High-temperature crystallization device for preparing high-purity sodium carbonate

Abstract

The utility model relates to the technical field of sodium carbonate production, and discloses a high-temperature crystallization device for preparing high-purity sodium carbonate, which comprises a crystallization tank, a first motor is fixedly arranged at the top of the crystallization tank, the output end of the first motor is fixedly connected with a transmission rod, the transmission rod is fixedly connected with a first stirring blade, and the first stirring blade is fixedly connected with a second stirring blade. A transmission rod is arranged in the crystallizing tank, a scraper is fixedly connected to the transmission rod, a heating tank is arranged in the crystallizing tank, a temperature adjusting pipe is arranged on the heating tank, and a pretreatment tank is fixedly connected to one end of a communicating pipe. During use, in the pretreatment tank, the temperature in the pretreatment tank is increased and the dissolution of heavy ash is accelerated through the heating assembly, and in the heating tank, the filtrate is uniformly heated through the rotation of the first stirring blade, so that the phenomenon of local overheating or non-uniform heating is avoided, the crystallization speed and quality are improved, and the improvement of the production efficiency is facilitated; materials attached to the inner wall of the heating tank are scraped through the scraping plate, waste is reduced, and the production cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium carbonate production, in particular to a high-temperature crystallization device for preparing high-purity sodium carbonate. Background Art

[0002] Sodium carbonate, commonly known as soda ash or soda, has seen a gradual increase in market demand for high-purity sodium carbonate in recent years, along with the rapid development of the electronics industry, new energy, and pharmaceutical industries at home and abroad. The market prospects are promising. Among the current technologies for preparing high-purity sodium carbonate, there are two methods: one is to prepare high-purity sodium carbonate by filtering through ceramic membrane filters, which has high equipment operation and maintenance costs; the other is to prepare high-purity sodium carbonate products through oxidation and impurity removal processes, such as filtering, washing, drying, and decomposition. The process is relatively complicated. In the preparation process of sodium carbonate, high-temperature crystallization is a key step in purifying and obtaining high-purity sodium carbonate.

[0003] However, when preparing high-purity sodium carbonate, the existing high-temperature crystallization device has the problem of uneven heating during operation. The temperature in some areas is too high, which may cause side reactions or agglomeration, while the temperature is too low, which is not conducive to crystal growth and slows down the crystallization rate. It is easy to produce sodium carbonate decahydrate, which affects the crystallization quality and production efficiency of the product. Therefore, a high-temperature crystallization device for preparing high-purity sodium carbonate is proposed. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a high-temperature crystallization device for preparing high-purity sodium carbonate.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high-temperature crystallization device for preparing high-purity sodium carbonate, comprising a crystallization tank, a first motor is fixedly installed on the top of the crystallization tank, a transmission rod is fixedly connected to the output end of the first motor, a first stirring blade is fixedly connected to the transmission rod, a scraper is fixedly connected to the transmission rod, a heating tank is provided in the crystallization tank, the scraper is attached to the inner wall of the heating tank, a temperature regulating tube is provided on the heating tank, a first liquid pump is fixedly installed on the outside of the crystallization tank, a PE filter is fixedly connected to the input end of the first liquid pump, a connecting pipe is fixedly connected to the PE filter, a first regulating valve is provided on the connecting pipe, and a pretreatment tank is fixedly connected to one end of the connecting pipe.

[0006] As a further description of the above technical solution:

[0007] A second motor is fixedly installed on the top of the pretreatment tank, and a second stirring blade is fixedly connected to the output end of the second motor. A heating component is provided in the pretreatment tank, a feed port is fixedly connected to one side of the pretreatment tank, a water inlet is fixedly connected to the other side of the pretreatment tank, and a feed port is fixedly connected to the top of the pretreatment tank.

[0008] As a further description of the above technical solution:

[0009] A feed pipe is fixedly connected to one side of the crystallization tank, a second liquid pump is fixedly installed on the feed pipe, a centrifuge is fixedly connected to the output end of the second liquid pump, a filling port is fixedly connected to the top of the centrifuge, a first feed pipe is fixedly connected to the centrifuge, and a second regulating valve is provided on the first feed pipe.

[0010] As a further description of the above technical solution:

[0011] A first spiral pusher is fixedly connected to the first feed pipe, a heavy ash calcining furnace is fixedly connected to one side of the first spiral pusher, a second feed pipe is fixedly connected to the side of the heavy ash calcining furnace away from the first spiral pusher, a third regulating valve is provided on the second feed pipe, a second spiral pusher is fixedly connected to the second feed pipe, and a cooling alkali machine is fixedly connected to one side of the second spiral pusher.

[0012] As a further description of the above technical solution:

[0013] The transmission rod, the first stirring blades and the scraper are all rotated in the heating tank. The first stirring blades are provided in four groups and are evenly distributed on the transmission rod. The scraper is provided in two groups and is symmetrically distributed on the transmission rod.

[0014] As a further description of the above technical solution:

[0015] The temperature regulating tube is located in the cavity between the crystallization tank and the heating tank, the temperature regulating tube is attached to the outer wall of the heating tank, and a heating wire is arranged in the temperature regulating tube.

[0016] As a further description of the above technical solution:

[0017] The feed pipe is located on a side of the crystallization tank away from the first liquid pump, and the first feed pipe is located on a side of the centrifuge away from the feed pipe.

[0018] The utility model has the following beneficial effects:

[0019] 1. In the utility model, when the high-temperature crystallization device for preparing high-purity sodium carbonate is used, in the pretreatment tank, the temperature in the pretreatment tank is increased by a heating component to accelerate the dissolution of heavy ash. In the heating tank, the filtrate is heated evenly by the rotation of the first stirring blade, thereby avoiding local overheating or uneven heating, improving the crystallization speed and quality, and facilitating the improvement of production efficiency. The material attached to the inner wall of the heating tank is scraped off by a scraper to reduce waste and effectively reduce production costs.

[0020] 2. In the utility model, when the high-temperature crystallization device for preparing high-purity sodium carbonate is used, recrystallization is carried out under high-temperature conditions by setting a temperature regulating tube, so that sodium carbonate monohydrate with high purity and low impurity content can be prepared, and high-purity sodium carbonate can be prepared by calcining, thereby avoiding low-temperature recrystallization to produce sodium carbonate decahydrate, thereby reducing the energy consumption of the drying process and reducing the production cost. The mother liquor filtrate can be sent to the neutralization water tank for soda ash production, without waste liquid discharge, thereby improving the environmental protection of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of a high-temperature crystallization device for preparing high-purity sodium carbonate proposed in the utility model;

[0022] Figure 2 This is a partial structural section of a high-temperature crystallization device for preparing high-purity sodium carbonate proposed in the utility model. Figure 1 ;

[0023] Figure 3 This is a partial structural section of a high-temperature crystallization device for preparing high-purity sodium carbonate proposed in the utility model. Figure 2 ;

[0024] Figure 4 This is a partial structural section of a high-temperature crystallization device for preparing high-purity sodium carbonate proposed in the utility model. Figure 3 .

[0025] Legend:

[0026] 1. Crystallization tank; 2. First motor; 3. Transmission rod; 4. First stirring blade; 5. Scraper; 6. Heating tank; 7. Temperature regulating tube; 8. First liquid pump; 9. PE filter; 10. Connecting tube; 11. First regulating valve; 12. Pretreatment tank; 13. Second motor; 14. Second stirring blade; 15. Heating assembly; 16. Feed inlet; 17. Water inlet; 18. Feed inlet; 19. Feed pipe; 20. Second liquid pump; 21. Centrifuge; 22. Filling port; 23. First feeding pipe; 24. Second regulating valve; 25. First spiral pusher; 26. Heavy ash calcining furnace; 27. Second feeding pipe; 28. Third regulating valve; 29. ​​Second spiral pusher; 30. Alkali cooling machine. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Reference Figure 1-Figure 4 The utility model provides an embodiment: a high-temperature crystallization device for preparing high-purity sodium carbonate, comprising a crystallization tank 1, a first motor 2 is fixedly installed on the top of the crystallization tank 1, a transmission rod 3 is fixedly connected to the output end of the first motor 2, a first stirring blade 4 is fixedly connected to the transmission rod 3, a scraper 5 is fixedly connected to the transmission rod 3, a heating tank 6 is arranged in the crystallization tank 1, the scraper 5 is attached to the inner wall of the heating tank 6, a temperature regulating tube 7 is arranged on the heating tank 6, a first liquid pump 8 is fixedly installed on the outer side of the crystallization tank 1, a PE filter 9 is fixedly connected to the input end of the first liquid pump 8, a connecting pipe 10 is fixedly connected to the PE filter 9, a first regulating valve 11 is arranged on the connecting pipe 10, a pretreatment tank 12 is fixedly connected to one end of the connecting pipe 10, and the temperature regulating tube 7 is started. The heating wire inside is used to heat the heating tank 6, and the temperature is controlled to be 90-95℃ for crystallization. At the same time, the first motor 2 is started, and the first motor 2 drives the first stirring blade 4 to rotate through the transmission rod 3. The filtrate in the heating tank 6 is stirred by the rotation of the first stirring blade 4, so that the filtrate is heated evenly, avoiding local overheating or uneven heating, improving the crystallization speed and quality, and being conducive to promoting the improvement of production efficiency. Monohydrate alkali slurry can be obtained under high temperature conditions, avoiding low-temperature recrystallization to produce decahydrate sodium carbonate, thereby reducing the energy consumption of the drying process. When the transmission rod 3 rotates, the scraper 5 is also driven to rotate, so that the monohydrate alkali slurry attached to the inner wall of the heating tank 6 can be scraped clean, reducing waste and effectively reducing production costs.

[0029] In addition, a second motor 13 is fixedly installed on the top of the pretreatment tank 12, and a second stirring blade 14 is fixedly connected to the output end of the second motor 13. A heating component 15 is provided in the pretreatment tank 12. A feed port 16 is fixedly connected to one side of the pretreatment tank 12, and a water inlet 17 is fixedly connected to the other side of the pretreatment tank 12. A feed port 18 is fixedly connected to the top of the pretreatment tank 12. The operator adds a certain amount of desalted water to the pretreatment tank 12 through the feed port 16, and then feeds high-quality liquid phase heavy ash into the pretreatment tank 12 through the feed port 18. The second motor 13 is started, and the second motor 13 drives the second stirring blade 14 to rotate. The rotation of the second stirring blade 14 is used for stirring. At the same time, the heating component 15 is started to accelerate the dissolution of the heavy ash. The saturated solution of soda ash is prepared by hot stirring and dissolving. After the heavy ash is completely dissolved, the pretreatment agent is added through the water inlet 17, and then the stirring reaction is continued for a period of time. After that, the first regulating valve 11 is opened to allow the saturated solution of soda ash to enter the PE filter 9 for filtration. A feeding pipe 19 is fixedly connected to one side of the crystallizer 1, and a second liquid pump 20 is fixedly installed on the feeding pipe 19. A centrifuge 21 is fixedly connected to the output end of the second liquid pump 20. A filling port 22 is fixedly connected to the top of the centrifuge 21. A first feeding pipe 23 is fixedly connected to the centrifuge 21. A second regulating valve 24 is provided on the first feeding pipe 23. A saturated sodium carbonate solution is added to the centrifuge 21 through the filling port 22 to wash the material. The filtrate and washing liquid can then be sent to the neutralization tank for soda ash production. The first feeding pipe 23 is fixedly connected with a first screw pusher 25, one side of the first screw pusher 25 is fixedly connected with a heavy ash calcining furnace 26, the side of the heavy ash calcining furnace 26 away from the first screw pusher 25 is fixedly connected with a second feeding pipe 27, the second feeding pipe 27 is provided with a third regulating valve 28, the second feeding pipe 27 is fixedly connected with a second screw pusher 29, one side of the second screw pusher 29 is fixedly connected with a cooling alkali machine 30, the second regulating valve 24 is opened to allow the washed material to be sent into the heavy ash calcining furnace 26 through the first screw pusher 25, the monohydrate is converted into sodium carbonate through steam heating, and then the third regulating valve 28 is opened to allow the material to be sent into the second screw pusher 29 through the second screw pusher 29. In the cooling alkali machine 30, a high-purity sodium carbonate product is obtained after cooling, and the above steps can be repeated to perform secondary recrystallization on the product. The centrifuge 21, the heavy ash calcining furnace 26, and the cooling alkali machine 30 are all prior arts, and their working principles and circuit structure diagrams are known and open to technicians in the field, so they are not elaborated in detail. The transmission rod 3, the first stirring blade 4, and the scraper 5 all rotate in the heating tank 6. The first stirring blade 4 is provided with four groups and is evenly distributed on the transmission rod 3. The scraper 5 is provided with two groups and is symmetrically distributed on the transmission rod 3. The temperature regulating tube 7 is located in the cavity between the crystallization tank 1 and the heating tank 6. The temperature regulating tube 7 is attached to the outer wall of the heating tank 6. A heating wire is provided in the temperature regulating tube 7. The feeding pipe 19 is located on the side of the crystallization tank 1 away from the first liquid pump 8.The first feed pipe 23 is located on the side of the centrifuge 21 away from the feed pipe 19.

[0030] Working principle: When using the high-temperature crystallization device for preparing high-purity sodium carbonate, the operator adds a certain amount of desalted water to the pretreatment tank 12 through the feed port 16, and then feeds the high-quality liquid phase heavy ash into the pretreatment tank 12 through the feed port 18, starts the second motor 13, and the second motor 13 drives the second stirring blade 14 to rotate, and stirs by the rotation of the second stirring blade 14, and starts the heating component 15 at the same time, which can accelerate the dissolution of the heavy ash, and prepares a saturated solution of soda ash by heating, stirring and dissolving. After the heavy ash is completely dissolved, the pretreatment agent is added through the water inlet 17, and then the stirring reaction is continued for a period of time, and then the first regulating valve 11 is opened to allow the saturated solution of soda ash to enter the PE filter 9 for filtration, and then the first liquid pump 8 is started to send the filtrate into the heating tank 6, and then the heating wire in the thermostatic tube 7 is started, and the heating tank 6 is heated by the heating wire to control the temperature to 90-95°C for crystallization, and the first motor 2 is started at the same time, and the first motor 2 drives the first stirring blade 4 to rotate through the transmission rod 3, The filtrate in the heating tank 6 is stirred by the rotation of the first stirring blade 4, so that the filtrate is heated evenly, which can accelerate the crystallization speed. Under high temperature conditions, monohydrate slurry can be obtained, avoiding the production of sodium carbonate decahydrate by low-temperature recrystallization. The transmission rod 3 rotates while driving the scraper 5 to rotate, so that the monohydrate slurry attached to the inner wall of the heating tank 6 can be scraped clean to reduce waste. Then the second liquid pump 20 is started, and the obtained monohydrate slurry is sent to the centrifuge 21 through the feeding pipe 19 for centrifugation. Saturated sodium carbonate solution is added to the centrifuge 21 through the filling port 22 to wash the material. The filtrate and washing liquid can be sent to the neutralization tank for soda ash production. The second regulating valve 24 is opened so that the washed material is sent to the heavy ash calcining furnace 26 through the first spiral pusher 25. The monohydrate is converted into sodium carbonate through steam heating. Then the third regulating valve 28 is opened and sent to the cooling alkali machine 30 through the second spiral pusher 29. After cooling, a high-purity sodium carbonate product is obtained. The above steps can be repeated to perform secondary recrystallization on the product.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-temperature crystallization device for preparing high-purity sodium carbonate, comprising a crystallization tank (1), characterized in that: A first motor (2) is fixedly mounted on the top of the crystallization tank (1); a transmission rod (3) is fixedly connected to the output end of the first motor (2); a first stirring blade (4) is fixedly connected to the transmission rod (3); a scraper (5) is fixedly connected to the transmission rod (3); a heating tank (6) is provided inside the crystallization tank (1); the scraper (5) is attached to the inner wall of the heating tank (6); a temperature regulating tube (7) is provided on the heating tank (6); a first liquid pump (8) is fixedly mounted on the outer side of the crystallization tank (1); a PE filter (9) is fixedly connected to the input end of the first liquid pump (8); a connecting pipe (10) is fixedly connected to the PE filter (9); a first regulating valve (11) is provided on the connecting pipe (10); and a pretreatment tank (12) is fixedly connected to one end of the connecting pipe (10).

2. A high-temperature crystallization device for preparing high-purity sodium carbonate according to claim 1, characterized in that: A second motor (13) is fixedly mounted on the top of the pretreatment tank (12); a second stirring blade (14) is fixedly connected to the output end of the second motor (13); a heating component (15) is provided inside the pretreatment tank (12); a feed port (16) is fixedly connected to one side of the pretreatment tank (12); a water inlet (17) is fixedly connected to the other side of the pretreatment tank (12); and a feed port (18) is fixedly connected to the top of the pretreatment tank (12).

3. A high-temperature crystallization device for preparing high-purity sodium carbonate according to claim 2, characterized in that: A feed pipe (19) is fixedly connected to one side of the crystallization tank (1), a second liquid pump (20) is fixedly installed on the feed pipe (19), a centrifuge (21) is fixedly connected to the output end of the second liquid pump (20), a filling port (22) is fixedly connected to the top of the centrifuge (21), a first feed pipe (23) is fixedly connected to the centrifuge (21), and a second regulating valve (24) is provided on the first feed pipe (23).

4. A high-temperature crystallization device for preparing high-purity sodium carbonate according to claim 3, characterized in that: The first feed pipe (23) is fixedly connected to a first spiral pusher (25), one side of the first spiral pusher (25) is fixedly connected to a heavy ash calcining furnace (26), a second feed pipe (27) is fixedly connected to a side of the heavy ash calcining furnace (26) away from the first spiral pusher (25), a third regulating valve (28) is provided on the second feed pipe (27), a second spiral pusher (29) is fixedly connected to the second feed pipe (27), and one side of the second spiral pusher (29) is fixedly connected to a cooling alkali machine (30).

5. A high-temperature crystallization device for preparing high-purity sodium carbonate according to claim 4, characterized in that: The transmission rod (3), the first stirring blades (4) and the scraper (5) all rotate in the heating tank (6); the first stirring blades (4) are provided in four groups and are evenly distributed on the transmission rod (3); the scraper (5) are provided in two groups and are symmetrically distributed on the transmission rod (3).

6. A high-temperature crystallization device for preparing high-purity sodium carbonate according to claim 5, characterized in that: The temperature regulating tube (7) is located in the cavity between the crystallization tank (1) and the heating tank (6), the temperature regulating tube (7) is attached to the outer wall of the heating tank (6), and a heating wire is arranged in the temperature regulating tube (7).

7. A high-temperature crystallization device for preparing high-purity sodium carbonate according to claim 6, characterized in that: The feed pipe (19) is located on a side of the crystallization tank (1) away from the first liquid pump (8), and the first delivery pipe (23) is located on a side of the centrifuge (21) away from the feed pipe (19).

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