WO2023245794A1

WO2023245794A1 - Magnesium vacuum crystallization tank having electromagnetic induction heating and cooling functions

Info

Publication number: WO2023245794A1
Application number: PCT/CN2022/107318
Authority: WO
Inventors: 李勇; 李长勇
Original assignee: 李勇
Priority date: 2022-06-21
Filing date: 2022-07-22
Publication date: 2023-12-28
Also published as: CN217536119U

Abstract

A magnesium vacuum crystallization tank having electromagnetic induction heating and cooling functions, comprising a crystallization tank body (1). The crystallization tank body (1) comprises an inner tank (2) and an outer tank (3); a cooling liquid jacket (5) capable of cooling the crystallization tank body (1) is provided between the inner tank (2) and the outer tank (3); inclined maze type crystallization baffles (10) are provided in the inner tank (2); a heat preservation sleeve (11) is provided on the outer wall of the outer tank (3); and a spirally wound electromagnetic induction heating coil (12) is provided on the outer side wall of the heat preservation sleeve (11). Circulating cooling liquid is introduced into the cooling liquid jacket (5), such that magnesium steam sublimated from a reduction furnace below is cooled and crystallized; and then magnesium crystals are heated and melted by means of the electromagnetic induction heating coil (12) to form magnesium ingots. The magnesium crystallization tank integrates a cooling crystallization function and an electromagnetic induction heating function, is energy-saving and environmentally friendly, greatly improves production efficiency, and has broad application prospects in the technical field of magnesium metal smelting process equipment.

Description

A magnesium vacuum crystallization tank with both electromagnetic induction heating and cooling functions

This application claims priority from the following Chinese patent applications, the entire contents of which are incorporated into this application by reference. Chinese application number: 2022215554630, Chinese application date: June 21, 2022, invention title: a magnesium vacuum crystallization tank with both electromagnetic induction heating and cooling functions.

Technical field

The invention relates to the technical field of magnesium metal smelting process equipment, in particular to a magnesium vacuum crystallization tank with both electromagnetic induction heating and cooling functions.

Background technique

In modern society, magnesium metal has been widely used due to its excellent performance and large storage capacity. Most of the production of magnesium metal in our country uses the Pidgeon method invented by an Italian, which is to heat the raw materials in the reduction tank made of heat-resistant steel, coupled with the vacuuming of the reduction tank, at temperatures up to 1200 degrees Celsius. At this time, the metallic magnesium in the raw material becomes magnesium vapor, and then condenses and crystallizes in the condensation chamber with cooling water outside, thereby realizing the smelting process from ore raw material to metallic magnesium. Pidgeon process magnesium smelting includes dolomite calcination, grinding and briquetting, vacuum thermal reduction and other processes. For the Pidgeon process, its process flow and equipment are relatively simple, plant construction investment is low, production scale is flexible, and the purity of the finished magnesium is high. It has the characteristics of high quality, small furnace body, easy construction, low technical difficulty, and can directly use resource-rich dolomite as raw material, so it has developed rapidly in our country.

The efficiency of the current magnesium crystallizing tank for producing magnesium is low and the operation is cumbersome. The operator needs to first pass magnesium vapor into the interior of the magnesium crystallizing tank for cooling, and then move the magnesium crystallizing tank to the heating operation table. When heating the magnesium crystallizing tank , it needs to be put into a furnace for heating. The cooling and heating processes of the magnesium crystallization tank need to be carried out at different operating stations. At the same time, the heating process is inconvenient to control, causing great pollution to the environment, and is not in line with the concept of environmental protection and energy saving. , and the traditional magnesium vapor has insufficient contact with the inside of the magnesium crystallization tank, resulting in poor quality of refined magnesium, low production efficiency, waste of manpower and time, high labor intensity, incomplete reaction, metal magnesium needs to be heated multiple times, and continuous automation cannot be achieved Production, for this reason, there is an urgent need for a magnesium vacuum crystallization tank with both electromagnetic induction heating and cooling functions to solve the problems of low efficiency, inconvenience to use and non-environmental protection of the current magnesium crystallization tanks for producing refined magnesium.

Contents of the invention

In order to solve the problem that the current production of magnesium in magnesium crystallization tanks has low efficiency and cumbersome operation, the heating process is inconvenient to control, causes great pollution to the environment, is not in line with the concept of environmental protection and energy saving, and the traditional magnesium vapor has insufficient contact with the inside of the magnesium crystallization tank. , resulting in poor quality of refined magnesium, low production efficiency, waste of manpower and time, high labor intensity, incomplete reaction, metal magnesium needs to be heated multiple times, and continuous automated production cannot be realized. Invent a method that combines electromagnetic induction heating and cooling Functional magnesium vacuum crystallization tank.

The technical solution of the present invention is to include a crystallizing tank body, wherein the crystallizing tank body includes an inner tank and an outer tank, a crystallizing cavity is provided on the inside of the crystallizing tank body, and a removable A cooling liquid jacket is used to cool down the main body of the crystallizing tank. The upper side of the main body of the crystallizing tank is provided with a liquid inlet pipe connected to the cooling liquid jacket. The lower side of the main body of the crystallizing tank is provided with a liquid inlet pipe connected to the cooling liquid jacket. Liquid outlet pipe, the inner tank and the outer tank are fixedly connected with a plurality of inner and outer tank connecting slats evenly distributed along the circumference of the inner tank and capable of thermal conductivity, a vacuum tube is provided on the upper side of the crystallization chamber, and a vacuum tube is provided inside the inner tank. There are a plurality of labyrinth crystallization baffles that can block magnesium vapor. The outer wall of the outer tank is provided with a thermal insulation sleeve. The outer wall of the thermal insulation sleeve is provided with a spiral electromagnetic induction heating coil. The crystallization tank The lower end of the main body is coaxially provided with a base flange.

Preferably, the coolant jacket is in a sealed state and its interior can be evacuated.

Preferably, the upper end of the electromagnetic induction heating coil is provided with a terminal block, and the terminal block is fixedly connected to the outer tank.

Preferably, the plurality of labyrinth crystallization baffles are arranged obliquely and staggeredly distributed in the crystallization cavity.

Preferably, the base flange is provided with a plurality of mounting holes evenly distributed along its circumferential direction.

Preferably, the crystallization tank body, inner and outer tank connecting slats, and base flange are all made of 310S stainless steel.

The following beneficial effects can be achieved by adopting the technical solution of the present invention: (1) A cooling liquid jacket, a liquid inlet pipe, and a liquid outlet pipe are provided. By injecting cooling liquid into the liquid inlet pipe, the main body of the crystallization tank is cooled, which is beneficial to the use of the crystallization tank. The magnesium vapor entering the crystallization chamber undergoes cooling and crystallization, and at the same time, the coolant in the coolant jacket is circulated through the liquid inlet pipe and the liquid outlet pipe; (2) Set up electromagnetic induction heating coils and connecting slats between the inner and outer tanks. By energizing the electromagnetic induction heating coil, the main body of the crystallization tank is heated. The magnesium crystals crystallized in the crystallization chamber and on the labyrinth crystal baffle melt and flow downwards out of the crystallization tank to obtain refined magnesium. The crystallization tank is heated by electromagnetic induction. , which is conducive to energy conservation and environmental protection, and has high heating efficiency. At the same time, the magnesium crystallization tank integrates cooling, crystallization and heating, which greatly improves production efficiency; (3) Set up a labyrinth crystallization baffle, and through the labyrinth crystallization baffle, the magnesium vapor During the flow process inside the inner tank, crystals are formed on the labyrinth crystallization baffle by cooling, which facilitates the crystallization of magnesium; (4) Set up a base flange, and fix the main body of the crystallization tank through the base flange to facilitate the installation of the device. Use: The technical solution of the present invention has broad application prospects in the technical field of magnesium metal smelting process equipment.

Description of the drawings

Figure 1 is an isometric view of the present invention.

Figure 2 is a front full cross-sectional isometric view of the present invention.

Figure 3 is a front half-sectional view of the present invention.

Figure 4 is a top plan view of the entire cross-section of the present invention.

Figure 5 is an enlarged view of A in Figure 2 of the present invention.

Among them, 1. Main body of the crystallization tank, 2. Inner tank, 3. Outer tank, 4. Crystallization chamber, 5. Coolant jacket, 6. Liquid inlet pipe, 7. Liquid outlet pipe, 8. Internal and external tank connecting slats, 9. Vacuum tube, 10. Labyrinth crystal baffle, 11. Insulation sleeve, 12. Electromagnetic induction heating coil, 13. Base flange, 14. Mounting hole, 15. Terminal base.

Detailed ways

The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without any creative work fall within the scope of protection of the present invention. In the description of the present invention, it should be noted that: The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on that shown in the accompanying drawings The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. .

Furthermore, the terms “first”, “second” and “third” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance in the description of the present invention. It should be noted that unless otherwise expressly stated Regulations and limitations, the terms "installation", "connection" and "connection" 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 directly connected, or it can be indirectly connected through an intermediary, or it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

As shown in Figures 1 to 5, a magnesium vacuum crystallization tank with both electromagnetic induction heating and cooling functions includes a crystallization tank body 1. A specific embodiment is that the crystallization tank body 1 includes an inner tank 2 and an outer tank. 3. There is a crystallization cavity 4 on the inside of the crystallization tank body 1, and a coolant jacket 5 that can cool down the crystallization tank body 1 is provided between the inner tank 2 and the outer tank 3. The coolant jacket 5 is in a sealed state and its The interior can be evacuated. A liquid inlet pipe 6 connected to the coolant jacket 5 is fixed on the upper side of the crystallizing tank body 1. A liquid outlet pipe 7 connected to the coolant jacket 5 is fixed on the lower side of the crystallizing tank body 1. , a plurality of labyrinth crystal baffles 10 that can block magnesium vapor are fixed in the inner tank 2;

In this embodiment, the preferred height of the crystallizing tank body 1 is 2000 mm to 2500 mm, and the more preferred height is 2500 mm. The crystallizing tank body 1 is a double-layered tank structure with a cooling liquid jacket 5 , and the crystallizing chamber 4 is provided in the crystallization chamber. In the middle of the inside of the tank body 1, magnesium vapor flows in the crystallization chamber 4 for crystallization. The upper end of the crystallization tank body 1 is opened in an arc shape to facilitate the flowing magnesium vapor to collect at the top of the crystallization chamber 4. The crystallization tank body 1 includes the inner tank 2 and the outer tank 3. The preferred thickness of the inner tank 2 and the outer tank 3 is both 10 mm to 20 mm, and the more preferred thickness is 15 mm. There is a coolant jacket 5 between the inner tank 2 and the outer tank 3, and the coolant jacket 5 is The preferred width is 30mm ~ 80mm, and the more preferred width is 50mm. The inner tank 2 and the outer tank 3 are both made of 310S stainless steel. The coolant jacket 5 between the two tanks has a coolant inlet and a coolant. In the closed space of the outlet, the coolant inlet is connected to the inlet, and the coolant outlet is connected to the outlet pipe 7. By injecting coolant into the inlet pipe 6, the coolant flows in the coolant jacket 5, thereby causing the inner tank 2 to The tank wall and the labyrinth crystallization baffle 10 are cooled down, which is conducive to the cooling and crystallization of the magnesium vapor entering the crystallization chamber 4 to form magnesium crystals. At the same time, the liquid inlet pipe 6 and the liquid outlet pipe 7 are conducive to the cooling of the cooling liquid. The cooling liquid in the jacket 5 is circulated, and a plurality of labyrinth crystal baffles 10 are arranged at a downward slope and are staggered in the crystallization chamber 4. Specifically, the labyrinth crystal baffles 10 can be staggered and welded to the crystallization chamber 4. The left and right sides of the inside, or are welded in the crystallization chamber 4 in a circumferential staggered distribution, in order to fully contact the magnesium vapor with the labyrinth crystal baffle 10, and at the same time make the magnesium vapor flow upward, which is conducive to the formation of crystallization of the magnesium vapor;

As shown in Figures 1 to 5, a magnesium vacuum crystallization tank with both electromagnetic induction heating and cooling functions is shown. A specific embodiment is that the inner tank 2 and the outer tank 3 are fixedly connected with multiple edges along the inner tank. 2. The inner and outer tanks are connected with slats 8 evenly distributed in the circumferential direction. The outer wall of the outer tank 3 is fixedly connected with an insulation sleeve 11. The outer wall of the insulation sleeve 11 is fixedly connected with a spiral electromagnetic induction heating coil 12. The lower end of the crystallization tank body 1 is coaxial. Fixed connection with base flange 13;

In this embodiment, the preferred thickness of the inner and outer tank connecting strips 8 is 25mm, the length is 50mm, and the number is 18. The inner and outer tank connecting strips 8 are made of 310S stainless steel, and are evenly distributed and welded to the inner tank 2 and the inner tank 2. Between the outer tanks 3, there is a gap between the upper end of the inner and outer tank connecting slats 8 and the crystallization tank body 1 to facilitate the flow of coolant in the coolant jacket 5, and the lower end of the inner and outer tank connecting slats 8 and the base flange 13 There is a gap between the inner and outer tank connecting slats 8 so that the lower end is higher than the upper end of the liquid outlet pipe. The preferred height of this gap is 10 mm, which facilitates the coolant to flow and be discharged through the lower side of the coolant jacket 5 through the inner and outer tank connecting plates. The strip 8 connects and fixes the inner tank 2 and the outer tank 3 to facilitate heat conduction. During specific implementation, temperature sensors can be respectively installed on the liquid inlet pipe 6 and the liquid outlet pipe 7 to monitor the cooling liquid. Temperature changes, the insulation cover 11 is made of insulating heat-resistant insulation material, specifically asbestos material can be used to facilitate the fixation of the electromagnetic induction heating coil 12, and at the same time, the electromagnetic induction heating coil 12 is separated from the crystallization tank body 1 to facilitate the use of the device ;

As shown in Figures 1 to 5, there is a magnesium vacuum crystallization tank with both electromagnetic induction heating and cooling functions. A specific embodiment is that a vacuum tube 9 is connected to the upper side of the crystallization chamber 4, and the electromagnetic induction heating coil 12 is The upper end is electrically connected to a terminal block 15, which is fixedly connected to the outer tank 3. When in use, the terminal block 15 is connected to an electromagnetic induction controller with a frequency of 16 to 30 Hz, so that the induction of the electromagnetic induction heating coil 12 is The frequency range is set to 16 to 30 Hz. By energizing the electromagnetic induction heating coil 12, the crystallizing tank body 1 is heated. The magnesium crystal crystallized in the crystallizing chamber 4 and on the labyrinth crystal baffle 10 melts and flows out of the crystallization downwards. tank to obtain refined magnesium. The crystallization tank is heated by electromagnetic induction, which is beneficial to energy conservation and environmental protection, and has high heating efficiency. At the same time, the magnesium crystallization tank integrates cooling, crystallization and heating, which greatly improves production efficiency. There are multiple openings on the base flange 13. There are installation holes 14 evenly distributed along its circumference. Specifically, the base flange 13 is provided with six bolt holes with a diameter of 55 to 66 mm. Each bolt hole is disassembled and connected with a matching fixing bolt for easy use. This device is fixedly connected to the magnesium reduction tank.

The working principle of this device is: when the device is in use, magnesium vapor is input into the crystallization tank body 1. The magnesium vapor moves inside the crystallization chamber 4 under the action of the labyrinth crystallization baffle 10, and is cooled through the liquid inlet pipe 6. The circulating coolant is injected into the liquid jacket 5, and the coolant cools the inner wall of the inner tank 2 and the labyrinth crystal baffle 10. At this time, the magnesium vapor flowing inside the inner tank 2 interacts with the inner wall of the inner tank 2 and the labyrinth crystal. The baffle 10 contacts and cooling crystallization occurs, and then the crystal is formed and fixed. After the crystal is formed, the coolant in the coolant jacket 5 is drained through the liquid outlet pipe 7 and the coolant jacket 5 is evacuated to a vacuum state. The electromagnetic heating coil 12 is energized, and the electromagnetic induction heating coil 12 heats the outer tank 3. At this time, the heat is transferred to the inner tank 2 and the labyrinth crystal baffle 10 through the inner and outer tank connecting strips 8. At this time, the crystallized magnesium melts and moves toward The downward flow flows into the magnesium ingot mold, and the use of the device is completed at this time.

The above-mentioned embodiments only express several implementation modes of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the patent of the present invention should be determined by the appended claims.

Claims

A magnesium vacuum crystallizing tank with both electromagnetic induction heating and cooling functions, including a crystallizing tank body (1), characterized in that the crystallizing tank body (1) includes an inner tank (2) and an outer tank (3), so A crystallization chamber (4) is provided inside the crystallization tank body (1), and a coolant jacket (4) that can cool down the crystallization tank body (1) is provided between the inner tank (2) and the outer tank (3). 5), the upper side of the crystallizing tank body (1) is provided with a liquid inlet pipe (6) connected to the coolant jacket (5), and the lower side of the crystallizing tank main body (1) is provided with a coolant jacket (5). The liquid outlet pipe (7) is connected with the inner tank (5). The inner tank (2) and the outer tank (3) are fixedly connected with a plurality of inner and outer tank connecting slats evenly distributed along the circumferential direction of the inner tank (2) and capable of thermal conductivity. (8), there is a gap between the lower end of the inner and outer tank connecting slats (8) and the base flange, and a vacuum tube (9) is provided on the upper side of the crystallization chamber (4). There are a plurality of labyrinth crystal baffles (10) that can block magnesium vapor. An insulation sleeve (11) is provided on the outer wall of the outer tank (3). An insulation sleeve (11) is provided on the outer wall of the insulation sleeve (11). There is a spiral electromagnetic induction heating coil (12), and a base flange (13) is coaxially provided at the lower end of the crystallizing tank body (1).
A magnesium vacuum crystallization tank with both electromagnetic induction heating and cooling functions according to claim 1, characterized in that the cooling liquid jacket (5) is in a sealed state and its interior can be evacuated.
A magnesium vacuum crystallization tank with both electromagnetic induction heating and cooling functions according to claim 1, characterized in that a terminal block (15) is provided at the upper end of the electromagnetic induction heating coil (12), and the terminal block (15) is fixedly connected to the outer tank (3).
A magnesium vacuum crystallization tank with both electromagnetic induction heating and cooling functions according to claim 1, characterized in that the plurality of labyrinth crystallization baffles (10) are arranged obliquely and staggeredly distributed in the crystallization chamber ( 4) Inside.
A magnesium vacuum crystallization tank with both electromagnetic induction heating and cooling functions according to claim 1, characterized in that the base flange (13) is provided with a plurality of mounting holes (14) evenly distributed along its circumferential direction. .
A magnesium vacuum crystallizing tank with both electromagnetic induction heating and cooling functions according to claim 1, characterized in that the crystallizing tank body (1), the inner and outer tank connecting slats (8), the base flange (13 ) are all made of 310S stainless steel.