Carbonization reactor for producing nano calcium carbonate

Abstract

The utility model relates to the technical field of nano calcium carbonate production, in particular to a carbonization reactor for nano calcium carbonate production, which comprises a grinding kettle body, a seal head is arranged at an opening at the upper end of the grinding kettle body, a motor is mounted on the seal head, a driving rod of the motor is connected with a stirring rod positioned inside the grinding kettle body, and the grinding kettle body comprises a liquid storage part and a conical part. A conical grinding head is arranged in the conical part, a grinding gap is formed between the grinding head and the conical part, the width of the grinding gap is sequentially increased from bottom to top, and the center of the upper end face of the grinding head is fixed to the lower end of the stirring rod; a plurality of evenly-distributed air inlet holes are formed in the wall, located in the sleeve, of the vertical cylinder, a plurality of air inlet branch pipes communicated with the interior of the sleeve are arranged on the outer side face of the sleeve, all the air inlet branch pipes are arranged in parallel and connected with the air outlet end of the carbon dioxide gas cylinder through an air inlet header pipe, and the bottom end of the vertical cylinder is connected with a liquid storage tank. According to the device, the purity of the prepared nano calcium carbonate is improved.

Description

Technical Field

[0001] This utility model relates to the field of nano-calcium carbonate production technology, specifically to a carbonation reactor for nano-calcium carbonate production. Background Technology

[0002] Nano-calcium carbonate refers to calcium carbonate particles or powder with a particle size between 1 and 100 nanometers, also known as ultrafine calcium carbonate or ultramicron calcium carbonate. Due to the ultrafine particle size, the crystal structure and surface electronic structure change, resulting in quantum size effects, small size effects, surface effects, and macroscopic quantum effects that are not present in ordinary calcium carbonate. The main applications of nano-calcium carbonate include plastics, rubber, papermaking, coatings, inks, sealants, pharmaceuticals, and food industries. Its unique reinforcing properties, dispersibility, and stability make it a key functional material.

[0003] Carbonation is the core process for the production of nano-calcium carbonate. It mainly involves calcining limestone to obtain CaO and CO2. CaO is then hydrated to produce a Ca(OH)2 emulsion. The Ca(OH)2 emulsion undergoes a carbonation reaction with CO2 gas. An appropriate crystal form control agent is added to control the crystal form. At the end of carbonation, the desired calcium carbonate slurry is obtained, which is then dehydrated, dried, and surface-treated to obtain the calcium carbonate product.

[0004] Carbonation is a key step in the preparation of nano-calcium carbonate, and the carbonation reactor is an essential piece of equipment for carrying out the carbonation reaction. The structure of the carbonation reactor disclosed in the prior art is as follows:

[0005] For example, CN 217756916 U discloses a calcium carbonate carbonation device, belonging to the technical field of nano-calcium carbonate production devices. It includes a carbonation barrel with a rotating hole on its top surface; and a mixing assembly, which includes an inlet pipe, an outlet pipe, a stirring rod, a fixing frame, and a motor. The inlet pipe is connected to the inside of the carbonation barrel, and the outlet pipe is installed at the output end of the inlet pipe, with multiple outlet holes on its outer wall. In this calcium carbonate carbonation device, the outlet holes in the inlet pipe allow for more carbon dioxide bubbles in the lime slurry, increasing the contact area and improving the reaction effect. Calcium carbonate precipitate falls into the collection pipe and is then collected by a collection tank. The motor drives the stirring rod to rotate, and the stirring rod and blades agitate the lime slurry, generating more bubbles and increasing the contact area during the reaction, resulting in better mixing of the lime slurry and carbon dioxide, thereby improving the carbonation effect.

[0006] For example, CN 217368400 U discloses a carbonation reactor for producing nano-calcium carbonate, including a tank, a shearing assembly, a guide tube, and a bubble generating box. The tank has an inlet at the top and an outlet at the bottom. The shearing assembly extends downwards from the top of the tank into the tank body, and its outer periphery has outwardly and upwardly extending agitator blades for shearing bubbles. The guide tube is disposed on the inner wall of the tank body and sleeved around the agitator blades, used to guide the calcium hydroxide slurry above the guide tube to the bottom of the guide tube. The bubble generating box is disposed inside the tank body and below the shearing assembly. The top of the bubble generating box has several air outlets, and the bubble generating box is connected to an air inlet pipe extending to the outside of the tank body to supply carbon dioxide into the bubble generating box. The carbonation reactor for producing nano-calcium carbonate provided by this utility model shears large bubbles into smaller bubbles, increasing the contact area between carbon dioxide and calcium hydroxide slurry, thus improving production efficiency and product quality.

[0007] All of the above patents improve the air intake mechanism to increase the contact area between the gas and the calcium hydroxide slurry. However, in actual production, due to the uneven crushing of calcium oxide powder after calcination, the calcium hydroxide slurry after the calcium oxide powder reacts with water will produce unreacted calcium oxide particles. The reaction of carbon dioxide with the calcium hydroxide slurry affects the purity of nano-calcium carbonate. Utility Model Content

[0008] To address the technical problem that unreacted particles in calcium hydroxide slurry affect the purity of nano-calcium carbonate after the reaction of carbon dioxide with the calcium hydroxide slurry, this invention provides a carbonation reactor for the production of nano-calcium carbonate, which improves the purity of the obtained nano-calcium carbonate.

[0009] The present invention adopts the following technical solution:

[0010] A carbonation reactor for producing nano-calcium carbonate includes a grinding vessel. A head is provided at the upper opening of the grinding vessel, and a motor is mounted on the upper surface of the head. The motor's drive rod is connected to a stirring rod located inside the grinding vessel. The grinding vessel includes a liquid storage section and a conical section. A conical grinding head is provided inside the conical section, and a grinding gap exists between the grinding head and the conical section. The width of the grinding gap increases from bottom to top. The center of the upper surface of the grinding head is fixed to the lower end of the stirring rod. A vertical cylinder communicating with the bottom of the conical section is provided. A sleeve is fitted onto the outer side of the vertical cylinder. Several evenly distributed air inlet holes are provided on the wall of the vertical cylinder inside the sleeve. Several air inlet branch pipes communicating with the inner surface of the sleeve are provided on the outer side of the sleeve. All air inlet branch pipes are arranged in parallel and are connected to the outlet of a carbon dioxide cylinder through a main air inlet pipe. A liquid storage tank is connected to the bottom of the vertical cylinder.

[0011] It should be further noted that the inner surface of the conical part and the conical surface of the grinding head are both coated with a frosted layer.

[0012] It should be further noted that the present invention also includes a batching tank and a liquid inlet pipe. One end of the liquid inlet pipe is connected to the liquid inlet provided on the side of the liquid storage section, and the other end of the liquid inlet pipe extends into the bottom of the batching tank. A liquid inlet pump is provided on the liquid inlet pipe.

[0013] It should be further noted that this utility model also includes a carbonization reactor and a gas outlet pipe. One end of the gas outlet pipe extends into the bottom of the carbonization reactor, and the other end of the gas outlet pipe is connected to the gas outlet provided on the outer side of the storage tank.

[0014] It should be further noted that the present invention also includes a drain pipe and a drain pump installed on the drain pipe, with the input end of the drain pipe connected to the drain port at the bottom of the storage tank.

[0015] It should be further noted that the output end of the drain pipe is connected to the input end of the dryer.

[0016] It should be further noted that the width of the grinding gap is 0.2~1.0mm. Furthermore, the width of the lowest point of the grinding gap is 0.2mm, and the width of the highest point is 1.0mm.

[0017] The functions of each component in this utility model are as follows:

[0018] End cap and motor: The end cap at the upper opening of the grinding vessel serves as a seal, and the motor on the end cap provides power to the stirring rod. The motor drive rod is connected to the stirring rod, which drives it to rotate inside the grinding vessel.

[0019] Stirring rod: Located inside the grinding vessel, its rotation can make the materials in the vessel mix evenly and promote the reaction.

[0020] Storage compartment: Used to store the calcium hydroxide slurry required for the reaction, providing the material basis for the reaction.

[0021] Conical section and grinding head: A grinding gap of 0.2-1.0 mm exists between the conical grinding head and the conical section itself. When the stirring rod drives the grinding head to rotate, the material is ground within the grinding gap, which helps to fully grind and break down unreacted particles in the calcium hydroxide slurry. These particles react with water to regenerate the calcium hydroxide slurry, while the material particles are refined, increasing the specific surface area of ​​the reaction and accelerating the reaction rate. Furthermore, the inner surface of the conical section and the conical surface of the grinding head are coated with a frosted layer, further enhancing the grinding effect.

[0022] Vertical cylinder and sleeve: The vertical cylinder at the bottom of the conical part fits with the sleeve, and there are several evenly distributed air inlet holes on the wall of the vertical cylinder.

[0023] Inlet branch pipe and inlet main pipe: The inlet branch pipes on the outer side of the sleeve are connected in parallel and are connected to the outlet of the carbon dioxide cylinder through the inlet main pipe to ensure that carbon dioxide can be smoothly delivered to the reaction system.

[0024] The mixing vessel, inlet pipe, and inlet pump are as follows: The mixing vessel is used to prepare the calcium hydroxide slurry required for the reaction. The inlet pipe connects the mixing vessel and the storage section. The inlet pump can transport the material in the mixing vessel to the storage section to realize the supply of materials.

[0025] Carbonization reactor and vent pipe: One end of the vent pipe extends into the bottom of the carbonization reactor, and the other end connects to the vent on the outer side of the storage tank. Unreacted gases can enter the carbonization reactor through the vent pipe for secondary reactions, improving the utilization rate of carbon dioxide and the completeness of the reaction.

[0026] Drain pipe, drain pump and dryer: The drain pipe is connected to the drain port at the bottom of the storage tank. The drain pump draws out the liquid material in the storage tank. The output end of the drain pipe is connected to the input end of the dryer. The dryer can dry the discharged liquid to obtain nano calcium carbonate products that meet the requirements.

[0027] The beneficial effects of this utility model are as follows: The liquid storage section of this utility model can store the prepared calcium hydroxide slurry. Under the action of gravity, it enters the grinding gap between the grinding head and the conical part. The width of the grinding gap gradually increases from bottom to top. Under the condition of the grinding head rotation, the slurry in the grinding gap is ground, and the unreacted calcium oxide particles in the calcium hydroxide slurry are fully ground and broken from top to bottom. After being broken, it reacts with water to generate calcium hydroxide slurry again. The ground calcium hydroxide slurry falls into the vertical cylinder under the action of gravity. At the same time, during the falling process, the carbon dioxide cylinder is activated to spray air into the sleeve. The pressurized carbon dioxide gas enters the vertical cylinder evenly through the air inlet on the vertical cylinder wall. Due to the pressure difference between the sleeve and the vertical cylinder, the falling calcium hydroxide slurry will not enter the sleeve from the air inlet in the opposite direction. The carbon dioxide in the vertical cylinder reacts fully with the falling calcium hydroxide slurry to generate nano-calcium carbonate slurry, which enters the storage tank for temporary storage, thereby improving the purity of the nano-calcium carbonate product. Attached Figure Description

[0028] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model.

[0030] Figure 2 yes Figure 1 Enlarged view of a section within the center circle.

[0031] In the diagram, 1-motor, 2-end cap, 3-grinding vessel body, 31-liquid storage section, 32-conical section, 4-liquid inlet pipe, 5-liquid inlet pump, 6-grinding head, 7-vertical cylinder, 8-air inlet hole, 9-sleeve, 10-main air inlet pipe, 11-carbonization reactor, 12-carbon dioxide cylinder, 13-liquid storage tank, 14-drain pipe, 15-drain pump, 16-batching vessel, 17-air outlet, 18-air outlet pipe, 19-fan, 20-air inlet branch pipe, 21-grinding gap. Detailed Implementation

[0032] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0033] Example 1

[0034] Combination Figure 1 This utility model includes a grinding vessel body 3, with a sealing head 2 at the upper opening of the grinding vessel body 3. A motor 1 is mounted on the upper surface of the sealing head 2, and the drive rod of the motor 1 is connected to a stirring rod 22 located inside the grinding vessel body 3. The grinding vessel body 3 includes a liquid storage part 31 and a conical part 32. A conical grinding head 6 is provided inside the conical part 32, and a grinding gap 21 is provided between the grinding head 6 and the conical part 32. Figure 2 The width of the grinding gap 21 increases from bottom to top. The center of the upper end face of the grinding head 6 is fixed to the lower end of the stirring rod 22. The bottom of the conical part 32 is provided with a vertical cylinder 7 that communicates with it. A sleeve 9 is fitted on the outer side of the vertical cylinder 7. Several evenly distributed air inlet holes 8 are provided on the wall of the vertical cylinder 7 located inside the sleeve 9. Several air inlet branch pipes 20 that communicate with the interior are provided on the outer side of the sleeve 9. All air inlet branch pipes 20 are arranged in parallel and are connected to the outlet end of the carbon dioxide cylinder 12 through the main air inlet pipe 10. A liquid storage tank 13 is connected to the bottom end of the vertical cylinder 7.

[0035] The working process of this utility model is as follows:

[0036] The storage section 31 can store the prepared calcium hydroxide slurry (reagents necessary for the reaction, such as crystal form control agents and pH adjusters, can be added to the storage section 31, and the dosage can be adjusted according to actual production). The material in the storage section 31 enters the grinding gap 21 between the grinding head 6 and the conical section 32 under the action of gravity. The width of the grinding gap 21 increases from bottom to top. The motor 1 is started to drive the grinding head 6 to rotate. Under the condition of the grinding head 6 rotating, the slurry in the grinding gap 21 is ground, and the unreacted calcium oxide particles in the calcium hydroxide slurry are fully ground and broken from top to bottom. After being broken, it reacts with water to generate calcium hydroxide slurry again. The ground calcium hydroxide slurry falls into the vertical cylinder 7 under the action of gravity. At the same time, during the falling process, the carbon dioxide cylinder 12 is started to spray gas into the sleeve 9. The carbon dioxide gas enters the vertical cylinder 7 evenly through the air inlet 8 on the wall of the vertical cylinder 7 and reacts fully with the falling calcium hydroxide slurry to generate nano calcium carbonate slurry, which enters the storage tank for temporary storage.

[0037] In some specific embodiments, the inner surface of the conical portion 32 and the conical surface of the grinding head 6 are coated with a frosted layer, which can further enhance the grinding effect.

[0038] In some specific embodiments, the present invention also includes a mixing tank 16 and an inlet pipe 4. One end of the inlet pipe 4 is connected to an inlet port provided on the side of the storage section 31, and the other end of the inlet pipe 4 extends into the bottom of the mixing tank 16. An inlet pump 5 is provided on the inlet pipe 4. The mixing tank 16 is used to prepare the calcium hydroxide slurry required for the reaction. The inlet pipe 4 connects the mixing tank 16 and the storage section 31. The inlet pump 5 can transport the material in the mixing tank 16 to the storage section 31 to realize the supply of material.

[0039] In some specific embodiments, the present invention also includes a carbonization reactor 11 and a gas outlet pipe 18. One end of the gas outlet pipe 18 extends into the bottom of the carbonization reactor 11, and the other end of the gas outlet pipe 18 is connected to a gas outlet 17 provided on the outer side of the storage tank 13. A fan 19 is provided on the gas outlet pipe 18. Incompletely reacted carbon dioxide gas can enter the carbonization reactor 11 through the gas outlet pipe 18 to undergo a secondary reaction with the calcium hydroxide slurry, thereby improving the utilization rate of carbon dioxide and the completeness of the reaction.

[0040] In some specific embodiments, the present invention further includes a drain pipe 14 and a drain pump 15 disposed on the drain pipe 14. The input end of the drain pipe 14 is connected to a drain port disposed at the bottom of the storage tank 13, and the output end of the drain pipe 14 is connected to the input end of the dryer. The drain pump 15 extracts the nano-carbon dioxide slurry from the storage tank 13, and the output end of the drain pipe 14 is connected to the input end of the dryer. The dryer can dry the incoming nano-carbon dioxide slurry to obtain a nano-calcium carbonate product that meets the requirements.

[0041] In some specific embodiments, the width of the grinding gap 21 is 0.2~1.0 mm. Furthermore, the width of the lowermost end of the grinding gap 21 is 0.2 mm, and the width of the uppermost end of the grinding gap 21 is 1.0 mm.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A carbonation reactor for producing nano calcium carbonate, characterized by, The device includes a grinding vessel body with a cap at the top opening. A motor is mounted on the upper surface of the cap, and the motor's drive rod is connected to a stirring rod located inside the grinding vessel body. The grinding vessel body includes a liquid storage section and a conical section. A conical grinding head is located inside the conical section, and there is a grinding gap between the grinding head and the conical section. The width of the grinding gap increases from bottom to top. The center of the upper surface of the grinding head is fixed to the lower end of the stirring rod. A vertical cylinder communicating with the bottom of the conical section is provided. A sleeve is fitted on the outer side of the vertical cylinder. Several evenly distributed air inlet holes are provided on the wall of the vertical cylinder inside the sleeve. Several air inlet branch pipes communicating with the interior of the sleeve are provided on the outer side of the sleeve. All air inlet branch pipes are arranged in parallel and are connected to the outlet of a carbon dioxide cylinder through a main air inlet pipe. A liquid storage tank is connected to the bottom of the vertical cylinder.

2. The carbonization reactor for producing nano calcium carbonate according to claim 1, characterized in that, The inner surface of the conical part and the conical surface of the grinding head are both coated with a frosted layer.

3. The carbonization reactor for producing nano-sized calcium carbonate according to claim 1 or 2, wherein It also includes a batching tank and a liquid inlet pipe. One end of the liquid inlet pipe is connected to the liquid inlet provided on the side of the liquid storage section, and the other end of the liquid inlet pipe extends into the bottom of the batching tank. A liquid inlet pump is provided on the liquid inlet pipe.

4. The carbonization reactor for producing nano-sized calcium carbonate according to claim 1 or 2, wherein It also includes a carbonization reactor and an exhaust pipe. One end of the exhaust pipe extends into the bottom of the carbonization reactor, and the other end of the exhaust pipe is connected to an exhaust port set on the outer side of the storage tank.

5. The carbonization reactor for producing nano-sized calcium carbonate according to claim 1 or 2, wherein It also includes a drain pipe and a drain pump installed on the drain pipe, with the input end of the drain pipe connected to the drain port at the bottom of the storage tank.

6. The carbonization reactor for producing nano calcium carbonate according to claim 5, wherein The output end of the drain pipe is connected to the input end of the dryer.

7. The carbonization reactor for producing nano-sized calcium carbonate according to claim 1 or 2, wherein The width of the grinding gap is 0.2~1.0mm.

8. The carbonization reactor for producing nano calcium carbonate according to claim 7, characterized in that, The width of the lowest grinding gap is 0.2 mm, and the width of the highest grinding gap is 1.0 mm.

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