Hot blast furnace slag buffer storage device, docking system and its usage method

Abstract

This invention relates to the field of metallurgical equipment, and discloses a hot blast furnace slag buffer storage device, a docking system, and its usage method. The device includes a furnace body, a furnace cover, a slag discharge mechanism, and a drive mechanism. The furnace body has a slag inlet and a slag outlet. The furnace cover is rotatably connected to the furnace body and can close the slag inlet; a heating device is provided on the furnace cover. The slag discharge mechanism includes a refractory plug and a refractory plug opening assembly. The refractory plug closes the slag outlet, and the refractory plug opening assembly is controlled to break the refractory plug and open the slag outlet. The drive mechanism carries the furnace body and can drive the furnace body to move and / or tilt. This device effectively retains sensible heat; rapid transfer and heating compensation increase the furnace inlet temperature by more than 100°C, and reduce the main electric furnace power consumption by 15-20%. The system completely eliminates the chute, directly docking "furnace to furnace," fundamentally eliminating the problem of slag adhesion in the chute, reducing labor intensity, eliminating manual chute cleaning operations, and improving safety.

Description

Technical Field

[0001] This invention relates to the field of metallurgical equipment, specifically to a hot blast furnace slag buffer storage device, a docking system, and a method of using the same. Background Technology

[0002] Vanadium-titanium magnetite is a complex symbiotic mineral containing multiple valuable elements such as iron, vanadium, and titanium. Blast furnace smelting is the main way to achieve comprehensive utilization of iron and vanadium resources. During blast furnace ironmaking, a large amount of high-temperature hot blast furnace slag is generated, which contains abundant sensible heat and valuable components such as TiO2 and V2O5. Directly adding hot blast furnace slag to an electric arc furnace for smelting and extraction of valuable metals can save energy and improve economic efficiency, representing an important development direction for the resource utilization of metallurgical solid waste. Compared with ordinary iron ore, during the reduction process of vanadium-titanium magnetite in the blast furnace, the entry of titanium oxides into the slag leads to increased slag viscosity and decreased fluidity.

[0003] Currently, the hot blast furnace slag is fed into the furnace by transporting it into the plant via slag hopper cars. The slag is then pulled to a waiting position by a traction device. After the main smelting furnace finishes smelting, the slag hopper is weighed, the shell is broken, and the slag is pulled to the slag tipping position. The slag hopper is tipped over, and the hot slag flows into the electric furnace along the furnace chute. The empty hopper is weighed. If the amount of slag tipped meets the requirements, the tipping ends; if the amount of slag tipped does not meet the requirements, the tipping continues. However, this method of feeding hot blast furnace slag into the furnace has the following technical defects: (1) large temperature loss: the open chute causes a large amount of sensible heat loss of the hot slag, the temperature of the slag entering the furnace drops, and the smelting power consumption of the main electric furnace increases; (2) serious slag adhesion in the chute: the vanadium-titanium magnetite slag has high viscosity. When the hot slag flows on the chute, it is easy to form a crust and adhere to the chute due to the rapid heat dissipation of the surface. It needs to be manually cleaned after the slag is turned over. This not only has high labor intensity and safety hazards, but also requires the furnace to be stopped for cleaning when there is too much slag, which reduces production efficiency; (3) low slag turning efficiency: the operation of a single slag tank requires one-by-one alignment, turning, and weighing, which takes up to 40 to 70 minutes, which seriously restricts the production efficiency of the main electric furnace.

[0004] Therefore, there is still much room for improvement in the existing methods of feeding hot blast furnace slag into the furnace. Summary of the Invention

[0005] The main objective of this invention is to provide a hot blast furnace slag buffer storage device, docking system, and method of use, in order to solve the problems of long slag turning time, serious slag adhesion in chutes, and large temperature loss in the existing hot blast furnace slag feeding method, significantly improve the operating rate of the main electric furnace and the hot slag feeding temperature, reduce the energy consumption for the recovery and utilization of valuable elements in metallurgical solid waste, and support the sustainable development of recycling.

[0006] According to the present invention, a hot blast furnace slag buffer storage device is provided, the device comprising: The furnace body has a slag inlet at the upper end and a slag outlet at the lower end; A furnace cover, which is rotatably connected to the furnace body and capable of sealing the slag inlet, is equipped with a heating device; A slag discharge mechanism includes a refractory plug and a refractory plug opening assembly, wherein the refractory plug closes the slag outlet and the refractory plug opening assembly is controlled to break the refractory plug and open the slag outlet; A drive mechanism that supports the furnace body from below and is capable of driving the furnace body to move and / or tilt.

[0007] According to one embodiment of the present invention, the slag outlet is provided with a vertical channel, the bottom of the furnace body is conical or tapered, the vertical channel is located at the lowest point of the bottom geometry of the furnace body, the vertical channel penetrates the refractory material layer at the bottom of the furnace body, the lining of the vertical channel is aluminum-magnesium-titanium or magnesium-carbon refractory material, and the refractory plug is located in the upper section of the vertical channel.

[0008] According to one embodiment of the present invention, the fire plug is made of a high-alumina or corundum refractory material as the matrix, and 0-5% of wood chips and / or charcoal powder are added to the matrix, and then mixed and sintered.

[0009] According to one embodiment of the present invention, the fire-resistant plug opening assembly includes: A screw-on mechanical cover, switchable between a closed position and an open position, wherein in the closed position the screw-on mechanical cover closes the bottom end of the vertical channel, and in the open position the screw-on mechanical cover is located outside the furnace body; and A lifting component located on the rotating mechanical cover and capable of being raised and lowered.

[0010] According to one embodiment of the present invention, the lifting component is a hydraulic jacking assembly, wherein the jacking rod of the hydraulic jacking assembly is capable of moving directly below the fireproof plug and piercing the fireproof plug upwards.

[0011] According to one embodiment of the present invention, the interior of the screw-on mechanical cover is provided with a water-cooled cavity to allow cooling water to be introduced to protect the screw-on mechanical cover and the lifting component.

[0012] According to one embodiment of the present invention, the heating device is an electrode system.

[0013] According to one embodiment of the present invention, the drive mechanism includes a track, a traveling mechanism, a hydraulic tilting cylinder, and a positioning and locking device.

[0014] According to another aspect of the present invention, a hot blast furnace slag docking system is provided, the system comprising: The hot blast furnace slag buffer storage device according to any of the above embodiments; and The slag receiving component is shaped like a trumpet or a funnel with a larger top and a smaller bottom. When in use, the slag receiving component is installed on the side wall of the main electric furnace body and can communicate with the inner cavity of the main electric furnace.

[0015] According to another aspect of the present invention, a method of using a hot blast furnace slag buffer storage device is provided, the method using the hot blast furnace slag buffer storage device according to any of the above embodiments and comprising the following steps: The hot blast furnace slag is poured from the slag pot into the hot blast furnace slag buffer storage device, the furnace cover is closed, and the heating device is started to heat and keep the slag at 1300~1550℃. After the main electric furnace completes the previous furnace smelting, the drive mechanism is started to move the hot blast furnace slag buffer storage device to the side of the main electric furnace so that the slag outlet is connected to the slag receiving component. The refractory plug opening assembly is activated to destroy the refractory plug and open the slag outlet; Hot slag falls vertically under the action of gravity and flows into the main electric furnace molten pool through the slag receiving component; After the slag is added, the slag inlet of the slag receiving component is sealed by the side wall sealing mechanism of the main electric furnace, the refractory plug opening component is closed, the hot blast furnace slag buffer storage device is moved back to its original position, the refractory plug is reinstalled, and the furnace is ready for the next round of slag.

[0016] This invention combines the heating and insulation function of a hot blast furnace slag buffer storage device, the bottom vertical slag discharge mechanism, and the slag receiving port on the side wall of the main electric furnace. It also employs a mechanically piloted opening structure (a destructible refractory plug combined with a hydraulic jack) specifically designed for low-density molten slag, achieving the following synergistic technical effects: First, the chute was completely eliminated, and the furnace was directly connected to the furnace, thus eliminating the problem of slag adhesion in the chute from the root. Secondly, it significantly improves efficiency, reducing the hot slag transfer time from an average of nearly 60 minutes to 5-8 minutes, and increasing the main electric furnace operating rate by about 23%. Third, it effectively retains sensible heat, and rapid transfer and heating compensation increase the furnace temperature by more than 100°C, while reducing the main electric furnace power consumption by 15-20%. Fourth, it reduces labor intensity by eliminating manual cleaning of chute operations and improves safety. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a hot blast furnace slag buffer storage device according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of the structure of a fire-resistant plug opening assembly according to an embodiment of the present invention is shown; Figure 3 A flowchart illustrating the method of using the hot blast furnace slag buffer storage device according to an embodiment of the present invention is shown.

[0019] List of reference numerals in the attached diagram: 100-Furnace body; 110-Slag inlet; 120-Slag outlet; 200-Furnace cover; 210-Heating device; 300-Slag discharge mechanism; 310-Refractory plug; 320-Refractory plug opening assembly; 321-Swivel mechanical cover plate; 321a-Locking pin; 322-Lifting component; 323-Operating lever; 324-Turntable; 325-First horizontal bar; 326-Second horizontal bar; 327-Vertical bar; 328-Horizontal tilting hinge; 400-Drive mechanism; 10-Slag pot; 20-Main electric furnace; 30-Slag receiving component. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] The terms "comprising" and "having," and any variations thereof, used in the specification and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.

[0022] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] One aspect of the present invention provides a hot blast furnace slag buffer storage device. Figure 1 A schematic diagram of the overall structure of a hot blast furnace slag buffer storage device according to an embodiment of the present invention is shown. As shown in the figure, the hot blast furnace slag buffer storage device mainly includes a furnace body 100, a furnace cover 200, a slag discharge mechanism 300, and a drive mechanism 400.

[0024] The furnace body 100 has a slag inlet 110 at the upper end and a slag outlet 120 at the lower end.

[0025] The furnace cover 200 is rotatably connected to the furnace body 100 and can seal the slag inlet 110. A heating device 210 is provided on the furnace cover 200.

[0026] The slag discharge mechanism 300 includes a refractory plug 310 and a refractory plug opening component 320. The refractory plug 310 closes the slag outlet 120, and the refractory plug opening component 320 is controlled to break the refractory plug 310 and open the slag outlet 120.

[0027] The drive mechanism 400 supports the furnace body 100 from below and is capable of driving the furnace body 100 to move and / or tilt.

[0028] The components are described in detail below by way of example.

[0029] The furnace body 100 is the main structure of the device, responsible for the temporary containment and insulation of hot blast furnace slag. Its structural design directly affects storage efficiency and operational safety. The furnace body 100 can be a vertical cylindrical shape, with a slag inlet 110 at the top for receiving hot slag and a slag outlet 120 at the bottom for quantitative discharge of slag. The bottom of the furnace body 100 can be conical or tapered to ensure that the slag can collect towards the outlet under its own weight, preventing slag residue and accumulation inside the furnace.

[0030] Since the tapping temperature of blast furnace slag is between 1400 and 1650℃, which is higher than the melting temperature of iron, if an iron furnace body is used as the container for transporting blast furnace slag, the slag temperature may exceed the melting temperature of iron, and the iron furnace body structure is easily eroded and damaged by the high-temperature molten slag. Furthermore, after heat loss, the blast furnace slag easily solidifies and agglomerates, causing difficulties in unloading and even blockages, severely affecting the storage and transportation efficiency of hot slag. To alleviate these problems, the furnace body 100 can be composed of an external steel frame and an internal refractory material layer. The steel frame provides mechanical support, while the refractory material layer reduces heat loss from the high-temperature slag, preventing the slag from becoming more viscous due to heat dissipation, which would hinder slag discharge. Specifically, the internal refractory material layer can be made of alumina-magnesium-titanium or magnesia-carbon refractories to provide excellent high-temperature erosion resistance, allowing it to withstand long-term erosion by hot slag at temperatures above 1500℃.

[0031] A vertical channel can be installed at the slag outlet 120. This channel is located at the lowest point of the furnace body's geometry, penetrating the refractory material layer at the bottom of the furnace body to ensure complete slag discharge. The lining of the vertical channel can be made of aluminum-magnesium-titanium or magnesia-carbon refractory materials, possessing excellent high-temperature erosion resistance and able to withstand long-term erosion from hot slag above 1500℃. The upper section of the vertical channel is used to house the refractory plug 310, achieving a seal at the slag outlet 120, while the lower section is connected to the slag discharge mechanism 300.

[0032] The furnace cover 200 is a sealing component at the upper end of the furnace body 100, and also has an auxiliary heating function to ensure the temperature stability of the hot blast furnace slag inside the furnace. The furnace cover 200 is connected to the upper edge of the furnace body 100 via a rotating hinge structure, and can rotate around the hinge point to open and close the slag inlet 110. The size of the furnace cover 200 is perfectly matched with the slag inlet 110, and when closed, it can achieve a seal at the upper end of the furnace body, reducing heat loss from the furnace. The surface of the furnace cover 200 integrates a heating device, which can be an electric heating device, such as, but not limited to, an electrode system, and the heating power can be adjusted in real time according to the furnace temperature. When receiving blast furnace slag, the furnace cover 200 rotates open to ensure that the slag enters the furnace body smoothly. After slag discharge, the furnace cover 200 closes and seals the furnace body 100, forming a closed, insulated space with the refractory material layer of the furnace body. When the slag temperature inside the furnace is lower than a preset value, the heating device 210 automatically starts to supplement heat into the furnace, maintain the molten state of the slag, and prevent the slag from cooling and solidifying, which would lead to poor slag discharge. In addition, the sealing design of the furnace cover 200 can prevent cold air from entering the furnace and avoid slag from clumping due to rapid cooling.

[0033] The slag discharge mechanism 300 is responsible for the sealing and opening control of the slag outlet 120, realizing the quantitative and controllable discharge of hot blast furnace slag. The slag discharge mechanism 300 mainly consists of two parts: a refractory plug 310 and a refractory plug opening assembly 320. The refractory plug 310 can be placed in the upper section of the vertical channel of the slag outlet 120, directly contacting the hot slag to achieve the primary sealing of the slag outlet 120. The refractory plug opening assembly 320 is installed in the lower section of the vertical channel to achieve the secondary sealing and opening control of the slag outlet 120.

[0034] In some embodiments of the present invention, the refractory plug 310 uses a high-alumina (aluminosilicate refractory material with Al2O3 content greater than 48%) or corundum refractory material as the matrix. Depending on the application requirements, 0-5% sawdust and / or charcoal powder, accounting for the total weight of the matrix, can be added, and the mixture is then sintered. The purpose of adding sawdust and charcoal powder is to form a porous structure at high temperatures, reducing the strength of the refractory plug and facilitating subsequent destruction of the opening components. The dimensions of the refractory plug perfectly match the upper section of the vertical channel, achieving a seal through its own weight and slag pressure, without the need for additional fixing structures.

[0035] In some embodiments of the present invention, such as Figure 2 As shown, the refractory plug opening assembly 320 may include a screw-on mechanical cover 321 and a lifting component 322. The screw-on mechanical cover 321 can be connected to the bottom of the furnace body via a connecting rod. Multiple radially protruding locking pins 321a are evenly distributed circumferentially along the upper surface edge of the screw-on mechanical cover 321. An "L"-shaped groove is correspondingly provided on the inner wall of the slag outlet 120. The "L"-shaped groove can be composed of a vertical guide groove and a horizontal locking groove, forming a shape-fitting locking mechanism. A vertical operating rod 323 is fixedly connected to the lower center of the screw-on mechanical cover 321. A turntable 324 for controlling the rotation of the operating rod 323 is provided below it. The turntable 324 can be driven by a motor mounted on a support frame to rotate in the horizontal plane. The support frame is connected to the bottom outer wall of the furnace body 100. The operating rod 323 can adopt an inner and outer sleeve structure, with a built-in hydraulic cylinder for axial extension and retraction. Meanwhile, the support frame may include a first horizontal bar 325 connected to the turntable, a second horizontal bar 326 located above the first horizontal bar and connected to the furnace body 100, and a vertical bar 327 connecting the first horizontal bar 325 and the second horizontal bar 326. A horizontal flipping hinge 328 is also provided between the lower end of the vertical bar 327 and the first horizontal bar 325, so that the turntable and the rotating mechanical cover 321 can be flipped downward around the lower end of the vertical bar. The lifting component 322 is centrally positioned on the upper surface of the rotating mechanical cover 321. The lifting component 322 may be a hydraulic jacking assembly, which includes a hydraulic cylinder and a jacking rod. The jacking rod can be raised and lowered under the drive of the hydraulic cylinder, thereby breaking the refractory plug 310 from directly below it.

[0036] The refractory plug opening assembly 320 is used as follows: When slag is not being discharged, the screw-on mechanical cover 321 is pressed into the slag outlet 120, with its locking pin located at the end of the locking groove of the L-shaped slot. The shape fit securely locks it in place, preventing accidental opening. When slag discharge is required, the motor drives the turntable to rotate counterclockwise by a preset angle (e.g., 30°) in the horizontal plane, causing the operating lever 323 and the screw-on mechanical cover 321 to rotate synchronously. This causes the locking pin 321a to slide out along the locking groove to the top of the vertical guide groove, releasing the shape fit lock. At this point, the screw-on mechanical cover 321 can only move axially. Subsequently, the hydraulic cylinder built into the operating lever 323 is activated, causing the operating lever 323 to retract downwards, driving the screw-on mechanical cover 321 to descend vertically as a whole. This completely disengages the locking pin from the L-shaped slot and separates the upper surface of the screw-on mechanical cover 321 from the lower end of the slag outlet 120. After the rotary mechanical cover 321 descends to the preset height, the lifting component 322's push rod rises until it breaks through the refractory plug 310. Then, the horizontal tilting hinge 328 is driven, causing the first horizontal rod 325, along with the turntable 324 and the rotary mechanical cover 321, to rotate 90° downwards around the lower end of the vertical rod to a lateral position, thus completely clearing the slag discharge space directly below the slag outlet 120, ensuring the molten slag can fall without obstruction. After slag discharge is completed, the components operate in reverse order: first, they tilt upwards to reset, then rise back to their original position, and finally rotate horizontally in the opposite direction to the end of the locking groove, reforming their shape for locking.

[0037] In some embodiments of the present invention, the interior of the screw-on mechanical cover 321 may also be provided with a water-cooled cavity to allow cooling water to be introduced to cool the screw-on mechanical cover 321 and the lifting component 322, thereby protecting these components.

[0038] In this embodiment of the invention, the refractory plug 310 and the opening component 320 work together to achieve a double seal of the slag outlet 120, ensuring that there is no slag leakage during the transportation of the furnace body 100; according to the needs of subsequent processes, the timing of the failure and the degree of opening of the refractory plug 310 can be precisely controlled to achieve controlled discharge of slag and improve the stability and controllability of the entire metallurgical process.

[0039] The drive mechanism 400 supports the furnace body 100 from below and can drive the furnace body 100 to move and / or tilt, thereby improving the operational flexibility and adaptability of the device.

[0040] The drive mechanism 400 mainly consists of a track, a traveling mechanism, a hydraulic tilting cylinder, and a positioning and locking device. The bottom of the furnace body can be connected to the support platform via a track, providing stable support for the furnace body. The traveling mechanism adopts a track-type or tire-type design, enabling horizontal relative movement between the support platform and the furnace body 100. The hydraulic tilting cylinder is driven by a hydraulic cylinder, allowing the furnace body 100 to tilt around a tilting axis at a certain angle. The positioning and locking device ensures that the furnace body is securely locked after horizontal movement or tilting to the required angle, preventing accidental displacement due to external impact, hydraulic fluctuations, or changes in the furnace body's own weight, thus ensuring the stability and safety of slag discharge and tilting operations. The horizontal movement function allows the device to move horizontally, aligning with the slag inlet of the main electric furnace. The tilting function allows residual slag to converge towards the outlet direction by tilting the furnace body 100 during the later stages of slag discharge, ensuring complete slag discharge and reducing residue inside the furnace. Furthermore, the drive mechanism 400 can adjust the furnace body position according to the available space, improving the device's site adaptability.

[0041] According to another aspect of the present invention, a hot blast furnace slag docking system is provided, such as... Figure 1 As shown, the system includes a hot blast furnace slag buffer storage device according to the above embodiment; and a slag receiving component 30. The slag receiving component 30 is funnel-shaped or larger at the top and smaller at the bottom. When in use, the slag receiving component 30 is disposed on the side wall of the main electric furnace 20 and can communicate with the inner cavity of the main electric furnace 30.

[0042] According to another aspect of the present invention, a method of using a hot blast furnace slag buffer storage device is provided, the method using the hot blast furnace slag buffer storage device according to the above embodiments. Figure 3 As shown, the method includes the following steps: Step S1: Pour the hot blast furnace slag from the slag pot 10 into the hot blast furnace slag buffer storage device, cover the furnace cover 200, and start the heating device 210 to heat and keep the slag at 1300~1550℃. Step S2: After the main electric furnace completes the previous furnace smelting, start the drive mechanism 400 to move the hot blast furnace slag buffer storage device to the side of the main electric furnace, so that the slag outlet 120 and the slag receiving component 30 are connected. Step S3: Activate the refractory plug opening component 320 to destroy the refractory plug 310 and open the slag outlet 120; Step S4: The hot slag falls vertically under the action of gravity and flows into the main electric furnace molten pool through the slag receiving component 30; Step S5: After the slag addition is completed, the slag inlet of the slag receiving component 30 is sealed by the side wall sealing mechanism of the main electric furnace, the refractory plug opening component 320 is closed, the hot blast furnace slag buffer storage device is moved back to its original position, the refractory plug 310 is reinstalled, and the next round of slag is awaited.

[0043] Application examples A factory has a 31.5 MVA main electric arc furnace used to process blast furnace slag and recover valuable metals from it. A buffer storage unit is installed next to the main furnace. The buffer storage unit has a slag discharge mechanism at the bottom of the furnace body; the vertical slag discharge channel is lined with aluminum-magnesium-titanium refractory material, and the channel diameter is 150 mm. The destructible refractory plug is made of corundum material with 2 wt% sawdust added and sintered. The rotary mechanical cover is hydraulically driven, and the cover has a water-cooled cavity. The front end of the hydraulic jack assembly is made of heat-resistant steel, and the jack has a water-cooled channel inside.

[0044] The buffer storage device is equipped with a movable and / or tilting mechanism at the bottom to support and drive the buffer storage device to move horizontally and tilt; the hydraulic tilting cylinder can tilt the buffer storage device towards the main electric furnace side by 0~25°.

[0045] Operating procedures: S1: Pour the hot blast furnace slag directly from the slag pot into the hot blast furnace slag buffer storage device, cover the furnace cover, start the electrode system to heat and keep the slag at 1400℃. S2: After the main electric furnace completes the previous furnace smelting, start the moving and tilting mechanism to move the hot blast furnace slag buffer storage device to the side of the main electric furnace, so that the slag outlet of the vertical slag discharge channel is aligned with the outer port of the slag receiving port. S3: The screw-on mechanical cover opens, the hydraulic push rod assembly extends, and the push rod physically destroys the destructible fire plug vertically upwards; S4: High-temperature liquid slag falls vertically from the vertical slag discharge channel under the action of gravity and flows into the main electric furnace molten pool through the slag receiving port on the side wall. S5: After the slag is added, the slag inlet is sealed by the side wall sealing mechanism of the main electric furnace. Then, the screw-on mechanical cover is closed, the hot blast furnace slag buffer storage device is moved back to its original position, a new destructible refractory plug is reinstalled, and after being compacted, it waits for the next round of slag.

[0046] During the slag addition process, the electrode system of the main electric furnace can be stopped or kept in operation.

[0047] Comparison of effects: Compared with the original hot slag charging and smelting mode, the beneficial effects of adopting this application example are as follows: (1) Hot slag charging time: originally 40~70 minutes / furnace, in this application example 5~8 minutes / furnace; (2) Slag removal time in the chute: Originally, each furnace required 3 to 4 people and 2 hours to manually remove slag. In this application example, there is no slag sticking, which saves manpower and resources. (3) Main furnace production efficiency: The production time per furnace is shortened by 45-60 minutes, and the production efficiency is increased by 23%; (4) Electricity consumption per ton of slag: Due to the shorter waiting time of the main furnace, it is basically in a continuous smelting state, the temperature drop of the electric furnace is lower, and the electricity consumption per ton of slag is reduced by 18.4%.

[0048] Beneficial effects of the invention The above application examples demonstrate that by combining the heating and insulation function of the hot blast furnace slag buffer storage device, the bottom vertical slag discharge mechanism, and the slag receiving port on the side wall of the main electric furnace, and employing a mechanically piloted opening structure (a destructible refractory plug combined with a hydraulic jack) specifically designed for low-density molten slag, the present invention achieves the following synergistic technical effects: First, the chute was completely eliminated, and the furnace was directly connected to the furnace, thus eliminating the problem of slag adhesion in the chute from the root. Secondly, it significantly improves efficiency, reducing the hot slag transfer time from an average of nearly 60 minutes to 5-8 minutes, and increasing the main electric furnace operating rate by about 23%. Third, it effectively retains sensible heat, and rapid transfer and heating compensation increase the furnace temperature by more than 100°C, reducing the main electric furnace power consumption by 15-20%. Fourth, it reduces labor intensity by eliminating manual cleaning of chute operations and improves safety.

[0049] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the disclosed embodiments. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. The sequence numbers of the disclosed embodiments of this invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0050] It should be understood that, as used herein, the singular form “a” is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, “and / or” refers to any and all possible combinations of one or more of the associated listed items.

[0051] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of the present invention is limited to these examples. Within the framework of the present invention, technical features of the above embodiments or different embodiments can also be combined, and many other variations of different aspects of the present invention as described above exist, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hot state blast furnace slag buffer storage device, characterized by, include: The furnace body (100) has a slag inlet (110) at its upper end and a slag outlet (120) at its lower end. A furnace cover (200) is rotatably connected to the furnace body (100) and capable of sealing the slag inlet (110). A heating device (210) is provided on the furnace cover (200). The slag discharge mechanism (300) includes a refractory plug (310) and a refractory plug opening assembly (320), wherein the refractory plug (310) closes the slag outlet (120) and the refractory plug opening assembly (320) is controlled to break the refractory plug (310) and open the slag outlet (120). A drive mechanism (400) that carries the furnace body (100) from below and is capable of driving the furnace body (100) to move and / or tilt.

2. The hot blast furnace slag buffer storage device according to claim 1, characterized in that, The slag outlet (120) is provided with a vertical channel. The bottom of the furnace body (100) is conical or tapered. The vertical channel is located at the lowest point of the bottom geometry of the furnace body (100). The vertical channel penetrates the refractory material layer at the bottom of the furnace body (100). The lining of the vertical channel is made of aluminum-magnesium-titanium or magnesium-carbon refractory material. The refractory plug (310) is located in the upper section of the vertical channel.

3. The hot blast furnace slag buffer storage device according to claim 1, characterized in that, The fire plug (310) is made of high-alumina or corundum refractory material as the matrix, and wood chips and / or charcoal powder accounting for 0-5% of the total weight of the matrix are added, and then mixed and sintered.

4. The hot blast furnace slag buffer storage device according to claim 2, characterized in that, The fire plug opening assembly (320) includes: A screw-on mechanical cover (321) capable of switching between a closed position and an open position; in the closed position, the screw-on mechanical cover (321) closes the bottom end of the vertical channel; in the open position, the screw-on mechanical cover (321) is located outside the furnace body; and A lifting component (322) located on the rotating mechanical cover (321) and capable of being raised and lowered.

5. The hot blast furnace slag buffer storage device according to claim 4, characterized in that, The lifting component (322) is a hydraulic jacking assembly, and the jacking rod of the hydraulic jacking assembly can move to directly below the fire plug (310) and push upward to break through the fire plug (310).

6. The hot blast furnace slag buffer storage device according to claim 4, characterized in that, The inside of the screw-on mechanical cover (321) is provided with a water-cooled cavity to allow cooling water to flow in and protect the screw-on mechanical cover (321) and the lifting component (322).

7. The hot blast furnace slag buffer storage device according to claim 1, characterized in that, The heating device (210) is an electrode system.

8. The hot blast furnace slag buffer storage device according to claim 1, characterized in that, The drive mechanism (400) includes a track, a traveling mechanism, a hydraulic tilting cylinder, and a positioning and locking device.

9. A hot blast furnace slag docking system, characterized in that, include: Hot blast furnace slag buffer storage device according to any one of claims 1-8; as well as The slag receiving component (30) is in the shape of a trumpet or a funnel with a larger top and a smaller bottom. When in use, the slag receiving component (30) is set on the side wall of the main electric furnace (20) and can communicate with the inner cavity of the main electric furnace (30).

10. A method of using a hot blast furnace slag buffer storage device, characterized in that, The method uses a hot blast furnace slag buffer storage device according to any one of claims 1-8 and includes the following steps: Hot blast furnace slag is poured from slag pot (10) into hot blast furnace slag buffer storage device, furnace cover (200) is closed, heating device (210) is started to heat and keep the slag at 1300~1550℃. After the main electric furnace completes the previous furnace smelting, the drive mechanism (400) is started to move the hot blast furnace slag buffer storage device to the side of the main electric furnace, so that the slag outlet (120) is connected to the slag receiving component (30); The refractory plug opening assembly (320) is activated to break the refractory plug (310) and open the slag outlet (120). Hot slag falls vertically under the action of gravity and flows into the main electric furnace molten pool through the slag receiving component (30); After the slag is added, the slag inlet of the slag receiving component (30) is sealed by the side wall sealing mechanism of the main electric furnace, the refractory plug opening component (320) is closed, the hot blast furnace slag buffer storage device is moved back to its original position, the refractory plug (310) is reinstalled, and the next round of slag is awaited.

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