Direct-current submerged arc furnace for producing fused magnesium oxide

Abstract

The utility model relates to the technical field of electric smelting magnesium oxide production equipment, in particular to a direct current submerged arc furnace for producing electric smelting magnesium oxide, which comprises a base, an electric arc furnace body arranged on the base, a trolley arranged on the base, and an electric smelting furnace arranged on the trolley, a sealing cover is arranged at the side end of the trolley; during use, after materials are filled into the hearth through the hollow electrode through the driving part I and the driving part II by utilizing stable current and voltage of the direct-current power supply, the materials can be rapidly heated and melted in a plasma arc area below the hollow electrode; and then the materials are jointly heated and molten through the bottom electrode, electromagnetic stirring is formed on a molten pool in the hearth through the longitudinally-arranged hollow electrode and the bottom electrode, the reduction reaction rate is increased, and homogenization of the temperature and components of the molten pool is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of fused magnesium oxide production equipment, and in particular to a DC submerged arc furnace for producing fused magnesium oxide. Background Technology

[0002] Currently, the domestic fused magnesium smelting process uses the molten lump (also called molten slab) method. Whether it's the "one-step" method of directly smelting ore (for ordinary fused magnesium) or the "two-step" method of large-crystal fused magnesium using lightly calcined magnesia, the AC furnace used for smelting is exactly the same: "an open, high-fume hood, with a circular iron drum as the furnace body, and three carbon electrodes suspended inside the drum." After the arc is ignited, raw material is manually loaded around the electrode arc, burying it. The raw material melts into liquid under the heat of the arc, operating in a shallow molten pool. When the upper surface of the material exposes the arc, more material is loaded until one smelting cycle is complete. As raw material is continuously loaded and melted, the liquid level inside the furnace rises continuously, and the electrodes must be raised accordingly to maintain a stable arc. When the electrodes reach the upper edge of the iron drum (i.e., the furnace opening), one smelting cycle is complete.

[0003] However, most electric arc furnaces for fused magnesium oxide currently use three-phase AC power. This type of furnace heats the furnace by igniting an arc with three triangularly arranged electrodes. During smelting, materials are added to the furnace in batches according to the needs of the furnace. The furnace charge is piled up in a cone around the electrodes and a suitable material level is maintained. As the reduction reaction proceeds, the furnace charge continues to sink, resulting in a low reduction reaction rate and poor uniformity of the molten pool temperature and composition. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a DC submerged arc furnace for producing fused magnesium oxide, so as to solve the technical problems of low reduction reaction rate and poor uniformity of molten pool temperature and composition when the existing technology is used.

[0005] To achieve the above objectives, this utility model provides a DC submerged arc furnace for producing fused magnesium oxide, comprising a base, an electric arc furnace body disposed on the base, a hollow electrode disposed on the top of the electric arc furnace body, and the DC submerged arc furnace further comprising:

[0006] A trolley is mounted on the base, and the side end of the trolley is provided with a closed cover;

[0007] A furnace cylinder is mounted on the trolley, and the furnace cylinder is equipped with water-cooling pipes;

[0008] The bottom electrode located at the bottom of the furnace hearth is used to electromagnetically stir the molten pool inside the furnace hearth by means of the vertically arranged hollow electrode and the bottom electrode via a DC power supply.

[0009] A drive unit 1 for driving the hollow electrode to rise and fall;

[0010] Drive unit two for moving the trolley and the enclosure.

[0011] Furthermore, the upper end of the hollow electrode is provided with a feeding groove, and the amount of material fed in is controlled by a switching valve.

[0012] Furthermore, the drive unit one includes:

[0013] A mounting bracket located on the top of the furnace cover of the electric arc furnace body;

[0014] A drive motor is located at the top of the mounting bracket;

[0015] A lead screw is provided on the output end of the drive motor, and the other end of the lead screw is rotatably mounted on the mounting bracket.

[0016] A slider is slidably disposed within the mounting bracket, and the slider is also threadedly mounted on the lead screw. The feeding groove is fixedly disposed on the slider.

[0017] Furthermore, the furnace cover of the electric arc furnace body is provided with a flue pipe, which connects the inside of the electric arc furnace body and the outside of the electric arc furnace body.

[0018] Furthermore, the second drive unit is a winch located on both sides of the electric arc furnace body, and the output end of the winch drives the closed cover to move via a rope.

[0019] Furthermore, the bottom electrode corresponds to the hollow electrode.

[0020] Furthermore, the feeding port of the hollow electrode penetrates through the furnace cover of the electric arc furnace body.

[0021] Furthermore, the enclosure can be sealed onto the electric arc furnace body.

[0022] The beneficial effects of this utility model are as follows: When using the DC submerged arc furnace for producing fused magnesium oxide according to this utility model, the stable current and voltage of the DC power supply are used by the first and second drive units to allow the material to be filled into the furnace cylinder through the hollow electrodes. The material can be rapidly heated and melted in the plasma arc zone below the hollow electrodes, and then heated and melted by the bottom electrodes. The vertically arranged hollow electrodes and bottom electrodes form electromagnetic stirring in the molten pool in the furnace cylinder, which accelerates the reduction reaction rate and achieves uniformity of the temperature and composition of the molten pool. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the assembly of the platform vehicle and the second drive unit of this utility model;

[0026] Figure 3 This is a schematic diagram of the assembly of the hollow electrode and the driving part 1 in this utility model;

[0027] Figure 4 This is a schematic diagram of a portion of the structure of this utility model.

[0028] The diagram is marked as follows:

[0029] 1. Base; 2. Electric arc furnace body; 3. Hollow electrode; 4. Trolley; 5. Enclosed cover; 6. Furnace cylinder; 7. Water cooling pipe; 8. Bottom electrode; 9. Feeding trough; 10. Mounting frame; 11. Drive motor one; 12. Lead screw one; 13. Slider; 14. Exhaust pipe; 15. Winch; 16. Rope; 18. Switch valve. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0031] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] An embodiment of this utility model proposes a DC submerged arc furnace for producing fused magnesium oxide, such as... Figure 1-4 As shown, the furnace includes a base 1, an electric arc furnace body 2 mounted on the base 1, and a hollow electrode 3 on the top of the electric arc furnace body 2. The DC submerged arc furnace also includes:

[0033] A trolley 4 is mounted on a base 1, and a closed cover 5 is provided on the side of the trolley 4;

[0034] A furnace hearth 6 is mounted on a trolley 4, and a water-cooling pipe 7 is provided on the furnace hearth 6.

[0035] The bottom electrode 8, located at the bottom of the furnace hearth 6, forms an electromagnetic stirring effect on the molten pool inside the furnace hearth 6 through the vertically arranged hollow electrode 3 and bottom electrode 8 powered by a DC power supply.

[0036] Drive unit 1 for driving the hollow electrode 3 to rise and fall;

[0037] Drive unit 2 is used to move the trolley 4 and the enclosure 5.

[0038] Working process and principle: In this embodiment, the hollow electrode 3 is first driven to rise by the first drive unit, and then the trolley 4 is driven by the second drive unit to move and be placed into the electric arc furnace body 2, so that the sealing cover 5 is closed on the electric arc furnace body 2, so that a negative pressure environment can be formed inside the sealed electric arc furnace body 2, which is conducive to the gasification and overflow of impurities. Then the hollow electrode 3 descends.

[0039] Then, the material with added carbonaceous reducing agent is continuously filled into the furnace hearth 6 through the hollow electrode 3. Using the stable current and voltage of the DC power supply, the temperature of the plasma arc zone below the hollow electrode 3 reaches above 5000℃, so that after the material is filled into the furnace hearth 6 through the hollow electrode 3, the material can be rapidly heated and melted in the plasma arc zone below the hollow electrode 3. Then, the material is heated and melted together through the bottom electrode 8. The vertically arranged hollow electrode 3 and bottom electrode 8 form electromagnetic stirring in the molten pool in the furnace hearth 6, which accelerates the reduction reaction rate and achieves uniformity of the molten pool temperature and composition.

[0040] In this embodiment, the upper end of the hollow electrode 3 is provided with a feeding groove 9, and the amount of material fed in is controlled by a switching valve 18.

[0041] In this embodiment, the driving unit one includes:

[0042] Mounting bracket 10 is located on the top of the furnace cover of the electric arc furnace body 2;

[0043] Drive motor 11 is located at the top of the mounting bracket 10;

[0044] A lead screw 12 is mounted on the output end of the drive motor 11, and the other end of the lead screw 12 is rotatably mounted on the mounting bracket 10.

[0045] The slider 13 is slidably installed in the mounting bracket 10. The slider 13 is also threaded onto the lead screw 12. The feeding groove 9 is fixedly installed on the slider 13. Specifically, the lead screw 12 is driven to rotate by the output end of the drive motor 11, and then the slider 13 drives the feeding groove 9 and the hollow electrode 3 to perform lifting and lowering actions.

[0046] In this embodiment, as Figure 1 As shown, the furnace cover of the electric arc furnace body 2 is provided with a flue pipe 14. The flue pipe 14 connects the inside and outside of the electric arc furnace body 2. The flue gas discharged through the flue pipe 14 is treated by existing common treatment systems to complete the centralized treatment of flue gas and waste heat recovery.

[0047] In this embodiment, the second drive unit is a winch 15 located on both sides of the electric arc furnace body 2. The output end of the winch 15 drives the closed cover 5 to move via the rope 16. Specifically, the output ends of the winches 15 on both sides drive the closed cover 5 to move via the rope 16, thereby driving the trolley 4 to slide back and forth on the base 1, so as to facilitate the material handling for furnace closing and opening.

[0048] In this embodiment, the bottom electrode 8 corresponds to the hollow electrode 3 to ensure stable current and voltage and improve smelting efficiency.

[0049] In this embodiment, as Figure 1 As shown, the feeding port of the hollow electrode 3 penetrates the furnace cover of the electric arc furnace body 2.

[0050] In this embodiment, as Figure 1 As shown, the enclosure 5 can be enclosed on the electric arc furnace body 2.

[0051] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0052] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A DC submerged arc furnace for producing fused magnesium oxide, comprising a base (1) and an electric arc furnace body (2) disposed on the base (1), characterized in that, The top of the electric arc furnace body (2) is provided with a hollow electrode (3), and the DC submerged arc furnace further includes: A trolley (4) is mounted on the base (1), and a closed cover (5) is provided on the side end of the trolley (4); A furnace cylinder (6) is provided on the trolley (4), and a water-cooled pipe (7) is provided on the furnace cylinder (6); The bottom electrode (8) located at the bottom of the furnace (6) forms an electromagnetic stirring of the molten pool in the furnace (6) by means of the hollow electrode (3) arranged longitudinally and the bottom electrode (8) via a DC power supply. A drive unit 1 for driving the hollow electrode (3) to rise and fall; Drive unit 2 for moving the trolley (4) and the enclosure (5).

2. The DC submerged arc furnace for producing fused magnesium oxide according to claim 1, characterized in that, The upper end of the hollow electrode (3) is provided with a feeding groove (9), and the amount of material fed in is controlled by a switching valve (18).

3. A DC submerged arc furnace for producing fused magnesium oxide according to claim 2, characterized in that, The drive unit one includes: A mounting bracket (10) is provided on the top of the furnace cover of the electric arc furnace body (2); A drive motor (11) is located on the top of the mounting bracket (10); A lead screw (12) is provided on the output end of the drive motor (11), and the other end of the lead screw (12) is rotatably mounted on the mounting bracket (10); A slider (13) is slidably disposed in the mounting bracket (10), and the slider (13) is also threadedly mounted on the lead screw (12). The feeding groove (9) is fixedly disposed on the slider (13).

4. A DC submerged arc furnace for producing fused magnesium oxide according to claim 1, characterized in that, The furnace cover of the electric arc furnace body (2) is provided with a smoke exhaust pipe (14), which connects the inside of the electric arc furnace body (2) and the outside of the electric arc furnace body (2).

5. A DC submerged arc furnace for producing fused magnesium oxide according to claim 1, characterized in that, The second drive unit is a winch (15) located on both sides of the electric arc furnace body (2). The output end of the winch (15) drives the closed cover (5) to move via a rope (16).

6. A DC submerged arc furnace for producing fused magnesium oxide according to claim 1, characterized in that, The bottom electrode (8) corresponds to the hollow electrode (3).

7. A DC submerged arc furnace for producing fused magnesium oxide according to claim 1, characterized in that, The feeding port of the hollow electrode (3) penetrates the furnace cover of the electric arc furnace body (2).

8. A DC submerged arc furnace for producing fused magnesium oxide according to claim 1, characterized in that, The enclosure (5) can be enclosed on the electric arc furnace body (2).

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