Silicon thermal magnesium reduction tank

Abstract

The present application provides a silicon thermal magnesium reduction tank, comprising a tank body, the tank body is connected to a cooling water jacket, one end of the tank body extending into the furnace is sealed to form a reaction chamber, the cooling water jacket extends out of the furnace to form a cooling chamber, and is provided with an opening and sealed by an end cover; a crystallizer is installed in the cooling water jacket, and an exhaust pipe is provided on the side of the cooling water jacket between the crystallizer and the end cover; a filter device is provided at the connection between the tank body and the cooling water jacket; and a heat exchange jacket is provided on the outer wall of the cooling water jacket. The reduction tank of the present application filters and purifies magnesium vapor by providing a filter device at the connection between the tank body and the cooling water jacket, thereby overcoming the disadvantage that in the existing silicon thermal magnesium smelting device, when smelting magnesium, dust and other solid particles generated during the smelting process are mixed into the magnesium vapor, condensed together with the magnesium vapor, resulting in low purity of the smelted metal magnesium.

Description

Technical Field

[0001] The present application relates to the technical field of magnesium metal production, and in particular to a silicon thermal method magnesium smelting reduction tank. Background Art

[0002] Magnesium metal is a lightweight, high-strength, corrosion-resistant metal material that is widely used in aviation, aerospace, automobiles, electronics, medical and other fields. At present, the most important downstream application field of magnesium alloys is the production and manufacturing of automobiles, and about 70% of magnesium alloys are used in automobile manufacturing. The reason why magnesium alloys are widely used in automobile manufacturing is mainly due to their low density, light weight and high strength, which can reduce the weight of the car without reducing the quality of the car. In addition, energy conservation and emission reduction will promote the development of lightweight automobiles, thereby driving up the demand for magnesium alloy materials.

[0003] There are three methods for producing magnesium metal: electrolysis, silicothermic method (Pidgeon method) and carbon thermal method. The silicothermic method is widely used because of its short process flow, low investment, fast plant construction and low cost. The main production process of the silicothermic method is to grind and mix the three raw materials of calcined dolomite, ferrosilicon and fluorite according to the ratio, press them into jujube-shaped balls of about 3 to 5 cm, and fill them into cylindrical reduction tanks in a stacked manner. The reduction tanks are mostly set horizontally. Under the conditions of a vacuum of about 10Pa and a high temperature of more than 1200℃, an oxidation-reduction reaction occurs. Then, magnesium vapor escapes from the reduction tank with the assistance of a vacuum unit and condenses into crude magnesium in the crystallizer.

[0004] However, in actual production, the gas emitted with the magnesium vapor also contains dust and other impurities that affect the purity of the magnesium. These impurities will condense along with the magnesium vapor, resulting in a decrease in the purity of the smelted magnesium metal. Utility Model Content

[0005] The present application provides a silicon thermal method magnesium smelting reduction tank, which is used to solve the problem that dust and other solid particles generated during the smelting process are mixed into the magnesium vapor and condensed together with the magnesium vapor, resulting in low purity of the smelted metal magnesium.

[0006] The present application provides a silicon thermal method magnesium smelting reduction tank, comprising a tank body, the tank body being connected to a cooling water jacket;

[0007] One end of the tank body extending into the furnace is sealed to form a reaction chamber, and the cooling water jacket extends out of the furnace to form a cooling chamber, and is provided with an opening and sealed by an end cover;

[0008] A crystallizer is installed in the cooling water jacket, and an exhaust pipe is provided on the side of the cooling water jacket between the crystallizer and the end cover;

[0009] A filtering device is provided at the connection between the tank body and the cooling water jacket;

[0010] The outer wall of the cooling water jacket is provided with a heat exchange jacket.

[0011] Optionally, the filtering device comprises a fixing frame matching the shape of the inner wall of the tank, and at least one layer of filtering net is installed in the fixing frame.

[0012] Optionally, multiple layers of filter screens are installed in the fixed frame;

[0013] The mesh openings of the multi-layer filter are gradually reduced along the direction of magnesium vapor travel.

[0014] Optionally, a heat-blocking device is further provided in the tank body, and the heat-blocking device is close to the cooling water jacket;

[0015] The heat-blocking device comprises an outer ring matching the shape of the inner wall of the tank body and an inner ring coaxially arranged with the outer ring, the outer ring and the outer ring are connected by a gas blocking disk; the inner ring is closed by a baffle;

[0016] A labyrinth-type passage is arranged inside the air blocking disk to connect the two sides of the air blocking disk.

[0017] Optionally, the tank body is rotatably connected to the cooling water jacket and sealed by a dynamic seal;

[0018] The tank body is connected with the motor through a transmission device.

[0019] Optionally, a plurality of spiral ribs are provided on the inner wall of the tank.

[0020] Optionally, the closed end of the can body is recessed to form a hollow cavity.

[0021] The silicon thermal magnesium reduction tank provided in the present application filters and retains dust and other solid particles that affect the purity of magnesium that are output together with magnesium vapor during the magnesium smelting process by arranging a filtering device at the connection between the tank body and the cooling water jacket, so that the filtered and purified magnesium vapor can be condensed and crystallized in a crystallizer to obtain metallic magnesium with higher purity, thereby overcoming the disadvantage that in the existing silicon thermal magnesium smelting device, when smelting magnesium, dust and other solid particles generated during the smelting process are mixed into the magnesium vapor and condensed together with the magnesium vapor, resulting in low purity of the smelted metallic magnesium. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of a silicon thermal method magnesium smelting reduction tank is provided for one embodiment of the present application;

[0024] Figure 2 A structural schematic diagram of a filtering device is provided for one embodiment of the present application;

[0025] Figure 3 A schematic diagram of the structure of a silicon thermal method magnesium smelting reduction tank provided in another embodiment of the present application;

[0026] Figure 4 A schematic diagram of the structure of a heat-resistant device provided in one embodiment of the present application;

[0027] Figure 5 A structural schematic diagram of a silicon thermal method magnesium smelting reduction tank is provided for another embodiment of the present application;

[0028] Figure 6 A schematic diagram of the internal cross-sectional structure of a tank body provided in another embodiment of the present application.

[0029] Description of reference numerals:

[0030] 1. Tank body; 2. Crystallizer; 3. Filter device; 4. Heat-blocking device; 11. Cooling water jacket; 12. End cover; 13. Heat exchange jacket; 14. Transmission device; 15. Motor; 16. Spiral ribs; 17. Hollow cavity; 31. Fixed frame; 32. Filter screen; 41. Outer ring; 42. Inner ring; 43. Air blocking disk; 101. Air extraction pipe; 421. Baffle; 431. Labyrinth passage. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0032] like Figure 1 As shown, the present application provides a silicon thermal method magnesium smelting reduction tank, comprising a tank body 1, the tank body 1 is connected to a cooling water jacket 11;

[0033] One end of the tank body 1 extending into the furnace is sealed to form a reaction chamber, and the cooling water jacket 11 extends out of the furnace to form a cooling chamber, and is provided with an opening and sealed by an end cover 12;

[0034] The crystallizer 2 is installed in the cooling water jacket 11, and an exhaust pipe 101 is provided on the side of the cooling water jacket 11 between the crystallizer 2 and the end cover 12;

[0035] A filter device 3 is provided at the connection between the tank body 1 and the cooling water jacket 11;

[0036] The outer wall of the cooling water jacket 11 is provided with a heat exchange jacket 13 .

[0037] When smelting magnesium, a certain amount of smelting raw materials (mainly pellets pressed from calcined dolomite and reducing agent) are loaded into the reduction tank, the tank body 1 is placed horizontally in the furnace, and the crystallizer 2 is installed in the cooling chamber of the cold water jacket 11, and then sealed with the end cover 12. After sealing, a vacuum pump is used to evacuate the exhaust pipe 101, and the reduction tank is heated by the combustion of fuel in the furnace. When the temperature in the tank body 1 rises to above 1150°C, the smelting raw materials undergo oxidation-reduction reactions in a vacuum environment (about 13Pa) to generate metallic magnesium vapor.

[0038] The generated magnesium vapor moves from the tank body 1 to the cooling water jacket 11 under the suction action of the vacuum pump, and the heat carried by the magnesium vapor is also output. When the magnesium vapor passes through the filter device 3, the filter device 3 filters the magnesium vapor and filters out the dust, large particles of solid impurities, etc. entrained in the magnesium vapor.

[0039] The magnesium vapor filtered by the filter device 3 enters the crystallizer 2. Since a cooling water jacket 11 is provided outside the cooling chamber for heat exchange cooling, the crystallizer 2 is in a low temperature environment of the cooling chamber. The magnesium vapor will condense and deposit in the crystallizer 2, and the gaseous impurities that cannot be condensed will be extracted from the exhaust pipe 101 and then input into the corresponding exhaust gas treatment section for treatment.

[0040] When the smelting is completed, the vacuum is broken, the end cover 12 is opened, the crystallizer 2 is taken out from the cooling chamber, and the slag is discharged.

[0041] The silicon thermal magnesium reduction tank of the present application is provided with a filter device 3 at the connection between the tank body 1 and the cooling water jacket 11, so as to filter and retain the dust and other solid particles that affect the purity of magnesium that are output together with the magnesium vapor during the magnesium smelting process, so that the filtered and purified magnesium vapor can be condensed and crystallized in the crystallizer 2 to obtain metallic magnesium with higher purity, thereby overcoming the disadvantage that in the existing silicon thermal magnesium smelting device, when smelting magnesium, the magnesium vapor is not purified, resulting in the dust and other solid particles generated during the smelting process being mixed into the magnesium vapor, and condensing together with the magnesium vapor, resulting in the low purity of the metallic magnesium obtained by smelting.

[0042] like Figure 2 As shown, optionally, the filtering device 3 includes a fixing frame 31 matching the shape of the inner wall of the tank body 1 , and at least one layer of filtering net 32 ​​is installed in the fixing frame 31 .

[0043] In the present application, the filter 32 is a main component for filtering magnesium vapor. The filter 32 can intercept some solid impurities in the magnesium vapor, thereby improving the purity of the produced metal magnesium.

[0044] like Figure 2As shown, optionally, a multi-layer filter screen 32 is installed in the fixing frame 31;

[0045] The mesh openings of the multi-layer filter 32 are gradually reduced along the direction in which the magnesium vapor travels.

[0046] In the present application, a plurality of layers of filter screens 32 are provided, and the filtering and intercepting effect of the filtering device can be improved by stacking the plurality of layers of filter screens 32 for use.

[0047] The mesh openings of the multi-layer filter 32 are gradually reduced along the direction of the magnesium vapor, so that the solid particle impurities can be intercepted in layers, thereby further improving the interception effect.

[0048] like Figure 3 and Figure 4 As shown, optionally, a heat-blocking device 4 is further provided in the tank body 1, and the heat-blocking device 4 is close to the cooling water jacket 11;

[0049] like Figure 4 As shown, the heat-resisting device 4 comprises an outer ring 41 matching the shape of the inner wall of the tank body and an inner ring 42 coaxially arranged with the outer ring 41, and the outer ring 41 and the outer ring 41 are connected by an air-blocking disk 43; the inner ring 42 is closed by a baffle 421;

[0050] A labyrinth passage 431 is provided inside the air blocking disk 43 to connect the two sides of the air blocking disk 43 .

[0051] In the present application, since the raw materials are pressed into pellets and accumulated in the tank body 1 during use, and the tank body 1 is arranged horizontally, this loose accumulation will cause some pellets to roll down to the vicinity of the reduction tank mouth (i.e., the connection between the tank body 1 and the cooling water jacket 11), where the temperature is relatively low, which will reduce the reaction of the raw material pellets and cause a decrease in the raw material reaction rate.

[0052] The heat carried by the magnesium vapor is also output together with the magnesium vapor. When the magnesium vapor reaches the position of the heat-resistant device 4, due to the presence of the gas-blocking disk 43 in the heat-resistant device 4, the maze-like channel therein will reduce the traveling speed of the magnesium vapor, thereby reducing the heat loss along with the magnesium vapor, effectively increasing the temperature near the heat-resistant device 4, and making the temperature distribution in the tank body 1 more uniform, so that more material balls can be separated from the inadequate reaction zone, thereby improving the reaction rate.

[0053] Furthermore, the movement rate of the magnesium vapor will be reduced after passing through the heat-resisting device 4 , which is beneficial to the filtering device 3 for filtering the magnesium vapor.

[0054] In actual use, to avoid the maze-like passage 431 from being blocked, the number of folding corners should not be too many, preferably 2 to 6. In the present application, the two sides of the air blocking disk 43 refer to the side close to the tank body 1 and the side close to the cooling water jacket 11 .

[0055] like Figure 5As shown, optionally, the tank body 1 is rotatably connected to the cooling water jacket 11 and is sealed by a dynamic seal;

[0056] The tank body 1 is connected to the motor 15 via a transmission device 14 .

[0057] In this application Figure 5 The positions of the transmission device 14 and the motor 15 shown are only drawn for illustration. In practice, heat insulation measures must be taken. The tank body 1 is connected to the motor 15 through the transmission device 14. The motor 15 can drive the tank body 1 to rotate during smelting, so that the pellets in the tank body 1 are evenly heated.

[0058] like Figure 6 As shown, optionally, a plurality of spiral ribs 16 are provided on the inner wall of the tank body 1 .

[0059] In the present application, the spiral ribs 16 transport the smelting raw materials in a direction away from the cooling water jacket 11 when the tank body 1 rotates. The use of multiple spiral ribs 16 in conjunction with the rotating tank body 1 can effectively prevent the smelting raw materials from moving in the direction of the cooling water jacket 11 when the tank body 1 rotates, which may cause the adverse consequences of incomplete reaction of the raw materials. Moreover, the presence of the spiral ribs 16 can also improve the heat exchange efficiency, so that the smelting raw materials are heated more evenly. In addition, after the smelting is completed, the motor 15 can drive the tank body 1 to reverse and discharge the smelting slag in the tank body 1.

[0060] like Figure 5 As shown, optionally, the closed end of the tank body 1 is concave to form a hollow cavity 17 .

[0061] In the present application, the hollow cavity 17 can be used for heat conduction through the hollow cavity 17, so that the raw materials can be heated more evenly and faster; secondly, the hollow cavity 17 extends into the tank body 1 and is coaxially arranged with the tank body 1. The position of the hollow cavity 17 can prevent the problem of low reaction rate caused by uneven heating of the raw materials at the center. The outer diameter of the hollow cavity 17 can be selected according to actual needs.

[0062] Example 1

[0063] A silicon thermal method magnesium smelting reduction tank, the use process of which is as follows:

[0064] When smelting magnesium, a certain amount of smelting raw materials (mainly pellets pressed from calcined dolomite and reducing agent) are loaded into the reduction tank, the tank body 1 is placed horizontally in the furnace, and the crystallizer 2 is installed in the cooling chamber of the cold water jacket 11, and then sealed with the end cover 12. After sealing, a vacuum pump is used to evacuate the exhaust pipe 101, and the reduction tank is heated by the combustion of fuel in the furnace. When the temperature in the tank body 1 rises to above 1150°C, the smelting raw materials undergo oxidation-reduction reactions in a vacuum environment (about 13Pa) to generate metallic magnesium vapor.

[0065] The generated magnesium vapor moves from the tank body 1 to the cooling water jacket 11 under the suction of the vacuum pump, and the heat carried by the magnesium vapor is also output together with the magnesium vapor. When the magnesium vapor moves to the position of the heat-blocking device 4, due to the presence of the air-blocking disk 43 in the heat-blocking device 4, the labyrinth channel therein will reduce the speed of the magnesium vapor, thereby reducing the heat loss with the magnesium vapor, effectively increasing the temperature near the heat-blocking device 4, and making the temperature distribution in the tank body 1 more uniform, so that more material balls can be separated from the insufficient reaction zone and the reaction rate can be improved. After the magnesium vapor is decelerated by the heat-blocking device 4, when passing through the filter device 3, the multi-layer filter 32 in the filter device 3 filters the magnesium vapor, and filters the dust, large particles of solid impurities, etc. entrained in the magnesium vapor.

[0066] The magnesium vapor filtered by the filter device 3 enters the crystallizer 2. Since a cooling water jacket 11 is provided outside the cooling chamber for heat exchange cooling, the crystallizer 2 is in a low temperature environment of the cooling chamber. The magnesium vapor will condense and deposit in the crystallizer 2, and the gaseous impurities that cannot be condensed will be extracted from the exhaust pipe 101 and then input into the corresponding exhaust gas treatment section for treatment.

[0067] When the smelting is completed, the vacuum is broken, and the end cover 12 is opened, the crystallizer 12 is taken out from the cooling chamber, and the smelting slag in the tank body 1 is discharged.

[0068] Example 2

[0069] A silicon thermal method magnesium smelting reduction tank, the use process of which is as follows:

[0070] When smelting magnesium, a certain amount of smelting raw materials (mainly pellets pressed from calcined dolomite and reducing agent) are loaded into the reduction tank, the tank body 1 is placed horizontally in the furnace, and the crystallizer 2 is installed in the cooling chamber of the cold water jacket 11, and then sealed with the end cover 12. After sealing, a vacuum pump is used to evacuate the exhaust pipe 101, and the reduction tank is heated by the combustion of fuel in the furnace. At the same time, the motor 15 is turned on to drive the tank body 1 to rotate through the transmission device (gear or sprocket). Due to the presence of the spiral ribs 16, during the rotation of the tank body 1, the spiral ribs 16 will transport the smelting raw materials in the direction away from the cooling water jacket 11, thereby preventing part of the smelting raw materials from moving in the direction of the cooling water jacket 11 during the rotation of the tank body 1, which will cause the adverse consequences of incomplete raw material reaction. During the heating process, due to the presence of the hollow cavity 17, part of the heat in the furnace will be transferred from the hollow cavity 17 to the smelting raw materials in the tank body 1, so that the smelting raw materials can be heated more evenly. The presence of the spiral ribs 16 can also improve the heat exchange efficiency, which is beneficial to the heating of the reaction raw materials.

[0071] When heating in the furnace, when the temperature in the tank body 1 rises to above 1150° C., the smelting raw materials undergo oxidation-reduction reactions in a vacuum environment (about 10 Pa) to generate metallic magnesium vapor.

[0072] The generated magnesium vapor moves from the tank body 1 to the cooling water jacket 11 under the suction of the vacuum pump, and the heat carried by the magnesium vapor is also output together with the magnesium vapor. When the magnesium vapor moves to the position of the heat-blocking device 4, due to the presence of the air-blocking disk 43 in the heat-blocking device 4, the labyrinth channel therein will reduce the speed of the magnesium vapor, thereby reducing the heat loss with the magnesium vapor, effectively increasing the temperature near the heat-blocking device 4, and making the temperature distribution in the tank body 1 more uniform, so that more material balls can be separated from the insufficient reaction zone and the reaction rate can be improved. After the magnesium vapor is decelerated by the heat-blocking device 4, when passing through the filter device 3, the multi-layer filter 32 in the filter device 3 filters the magnesium vapor, and filters the dust, large particles of solid impurities, etc. entrained in the magnesium vapor.

[0073] The magnesium vapor filtered by the filter device 3 enters the crystallizer 2. Since a cooling water jacket 11 is provided outside the cooling chamber for heat exchange cooling, the crystallizer 2 is in a low temperature environment of the cooling chamber. The magnesium vapor will condense and deposit in the crystallizer 2, and the gaseous impurities that cannot be condensed will be extracted from the exhaust pipe 101 and then input into the corresponding exhaust gas treatment section for treatment.

[0074] When the smelting is completed, the vacuum is broken, and the end cover 12 is opened, and the crystallizer 12 is taken out from the cooling chamber, and the motor 15 is reversed to drive the tank body 1 to reverse, and the smelting slag in the tank body 1 is discharged.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A silicon thermal process magnesium reduction tank, characterized in that: It comprises a tank body (1), wherein the tank body (1) is in communication with a cooling water jacket (11); One end of the tank body (1) extending into the furnace is sealed to form a reaction chamber, and the cooling water jacket (11) extends out of the furnace to form a cooling chamber, and is provided with an opening and sealed by an end cover (12); A crystallizer (2) is installed in the cooling water jacket (11), and an exhaust pipe (101) is provided on the side of the cooling water jacket (11) between the crystallizer (2) and the end cover (12); A filtering device (3) is provided at the connection between the tank body (1) and the cooling water jacket (11); The outer wall of the cooling water jacket (11) is provided with a heat exchange jacket (13); The filtering device (3) comprises a fixing frame (31) having a shape matching that of the inner wall of the tank body (1), and at least one layer of filtering screen (32) is installed in the fixing frame (31); Multiple layers of filter screens (32) are installed in the fixed frame (31); The mesh openings of the multiple layers of filter screens (32) are gradually reduced along the direction in which the magnesium vapor travels.

2. The silicon thermal magnesium reduction tank according to claim 1, characterized in that: A heat-blocking device (4) is also provided in the tank body (1), and the heat-blocking device (4) is close to the cooling water jacket (11); The heat-blocking device (4) comprises an outer ring (41) matching the shape of the inner wall of the tank body and an inner ring (42) coaxially arranged with the outer ring (41), wherein the outer ring (41) and the outer ring (41) are connected via an air blocking disk (43); the inner ring (42) is closed by a baffle (421); A labyrinth-type channel (431) is provided inside the air blocking disk (43) to connect the two sides of the air blocking disk (43).

3. The silicon thermal process magnesium reduction tank according to claim 1, characterized in that: The tank body (1) is rotatably connected to the cooling water jacket (11) and is sealed by a dynamic seal; The tank body (1) is connected to a motor (15) via a transmission device (14).

4. The silicon thermal magnesium reduction tank according to claim 3, characterized in that: A plurality of spiral ribs (16) are provided on the inner wall of the tank body (1).

5. The silicon thermal magnesium reduction tank according to any one of claims 1 to 4, characterized in that: The closed end of the tank body (1) is concave to form a hollow cavity (17).

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