High-resistivity fused zirconia corundum brick and production equipment thereof

Abstract

The invention discloses a high-resistivity fused zirconia corundum brick and production equipment thereof, and aims to solve the problems that a traditional three-phase electric arc furnace is uneven in fusion, long in low-temperature zone fusion time and limited in oxygen blowing effect. The equipment comprises a three-phase electric arc furnace, three angle-adjustable electric arc rods are arranged in the furnace body, a plurality of push plates synchronously push edge raw materials to the center through a driving device, an adjusting device adjusts the angles of the electric arc rods through a triangular prism and a limiting arm, an oxygen blowing structure optimizes oxygen distribution through an adjustable oxygen blowing gun, and the temperature is controlled through a cooling assembly. The preparation method comprises the following steps: proportioning according to the mass fraction, smelting at the temperature of 2100 DEG C or above, casting, slowly cooling and processing to obtain the zirconia corundum brick. The melting uniformity is improved through a push plate, the melting time is shortened through angle adjustment of an electric arc rod, raw material flowing is promoted through dynamic adjustment of an oxygen lance, the rising burden temperature in the furnace is precisely adjusted through a cooling assembly via a heat insulation plate and a cooling water pipe, heat is prevented from being diffused to the outside of the furnace and the furnace cover through circulating heat dissipation of cooling water, and the service life of the furnace is prolonged. The service life of the adjusting device is influenced.

Description

TECHNICAL FIELD

[0001] The application relates to a high-resistivity electrically fused zirconia corundum brick and a production device thereof, and belongs to the technical field of refractory material production devices. BACKGROUND

[0002] Zirconia corundum bricks are important refractory materials, and are widely used in glass kiln, metallurgical industry and other fields due to their high resistivity, high temperature resistance, corrosion resistance and other excellent performances. At present, the production of zirconia corundum bricks is mainly prepared by melting corundum brick raw materials through a three-phase electric arc furnace.

[0003] However, referring to the drawings in the specification Figure 16 The existing three-phase electric arc furnace device has the following problems in the melting process: Firstly, after the electric arc rod melts the raw materials in the center of the furnace, the raw materials located at the edge of the furnace body are too far away from the electric arc rod and cannot be melted. At this time, the raw materials at the edge of the furnace body will collapse to the middle part and approach the electric arc rod only after the raw materials in the center part are completely melted and the molten raw materials cannot support the raw materials at the edge of the furnace body. Secondly, the three-phase electric arc furnace is divided into an arc striking stage, a hole penetrating stage, an electrode rising stage and a low-temperature zone furnace material melting stage according to the lifting of the electric arc rod. Since the electric arc rod only has the function of vertical lifting, the melting of the raw materials is only in the central area, and the low-temperature zone furnace material melting stage in the area far from the central area lasts for a long time. Thirdly, the three-phase electric arc furnace needs to supplement oxygen to increase the temperature during the melting process. However, the oxygen lance used at present is only inserted into the central area of the three-phase electric arc furnace for fixed oxygen supplement when needed. The oxygen lance blows out at a fixed angle to the molten raw materials, which has limited influence on the fluid movement of the molten raw materials and cannot blow the low-temperature zone raw materials to the central area.

[0004] In view of the above problems, a high-resistivity electrically fused zirconia corundum brick production device capable of improving the melting uniformity of raw materials, optimizing the adjustment capacity of the electric arc rod and improving the production efficiency is needed. SUMMARY

[0005] The application aims to provide a high-resistivity electrically fused zirconia corundum brick and a production device thereof, which can effectively solve the above problems.

[0006] In order to solve the above technical problems, the application is realized by the following technical scheme: A high-resistivity electrically fused zirconia corundum brick comprises the following raw materials in terms of mass fraction: 50% to 55% of alumina, 40% to 45% of zirconium dioxide, 4% to 5% of silicon dioxide, 0.05% to 0.1% of diiron trioxide and 0.5% to 0.8% of soda ash; The forming process of the corundum brick is as follows: (1)Batching: prepare raw material powder of alumina, zirconia, silica, ferric oxide, soda ash according to the weight percentage of raw material oxides; the purity of each raw material is greater than 99%; (2) Melting: add the raw material powder into a three-phase electric arc furnace to heat and melt, and introduce oxygen for high-temperature smelting, with the smelting temperature controlled above 2100℃; (3) Casting: cast the obtained melt into a graphite mold, and put it into a slow cooling tank for annealing and slow cooling to room temperature with a corundum powder embedding; (4) Processing: process the refractory product obtained after annealing into the high-purity corundum brick.

[0007] High resistivity electrically fused zirconia corundum brick production equipment: It comprises a three-phase electric arc furnace, which comprises a furnace body for placing corundum brick raw materials, a furnace cover covering the upper end of the furnace body, an electric arc rod arranged in the furnace body for melting the corundum brick raw materials, and a push plate for pushing the corundum brick raw materials at the edge of the furnace body to the center. The number of push plates is multiple, which are circumferentially distributed on the inner wall of the furnace body, and the multiple push plates are driven by the same driving device.

[0008] Further, the driving device comprises a push rod fixedly connected with the push plate and a driving ring rotationally connected with the outer periphery of the furnace body; the push rod is slidingly arranged in a sliding groove penetrating through the furnace body, the driving ring is internally provided with a driving groove, the groove surface of the driving groove is an arc surface, and the arc surface gradually approaches zero in terms of the rotation direction and the arc of the driving ring; the end surface of one end of the push rod matches the arc surface, and when the driving ring rotates forward, the arc surface pushes the push rod to move inwardly to the furnace body.

[0009] Further, the outer surface of one section of the driving ring is provided with a rack, the rack is engaged with a gear, and the gear is connected to a driving motor through a rotating shaft.

[0010] Further, an elastic recovery structure is further arranged between the push rod and the furnace body, and the elastic recovery structure comprises a recovery groove arranged on the furnace body and a recovery plate arranged on the push rod; the recovery groove is communicated with the sliding groove, and the recovery plate is arranged in the recovery groove; one end of the recovery plate is provided with a spring, and the other end of the spring is fixed to the groove wall of the recovery groove.

[0011] Further, the number of electric arc rods is three, and the electric arc rods are outwardly rotated by an adjusting device.

[0012] Furthermore: the adjustment device includes an adjustment box, the upper end of which is connected to the hoisting and lifting structure, and the lower end of which is rotatably connected to the arc rod via a hinge plate; an installation ring is provided at the upper end of the arc rod, and the hinge plate is rotatably connected to the installation ring via a rotating shaft; a triangular prism is slidably arranged inside the adjustment box, and a limit arm is provided between the triangular prism and the installation ring, one end of which is hinged to the side of the triangular prism and the other end of which is hinged to the outer periphery of the installation ring.

[0013] Furthermore: the adjustment box is equipped with a lifting device for controlling the raising and lowering of the triangular prism. The lifting device includes a lifting motor, the output end of which is connected to a screw via a coupling. The upper end of the screw is rotatably mounted on the top of the adjustment box, and a lifting plate is threaded onto the screw. The lifting plate is connected to the upper end face of the triangular prism via a lifting column.

[0014] Furthermore, the three-phase electric arc furnace is also equipped with an oxygen blowing structure, which includes an oxygen blowing hole penetrating the furnace body, an oxygen blowing lance inserted into the oxygen blowing hole, and a control structure for controlling the horizontal adjustment of the nozzle of the oxygen blowing lance.

[0015] Furthermore: the control structure includes a first control plate that rotates in a circle around the furnace body and a second control plate installed inside the oxygen blowing hole; the first control plate has a mounting hole, and the inner wall of the mounting hole is arrayed with a first limiting spring, one end of which is fixed with a limiting ring; the second control plate has a limiting hole, and the side of the second control plate is connected to the hole wall of the oxygen blowing hole through a second limiting spring; the oxygen blowing gun is inserted into the limiting ring and the limiting hole.

[0016] Furthermore: the first control board is fixed to the lower end face of the drive ring; the furnace body also has multiple cooling components around its circumference, the cooling components include a heat insulation plate fixed to the inner wall of the furnace body, a cooling water pipe is fixed on the heat insulation plate, and the port of the cooling water pipe is connected to a water circulation device.

[0017] The beneficial effects are: 1. Improve the uniformity of raw material melting Multiple pushers, distributed circumferentially along the inner wall of the furnace and driven synchronously by a drive unit, actively push the raw material at the edges to below the arc bar, avoiding the problem of raw material at the edges not melting quickly due to being too far from the arc bar. Compared to the traditional passive method that relies on the collapse of molten raw material, this design significantly improves the uniformity of raw material distribution within the furnace, ensuring full coverage of the melting process and reducing unmelted residue.

[0018] 2. Optimize the adjustment capability of the arc rod The electric arc rod's angle is adjusted via an adjustment device. The cooperation between the triangular prism and the limiting arm allows the electric arc rod to flexibly change its tilt angle during arc initiation, well penetration, and low-temperature melting, thus expanding the heating range. Compared to the limitations of electric arc rods in the prior art, which only have vertical lifting capabilities, this invention shortens the melting time of the furnace charge in the low-temperature zone, improves smelting efficiency, and simultaneously meets the requirements for high-temperature smelting above ℃, making the melting process more efficient and controllable.

[0019] 3. Enhance oxygen blowing effect and raw material flowability The oxygen lance in the oxygen blowing structure achieves dynamic adjustment of the nozzle angle through a control structure. Compared with the shortcomings of the fixed-angle oxygen supply in the existing technology, this design not only increases the furnace temperature, but also promotes the fluid movement of molten raw materials, accelerates the melting process of edge raw materials, and improves the overall smelting effect.

[0020] 4. Enhance interoperability In this device, the driving force for controlling the horizontal tilting of the oxygen lance is provided by the drive ring: the lower end of the first control plate is fixed to the lower end face of the drive ring by bolts, and rotates synchronously with the drive ring, driving the oxygen lance to adjust its angle through the limit ring. It shares the drive device with the push plate, saving costs while allowing the pushing of edge raw materials and the control of molten fluid flow to be carried out simultaneously, thereby improving melting efficiency.

[0021] 5. Fine-tuning of the oxygen lance When the oxygen lance is being leveled, the second control plate provides elastic support for the oxygen lance. Together with the first control plate, it restricts the two ends of the oxygen lance, ensuring that the oxygen injection direction is stably directed towards the raw material in the low-temperature zone and pushes it towards the central area.

[0022] 6. Improve temperature control The cooling component precisely regulates the rising load temperature inside the furnace through heat insulation plates and cooling water pipes. It also dissipates heat through cooling water circulation to prevent heat from spreading outside the furnace and to the furnace cover, thus affecting the service life of the regulating device. Attached Figure Description

[0023] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Medium magnification Figure 1 ; Figure 3 for Figure 1 Medium magnification Figure 2 ; Figure 4 This is a cross-sectional view of the present invention; Figure 5 forFigure 4 Detail view of the middle part; Figure 6 Schematic view of the internal structure of the present application; Figure 7 Schematic view of the middle part; Figure 6 Detail view of the middle part A; Figure 8 Schematic view of the middle part; Figure 6 Detail view of the middle part B; Figure 9 Bottom view of the present application; Figure 10 Detail view of the middle part; Figure 9 Sectional view of the middle part A-A; Figure 11 Detail view of the middle part; Figure 10 Detail view of the middle part; Figure 12 Schematic view of the oxygen blowing flow of the present application; Figure 13 Schematic view of the arc rod rotation of the present application; Figure 14 Transverse sectional view of the driving ring of the present application; Figure 15 Detail view of the middle part; Figure 14 Detail view of the middle part; Figure 16 Flow chart of the prior art in the background of the present application.

[0025] Explanation of reference signs: 1, furnace body; 2, furnace cover; 3, arc rod; 4, push plate; 5, driving device; 51, push rod; 52, driving ring; 53, sliding groove; 54, driving groove; 55, camber; 56, rack; 57, gear; 58, driving motor; 59, elastic recovery structure; 591, recovery groove; 592, recovery plate; 593, spring; 6, adjusting device; 61, adjusting box; 62, hinged plate; 63, mounting ring; 64, rotating shaft; 65, triangular column; 66, limiting arm; 67, lifting device; 671, lifting motor; 672, screw rod; 673, lifting plate; 7, oxygen blowing structure; 71, oxygen blowing hole; 72, oxygen blowing gun; 73, control structure; 731, first control plate; 732, second control plate; 733, mounting hole; 734, first limiting spring; 735, limiting ring; 736, limiting hole; 737, second limiting spring; 8, cooling assembly; 81, heat insulation plate; 82, cooling water pipe. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0027] It should be noted that in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0028] In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] Meanwhile, in the description of the present application, unless otherwise specified and limited, the terms "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Reference Figures 1-14 An embodiment of the present application is a high resistivity electrically fused zirconia corundum brick and its production equipment, The core component is a three-phase electric arc furnace. The three-phase electric arc furnace includes a furnace body 1, a furnace cover 2, electric arc rods 3 and a push plate 4. The furnace body 1 is a cylindrical refractory structure for containing corundum brick raw materials, and the top opening is covered by the furnace cover 2, which is placed directly at the top opening of the furnace body 1.

[0031] Reference Figure 1 The electric arc rods 3 are three, vertically suspended inside the furnace body 1, and generate electric arcs through external power supply for melting raw materials; and the furnace cover 2 is provided with three through holes, and the electric arc rods 3 are inserted into the furnace body 1 through the through holes.

[0032] The upper end of the electric arc rod 3 is connected through an adjusting device 6, so that the lower end can rotate outwardly or inwardly, and the electric arc rod 3 vertically inserted in the furnace body 1 is rotated, so that the electric arc rod 3 is inclined outwardly in the furnace body 1, and the end of the electric arc rod 3 at this time will be close to the inner wall of the furnace body 1, thereby expanding the range of the central area and reducing the range of the low temperature area, and accelerating the melting speed.

[0033] Reference Figure 6The push plate 4 is a plurality of arc-shaped high-temperature-resistant plates, which are distributed at equal angles and peripherally along the inner wall of the furnace body 1. The plurality of push plates 4 almost fully cover the inner wall of the furnace body 1, and gaps are arranged between adjacent two push plates 4. Each push plate 4 is fixed on the corresponding push rod 51 by welding or integral forming. In the low-temperature zone, the push plates 4 are used to push the raw materials at the edge of the furnace body 1 to the central area in the melting stage of the raw materials, so as to solve the problem that the raw materials at the edge cannot be timely melted due to being too far away from the arc rod 3.

[0034] Referring to Figure 2 , Figure 5 The driving device 5 has the following effects: The plurality of push plates 4 are uniformly driven by the same driving device 5, so as to ensure synchronization. The driving device 5 includes the push rod 51 and the driving ring 52.

[0035] The push rod 51 is a high-temperature-resistant metal rod, one end of which is fixed on the back surface of the push plate 4 by a bolt, and the other end of which extends to the outside of the furnace body 1 through a sliding groove 53 of the furnace body 1. The sliding groove 53 is a rectangular groove penetrating through the furnace body 1, and the push rod 51 can slide horizontally in the sliding groove 53.

[0036] The driving ring 52 has an annular structure and is sleeved on the outer periphery of the furnace body 1. Circular arc plates are arranged at intervals on the outer periphery of the furnace body 1. The inner annular surface of the driving ring 52 is provided with grooves matching the thickness of the circular arc plates. The grooves and the circular arc plates match, so that the driving ring 52 can rotate relative to the furnace body 1. Of course, the driving ring 52 can also be rotatably connected to the furnace body 1 by using a large-diameter bearing with a higher cost.

[0037] Referring to Figure 14 , Figure 15 A plurality of driving grooves 54 are arranged on the inner side of the driving ring 52, and each driving groove 54 corresponds to one push rod 51. The groove surface of the driving groove 54 is an arc surface 55. The arc surface 55 has a large curvature from the starting point of the rotation direction of the driving ring 52 and gradually tends to zero. The end surface of the end of the push rod 51 close to the driving ring 52 is arc-shaped and closely matches the arc surface 55. When the driving ring 52 rotates forward, the curvature change of the arc surface 55 pushes the push rod 51 to move along the sliding groove 53 to the center of the furnace body 1, and drives the push plate 4 to push the raw materials at the edge to the position below the arc rod 3.

[0038] Rotation mode of the driving ring 52: A gear rack 56 is arranged on the outer surface of the driving ring 52. The gear rack 56 is engaged with a gear 57. The gear 57 is fixed on the output shaft of a driving motor 58 through a rotating shaft. The driving motor 58 is a servo motor, which is fixed on a support outside the furnace body 1 and controls the movement of the driving ring 52 through forward and reverse rotation.

[0039] Referring to Figure 5 Reset of the push plate 4 after being pushed out: Because the end face of the push rod 51 is set with the arc surface 55 of the drive groove 54, the push rod 51 cannot be retracted by rotating the drive ring 52 in the opposite direction; therefore, in order to realize the automatic reset of the push plate 4, an elastic recovery structure 59 is provided between the push rod 51 and the furnace body 1.

[0040] The elastic recovery structure 59 includes a recovery groove 591 and a recovery plate 592. The recovery groove 591 is a rectangular groove set on the outer wall of the furnace body 1 and communicates with the interior of the slide groove 53. The recovery plate 592 is a rectangular plate, welded to the push rod 51 near the outer end and slidably set in the recovery groove 591. A spring 593 is connected to the side of the recovery plate 592 near the center of the furnace body 1, and the other end of the spring 593 is fixed to the groove wall of the recovery groove 591 near the center of the furnace body 1 by bolts. When the drive ring 52 rotates forward, the push rod 51 is pushed towards the center of the furnace body 1, and the spring 593 is compressed. When the drive ring 52 rotates in the reverse direction, the pushing force of the arc surface 55 on the push rod 51 disappears, the compressed spring 593 releases its elastic potential energy, pushes the push rod 51 to move outward, and resets the push plate 4.

[0041] See Figure 6 , Figure 7 Adjustment of the molten center region of arc rod 3: After entering the low-temperature zone of the furnace charge melting stage, this is specifically achieved by the regulating device 6.

[0042] The adjusting device 6 includes an adjusting box 61, which is a cylindrical metal box. The upper end is connected to an external hoisting structure via a hook, and the lower end is rotatably connected to the upper ends of three arc rods 3 via three sets of hinge plates 62. Each arc rod 3 has a mounting ring 63 welded to its upper end. The hinge plate 62 is hinged to the mounting ring 63 via a rotating shaft 64, allowing the arc rod 3 to rotate around the rotating shaft 64.

[0043] However, in order to allow the arc rod 3 to be rotated and adjusted, a triangular prism 65 is also slidably installed inside the adjustment box 61. The triangular prism 65 is a prism with an isosceles triangular cross section, and its three sides are respectively connected to three mounting rings 63 through limiting arms 66. The limiting arm 66 is a straight rod, one end of which is connected to the side of the triangular prism 65 through a hinge, and the other end is connected to the outer periphery of the mounting ring 63 through a hinge.

[0044] When the triangular prism 65 descends, it will drive the limiting arm 66, which is hinged to it, to descend as well. At the same time, since the limiting arm 66 is hinged to the mounting ring 63, the descending limiting arm 66 will also rotate. However, the length of the limiting arm 66 is fixed. Therefore, in order for the limiting arm 66 to descend normally, one end of the limiting arm 66 will drive the mounting ring 63 to descend. At this time, the mounting ring 63 will rotate due to the setting of the rotating shaft 64, causing the arc rod 3 to tilt. After tilting, the arc rod 3 will expand its central area, and the low temperature zone will become smaller, which can accelerate the melting of the raw material.

[0045] Lifting control of the triangular prism 65: The regulating box 61 is equipped with a lifting device 67, including a lifting motor 671. The lifting motor 671 is fixed to the bottom of the regulating box 61, and its output end is connected to the screw 672 via a coupling. The screw 672 is a vertically arranged lead screw, and its upper end is fixed to the top of the regulating box 61 by a bearing. The lifting plate 673 is a horizontal plate, which is threaded to the screw 672 through a threaded hole, and its lower surface is welded to the upper end face of the triangular column 65 via a lifting column. When the lifting motor 671 rotates forward or reverse, the screw 672 drives the lifting plate 673 to rise or fall, causing the triangular column 65 to move synchronously. The limiting arm 66 pushes or pulls the mounting ring 63 to change the tilt angle of the arc rod 3.

[0046] The oxygen blowing stage is carried out as follows: See Figure 3 , Figure 8 , Figure 11 The oxygen blowing structure 7 is used to supplement oxygen into the furnace body 1 to increase the temperature and promote the flow of raw materials. The oxygen blowing structure 7 includes oxygen blowing holes 71, oxygen blowing lances 72, and control structure 73. The oxygen blowing holes 71 are multiple inclined circular holes that penetrate the furnace body 1 and are distributed along the circumference of the side wall of the furnace body 1. They can blow oxygen into the central area, increase the temperature of the central area, and accelerate the melting of raw materials. At the same time, the inner wall of the furnace body 1 through which the oxygen blowing holes 71 penetrate is located in the gap between the push plates 4.

[0047] The oxygen lance 72 is a high-temperature resistant metal tube with a nozzle at the front end, which is inserted into the oxygen blowing hole 71, and the rear end is connected to an external oxygen supply system. Due to the inclined oxygen blowing hole 71, after the oxygen lance 72 is inserted, the nozzle is tilted towards the surface of the molten material in the center area; if the oxygen pressure is sufficient, it can blow the molten material, causing the raw materials located at the edge to move towards the center under the drive of the molten fluid.

[0048] In order to increase the fluidity of the molten material and reduce the time for the raw materials to transform into molten material, this device is equipped with a control structure 73 for adjusting the nozzle of the oxygen blowing lance 72; the purpose is to accelerate the fluid movement speed and uniformity of the molten material.

[0049] The control structure 73 includes a first control plate 731 and a second control plate 732. The first control plate 731 is a rectangular plate, installed on the outer periphery of the furnace body 1, and can rotate around the outer periphery of the furnace body 1. It has a mounting hole 733 inside, which corresponds to an oxygen blowing hole 71. At the same time, multiple first limiting springs 734 are evenly distributed on the inner wall of the mounting hole 733. The free end of the first limiting spring 734 is fixed with a limiting ring 735. The limiting ring 735 is a circular ring that fits around the oxygen blowing gun 72 and is elastically supported by the spring.

[0050] The second control plate 732 is a rectangular plate installed inside the oxygen blowing hole 71. It has a circular limiting hole 736 in the center. The oxygen blowing gun 72 first passes through the limiting ring 735 and then through the limiting hole 736. The side of the second control plate 732 is connected to the inner wall of the oxygen blowing hole 71 through multiple second limiting springs 737, providing elastic adjustment in the horizontal direction.

[0051] The oxygen lance 72 of this device first passes through the limiting ring 735 and then through the limiting hole 736. When the first control plate 731 rotates around the furnace body 1, the oxygen lance 72 tilts horizontally under the action of the first limiting spring 734 outside the limiting ring 735 and the second limiting spring 737 outside the second control plate 732, adjusting the position of the nozzle of the oxygen lance 72. At this time, the six oxygen lances 72 work together on the molten material, which can not only move the raw material located at the edge to the center under the drive of the molten fluid, but also make the molten fluid form a vortex, absorbing more raw material located at the edge and accelerating the melting process of the raw material.

[0052] See Figure 1 In this device, the driving force for controlling the horizontal tilting of the oxygen lance 72 is provided by the drive ring 52. The lower end of the first control plate 731 is fixed to the lower end face of the drive ring 52 by bolts. It rotates synchronously with the drive ring 52, driving the oxygen blowing gun 72 to adjust the angle through the limit ring 735. The second limit spring 737 assists the oxygen blowing gun 72 in making fine adjustments in the horizontal direction, so that the oxygen injection direction can be flexibly changed, blowing the raw material in the low temperature zone towards the central area, thus solving the problem of fixed oxygen blowing angle.

[0053] Cooling of non-raw material areas within furnace body 1: The furnace body 1 is not completely filled with raw materials, but only half of it. The other half of the space is used to cool down the high temperature generated by the electric arc rod 3, so as to prevent the high temperature from rising and affecting the temperature of the electric arc rod 3, the space above the furnace body 1, or the normal operation of the equipment. Therefore, in order to prevent the high temperature heat from dissipating into the air or affecting the equipment above the furnace body 1, a cooling component 8 is installed in this device.

[0054] Multiple cooling components 8 are distributed circumferentially along the inner wall of the furnace body 1 to regulate the melting temperature. Each cooling component 8 includes a heat insulation plate 81 and a cooling water pipe 82. The heat insulation plate 81 is a refractory ceramic plate, fixed to the inner wall of the furnace body 1 with bolts. The cooling water pipe 82 is a serpentine metal pipe embedded in the surface of the heat insulation plate 81, with its two ends connected to an external water circulation device via flexible hoses for heat dissipation through cooling water circulation. This cooling component does not affect the melting of the raw material because the melting only occurs in the central area; the temperature in the non-central area is insufficient for melting. For example, if the raw material requires 2000℃ to melt, melting cannot be achieved in the non-central area at 1900℃, thus these high-temperature air elements become a burden. Simultaneously, the temperature inside the entire furnace body 1 is high during operation, with the furnace cover 2 reaching approximately 1000℃. Such high temperatures would affect the normal operation of the lifting motor 671 in the regulating device 6. A cooling component 8 is installed, which can reduce the rising high temperature of the load to 200°C when it reaches the furnace cover 2; this temperature has little impact on the lifting motor 671.

[0055] Working process of a three-phase electric arc furnace: During production, corundum brick raw materials are loaded into furnace body 1, furnace cover 2 is closed, and the equipment is started.

[0056] 1. Arc ignition stage: The hoisting and lifting structure lowers the regulating box 61, and three electric arc rods 3 are inserted into the raw material located above the furnace body 1. When electricity is applied, an electric arc is generated and melting begins.

[0057] 2. Well-penetrating stage: The raw material located above the furnace body 1 is continuously heated by the electric arc rod 3. The raw material in the central area melts to form a molten pool. Then, the hoisting and lifting structure is activated to control the electric arc rod 3 to descend. It melts and descends at the same time until it reaches a position close to the bottom of the furnace body 1.

[0058] 3. Electrode recovery stage: The raw material at the bottom of the central area inside the furnace body 1 is transformed into a molten state, and the hoisting and lifting structure is controlled to raise the electric arc rod 3 slightly.

[0059] 4. Low-temperature zone charge melting stage: Step 1: Cooling component 8 is used to cool down the rising load temperature to prevent the high temperature generated during the long-term low-temperature zone charge melting stage from affecting the operation of the lifting motor 671 on the furnace cover 2.

[0060] Step 2: The lifting motor 671 drives the screw 672 to rotate forward, the lifting plate 673 rises, and the triangular column 65 pulls the mounting ring 63 through the limiting arm 66, so that the lower end of the electric arc rod 3 tilts outward and expands the initial melting range. Step 3: Insert the oxygen lance 72 and blow oxygen into the furnace. The airflow blows the surface of the molten fluid, and the raw material in the low-temperature zone flows towards the center zone with the fluid. Step 4: Drive motor 58 rotates forward, drive ring 52 rotates through rack 56 and gear 57, arc surface 55 pushes push rod 51, push plate 4 pushes edge material towards the center to avoid edge material stagnation; while drive motor 58 rotates, first control plate 731 rotates with drive ring 52, driving oxygen gun 72 to adjust angle, second control plate 732 finely adjusts gun nozzle through second limit spring 737, airflow blows molten fluid, causing fluid to form vortex, so that raw material flows more evenly towards the center area.

[0061] 5. Complete melting: After the raw material is completely melted, turn off the electric arc rod 3 and the oxygen lance 72, open the slag door, and remove the slag floating on the surface of the molten material; then open the discharge pipe and pour the molten material into the mold to cool into bricks.

[0062] This embodiment solves the problem of difficult melting of edge raw materials by actively pushing the pusher plate 4 to the area below the arc rod 3; the arc rod 3 can be adjusted in angle by the adjustment device 6 to expand the melting range and shorten the melting time in the low-temperature zone; the oxygen blowing gun 72 can flexibly adjust its angle through the control structure 73 to promote the flow and oxidation of raw materials, which is more effective than fixed oxygen supply. The cooling component 8 ensures that the temperature is controllable, ultimately improving the melting uniformity and production efficiency, and producing high resistivity zirconium corundum bricks.

[0063] Example 1: Mass ratio of corundum brick raw materials: The composition consists of 40% zirconium dioxide (99.99% purity), 5% silicon dioxide, 0.1% ferric oxide, 0.5% soda ash, and the balance being aluminum oxide (54.4%). The process is as follows: (1) Ingredients: Prepare alumina, zirconium dioxide, silicon dioxide, ferric oxide, soda ash, manganese dioxide and copper oxide according to the weight percentage of the raw material oxides to obtain raw material powder; the purity of each raw material is greater than 99%; (2) Melting: The raw material powder is added to a three-phase electric arc furnace and heated to melt, and oxygen is introduced for high-temperature melting, with the melting temperature controlled above 2100℃; (3) Casting: The obtained molten liquid is cast into a graphite mold and placed in a slow cooling tank for heat preservation and annealing by embedding corundum powder and slowly cooling to room temperature. (4) Processing: The refractory product obtained after heat preservation and annealing is processed into the high-purity corundum brick.

[0064] The corundum bricks obtained in this embodiment have superior refractoriness; at the same time, the resistivity of the prepared corundum bricks is moderate at room temperature, as measured by an impedance analyzer.

[0065] Example 2: Mass ratio of corundum brick raw materials: The composition consists of 45% zirconium dioxide (99.99% purity), 4% silicon dioxide, 0.1% ferric oxide, 0.5% soda ash, and the balance being aluminum oxide (50.4%). The main difference between this embodiment and the above embodiment is that the mass ratio of zirconium dioxide is increased, resulting in corundum bricks with better thermal shock resistance; at the same time, the resistivity of the prepared corundum bricks is high at room temperature as measured by an impedance analyzer.

[0066] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A production apparatus of high resistivity electrofused zirconia-corundum brick, characterized in that: The utility model provides a three-phase electric arc furnace, which comprises a furnace body (1) for placing corundum brick raw materials, a furnace cover (2) covering the upper end of the furnace body (1), an electric arc rod (3) arranged in the furnace body (1) for melting the corundum brick raw materials, and a push plate (4) for pushing the corundum brick raw materials at the edge of the furnace body (1) to the center.

2. The high- resistivity electrofused zirconia-corundum brick production plant according to claim 1, characterized in that: The push plate (4) is in a plurality of numbers and is circumferentially distributed on the inner wall of the furnace body (1), and the plurality of push plates (4) are driven by the same driving device (5).

3. The high- resistivity electrofused zirconia-corundum brick production plant according to claim 2, characterized in that: The driving device (5) comprises a push rod (51) fixedly connected with the push plate (4) and a driving ring (52) rotationally connected with the outer periphery of the furnace body (1); the push rod (51) is slidingly arranged in a sliding groove (53) penetrating through the furnace body (1); the driving ring (52) is internally provided with a driving groove (54); the groove surface of the driving groove (54) is an arc surface (55); the arc surface (55) gradually approaches zero in terms of the rotation direction and the arc of the driving ring (52); the end surface of one end of the push rod (51) is matched with the arc surface (55); when the driving ring (52) rotates in the forward direction, the arc surface (55) pushes the push rod (51) to move inwardly of the furnace body (1).

4. The high- resistivity electrofused zirconia-corundum brick production plant according to claim 3, characterized in that: The outer surface of one section of the driving ring (52) is provided with a rack (56); the rack (56) is engaged with a gear (57); and the gear (57) is connected to a driving motor (58) through a rotating shaft.

5. The high- resistivity electrofused zirconia-corundum brick production plant according to claim 4, characterized in that: The electric arc rod (3) is in a number of three; and the electric arc rod (3) is made to rotate outwardly at one end through an adjusting device (6).

6. A high purity electrically fused zirconia-alumina brick according to claim 5, characterized in that: The adjusting device (6) comprises an adjusting box (61); the upper end of the adjusting box (61) is connected with a hoisting and lifting structure, and the lower end is rotationally connected with the electric arc rod (3) through a hinged plate (62); the upper end of the electric arc rod (3) is provided with a mounting ring (63); the hinged plate (62) is rotationally connected with the mounting ring (63) through a rotating shaft (64); a triangular column (65) is slidingly arranged in the adjusting box (61); a limiting arm (66) is arranged between the triangular column (65) and the mounting ring (63); one end of the limiting arm (66) is hingedly connected with the side surface of the triangular column (65), and the other end is hingedly connected with the outer periphery of the mounting ring (63).

7. The high- resistivity electro-fused zirconia-corundum brick production plant according to claim 6, characterized in that: The adjusting box (61) is provided with a lifting device (67) for controlling the lifting of the triangular column (65). The three-phase electric arc furnace is further provided with an oxygen blowing structure (7); the oxygen blowing structure (7) comprises an oxygen blowing hole (71) penetrating through the furnace body (1), an oxygen blowing lance (72) inserted into the oxygen blowing hole (71), and a control structure (73) for controlling the oxygen blowing lance (72) to make horizontal adjustment of the lance mouth.

8. The high- resistivity electro-fused zirconia-corundum brick production plant according to claim 7, characterized in that: The control structure (73) comprises a first control plate (731) moving circumferentially around the furnace body (1) and a second control plate (732) installed in the oxygen blowing hole (71); the first control plate (731) is provided with a mounting hole (733) in which a first limiting spring (734) is arranged on the inner wall of the mounting hole (733), and the first limiting spring (734) is fixed at one end with a limiting ring (735); the second control plate (732) is provided with a limiting hole (736), and the side surface of the second control plate (732) is connected with the hole wall of the oxygen blowing hole (71) through a second limiting spring (737); the oxygen blowing lance (72) is inserted into the limiting ring (735) and the limiting hole (736).

9. The high- resistivity electro-fused zirconia-corundum brick and the production apparatus therefor according to claim 8, characterized in that: The first control plate (731) is fixed on the lower end surface of the driving ring (52); the furnace body (1) is also circumferentially provided with a plurality of cooling assemblies (8), and the cooling assembly (8) comprises a heat insulation plate (81) fixed on the inner wall of the furnace body (1), and the heat insulation plate (81) is fixed with a cooling water pipe (82), and the pipe opening of the cooling water pipe (82) is connected with a water circulating device.

10. A high resistivity electrofused zirconia-corundum brick, characterized in that: The corundum brick is produced by the production equipment according to any one of claims 1-9, and the proportioning of the corundum brick is according to mass fraction: 50-55% of alumina, 40-45% of zirconium dioxide, 4-5% of silicon dioxide, 0.05-0.1% of diiron trioxide, and 0.5-0.8% of soda ash; the forming process of the corundum brick is: (1) batching: preparing alumina, zirconium dioxide, silicon dioxide, diiron trioxide and soda ash according to the weight percentage of raw material oxides to obtain raw material powder; the purity of each raw material is greater than 99%; (2) smelting: adding the raw material powder into a three-phase electric arc furnace to heat and melt, and high-temperature smelting is carried out by introducing oxygen, and the smelting temperature is controlled to be above 2100 DEG C; (3) casting: casting the obtained molten liquid into a graphite mold, and placing it into a slow cooling tank for annealing and slow cooling to room temperature by embedding with corundum powder; (4) processing: processing the obtained refractory product after annealing into high-purity corundum brick.

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