Reduction tank system for magnesium smelting

Abstract

According to the reduction tank system for magnesium smelting, the structure of the reduction tank system for magnesium smelting is improved, so that the heating efficiency of pellets to be processed is remarkably improved. The reduction tank system for magnesium smelting comprises a plurality of tank groups, electromagnetic heating parts are arranged outside the tank groups and comprise a plurality of electromagnetic coils arranged around the tank groups, and the electromagnetic coils can be connected with or disconnected from a power supply. The electromagnetic heating part is arranged outside the tank group, and the electromagnetic heating part is additionally arranged on the basis of the original heating mode of the reduction tank system, so that the heating efficiency of the pellets to be processed can be further improved.

Description

Technical Field

[0001] This utility model relates to the field of magnesium smelting technology, specifically to a reduction tank system for magnesium smelting. Background Technology

[0002] In the global magnesium smelting industry, the silicothermic reduction process dominates. The core of this process involves mixing magnesium ore or other magnesium-rich raw materials with reducing agents such as silicon and fluorite, followed by a reduction reaction at high temperatures to produce magnesium vapor. After condensation, the magnesium vapor yields crude magnesium. The silicothermic reduction process plays a crucial role in the entire magnesium smelting process, and its efficiency and effectiveness directly affect the yield and quality of magnesium smelting.

[0003] The traditional operation of the silicothermic reduction process involves multiple steps, including grinding the raw materials, pelletizing, cooling, and loading into the reduction tank. Inside the reduction tank, the pellets are continuously heated to the reaction temperature, thus triggering the reduction reaction. However, the reduction efficiency using traditional reduction tanks is relatively low.

[0004] Therefore, improving the reduction efficiency of the reduction vessel has been a long-standing pursuit for those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a reduction tank system for magnesium smelting. By improving the structure of the reduction tank system for magnesium smelting, the heating efficiency of the pellets to be processed is significantly improved.

[0006] To achieve the above objectives, this utility model provides a reduction tank system for magnesium smelting. The reduction tank system for magnesium smelting includes several tank groups, and an electromagnetic heating unit is provided outside the tank group. The electromagnetic heating unit includes several electromagnetic coils arranged around the tank group, and the electromagnetic coils can be connected to or disconnected from a power source.

[0007] By installing an electromagnetic heating element outside the tank assembly, the heating efficiency of the pellets to be processed can be further improved, in addition to the original heating method of the reduction tank system.

[0008] Optionally, each of the tank groups includes a magnetic shield and at least two reduction tanks. Each reduction tank includes a tank body and a central cylinder coaxially disposed with the tank body. The central cylinder is located inside the tank body. The space between the central cylinder and the tank body is used to accommodate the pellets to be processed. Both the tank body and the central cylinder are made of conductive material. The magnetic shield is disposed between two adjacent reduction tanks belonging to the same tank group. The magnetic shield is located inside the electromagnetic heating section.

[0009] By adopting the technical solution of this application, multiple tanks can be combined into a tank group and surrounded by an electromagnetic coil. Adjacent reduction tanks are separated by a magnetic shield. After the pellets to be processed are loaded into multiple reduction tanks, the inductive coupling coil is energized, so that each reduction tank in the same tank group is in an alternating magnetic field, thereby increasing the heating efficiency of the reduction tank and further improving the heating efficiency of the pellets to be processed.

[0010] Optionally, the magnetic shielding element is a vertically extending plate-like structure.

[0011] Optionally, the system includes two magnetic shielding elements arranged in a cross shape to form four receiving areas, each receiving area containing a reduction vessel.

[0012] Optionally, the device includes two magnetic shielding members arranged in a T-shape to form three receiving areas, each receiving area containing a reduction vessel.

[0013] A magnesium smelting reduction tank system includes a tank group comprising a single reduction tank. Each reduction tank includes a tank body and a central cylinder coaxially arranged with the tank body, the central cylinder being located within the tank body. The space between the central cylinder and the tank body is used to accommodate pellets to be processed. An electromagnetic heating unit is also provided outside the tank body, the electromagnetic heating unit including a plurality of electromagnetic coils arranged around the tank body, the electromagnetic coils being capable of being connected to or disconnected from a power source.

[0014] By adopting the magnesium reduction tank system in this technical solution, an electromagnetic coil is added to the original heating method of the tank body. After the electromagnetic coil is energized, an induced current is generated between the central cylinder and the tank body, which in turn raises the temperature. This allows the pellets to be processed to be heated from both the inside and outside, significantly improving the heating efficiency of the pellets to be processed.

[0015] Optionally, a slag discharge channel is also provided at the bottom of the tank body, and the slag discharge channel is connected to the interior of the central cylinder.

[0016] Optionally, the reduction tank system is further provided with a crystallization section, which is covered on the upper side of the central cylinder.

[0017] Optionally, the crystallized portion has a trapezoidal structure including a large-diameter end and a small-diameter end that are axially opposite each other, wherein the large-diameter end is closer to the top of the central cylinder than the small-diameter end.

[0018] Optionally, the sidewall of the central cylinder is provided with a plurality of air passages, which extend radially along the central cylinder and penetrate the wall of the central cylinder;

[0019] The interior of the central cylinder is connected to the exterior of the central cylinder through the air passage.

[0020] Optionally, the highest point of the electromagnetic coil in the height direction is lower than the upper end face of the central cylinder.

[0021] Optionally, the central cylinder is detachably connected to the bottom of the tank body.

[0022] Optionally, the bottom of the can body is funnel-shaped.

[0023] Optionally, the central cylinder has a constant diameter structure.

[0024] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0026] Figure 1 This is one of the structural schematic diagrams of the reduction tank system in this utility model embodiment;

[0027] Figure 2 This is a partial structural diagram of the reduction tank system in an embodiment of the present invention, with the electromagnetic coil omitted;

[0028] Figure 3 This is a schematic diagram of the magnetic field generated by the electromagnetic coil of this utility model;

[0029] Figure 4 for Figure 1 Structural diagram;

[0030] Figure 5 This is a second schematic diagram of the reduction tank system in an embodiment of this utility model.

[0031] Figure 6 This is a schematic diagram of the reduction tank system in an embodiment of this utility model, part three;

[0032] Figure 7 This is a schematic diagram of the reduction tank system in an embodiment of this utility model, part four;

[0033] Figure 8 This is a schematic diagram of the reduction tank system in an embodiment of the present invention, part five;

[0034] Figure 9 for Figure 6 The three-dimensional schematic diagram shows that the electromagnetic coil is only for illustration and its size does not constitute a limitation of this patent.

[0035] Figure label:

[0036] 1000-Reduction tank system; 10-Tank group; 1-Reduction tank; 2-Magnetic shielding component; 100-Tank body; 200-Central cylinder; 300-Pellet to be processed; 400-Electromagnetic heating section; 500-Power supply; 600-Slag discharge channel; 700-Crystallization section; 800-Gas passage; 900-Wire. Detailed Implementation

[0037] This invention provides a reduction tank system for magnesium smelting. An electromagnetic coil is installed on the surface of the tank body. During the reduction process, energizing the coil induces a current in the outer and central cylinders, thereby simultaneously heating the ore pellets through the outer and central cylinders. This method reduces heat loss during heat transfer, thereby improving heating efficiency, shortening the reduction cycle, and increasing production efficiency.

[0038] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0040] In the global magnesium smelting industry, the silicothermic reduction process dominates. The core of this process involves mixing magnesium ore or other magnesium-rich raw materials with reducing agents such as silicon and fluorite, followed by a reduction reaction at high temperatures to produce magnesium vapor. After condensation, the magnesium vapor yields crude magnesium. The silicothermic reduction process plays a crucial role in the entire magnesium smelting process, and its efficiency and effectiveness directly affect the yield and quality of magnesium smelting.

[0041] The traditional operation of the silicothermic reduction process involves multiple steps, including grinding the raw materials, pelletizing, cooling, and loading into the reduction tank. Inside the reduction tank, the pellets are continuously heated to the reaction temperature, thereby triggering the reduction reaction.

[0042] The traditional operation of the silicothermic reduction process involves multiple steps, including grinding the raw materials, pelletizing, cooling, and loading into the reduction tank. Inside the reduction tank, the pellets are continuously heated to the reaction temperature, triggering the reduction reaction. However, a complete reduction cycle using a traditional reduction tank often takes 12 to 18 hours (depending on the type of tank, such as horizontal or vertical). During this lengthy cycle, the actual time used for the reduction reaction is relatively short, with most of the time spent heating the pellets to the required reaction temperature.

[0043] This is because the heat for heating in traditional reduction tanks mainly comes from gas combustion, and the heat is transferred to the pellets inside the tank through the tank wall, resulting in slow heating of the pellets. This heat transfer method is inefficient and seriously affects the production efficiency of magnesium smelting.

[0044] Please refer to Figures 1 to 9 , Figure 1 This is one of the structural schematic diagrams of the reduction tank system in this utility model embodiment; Figure 2 This is a partial structural diagram of the reduction tank system in an embodiment of the present invention, with the electromagnetic coil omitted; Figure 3 This is a schematic diagram of the magnetic field generated by the electromagnetic coil of this utility model; Figure 4 for Figure 1 Structural diagram; Figure 5 This is a second schematic diagram of the reduction tank system in an embodiment of this utility model. Figure 6 This is a schematic diagram of the reduction tank system in an embodiment of this utility model, part three; Figure 7 This is a schematic diagram of the reduction tank system in an embodiment of this utility model, part four; Figure 8 This is a schematic diagram of the reduction tank system in an embodiment of the present invention, part five; Figure 9 for Figure 6 The three-dimensional schematic diagram shows that the electromagnetic coil is only for illustration and its size does not constitute a limitation of this patent.

[0045] like Figure 1 and Figure 2 As shown, this utility model provides a magnesium smelting reduction tank system 1000, which includes several tank groups 10. An electromagnetic heating unit 400 is disposed outside each tank group 10. The electromagnetic heating unit 400 includes several electromagnetic coils arranged around the tank group 10, and the electromagnetic coils can be connected or disconnected from a power supply 500. By providing the electromagnetic heating unit 400 outside the tank group 10, the heating efficiency of the pellets 300 to be processed can be further improved, in addition to the original heating method of the reduction tank system 1000.

[0046] Specifically, each reduction tank 1 includes a tank body 100 and a central cylinder 200 coaxially arranged with the tank body 100. The tank body 100 is placed vertically, that is, the axial direction of the tank body 100 extends vertically. The central cylinder 200 is built into the tank body 100. The central cylinder 200 is a tubular structure with openings at the top and bottom. The central axis of the central cylinder 200 coincides with the central axis of the tank body 100. The space between the central cylinder 200 and the tank body 100 is used to accommodate the pellets 300 to be processed.

[0047] like Figure 3As shown, the tank body 100 is the main area used for magnesium smelting and reduction. Both the tank body 100 and the central cylinder 200 are made of conductive materials. For example, the main material of the tank body 100 is ZG3Cr. 24 The Ni7RE tank body 100 has a central cylinder 200 inside and an electromagnetic coil on its outer surface. The high-demand working environment of the tank body 100 requires it to have good high-temperature oxidation resistance, corrosion resistance, as well as sufficient high-temperature strength and comprehensive mechanical properties.

[0048] The central cylinder 200 is used to facilitate the escape of magnesium vapor generated during the reduction reaction of the pellets, and to facilitate the discharge of slag from the main body 100 after the reaction. The main material of the central cylinder 200 is the same as that of the main body 100, namely ZG3Cr. 24 Ni7RE. Specifically, the side wall of the central cylinder 200 is provided with several air passages 800, which extend radially along the central cylinder 200 and penetrate the wall of the central cylinder 200. The interior of the central cylinder 200 is connected to the exterior of the central cylinder 200 through the air passages 800, thereby facilitating the escape of magnesium vapor from the air passages 800.

[0049] After the pellets 300 to be processed are loaded into the can body 100, the power supply 500 is connected to supply alternating current to the electromagnetic coil, thereby generating an alternating magnetic field on the surface of the can body 100. At this time, the can body 100 and the central cylinder 200 cut the alternating magnetic field lines to generate an alternating current (i.e., eddy current). The eddy current causes the charge carriers of the can body 100 and the central cylinder 200 to move at high speed and randomly. The charge carriers collide and rub against each other with the atoms to generate heat energy.

[0050] By adopting the magnesium reduction tank system 1000 in this technical solution, an electromagnetic coil is added to the original heating method of the tank body 100. After the electromagnetic coil is energized, an induced current is generated between the central cylinder 200 and the tank body 100, which in turn raises the temperature. This allows the pellets to be processed to be heated from both the inside and outside of the pellets, which significantly improves the heating efficiency of the pellets to be processed 300.

[0051] By providing an electromagnetic heating element 400 on the outside of the tank assembly 10, the central cylinder 200 and the tank body 100 can generate heat together under the action of the electromagnetic coil, thereby improving the heating efficiency of the pellets 300 to be processed.

[0052] In the example shown, the central cylinder 200 is detachably connected to the bottom of the tank body 100. A slag discharge channel 600 is also provided at the bottom of the tank body 100, and the slag discharge channel 600 is connected to the interior of the central cylinder 200. The central cylinder 200 has a uniform diameter structure. The bottom of the tank body 100 has a funnel-shaped structure. The slag discharge channel 600 is located at the smaller diameter end of the funnel-shaped structure, and the larger diameter end of the funnel-shaped structure is located above the smaller diameter end. When discharging slag to the outside, after lifting the central cylinder 200, the waste material can be discharged outward from the discharge channel.

[0053] In the above-described embodiment, the reduction tank system 1000 further includes a crystallization section 700, which is positioned above the central cylinder 200. The crystallization section 700 collects magnesium vapor generated within the tank body 100. The magnesium vapor generated after the raw materials react within the tank body 100 enters the crystallization section 700 and is condensed to form crude magnesium. The crystallization section 700 has a trapezoidal structure, including a large-diameter end and a small-diameter end axially opposite each other. The large-diameter end is closer to the top of the central cylinder 200 than the small-diameter end. This improves the magnesium vapor collection efficiency.

[0054] The following describes the specific usage process of the 1000 reduction tank system.

[0055] In this scheme, the silicothermic magnesium smelting process is adopted. The central cylinder 200 is placed inside the tank body 100, and the pellets to be processed 300 are added between the tank body 100 and the central cylinder 200. The crystallization section 700 is installed on the upper part of the tank body 100, and the tank opening is sealed. The control power supply 500 is turned on, and electricity is supplied to the electromagnetic coil. The electromagnetic coil generates an induced magnetic field, which induces a current in the outer cylinder of the tank body 100 and the central cylinder 200, thereby generating heat. This heats the pellets simultaneously from both the outside and inside, improving heating efficiency and shortening the reduction cycle. The precipitated magnesium vapor escapes from the gas passage 800 and diffuses upwards. Upon reaching the crystallization section 700, the magnesium vapor begins to condense, forming crude magnesium.

[0056] The above-described embodiments also include the operation of evacuating the tank body 100, which is prior art and will not be described in detail here.

[0057] The following two more detailed embodiments further illustrate the technical solution of this application. It should be noted that these two embodiments are for illustrative purposes only and are not intended to limit the scope of the technical solution of this application. Those skilled in the art can combine the following two embodiments with the previous embodiments in part or in whole, and all technical solutions derived from such combinations fall within the protection scope of this patent.

[0058] Example 1

[0059] like Figures 1 to 4As shown, in this embodiment, each tank group 10 includes a single reduction tank 1, and the single reduction tank 1 is set up independently in a group.

[0060] In this embodiment, the electromagnetic heating unit 400 is disposed outside the tank body 100. The electromagnetic heating unit 400 includes a plurality of electromagnetic coils surrounding the outside of the tank body 100. The electromagnetic coils can be connected to or disconnected from the power supply 500. The electromagnetic coils are disposed around the outside of the tank body 100 and are spirally wound into a plurality of turns along the extension direction of the central axis. They are connected to the power supply 500 through a wire 900. The wire 900 is also connected to a switch, thereby realizing the connection or disconnection of the electromagnetic coils from the power supply 500.

[0061] The electromagnetic coil has its highest point in the vertical direction lower than the upper surface of the central cylinder 200. This allows heating of the portion filled with pellets, while leaving the rest of the tank body 100 and the central cylinder 200 unheated.

[0062] The following is a comparative example of using the reduction tank system 1000 in this embodiment to perform a reduction operation on the pellets 300 to be processed.

[0063] Comparative Example 1

[0064] First, take a certain amount of calcined dolomite, 75% ferrosilicon, and fluorite. The calcined dolomite and 75% ferrosilicon have a particle size of 80 mesh, and the fluorite has a particle size of 200 mesh. Mix the raw materials evenly in a ratio of calcined dolomite:75% ferrosilicon:fluorite = 100:22:3 to obtain the raw material. The chemical composition of the calcined dolomite is: MgO: 38-40%, CaO: 55-60%, K₂O + Na₂O ≤ 0.2%.

[0065] Second, the above raw materials are made into flat spherical pellets 300 by using molds or other molding equipment. The molding pressure of the pellets is 20MPa, and the density of the pellets after pressing is 1.70g / cm3.

[0066] Third, place the prepared pellets 300 into the tank body 100 (e.g. Figure 1 , Figure 3 As shown, the specific dimensions of the tank body 100 are φ0.63m × 4.0m.

[0067] Fourth, the tank body was heated from 100°C to 1250°C using conventional heating methods, the vacuum inside the tank was controlled at 1 Pa, the heating and reduction time was controlled at 8 hours, and the magnesium ratio of the material was recorded.

[0068] Fifth, repeat the above steps twice.

[0069] The operation results are shown in the table below:

[0070]

[0071] Therefore, it can be seen that by adopting the technical solution of this application, the heating and reduction time is greatly shortened, and the reduction and smelting of magnesium can be completed in only 8 hours.

[0072] Comparative Example 2

[0073] First, take a certain amount of calcined dolomite, 75% ferrosilicon, and fluorite, respectively. The particle size of the calcined dolomite and 75% ferrosilicon is 80 mesh, and the particle size of the fluorite is 200 mesh. Mix the raw materials evenly in a ratio of calcined dolomite:75% ferrosilicon:fluorite = 100:22:3 to obtain the magnesium smelting raw material. The chemical composition of the calcined dolomite is: MgO: 38-40%, CaO: 55-60%, K2O + Na2O ≤ 0.2%.

[0074] Second, the above raw materials are made into flat spherical pellets 300 by using molds or other molding equipment. The molding pressure is 20MPa, and the density of the pellets after pressing is 1.70g / cm3.

[0075] Third, place the prepared pellets 300 into the tank body 100 (see...) Figure 1 , Figure 3 As shown), the specific dimensions of the tank body 100 are φ0.63×4.0m.

[0076] Fourth, the electromagnetic coil parameters selected for this operation are as follows: frequency 50kHz, power 15kW, coil turns 60, power supply 500 (380V industrial power supply), and coil diameter 25mm.

[0077] Fifth, using the method of this utility model, the temperature of the can body 100 is raised to 1250 degrees by means of an electromagnetic coil, the vacuum degree inside the can is controlled to 1 Pa, the heating and reduction time is controlled to 8 hours, and the operation data is recorded.

[0078] Sixth, repeat the above operation twice.

[0079] The operation results are shown in the table below:

[0080]

[0081] Comparative Example 3

[0082] First, take a certain amount of calcined dolomite, 75% ferrosilicon, and fluorite respectively. The particle size of the calcined dolomite and 75% ferrosilicon is 80 mesh, and the particle size of the fluorite is 200 mesh. Mix the raw materials evenly in a ratio of calcined dolomite:75% ferrosilicon:fluorite = 100:22:3 to obtain magnesium smelting raw material. The chemical composition of the calcined dolomite is: MgO: 38-40%, CaO: 55-60%, K2O+Na2O≤0.2%.

[0083] Second, the above raw materials are made into flat spherical pellets 300 by using molds or other molding equipment. The molding pressure is 20MPa, and the density of the pellets after pressing is 1.70g / cm3.

[0084] Third, place the prepared pellets 300 into the tank body 100 (see...) Figure 1 , Figure 3 As shown), the specific dimensions of the tank body 100 are φ0.63×4.0m.

[0085] Fourth, the electromagnetic coil parameters selected for this operation are as follows: frequency 50kHz, power 15kW, coil turns 80, power supply 500 industrial power supply 380V, and coil diameter 25mm.

[0086] Fifth, using the method of this utility model, the temperature of the can body 100 is raised to 1250 degrees by means of an electromagnetic coil, the vacuum degree inside the can is controlled to 1 Pa, the heating and reduction time is controlled to 8 hours, and the operation data is recorded.

[0087] Sixth, repeat the above operation twice.

[0088] The operation results are shown in the table below:

[0089]

[0090] Comparative Example 4

[0091] First, a certain amount of calcined dolomite, 75% ferrosilicon, and fluorite were taken separately. The particle size of the calcined dolomite and 75% ferrosilicon was 80 mesh, and the particle size of the fluorite was 200 mesh. The raw materials were uniformly mixed in a ratio of calcined dolomite:75% ferrosilicon:fluorite = 100:22:3 to obtain magnesium smelting raw material. The chemical composition of the calcined dolomite was: MgO: 38-40%, CaO: 55-60%, K2O + Na2O ≤ 0.2%.

[0092] Second, the above raw materials are made into flat spherical pellets 300 by using molds or other molding equipment. The molding pressure is 20MPa, and the density of the pellets after pressing is 1.70g / cm3.

[0093] Third, place the prepared pellets 300 into the tank body 100 (see...) Figure 1 , Figure 3 As shown), the specific dimensions of the tank body 100 are φ0.63×4.0m.

[0094] Fourth, the electromagnetic coil parameters selected for this operation are as follows: frequency 50kHz, power 15kW, coil turns 100, power supply 500 industrial power supply 380V, and coil diameter 25mm.

[0095] Fifth, using the method of this utility model, the temperature of the can body 100 is raised to 1250 degrees by means of an electromagnetic coil, the vacuum degree inside the can is controlled to 1 Pa, the heating and reduction time is controlled to 8 hours, and the operation data is recorded.

[0096] Sixth, repeat the above operation twice.

[0097] The operation results are shown in the table below:

[0098]

[0099] The above four comparative examples demonstrate that when using the technical solution of this application, the heating and reduction time can be significantly shortened, thereby greatly improving the magnesium smelting efficiency.

[0100] Furthermore, according to Examples 2, 3, and 4, it can be determined that, with other parameters remaining constant, the more turns of the electromagnetic coil, the lower the magnesium-to-material ratio. This indicates that more turns result in a shorter heating time, a longer reduction time, and a higher degree of reduction reaction of the raw materials. Here, the magnesium-to-material ratio refers to the mass of the pellets to be processed (300) relative to the mass of the refined magnesium.

[0101] Example 2

[0102] Compared with Example 1, the biggest difference between Example 2 and Example 1 is that in Example 2, the number of reduction tanks 1 in each tank group 10 is not one, but two or more.

[0103] like Figures 5 to 8 As shown, each tank group 10 includes a magnetic shielding element 2 and at least two reduction tanks 1. Each reduction tank 1 includes a tank body 100 and a central cylinder 200 coaxially arranged with the tank body 100. The central cylinder 200 is located inside the tank body 100. The space between the central cylinder 200 and the tank body 100 is used to accommodate the pellets 300 to be processed. Both the tank body 100 and the central cylinder 200 are made of conductive material. A magnetic shielding element 2 is provided between two adjacent reduction tanks 1 belonging to the same tank group 10. The magnetic shielding elements 2 are all located inside the electromagnetic heating section 400.

[0104] The magnetic shielding component 2 is a vertically extending plate-like structure. The magnetic shielding component 2 is made of a magnetic shielding material, such as silicon steel, or other magnetic shielding materials, which can be selected by those skilled in the art. The magnetic shielding component 2 is used to reduce electromagnetic interference. Plate-like silicon steel sheet partitions are installed between adjacent reduction tanks 1 as magnetic shielding components 2, and their thickness can be 1-2 mm.

[0105] Of course, some electromagnetic interference can also be canceled out by adjusting the current phase of the electromagnetic coil.

[0106] By setting up a magnetic shield 2 and an electromagnetic heating unit 400, multiple reduction tanks 1 can be heated simultaneously, further improving the overall reduction efficiency of the reduction tank system 1000.

[0107] In a specific example, such as Figure 6 As shown, each tank group 10 includes two magnetic shielding components 2, which form a cross-shaped structure to create four containment areas, and a reduction tank 1 is installed in each containment area.

[0108] Of course, such as Figure 5 As shown, each tank group 10 may also include two magnetic shielding components 2, which are arranged in a T-shape to form three containment areas, and a reduction tank 1 is provided in each containment area.

[0109] Of course, it can also be like Figure 8 In the example shown, three magnetic shields 2 are provided, which are connected horizontally and vertically to form six accommodating areas. In addition, more magnetic shields 2 can be provided to form more accommodating areas, which can be selected by those skilled in the art.

[0110] By adopting the technical solution of this application, multiple tank groups 10 can be combined into one tank group 10 and surrounded by an electromagnetic coil. Adjacent reduction tanks 1 are separated by a magnetic shield 2. After the pellets 300 to be processed are loaded into multiple reduction tanks 1, the inductive coupling coil is energized, so that each reduction tank 1 located in the same tank group 10 is in an alternating magnetic field, thereby increasing the heating efficiency of the reduction tank 1 and further improving the heating efficiency of the pellets 300 to be processed.

[0111] As an alternative approach, the power of the electromagnetic coil can be adjusted after the temperature of each reduction tank 1 is obtained to achieve intelligent temperature control. For example, for a newly started reduction tank 1, 70% of the power can be provided to the electromagnetic coil to achieve rapid heating, while for a reduction tank 1 that has reached a certain temperature threshold, 30% of the power can be provided to maintain the set temperature, thereby achieving heat preservation.

[0112] The following is a comparative example of using the reduction tank system 1000 in this embodiment to perform a reduction operation on the pellets 300 to be processed.

[0113] Comparative Example 1

[0114] First, take a certain amount of calcined dolomite, 75% ferrosilicon, and fluorite, respectively. The particle size of the calcined dolomite and 75% ferrosilicon is 80 mesh, and the particle size of the fluorite is 200 mesh. Mix the raw materials evenly in a ratio of calcined dolomite:75% ferrosilicon:fluorite = 100:22:3 to obtain the magnesium smelting raw material. The chemical composition of the calcined dolomite is: MgO: 38-40%, CaO: 55-60%, K2O + Na2O ≤ 0.2%.

[0115] Second, the above raw materials are formed into flat spherical pellets using molds or other molding equipment. The molding pressure is 20 MPa, and the density of the material after pressing is 1.70 g / cm3.

[0116] Third, place the prepared pellets into reduction tank 1 (see Figure 1 As shown), the specific dimensions are: reduction tank 1φ0.63×4.0m.

[0117] Fourth, the reduction vessel 1 was heated to 1250 degrees Celsius using conventional heating methods, the vacuum level inside the vessel was controlled at 1 Pa, the heating and reduction time was controlled at 8 hours, and the operation data was recorded.

[0118] Fifth, repeat the above operation 3 times.

[0119] The operation results are shown in the table below:

[0120]

[0121] Comparative Example 2

[0122] First, take a certain amount of calcined dolomite, 75% ferrosilicon, and fluorite, respectively. The particle size of the calcined dolomite and 75% ferrosilicon is 80 mesh, and the particle size of the fluorite is 200 mesh. Mix the raw materials evenly in a ratio of calcined dolomite:75% ferrosilicon:fluorite = 100:22:3 to obtain the magnesium smelting raw material. The chemical composition of the calcined dolomite is: MgO: 38-40%, CaO: 55-60%, K2O + Na2O ≤ 0.2%.

[0123] Second, the above raw materials are formed into flat spherical pellets using molds or other molding equipment. The molding pressure is 20 MPa, and the density of the material after pressing is 1.70 g / cm3.

[0124] Third, the prepared pellets are evenly placed into four reduction tanks 1 (see...) Figure 1 , Figure 3 As shown), the reduction tank 1 is located in the same inductively coupled coil. The specific dimensions of the reduction tank 1 are: reduction tank 1 φ0.63×4.0m.

[0125] Fourth, the parameters for the inductively coupled coil in this operation: toroidal coil (see...) Figure 2 , Figure 3 As shown), the frequency is 20kHz, the power of a single coil is 60kW, and the current is 500A (480V).

[0126] Fifth, using the method of this utility model, the reduction tank 1 is heated to 1250 degrees Celsius through an inductive coupling coil, the vacuum degree inside the tank is controlled to be 1 Pa, the heating and reduction time is controlled to be 8 hours, and the operation data is recorded.

[0127] The operation results are shown in the table below:

[0128]

[0129] Comparative Example 3

[0130] First, take a certain amount of calcined dolomite, 75% ferrosilicon, and fluorite, respectively. The particle size of the calcined dolomite and 75% ferrosilicon is 80 mesh, and the particle size of the fluorite is 200 mesh. Mix the raw materials evenly in a ratio of calcined dolomite:75% ferrosilicon:fluorite = 100:22:3 to obtain the magnesium smelting raw material. The chemical composition of the calcined dolomite is: MgO: 38-40%, CaO: 55-60%, K2O + Na2O ≤ 0.2%.

[0131] Second, the above raw materials are formed into flat spherical pellets using molds or other molding equipment. The molding pressure is 20 MPa, and the density of the material after pressing is 1.70 g / cm3.

[0132] Third, the prepared pellets are evenly placed into four reduction tanks 1 (see...) Figure 1 , Figure 3 As shown), the reduction tank 1 is located in the same inductively coupled coil. The specific dimensions of the reduction tank 1 are: reduction tank 1 φ0.63×4.0m.

[0133] Fourth, the parameters for the inductively coupled coil in this operation: toroidal coil (see...) Figure 2 , Figure 3 As shown), the frequency is 20kHz, the power of a single coil is 60kW, and the current is 500A (480V).

[0134] Fifth, using the method of this utility model, the reduction tank 1 is heated to 1250 degrees Celsius through an inductive coupling coil, the vacuum degree inside the tank is controlled to be 1 Pa, the heating and reduction time is controlled to be 8 hours, and the operation data is recorded.

[0135] The operation results are shown in the table below:

[0136]

[0137] Comparative Example 4

[0138] First, take a certain amount of calcined dolomite, 75% ferrosilicon, and fluorite, respectively. The particle size of the calcined dolomite and 75% ferrosilicon is 80 mesh, and the particle size of the fluorite is 200 mesh. Mix the raw materials evenly in a ratio of calcined dolomite:75% ferrosilicon:fluorite = 100:22:3 to obtain the magnesium smelting raw material. The chemical composition of the calcined dolomite is: MgO: 38-40%, CaO: 55-60%, K2O + Na2O ≤ 0.2%.

[0139] Second, the above raw materials are formed into flat spherical pellets using molds or other molding equipment. The molding pressure is 20 MPa, and the density of the material after pressing is 1.70 g / cm3.

[0140] Third, the prepared pellets are evenly placed into four reduction tanks 1 (see...) Figure 1 , Figure 3 As shown), the reduction tank 1 is located in the same inductively coupled coil. The specific dimensions of the reduction tank 1 are: reduction tank 1 φ0.63×4.0m.

[0141] Fourth, the parameters for the inductively coupled coil in this operation: toroidal coil (see...) Figure 2 , Figure 3 As shown), the frequency is 20kHz, the power of a single coil is 60kW, and the current is 500A (480V).

[0142] Fifth, using the method of this utility model, the reduction tank 1 is heated to 1250 degrees Celsius through an inductive coupling coil, the vacuum degree inside the tank is controlled to be 1 Pa, the heating and reduction time is controlled to be 8 hours, and the operation data is recorded.

[0143] The operation results are shown in the table below:

[0144]

[0145] The data above shows that the more turns there are, the greater the total power and the lower the magnesium ratio. This indicates that the more turns there are, the greater the power, the shorter the heating time, the longer the reduction time, and the higher the degree of reduction reaction of the raw materials. This proves that the heating efficiency of the electromagnetic induction heating of this invention is greater than that of conventional heating.

[0146] Compared with existing technologies, the advantages of this application are:

[0147] First, the heating efficiency is high. In this application, the tank body 100 and the central cylinder 200 generate heat themselves. Under the action of the magnetic field, the surface of the tank body 100 generates an induced current, which can directly heat the pellets inside the tank, reducing heat loss in the heat transfer process, so the heat conversion rate is high.

[0148] By adopting the magnesium reduction tank system 1000 of one embodiment of this application, an electromagnetic coil is added to the original heating method of the tank body 100. After the electromagnetic coil is energized, an induced current is generated between the central cylinder 200 and the tank body 100, thereby increasing the temperature. This allows the inner and outer sides of the pellets to be processed to be heated together, which significantly improves the heating efficiency of the pellets to be processed 300.

[0149] By adopting the technical solution of Embodiment 2 in this application, multiple reduction tanks 1 can be combined into a tank group 10 and surrounded by an electromagnetic coil. Adjacent reduction tanks 1 are separated by a magnetic shield 2. After the pellets 300 to be processed are loaded into multiple reduction tanks 1, the inductive coupling coil is energized, so that each reduction tank 1 located in the same tank group 10 is in an alternating magnetic field, thereby increasing the heating efficiency of the reduction tank 1 and further improving the heating efficiency of the pellets 300 to be processed.

[0150] Secondly, the pellets themselves can generate heat because the pellets contain ferrosilicon, which is evenly distributed within the pellets of the tank body 100. The ferrosilicon composition consists of 75% silicon, iron oxides, and a small amount of other impurities. Under the influence of a magnetic field, a small amount of induced current will also be generated in the ferrosilicon, thus the ferrosilicon in the pellets will also become a heat source, thereby heating the tank body 100 and the central cylinder 200.

[0151] Third, the temperature control function: This utility model can accurately adjust the temperature throughout the heating and reduction process to prevent excessive temperature fluctuations, so that the pellets to be processed 300 can be reduced in a more stable temperature range, thereby making the reduction reaction more complete, reducing the generation of impurities, and improving the purity of metallic magnesium.

[0152] Fourth, this utility model is more energy-efficient than traditional combustion methods. There are no combustion products during the heating process, which reduces the emission of harmful gases, and it can use green energy to save costs.

[0153] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A reduction tank system for magnesium smelting, characterized in that, The system includes several tank groups (10), each tank group (10) having an electromagnetic heating unit (400) on its exterior. The electromagnetic heating unit (400) includes several electromagnetic coils arranged around the tank group (10), and the electromagnetic coils can be connected or disconnected from a power source (500). Each tank group (10) includes a magnetic shield (2) and at least two reduction tanks (1). Each reduction tank (1) includes a tank body (100) and a central cylinder (200) coaxially arranged with the tank body (100). The central cylinder (200) is located inside the tank body (100). The space between the central cylinder (200) and the tank body (100) is used to accommodate the pellets (300) to be processed. Both the tank body (100) and the central cylinder (200) are made of conductive material. The magnetic shielding element (2) is provided between two adjacent reduction tanks (1) belonging to the same tank group (10), and the magnetic shielding element (2) is located inside the electromagnetic heating part (400).

2. The magnesium smelting reduction tank system according to claim 1, characterized in that, The magnetic shielding component (2) is an extended plate-like structure.

3. The magnesium smelting reduction tank system according to claim 1, characterized in that, Each of the tank groups (10) includes two magnetic shielding members (2), which form a cross-shaped structure to form four accommodating areas, and each accommodating area is provided with a reduction tank (1).

4. The magnesium smelting reduction tank system according to claim 1, characterized in that, Each of the tank groups (10) includes two magnetic shielding members (2), which are arranged in a T-shape to form three accommodating areas, and each accommodating area is provided with a reduction tank (1).

5. The magnesium smelting reduction tank system according to claim 1, characterized in that, Each of the tank groups (10) includes a single reduction tank (1), and each reduction tank (1) includes a tank body (100) and a central cylinder (200) coaxially arranged with the tank body (100), and the central cylinder (200) is located inside the tank body (100); An electromagnetic heating unit (400) is also provided on the outside of the tank body (100). The electromagnetic heating unit (400) includes a plurality of electromagnetic coils arranged around the tank body (100). The electromagnetic coils can be connected to or disconnected from the power supply (500).

6. The magnesium smelting reduction tank system according to any one of claims 1-5, characterized in that, The bottom of the tank body (100) is also provided with a slag discharge channel (600), which is connected to the interior of the central cylinder (200).

7. The magnesium smelting reduction tank system according to claim 6, characterized in that, The central cylinder (200) has a plurality of air passages (800), which extend radially along the central cylinder (200) and penetrate the wall of the central cylinder (200). The interior of the central cylinder (200) is connected to the exterior of the central cylinder (200) through the air passage (800).

8. The magnesium smelting reduction tank system according to claim 6, characterized in that, The highest point of the electromagnetic coil in the height direction is lower than the upper surface of the central cylinder (200).

9. The magnesium smelting reduction tank system according to claim 6, characterized in that, The central cylinder (200) is detachably connected to the bottom of the tank body (100).

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