Mixing device for producing magnesium-aluminum hydrotalcite

Abstract

The utility model discloses a mixing device for producing magnesium-aluminum hydrotalcite, which comprises a mixing tank body, a main pipe is rotatably mounted in the middle of the mixing tank body, and a stirring device is mounted on the main pipe; a second feeding pipe is horizontally and fixedly mounted at the bottom of the main pipe, an inner runner of the second feeding pipe is communicated with an inner runner of the main pipe, and a plurality of second spray heads are arranged at the lower end of the second feeding pipe; a material mixing channel is vertically arranged on one side of the mixing tank body, and the bottom of the material mixing channel is communicated with the bottom of the mixing tank body, so that mixed liquid in the material mixing channel flows into the bottom in the mixing tank body; a conveying auger is arranged at the top of the mixing channel, and a first feeding pipe and a feeding hopper are sequentially arranged above the feeding end of the conveying auger in the conveying direction. According to the magnesium-aluminum hydrotalcite mixing device, mixing is carried out twice, stirring is more thorough, the mixing effect is good, and the purity of magnesium-aluminum hydrotalcite can be guaranteed.

Description

Technical Field

[0001] This utility model relates to a mixing device for the production of magnesium-aluminum hydrotalcite, belonging to the field of magnesium-aluminum hydrotalcite mixing technology. Background Technology

[0002] Magnesium aluminum hydrotalcite (Mg / Al-LDHs) is a functional material. It can be used as a flame retardant in the preparation of flame-retardant materials and as an acid absorber in the plastics heat stabilizer industry. When the magnesium-to-aluminum molar ratio is 2, the molecular formula of magnesium aluminum hydrotalcite can be represented as 4Mg2Al(OH)12CO3•4H2O.

[0003] There are several preparation processes for magnesium aluminum hydrotalcite, among which the most commonly used preparation method is the co-precipitation method. The preparation process of the precipitation method is as follows: powdered magnesium source (magnesium nitrate) and aluminum source (aluminum nitrate) are dissolved in a salt solution, and then the dissolved mixture is thoroughly mixed with an alkaline solution (such as sodium hydroxide and sodium carbonate). After the mixing reaction is completed, the powdered magnesium aluminum hydrotalcite is obtained by crystallization, filtration, washing and drying.

[0004] The above-mentioned preparation process includes mixing magnesium and aluminum sources with salt solutions, as well as mixing the dissolved mixture with an alkaline solution. There are two existing mixing processes: one is to use two separate mixing devices to mix magnesium and aluminum sources with salt solutions and to mix the dissolved mixture with an alkaline solution. This mixing method can meet the process requirements, but it is inconvenient to control parameters simultaneously using two separate devices, and it is also costly and bulky. The other is to use one mixing device to put magnesium source, aluminum source, salt solution and alkaline solution into one mixing device. This mixing method is simpler, but the mixing quality is poor, and the generated magnesium-aluminum hydrotalcite is mixed with impurities.

[0005] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0006] To address the shortcomings of the prior art, this utility model provides a mixing device for the production of magnesium-aluminum hydrotalcite, which performs mixing in two stages, resulting in more thorough stirring, better mixing effect, and ensuring the purity of magnesium-aluminum hydrotalcite.

[0007] To solve the above technical problems, the present invention adopts the following technical solution:

[0008] A mixing device for the production of magnesium aluminum hydrotalcite includes a mixing tank, a main pipe rotatably installed in the middle of the mixing tank, and a stirring device installed on the main pipe.

[0009] A second feeding pipe is fixedly installed horizontally at the bottom of the main pipe. The inner flow channel of the second feeding pipe is connected to the inner flow channel of the main pipe. Multiple second nozzles are provided at the lower end of the second feeding pipe.

[0010] A mixing channel is vertically provided on one side of the mixing tank. The bottom of the mixing channel is connected to the bottom of the mixing tank, so that the mixed liquid in the mixing channel flows into the bottom of the mixing tank.

[0011] The top of the mixing channel is equipped with a conveying auger, and above the feed end of the conveying auger, a first feed pipe and a feed hopper are arranged in sequence along the conveying direction.

[0012] Furthermore, multiple baffles are provided on the opposite side walls of the mixing channel from top to bottom. The baffles on the two side walls are staggered, and the outer ends of the baffles are raised upwards, so that the baffles are inclined.

[0013] Furthermore, the bottom of the mixing tank is provided with a first feeding pipe, which is connected to the inlet at the bottom of the mixing channel, and a plurality of first nozzles are provided at equal intervals at the upper end of the first feeding pipe.

[0014] Furthermore, the stirring device includes an upper stirring rod and a lower stirring rod mounted on the main pipe.

[0015] Furthermore, the upper stirring rod is fixedly installed on the main pipe, and an active helical gear is fixedly installed on the lower side of the upper stirring rod. A passive helical gear is rotatably installed on the main pipe below the active helical gear through a bearing, and multiple lower stirring rods are installed around the passive helical gear.

[0016] Furthermore, a transmission helical gear is provided between the driving helical gear and the driven helical gear. The transmission helical gear is rotatably mounted on a horizontal rod, and the end of the horizontal rod is fixed to the inner wall of the mixing tank.

[0017] Furthermore, the stirring device is provided in two parts, which are installed on the main pipe in an up-down position.

[0018] Furthermore, a discharge pipe is provided on the upper part of the side wall of the mixing tank.

[0019] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0020] The top of the mixing channel is equipped with a conveying auger. On one hand, the conveying auger transports the salt solution with the magnesium and aluminum sources into the mixing channel to form a mixture. On the other hand, during the rotation of the auger's spiral blades, the mixing channel ensures that the salt solution, magnesium, and aluminum sources are completely fused and reacted, preventing the magnesium and aluminum sources from clumping and causing incomplete reactions. After the salt solution is completely fused with the magnesium and aluminum sources, it enters the mixing tank to be mixed with the alkaline solution, resulting in a good mixing effect and ensuring the purity of the magnesium-aluminum hydrotalcite.

[0021] When the main pipe rotates, it drives the upper stirring rod to rotate. Under the meshing transmission of the active helical gear, the passive helical gear, and the transmission helical gear, the upper and lower stirring rods rotate in opposite directions, thus achieving a good stirring effect.

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0025] In the diagram, 1-tank body, 2-mixing channel, 3-baffle, 4-conveyor auger, 5-feed hopper, 6-first feed pipe, 7-first motor, 8-feed box, 9-main pipe, 10-second feed pipe, 11-upper stirring rod, 12-lower stirring rod, 13-vertical stirring rod, 14-active helical gear, 15-passive helical gear, 16-bearing, 17-transmission helical gear, 18-discharge pipe, 19-first feeding pipe, 191-first nozzle, 20-second feeding pipe, 201-second nozzle, 21-second motor. Detailed Implementation

[0026] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0027] like Figure 1-2 As shown, this utility model provides a mixing device for the production of magnesium aluminum hydrotalcite, including a mixing tank 1, a main pipe 9 rotatably installed in the middle position inside the mixing tank 1, and a stirring device installed on the main pipe 9.

[0028] A second feeding pipe 20 is horizontally fixedly installed at the bottom of the main pipe 9. The inner flow channel of the second feeding pipe 20 is connected to the inner flow channel of the main pipe 9. Multiple second nozzles 201 are provided at the lower end of the second feeding pipe 20. An alkaline solution is introduced into the main pipe 9, and the alkaline solution is sprayed out from the second nozzles 201 of the second feeding pipe 20.

[0029] A mixing channel 2 is vertically provided on one side of the mixing tank 1. The bottom of the mixing channel 2 is connected to the bottom of the mixing tank 1, so that the mixed liquid in the mixing channel 2 flows into the bottom of the mixing tank 1, and the mixed liquid is stirred and mixed with the alkaline solution flowing out from the second feeding pipe 20.

[0030] The top of the mixing channel 2 is equipped with a conveying auger 4, which is driven by a first motor 7.

[0031] Above the feed end of the conveying auger 4, a first feed pipe 6 and a feed hopper 5 are sequentially arranged along the conveying direction. A salt solution is introduced into the first feed pipe 6, and a magnesium source and an aluminum source are placed into the feed hopper 5. The conveying auger 4 conveys the salt solution with the magnesium and aluminum sources to the mixing channel 2 to form a mixture. On the other hand, during the rotation of the spiral blades of the conveying auger 4, the mixing channel 2 ensures that the salt solution and the magnesium and aluminum sources are completely fused and reacted, preventing the magnesium and aluminum sources from clumping and causing incomplete reaction. After the salt solution and the magnesium and aluminum sources are completely fused, they enter the mixing tank 1 to be mixed with the alkaline solution, resulting in more thorough stirring, better mixing effect, and ensuring the purity of the magnesium-aluminum hydrotalcite.

[0032] Multiple baffles 3 are arranged from top to bottom on opposite side walls of the mixing channel 2. The baffles 3 on the two side walls are staggered, and the outer ends of the baffles 3 are curved upwards, making the baffles 3 inclined. The mixed liquid flowing out of the conveying auger 4 falls onto the baffles 3, further dissolving the magnesium source and aluminum source into the salt solution, thus enhancing dissolution and mixing.

[0033] The bottom of the mixing tank 1 is provided with a first feeding pipe 19, which is connected to the inlet at the bottom of the mixing channel 2. The upper end of the first feeding pipe 19 is provided with a plurality of first nozzles 191 at equal intervals, so that the first nozzles 191 and the second nozzles 201 are arranged opposite to each other.

[0034] The stirring device includes multiple upper stirring rods 11 and multiple lower stirring rods 12 mounted on the main pipe 9.

[0035] The upper stirring rod 11 is fixedly installed on the main pipe 9. An active helical gear 14 is fixedly installed on the lower side of the upper stirring rod 11. A passive helical gear 15 is rotatably installed on the main pipe 9 below the active helical gear 14 via a bearing 16. Multiple lower stirring rods 12 are installed around the passive helical gear 15.

[0036] A transmission helical gear 17 is provided between the driving helical gear 14 and the driven helical gear 15. The transmission helical gear 17 is rotatably mounted on a horizontal rod, the end of which is fixed to the inner wall of the mixing tank 1. When the main pipe 9 rotates, it drives the upper stirring rod 11 to rotate. Under the meshing transmission action of the driving helical gear 14, the driven helical gear 15, and the transmission helical gear 17, the upper stirring rod 11 and the lower stirring rod 12 rotate in opposite directions, thereby achieving a good stirring effect.

[0037] Multiple vertical stirring rods 13 are also provided on the upper stirring rod 11 and multiple lower stirring rods 12 to enhance the stirring and mixing effect.

[0038] Furthermore, there are two stirring devices, which are installed vertically on the main pipe 9.

[0039] A discharge pipe 18 is provided on the upper part of the side wall of the mixing tank 1, and the solution after thorough mixing and reaction is discharged from the discharge pipe 18.

[0040] The top of the mixing tank 1 is provided with a top of the main pipe 9, which is rotatably installed in the feed box 8. The inner cavity of the feed box 8 is connected to the inner flow channel of the main pipe 9. A second feed pipe 10 is provided on one side of the feed box 8. A second motor 21 is provided on the top of the feed box 8. The second motor 21 drives the main pipe 9 to rotate.

[0041] The specific working principle of this utility model:

[0042] The salt solution, along with the magnesium and aluminum sources, is added to the conveying auger 4. Under the stirring and conveying action of the conveying auger 4, the mixture enters the mixing channel 2. The mixture in the mixing channel 2 enters the first feeding pipe 19 and flows upward through the first nozzle 191. Meanwhile, the alkaline solution is sprayed out from the second nozzle 201 of the second feeding pipe 20 at the lower end of the main pipe 9. The second feeding pipe 20 rotates with the main pipe 9, thereby allowing the alkaline solution to fully mix and react with the mixture of salt solution, magnesium source, and aluminum source. The solutions are all sprayed from the bottom of the mixing tank 1, so the solutions flow from bottom to top. After being fully stirred by the stirring device, the solutions are discharged from the discharge pipe 18.

[0043] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A mixing device for producing magnesium-aluminum hydrotalcite, characterized by: It includes a mixing tank (1), a main pipe (9) is rotatably installed at an intermediate position in the mixing tank (1), and a stirring device is installed on the main pipe (9); A second feeding pipe (20) is horizontally and fixedly installed at the bottom of the main pipe (9), an inner flow channel of the second feeding pipe (20) is communicated with an inner flow channel of the main pipe (9), and a plurality of second nozzles (201) are arranged at the lower end of the second feeding pipe (20); A mixing channel (2) is vertically arranged at one side of the mixing tank (1), and the bottom of the mixing channel (2) is communicated with the bottom of the mixing tank (1), so that the mixed liquid in the mixing channel (2) flows into the bottom of the mixing tank (1); A conveying auger (4) is arranged at the top of the mixing channel (2), and a first feeding pipe (6) and a feeding hopper (5) are sequentially arranged above the feeding end of the conveying auger (4) along the conveying direction.

2. A mixing device for producing magnesium-aluminum hydrotalcite according to claim 1, characterized in that: A plurality of baffles (3) are arranged on the opposite two side walls of the mixing channel (2) from top to bottom, the baffles (3) on the two side walls are staggered, and the outer end of the baffle (3) is upwardly tilted, so that the baffle (3) is obliquely arranged.

3. A mixing device for producing magnesium-aluminum hydrotalcite according to claim 1, characterized in that: A first feeding pipe (19) is arranged at the bottom of the mixing tank (1), the first feeding pipe (19) is connected with the feeding port at the bottom of the mixing channel (2), and a plurality of first nozzles (191) are equidistantly arranged at the upper end of the first feeding pipe (19).

4. A mixing device for producing magnesium-aluminum hydrotalcite according to claim 1, characterized in that: The stirring device includes a plurality of upper stirring rods (11) and a plurality of lower stirring rods (12) installed on the main pipe (9).

5. A mixing device for producing magnesium-aluminum hydrotalcite according to claim 4, characterized in that: The upper stirring rod (11) is fixedly installed on the main pipe (9), the lower side of the upper stirring rod (11) is fixedly installed with a driving helical gear (14), the lower side of the main pipe (9) is rotatably installed with a driven helical gear (15) through a bearing (16), and a plurality of lower stirring rods (12) are installed on one circle of the driven helical gear (15).

6. A mixing device for producing magnesium-aluminum hydrotalcite according to claim 5, characterized in that: A transmission helical gear (17) is arranged between the driving helical gear (14) and the driven helical gear (15), the transmission helical gear (17) is rotatably installed on a horizontal rod, and the end of the horizontal rod is fixedly installed on the inner wall of the mixing tank (1).

7. A mixing device for producing magnesium-aluminum hydrotalcite according to claim 6, characterized in that: The stirring device is provided with two, and the two stirring devices are installed on the main pipe (9) in an up-down position.

8. A mixing device for producing magnesium-aluminum hydrotalcite according to claim 1, characterized in that: A discharge pipe (18) is arranged at the upper position of the side wall of the mixing tank (1).

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