the particles still have agglomeration, a depolymerization system is used to depolymerize the calcium carbonate aggregates. Finally, a cyclone separator and a bag dust removal device are used to classify the calcium carbonate powder, obtaining two kinds of particle size modified calcium carbonate powder products, which can realize the continuous operation of surface modification - depolymerization - classification of ultra-fine calcium carbonate powder, and prepare calcium carbonate ultra-fine powder products with high activation degree and good dispersion.
[0006] The main technical solution is as follows: A dry surface modification system for ultra-fine calcium carbonate powder; it includes a feeding system A, a high-speed mixing system B, a slow stirring modification system C, a depolymerization system D, and a classification system E; the feeding system A, the high-speed mixing system B, the slow stirring modification system C, the depolymerization system D, and the classification system E are connected in sequence.
[0007] Furthermore; the feeding system A includes a feeding trough and a lifting and conveying auger; the feeding trough is located at the bottom of the lifting and conveying auger.
[0008] Furthermore; the high-speed mixing system B includes a high-speed mixer, a high-speed mixing motor, mixing stirring rod blades, a modifier storage tank, and a modifier dosing pump; the calcium carbonate powder is conveyed from the feeding trough into the high-speed mixer through the lifting and conveying auger; the modifier storage tank is connected to the high-speed mixer through the modifier dosing pump, and mixing stirring rod blades are arranged inside the high-speed mixer, and the mixing stirring rod blades are driven by the high-speed mixing motor outside.
[0009] Furthermore; the slow stirring modification system C includes a horizontal stirring mixer, spiral ribbon stirring blades, a slow stirring motor, and a star feeder A; the horizontal stirring mixer is connected to the high-speed mixer of the high-speed mixing system B through an auger; spiral ribbon stirring blades driven by the slow stirring motor are arranged in the horizontal stirring mixer, and a star feeder A is arranged at the bottom of the horizontal stirring mixer.
[0010] Furthermore; the depolymerization system D includes a conveying auger, an impact mill, an impact mill motor, an impact impeller, and a crushing chamber; the impact mill is connected to the horizontal stirring mixer of the slow stirring modification system C through a conveying auger; an impact impeller driven by the impact mill motor is arranged in the impact mill.
[0011] Furthermore; the classification system E includes a cyclone separator, a star feeder B, a bag dust collector, a separation bag, a draft fan, and a finished product conveying auger; the cyclone separator is connected to the impact mill of the depolymerization system D through an air duct, and the cyclone separator, the bag dust collector, and the draft fan are all connected through air ducts; a star feeder B is arranged at the lower end of the cyclone separator, and the star feeder B is connected to the finished product conveying auger.
[0012] Furthermore, the operation process of this application is as follows: The ultrafine calcium carbonate powder is first mechanically conveyed into the feed tank, and then conveyed into the high-speed mixer of the high-speed mixing system B through the lifting conveyor auger; the dispersion modifier is stored in the modifier storage tank and pumped into the high-speed mixer through the modifier dosing pump; the high-speed mixing motor drives the mixing stirring rod blades to stir at high speed, so that the ultrafine calcium carbonate powder and the dispersion modifier are evenly mixed, and the dispersant is evenly distributed on the surface of the ultrafine calcium carbonate powder; further, the mixed calcium carbonate material is conveyed into the horizontal stirring mixer of the slow stirring modification system C through the auger, and the slow stirring motor drives the spiral ribbon stirring blades to stir, so that the modifier reacts and combines on the surface of the calcium carbonate to complete the surface modification of the calcium carbonate; the modified ultrafine calcium carbonate powder enters the conveyor auger through the star feeder and is conveyed into the impact mill of the depolymerization system D through the conveyor auger; in the impact mill, the impact mill motor drives the impact impeller to rotate at high speed, so that the aggregates in the ultrafine calcium carbonate powder are depolymerized in the crushing chamber; the depolymerized and dispersed ultrafine calcium carbonate powder is introduced into the cyclone separator of the classification system E through the air duct, and the calcium carbonate powder with relatively large particle size is collected in the cyclone separator and enters the finished product conveyor auger through the star feeder and is conveyed to the finished product bin; the calcium carbonate powder with relatively large particle size enters the bag dust collector from the upper part of the cyclone separator through the air duct, is separated and collected by the separation bag and enters the bottom of the bag dust collector, and is conveyed to the finished product bin through the finished product conveyor auger; the induced draft fan forms a negative pressure by suction to convey and classify the calcium carbonate powder in the classification system E.
[0013] The beneficial effects of the present utility model: The present utility model first uses the high-speed mixing system to evenly mix the dispersant with the ultrafine calcium carbonate powder, and further makes the dispersant react with the surface of the calcium carbonate to complete the surface modification in the slow mixing modification system. In view of the situation that there are still agglomerates in the particles, the depolymerization system is used to depolymerize the calcium carbonate aggregates. Finally, the cyclone separator and the bag dust removal device are used to classify the calcium carbonate powder, and two kinds of modified calcium carbonate powder products with different particle sizes are obtained. The continuous operation of surface modification - depolymerization - classification of the ultrafine calcium carbonate powder can be realized, and an ultrafine calcium carbonate powder product with high activation degree and good dispersibility can be prepared. Description of the Drawings
[0014] Figure 1 It is a structural schematic diagram of a dry surface modification system for an ultrafine calcium carbonate powder of the present utility model;
[0015] Wherein: A is the feeding system, B is the high-speed mixing system, C is the slow stirring modification system, D is the depolymerization system, and E is the classification system; 1. Feeding tank, 2. Elevating and conveying auger, 3. High-speed mixer, 4. High-speed mixing motor, 5. Mixing and stirring rod blades, 6. Modifier storage tank, 7. Modifier dosing pump, 8. Horizontal stirring mixer, 9. Ribbon stirring blades, 10. Slow stirring motor, 11. Star feeder A, 12. Conveying auger, 13. Impact mill, 14. Impact mill motor, 15. Impact impeller, 16. Crushing chamber, 17. Cyclone separator, 18. Star feeder B, 19. Bag dust collector, 20. Separation bag, 21. Induced draft fan, 22. Finished product conveying auger. Detailed implementation mode
[0016] The present utility model will be further described in detail below in conjunction with the specific implementation mode.
[0017] As Figure 1 shown; The present application provides a dry surface modification system for ultra-fine calcium carbonate powder, which can be implemented in the following manner; including a feeding system A, a high-speed mixing system B, a slow stirring modification system C, a depolymerization system D, and a classification system E.
[0018] The feeding system A includes a feeding tank 1 and an elevating and conveying auger 2; The high-speed mixing system B includes a high-speed mixer 3, a high-speed mixing motor 4, mixing and stirring rod blades 5, a modifier storage tank 6, and a modifier dosing pump 7; The calcium carbonate powder is conveyed from the feeding tank 1 into the high-speed mixer 3 through the elevating and conveying auger 2.
[0019] The slow stirring modification system C includes a horizontal stirring mixer 8, ribbon stirring blades 9, a slow stirring motor 10, and a star feeder A 11; The high-speed mixer 3 of the high-speed mixing system B is connected to the horizontal stirring mixer 8 through an auger.
[0020] The depolymerization system D includes a conveying auger 12, an impact mill 13, an impact mill motor 14, an impact impeller 15, and a crushing chamber 16; The horizontal stirring mixer 8 of the slow stirring modification system C is connected to the impact mill 13 through the conveying auger 12; The classification system E includes a cyclone separator 17, a star feeder 18, a bag dust collector 19, a separation bag 20, an induced draft fan 21, and a finished product conveying auger 22; The impact mill 13 of the depolymerization system D is connected to the cyclone separator 17 through an air duct, and the cyclone separator 17, the bag dust collector 19, and the induced draft fan 21 are all connected through air ducts.
[0021] The working process of the present utility model is as follows: The ultrafine calcium carbonate powder is first mechanically conveyed into the feed trough 1, and then conveyed into the high-speed mixer 3 of the high-speed mixing system B through the lifting and conveying auger 2; the dispersion modifier is stored in the modifier storage tank 6 and pumped into the high-speed mixer 3 through the modifier dosing pump 7; the high-speed mixing motor 4 drives the mixing stirring rod blades 5 to perform high-speed stirring, so that the ultrafine calcium carbonate powder and the dispersion modifier are evenly mixed, and the dispersant is evenly distributed on the surface of the ultrafine calcium carbonate powder; further, the mixed calcium carbonate material is conveyed into the horizontal stirring mixer 8 of the slow stirring modification system C through the auger, and the slow stirring motor 10 drives the spiral ribbon stirring blades 9 to stir, so that the modifier reacts and combines on the surface of the calcium carbonate to complete the surface modification of the calcium carbonate; the modified ultrafine calcium carbonate powder enters the conveying auger 12 through the star-shaped feeder A11 and is conveyed into the impact mill 13 of the depolymerization system D through the conveying auger 12; in the impact mill 13, the impact mill motor 14 drives the impact impeller 15 to rotate at a high speed, so that the aggregates in the ultrafine calcium carbonate powder are depolymerized in the crushing chamber 16; the depolymerized and dispersed ultrafine calcium carbonate powder is introduced into the cyclone separator 17 of the classification system E through the air duct, and the calcium carbonate powder with a relatively large particle size is collected in the cyclone separator 17 and enters the finished product conveying auger 22 through the star-shaped feeder B18 and is conveyed to the finished product bin; the calcium carbonate powder with a relatively large particle size enters the bag dust collector 19 from the upper part of the cyclone separator 17 through the air duct, is separated and collected by the separating bag 20 and enters the bottom of the bag dust collector 19, and is conveyed to the finished product bin through the finished product conveying auger 22; the induced draft fan 21 forms a negative pressure by suction to convey and classify the calcium carbonate powder in the classification system E.
[0022] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A dry surface modification system for ultrafine calcium carbonate powder, characterized in that; It includes a feeding system A, a high-speed mixing system B, a slow stirring modification system C, a depolymerization system D, and a classification system E; the feeding system A, the high-speed mixing system B, the slow stirring modification system C, the depolymerization system D, and the classification system E are connected in sequence.
2. A dry surface modification system for ultrafine calcium carbonate powder according to claim 1, characterized in that: The feeding system A comprises a feeding trough (1) and a lifting and conveying auger (2); the feeding trough (1) is located at the bottom of the lifting and conveying auger (2).
3. A dry surface modification system for ultrafine calcium carbonate powder according to claim 1, characterized in that: The high-speed mixing system B comprises a high-speed mixer (3), a high-speed mixing motor (4), a mixing and stirring blade (5), a modifier storage tank (6), and a modifier dosing pump (7); calcium carbonate powder is transported from a feed tank (1) into the high-speed mixer (3) through a lifting and conveying auger (2); the modifier storage tank (6) is connected to the high-speed mixer (3) through the modifier dosing pump (7); a mixing and stirring blade (5) is arranged inside the high-speed mixer (3), and the mixing and stirring blade (5) is driven by an external high-speed mixing motor (4).
4. The dry surface modification system of ultrafine calcium carbonate powder according to claim 1, characterized in that: The slow stirring modification system C comprises a horizontal stirring mixer (8), a spiral stirring blade (9), a slow stirring motor (10), and a star-shaped feeder A (11); the horizontal stirring mixer (8) is connected to the high-speed mixer (3) of the high-speed mixing system B via an auger; the horizontal stirring mixer (8) is provided with a spiral stirring blade (9) driven by the slow stirring motor (10), and the star-shaped feeder A (11) is arranged at the bottom of the horizontal stirring mixer (8).
5. The dry surface modification system of ultrafine calcium carbonate powder according to claim 1, characterized in that: The depolymerization system D comprises a conveying auger (12), an impact mill (13), an impact mill motor (14), an impact impeller (15), and a crushing chamber (16); the impact mill (13) is connected to a horizontal stirring mixer (8) of a slow stirring modification system C via the conveying auger (12); and the impact mill (13) has an impact impeller (15) driven by the impact mill motor (14).
6. The dry surface modification system of ultrafine calcium carbonate powder according to claim 1, characterized in that: The classification system E comprises a cyclone separator (17), a star-shaped feeder B (18), a bag dust collector (19), a separation bag (20), an induced draft fan (21), and a finished product conveying auger (22); the cyclone separator (17) is connected to the impact mill (13) of the deagglomeration system D through an air duct, and the cyclone separator (17), the bag dust collector (19), and the induced draft fan (21) are all connected through the air duct; a star-shaped feeder B (18) is arranged at the lower end of the cyclone separator (17), and the star-shaped feeder B (18) is connected to the finished product conveying auger (22).