Automatic selenium production equipment

Abstract

The utility model relates to the technical field of selenium dioxide preparation, and discloses automatic selenium production equipment which comprises a reaction chamber used for generating gas containing selenium dioxide and a cooling unit connected with the reaction chamber, the cooling unit comprises a crystallizing tank and a scraping module arranged in the crystallizing tank, and an exhaust port and a discharge port are formed in the crystallizing tank; the gas exchanges heat in the crystallizing tank through the side wall of the crystallizing tank to be cooled and crystallized; and the scraping module is used for scraping off crystals generated on the side wall of the crystallizing tank and conveying the crystals to the discharge port. According to the utility model, crystallized products can be scraped off through the scraping module, so that the recovery rate of the products is improved, and the crystallized products can be prevented from being remained in the cooling unit to cause the reduction of the cooling crystallization efficiency.

Description

Technical Field

[0001] This utility model relates to the field of selenium dioxide preparation technology, specifically to an automated selenium production equipment. Background Technology

[0002] Selenium dioxide has a wide range of applications, including automotive glass manufacturing, optoelectronic materials, biomedicine, and environmental protection. It is typically produced using the nitric acid oxidation method, which involves reacting crude selenium with nitric acid to obtain H2SeO3, which is then decomposed by heating to obtain SeO2. During the heating process, the gaseous SeO2 is heated and then crystallized into solid SeO2 before being collected. However, the crystallization time is difficult to control, and crystals sometimes remain in the crystallization tank, leading to a decrease in product recovery rate. Furthermore, the reduced heat exchange efficiency results in a decrease in the efficiency of cooling and crystallization.

[0003] In the prior art, utility model patent (CN218879466U) discloses a production device for high-purity selenium dioxide, including a feeding hopper, a distillation furnace, a primary oxidation furnace, a secondary oxidation furnace, a primary cooler, a secondary cooler, and a tail gas treatment device, all connected by pipelines. The distillation furnace and oxidation furnace are equipped with temperature control devices and oxygen control devices. The cooler is equipped with a graphite cooler to cool the settled selenium dioxide product with air. The tail gas treatment device is equipped with a selenium-mercury adsorbent material to absorb selenium and mercury in the tail gas. This production device improves oxidation efficiency through two-stage oxidation and cooling. However, during the collection process, crystalline products may remain, thus affecting the product recovery rate.

[0004] Therefore, the technical problem to be solved in this case is: how to improve the cooling efficiency and recovery rate of selenium dioxide. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an automatic production equipment for selenium. This production equipment can cool and crystallize gaseous products through a cooling unit, and scrape off the crystallized products through a scraping module, thereby preventing the crystallized products from adhering to the side wall of the cooling unit, which would reduce the heat exchange efficiency and thus reduce the cooling and crystallization efficiency. On the other hand, it can also improve the product recovery rate. The scraping module can also transport the crystallized products to the discharge port for collection, preventing the crystallized products from remaining in the cooling unit.

[0006] The technical solution of this utility model is:

[0007] An automated selenium production equipment includes a reaction chamber for generating a gas containing selenium dioxide and a cooling unit connected to the reaction chamber. The cooling unit includes a crystallization tank and a scraping module disposed inside the crystallization tank. The crystallization tank is provided with an exhaust port and a discharge port. The gas is cooled and crystallized by heat exchange through the side wall of the crystallization tank. The scraping module is used to scrape the crystals generated on the side wall of the crystallization tank and transport them to the discharge port.

[0008] Preferably, the cooling unit is a crystallization tank, the scraping module is connected inside the crystallization tank, the discharge port and the exhaust port are both located on the crystallization tank, and the discharge port is equipped with a discharge valve.

[0009] Preferably, there are at least two crystallization tanks connected in series and staggered vertically. The number of scraping modules matches the number of crystallization tanks and is connected inside the crystallization tanks. The crystallization tank at the first end is connected to the air outlet, the discharge port is located on the crystallization tanks at both the first and last ends, and the exhaust port is located on the crystallization tank at the last end.

[0010] Preferably, there are three crystallization tanks, which are arranged in a triangular pattern.

[0011] Preferably, the reaction chamber is provided with a scraping unit for scraping reactants adhering to the side wall of the reaction chamber down to the bottom of the reaction chamber.

[0012] Preferably, the production equipment further includes an electromagnetic heating mechanism, which includes a support frame, an electromagnetic coil for heating the reactants in the reaction chamber, and a lifting unit on the support frame for driving the electromagnetic coil to move up and down so that the electromagnetic coil surrounds the outer wall of the reaction chamber.

[0013] Preferably, the reaction chamber is provided with a first feeding port for feeding a first reactant and a second feeding port for feeding a second reactant. The first feeding port is located on the side of the reaction chamber, and the second feeding port is located on the top of the reaction chamber.

[0014] Preferably, the scraping module is a first auger scraper.

[0015] Preferably, the scraping unit is a second auger scraper.

[0016] One of the above-described technical solutions of this utility model has at least one of the following advantages or beneficial effects:

[0017] This invention uses a cooling unit to cool and crystallize gaseous products, and a scraping module to scrape off the crystallized products, thereby preventing the crystallized products from adhering to the side wall of the cooling unit, which would reduce heat exchange efficiency and thus reduce the cooling and crystallization efficiency. On the other hand, it can also improve the product recovery rate. The scraping module can also transport the crystallized products to the discharge port for collection, preventing the crystallized products from remaining in the cooling unit. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0019] Figure 2 This is a schematic diagram of the reaction chamber of this utility model;

[0020] Figure 3 This is a perspective view of the reaction chamber of this utility model;

[0021] Figure 4 This is a schematic diagram of the collection mechanism in Embodiment 1 of this utility model;

[0022] Figure 5 This is a schematic diagram of the collection mechanism in Embodiment 2 of this utility model;

[0023] Figure 6 This is a perspective view of Embodiment 2 of the present invention.

[0024] The reference numerals for each of the attached figures are as follows: 1. Reaction chamber; 2. Electromagnetic heating mechanism; 3. Cooling unit; 4. Scraping unit; 11. First feeding port; 12. Second feeding port; 13. First chamber; 14. Second chamber; 21. Support frame; 22. Electromagnetic coil; 23. Lifting unit; 31. Crystallizer; 32. Discharge port; 33. Exhaust port; 34. Scraping module; 131. Air outlet; 231. Slider; 321. Discharge valve. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1

[0027] Please see Figures 1-4 An automated selenium production equipment includes a reaction chamber 1 for generating a gas containing selenium dioxide and a cooling unit 3 connected to the reaction chamber 1. The cooling unit 3 includes a crystallization tank 31 and a scraping module 34 disposed inside the crystallization tank 31. The crystallization tank 31 is provided with an exhaust port 33 and a discharge port 32. The gas is cooled and crystallized by heat exchange through the side wall of the crystallization tank 31. The scraping module 34 is used to scrape the crystals generated on the side wall of the crystallization tank 31 and transport them to the discharge port 32.

[0028] In practical applications, this embodiment takes the production of selenium dioxide as an example. Specifically, the operator puts selenium raw material and reaction products such as nitric acid into the reaction chamber 1 until gaseous selenium dioxide is produced. The gaseous selenium dioxide enters the cooling unit 3 from the gas outlet 131 and is cooled and crystallized at room temperature. During this process, the scraping module 34 scrapes off the crystallized selenium dioxide adhering to the side wall of the cooling unit 3. This helps to prevent the crystallized selenium dioxide from adhering to the side wall and thus reducing the heat exchange efficiency between the room temperature and the inside of the cooling unit 3. When the crystallized selenium dioxide adheres to the side wall of the cooling unit 3, the poor thermal conductivity of the crystalline material will hinder the cooling efficiency at room temperature. In addition, scraping off the selenium dioxide makes it easier for the selenium dioxide to remain in the cooling unit 3, thereby improving the selenium dioxide recovery rate. On the other hand, since the scraping module 34 continuously agitates the gas in the cooling unit 3, gas turbulence is formed, thereby improving the cooling efficiency of cooling crystallization.

[0029] Preferably, the cooling unit 3 is a crystallization tank 31, the scraping module 34 is connected inside the crystallization tank 31, the discharge port 32 and the exhaust port 33 are both located on the crystallization tank 31, and the discharge port 32 is provided with a discharge valve 321.

[0030] Through the above design, the discharge valve 321 is conducive to controlling the crystallized selenium dioxide to be discharged from the discharge port 32, and the exhaust port 33 is conducive to gas flow, thereby preventing the gas from not flowing in the crystallization tank 31 and causing the selenium dioxide recovery rate to decrease. Specifically, the exhaust port 33 can discharge the waste gas and treat the waste gas by connecting it with the external waste gas treatment device.

[0031] It should be noted that in this embodiment 1, there is one crystallization tank 31 and one scraping module 34.

[0032] Preferably, the reaction chamber 1 is provided with a scraping unit 4 for scraping the reactants adhering to the side wall of the reaction chamber 1 to the bottom of the reaction chamber 1.

[0033] The above design can prevent reactants from adhering to the reaction chamber 1, thus preventing incomplete reaction and residue of raw materials.

[0034] Preferably, the production equipment further includes an electromagnetic heating mechanism 2, which includes a support frame 21 and an electromagnetic coil 22 for heating the reactants in the reaction chamber 1. The support frame 21 is provided with a lifting unit 23, which is used to drive the electromagnetic coil 22 to rise and fall so that the electromagnetic coil 22 surrounds the outer wall of the reaction chamber 1.

[0035] In this embodiment, the heating efficiency can be improved by using the electromagnetic coil 22, which can extend the service life compared to crucible heating. The electromagnetic coil 22 generates eddy currents in the reactants in the reaction chamber 1, thereby rapidly heating the reactants to a gaseous state.

[0036] Specifically, in this embodiment, the lifting unit 23 includes a drive cylinder, a slide rail, and a base. The base has a slider 231. The drive cylinder can drive the base to slide along the slide rail, thereby driving the electromagnetic coil 22 to rise and fall.

[0037] Preferably, the reaction chamber 1 is provided with a first feeding port 11 for feeding a first reactant and a second feeding port 12 for feeding a second reactant. The first feeding port 11 is located on the side of the reaction chamber 1, and the second feeding port 12 is located on the top of the reaction chamber 1.

[0038] In this embodiment, the first reactant is selenium raw material and the second reactant is nitric acid, which are respectively fed into the reaction chamber 1 through the first feed port 11 and the second feed port 12, which facilitates the feeding operation by the staff.

[0039] Specifically, in this embodiment, the reaction chamber 1 is composed of a first chamber 13 and a second chamber 14, and the second chamber 14 is detachably connected to the first chamber 13. The first feed port 11 and the second feed port 12 are both located on the first chamber 13. The following description uses this embodiment as an example:

[0040] In actual operation, the staff first installs the second chamber 14 on the lifting unit 23 and raises it to the bottom of the first chamber 13 through the lifting unit 23, connecting the first chamber 13 and the second chamber 14. Specifically, in this embodiment, the first chamber 13 and the second chamber 14 are connected by a clamp. Then, the lifting unit 23 is lowered, the electromagnetic coil 22 is installed on the lifting unit 23, and the height of the electromagnetic coil 22 is adjusted to heat the reaction material in the reaction chamber 1 formed by the first chamber 13 and the second chamber 14.

[0041] Preferably, the scraping module 34 is a first auger scraper.

[0042] Preferably, the scraping unit 4 is a second auger scraper.

[0043] In this embodiment, both the scraping module 34 and the scraping unit 4 are auger scrapers, which is beneficial for conveying and scraping materials.

[0044] Example 2

[0045] refer to Figure 5 and Figure 6In this embodiment, there are at least two crystallization tanks 31 connected in series and staggered vertically. The number of scraping modules 34 matches the number of crystallization tanks 31 and is connected inside the crystallization tanks 31. The crystallization tank 31 at the first end is connected to the air outlet 131. The discharge port 32 is located on the crystallization tanks 31 at both the first and last ends, and the exhaust port 33 is located on the crystallization tank 31 at the last end.

[0046] Specifically, there are 3 crystallization tanks 31, which are arranged in a triangular pattern.

[0047] This embodiment uses three crystallization tanks 31 as an example, arranged in a triangular pattern. It should be noted that as the number increases, the arrangement is staggered. When gaseous selenium dioxide enters the first crystallization tank 31, some of it cools and crystallizes, then is scraped off and transported to the discharge port 32 of the first crystallization tank 31 by the scraping module 34. When gaseous selenium dioxide enters the second crystallization tank 31, some of it cools and crystallizes, then is scraped off and transported to the third crystallization tank 31 by the scraping module 34. The third crystallization tank 31 then uses the scraping module 34 to transport the crystallized selenium dioxide from the second crystallization tank 31 and the crystallized selenium dioxide from the third crystallization tank 31 together to the discharge port 32. This method ensures that gaseous selenium dioxide cools and crystallizes, facilitating collection.

[0048] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An automated selenium production equipment, comprising a reaction chamber for generating a gas containing selenium dioxide and a cooling unit connected to the reaction chamber, characterized in that, The cooling unit includes a crystallization tank and a scraping module disposed inside the crystallization tank. The crystallization tank is provided with an exhaust port and a discharge port. The gas is cooled and crystallized by heat exchange through the side wall of the crystallization tank. The scraping module is used to scrape the crystals generated on the side wall of the crystallization tank and transport them to the discharge port.

2. The automated selenium production equipment according to claim 1, characterized in that, The cooling unit is a crystallization tank, the scraping module is connected inside the crystallization tank, the discharge port and the exhaust port are both located on the crystallization tank, and the discharge port is equipped with a discharge valve.

3. The automated selenium production equipment according to claim 2, characterized in that, The number of crystallization tanks is at least two, and the at least two crystallization tanks are connected in series and arranged in a staggered manner. The number of scraping modules matches the number of crystallization tanks and is connected inside the crystallization tanks. The crystallization tank at the first end is connected to the air outlet. The discharge port is located on the crystallization tanks at both the first and last ends, and the exhaust port is located on the crystallization tank at the last end.

4. The automated selenium production equipment according to claim 3, characterized in that, The number of crystallization tanks is 3, and the 3 crystallization tanks are arranged in a triangular structure.

5. The automated selenium production equipment according to claim 1, characterized in that, The reaction chamber is equipped with a scraping unit for scraping reactants adhering to the side walls of the reaction chamber down to the bottom of the reaction chamber.

6. The automated selenium production equipment according to claim 1, characterized in that, The production equipment also includes an electromagnetic heating mechanism, which includes a support frame and an electromagnetic coil for heating the reactants in the reaction chamber. The support frame is equipped with a lifting unit, which is used to drive the electromagnetic coil to move up and down so that the electromagnetic coil surrounds the outer wall of the reaction chamber.

7. The automated selenium production equipment according to claim 1, characterized in that, The reaction chamber is provided with a first feeding port for feeding a first reactant and a second feeding port for feeding a second reactant. The first feeding port is located on the side of the reaction chamber, and the second feeding port is located on the top of the reaction chamber.

8. The automated selenium production equipment according to claim 1, characterized in that, The scraping module is the first auger scraper.

9. An automated selenium production equipment according to claim 5, characterized in that, The scraping unit is a second screw conveyor scraper.

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