Vertical reduction tank

Abstract

The utility model provides a vertical reduction tank which comprises a tank body, a crystallizer and a bottom cover, and an inner cavity used for containing honeycomb briquette-shaped materials is formed in the tank body; the bottom of the tank body is open to form a slag discharge port for discharging honeycomb briquette-shaped materials; the crystallizer is arranged in the tank body and positioned at the upper part of the inner cavity; the bottom cover is arranged at the bottom of the tank body and can open or close the slag discharging opening, and a cooling system is arranged in the bottom cover. The vertical reduction tank can well adapt to reduction of honeycomb briquette-shaped materials.

Description

Technical Field

[0001] The present application relates to the technical field of magnesium smelting equipment, and in particular to a vertical reduction tank. Background Art

[0002] As an important structural metal material, magnesium has the advantages of low density, high specific stiffness, high specific strength, and strong damping and vibration reduction capabilities. It is widely used in various industrial and scientific fields, such as automobiles, aerospace, medical, optics, etc. Magnesium is mainly smelted and produced with magnesium ore as raw material. The most commonly used magnesium smelting method in the world is the silicon thermal method. There are many production processes for silicon thermal reduction magnesium smelting according to the different smelting furnace types. The most mature process is the Pijiang process. In the Pijiang process, the horizontal tank process is relatively mature, but the vertical tank process still has some shortcomings and needs to be supplemented and improved.

[0003] In the vertical tank reduction process, the raw materials are generally ground and pressed into pellets, which are then transported to the reduction tank. The temperature in the reduction tank slowly rises by continuously heating and vacuuming the reduction tank. When the temperature in the tank reaches the actual reaction temperature, the pellets begin to undergo a reduction reaction and eventually generate crude magnesium. Usually a reduction cycle in the reduction tank is 12 to 18 hours, but only about 2 hours of it is the time for the pellets to undergo a reduction reaction, and the rest of the time is basically the time for the pellets to heat up. The main reason for this phenomenon is the low heat transfer efficiency of the material.

[0004] There are three main ways of heat transfer: conduction, convection and radiation, and the order of heat transfer speed is radiation > convection > conduction. Radiation refers to the process of heat transfer in the form of electromagnetic waves, convection refers to the process of heat transfer through the flow of fluid (liquid or gas), and conduction refers to the process of heat transfer through the collision between molecules inside a substance. The reduction tank is continuously evacuated during heating, and the heating process of the pellets is that the reduction tank transfers heat to the pellets through thermal radiation, and the pellets are slowly heated by heat conduction inside. At present, the shape of the pellets in industry is generally oblate, the heat transfer efficiency of the pellets is low, and the heating time is long, which leads to a long overall reduction cycle, high energy consumption, and increased costs.

[0005] The raw materials are made into honeycomb briquette-like materials, and the columnar through holes in the honeycomb briquette-like materials are used as channels for the circulation of magnesium vapor, which can reduce the gaps between the pelletized particles, improve the heat transfer efficiency, and thus reduce the heating time of the reduction furnace. However, the traditional reduction tank used for the reduction of pelletized materials is not suitable for the reduction of honeycomb briquette-like materials. Therefore, it is necessary to develop a new type of reduction tank for the reduction of honeycomb briquette-like materials. Utility Model Content

[0006] Based on this, the present application provides a vertical reduction tank that can be suitable for the reduction of honeycomb briquettes.

[0007] The technical solution proposed in this application is as follows:

[0008] According to a first aspect of the present application, a vertical reduction tank is provided, comprising:

[0009] A tank body, wherein the tank body has an inner cavity for containing honeycomb briquette-like materials; the bottom of the tank body is open, forming a slag discharge port for discharging the honeycomb briquette-like materials;

[0010] a crystallizer, disposed in the tank body and located at the upper part of the inner cavity; and

[0011] The bottom cover is arranged at the bottom of the tank body, and the bottom cover can open or close the slag discharge port, and a cooling system is arranged inside the bottom cover.

[0012] In any embodiment, the diameter of the slag discharge port is equal to that of the inner cavity, and the slag discharge port is collinear with the central axis of the inner cavity.

[0013] In any embodiment, no central tube is disposed in the inner cavity.

[0014] In any embodiment, the bottom cover includes a bottom cover top plate, a bottom cover bottom plate and a bottom cover side wall, the bottom cover top plate, the bottom cover bottom plate and the bottom cover side wall together form the bottom cover, and a cooling water cavity for containing cooling water is formed in the bottom cover.

[0015] In any embodiment, a water inlet is provided at the lower portion of the bottom cover side wall, and a water outlet is provided at the upper portion of the bottom cover side wall, and both the water inlet and the water outlet are connected to the cooling water chamber, and the cooling water chamber, the water inlet and the water outlet constitute the cooling system.

[0016] In any embodiment, the top plate of the bottom cover is a flat plate, the cross-sectional area of ​​the top plate of the bottom cover is larger than the area of ​​the slag discharge port, and the top plate of the bottom cover can completely cover the slag discharge port when the bottom cover is closed.

[0017] In any embodiment, the vertical reduction tank further comprises a bottom cover connecting mechanism, the bottom cover is connected to the tank body via the bottom cover connecting mechanism, and the bottom cover can be rotated relative to the tank body to open or close the slag discharge port.

[0018] In any embodiment, the bottom cover connection mechanism is a hinge, the bottom cover is rotatably mounted on the bottom of the can body through the hinge, and a bottom cover switch for locking or opening the bottom cover is provided at the lower part of the side wall of the can body.

[0019] In any embodiment, the vertical reduction tank further comprises a sealing ring, and the sealing ring is arranged on the top plate of the bottom cover and / or the bottom of the tank body.

[0020] In any embodiment, the inner cavity of the tank body is cylindrical.

[0021] Compared with the prior art, this application has at least the following beneficial effects:

[0022] The bottom of the tank body is open, forming a slag discharge port for discharging honeycomb briquette-like materials. A bottom cover is arranged at the bottom of the tank body for opening or closing the slag discharge port, and a cooling system is arranged in the bottom cover. When the vertical reduction tank of the present application is used to reduce the honeycomb briquette-like materials, the bottom cover is made to cover the slag discharge port, and the bottom cover serves as a supporting platform for the honeycomb briquette-like materials, so that the honeycomb briquette-like materials are placed on the bottom cover for heating and reduction. After the reduction is completed, the bottom cover is opened, and the honeycomb briquette-like materials are discharged from the slag discharge port, and the slag discharge is very convenient. By arranging a cooling system in the bottom cover, the bottom cover can be cooled, and the service life of the bottom cover can be extended. The vertical reduction tank can well meet the application requirements of honeycomb briquette-like materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to better describe and illustrate the embodiments or examples provided by the present application, reference may be made to one or more drawings. The additional details or examples used to describe the drawings should not be considered as limiting the scope of the disclosed application, the embodiments or examples currently described, and any of the best modes of these applications currently understood. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0024] Figure 1 This is a schematic structural diagram of a vertical reduction tank according to an embodiment of the present application;

[0025] Figure 2 This is a schematic structural diagram of a vertical reduction tank containing honeycomb briquettes in one embodiment of the present application;

[0026] Figure 3 This is a schematic top view of the interior of a vertical reduction tank containing honeycomb briquettes in one embodiment of the present application;

[0027] Figure 4 This is a schematic structural diagram of a tank body and a crystallizer in a vertical reduction tank according to an embodiment of the present application;

[0028] Figure 5 This is a schematic diagram of the structure of a honeycomb briquetted material in a vertical reduction tank according to an embodiment of the present application;

[0029] Figure 6 This is a top view schematic diagram of a honeycomb briquette-like material in a vertical reduction tank according to an embodiment of the present application;

[0030] Figure 7 This is a schematic diagram of the connection between the bottom cover and the tank body of a vertical reduction tank in one embodiment of the present application;

[0031] Figure 8 This is an internal schematic diagram of a vertical reduction tank when the bottom cover is connected to the tank body in one embodiment of the present application.

[0032] Description of reference numerals:

[0033] 10. Vertical reduction tank; 11. Tank body; 12. Crystallizer; 13. Bottom cover; 14. Bottom cover connecting mechanism; 15. Bottom cover switch; 111. Inner cavity; 112. Slag discharge port; 131. Bottom cover top plate; 132. Bottom cover bottom plate; 133. Bottom cover side wall; 134. Cooling water cavity; 135. Water inlet; 136. Water outlet;

[0034] 100. Honeycomb briquettes;

[0035] 200. Cooling water. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0040] See also Figure 1 , Figure 2 and Figure 3 In some embodiments of the present application, a vertical reduction tank 10 is provided, and the vertical reduction tank 10 includes a tank body 11, a crystallizer 12, and a bottom cover 13. The tank body 11 is cylindrical as a whole, and has an inner cavity 111 for containing honeycomb briquette-like materials 100; the bottom of the tank body 11 is open, forming a slag discharge port 112 for discharging the honeycomb briquette-like materials 100; the crystallizer 12 is arranged at the upper part of the inner cavity 111 of the tank body 11, and is used to make the magnesium vapor generated by reduction crystallize on the crystallizer 12 to form crude magnesium; the bottom cover 13 is arranged at the bottom of the tank body 11, and the bottom cover 11 can open or cover the slag discharge port 112. When the bottom cover 11 covers the slag discharge port 112, it can carry the honeycomb briquette-like materials 100, and when the bottom cover 11 opens the slag discharge port 112, the honeycomb briquette-like materials 100 can be discharged from the slag discharge port 112; the bottom cover 13 has a cooling system for cooling the bottom cover 13.

[0041] The inner cavity 111 of the tank body 11 of the traditional vertical reduction tank 10 is usually provided with a vertically placed central tube, and the pelletized granular material is filled between the inner wall of the tank body 11 and the outer wall of the central tube, and a conical slag outlet is provided at the lower part of the tank body 11; during reduction, the central tube contacts the inner wall of the conical slag outlet to prevent the material from falling from the slag outlet; after the reduction is completed, the central tube is lifted up or lifted up to discharge the magnesium slag from the slag outlet. The diameter of the slag outlet of the vertical reduction tank 10 with this structure is usually relatively small. Although the magnesium slag of the pelletized granular material can be discharged smoothly, due to the large diameter of the honeycomb briquette-like material 100, it is impossible to discharge the slag smoothly from the slag outlet. Therefore, the traditional vertical reduction tank 10 cannot adapt well to the application requirements of honeycomb briquette-like materials.

[0042] The vertical reduction tank 10 mentioned above in the present application has an open bottom of the tank body 11 to form a slag discharge port 112 for discharging the honeycomb coal-like material 100, a bottom cover 13 is provided at the bottom of the tank body 11 for opening or covering the slag discharge port 112, and a cooling system is provided in the bottom cover 13; when the vertical reduction tank 10 is used to reduce the honeycomb coal-like material 100, the bottom cover 11 is made to cover the slag discharge port 112, at this time the bottom cover 11 can be used as a supporting platform for the honeycomb coal-like material 100, so that the honeycomb coal-like material 100 is placed on the bottom cover 11 for heating and reduction; after the reduction is completed, the bottom cover 11 is opened, thereby opening the slag discharge port 112, at this time the honeycomb coal-like material 100 will be discharged from the slag discharge port 112, so that the slag discharge of the vertical reduction tank 10 is realized, and the slag discharge is very convenient; because the bottom cover 13 needs to withstand high temperature during reduction, by providing a cooling system in the bottom cover 13, the bottom cover 13 can be cooled, thereby extending the service life of the bottom cover 13. The vertical reduction tank 10 described above can well meet the application requirements for the reduction tank when reducing the honeycomb briquettes-like material 100.

[0043] See also Figure 4 In some embodiments, the inner cavity 111 of the tank body 11 is cylindrical; the slag discharge port 112 is equal to the diameter of the inner cavity 111 of the tank body 11, and the slag discharge port 112 is collinear with the central axis of the inner cavity 111. That is, the tank body 11 is a structure with an open lower end and a cylindrical chamber inside. With such a configuration, when the vertical reduction tank 10 is used, the honeycomb briquette-like material 100 is completely placed on the bottom cover 11. After the reduction is completed, the bottom cover 11 is opened, and the slag of the honeycomb briquette-like material 100 can be quickly discharged from the tank body 11; the structure is simple and the slag discharge operation is convenient.

[0044] It should be noted that the central axis of the slag discharge port 112 refers to a straight line perpendicular to the plane where the slag discharge port 112 is located and passes through the center point of the slag discharge port 112. The central axis of the inner cavity 111 refers to a straight line extending along the longitudinal direction of the inner cavity 111 and passing through the center point of the cross section of the inner cavity 111.

[0045] In a conventional vertical reduction tank 10 for reducing pelletized particulate materials, it is usually necessary to set a vertically placed central tube in the inner cavity 111 of the tank body 11, and a plurality of air holes are provided on the side wall of the central tube for the passage of magnesium vapor; the pelletized particulate materials are loaded between the inner wall of the tank body 11 and the outer wall of the central tube, and the magnesium vapor generated by the reduction enters the central tube through the air holes on the side wall of the central tube, and then flows upward to condense and crystallize on the crystallizer to form crude magnesium.

[0046] See also Figure 5 and Figure 6The honeycomb briquette-like material 100 has a structure similar to that of honeycomb briquette, and a plurality of through holes 101 are vertically arranged inside the honeycomb briquette-like material 100; the through holes 101 can be used as a circulation channel for magnesium vapor during reduction, and can effectively promote the upward circulation of magnesium vapor in the tank body 11. When the vertical reduction tank 10 with a traditional structure is used for the reduction of the honeycomb briquette-like material 100, since the through holes 101 of the honeycomb briquette-like material 100 can be used for the circulation of magnesium vapor, the central tube is redundant. The setting of the central tube not only occupies a large space and affects the output of a single furnace, but also makes the structure of the reduction tank more complicated and affects the slag cleaning.

[0047] See also Figure 1 , Figure 2 and Figure 3 In some embodiments, no central tube is provided in the inner cavity 111 of the tank body 11. By omitting the central tube in the inner cavity 111 of the conventional vertical reduction tank 10, not only the structure of the reduction tank can be simplified, but also the single furnace output of the vertical reduction tank 10 can be effectively expanded, and the application requirements of the honeycomb briquette-like material 100 can be better met.

[0048] It should be noted that the above-mentioned honeycomb briquette-like material 100 can be obtained by adding a binder to a magnesium smelting material and forming the material into a honeycomb briquette shape through a mold or other molding equipment. Taking the Pidgeon process magnesium smelting material as an example, the raw materials of the honeycomb briquette-like material 100 include calcined dolomite, ferrosilicon with a mass fraction of 75%, fluorite and a binder.

[0049] In some specific examples, the diameter of the honeycomb coal-like material 100 is 12 cm, the height is 9 cm, the diameter of the through hole 101 is 2 cm, the volume proportion of the through hole 101 is 30%~35%, the mass of the honeycomb coal-like material 100 is 1600g~1700g, and the number of honeycomb coal-like materials 100 that can be placed in a single layer in the tank body 11 is 18.

[0050] See also Figure 1 , Figure 2 , Figure 7 and Figure 8 In some embodiments, the bottom cover 13 includes a bottom cover top plate 131, a bottom cover bottom plate 132 and a bottom cover side wall 133. The bottom cover top plate 131, the bottom cover bottom plate 132 and the bottom cover side wall 133 are enclosed together to form the bottom cover 13, and a cooling water cavity 134 for containing cooling water 200 is formed in the bottom cover 13. In this way, the bottom cover 13 is a hollow cylindrical structure enclosed by the bottom cover top plate 131, the bottom cover bottom plate 132 and the bottom cover side wall 133, wherein the interior of the bottom cover 13 is a cooling water cavity 134 for containing cooling water 200 to cool the bottom cover 13.

[0051] It is understandable that when the bottom cover 13 covers the slag discharge port 112 , the bottom cover top plate 131 in the bottom cover 13 can block the slag discharge port 112 ; and the bottom cover top plate 131 can be used as a bearing platform for placing the honeycomb briquette-like material 100 .

[0052] In some specific examples, the bottom cover top plate 131 is a flat plate, and the cross-sectional area of ​​the bottom cover top plate 131 is larger than the area of ​​the slag discharge port 112 , so that when the bottom cover 13 is closed, the bottom cover top plate 131 can completely cover the slag discharge port 112 .

[0053] See also Figure 8 In some embodiments, a water inlet 135 is provided at the lower part of the bottom cover side wall 133, and a water outlet 136 is provided at the upper part of the bottom cover side wall 133. The water inlet 135 and the water outlet 136 are both connected to the cooling water chamber 134. The cooling water chamber 134, the water inlet 135 and the water outlet 136 constitute a cooling system. By respectively providing the water inlet 135 and the water outlet 136 at the lower part and the upper part of the bottom cover side wall 133 to communicate with the cooling water chamber 134, the water inlet 135 is used to pass cooling water 200 into the cooling water chamber 134 to exchange heat with the bottom cover 13, thereby realizing the cooling of the bottom cover 13; the water outlet 136 is used to discharge the cooling water 200 after heat exchange from the cooling water chamber 134, so that the cooling water 200 can flow dynamically in the cooling water chamber 134 to improve the cooling effect.

[0054] It is understood that the cooling system may further include a cooling water circulation supply device (not shown), the water inlet 135 and the water outlet 136 are both connected to the cooling water circulation supply device, and the cooling water circulation supply device is used to introduce cooling water 200 into the water inlet 135 and receive the cooling water 200 flowing out of the water outlet 136 to form a circulating flow of cooling water 200. The cooling water circulation supply device may also include a cooler for cooling the refluxed cooling water 200.

[0055] See also Figure 7 and Figure 8 In some embodiments, the vertical reduction tank 10 further includes a bottom cover connection mechanism 14, through which the bottom cover 13 is connected to the tank body 11, and the bottom cover 13 can be rotated relative to the tank body 11 to open or close the slag discharge port 112. By rotatably connecting the bottom cover 13 to the tank body 11 through the bottom cover connection mechanism 14, the overall structure of the vertical reduction tank 10 can be made more compact, and the opening and closing operations of the bottom cover 13 can be made more convenient. Figure 7 and Figure 8 Only a part of the tank body 11 is shown, and the complete tank body 11 is not shown.

[0056] In some specific examples, the bottom cover connection mechanism 14 is a hinge, and the bottom cover 13 is rotatably mounted on the bottom of the tank body 11 through the hinge. In addition, a bottom cover switch 15 for locking or opening the bottom cover 13 is also provided at the lower part of the side wall of the tank body 11. The bottom cover 13 is rotatably mounted on the bottom of the tank body 11 through a hinge, which has a simple structure and good reliability. A bottom cover switch 15 is provided at the lower part of the side wall of the tank body 11 to lock or open the bottom cover 13; when reducing the honeycomb briquette-like material 100, the bottom cover 13 is locked through the bottom cover switch 15; when discharging slag, the bottom cover switch 15 is opened to discharge slag, which is convenient to operate.

[0057] In some embodiments, the vertical reduction tank 11 further includes a sealing ring (not shown), which is arranged on the bottom cover top plate 131 and / or the bottom of the tank body 11. The vertical reduction tank 11 needs to be operated under vacuum conditions when reducing materials. By arranging a sealing ring on the bottom cover top plate 131 and / or the bottom of the tank body 11, the bottom cover 13 and the bottom of the tank body 11 can be sealed when the bottom cover 13 is closed, thereby improving the sealing performance of the tank body 11 and facilitating the maintenance of the vacuum environment in the tank body 11 when the materials are reduced. It can be understood that the sealing ring can be made of existing heat-resistant sealing materials.

[0058] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present application. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims, and the specification and drawings may be used to interpret the contents of the claims.

Claims

1. A vertical reduction tank, characterized in that: include: A tank body, wherein the tank body has an inner cavity for containing honeycomb briquette-like materials; the bottom of the tank body is open, forming a slag discharge port for discharging the honeycomb briquette-like materials; a crystallizer, disposed in the tank body and located at the upper part of the inner cavity; and The bottom cover is arranged at the bottom of the tank body, and the bottom cover can open or close the slag discharge port, and a cooling system is arranged inside the bottom cover.

2. The vertical reduction tank according to claim 1, characterized in that: The diameter of the slag discharge port is equal to that of the inner cavity, and the slag discharge port is collinear with the central axis of the inner cavity.

3. The vertical reduction tank according to claim 1, characterized in that: No central tube is arranged in the inner cavity.

4. The vertical reduction tank according to any one of claims 1 to 3, characterized in that: The bottom cover comprises a bottom cover top plate, a bottom cover bottom plate and a bottom cover side wall. The bottom cover top plate, the bottom cover bottom plate and the bottom cover side wall are enclosed together to form the bottom cover, and a cooling water cavity for containing cooling water is formed in the bottom cover.

5. The vertical reduction tank according to claim 4, characterized in that: A water inlet is provided at the lower portion of the bottom cover side wall, and a water outlet is provided at the upper portion of the bottom cover side wall. The water inlet and the water outlet are both connected to the cooling water cavity. The cooling water cavity, the water inlet and the water outlet constitute the cooling system.

6. The vertical reduction tank according to claim 4, characterized in that: The top plate of the bottom cover is a flat plate, the cross-sectional area of ​​the top plate of the bottom cover is larger than the area of ​​the slag discharge port, and the top plate of the bottom cover can completely cover the slag discharge port when the bottom cover is closed.

7. The vertical reduction tank according to claim 4, characterized in that: The vertical reduction tank further comprises a bottom cover connecting mechanism, the bottom cover is connected to the tank body through the bottom cover connecting mechanism, and the bottom cover can be rotated relative to the tank body to open or close the slag discharge port.

8. The vertical reduction tank according to claim 4, characterized in that: The bottom cover connection mechanism is a hinge, and the bottom cover is rotatably mounted on the bottom of the tank body through the hinge. A bottom cover switch for locking or opening the bottom cover is provided at the lower part of the side wall of the tank body.

9. The vertical reduction tank according to claim 4, characterized in that: The vertical reduction tank further comprises a sealing ring, which is arranged on the top plate of the bottom cover and / or the bottom of the tank body.

10. The vertical reduction tank according to any one of claims 1 to 3 and 5 to 9, characterized in that: The inner cavity of the tank body is cylindrical.

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