A wet ball milling carbonization system using microbubbles

Abstract

The present application belongs to the field of energy saving and environmental protection technology, and discloses a wet ball milling carbonization system using micro-bubbles, which comprises a vertical ball mill and a carbon dioxide source, and further comprises a micro-bubble generator, a slurry circulating pump and a slurry circulating pipe; the cylinder of the vertical ball mill is internally provided with grinding balls for wet ball milling of solid waste; the micro-bubble generator is installed at the bottom of the cylinder; the outlet of the micro-bubble generator is in communication with the cylinder; the liquid inlet of the micro-bubble generator is connected to the liquid circulating outlet on the cylinder through the slurry circulating pipe; the slurry circulating pump is arranged on the slurry circulating pipe; and the carbon dioxide source is connected to the gas inlet of the micro-bubble generator through a gas pipe. The present application adds micro-bubbles of carbon dioxide during ball milling, and the micro-bubbles can effectively accelerate the dissolution of carbon dioxide, thereby accelerating the generation of carbonate ions and the carbonization reaction with the surface of solid waste.

Description

Technical Field

[0001] The invention belongs to the technical field of energy conservation and environmental protection, and particularly relates to a wet ball milling carbonization system utilizing microbubbles. Background Art

[0002] If bulk solid wastes such as steel slag and waste concrete are directly added to concrete, they will have a negative impact on the performance of concrete. However, these bulk solid wastes rich in calcium and magnesium can absorb carbon dioxide when in contact with carbon dioxide in a moist state and convert into corresponding solid carbonate minerals. Among them, solid wastes such as steel slag can reduce the content of free calcium oxide and magnesium oxide after carbonization, avoiding affecting the stability of cement concrete; waste concrete can generate calcium carbonate and silica gel in its own pores after carbonization, thereby playing a reinforcing role. Therefore, the introduction of carbon dioxide into the above-mentioned bulk solid wastes in a moist state can achieve carbonization of the solid wastes, which not only reduces carbon dioxide emissions, but also facilitates the use of solid wastes as concrete raw materials, reducing the negative impact on concrete performance.

[0003] In the existing technology, in order to increase the efficiency of the carbonization reaction and prepare for subsequent resource utilization, solid waste is generally crushed and ground into smaller particles before carbonization. One way is to add solid waste particles of a certain particle size into a ball mill, perform wet ball milling, and introduce carbon dioxide. Compared with carbonization after grinding, on the one hand, grinding and carbonization can be carried out at the same time, and on the other hand, the grinding process can destroy the carbonized layer formed on the surface of the solid waste during carbonization, and can keep the uncarbonized part of the solid waste in contact with carbon dioxide, thereby increasing the carbonization rate and allowing the solid waste to be fully carbonized. However, this type of existing technology still has the following defects: wet ball milling has very high requirements for the fluidity of the slurry, and a large amount of liquid needs to be added. The contact area between the directly introduced carbon dioxide and the liquid is small, and the amount of carbon dioxide dissolved is small. It is difficult to directly contact the solid waste, which reduces the reaction efficiency. To this end, existing technologies often use pressurized carbon dioxide injection to increase the amount of carbon dioxide dissolved and the reaction efficiency. However, on the one hand, this requires the use of a booster device, which increases energy consumption and also places higher high-pressure resistance requirements on containers and pipelines. On the other hand, this method has limited effects on improving the carbon dioxide dissolution rate and carbonization reaction efficiency, and the carbonization reaction efficiency still needs to be further improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a wet ball mill carbonization system using fine bubbles to solve the technical problems of slow dissolution rate, low dissolution amount, low carbonization reaction degree and long duration of carbonization in the prior art.

[0005] The wet ball milling carbonization system using microbubbles includes a vertical ball mill and a carbon dioxide gas source, as well as a microbubble generator, a slurry circulation pump and a slurry circulation pipe. The cylinder of the vertical ball mill has built-in grinding balls for wet ball milling of solid waste. The microbubble generator is installed at the bottom of the cylinder, and the outlet of the microbubble generator is connected to the cylinder. The liquid inlet of the microbubble generator is connected to the liquid circulation outlet on the cylinder through the slurry circulation pipe. The slurry circulation pump is provided on the slurry circulation pipe, and the carbon dioxide gas source is connected to the gas inlet of the microbubble generator through an air pipe.

[0006] Preferably, the vertical ball mill includes the barrel, a stirring mechanism, a stirring motor and a barrel cover, the stirring motor is installed on the barrel cover, and the barrel cover is installed on the top opening of the barrel, the stirring mechanism is located in the barrel and is connected to the output shaft of the stirring motor, and a liquid inlet structure is provided in the bottom of the barrel, the upper part of the liquid inlet structure is a plurality of liquid inlet grooves connected to the grinding chamber in the barrel, and the lower part of the liquid inlet structure is a liquid inlet connected to the outlet of the micro-bubble generator.

[0007] Preferably, the liquid inlet structure also includes a liquid inlet cavity in the bottom of the cylinder, the shape and size of the top of the liquid inlet cavity are adapted to the shape and size of the bottom of the grinding cavity, the liquid inlet grooves are evenly distributed at the bottom of the grinding cavity and connected to the top of the liquid inlet cavity, and the liquid inlet is located at the bottom center of the liquid inlet cavity.

[0008] Preferably, a plurality of wear-resistant plates are fixedly mounted on the bottom of the cylinder, gaps are left between the wear-resistant plates, and the liquid inlet grooves are all located below the gaps between the wear-resistant plates.

[0009] Preferably, the micro-bubble generator includes a generator housing, a generator motor installed at the bottom of the generator housing, a bubble crushing mechanism and the outlet. The outlet of the micro-bubble generator is a Venturi tube structure, and the opening diameter at the top of the outlet is larger than the diameter of the throat part located in the middle of the outlet, and the diameter of the throat part is smaller than the diameter of the bottom of the outlet.

[0010] Preferably, a one-way valve is provided at the opening at the top of the outlet to prevent the slurry from flowing back, and the outlet of the micro-bubble generator is connected to the bottom of the cylinder through a sealed rotary joint.

[0011] Preferably, a horizontal partition is fixed in the generator housing, and the horizontal partition divides the inner cavity of the generator housing into an upper bubble crushing chamber and a lower liquid storage chamber. The bubble crushing mechanism includes a central rotating shaft and a bubble shearing blade installed on the central rotating shaft. The central rotating shaft is vertically installed in the center of the inner cavity of the generator housing, and the lower part of the central rotating shaft passes through the central through hole of the horizontal partition and is connected to the output shaft of the generator motor. The bubble shearing blade is installed on the part of the central rotating shaft above the horizontal partition. The radius of the central through hole is smaller than the radial extension length of the bubble shearing blade. The liquid storage chamber is connected to the liquid inlet, and the gas inlet is provided on the side of the liquid inlet.

[0012] Preferably, the wet ball milling carbonization system also includes a cyclone separator and a concentrated slurry recovery tank, the slurry circulation pipe is divided into a first circulation pipe and a second circulation pipe, the first circulation pipe connects the liquid circulation outlet and the inlet of the cyclone separator, the slurry circulation pump is arranged on the first circulation pipe, the second circulation pipe connects the thin slurry outlet of the cyclone separator and the liquid inlet of the micro-bubble generator, and the concentrated slurry outlet at the lower end of the cyclone separator is connected to the concentrated slurry recovery tank.

[0013] Preferably, the concentrated slurry recovery tank is connected to the solid waste inlet on the cylinder cover through a solid waste return pipe, and the solid waste return pipe is provided with a concentrated slurry delivery pump.

[0014] Preferably, the carbon dioxide gas source is a gas tank, the cylinder cover is provided with a gas outlet connected to the upper part of the cylinder body, the gas outlet is connected to the gas inlet of the gas tank through a gas circulation pipe, and the gas circulation pipe is provided with a pressure pump.

[0015] The present invention has the following advantages: It provides a wet ball mill carbonization system that circulates slurry through a slurry circulation pipe. Dilute slurry and carbon dioxide are both transported to a micro-bubble generator for mixing, and the carbon dioxide bubbles are broken up. Under intense agitation, the dilute slurry and carbon dioxide undergo a preliminary carbonation reaction, producing fine micro-nanoscale light calcium carbonate particles. This light calcium carbonate can effectively improve various properties of concrete. Uncompletely dissolved carbon dioxide microbubbles form a slurry uniformly mixed with carbon dioxide microbubbles, which is then fed back into the ball mill. This introduces carbon dioxide microbubbles into the slurry within the cylinder during the wet ball milling process. These microbubbles effectively accelerate the dissolution of carbon dioxide, thereby accelerating the formation of carbonate ions and their carbonization reaction with the solid waste surface.

[0016] In this solution, the slurry mixed with fine bubbles is evenly filled into the cylinder from the bottom of the cylinder. During the filling process, the stirring action of the grinding balls and the buoyancy of the fine bubbles themselves combine to cause the fine bubbles to produce a violent stirring and shearing effect on the slurry, thereby preventing the accumulation and coating of carbonization products on the surface of solid waste particles such as steel slag during the carbonization process. Under the combined action of the stirring impact of the fine bubbles and wet grinding, the calcium carbonate crystals as carbonization products are continuously broken, making it difficult for them to continue to grow on the surface of the solid waste particles. Therefore, the particle fineness of the carbonization products can be increased, and the relevant properties of the concrete using such products are improved. Finally, from the perspective of carbon dioxide absorption, the floating speed of fine bubbles is lower than that of large bubbles. Therefore, after introducing fine bubbles from the bottom of the cylinder, this solution can also reduce the floating speed of carbon dioxide in the slurry, which is conducive to the full contact between solid waste and uncarbonized substances in the slurry and carbon dioxide. By increasing the contact time, the carbon absorption effect is improved, and carbon dioxide is captured as much as possible, thereby improving the carbon capture efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a wet ball milling carbonization system utilizing microbubbles according to the present invention.

[0018] Figure 2 for Figure 1 The structure shown is a schematic diagram of the structure of a vertical ball mill and a fine bubble generator.

[0019] Figure 3 for Figure 2 Magnified view of region A in the shown structure.

[0020] The reference numerals in the accompanying drawings include: 1. carbon dioxide gas source, 2. vertical ball mill, 21. cylinder, 211. liquid circulation outlet, 212. liquid inlet tank, 22. stirring motor, 23. stirring mechanism, 24. grinding ball, 25. wear-resistant plate, 26. cylinder cover, 261. gas outlet, 262. solid waste inlet, 27. frame, 28. liquid inlet chamber, 3. micro bubble generator, 31. generator housing, 32. bubble crushing mechanism, 33. generator motor, 34. liquid storage chamber, 35. liquid inlet, 36. gas inlet, 37. one-way valve, 38. throat part, 39. rotary joint, 4. cyclone separator, 5. concentrated slurry recovery box, 6. slurry circulation pump, 7. pressure pump, 8. slurry circulation pipe, 9. concentrated slurry delivery pump. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the specific implementation methods of the present invention through the description of the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0022] like Figure 1-Figure 3As shown, the present invention provides a wet ball milling carbonization system utilizing microbubbles, comprising a vertical ball mill 2, a carbon dioxide gas source 1, a microbubble generator 3, a slurry circulation pump 6, and a slurry circulation pipe 8. The barrel 21 of the vertical ball mill 2 houses grinding balls 24 for wet ball milling solid waste. The microbubble generator 3 is mounted at the bottom of the barrel 21, and the outlet of the microbubble generator 3 is connected to the interior of the barrel 21. The liquid inlet 35 of the microbubble generator 3 is connected to the liquid circulation outlet 211 on the barrel 21 via the slurry circulation pipe 8. The slurry circulation pump 6 is disposed on the slurry circulation pipe 8 to provide circulation power. The carbon dioxide gas source 1 is connected to the gas inlet 36 of the microbubble generator 3 via a gas pipe. This solution enables slurry uniformly mixed with carbon dioxide microbubbles to be replenished back into the ball mill, thereby introducing microbubbles of carbon dioxide into the slurry in the barrel 21 during the wet ball milling process. Compared with ventilation and pressurization from the liquid surface and direct inflation into the slurry, the carbon dioxide forming fine bubbles is more evenly distributed in the slurry and dissolves faster, effectively increasing the rate of the carbonization reaction.

[0023] The vertical ball mill 2 includes the barrel 21, a stirring mechanism 23, a stirring motor 22 and a barrel cover 26. The stirring motor 22 is installed on the barrel cover 26, and the barrel cover 26 is installed on the top opening of the barrel 21. The stirring mechanism 23 is located in the barrel 21 and is connected to the output shaft of the stirring motor 22. A liquid inlet structure is provided in the bottom of the barrel 21. The upper part of the liquid inlet structure is a plurality of liquid inlet grooves 212 connected to the grinding chamber in the barrel 21. The lower part of the liquid inlet structure is a liquid inlet connected to the outlet of the micro-bubble generator 3. This structure utilizes a stirring mechanism 23 to drive the grinding balls 24 to achieve ball milling, and the liquid used for wet ball milling circulates through the slurry circulation pipe 8, and then introduces carbon dioxide bubbles through the fine bubble generator 3 and then fills into the grinding chamber from the bottom of the cylinder 21, thereby achieving the goal of directly filling the fine bubbles from the bottom, quickly entering and contacting the solid waste particles and the grinding medium, so that the carbonization reaction can be further improved, and the fine bubbles floating from the bottom can contact as many solid waste particles as possible above, so the carbon dioxide absorption rate is better than other existing technologies.

[0024] The liquid inlet structure also includes a liquid inlet chamber 28 within the bottom of the cylinder. The shape and size of the top of the liquid inlet chamber 28 match those of the bottom of the grinding chamber. The liquid inlet grooves 212 are evenly distributed at the bottom of the grinding chamber and communicate with the top of the liquid inlet chamber 28. The liquid inlet is located at the bottom center of the liquid inlet chamber 28. This structure allows the slurry mixed with fine bubbles to first fill the liquid inlet chamber 28 and then flow into the grinding chamber through the evenly distributed liquid inlet grooves 212. This allows the slurry and fine bubbles to be relatively evenly filled into the grinding chamber, uniformly improving the reaction efficiency of solid waste particles in all areas of the grinding chamber.

[0025] A number of wear-resistant plates 25 are fixedly mounted on the bottom of the cylinder, with gaps between the wear-resistant plates 25, and the liquid inlet grooves 212 are all located below the gaps between the wear-resistant plates 25. The wear-resistant plates 25 can prevent the bottom of the cylinder and the liquid inlet grooves 212 from being worn by the grinding balls 24. The service life of the cylinder 21 and the system is extended. The position of the liquid circulation outlet 211 is lower than the slurry liquid level in the grinding chamber. The vertical ball mill 2 also includes a frame 27, and the cylinder 21 is mounted on the table of the frame 27. A through hole corresponding to the center of the cylinder 21 is provided on the table, and the outlet of the micro-bubble generator 3 is connected to the bottom center of the cylinder 21 through the through hole.

[0026] The micro-bubble generator 3 includes a generator housing 31, a generator motor 33 installed at the bottom of the generator housing 31, a bubble crushing mechanism 32 and the outlet. A horizontal partition is fixed in the generator housing 31, and the horizontal partition divides the inner cavity of the generator housing 31 into an upper bubble crushing chamber and a lower liquid storage chamber 34. The bubble crushing mechanism 32 includes a central rotating shaft and a bubble shearing blade installed on the central rotating shaft. The central rotating shaft is vertically installed in the center of the inner cavity of the generator housing 31, and the lower part of the central rotating shaft passes through the central through hole of the horizontal partition and is connected to the output shaft of the generator motor 33. The bubble shearing blade is installed on the part of the central rotating shaft above the horizontal partition. The radius of the central through hole is smaller than the radial extension length of the bubble shearing blade. The liquid storage chamber 34 is connected to the liquid inlet 35, and the gas inlet 36 is provided on the side of the liquid inlet 35. In this way, carbon dioxide gas is introduced into the slurry entering through the liquid inlet 35. The slurry mixed with carbon dioxide bubbles is then introduced into the liquid storage chamber 34. The slurry then flows through the central through-hole (equivalent to a throat, which has a certain bubble breaking effect) into the bubble breaking chamber. The carbon dioxide bubbles are then broken into microscopic bubbles by the bubble shear blades. During this process, the dilute slurry contains relatively few solid waste particles. The calcium ions dissolved in the dilute slurry react with the carbon dioxide, initially nucleating and growing into fine micro-nano calcium carbonate particles in the liquid phase.

[0027] The outlet of the micro-bubble generator 3 is a Venturi tube structure. The diameter of the opening at the top of the outlet is larger than the diameter of the throat portion 38 located in the middle of the outlet, and the diameter of the throat portion 38 is smaller than the diameter of the bottom of the outlet. In this way, when the slurry passes through the outlet, the micro-bubbles will further break into smaller micro-bubbles at the throat portion 38 as the flow rate increases, and diffuse outward from the opening at the top. To prevent the slurry from flowing back from the outlet of the micro-bubble generator 3, a one-way valve 37 is provided at the opening at the top of the outlet to prevent the slurry from flowing back. In order to facilitate the adjustment and installation of the micro-bubble generator 3 and prevent liquid leakage, the outlet of the micro-bubble generator 3 is connected to the bottom of the cylinder via a sealed rotary joint 39.

[0028] The wet ball mill carbonization system also includes a cyclone separator 4 and a concentrated slurry recovery tank 5. The slurry circulation pipe 8 is divided into a first circulation pipe and a second circulation pipe. The first circulation pipe connects the liquid circulation outlet 211 and the inlet of the cyclone separator 4. The slurry circulation pump 6 is provided on the first circulation pipe. The second circulation pipe connects the dilute slurry outlet of the cyclone separator 4 and the liquid inlet 35 of the micro-bubble generator 3. The concentrated slurry outlet at the lower end of the cyclone separator 4 is connected to the concentrated slurry recovery tank 5. In this way, most of the solid waste particles in the slurry flowing out of the grinding chamber are separated into the concentrated slurry recovery tank 5, while the slurry input into the micro-bubble generator 3 is a dilute slurry with a low solid waste particle content. Therefore, the bubble breaking mechanism 32 in the micro-bubble generator 3 collides less with the solid waste particles, extending the service life of the equipment. At the same time, the slurry in the liquid inlet structure has a low solid waste content and is less likely to cause clogging of the liquid inlet tank 212. Therefore, the service life of the entire system is extended and the maintenance frequency and cost are reduced.

[0029] The concentrated slurry recovery tank 5 is connected to the solid waste inlet 262 on the cylinder cover 26 via a solid waste return pipe. The solid waste return pipe is equipped with a concentrated slurry delivery pump 9. In this way, the concentrated slurry with a high solid waste content obtained after separation can be returned to the grinding chamber to recover the solid waste particles that flowed out during the slurry circulation process, ensuring that the solid waste particles are fully ground and carbonized, and improving the absorption of carbon dioxide.

[0030] The carbon dioxide gas source 1 is a gas storage tank. The cylinder cover 26 is provided with an outlet 261 connected to the upper portion of the cylinder 21. The outlet 261 is connected to the gas inlet of the gas storage tank via a gas circulation pipe. The gas circulation pipe is also provided with a pressure pump 7. Since residual carbon dioxide may remain after carbon absorption, continuous injection of carbon dioxide will cause the pressure in the cylinder 21 to rise. Using the gas circulation pipe to return excess carbon dioxide to the gas storage tank not only ensures stable pressure in the cylinder 21, but also recovers unreacted carbon dioxide for repeated carbon absorption.

[0031] In addition to using a relatively pure carbon dioxide gas source, this solution can also use purified recycled flue gas as a carbon dioxide gas source. Compared with a pure carbon dioxide gas source, this type of gas source is mixed with inert gases such as nitrogen after purification, so the carbon dioxide content is lower. This method can better achieve the absorption of carbon dioxide, but the carbon dioxide content of the flue gas after the reaction is greatly reduced due to the presence of inert gases. In order to avoid reducing the concentration of carbon dioxide in the gas source after recovery, when using purified flue gas as a carbon dioxide gas source, a gas circulation pipe and a pressure pump thereon are not set, but the gas after the reaction is discharged to the outside.

[0032] The present invention operates as follows: a liquid lubricant is prepared by adding a small amount of surfactant to the conventional grinding liquid. This improves milling efficiency while also adjusting the surface tension of the liquid phase, thereby controlling the size of microbubbles and accelerating the carbonization reaction. Crushed solid waste particles of a certain size are mixed with the liquid and then added to the barrel 21 of a vertical ball mill 2, which contains grinding balls 24 (typically steel balls) serving as the grinding medium.

[0033] The liquid level of the slurry mixed with solid waste particles is higher than the liquid circulation outlet 211. After closing the cylinder cover 26, start the stirring motor 22 for wet ball milling. At the same time, turn on the carbon dioxide gas source 1 and the slurry circulation pump 6. During the grinding process, the slurry is circulated and transported and carbon dioxide is added at the same time.

[0034] The slurry flows out of the liquid circulation outlet 211 and is pumped into the cyclone separator 4 by the slurry circulation pump 6. Most of the solid waste particles enter the concentrated slurry recovery tank 5 along with the concentrated slurry, while the thin slurry containing very few solid waste particles is transported to the micro-bubble generator 3. At the same time, carbon dioxide is also transported to the micro-bubble generator 3 to mix with the thin slurry. After being processed by the micro-bubble generator 3, it forms a slurry mixed with fine bubbles. The slurry mixed with fine bubbles first enters the liquid inlet structure and then evenly enters the grinding slurry from the bottom of the grinding chamber. The fine bubbles of carbon dioxide are quickly and evenly distributed in the slurry, the carbon dioxide quickly dissolves, and the fine bubbles quickly contact the surface of the solid waste particles. At the same time, under the stirring action of the grinding balls 24, the fine bubbles produce a violent stirring and shearing effect on the slurry. In this way, this system can increase the carbonization reaction rate while using the micro-bubbles to impact and peel off the carbonized products on the surface of the solid waste particles, making it difficult for the carbonized product crystals to continue to grow, resulting in a smaller carbonized product particle size.

[0035] The tiny bubbles of carbon dioxide rise from the bottom. Since these tiny bubbles rise slowly, they fully contact the uncarbonized solid waste particles above them. This prolonged contact allows the carbon dioxide to be fully absorbed. After the excess carbon dioxide enters the space above the slurry surface, it is circulated back to the carbon dioxide storage tank via the gas circulation pipe, achieving carbon dioxide recycling and ensuring its full absorption. At the same time, the concentrated slurry in the concentrated slurry recovery tank 5 flows back into the cylinder 21 via the solid waste return pipe and the concentrated slurry delivery pump 9, allowing this portion of the solid waste particles to be fully ground and carbonized, thereby increasing the absorption of carbon dioxide.

[0036] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the inventive concept and technical solution of the present invention, or the inventive concept and technical solution are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A wet ball mill carbonization system using fine bubbles, comprising a vertical ball mill (2) and a carbon dioxide gas source (1), characterized in that: The invention also includes a micro-bubble generator (3), a slurry circulation pump (6) and a slurry circulation pipe (8); the cylinder (21) of the vertical ball mill (2) has built-in grinding balls (24) for wet ball milling of solid waste; the micro-bubble generator (3) is installed at the bottom of the cylinder (21); the outlet of the micro-bubble generator (3) is connected to the inside of the cylinder (21); the liquid inlet (35) of the micro-bubble generator (3) is connected to the liquid circulation outlet (211) on the cylinder (21) through the slurry circulation pipe (8); the slurry circulation pump (6) is provided on the slurry circulation pipe (8); and the carbon dioxide gas source (1) is connected to the gas inlet (36) of the micro-bubble generator (3) through a gas pipe; The vertical ball mill (2) comprises a barrel (21), a stirring mechanism (23), a stirring motor (22) and a barrel cover (26); the stirring motor (22) is mounted on the barrel cover (26); the barrel cover (26) is mounted on the top opening of the barrel (21); the stirring mechanism (23) is located in the barrel (21) and is connected to the output shaft of the stirring motor (22); a liquid inlet structure is provided in the bottom of the barrel (21); the upper portion of the liquid inlet structure is a plurality of liquid inlet grooves (212) communicating with the grinding chamber in the barrel (21); and the lower portion of the liquid inlet structure is a liquid inlet connected to the outlet of the micro-bubble generator (3); The wet ball mill carbonization system further includes a cyclone separator (4) and a concentrated slurry recovery tank (5); the slurry circulation pipe (8) is divided into a first circulation pipe and a second circulation pipe; the first circulation pipe connects the liquid circulation outlet (211) and the inlet of the cyclone separator (4); the slurry circulation pump (6) is provided on the first circulation pipe; the second circulation pipe connects the thin slurry outlet of the cyclone separator (4) and the liquid inlet (35) of the micro-bubble generator (3); the concentrated slurry outlet at the lower end of the cyclone separator (4) is communicated with the concentrated slurry recovery tank (5); The concentrated slurry recovery tank (5) is connected to the solid waste inlet (262) on the cylinder cover (26) through a solid waste return pipe, and a concentrated slurry delivery pump (9) is provided on the solid waste return pipe.

2. The wet ball milling carbonization system using microbubbles according to claim 1, characterized in that: The liquid inlet structure also includes a liquid inlet cavity (28) in the bottom of the cylinder, the shape and size of the top of the liquid inlet cavity (28) are adapted to the shape and size of the bottom of the grinding cavity, the liquid inlet groove (212) is evenly distributed at the bottom of the grinding cavity and communicates with the top of the liquid inlet cavity (28), and the liquid inlet is arranged at the bottom center of the liquid inlet cavity (28).

3. The wet ball milling carbonization system using microbubbles according to claim 1, characterized in that: A plurality of wear-resistant plates (25) are fixedly mounted on the bottom of the cylinder, gaps are left between the wear-resistant plates (25), and the liquid inlet grooves (212) are all located below the gaps between the wear-resistant plates (25).

4. The wet ball milling carbonization system using microbubbles according to claim 1, characterized in that: The micro-bubble generator (3) comprises a generator housing (31), a generator motor (33) mounted at the bottom of the generator housing (31), a bubble crushing mechanism (32), and the outlet. The outlet of the micro-bubble generator (3) is a Venturi tube structure, wherein the diameter of the opening at the top of the outlet is larger than the diameter of the throat portion (38) located in the middle of the outlet, and the diameter of the throat portion (38) is smaller than the diameter of the bottom of the outlet.

5. The wet ball milling carbonization system using microbubbles according to claim 4, characterized in that: A one-way valve (37) is provided at the opening of the outlet top of the micro-bubble generator (3) to prevent slurry from flowing back. The outlet of the micro-bubble generator (3) is connected to the bottom of the cylinder via a sealed rotary joint (39).

6. The wet ball milling carbonization system using microbubbles according to claim 4, characterized in that: A horizontal partition is fixed in the generator housing (31), and the horizontal partition divides the inner cavity of the generator housing (31) into an upper bubble crushing chamber and a lower liquid storage chamber (34). The bubble crushing mechanism (32) includes a central rotating shaft and a bubble shearing blade installed on the central rotating shaft. The central rotating shaft is vertically installed at the center of the inner cavity of the generator housing (31). The lower part of the central rotating shaft passes through the central through hole of the horizontal partition and is connected to the output shaft of the generator motor (33). The bubble shearing blade is installed on the part of the central rotating shaft located above the horizontal partition. The radius of the central through hole is smaller than the radial extension length of the bubble shearing blade. The liquid storage chamber (34) is connected to the liquid inlet (35), and the gas inlet (36) is provided on the side of the liquid inlet (35).

7. The wet ball milling carbonization system using microbubbles according to claim 1, characterized in that: The carbon dioxide gas source (1) is a gas storage tank. The cylinder cover (26) is provided with a gas outlet (261) connected to the upper part of the cylinder body (21). The gas outlet (261) is connected to the gas inlet of the gas storage tank via a gas circulation pipe, and a pressure pump (7) is provided on the gas circulation pipe.

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