Device for preparing nano calcium carbonate

Abstract

The utility model relates to a device for preparing nano calcium carbonate, which comprises a supergravity reactor, a circulating tank, a pump body, a heat exchanger, a first homogenizing tank, an activation kettle and a second homogenizing tank, the pump body is arranged on the access pipeline and conveys calcium hydroxide slurry in the circulating tank into the supergravity reactor, the heat exchanger is provided with a heat pipe part and a cold pipe part, the heat pipe part is connected with the access pipeline and exchanges heat with the cold pipe part, and the supergravity reactor is provided with a gas inlet pipeline for gas to enter and a gas outlet pipeline for gas to flow out. And the circulating tank is sequentially connected with the first homogenizing tank, the activating kettle and the second homogenizing tank.

Description

Technical Field

[0001] The utility model relates to a preparation device, in particular to a device for preparing nano calcium carbonate. Background Art

[0002] Nano-calcium carbonate refers to light calcium carbonate with nanometer-scale dimensions. Due to its non-irritating and non-toxic properties, high whiteness, good color, and small particle size, nano-calcium carbonate exhibits surface effects, small size effects, quantum size effects, and macroscopic quantum tunneling effects that are absent from ordinary calcium carbonate. Its unique nanomaterial properties give it significant advantages in magnetism, light and heat resistance, catalytic properties, and melting point, making it a new type of functional inorganic material. It is widely used in a wide range of applications, including rubber, plastics, coatings, inks, and papermaking.

[0003] At present, additives are often needed in the preparation of nano-calcium carbonate, which leads to an increase in manufacturing costs. In addition, the liquid circulating in the equipment will always contain additives and needs to be replaced regularly. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a device for preparing nano calcium carbonate.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: including a high-gravity reactor, a circulation tank, a pump body, a heat exchanger, a first homogenization tank, an activation kettle and a second homogenization tank, the circulation tank having an access pipe connected to the top of the high-gravity reactor and an outlet pipe connected to the bottom of the high-gravity reactor, the pump body is arranged on the access pipe and transports the calcium hydroxide slurry in the circulation tank to the high-gravity reactor, the heat exchanger has a hot pipe part and a cold pipe part, the hot pipe part is connected to the access pipe and performs heat exchange with the cold pipe part, the high-gravity reactor has an air inlet pipe for gas to enter and an air outlet pipe for gas to flow out, and the circulation tank is connected to the first homogenization tank, the activation kettle and the second homogenization tank in sequence.

[0006] By adopting the above technical solution, the calcium hydroxide slurry is repeatedly circulated in the high-gravity reactor and the circulation tank, thereby increasing the absorption of carbon dioxide, and the heat exchanger allows the heat generated in the reaction to be absorbed before the next circulation reaction, avoiding the influence of temperature on the absorption reaction, until the pH value of the liquid is no higher than 7, indicating that it has become a calcium carbonate slurry. It then passes through the subsequent first homogenization tank, activation kettle and second homogenization, and is allowed to stand, modified and allowed to stand again, so that the obtained product particle size is uniform. In addition, due to the use of the high-gravity reactor, the calcium hydroxide slurry forms a droplet shape after entering, and reacts with the carbon dioxide gas introduced into the equipment, and carbonization is achieved during the gas-liquid contact process, so that part of the calcium hydroxide is converted into calcium carbonate. Due to the droplet particles generated by the specific structure in the high-gravity reactor The particles are small, have a large specific surface area, and are in full and uniform contact with the gas and liquid, which can produce a large number of reaction centers. The gas-liquid residence time inside the equipment is short, which limits the growth of the crystal nuclei and achieves the effect of controlling the particle size of calcium carbonate. The gas-liquid contact time is similar, so that the growth rate of each crystal nucleus is basically the same, so the surface can ensure that the product particle size is uniform and the distribution is narrow. At the same time, due to the short contact time between the gas and liquid phases, the CaO particles precipitated in the reaction surface process are not easy to deposit on the surface of the equipment, and it is not easy to generate heavy crystals, twins and secondary condensation, which is conducive to controlling the crystal shape and particle size of the product. The reaction temperature can be controlled by the heat exchanger, without the use of additional catalysts, the reaction time is short, and the effect of adding a catalyst can be achieved by controlling the rotation speed of the ultra-gravity reactor and the temperature of the liquid in the equipment, that is, the addition of the catalyst has little effect on the overall effect.

[0007] The present invention is further configured as follows: the ultra-gravity reactor includes a shell, a motor, a rotating rod, a liquid main pipe and a gas main pipe. The rotating rod is arranged in the shell along the vertical rotation. The motor is arranged in the shell and drives the rotating rod to rotate. The rotating rod is provided with a plurality of rotating parts distributed vertically. The gas main pipe is arranged on one side of the shell and is connected with the gas inlet pipe. The gas main pipe has a plurality of gas branch pipes extending to the opposite side of the rotating parts. The liquid main pipe is arranged on the other side of the shell opposite to the gas main pipe and is connected with the access pipe. The liquid main pipe has a liquid branch pipe opposite to the gas branch pipe. The gas outlet pipe is arranged on the side wall of the shell and is located below the gas main pipe. The outlet pipe is arranged at the bottom of the shell; the rotating part includes blades, shaft sleeves and vertical plates. The shaft sleeve is sleeved on the rotating rod and rotates with the rotating rod. The blade ring is arranged on the shaft sleeve. The plurality of vertical plates are distributed on the blades in the transverse direction and the vertical plates are arranged on the blades in the vertical direction.

[0008] By adopting the above technical solution, when the high-gravity reactor is needed to work, the calcium hydroxide slurry enters the liquid main pipe through the access pipe, then enters the shell through the liquid distribution pipe, and is formed into droplets by the blades. At the same time, carbon dioxide gas is introduced through the gas distribution pipe, thereby increasing the contact area between the two. Under the action of gravity, the carbon dioxide gas will quickly pass through the high-gravity reactor. The gas and liquid residence time in the equipment is short, which limits the growth of crystal nuclei and achieves the effect of controlling the particle size of calcium carbonate.

[0009] The utility model is further configured as follows: the gas branch pipe includes an upper branch pipe and a side branch pipe, one end of the upper branch pipe is connected to the gas main pipe, and the other end is arranged at the top of the shell and opposite to the blades at the top; one end of the side branch pipe is connected to the gas main pipe, and the other end is arranged on the side of the shell and opposite to the blades.

[0010] The utility model is further configured as follows: a rotary vibrating screen for filtering is provided between the first homogenizing tank and the activation kettle, and the rotary vibrating screen is also connected to a slurry barrel for storing waste materials.

[0011] By adopting the above technical solution, the calcium carbonate slurry after the reaction is completed may contain some large particles or differences in slurry concentration due to incomplete front-end filtration. After standing, it is filtered to ensure the particle size and structure.

[0012] The utility model is further configured to include a modifier configuration kettle, which is connected to the activation kettle and provides the modifier for the activation kettle.

[0013] By adopting the above technical solution, in the modifier preparation kettle, according to the selected modifier type, the components that need to react on their own are selected for preparation, or the modifier product is directly used, or the modifier is diluted.

[0014] The utility model is further configured to include: a plate and frame filter press, which is connected to the second homogenizing tank.

[0015] By adopting the above technical solution, the calcium carbonate slurry is subjected to a filter press dehydration operation through a plate and frame filter press, and then drying or re-washing, filter pressing, and drying are selected according to the actual situation. The utility model is further configured as follows: S1, adding the calcium hydroxide slurry to the circulation tank; S2, transporting the calcium hydroxide slurry in the circulation tank through the pump body, cooling it through the heat exchanger and sending it to the supergravity reactor, and at the same time, inputting carbon dioxide into the supergravity reactor through the gas inlet pipe, and the motor drives the rotating rod to rotate and drive the blades to rotate. The calcium hydroxide slurry is dispersed from the liquid main pipe to each liquid branch pipe and enters the shell to be atomized by the blades, and carbon dioxide also enters through the gas branch pipe, and then the slurry that absorbs carbon dioxide returns to the supergravity reactor through the outlet pipe. circulation tank; S3, repeat S2 until the pH value of the slurry is no more than 7 to become calcium carbonate slurry; S4, the calcium carbonate slurry is allowed to stand in the first homogenization tank, and then the large particles are filtered through a rotary vibrating screen and transported to the activation kettle; S5, the modifier is prepared in the modifier preparation kettle and the modifier is transported to the activation kettle to modify the calcium carbonate slurry; S6, the modified calcium carbonate slurry in the activation kettle is transported to the second homogenization tank for standing; S7, the calcium carbonate slurry in S6 is transported to a plate and frame filter press for filtration and dehydration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall process flow of the utility model;

[0017] Figure 2 This is a simplified structural diagram of the high-gravity reactor of the utility model;

[0018] Figure 3 This is a comparison chart of experimental data corresponding to the present utility model.

[0019] In the figure: 1. Supergravity reactor; 10. Rotating part; 101. Blade; 102. Bushing; 103. Vertical plate; 11. Inlet pipe; 12. Outlet pipe; 13. Gas inlet pipe; 14. Gas outlet pipe; 15. Shell; 16. Motor; 17. Rotating rod; 18. Liquid main pipe; 181. xx; 19. Gas main pipe; 191. Gas branch pipe; 192. Upper branch pipe; 193. Side branch pipe; 2. Circulation tank; 3. Pump body; 4. Heat exchanger; 41. Hot pipe section; 42. Cold pipe section; 5. First homogenizing tank; 6. Activation kettle; 61. Modifier preparation kettle; 7. Second homogenizing tank; 8. Vibrating screen; 81. Slurry barrel; 9. Plate and frame filter press. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] like Figure 1-3As shown, the utility model discloses a device for preparing nano-calcium carbonate, comprising a high-gravity reactor 1, a circulation tank 2, a pump body 3, a heat exchanger 4, a first homogenizing tank 5, an activation kettle 6 and a second homogenizing tank 7. The circulation tank 2 has an access pipe 11 connected to the top of the high-gravity reactor 1 and an outlet pipe 12 connected to the bottom of the high-gravity reactor 1. The pump body 3 is arranged on the access pipe 11 and transports the calcium hydroxide slurry in the circulation tank 2 to the high-gravity reactor 1. The heat exchanger 4 has a hot pipe part 41 and a cold pipe part 42. The hot pipe part 41 is connected to the access pipe 11. And heat exchange is performed with the cold pipe part 42. The high-gravity reactor 1 has a gas inlet pipe 13 for gas to enter and a gas outlet pipe 14 for gas to flow out. The circulation tank 2 is connected to the first homogenization tank 5, the activation kettle 6 and the second homogenization tank 7 in sequence, so that the calcium hydroxide slurry is repeatedly circulated in the high-gravity reactor 1 and the circulation tank 2, thereby increasing the absorption of carbon dioxide. The heat exchanger 4 allows the heat generated in the reaction to be absorbed before the next circulation reaction to avoid the influence of temperature on the absorption reaction, until the pH value of the liquid is no higher than 7, indicating that it has become a calcium carbonate slurry. Then, through the subsequent first homogenization tank 5, activation kettle 6 and second homogenization, it is allowed to stand, modified and allowed to stand again, so that the particle size of the obtained product is uniform. In addition, due to the use of the high-gravity reactor 1, the calcium hydroxide slurry forms a droplet shape after entering the device, and reacts with the carbon dioxide gas introduced into the device. Carbonization is achieved during the gas-liquid contact process, and part of the calcium hydroxide is converted into calcium carbonate. Since the droplets generated by the specific structure in the high-gravity reactor 1 are small and have a large specific surface area, the gas-liquid contact is sufficient and uniform, and a large number of reaction centers can be generated. The gas-liquid residence time inside the device is short. The growth of crystal nuclei is restricted to achieve the effect of controlling the particle size of calcium carbonate; the gas-liquid contact time is similar, so that the growth rate of each crystal nucleus is basically the same, so the surface can ensure that the product particle size is uniform and the distribution is narrow; at the same time, since the gas-liquid two-phase contact time is short, the CaO particles precipitated in the reaction surface process are not easy to deposit on the surface of the equipment, and it is not easy to generate heavy crystals, twins and secondary agglomeration, which is beneficial to controlling the crystal shape and particle size of the product, and the effect of adding a catalyst can be achieved by controlling the rotation speed of the high-gravity reactor 1 and the temperature of the liquid in the equipment, that is, the addition of the catalyst has little effect on the overall effect.

[0023] The supergravity reactor 1 includes a shell 15, a motor 16, a rotating rod 17, a liquid main pipe 18 and a gas main pipe 19. The rotating rod 17 is arranged in the shell 15 to rotate vertically. The motor 16 is arranged in the shell 15 and drives the rotating rod 17 to rotate. The rotating rod 17 is provided with a plurality of rotating parts 10 distributed vertically. The gas main pipe 19 is arranged on one side of the shell 15 and is connected to the gas inlet pipe 13. The gas main pipe 19 has a plurality of gas branch pipes 191 extending to the opposite side of the rotating parts 10. The liquid main pipe 18 is arranged on the other side of the shell 15 relative to the gas main pipe 19 and is connected to the access pipe 11. The liquid main pipe 18 has a liquid branch pipe 181 opposite to the gas branch pipe 191. The gas outlet pipe 14 is arranged on the side wall of the shell 15 and is located below the gas main pipe 19. The outlet pipe 12 is arranged at the bottom of the shell 15. The moving part 10 includes a blade 101, a sleeve 102 and a vertical plate 103. The sleeve 102 is sleeved on the rotating rod 17 and rotates with the rotating rod 17. The blade 101 is annularly arranged on the sleeve 102. Multiple vertical plates 103 are distributed laterally on the blade 101 and the vertical plates 103 are vertically arranged on the blade 101. When the supergravity reactor 1 is needed to work, the calcium hydroxide slurry enters the liquid main pipe 18 through the access pipe 11, and then enters the shell 15 through the liquid distribution pipe 181. The blade 101 converts the calcium hydroxide slurry into droplets. At the same time, carbon dioxide gas is introduced through the gas distribution pipe 191 to increase the contact area between the two. Under the action of gravity, it will quickly pass through the supergravity reactor 1. The gas and liquid residence time in the equipment is short, which limits the growth of the crystal nucleus and achieves the effect of controlling the particle size of calcium carbonate.

[0024] The gas branch pipe 191 includes an upper branch pipe 192 and a side branch pipe 193. One end of the upper branch pipe 192 is connected to the gas main pipe 19, and the other end is arranged at the top of the shell 15 and opposite to the blade 101 located at the top. One end of the side branch pipe 193 is connected to the gas main pipe 19, and the other end is arranged on the side of the shell 15 and opposite to the blade 101.

[0025] A rotary vibrating screen 8 for filtering is provided between the first homogenizing tank 5 and the activation kettle 6. The rotary vibrating screen 8 is also connected to a slurry barrel 81 for storing waste. The calcium carbonate slurry after the reaction is completed may contain some large particles or differences in slurry concentration due to incomplete front-end filtration. After standing, it is filtered to ensure the particle size and structure.

[0026] It also includes a modifier configuration kettle 61, which is connected to the activation kettle 6 and provides the modifier for the activation kettle 6. In the modifier configuration kettle 61, according to the type of modifier selected, the components that need to react by themselves are selected for preparation, or the modifier products are directly used, or the modifier is diluted, etc.

[0027] It also includes a plate and frame filter press 9, which is connected to the second homogenizing tank 7. The calcium carbonate slurry is subjected to a filter pressing and dehydration operation through the plate and frame filter press 9, and then selected to be dried or washed, filtered, and dried again according to the actual situation. Reaction principle: With the development of science and technology, people have been able to prepare pure metals, metal oxides, intermetallic compounds, carbides, oxides and their composite materials with a particle size below 100nm, but it is difficult to prepare nano salt compounds. This is mainly because the preparation process of nano salt compounds usually involves multiple steps such as interphase transfer, reaction and crystallization. It not only affects the speed of the process and production efficiency, but more importantly, it significantly affects the morphology of the product (particle size, particle size distribution, crystal composition, etc.), thereby affecting the performance of the product. Therefore, in order to prepare nano calcium carbonate with a narrow distribution, the interphase transfer and microscopic mixing process must be strengthened as much as possible, and ultra-gravity technology has unique advantages in this regard;

[0028] According to the estimation: characteristic nucleation time (i.e. nucleation induction period) is about 1ms. According to the micro-mixing theory, the micro-mixing homogenization characteristic time The calculation formula is:

[0029]

[0030] Where: constant, the size of which varies with different reactors; is the dynamic viscosity, which is m / s; is the energy dissipation rate per unit mass. According to the above formula, in a traditional stirred tank (or bubble) reactor, e is 0.1~10 W / g, so it can be estimated that ,visible This indicates that in the traditional reactor, the nucleation process is carried out in a non-uniform microenvironment, and the micro-mixing state seriously affects the nucleation process. This is the theoretical root cause of the uneven particle size distribution and poor batch reproducibility in the current traditional precipitation method for preparing particles. On the contrary, under high gravity conditions, the mixed mass transfer in the high gravity reactor is greatly enhanced, and the mass transfer coefficient is increased by 10 to 1000 times compared with conventional equipment. It is estimated that =0.4~0.04 ms or less (depending on operating conditions), so , which can make the nucleation process proceed in a micro-uniform environment, thus making the nucleation process controllable and narrowing the particle size distribution; it can be seen that the high gravity method overcomes the shortcomings of the normal gravity method. In the high gravity rotating packed bed, At the 10us level, it can be guaranteed , increase the controllability of homogeneous nucleation, and in a hypergravity environment, greatly enhance interphase mass transfer and micro-mixing, thereby greatly improving the dissolution rate of calcium hydroxide and the absorption rate of carbon dioxide, so that the calcium ions and calcium carbonate ions in the reaction system can be rapidly increased instantly, the supersaturation is improved, and the number of calcium carbonate nuclei in the system is greatly increased, and cubic nano-calcium carbonate products with small particle size and uniform distribution are prepared; The characteristics of the hypergravity carbonization method are that it can not only shorten the carbonization reaction time exponentially, but also prepare ultrafine calcium carbonate products with an average equivalent diameter of 15~40 nm and a very narrow distribution. In addition, its equipment is small in size, and the investment in equipment cost is greatly reduced, which reduces production costs, replaces imports, and improves its competitiveness in the international market.

[0031] According to the law of mass action, the increase in calcium hydroxide concentration can accelerate the reaction rate, increase the supersaturation of calcium carbonate in the solution, increase the nucleation and growth rate of the crystals, and is conducive to the formation of smaller crystals. Macroscopically, it manifests as smaller crystals and narrower particle size distribution. Under normal conditions, the higher the initial concentration of calcium hydroxide, the more significantly the viscosity of the reaction system increases, and gelation is prone to occur, which is not conducive to the movement of the crystal nucleus particles. Macroscopically, it manifests as a decrease in the content of calcium carbonate whiskers in the product, a wider particle size distribution, and the occurrence of agglomeration. Under high gravity and high centrifugal force conditions, the movement speed of the crystal nucleus particles is accelerated, and the agglomeration phenomenon in the high gravity field is weakened. For other principle descriptions, please refer to "Preparation of Calcium Carbonate with Different Morphologies by High Gravity Reaction Crystallization Method and Its Template Application_He Xin".

[0032] The formation process of calcium carbonate crystals includes two stages, namely the formation of crystal nuclei and the growth of crystal nuclei. The more commonly accepted expression is:

[0033] )n

[0034] )q

[0035] Jn is the nucleation rate number, G is the linear growth rate of calcium carbonate crystals; Kn is the nucleation rate constant, Kq is the growth rate constant; n and q are constants, and Ksp is the solubility product constant.

[0036] The nucleation and growth of calcium carbonate are both extremely rapid processes. A slight increase in supersaturation will cause significant changes in the nucleation and growth rates, with the nucleation rate changing even more. In a hypergravity environment, interphase mass transfer and micromixing can be greatly enhanced, thereby greatly increasing the dissolution rate of Ca(OH)2 and the CO2 absorption rate, allowing the calcium ions and carbonate ions in the reaction system to increase rapidly and instantly, increasing the supersaturation and resulting in a large increase in the number of CaCO3 crystal nuclei in the system, producing a small and uniformly distributed CaCO3 product. Although the crystal nucleus growth rate increases, the reaction time is insufficient for it to grow into larger particles, thus limiting the upper limit of the volume of calcium carbonate crystals.

[0037] During the supergravity process, increasing the centrifugal acceleration will greatly enhance the gas-liquid-solid heat and mass transport, rapidly update the phase interface, and increase the volume mass transfer coefficient to more than 10-1000 times that of a conventional carbonization kettle or carbonization tower, thereby greatly improving the Ca(OH)2 dissolution and CO2 absorption rates, increasing the Ca2+ and CO32- concentrations in the system microelement, and improving the supersaturation.

[0038] Process flow: S1, add calcium hydroxide slurry to the circulation tank 2; S2, the calcium hydroxide slurry in the circulation tank 2 is transported through the pump body 3, cooled by the heat exchanger 4 and then into the high gravity reactor 1, at the same time, carbon dioxide is input into the high gravity reactor 1 through the gas inlet pipe 13, and the motor 16 drives the rotating rod 17 to rotate and drives the blade 101 to rotate. The calcium hydroxide slurry is dispersed from the liquid main pipe 18 to each liquid branch pipe 181 and enters the shell 15. It is atomized by the blade 101, and carbon dioxide also enters through the gas branch pipe 191. Then the slurry that absorbs carbon dioxide is discharged through the outlet pipe. The calcium carbonate slurry is returned to the circulation tank 2 through the channel 12; S3, repeating S2 until the pH value of the slurry is no more than 7 to become a calcium carbonate slurry; S4, the calcium carbonate slurry is allowed to stand by the first homogenizing tank 5, and then the large particles are filtered by the rotary vibrating screen 8 and transported to the activation kettle 6; S5, the modifier is prepared in the modifier preparation kettle 61 and the modifier is transported to the activation kettle 6 to modify the calcium carbonate slurry; S6, the modified calcium carbonate slurry in the activation kettle 6 is transported to the second homogenizing tank 7 for standing; S7, the calcium carbonate slurry in S6 is transported to the plate and frame filter press 9 for pressure filtration and dehydration.

Claims

1. A device for preparing nano calcium carbonate, characterized in that: The invention comprises a high-gravity reactor (1), a circulation tank (2), a pump body (3), a heat exchanger (4), a first homogenizing tank (5), an activation kettle (6) and a second homogenizing tank (7), wherein the circulation tank (2) has an access pipe (11) connected to the top of the high-gravity reactor (1) and an outlet pipe (12) connected to the bottom of the high-gravity reactor (1), the pump body (3) is arranged on the access pipe (11) and transports the calcium hydroxide slurry in the circulation tank (2) to the high-gravity reactor (1), the heat exchanger (4) has a hot pipe part (41) and a cold pipe part (42), the hot pipe part (41) is connected to the access pipe (11) and performs heat exchange with the cold pipe part (42), the high-gravity reactor (1) has a gas inlet pipe (13) for gas to enter and a gas outlet pipe (14) for gas to flow out, and the circulation tank (2) is connected to the first homogenizing tank (5), the activation kettle (6) and the second homogenizing tank (7) in sequence.

2. A device for preparing nano-calcium carbonate according to claim 1, characterized in that: The ultra-gravity reactor (1) comprises a housing (15), a motor (16), a rotating rod (17), a liquid main pipe (18) and a gas main pipe (19). The rotating rod (17) is arranged in the housing (15) to rotate vertically. The motor (16) is arranged in the housing (15) and drives the rotating rod (17) to rotate. The rotating rod (17) is provided with a plurality of rotating parts (10) distributed vertically. The gas main pipe (19) is arranged on one side of the housing (15) and is connected to the gas inlet pipe (13). The gas main pipe (19) has a plurality of gas distribution pipes (191) extending to the opposite side of the rotating member (10), the liquid main pipe (18) is arranged on the other side of the shell (15) relative to the gas main pipe (19) and is connected to the access pipe (11), the liquid main pipe (18) has a liquid distribution pipe (181) opposite to the gas distribution pipe (191), the gas outlet pipe (14) is arranged on the side wall of the shell (15) and is located below the gas main pipe (19), and the outlet pipe (12) is arranged at the bottom of the shell (15).

3. A device for preparing nano-calcium carbonate according to claim 2, characterized in that: The rotating member (10) comprises a blade (101), a shaft sleeve (102) and a vertical plate (103); the shaft sleeve (102) is sleeved on the rotating rod (17) and rotates with the rotating rod (17); the blade (101) is arranged around the shaft sleeve (102); a plurality of vertical plates (103) are distributed on the blade (101) in the transverse direction and are arranged on the blade (101) in the vertical direction.

4. A device for preparing nano-calcium carbonate according to claim 3, characterized in that: The gas branch pipe (191) includes an upper branch pipe (192) and a side branch pipe (193). One end of the upper branch pipe (192) is connected to the gas main pipe (19), and the other end is arranged at the top of the shell (15) and opposite to the blade (101) located at the top. One end of the side branch pipe (193) is connected to the gas main pipe (19), and the other end is arranged at the side of the shell (15) and opposite to the blade (101).

5. A device for preparing nano-calcium carbonate according to claim 1, characterized in that: A rotary vibrating screen (8) for filtering is provided between the first homogenizing tank (5) and the activation kettle (6), and the rotary vibrating screen (8) is also connected to a slurry barrel (81) for storing waste materials.

6. A device for preparing nano-calcium carbonate according to claim 1, characterized in that: The invention also includes a modifier configuration kettle (61), which is connected to the activation kettle (6) and provides the modifier to the activation kettle (6).

7. A device for preparing nano-calcium carbonate according to claim 1, characterized in that: It also includes a plate and frame filter press (9), which is connected to the second homogenizing tank (7).

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