Electric smelting furnace and method for increasing deslagging rate of electric smelting furnace

Abstract

The invention belongs to the technical field of metallurgy, and particularly discloses a smelting electric furnace and a method for increasing the deslagging rate of the smelting electric furnace. The smelting electric furnace comprises a furnace body, a slag outlet and a slag outlet pipe, wherein the furnace body is provided with a slag outlet; and the ultrasonic transmitter is arranged on the inner side of the furnace body and used for transmitting ultrasonic waves to directionally push smelting slag in the furnace body to move towards the slag outlet. The method for increasing the slag tapping rate of the smelting electric furnace comprises the following steps that an ultrasonic transmitter is arranged on the inner side of a furnace body of the smelting electric furnace; and in the deslagging stage of the electric furnace, the ultrasonic transmitter is started, and the smelting slag in the furnace body is directionally pushed to move towards a slag outlet through transmitted ultrasonic waves. According to the electric furnace, the ultrasonic transmitter is arranged on the inner side of the furnace body, and the smelting slag can be directionally pushed to the slag outlet by utilizing the characteristics that ultrasonic waves are energy waves and have good directionality and the like, so that the slag discharging rate of the electric furnace is increased, the production period is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of metallurgy, and particularly relates to a smelting electric furnace and a method for improving the slag discharging rate of the smelting electric furnace. Background Art

[0002] The high-temperature carbonization electric furnace for titanium-bearing blast furnace slag uses liquid titanium-bearing blast furnace slag and coke powder as raw materials, and a three-phase AC electric furnace as a reaction vessel. Through a reduction carbonization reaction, a liquid carbonized slag containing 13.5% - 14.0% (mass fraction) of TiC is obtained. Due to the presence of TiC, the viscosity of the carbonized slag is much greater than that of general slag. Currently, the slag discharging of the electric furnace can only rely on the self-static pressure of the liquid carbonized slag to flow out from the slag discharging port of the electric furnace, resulting in a much slower slag discharging rate of the electric furnace compared with general slag, a longer production cycle, and a lower production efficiency.

[0003] In view of this, it is desirable to provide a method for improving the slag discharging rate of the carbonized slag smelting electric furnace. Summary of the Invention

[0004] Aiming at the deficiencies of the above-mentioned existing technologies, the present invention provides a smelting electric furnace and a method for improving the slag discharging rate of the smelting electric furnace, aiming to improve the slag discharging rate of the electric furnace, thereby shortening the production cycle and improving the production efficiency.

[0005] To achieve the above object, the present invention adopts the following technical solutions: According to the first aspect of the present invention, there is provided a smelting electric furnace, which includes: A furnace body provided with a slag discharging port; and An ultrasonic transmitter disposed inside the furnace body, the ultrasonic transmitter being configured to emit ultrasonic waves to directionally push the smelting slag located inside the furnace body towards the slag discharging port.

[0006] According to some embodiments of the present invention, the ultrasonic transmitter is disposed at the height of the slag discharging port on the furnace body.

[0007] According to some embodiments of the present invention, the furnace body includes a cylindrical side wall, and both the slag discharging port and the ultrasonic transmitter are disposed on the cylindrical side wall.

[0008] According to some embodiments of the present invention, a plurality of ultrasonic transmitters are disposed inside the furnace body, and the plurality of ultrasonic transmitters are evenly spaced along the circumferential direction of the cylindrical side wall. Among them, the ultrasonic transmitter facing the slag discharging port emits ultrasonic waves towards the slag discharging port, and the remaining ultrasonic transmitters emit ultrasonic waves towards the center of the cylinder.

[0009] According to some embodiments of the present invention, three ultrasonic transmitters are arranged inside the furnace body, wherein the first ultrasonic transmitter is arranged facing the slag discharge port, and the other two ultrasonic transmitters are radially spaced 90 degrees apart from the first ultrasonic transmitter.

[0010] According to some embodiments of the present invention, the working power of the first ultrasonic transmitter is 1.5 to 2 times that of the other two ultrasonic transmitters.

[0011] According to some embodiments of the present invention, the furnace body includes a furnace shell wall and a furnace wall located inside the furnace shell wall, and the ultrasonic transmitter is arranged inside the furnace shell wall and outside the furnace wall.

[0012] According to some embodiments of the present invention, the furnace body includes a connected side wall and a furnace bottom, and the slag discharge port is arranged at a position on the cylindrical side wall close to the furnace bottom.

[0013] According to a second aspect of the present invention, a method for improving the slag discharge rate of a smelting electric furnace is provided, which includes the following steps: Arrange ultrasonic transmitters inside the furnace body of the smelting electric furnace; During the slag discharge stage of the electric furnace, start the ultrasonic transmitter, and use the emitted ultrasonic waves to directionally push the smelting slag located inside the furnace body towards the slag discharge port to move.

[0014] According to some embodiments of the present invention, the method is applicable to a carbide slag smelting electric furnace.

[0015] Adopting the above technical solutions, the present invention has the following beneficial effects: The smelting electric furnace provided by the present invention can use the characteristics that ultrasonic waves are an energy wave and have good directivity, etc., to directionally push the smelting slag towards the slag discharge port by arranging ultrasonic transmitters inside the furnace body, thereby improving the slag discharge rate of the electric furnace, shortening the production cycle, and improving production efficiency.

[0016] The method for improving the slag discharge rate of a smelting electric furnace provided by the present invention can use the emitted ultrasonic waves to directionally push the smelting slag towards the slag discharge port by arranging ultrasonic transmitters inside the furnace body and starting the ultrasonic transmitter during the slag discharge stage of the electric furnace, thereby improving the slag discharge rate of the electric furnace, shortening the production cycle, and improving production efficiency. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 The schematic front view of the smelting electric furnace provided by an embodiment of the present invention; Figure 2 The schematic top view of the smelting electric furnace provided by an embodiment of the present invention; Figure 3 The flowchart of the method for improving the slag discharging rate of the smelting electric furnace provided by the present invention.

[0019] Description of the reference numerals 1 Furnace body; 11 Furnace shell wall; 12 Furnace wall; 2 Slag discharging port; 3 Ultrasonic transmitter; 31 First ultrasonic transmitter; 32 Second ultrasonic transmitter; 33 Third ultrasonic transmitter; 4 Cavity; 5 Furnace bottom; A Center line. Detailed implementation manners

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the following further describes the embodiments of the present invention in detail with reference to specific embodiments and the accompanying drawings.

[0021] It should be noted that in the description of the present invention, the orientation or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "longitudinal", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0022] In the description of the present invention, the terms "include", "comprise", "have", etc. indicate non-exclusive inclusion. The terms "first", "second", "third", etc. are used to distinguish different objects, rather than to describe a specific order. The meaning of "a plurality" refers to two or more, unless otherwise specifically defined.

[0023] In the description of the present invention, when an element is referred to as being "fixed to" or "mounted on" or "disposed on" or "connected to" another element, it can be directly or indirectly located on that another element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to that another element.

[0024] It should be noted that the specific structure, features, advantages, etc. of the present invention will be specifically described below by way of examples. However, all descriptions are only for illustration and should not be construed as forming any limitation to the present invention. In addition, any single technical feature described or implied in each embodiment mentioned herein, or any single technical feature shown or implied in each drawing, can still be arbitrarily combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned herein.

[0025] As mentioned in the background art section, existing smelting electric furnaces usually rely only on the self-electrostatic force of the liquid smelting slag to discharge the smelting slag from the slag outlet of the electric furnace, resulting in a slow slag discharge rate of the electric furnace, a relatively long production cycle, and a low production efficiency. Therefore, the present invention aims to use ultrasonic waves to directionally push the smelting slag towards the slag outlet to increase the slag discharge rate of the smelting electric furnace, thereby shortening the production cycle and improving the production efficiency.

[0026] The first aspect of the present invention provides a smelting electric furnace, as Figure 1 and Figure 2 shown, the smelting electric furnace includes: a furnace body 1, the furnace body 1 is provided with a slag outlet 2; and an ultrasonic transmitter 3 disposed inside the furnace body 1, the ultrasonic transmitter 3 is used to emit ultrasonic waves to directionally push the smelting slag located inside the furnace body 1 towards the slag outlet 2.

[0027] The furnace body 1 is the main structure of the smelting electric furnace, which forms a cavity 4 for accommodating smelting raw materials. The inside of the furnace body 1 refers to the side of the furnace body 1 facing the cavity 4.

[0028] Ultrasonic waves refer to sound waves with frequencies higher than the human hearing range (20 Hz to 20 kHz), and their frequencies are generally between 1 MHz and 10 MHz. The main characteristics of ultrasonic waves are short wavelengths, approximately propagating in a straight line, and having small attenuation in solids and liquids.

[0029] The ultrasonic transmitter 3 is the core component for generating ultrasonic waves. The principle of the ultrasonic transmitter 3 is to convert electrical energy into mechanical energy using the piezoelectric effect and emit ultrasonic waves through vibration. The ultrasonic transmitter 3 usually consists of a piezoelectric ceramic sheet and a metal plate. The piezoelectric ceramic sheet is the key component of the ultrasonic transmitter 3, which can convert the input electrical signal into mechanical vibration. When an electrical signal is applied to the piezoelectric ceramic sheet, due to the piezoelectric effect, the ceramic sheet will vibrate. This vibration will be transmitted to the metal plate, causing it to vibrate as well. The vibration of the metal plate will cause the compression and expansion of compressed air, thereby generating ultrasonic waves.

[0030] The smelting electric furnace provided by the present invention can use the characteristics that ultrasonic wave is an energy wave and has good directivity to push the smelting slag towards the slag outlet 2 by arranging ultrasonic wave transmitters 3 inside the furnace body 1, thereby improving the slag discharging rate of the electric furnace, shortening the production cycle and improving the production efficiency.

[0031] In some embodiments, the ultrasonic wave transmitter 3 is arranged at the height of the slag outlet 2 on the furnace body 1, so that the ultrasonic wave transmitter 3 can emit ultrasonic waves towards the slag outlet 2 to push the smelting slag towards the slag outlet 2 directionally. Specifically, in the shown embodiment, the slag outlet 2 has a center line A, and the ultrasonic wave transmitter 3 is installed at the height where the center line A of the slag outlet 2 on the furnace body 1 is located, which is convenient for the ultrasonic wave transmitter 3 to emit ultrasonic waves towards the slag outlet 2, reducing or minimizing the reflection during the propagation of ultrasonic waves and improving the efficiency of the ultrasonic wave pushing the smelting slag towards the slag outlet directionally.

[0032] In some embodiments, the furnace body 1 includes a cylindrical side wall, and both the slag outlet 2 and the ultrasonic wave transmitter 3 are arranged on the cylindrical side wall. Specifically, in the shown embodiment, the furnace body 1 is cylindrical and includes a cylindrical side wall. It should be understood that the concept of the present invention is not limited to this, and the furnace body 1 can also be set to be square.

[0033] In some embodiments, a plurality of ultrasonic wave transmitters 3 are arranged inside the furnace body 1, and the plurality of ultrasonic wave transmitters 3 are evenly spaced along the circumferential direction of the cylindrical side wall. These ultrasonic sensors 3 work together to push the smelting slag towards the slag outlet 2 directionally. Among them, the ultrasonic wave transmitter arranged opposite to the slag outlet 2 is the main energy source, which emits ultrasonic waves towards the slag outlet 2 and is responsible for pushing the liquid slag in the furnace towards the slag outlet 2. The remaining ultrasonic wave transmitters are auxiliary energy sources, which emit ultrasonic waves towards the center of the cylinder and are responsible for pushing the liquid slag in the furnace towards the center position of the cylinder, so that the liquid slag in the furnace can finally enter the energy direction emitted by the ultrasonic wave transmitter arranged opposite to the slag outlet 2 and finally flow towards the slag outlet 2. The working power of the ultrasonic wave transmitter arranged opposite to the slag outlet 2 is different from (preferably higher than) the working power of the remaining ultrasonic wave transmitters. Such a setting helps the energy waves emitted by the remaining ultrasonic wave transmitters to push the liquid slag in the furnace to the center position of the cylinder without forming too strong interference to the energy waves emitted by the ultrasonic wave transmitter arranged opposite to the slag outlet 2.

[0034] For example, in the illustrated embodiment, three ultrasonic transmitters 3 are provided inside the furnace body 1. Among them, the first ultrasonic transmitter 31 is disposed opposite to the slag discharge port 2, and the other two ultrasonic transmitters (i.e., the second ultrasonic transmitter 32 and the third ultrasonic transmitter 33) are radially spaced 90 degrees from the first ultrasonic transmitter 31. These three ultrasonic transmitters 3 all emit ultrasonic waves towards the center of the cylinder to jointly and directionally push the smelting slag towards the slag discharge port 2. Among them, the first ultrasonic transmitter 31 is the main energy source, responsible for pushing the liquid slag in the furnace towards the slag discharge port 2. The second ultrasonic transmitter 32 and the third ultrasonic transmitter 33 are auxiliary energy sources, responsible for pushing the liquid slag in the furnace towards the center position of the cylinder, so that the liquid slag in the furnace can finally enter the energy direction emitted by the first ultrasonic transmitter 31 and finally flow towards the slag discharge port 2.

[0035] In some embodiments, the operating power of the first ultrasonic transmitter 31 is higher than that of the other two ultrasonic transmitters (i.e., the second ultrasonic transmitter 32 and the third ultrasonic transmitter 33). Preferably, the operating power of the first ultrasonic transmitter 31 is 1.5 to 2 times that of the other two ultrasonic transmitters. Such a setting helps the energy waves emitted by the second ultrasonic transmitter 32 and the third ultrasonic transmitter 33 to push the liquid slag in the furnace to the center position of the cylinder without forming too strong interference with the energy waves emitted by the first ultrasonic transmitter 31. Similarly, if the operating power of the first ultrasonic transmitter 31 is too large, it will form too strong interference with the energy waves emitted by the second ultrasonic transmitter 32 and the third ultrasonic transmitter 33.

[0036] In some embodiments, the furnace body 1 includes a furnace shell wall 11 and a furnace wall 12 located inside the furnace shell wall 11. The ultrasonic transmitter 3 is disposed inside the furnace shell wall 11 and outside the furnace wall 12. In other words, the ultrasonic transmitter 3 is disposed between the furnace shell wall 11 and the furnace wall 12. The furnace wall 12 is a brick wall composed of a refractory layer, a heat-insulating layer and a heat-insulating layer to protect the furnace shell wall 11 and reduce heat loss. Disposing the ultrasonic transmitter 3 inside the furnace shell wall 11 and outside the furnace wall 12 aims to protect the ultrasonic transmitter 3 from being affected by high temperature. Specifically, in the illustrated embodiment, the ultrasonic transmitter 3 is fixedly disposed inside the furnace shell wall 11.

[0037] In some embodiments, the furnace body 1 includes a side wall and a furnace bottom 5 connected to each other. The slag discharge port 2 is disposed at a position on the side wall close to the furnace bottom 5. In other words, the slag discharge port 2 is disposed at the connection between the side wall and the furnace bottom 5, and the slag discharge port 2 is higher than the furnace bottom 5 in the horizontal direction for discharging the smelting slag after the reaction is completed.

[0038] The second aspect of the present invention provides a method for improving the slag discharge rate of a smelting electric furnace, such as Figure 3As shown in the figure, the method includes the following steps: S1: Arrange ultrasonic transmitters 3 inside the furnace body 1 of the smelting electric furnace; S2: During the slag tapping stage of the electric furnace, start the ultrasonic transmitter 3, and use the emitted ultrasonic waves to directionally push the smelting slag located inside the furnace body 1 towards the slag tapping port 2 to move.

[0039] The method for improving the slag tapping rate of the smelting electric furnace provided by the present invention arranges an ultrasonic transmitter 3 inside the furnace body 1. During the slag tapping stage of the electric furnace, by starting the ultrasonic transmitter 3, the emitted ultrasonic waves can be used to directionally push the smelting slag towards the slag tapping port 2 to move, improve the slag tapping rate of the electric furnace, thereby shortening the production cycle and improving the production efficiency.

[0040] The method for improving the slag tapping rate of the smelting electric furnace provided by the present invention is applicable to the carbide slag smelting electric furnace, especially the high-temperature carbide electric furnace of titanium-containing blast furnace slag mentioned in the background technology part. When tapping slag from the electric furnace, it can improve the slag tapping rate of the liquid carbide slag with a relatively high viscosity, thereby shortening the production cycle and improving the production efficiency. The method provided by the present invention is also applicable to improving the slag tapping rate of other slags with a relatively high viscosity.

[0041] The method for improving the slag tapping rate of the smelting electric furnace provided by the present invention is applicable to be used in combination with the smelting electric furnace described in the first aspect of the present invention.

[0042] The following further elaborates the present invention in combination with embodiments, and implements the present invention with a scaled-down carbide slag smelting electric furnace and an ultrasonic transmitter model as a platform: Embodiment 1 In the scaled-down carbide slag smelting electric furnace and ultrasonic transmitter model, 3 ultrasonic transmitters are arranged on the wall of the circular carbide slag smelting electric furnace shell. Their position distribution is as follows: In the circumferential direction: directly opposite the slag tapping port of the electric furnace and 90° on each side; In the vertical direction: at the horizontal height of the center line of the slag tapping port. During the slag tapping stage of the electric furnace, start the ultrasonic transmitter. The working power of the ultrasonic transmitter directly opposite the slag tapping port of the electric furnace is 1.5 times that of the ultrasonic transmitters at 90° on each side.

[0043] Calculated according to the slag tapping rate of the scaled-down carbide slag smelting electric furnace and ultrasonic transmitter model, the slag tapping rate of the carbide slag smelting electric furnace can be increased by 30%.

[0044] Embodiment 2 In the scaled-down carbide slag smelting electric furnace and ultrasonic transmitter model, 3 ultrasonic transmitters are arranged on the wall of the circular carbide slag smelting electric furnace shell. Their position distribution is as follows: In the circumferential direction: directly opposite the slag tapping port of the electric furnace and 90° on each side; In the vertical direction: at the horizontal height of the center line of the slag tapping port. During the slag tapping stage of the electric furnace, start the ultrasonic transmitter. The working power of the ultrasonic transmitter directly opposite the slag tapping port of the electric furnace is 2 times that of the ultrasonic transmitters at 90° on each side.

[0045] Based on the calculation of the slag discharging rate of the electric furnace for smelting carbide slag with a reduced-scale model of the carbide slag smelting electric furnace and the ultrasonic emitter, the slag discharging rate of the carbide slag smelting electric furnace can be increased by 50%.

[0046] In summary, by arranging ultrasonic emitters on the inner side of the furnace body, the present invention can utilize the characteristics that ultrasonic waves are a kind of energy wave and have good directivity, etc., to push the smelting slag towards the slag discharging port directionally, thereby increasing the slag discharging rate of the electric furnace, shortening the production cycle, and improving the production efficiency.

[0047] The above are exemplary embodiments disclosed by the present invention. The order of disclosure of the above embodiments of the present invention is only for description and does not represent the superiority or inferiority of the embodiments. However, it should be noted that any discussion of the above embodiments is only exemplary and is not intended to imply that the scope of disclosure of the embodiments of the present invention (including the claims) is limited to these examples. Without departing from the scope defined by the claims, various changes and modifications can be made. In addition, although the elements disclosed in the embodiments of the present invention can be described or claimed in individual form, they can also be understood as multiple unless explicitly limited to the singular.

[0048] Those of ordinary skill in the art should understand that any discussion of the above embodiments is only exemplary and is not intended to imply that the scope of disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the idea of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other variations in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included in the protection scope of the embodiments of the present invention.

Claims

1. A smelting electric furnace, characterized in that: include: A furnace body, wherein the furnace body is provided with a slag outlet; as well as An ultrasonic transmitter is arranged inside the furnace body, and is used for transmitting ultrasonic waves to directionally push the smelting slag in the furnace body to move toward the slag outlet.

2. The smelting electric furnace according to claim 1, characterized in that: The ultrasonic transmitter is arranged on the furnace body at the height of the slag outlet.

3. The smelting electric furnace according to claim 1, characterized in that: The furnace body comprises a cylindrical side wall, and the slag outlet and the ultrasonic transmitter are both arranged on the cylindrical side wall.

4. The smelting electric furnace according to claim 3, characterized in that: A plurality of ultrasonic transmitters are arranged inside the furnace body, and the plurality of ultrasonic transmitters are evenly spaced along the circumferential direction of the cylindrical side wall. The ultrasonic transmitter arranged opposite the slag outlet transmits ultrasonic waves toward the slag outlet, and the remaining ultrasonic transmitters transmit ultrasonic waves toward the center of the cylinder.

5. The smelting electric furnace according to claim 4, characterized in that: Three ultrasonic transmitters are arranged inside the furnace body, wherein the first ultrasonic transmitter is arranged facing the slag outlet, and the other two ultrasonic transmitters are radially spaced 90 degrees from the first ultrasonic transmitter.

6. The smelting electric furnace according to claim 5, characterized in that: The operating power of the first ultrasonic transmitter is 1.5 to 2 times the operating power of the other two ultrasonic transmitters.

7. The smelting electric furnace according to claim 1, characterized in that: The furnace body comprises a furnace shell wall and a furnace wall located inside the furnace shell wall, and the ultrasonic transmitter is arranged inside the furnace shell wall and outside the furnace wall.

8. The smelting electric furnace according to claim 1, characterized in that: The furnace body comprises a side wall and a furnace bottom which are connected to each other, and the slag outlet is arranged at a position on the side wall close to the furnace bottom.

9. A method for increasing the slag discharge rate of a smelting electric furnace, characterized in that: The following steps are involved: An ultrasonic transmitter is arranged inside the furnace body of the smelting electric furnace; During the slag tapping stage of the electric furnace, the ultrasonic transmitter is started to directionally push the smelting slag in the furnace body toward the slag tapping port through the emitted ultrasonic waves.

10. The method for increasing the slag discharge rate of a smelting electric furnace according to claim 9, characterized in that: The method is applicable to a carburized slag smelting electric furnace.

Images