A hollow single-electrode DC smelting furnace for corundum smelting

Abstract

The present invention relates to the technical field of smelting furnaces, and specifically discloses a hollow single-electrode DC smelting furnace for corundum smelting, which includes a bottom electrode assembly, a furnace body assembly, a furnace cover assembly, and a hollow electrode assembly. The bottom electrode assembly is connected to the anode of the DC power supply. The furnace body assembly is installed on the bottom electrode assembly. A product discharge port is provided on the furnace body assembly, and a material plug is provided in the product discharge port. The furnace cover assembly is installed on the furnace body assembly. An exhaust pipe is provided on the furnace cover assembly. The hollow electrode assembly penetrates through the furnace cover assembly and communicates with the furnace body assembly. The hollow electrode assembly is in sliding fit with the furnace cover assembly. The hollow electrode assembly is connected to the cathode of the DC power supply, and an electrode clamping and lifting mechanism is provided on the hollow electrode assembly. The smelting efficiency of the present invention is high, the energy consumption and cost are reduced, it is environmentally friendly, and effectively guarantees the health and safety of operators.

Description

Technical Field

[0001] The present invention belongs to the technical field of smelting furnaces, and particularly relates to a hollow single-electrode DC smelting furnace for corundum smelting. Background Art

[0002] In the field of corundum smelting, the three-phase arc tilting furnace, as the main domestic smelting equipment, although it meets the production requirements to a certain extent, it is undeniable that it also has many obvious disadvantages.

[0003] In actual production scenarios, the energy consumption of the three-phase arc tilting furnace is determined by its working principle, which requires a large amount of electric energy to maintain the stability of the arc and the high-temperature environment. This not only leads to a soaring production cost, but also brings pressure to the sustainable development of enterprises in the current situation of increasingly tense energy. At the same time, high energy consumption also means a greater impact on the environment, and the increase in carbon emissions runs counter to the current global low-carbon environmental protection concept.

[0004] From the perspective of equipment maintenance, the three-phase arc tilting furnace has a complex structure and numerous components. This increases the difficulty of equipment maintenance and requires professional technicians for regular inspection and maintenance. Moreover, due to the long-term working environment of high temperature, high pressure and strong current, the wear and aging speed of components is relatively fast, and the frequency of replacing components is relatively high, which undoubtedly increases the enterprise's maintenance cost and production downtime, affecting production efficiency.

[0005] Furthermore, the temperature control of the three-phase arc tilting furnace is difficult during the smelting process. Due to the instability of the arc and the uneven distribution of substances in the furnace, it is easy to cause local overheating or insufficient temperature. The uneven temperature will directly affect the quality and performance of corundum, making it difficult to ensure the quality consistency of products. In order to achieve the ideal quality, multiple refinements and adjustments are often required, which undoubtedly increases the complexity and time cost of production. In addition, the operation safety of this kind of furnace is also an issue that cannot be ignored. The high-temperature furnace body, strong arc and potentially harmful gases all pose potential threats to the lives of operators. Once an accident occurs, it will not only cause casualties, but may also lead to serious damage to production facilities, bringing huge economic losses to the enterprise.

[0006] In terms of expanding production scale, the three-phase arc tilting furnace also has certain limitations. Due to its design and structural characteristics, it is not easy to achieve a large-scale production capacity increase. This means that when the market demand grows rapidly, enterprises may not be able to meet the market demand in time by increasing the number of equipment or improving the existing equipment, thus missing the opportunity for development.

[0007] In summary, although the three-phase arc tilting furnace plays a certain role in corundum smelting, it still has disadvantages in some aspects. Therefore, we propose a hollow single-electrode DC smelting furnace for corundum smelting to solve the above problems. Summary of the Invention

[0008] To solve at least one of the above-mentioned technical problems existing in the prior art, the present invention proposes a hollow single-electrode DC smelting furnace for corundum smelting.

[0009] The technical solution adopted by the present invention is as follows:

[0010] A hollow single-electrode DC smelting furnace for corundum smelting includes a bottom electrode assembly, a furnace body assembly, a furnace cover assembly, and a hollow electrode assembly. The bottom electrode assembly is connected to the anode of a DC power supply. The furnace body assembly is installed on the bottom electrode assembly. A product discharge port is penetrated through the lower side wall of the furnace body assembly, and a material plug is provided in the product discharge port. The furnace cover assembly is installed on the furnace body assembly. An exhaust pipe is penetrated through the furnace cover assembly. The hollow electrode assembly penetrates through the furnace cover assembly and communicates with the furnace body assembly. The hollow electrode assembly is slidably matched with the furnace cover assembly. The hollow electrode assembly is connected to the cathode of the DC power supply. An electrode clamping lifting mechanism for controlling the height adjustment of the hollow electrode assembly is provided on the hollow electrode assembly.

[0011] In a further technical solution, the bottom electrode assembly includes a bottom electrode housing. A bottom electrode insulation buffer layer is provided inside the bottom electrode housing. A bottom electrode anode current guide plate is provided inside the bottom electrode insulation buffer layer. A bottom electrode anode conductive bonding layer is provided inside the bottom electrode anode current guide plate. A bottom electrode body is provided inside the bottom electrode anode conductive bonding layer. A bottom electrode protection layer is provided on the top surface of the bottom electrode body.

[0012] In a further technical solution, the furnace body assembly includes a furnace body housing. The furnace body housing is installed on the bottom electrode assembly. A furnace body insulation buffer layer is provided inside the furnace body housing. A furnace body refractory layer is provided inside the furnace body insulation buffer layer. The product discharge port penetrates through the furnace body housing, the furnace body insulation buffer layer, and the furnace body refractory layer, and extends out from the lower side wall of the furnace body housing.

[0013] In a further technical solution, a product discharge groove is installed outside the furnace body housing of the product discharge port, and a ladle is provided below the product discharge groove.

[0014] In a further technical solution, the furnace cover assembly includes a furnace cover outer shell, which is covered on the furnace body assembly. The inner side of the furnace cover outer shell is provided with an outer shell heat-insulating material. The exhaust duct is disposed through the top surface of the furnace cover outer shell, and a through hole for the hollow electrode assembly to pass through is provided in the middle of the top surface of the furnace cover outer shell.

[0015] In a further technical solution, the hollow electrode assembly includes a cathode conductive block protective sleeve and a hollow electrode hollow pipe. The cathode conductive block protective sleeve is disposed through the furnace cover assembly and fixedly connected to the furnace cover assembly. A cathode connection terminal is provided on the cathode conductive block protective sleeve. The hollow electrode hollow pipe is slidably installed in the cathode conductive block protective sleeve, and the electrode clamping and lifting mechanism is disposed on the hollow electrode hollow pipe and fixed on the factory building floor bracket.

[0016] In a further technical solution, the electrode clamping and lifting mechanism includes a fixing plate, a connecting plate and a return spring. The fixing plate is fixedly sleeved on the hollow electrode hollow pipe. The connecting plate is movably disposed on the hollow electrode hollow pipe. The connecting plate is fixedly connected to the factory building floor bracket. The two ends of the return spring are respectively connected to the fixing plate and the connecting plate, and electromagnets that cooperate with each other are provided on the fixing plate and the connecting plate.

[0017] In a further technical solution, an automatic metering and feeding mechanism with an outlet direction aligned with the inlet of the hollow electrode assembly is further included, and the automatic metering and feeding mechanism is fixedly connected to the factory building fixed bracket.

[0018] In a further technical solution, the bottom electrode assembly, the furnace body assembly, the furnace cover assembly and the hollow electrode assembly are all cylindrical.

[0019] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0020] 1. Compared with the traditional three-phase arc tilting furnace, the present invention benefits from the characteristic that the charge column in the hollow electrode hollow pipe continuously heats up, realizes the full utilization of waste heat, greatly shortens the smelting time, not only reduces the number of electrodes, reduces electrode consumption, but also greatly reduces energy consumption, saving a large amount of costs for the enterprise.

[0021] 2. The present invention uses a direct current arc. With its high-temperature characteristic, it accelerates the melting process of the charge, thereby greatly improving the smelting efficiency. At the same time, the natural power factor of the present hollow single-electrode direct current smelting furnace is high, and it can operate stably in the power grid without additional compensation. It not only reduces the interference to the power grid, but also improves the overall energy efficiency of the smelting equipment. More importantly, due to the direct current power supply method, the inductive reactance is very low, and coupled with the simple equipment structure and only one set of short network, the impedance loss in the conductor is effectively reduced, further reducing the energy consumption of the equipment.

[0022] 3. During the smelting process of the present invention, the furnace gas generated will be introduced into the heat exchanger and dust removal facilities through the exhaust pipe for treatment. At the same time, the existence of the material column effectively blocks the hollow pipe of the hollow electrode, preventing the leakage of harmful gases generated during the smelting process to the outside, effectively protecting the environment and the health of operators, and reducing the safety hazards during the smelting process.

[0023] 4. Due to the existence of the bottom electrode protective layer in the present invention, and the bottom electrode protective layer is ferrosilicon melt, which is a good conductor. It covers the bottom electrode body to jointly form the composite anode of the smelting furnace, enabling the melt in the furnace not to directly contact the bottom electrode body, ensuring that the carbon element of the bottom electrode body is not taken away, and greatly extending the service life of the bottom electrode body.

[0024] 5. In the present invention, the formation of the furnace charge column in the hollow pipe of the hollow electrode enables, in the next smelting cycle, to directly conduct water and electricity to start the arc and quickly enter the smelting state, providing a strong guarantee for the efficient operation of this hollow single-electrode DC smelting furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described by way of examples with reference to the accompanying drawings, wherein:

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is Figure 1 a partial enlarged schematic view of part A in

[0028] Reference numerals: 1 - product discharge port, 2 - material plug, 3 - exhaust pipe, 4 - factory building floor bracket, 5 - bottom electrode housing, 6 - bottom electrode insulation buffer layer, 7 - bottom electrode anode flow guiding plate, 8 - bottom electrode anode conductive bonding layer, 9 - bottom electrode body, 10 - bottom electrode protective layer, 11 - furnace body housing, 12 - furnace body insulation buffer layer, 13 - furnace body refractory layer, 14 - product discharge tank, 15 - ladle, 16 - furnace cover housing, 17 - housing insulation material, 18 - through hole, 19 - cathode conductive block protective sleeve, 20 - hollow pipe of hollow electrode, 21 - cathode terminal, 22 - fixing plate, 23 - connecting plate, 24 - return spring, 25 - electromagnet, 26 - automatic quantitative feeding mechanism, 27 - factory building fixed bracket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0030] Refer to Figure 1 and Figure 2 The present invention provides a hollow single - electrode DC smelting furnace for corundum smelting, which includes a bottom - electrode assembly, a furnace - body assembly, a furnace - cover assembly, and a hollow - electrode assembly. The bottom - electrode assembly is connected to the anode of a DC power supply. The furnace - body assembly is installed on the bottom - electrode assembly. A product discharge port 1 is penetrated through the lower side wall of the furnace - body assembly. A material stopper 2 is arranged in the product discharge port 1. The furnace - cover assembly is installed on the furnace - body assembly. An exhaust duct 3 is penetrated through the furnace - cover assembly. The hollow - electrode assembly penetrates through the furnace - cover assembly and is communicated with the furnace - body assembly. The hollow - electrode assembly is in sliding fit with the furnace - cover assembly. The hollow - electrode assembly is connected to the cathode of the DC power supply. An electrode clamping lifting mechanism capable of controlling the height adjustment of the hollow - electrode assembly is arranged on the hollow - electrode assembly.

[0031] The working principle of this hollow single - electrode DC smelting furnace is mainly based on the high - temperature melting effect of a DC arc. During operation, the anode of the DC power supply is connected to the bottom - electrode assembly, and the cathode of the DC power supply is connected to the hollow - electrode assembly, thereby forming a DC arc between the two. The high temperature generated by this arc is used to melt the corundum raw materials in the furnace. The specific smelting steps are as follows:

[0032] First, it is necessary to confirm that all parts of the equipment are properly installed before the furnace can be opened. Before opening the furnace, the material plug 2 needs to be inserted into the product discharge port 1 in advance to prevent material leakage during the smelting process. Next, the hollow electrode assembly is connected to the cathode of the DC power supply, and the bottom electrode assembly is connected to the anode of the DC power supply. After that, the hollow electrode assembly is lowered to the bottom end to contact the bottom electrode assembly using the electrode clamping lifting mechanism. Then, the charge is put into the furnace body assembly through the hollow electrode assembly. It is worth noting that when a new furnace is opened for the first time, a certain height of the material column needs to be formed in the hollow electrode assembly before power is turned on to start the arc. After the arc is started, the material column enters the center of the arc and gradually melts under the push of its own weight and arc force. To ensure the continuity of the smelting process, it is necessary to continuously and stably feed the furnace according to the melting rate of the charge to keep the height of the material column in the hollow electrode assembly constant. As the charge continues to melt, the liquid level in the furnace body assembly continues to rise. During this process, the electrode clamping and lifting mechanism is required to raise the height of the hollow electrode assembly to maintain the stability of the voltage and current, thereby ensuring the stability of the arc and ensuring the balanced heating temperature, which is crucial to ensure that the quality of the product can be highly consistent. This process continues until all the charge is added. During the smelting process, the generated furnace gas will be introduced into the heat exchanger and dust removal facilities through the exhaust pipe 3 for treatment, which is beneficial to protecting the environment and the health of the operators and reducing the safety hazards in the smelting process. After the reduction reaction in the furnace is completely completed, the power is turned off and the smelting is completed. At this time, by pulling out the material plug 2, the product flows out from the product discharge port 1 and is collected until the product is completely exhausted. Finally, the electrode clamping and lifting mechanism is controlled to allow the hollow electrode assembly to drop to the bottom electrode assembly with the liquid level, and the material plug 2 is re-inserted. At this point, this smelting is completed. It is worth mentioning that since the smelting process is continuous and the charge column has been formed in the hollow electrode assembly, in the next smelting cycle, it is only necessary to directly pass water and electricity to start the arc to quickly enter the smelting state. Compared with the traditional three-phase arc dumping furnace, this hollow single-electrode DC smelting furnace benefits from the characteristics of the continuous heating of the charge column in the hollow electrode assembly, which realizes the full utilization of waste heat, not only reducing the number of electrodes and reducing electrode consumption, but also greatly reducing energy consumption, saving a lot of costs for the enterprise. In addition, this hollow single-electrode DC smelting furnace adopts DC arc, which accelerates the melting process of the charge with its high temperature characteristics, thereby greatly improving the smelting efficiency. At the same time, the natural power factor of this hollow single-electrode DC smelting furnace is high, and it can operate stably in the power grid without additional compensation. This feature not only reduces the interference to the power grid, but also improves the overall energy efficiency of the smelting equipment. More importantly, due to the DC power supply mode, the inductive reactance of this hollow single-electrode DC smelting furnace is very low, and the equipment structure is simple, with only one set of short nets, which effectively reduces the impedance loss in the conductor and further reduces the energy consumption of the equipment.

[0033] In further technical solutions, see Figure 1The bottom electrode assembly includes a bottom electrode shell 5, a bottom electrode insulating buffer layer 6 is provided on the inner side of the bottom electrode shell 5, a bottom electrode anode guide plate 7 is provided on the inner side of the bottom electrode insulating buffer layer 6, a bottom electrode anode conductive bonding layer 8 is provided on the inner side of the bottom electrode anode guide plate 7, a bottom electrode body 9 is provided on the inner side of the bottom electrode anode conductive bonding layer 8, and a bottom electrode protective layer 10 is provided on the top surface of the bottom electrode body 9.

[0034] The bottom electrode assembly is composed of a bottom electrode shell 5, a bottom electrode insulating buffer layer 6, a bottom electrode anode guide plate 7, a bottom electrode anode conductive bonding layer 8, a bottom electrode body 9 and a bottom electrode protective layer 10. The coordinated cooperation of these components provides a strong guarantee for the efficient and stable operation of the bottom electrode assembly. Specifically, the bottom electrode shell 5, as the outermost structure, ensures the structural stability of the bottom electrode assembly. The bottom electrode insulating buffer layer 6 on its inner side effectively enhances the insulation performance of the entire bottom electrode, which can prevent current leakage and ensure safety during the smelting process. The bottom electrode anode guide plate 7 is connected to the anode of the DC power supply, and transmits the current to the bottom electrode body 9 through the bottom electrode anode conductive bonding layer 8. This process optimizes the distribution of the current, thereby avoiding local overheating and current concentration, and extending the service life of the bottom electrode. The bottom electrode body 9 is the core component in the smelting process, which directly bears the effects of high temperature and electric arc. The bottom electrode protective layer 10 arranged thereon can effectively protect the bottom electrode body 9, reduce damage, and extend the service life of the bottom electrode body 9. It is worth mentioning that the existence of the bottom electrode protection layer 10 is of great significance for protecting the bottom electrode body 9. Since the reaction in the furnace is a reduction reaction using carbon elements, if the melt directly contacts the bottom electrode body 9, the melt will seize the carbon element in the bottom electrode body 9 to participate in the reaction, which greatly shortens the life of the bottom electrode body 9. In the production process of corundum products, carbon needs to be added as a reducing agent. At this time, iron is added as a clarifier, and some ferrosilicon will be produced after the smelting is completed. Due to its large specific gravity, ferrosilicon settles at the bottom of the furnace. The height of the product discharge port 1 of this hollow single-electrode DC smelting furnace is higher than the bottom electrode body 9, allowing part of the ferrosilicon to stay at the bottom of the furnace. Since ferrosilicon is a good conductor, after power is turned on and melted, a layer of ferrosilicon melt is covered on the bottom electrode body 9. This layer of ferrosilicon solution and the bottom electrode body 9 together form a composite anode of the smelting furnace, so that the melt in the furnace does not directly contact the bottom electrode body 9, ensuring that the carbon element of the bottom electrode body 9 is not seized, greatly extending the service life of the bottom electrode body 9.

[0035] In further technical solutions, see Figure 1, the furnace body assembly includes a furnace body outer shell 11, the furnace body outer shell 11 is installed on the bottom electrode assembly, a furnace body insulation buffer layer 12 is provided inside the furnace body outer shell 11, and a furnace body refractory layer 13 is provided inside the furnace body insulation buffer layer 12. The product discharge port 1 penetrates through the furnace body outer shell 11, the furnace body insulation buffer layer 12 and the furnace body refractory layer 13, and extends out from the lower side wall of the furnace body outer shell 11.

[0036] The furnace body assembly is composed of a furnace body outer shell 11, a furnace body insulation buffer layer 12 and a furnace body refractory layer 13, ensuring the efficient, safe and stable operation of the furnace body assembly during the smelting process. Specifically, the furnace body outer shell 11, as the outermost structure, ensures the overall stability of the furnace body assembly. The furnace body insulation buffer layer 12 is located between the furnace body outer shell 11 and the furnace body refractory layer 13, playing a key insulation role and effectively reducing heat loss, thus reducing energy consumption. The furnace body refractory layer 13 directly bears high temperature, maintaining the stability of the melting environment inside the furnace, thereby ensuring the durability and reliability of the smelting process. And the product discharge port 1 penetrates through the furnace body outer shell 11, the furnace body insulation buffer layer 12 and the furnace body refractory layer 13, ensuring the smooth outflow of the product after smelting.

[0037] In a further technical solution, refer to Figure 1 , a product discharge groove 14 is installed outside the furnace body outer shell 11 of the product discharge port 1, and a ladle 15 is provided below the product discharge groove 14.

[0038] The product discharge port 1 accurately guides the product after smelting into the ladle 15 through the product discharge groove 14, facilitating the collection, metering and transportation work, avoiding material scattering, and improving the accuracy and controllability of the production process.

[0039] In a further technical solution, refer to Figure 1 , the furnace cover assembly includes a furnace cover outer shell 16, the furnace cover outer shell 16 covers the furnace body assembly, an outer shell heat insulation material 17 is provided inside the furnace cover outer shell 16, an exhaust pipe 3 is disposed through the top surface of the furnace cover outer shell 16, and a through hole 18 for the hollow electrode assembly to pass through is provided in the middle of the top surface of the furnace cover outer shell 16.

[0040] The furnace lid assembly is composed of a furnace lid outer shell 16 and an outer shell heat insulation material 17. The furnace lid outer shell 16 is covered on the furnace body assembly, and the outer shell heat insulation material 17 is filled inside it, which can effectively reduce the transfer of heat in the furnace to the outside world, maintain the stability of the high-temperature environment in the furnace, thereby reducing energy consumption and improving the smelting efficiency. The exhaust pipe 3 on the furnace lid outer shell 16 can discharge the furnace gas generated during the smelting process into the heat exchanger and dust removal facilities, ensuring the cleanliness of the operating environment and further protecting the health and safety of the operators. The hollow electrode assembly is installed in the through hole 18 in the middle of the top surface of the furnace lid outer shell 16, providing a strong guarantee for the efficient, safe and stable operation of this hollow single-electrode DC smelting furnace.

[0041] In a further technical solution, referring to Figure 1 , the hollow electrode assembly includes a cathode conductive block protective sleeve 19 and a hollow electrode hollow pipe 20. The cathode conductive block protective sleeve 19 is penetrated and arranged on the furnace lid assembly and fixedly connected to the furnace lid assembly. A cathode terminal 21 is arranged on the cathode conductive block protective sleeve 19. The hollow electrode hollow pipe 20 is slidably installed in the cathode conductive block protective sleeve 19. The electrode clamping and lifting mechanism is arranged on the hollow electrode hollow pipe 20 and fixed on the factory building floor bracket 4.

[0042] The hollow electrode assembly is composed of a cathode conductive block protective sleeve 19 and a hollow electrode hollow pipe 20. Among them, the cathode conductive block protective sleeve 19 is fixedly installed on the furnace lid assembly, and the hollow electrode hollow pipe 20 is slidably installed in the cathode conductive block protective sleeve 19. The cathode conductive block protective sleeve 19 not only connects to the cathode of the DC power supply through the cathode terminal 21, thereby transmitting the current to the hollow electrode hollow pipe 20 for use in the smelting process, but also isolates between the hollow electrode hollow pipe 20 and the furnace lid assembly, improving the safety of the smelting operation. The hollow electrode hollow pipe 20 can not only be used as a channel for adding materials, but also form a material column, improving the utilization rate of waste heat, greatly shortening the smelting time and reducing energy consumption. At the same time, the existence of the material column effectively blocks the hollow electrode hollow pipe 20, preventing the leakage of harmful gases generated during the smelting process and effectively protecting the health and safety of the operators.

[0043] In a further technical solution, referring to Figure 2 , the electrode clamping and lifting mechanism includes a fixing plate 22, a connecting plate 23 and a return spring 24. The fixing plate 22 is fixedly sleeved on the hollow electrode hollow pipe 20. The connecting plate 23 is movably arranged on the hollow electrode hollow pipe 20. The connecting plate 23 is fixedly connected to the factory building floor bracket 4. The two ends of the return spring 24 are respectively connected to the fixing plate 22 and the connecting plate 23. Electromagnets 25 are arranged on the fixing plate 22 and the connecting plate 23 in a matching manner.

[0044] The electrode clamping and lifting mechanism, through the cooperative action of the fixing plate 22, the connecting plate 23, the return spring 24, and the electromagnet 25, generates a strong attraction force between the electromagnets 25 when powered on. Since the connecting plate 23 is fixedly connected to the factory building floor bracket 4, the electromagnet 25 attracts the fixing plate 22 to move upward, and the fixing plate 22 drives the hollow pipe 20 of the hollow electrode to rise, thereby increasing the height of the hollow pipe 20 of the hollow electrode to maintain the stability of the voltage and current, and thus ensuring the stability of the electric arc. It is worth mentioning that in the electrode clamping and lifting mechanism, a current controller is usually also equipped to control the magnitude of the current input to the electromagnet 25, thereby realizing the control of the attraction force magnitude, making the rise of the hollow pipe 20 of the hollow electrode more stable, and effectively ensuring the stability of the electric arc. On the contrary, gradually reducing the current input to the electromagnet 25, under the attraction force and the elastic potential energy of the return spring 24, the hollow pipe 20 of the hollow electrode will slowly descend.

[0045] In a further technical solution, referring to Figure 1 , it further includes an automatic quantitative feeding mechanism 26 with the discharge port direction aligned with the feeding port of the hollow electrode assembly. The automatic quantitative feeding mechanism 26 is fixedly connected to the factory building fixed bracket 27.

[0046] Through the automatic quantitative feeding mechanism 26, materials can be efficiently and accurately added to the hollow pipe 20 of the hollow electrode in a quantitative manner, thereby ensuring that the height of the material column in the hollow pipe 20 of the hollow electrode remains unchanged. This not only improves the efficiency and accuracy of the smelting operation, avoids errors and delays that may be caused by manual feeding, but also reduces the labor intensity and enhances the adaptability of the equipment through its intelligent and automated operation mode, effectively ensuring the smelting quality, and bringing significant beneficial effects to the production practice of the smelting industry.

[0047] In a further technical solution, the bottom electrode assembly, the furnace body assembly, the furnace cover assembly, and the hollow electrode assembly are all cylindrical.

[0048] The cylindrical design is conducive to the uniform distribution of heat, enabling the heating conditions of each part to be consistent during the smelting process, avoiding problems such as local overheating or low thermal efficiency. This not only improves the smelting efficiency but also reduces the manufacturing cost and maintenance difficulty.

[0049] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A hollow single-electrode DC smelting furnace for corundum smelting, characterized in that, It includes a bottom electrode assembly, a furnace body assembly, a furnace cover assembly and a hollow electrode assembly. The bottom electrode assembly is connected to the anode of a DC power supply. The furnace body assembly is installed on the bottom electrode assembly. A product discharge port (1) is penetrated and arranged on the lower side wall of the furnace body assembly. A material plug (2) is arranged in the product discharge port (1). The furnace cover assembly is installed on the furnace body assembly. An exhaust pipe (3) is penetrated and arranged on the furnace cover assembly. The hollow electrode assembly penetrates through the furnace cover assembly and communicates with the furnace body assembly. The hollow electrode assembly is slidably matched with the furnace cover assembly. The hollow electrode assembly is connected to the cathode of the DC power supply. An electrode clamping lifting mechanism for controlling the height adjustment of the hollow electrode assembly is arranged on the hollow electrode assembly. Among them, the bottom electrode assembly includes a bottom electrode outer shell (5). A bottom electrode insulating buffer layer (6) is arranged inside the bottom electrode outer shell (5). A bottom electrode anode flow guiding plate (7) is arranged inside the bottom electrode insulating buffer layer (6). A bottom electrode anode conductive bonding layer (8) is arranged inside the bottom electrode anode flow guiding plate (7). A bottom electrode body (9) is arranged inside the bottom electrode anode conductive bonding layer (8). A bottom electrode protection layer (10) is arranged on the top surface of the bottom electrode body (9). The hollow electrode assembly includes a cathode conductive block protective sleeve (19) and a hollow electrode hollow pipe (20). The cathode conductive block protective sleeve (19) is penetrated and arranged on the furnace cover assembly and is fixedly connected to the furnace cover assembly. A cathode connection terminal (21) is arranged on the cathode conductive block protective sleeve (19). The hollow electrode hollow pipe (20) is slidably installed inside the cathode conductive block protective sleeve (19). The electrode clamping lifting mechanism is arranged on the hollow electrode hollow pipe (20) and is fixed on a factory building floor bracket (4). It further includes an automatic metering feeding mechanism (26) whose discharge port is aligned with the feeding port of the hollow electrode assembly. The automatic metering feeding mechanism (26) is fixedly connected to a factory building fixed bracket (27).

2. The hollow single-electrode DC smelting furnace for corundum smelting according to claim 1, characterized in that, The furnace body assembly includes a furnace body outer shell (11). The furnace body outer shell (11) is installed on the bottom electrode assembly. A furnace body insulating buffer layer (12) is arranged inside the furnace body outer shell (11). A furnace body refractory layer (13) is arranged inside the furnace body insulating buffer layer (12). The product discharge port (1) penetrates through the furnace body outer shell (11), the furnace body insulating buffer layer (12) and the furnace body refractory layer (13) and extends out from the lower side wall of the furnace body outer shell (11).

3. The hollow single-electrode DC smelting furnace for corundum smelting according to claim 2, characterized in that, A product discharge groove (14) is installed on the outer side of the furnace body outer shell (11) of the product discharge port (1). A receiving bag (15) is arranged below the product discharge groove (14).

4. A hollow single-electrode DC smelting furnace for corundum smelting according to claim 1, characterized in that, The furnace cover assembly includes a furnace cover outer shell (16). The furnace cover outer shell (16) covers the furnace body assembly. An outer shell heat preservation material (17) is arranged inside the furnace cover outer shell (16). The exhaust pipe (3) is penetrated and arranged on the top surface of the furnace cover outer shell (16). A through hole (18) for the hollow electrode assembly to pass through is arranged in the middle of the top surface of the furnace cover outer shell (16).

5. A hollow single-electrode DC smelting furnace for corundum smelting according to claim 1, characterized in that, The electrode clamping lifting mechanism includes a fixing plate (22), a connecting plate (23) and a return spring (24). The fixing plate (22) is fixedly sleeved on the hollow pipe (20) of the hollow electrode. The connecting plate (23) is movably arranged on the hollow pipe (20) of the hollow electrode. The connecting plate (23) is fixedly connected to the factory building floor bracket (4). The two ends of the return spring (24) are respectively connected to the fixing plate (22) and the connecting plate (23). Electromagnets (25) which cooperate with each other are arranged on the fixing plate (22) and the connecting plate (23).

6. A hollow single-electrode DC smelting furnace for corundum smelting according to claim 1, characterized in that, The bottom electrode assembly, the furnace body assembly, the furnace cover assembly and the hollow electrode assembly are all cylindrical.

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