Steady-state cascade reaction tank suitable for potassium fluosilicate production

Abstract

The utility model relates to the technical field of potassium fluosilicate processing, in particular to a steady-state cascade reaction tank suitable for potassium fluosilicate production, which comprises a first reaction tank and a second reaction tank, an upper communicating pipe and a lower communicating pipe are connected between the first reaction tank and the second reaction tank, a first double-layer stirring device is mounted in the first reaction tank, and a second double-layer stirring device is mounted in the second reaction tank. A second double-layer stirring device is mounted in the second reaction tank, and the second reaction tank is connected with a slurry pump through a slurry communicating pipe. According to the steady-state cascade reaction tank suitable for potassium fluosilicate production, effective nucleation and growth of potassium fluosilicate crystals are realized through a unique double-layer stirring device design. The stirring device in the reaction tank 1 promotes rapid mixing of slurry and increases ion collision opportunities, so that formation of crystal nucleuses is accelerated. And a stirring device in the reaction tank 2 further promotes uniform dispersion and growth of crystal nucleuses, so that the particle size of the final product potassium fluosilicate is obviously increased.

Description

Technical Field

[0001] The utility model relates to the technical field of potassium fluorosilicate processing, and specifically, to a steady-state cascade reaction tank applicable to the production of potassium fluorosilicate. Background Technique

[0002] Potassium fluorosilicate is a white fine powder or crystal, odorless, tasteless, toxic, slightly acidic, and hygroscopic. It is slightly soluble in water, hydrolyzes in hot water to form potassium fluoride and fluosilicic acid, is insoluble in alcohol and liquid ammonia, soluble in hydrochloric acid, and the solubility slightly increases with the increase of temperature. It is mainly used for wood anti-corrosion, ceramic manufacturing, aluminum and magnesium smelting, optical glass manufacturing, synthetic mica and potassium fluorochlorate manufacturing, etc.

[0003] At present, the preparation of potassium fluorosilicate mostly uses potassium carbonate or potassium hydroxide as raw materials to neutralize fluosilicic acid. Most of the fluosilicic acid by-produced by phosphoric chemical or hydrofluoric acid production enterprises reacts with waste potassium chloride or potassium sulfate generated in the organic fluorination process to form potassium fluorosilicate precipitate, and the potassium fluorosilicate product is obtained through filtration, washing, and drying.

[0004] During the reaction process of potassium fluorosilicate, the particle size of the product crystallization is particularly important, especially for filtration. When the particle size of potassium fluorosilicate is small, some potassium fluorosilicate will pass through the filter and enter the filtrate storage tank with the filtrate, resulting in a decrease in the yield of potassium fluorosilicate. At the same time, because the state of potassium fluorosilicate itself in the solution is similar to a sludge state, small particle size not only affects the filtration speed but also increases the water content in the filter cake, leading to an increase in the subsequent drying cost. Therefore, it is particularly important to increase the particle size of potassium fluorosilicate. Content of the Utility Model

[0005] The purpose of the utility model is to provide a steady-state cascade reaction tank applicable to the production of potassium fluorosilicate to solve the problem proposed in the above background technique that during the reaction process of potassium fluorosilicate, the particle size of the product crystallization is particularly important, especially when the crystallization particle size is small, it not only has a great impact on filtration, is prone to the phenomenon of filter penetration, resulting in a decrease in the yield of potassium fluorosilicate, but also because the state of potassium fluorosilicate itself in the solution is similar to a sludge state, small particle size not only affects the filtration speed but also increases the water content in the filter cake, leading to an increase in the subsequent drying cost.

[0006] To achieve the above purpose, the utility model provides a steady-state cascade reaction tank applicable to the production of potassium fluorosilicate, which includes a first reaction tank and a second reaction tank. An upper connecting pipe and a lower connecting pipe are connected between the first reaction tank and the second reaction tank. A first double-layer stirring device is installed inside the first reaction tank, a second double-layer stirring device is installed inside the second reaction tank. The second reaction tank is connected to a slurry pump through a slurry connecting pipe. The top parts of the first reaction tank and the second reaction tank are respectively connected to a first feed pipe and a second feed pipe.

[0007] Preferably, a first valve is installed on the upper connecting pipe, and a second valve is installed on the lower connecting pipe.

[0008] Preferably, both the first double-layer stirring device and the second double-layer stirring device are designed with double-layer blades. The inclination angles of the blades in each layer are different, and the directions of the blades are opposite, so as to realize the nucleation and crystal growth of potassium fluorosilicate.

[0009] Preferably, heating jackets are provided on the side walls of the first reaction tank and the second reaction tank, and steam or hot water is introduced into the jackets for heating.

[0010] Preferably, a first upper blade and a first lower blade are installed on the stirring shaft of the first double-layer stirring device, and a second upper blade and a second lower blade are installed on the stirring shaft of the second double-layer stirring device.

[0011] Preferably, the inclination directions of the first upper blade and the first lower blade are opposite, the inclination directions of the first upper blade and the second lower blade are the same, the inclination directions of the first lower blade and the second upper blade are the same, and the acute angle between the first upper blade and the stirring shaft is 60°-75°.

[0012] Preferably, the first upper blade includes two blades, and the two blades are flipped 45° in different directions along their respective central axes.

[0013] Preferably, the heights of both ends of the lower connecting pipe are lower than the heights of the first lower blade and the second lower blade, and the heights of both ends of the upper connecting pipe are higher than the heights of the first upper blade and the second upper blade.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] In the steady-state cascade reaction tank applicable to the production of potassium fluorosilicate, through the unique design of the double-layer stirring device, the effective nucleation and growth of potassium fluorosilicate crystals are realized. The stirring device in the first reaction tank promotes the rapid mixing of the slurry, increases the ion collision opportunity, and thus accelerates the formation of crystal nuclei. The stirring device in the second reaction tank further promotes the uniform dispersion and growth of crystal nuclei, making the particle size of the final product potassium fluorosilicate increase significantly. Due to the increase in particle size, the phenomenon of breakthrough filtration of potassium fluorosilicate during the filtration process is effectively inhibited, reducing the loss of the product in the filtrate, thereby improving the overall yield of potassium fluorosilicate. The large-particle-size potassium fluorosilicate particles improve the filtration efficiency, not only accelerating the filtration speed but also reducing the water content in the filter cake, lightening the burden on the subsequent drying process and improving the overall production efficiency.

[0016] By increasing the particle size and yield of potassium fluorosilicate, as well as accelerating the filtration speed and reducing the water content of the filter cake, the utility model indirectly reduces the drying cost and other processing costs, thereby achieving an overall reduction in production costs. The design of the steady-state cascade reaction tank ensures the continuity and stability of the reaction process, reduces the impact of operation fluctuations on product quality, and improves the uniformity and reliability of the product. The reaction tank system adopts a modular design, which is convenient for expansion or adjustment according to production needs, and improves the flexibility and adaptability of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 is a schematic diagram of the structure of the stirring device in the utility model;

[0019] Figure 3 is a schematic diagram of the structure of the paddle in the utility model;

[0020] The meanings of the various reference numerals in the figure are as follows:

[0021] 1, the first reaction tank; 11, the first double-layer stirring device; 111, the first upper paddle; 112, the first lower paddle; 12, the first feed pipe; 13, the second feed pipe; 2, the second reaction tank; 21, the second double-layer stirring device; 211, the second upper paddle; 212, the second lower paddle; 3, the upper connecting pipe; 4, the lower connecting pipe; 5, the slurry connecting pipe; 6, the first valve; 7, the second valve; 8, the slurry pump; 11, the second double-layer stirring device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] The present utility model provides a steady-state cascade reaction tank suitable for the production of potassium fluorosilicate, as Figures 1-3 shown, including a first reaction tank 1 and a second reaction tank 2. An upper connecting pipe 3 and a lower connecting pipe 4 are connected between the first reaction tank 1 and the second reaction tank 2. A first double-layer stirring device 11 is installed inside the first reaction tank 1, a second double-layer stirring device 21 is installed inside the second reaction tank 2. The second reaction tank 2 is connected to a slurry pump 8 through a slurry connecting pipe 5. The tops of the first reaction tank 1 and the second reaction tank 2 are respectively connected to a first feed pipe 12 and a second feed pipe 13.

[0024] In this embodiment, a first valve 6 is installed on the upper connecting pipe 3, and a second valve 7 is installed on the lower connecting pipe 4.

[0025] Specifically, both the first double-layer stirring device 11 and the second double-layer stirring device 21 are designed with double-layer blades. The inclination angles of each layer of blades are different, and the directions of the blades are opposite, which are used to achieve the nucleation and crystal growth of potassium fluorosilicate.

[0026] Furthermore, the interiors of the first reaction tank 1 and the second reaction tank 2 adopt a jacket heating method, and steam or water is introduced into the interlayer for heating.

[0027] Furthermore, a first upper blade 111 and a first lower blade 112 are installed on the stirring shaft of the first double-layer stirring device 11, and a second upper blade 211 and a second lower blade 212 are installed on the stirring shaft of the second double-layer stirring device 21.

[0028] Furthermore, the inclination directions of the first upper blade 111 and the first lower blade 112 are opposite, the inclination directions of the first upper blade 111 and the second lower blade 212 are the same, the inclination directions of the first lower blade 112 and the second upper blade 211 are the same, and the acute angle between the first upper blade 111 and the stirring shaft is 60° - 75°. Specifically, the first upper blade 111 and the second lower blade 212 are inclined upward, and the perpendicular angle with the stirring shaft is 105° - 120°. The first lower blade 112 and the second upper blade 211 are inclined downward, and the perpendicular angle with the stirring shaft is 60° - 75°.

[0029] Furthermore, each blade has two vanes. The two vanes are flipped 45° in different directions along their respective central axes. For example, the first upper blade 111 includes two vanes. One vane rotates counterclockwise 45° along its central axis, and the other vane rotates clockwise 45° along its central axis. The flipping directions of the vanes on the same side of the first upper blade 111 and the first lower blade 112 are exactly opposite. Such a blade setting can make the slurry mix more evenly after stirring.

[0030] Furthermore, the heights of both ends of the lower connecting pipe 4 are lower than the heights of the first lower blade 112 and the second lower blade 212, and the heights of both ends of the upper connecting pipe 3 are higher than the heights of the first upper blade 111 and the second upper blade 211.

[0031] When the steady-state cascade reaction tank applicable to the production of potassium fluorosilicate of the present utility model is in use, first close the first valve 6 and the second valve 7, then open the jacket in the first reaction tank 1 to heat up, and at the same time add the slurry through the first feed pipe 12 and the second feed pipe 13. When the slurry level reaches the position of the first lower paddle 112 of the first double-layer stirring device 11, start the stirring device. As the slurry level continues to rise until it reaches the height of the upper connecting pipe 3, at this time open the first valve 6 and start the heating device in the second reaction tank 2 to make the slurry overflow into the second reaction tank 2. When the slurry reaches the position of the second lower paddle 212 of the second double-layer stirring device 21 in the second reaction tank 2, turn on the second double-layer stirring device 21. After the slurry level continues to rise to the position of the second upper paddle 211, open the second valve 7 at the lower connecting pipe 4 to make the slurry inside the two series-connected reaction tanks start to circulate. At the same time, adjust the conveying frequency of the slurry pump 8 to convey the slurry to the filtration section to ensure that the output frequency of the system matches the feeding frequency and reaches the balanced state of the system.

[0032] In this process, the key of the steady-state cascade reaction tank lies in the stirring device configured with double-layer paddles and opposite paddle rotation directions. This design not only prolongs the residence time of the materials in the reaction tank, which is beneficial to the increase of the particle size of potassium fluorosilicate crystals; moreover, the relative design of the paddles in the first reaction tank 1 increases the collision chance between ions in the slurry and improves the yield of potassium fluorosilicate. In the second reaction tank 2, the second upper paddle 211 drives the slurry upward to evenly disperse the slurry, increasing the contact chance between crystal nuclei and being beneficial to the uniform growth of potassium fluorosilicate crystals; while the second lower paddle 212 presses the slurry downward to make the slurry return to the first reaction tank 1 through the lower connecting pipe 4, realizing the circulation of the slurry between the two reaction tanks. This circulation process not only increases the number of potassium fluorosilicate crystal seeds, but also is beneficial to the crystal cultivation process of potassium fluorosilicate, creating favorable conditions for the subsequent filtration link.

[0033] During the process, the steady-state cascade reaction tank must be configured with a stirring device with double-layer paddles and opposite paddles. This not only increases the residence time of the materials in the reaction tank and promotes the increase of the particle size of potassium fluorosilicate crystals, but also the relative paddle design in the reaction tank 1 can increase the collision probability between ions in the slurry and improve the yield of potassium fluorosilicate. The upper paddle of the stirring device in the reaction tank 2 drives the slurry upward to evenly disperse the slurry, increasing the contact chance between crystal nuclei and promoting the uniform growth of potassium fluorosilicate crystals. The lower paddle presses the slurry downward to make the slurry return to the reaction tank 1 through the lower connecting pipe, realizing the circulation of the slurry between the two tanks. At the same time, it increases the number of potassium fluorosilicate crystal seeds, can better realize the crystal cultivation process of potassium fluorosilicate, and is beneficial to the subsequent filtration link.

[0034] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A steady-state cascade reaction tank applicable to the production of potassium fluorosilicate, characterized in that: It includes a first reaction tank (1) and a second reaction tank (2). An upper connecting pipe (3) and a lower connecting pipe (4) are connected between the first reaction tank (1) and the second reaction tank (2). A first double-layer stirring device (11) is installed inside the first reaction tank (1), and a second double-layer stirring device (21) is installed inside the second reaction tank (2). The second reaction tank (2) is connected to a slurry pump (8) through a slurry connecting pipe (5). The tops of the first reaction tank (1) and the second reaction tank (2) are respectively connected to a first feed pipe (12) and a second feed pipe (13).

2. The steady-state cascade reaction tank applicable to the production of potassium fluorosilicate according to claim 1, characterized in that: A first valve (6) is installed on the upper connecting pipe (3), and a second valve (7) is installed on the lower connecting pipe (4).

3. The steady-state cascade reaction tank applicable to the production of potassium fluorosilicate according to claim 1, characterized in that: Both the first double-layer stirring device (11) and the second double-layer stirring device (21) are designed with double-layer blades. The inclination angles of each layer of blades are different, and the blade directions are opposite, which are used to realize the nucleation and crystal growth of potassium fluorosilicate.

4. The steady-state cascade reaction tank applicable to the production of potassium fluorosilicate according to claim 1, characterized in that: Heating jackets are provided on the side walls of the first reaction tank (1) and the second reaction tank (2), and steam or hot water is introduced into the jackets for heating.

5. The steady-state cascade reaction tank applicable to the production of potassium fluorosilicate according to claim 1, characterized in that: A first upper blade (111) and a first lower blade (112) are installed on the stirring shaft of the first double-layer stirring device (11), and a second upper blade (211) and a second lower blade (212) are installed on the stirring shaft of the second double-layer stirring device (21).

6. The steady-state cascade reaction tank applicable to the production of potassium fluorosilicate according to claim 5, wherein: The inclination directions of the first upper blade (111) and the first lower blade (112) are opposite. The inclination directions of the first upper blade (111) and the second lower blade (212) are the same. The inclination directions of the first lower blade (112) and the second upper blade (211) are the same. The acute angle between the first upper blade (111) and the stirring shaft is 60° - 75°.

7. The steady-state cascade reaction tank applicable to the production of potassium fluorosilicate according to claim 5, characterized in that: The first upper blade (111) includes two blades, and the two blades are flipped 45° in different directions along their respective central axes.

8. The steady-state cascade reaction tank applicable to the production of potassium fluorosilicate according to claim 5, characterized in that: The heights of both ends of the lower connecting pipe (4) are lower than the heights of the first lower blade (112) and the second lower blade (212). The heights of both ends of the upper connecting pipe (3) are higher than the heights of the first upper blade (111) and the second upper blade (211).

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