Device for preparing selenium dioxide from crude selenium

Abstract

The utility model relates to a device for preparing selenium dioxide from crude selenium. The device consists of a vacuum drying melting furnace system and an oxidizing furnace system, by arranging the vacuum drying melting furnace and the water vapor condenser, acid radical ions in crude selenium can be removed, and seleninic acid is condensed, collected and returned to a seleninic acid system for retreatment, so that the corrosion of materials to subsequent equipment is reduced, the service life of the equipment is prolonged, and the production cost is reduced. By arranging the buffer tank, waste gas generated in the secondary oxidation process can be dedusted and returned to the seleninic acid system for retreatment, the selenium recycling rate is effectively increased, the purpose of clean production is achieved, and the production cost is reduced; the forehearth generator is arranged at the front section of the oxidation furnace, crude selenium is subjected to first-section oxidation and then subjected to second-section oxidation in the oxidation furnace, the crude selenium is fully oxidized, and the purity of selenium dioxide is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of crude selenium preparation selenium dioxide device, specifically belongs to the technical field of selenium dioxide manufacturing equipment. BACKGROUND

[0002] Selenium dioxide is applied to metallurgy, chemical industry, pharmacy and foodstuff etc., and one of the most important purposes is the additive of electrolytic manganese. With the rapid development of national economy, the demand for selenium dioxide in market is increasing.

[0003] The preparation of selenium dioxide in current industry mainly adopts oxygen oxidation method, and the raw material is mainly crude selenium produced in copper anode slime smelting process. In actual production process, Cl - , SO3 2- And H2SeO3 are contained in crude selenium, which will corrode subsequent equipment, seriously reduce the service life of equipment, increase the loss rate of selenium in crude selenium and reduce its recovery rate if not removed in advance. At the same time, the particle size of crude selenium produced in copper anode slime smelting process is generally less than 0.05 mm, which is directly put into oxidation furnace for oxidation reaction. Since the particle size is small, it is not easy to control the oxidation reaction speed and degree, thereby reducing the quality of selenium dioxide product. The traditional oxygen oxidation method directly adds crude selenium into oxidation furnace for high-temperature heating, so that selenium reacts with oxygen to generate selenium dioxide. However, in this process, a large amount of selenium evaporates and only reacts with oxygen once, and part of selenium does not have enough time to react with oxygen, which leads to incomplete oxidation, so that part of selenium is contained in selenium dioxide product, which seriously affects the purity of selenium dioxide product. SUMMARY

[0004] In view of the above status, the utility model provides a kind of crude selenium preparation selenium dioxide device, by improving device arrangement structure, to solve the foregoing problems of crude selenium refining selenium dioxide production equipment corrosion, short service life of equipment and low selenium recovery rate.

[0005] The utility model discloses a kind of crude selenium preparation selenium dioxide device is constituted by vacuum drying melting furnace system and oxidizing furnace system;Wherein, vacuum drying melting furnace system is constituted by U-shaped fin type heating tube (1), furnace shell (2), heat insulation layer (3), tray (4), tray rack (5), radiation lining plate (6), vacuum tube (7), water ring vacuum pump (8), furnace door (9), section steel framework (10), water vapor condenser (11), plastic pipeline pump (12), plastic water storage tank (13), underframe (14) and vacuum drying melting furnace (15);Oxidizing furnace system is constituted by feeding cylinder (16), feeding hopper (17), front furnace generator (18), reaction tray (19), front furnace generator temperature measuring hole (20), oxidizing furnace oxygen pipe (21), oxidizing furnace temperature measuring hole (22), oxidizing furnace (23), product collector (24), scraper reducer (25), support (26), discharging valve (27), sediment collection tank (28), sediment collection tank discharge port (29), front furnace generator oxygen pipe (30), buffer tank (31) and negative pressure pipe interface (32).

[0006] In the vacuum drying melting furnace system, the vacuum drying melting furnace (15) is placed above the underframe (14), the outer side of the furnace body is the furnace shell (2), the inner side is provided with the radiation lining plate (6), the heat insulation layer (3) is filled between the furnace shell (2) and the radiation lining plate (6), and the section steel framework (10) is fixed therein; six groups of U-shaped fin type heating tubes (1) are arranged on both sides of the furnace cavity, the tray rack (5) is arranged in the middle of the furnace cavity, and the tray (4) is arranged on the tray rack (5); the vacuum drying melting furnace (15) is connected with the water vapor condenser (11) through a communication pipe; the water vapor condenser (11) is connected with the water ring vacuum pump (8) through the vacuum tube (7); the plastic pipeline pump (12) is arranged below the water ring vacuum pump (8), and connected with the plastic water storage tank (13) through a plastic pipeline.

[0007] In the oxidizing furnace system, the reaction tray (19) is arranged at the bottom of the front furnace generator (18), the top of the front furnace generator (18) is respectively provided with the feeding hopper (17), the feeding cylinder (16), the front furnace generator temperature measuring hole (20) and the oxygen pipe (30); the top of the oxidizing furnace (23) is provided with the oxidizing furnace temperature measuring hole (22), and connected with the product collector (24) through a communication pipe; the communication pipe between the front furnace generator (18) and the oxidizing furnace (23) is provided with the oxidizing furnace oxygen pipe (21); the top of the product collector (24) is provided with the scraper reducer (25), and the bottom is provided with the discharging valve (27); the product collector (24) is sequentially connected with the sediment collection tank (28) and the buffer tank (31) through communication pipes; the sediment collection tank (28) is provided with the sediment tank discharge port (29) at the bottom, and the tank body side of the buffer tank (31) is provided with the negative pressure pipe interface (32); the product collector (24), the sediment collection tank (28) and the buffer tank (31) are all fixed on the support (26).

[0008] The crude selenium preparation selenium dioxide device of the utility model sets up vacuum drying melting furnace and water vapor condenser, can remove acid radical ion in crude selenium and return to selenious acid system after selenious acid condensation collection and handle again, thereby reduce the corrosion of material to subsequent equipment, prolong the service life of equipment, and through setting up buffer tank can also carry out dust removal to waste gas generated in secondary oxidation process and return to selenious acid system and handle again, effectively improve the selenium recycling rate, reach the purpose of clean production, reduce production cost;The front furnace generator is set in the front section of the oxidation furnace, after the first stage oxidation of crude selenium, the second stage oxidation is carried out in the oxidation furnace, and the crude selenium is fully oxidized, and the purity of selenium dioxide is high. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 : the front view of the vacuum drying melting furnace of the utility model;

[0010] Figure 2 : the side view of the vacuum drying melting furnace of the utility model;

[0011] Figure 3 : the plan view of the vacuum drying melting furnace of the utility model;

[0012] Figure 4 : the front view of the oxidation furnace of the utility model;

[0013] Figure 5 : the side view of the oxidation furnace of the utility model;

[0014] Figure 6 : the plan view of the oxidation furnace of the utility model;

[0015] Figure 7 : the connection diagram of each equipment in the crude selenium preparation selenium dioxide device of the utility model;

[0016] In the drawing: 1, U-shaped fin type heating pipe;2, furnace shell;3, heat insulation layer;4, tray;5, tray rack;6, radiation lining plate;7, vacuum pipe;8, water ring vacuum pump;9, furnace door;10, profile steel framework;11, water vapor condenser;12, plastic pipeline pump;13, plastic water storage tank;14, chassis;15, vacuum drying melting furnace;16, feeding cylinder;17, feeding hopper;18, front furnace generator;19, reaction tray;20, front furnace generator temperature measuring hole;21, oxidation furnace oxygen pipe;22, oxidation furnace temperature measuring hole;23, oxidation furnace;24, product collector;25, scraper reducer;26, support;27, discharging valve;28, sedimentation collection tank;29, sedimentation collection tank discharge port;30, front furnace generator oxygen pipe;31, buffer tank;32, negative pressure pipe interface. DETAILED DESCRIPTION

[0017] Example 1

[0018] The device for preparing selenium dioxide from crude selenium is composed of a vacuum drying and melting furnace system and an oxidation furnace system. The vacuum drying and melting furnace system is composed of U-shaped finned heating pipes (1), a furnace shell (2), a heat insulation layer (3), a tray (4), a tray rack (5), a radiation lining plate (6), a vacuum pipe (7), a water ring vacuum pump (8), a furnace door (9), a steel skeleton (10), a water vapor condenser (11), a plastic pipeline pump (12), a plastic water storage tank (13), a base frame (14), and a vacuum drying and melting furnace (15). The oxidation furnace system is composed of a feeding cylinder (16), a feeding hopper (17), a front furnace generator (18), a reaction tray (19), a front furnace generator temperature measuring hole (20), an oxidation furnace oxygen pipe (21), an oxidation furnace temperature measuring hole (22), an oxidation furnace (23), a product collector (24), a scraper reducer (25), a support (26), a discharging valve (27), a sedimentation collection tank (28), a sedimentation collection tank discharge port (29), a front furnace generator oxygen pipe (30), a buffer tank (31), and a negative pressure pipe interface (32).

[0019] Example 2

[0020] In the vacuum drying and melting furnace system, the vacuum drying and melting furnace (15) is placed above the base frame (14), the outer side of the furnace body is the furnace shell (2), the inner side is provided with the radiation lining plate (6), the furnace shell (2) and the radiation lining plate (6) are filled with the heat insulation layer (3) and the steel skeleton (10) is fixed therein; six groups of U-shaped finned heating pipes (1) are arranged on both sides of the furnace cavity, the tray rack (5) is arranged in the middle of the furnace cavity and the tray (4) is arranged on the tray rack (5); the vacuum drying and melting furnace (15) is connected with the water vapor condenser (11) through a communication pipe; the water vapor condenser (11) is connected with the water ring vacuum pump (8) through the vacuum pipe (7); the plastic pipeline pump (12) is arranged below the water ring vacuum pump (8) and connected with the plastic water storage tank (13) through a plastic pipeline.

[0021] Example 3

[0022] In the oxidizer system, a reaction material tray (19) is set at the bottom of the front furnace generator (18), and an oxidizer oxygen pipe (21) is set above the connecting pipe between it and the oxidizer (23); a feed hopper (17) is set on the left side of the reaction material tray (19), and a feed cylinder (16), a front furnace generator oxygen pipe (30), and a front furnace generator temperature measuring hole (20) are respectively set above it; an oxidizer temperature measuring hole (22) is set at the top of the oxidizer (23), and is connected to the product collector (2) through a connecting pipe (2). 4) A scraper reducer (25) is provided above the product collector (24), and a discharge valve (27) is provided below it; the product collector (24) is connected to the sedimentation collection box (28) and the buffer tank (31) in sequence through a connecting pipe; the sedimentation collection box (28) is provided with a sedimentation box outlet (29) below it, and the tank body of the buffer tank (31) is provided with a negative pressure pipe interface (32); the product collector (24), the sedimentation collection box (28) and the buffer tank (31) are all fixed above the bracket (26).

[0023] Example 4

[0024] This invention incorporates a vacuum drying and melting furnace system before the oxidation process. The crude selenium material is added to the vacuum drying and melting furnace for drying and melting. During this process, the natural water in the crude selenium material evaporates, and the entrained Cl-... - SO3 2- The acidic anions and H₂SeO₃ are removed at high temperature to prevent corrosion of downstream equipment; simultaneously, the evaporated acidic aqueous solution (containing Cl₂) is treated... - SO3 2- (H2SeO3) continues to return to the selenite system, reducing selenium loss and improving selenium recovery rate.

[0025] After vacuum drying and melting, the crude selenium material is cast into crude selenium ingots. These ingots are then crushed before entering the oxidation furnace to control the reaction rate and extent during oxidation, thus improving the purity of selenium dioxide. A two-stage oxidation process is implemented. A pre-furnace generator is installed at the front end of the oxidation furnace. The crude selenium blocks enter the pre-furnace generator to melt and undergo a first-stage oxidation with oxygen. Subsequently, the sublimated selenium dioxide and selenium are blown into the oxidation furnace for a second oxidation, ensuring complete conversion of elemental selenium into selenium dioxide and improving its purity. During oxidation, some selenium dioxide is carried by the high-temperature waste gas into a buffer tank. This portion of selenium dioxide is absorbed by water in the buffer tank and, after a period of accumulation, returned to the selenite system for further reduction and recovery, thus improving the system's selenium recovery rate.

Claims

1. A device for preparing selenium dioxide from crude selenium, characterized in that it comprises: The device is composed of a vacuum drying melting furnace system and an oxidation furnace system; wherein, the vacuum drying melting furnace system is composed of a U-shaped fin type heating pipe (1), a furnace shell (2), a heat insulation layer (3), a material tray (4), a material tray rack (5), a radiation lining plate (6), a vacuum pipe (7), a water ring vacuum pump (8), a furnace door (9), a profile steel framework (10), a water vapor condenser (11), a plastic pipeline pump (12), a plastic water storage tank (13), a bottom frame (14) and a vacuum drying melting furnace (15); the oxidation furnace system is composed of a feeding cylinder (16), a feeding hopper (17), a front furnace generator (18), a reaction material tray (19), a front furnace generator temperature measuring hole (20), an oxidation furnace oxygen pipe (21), an oxidation furnace temperature measuring hole (22), an oxidation furnace (23), a product collector (24), a scraper reducer (25), a support (26), a discharging valve (27), a sedimentation collection tank (28), a sedimentation collection tank discharge port (29), a front furnace generator oxygen pipe (30), a buffer tank (31) and a negative pressure pipe interface (32).

2. A device for preparing selenium dioxide from crude selenium according to claim 1, characterized in that: In the vacuum drying melting furnace system, the vacuum drying melting furnace (15) is placed above the bottom frame (14), the outer side of the furnace body is the furnace shell (2), the inner side is provided with the radiation lining plate (6), the furnace shell (2) and the radiation lining plate (6) are filled with the heat insulation layer (3), and the profile steel framework (10) is fixed therein; six groups of U-shaped fin type heating pipes (1) are arranged on both sides of the furnace cavity, the material tray rack (5) is arranged in the middle of the furnace cavity and the material tray (4) is arranged on the material tray rack (5); the vacuum drying melting furnace (15) is connected with the water vapor condenser (11) through a communication pipe; the water vapor condenser (11) is connected with the water ring vacuum pump (8) through the vacuum pipe (7); the water ring vacuum pump (8) is provided with the plastic pipeline pump (12) below and connected with the plastic water storage tank (13) through a plastic pipeline.

3. A device for preparing selenium dioxide from crude selenium according to claim 1 or 2, characterized in that: In the oxidation furnace system, the bottom of the front furnace generator (18) is provided with the reaction material tray (19), the top of the front furnace generator (18) is provided with the feeding hopper (17), the feeding cylinder (16), the front furnace generator temperature measuring hole (20) and the oxygen pipe (30); the top of the oxidation furnace (23) is provided with the oxidation furnace temperature measuring hole (22) and connected with the product collector (24) through a communication pipe; the communication pipe between the front furnace generator (18) and the oxidation furnace (23) is provided with the oxidation furnace oxygen pipe (21); the top of the product collector (24) is provided with the scraper reducer (25) and the bottom is provided with the discharging valve (27); the product collector (24) is connected with the sedimentation collection tank (28) and the buffer tank (31) through communication pipes in sequence; the bottom of the sedimentation collection tank (28) is provided with the sedimentation tank discharge port (29), and the tank body side of the buffer tank (31) is provided with the negative pressure pipe interface (32); the product collector (24), the sedimentation collection tank (28) and the buffer tank (31) are all fixed on the support (26).

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