Blast furnace molten iron desilicication device
By setting up a desilication agent unit and a stirring unit in the desilication section of the molten iron trough, the uniform mixing of molten iron and desilication agent is achieved by using the rotation and oscillation of the stirring head. This solves the problem of the intense and difficult-to-control desilication reaction in the existing technology, improves desilication efficiency and production efficiency, and reduces energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-02
- Publication Date
- 2026-03-20
AI Technical Summary
The existing hot metal pre-desiliconization technology reacts too violently during tapping, which is difficult to control. This leads to increased slag volume, accelerated erosion of furnace lining materials, increased iron shrinkage rate, and increased smelting costs. Furthermore, the desiliconized slag is difficult to remove, which affects the conversion of iron.
A desiliconizing agent unit and a stirring unit are set up in the desiliconization section of the molten iron trough. By spraying the desiliconizing agent and using the rotation and reciprocating oscillation of the stirring head, the molten iron and the desiliconizing agent are mixed evenly, the flow rate and residence time of the molten iron are controlled, and the desiliconization efficiency is improved.
This technology enables efficient desiliconization within molten iron troughs, reducing the burden on subsequent processes, increasing production efficiency, reducing energy consumption, and ensuring the uniformity and thoroughness of the desiliconization process.
Smart Images
Figure CN224015704U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of steel smelting technology, especially relates to a blast furnace molten iron desilication device. BACKGROUND
[0002] In the steelmaking process, silicon in molten iron has both importance and two-sidedness. On the one hand, it is an indispensable key element for steelmaking and an important slag forming element. On the other hand, if the mass fraction of silicon in molten iron is too high, a series of problems will be caused. When the silicon content is high, a large amount of SiO2 will be generated in the steelmaking process. In order to achieve the required alkalinity for effective dephosphorization, a large amount of lime must be added. This not only leads to an increase in steelmaking slag quantity, an increase in alkaline slag forming agent unit consumption, and an acceleration of the erosion of furnace lining materials, but also causes an increase in the shrinkage rate of iron, thereby reducing the yield of steel. In addition, when the silicon content of molten iron reaches ≥0.60%, the control difficulty of the steelmaking process will be significantly increased, and splashing phenomenon is likely to occur, which also increases the consumption of slag and steel materials, increases oxygen consumption, prolongs the smelting cycle, and ultimately significantly increases the cost of steelmaking.
[0003] Traditional molten iron pre-desilication is to pre-add desiliconizing materials in the ladle before tapping, or to pre-add desiliconizing materials in the ladle when the torpedo tank is tapped in the steelmaking plant. From the reaction effect, the kinetic conditions and desiliconizing effect of the two ways are good. However, the first way has a large difference when tapping, the reaction is too violent, and the desulfurization slag foaming and splashing is difficult to control. Moreover, the working conditions are poor, and the transportation capacity of the ladle is reduced by more than 40%. The desiliconizing slag of the second way is difficult to remove, and it also affects the iron feeding of the converter. SUMMARY
[0004] The utility model provides a blast furnace molten iron desiliconizing device aiming at the defects existing in the prior art.
[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme, a blast furnace molten iron desiliconizing device, the desiliconizing device is arranged in the desiliconizing section of the molten iron channel; the desiliconizing device includes a desiliconizing agent unit above the desiliconizing section and a stirring unit arranged in the desiliconizing section; wherein the desiliconizing agent unit is used for spraying desiliconizing agent to the flowing molten iron; the stirring unit is used for stirring and mixing the molten iron and the desiliconizing agent; the stirring unit includes at least one pair of stirring heads, and the stirring heads can spin and reciprocate relative to the extension direction of the molten iron channel.
[0006] Further, the molten iron channel is divided into a molten iron channel A section for receiving the molten iron flowing out of the blast furnace, and a molten iron channel B section connected with the molten iron channel A section, which serves as the desiliconizing section; a height difference H is arranged between the molten iron inlet and the molten iron outlet of the molten iron channel B section to control the flow speed of the molten iron.
[0007] Further, the desilication agent unit comprises a desilication agent tank for storing the desilication agent, and a nozzle is arranged at the bottom of the desilication agent tank for uniformly spraying the desilication agent into the molten iron.
[0008] Further, the desilication agent tank is fixed above the desilication section by a frame body.
[0009] Further, the stirring unit further comprises a rotating driving mechanism, which comprises a gear box fixed above the desilication section by two stand columns and rotationally connected with the two stand columns through a swing shaft; a stirring motor is arranged at the top of the gear box to provide power; and a gear one and a gear two are arranged inside the gear box and meshed with each other to transmit the power to the stirring heads.
[0010] Further, the stirring unit further comprises a rotating driving mechanism, which comprises a gear box fixed above the desilication section by two stand columns and rotationally connected with the two stand columns through a swing shaft; a stirring motor is arranged at the top of the gear box to provide power; and a gear one and a gear two are arranged inside the gear box and meshed with each other to transmit the power to the stirring heads.
[0011] Further, the stirring unit further comprises a rotating driving mechanism, which comprises a gear box fixed above the desilication section by two stand columns and rotationally connected with the two stand columns through a swing shaft; a stirring motor is arranged at the top of the gear box to provide power; and a gear one and a gear two are arranged inside the gear box and meshed with each other to transmit the power to the stirring heads.
[0012] Further, the stirring unit further comprises a swing driving mechanism for driving the stirring heads to swing back and forth, which comprises a chain wheel one arranged outside the swing shaft and a chain wheel two arranged outside the motor shaft of a swing motor, and the chain wheel one and the chain wheel two are connected through a chain transmission; the swing motor is rotated to transmit swing power through the chain to make the stirring heads swing along the direction of the molten iron channel.
[0013] Further, the swing motor is fixed on the stand column through a U-shaped frame.
[0014] Further, the gear box is provided with a gear box cover for protecting the internal transmission structure.
[0015] Compared with the prior art, the desilication device has the following beneficial effects.
[0016] The desilication device can complete the desilication of the molten iron in the molten iron channel after the molten iron is discharged from the blast furnace, reduce the burden of subsequent processes, improve the production efficiency and reduce the energy consumption.
[0017] Meanwhile, the blast furnace molten iron desilication device has the stirring unit at the upper end of the stirring area, 2 stirring heads are arranged at the lower end of the stirring unit, the stirring head penetrates into the molten iron, the self-rotation of the stirring head can realize the stirring of the molten iron flowing through the stirring area, so that the molten iron and the desilication agent are fully combined, and the desilication efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS
[0018] The utility model makes further explanation in combination with the drawings and specific embodiment. The utility model protection scope is not only limited to the following content's expression.
[0019] Figure 1 It is a kind of blast furnace molten iron desilication device front view.
[0020] Figure 2 It is a kind of blast furnace molten iron desilication device three-dimensional view Figure 1 .
[0021] Figure 3 It is a kind of blast furnace molten iron desilication device three-dimensional view Figure 2 .
[0022] Figure 4 It is a kind of blast furnace molten iron desilication device side view.
[0023] Figure 5 It is a kind of blast furnace molten iron desilication device gear box sectional view.
[0024] Figure 6 It is a kind of blast furnace molten iron desilication device molten iron stirring flow schematic view.
[0025] Figure 7 It is a kind of blast furnace molten iron desilication device stirring head swing schematic view.
[0026] In the drawing, 1, molten iron ditch A section;2, desilication agent unit;3, stirring unit;4, molten iron ditch B section;5, blast furnace;201, desilication agent tank;202, nozzle;301, stand;302, swing shaft;303, gear box;304, gear box cover;305, stirring motor;306, chain wheel one;307, chain;308, swing motor;309, U-shaped frame;310, stirring head one;311, stirring head two;312, transmission shaft one;313, gear one;314, gear two;315, coupling;316, pin;317, chain wheel two;401, molten iron inlet;402, stirring area;403, molten iron outlet. DETAILED DESCRIPTION
[0027] To make the objectives, technical solutions, and beneficial effects of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.
[0028] like Figures 1-7 As shown, a blast furnace molten iron desilication device is installed in the desilication section of the molten iron trough. The molten iron trough is divided into molten iron trough section A 1 for receiving molten iron flowing from the blast furnace and molten iron trough section B 4 connected to molten iron trough section A 1, which serves as the desilication section. A height difference H is provided between the molten iron inlet 401 and the molten iron outlet 403 of molten iron trough section B 4 to control the flow rate of the molten iron. The height difference H between the molten iron inlet 401 and the outlet 403 of molten iron trough section B 4 can precisely control the flow rate of the molten iron. This design optimizes the residence time of molten iron in the desilication section, ensuring that the desilication agent and the molten iron have sufficient time to react chemically, thereby improving the desilication efficiency.
[0029] The desilication device includes a desilication agent unit 2 located above the desilication section and a stirring unit 3 disposed within the desilication section. The desilication agent unit 2 sprays the desilication agent into the flowing molten iron, ensuring uniform distribution of the desilication agent throughout the molten iron flow. The stirring unit 3 mixes the molten iron and the desilication agent; it includes at least one pair of stirring heads capable of spinning and reciprocating relative to the direction of the molten iron channel. This stirring method not only increases the contact area between the molten iron and the desilication agent but also helps break up any uneven areas that may form, resulting in a more uniform and thorough desilication process.
[0030] In other words, the blast furnace hot metal desiliconization device includes a section B of hot metal trough for desiliconization. The inlet and outlet of section B have a height difference to ensure the flow rate of the hot metal. Furthermore, a stirring zone is located in the middle of section B to fully agitate the hot metal containing the desiliconizing agent, thus achieving complete desiliconization of the hot metal.
[0031] Preferably, the desiliconizing agent unit 2 includes a desiliconizing agent tank 201 for storing the desiliconizing agent, and the desiliconizing agent tank 201 is fixed above the desiliconizing section by a frame. A nozzle 202, specifically a high-pressure nozzle, is provided at the bottom of the desiliconizing agent tank 201 for uniformly spraying the desiliconizing agent into the molten iron.
[0032] Preferably, the stirring unit 3 further comprises a rotating driving mechanism, which comprises a gear box 303 fixed above the desiliconization section through two upright columns 301, and the gear box 303 is rotationally connected with the two upright columns 301 through a swing shaft 302; the upright column 301 provides a stable base support, ensuring the stability and reliability of the stirring unit during operation. In addition, this structure can effectively reduce vibration and noise.
[0033] A stirring motor 305 is installed on the top of the gear box 303 to provide power, and the gear box 303 is internally provided with gear one 313 and gear two 314 which are in mesh with each other, for transmitting power to the stirring heads. When the gear one 313 rotates, the gear two 314 is driven to rotate through the contact force between the gears.
[0034] The stirring heads include two: stirring head one 310 and stirring head two 311. The stirring motor 305 is connected with a transmission shaft one 312 through a shaft coupling 315, the gear one 313 is sleeved on the transmission shaft one 312, and one end of the transmission shaft one 312 extending out of the gear box 303 is connected with the stirring head two 311; the gear two 314 is sleeved on a transmission shaft two, and one end of the transmission shaft two extending out of the gear box 303 is installed with the stirring head one 310. The stirring motor 305 is used to drive the transmission shaft one 312 to rotate, and the transmission shaft two is driven to rotate through gear meshing. The stirring heads are connected with the corresponding transmission shafts through respective pins 316, and can self-rotate under the driving of the gear box 303. This connection mode not only ensures that the stirring heads can rotate synchronously with the transmission shafts, but also facilitates disassembly and replacement, thereby increasing the convenience of equipment maintenance.
[0035] Preferably, the stirring unit 3 further comprises a swing driving mechanism for driving the stirring heads to swing back and forth, which comprises a chain wheel one 306 installed outside the swing shaft 302 and a chain wheel two 317 installed outside the motor shaft of a swing motor 308, and the chain wheel one 306 and the chain wheel two 317 are transmissionally connected through a chain 307; the swing motor 308 is fixed on the upright column 301 through a U-shaped bracket 309. The swing motor 308 rotates, and swing power is transmitted through the chain 307 to make the stirring heads swing along the direction of the runner. The gear box 303 is provided with a gear box cover 304 for protecting the internal transmission structure. Specifically, the swing motor 308 is connected with the chain wheel one 306 installed on the swing shaft 302 through the chain wheel two 317 on the motor shaft thereof and the chain 307. When the swing motor 308 rotates, power is transmitted to the chain wheel one 306 through the chain 307, thereby driving the swing shaft 302 to rotate.
[0036] Preferably, the stirring head one and the stirring head two are both provided with stirring blades for facilitating stirring.
[0037] The use process of the utility model is described in combination with the drawings and technical solutions:
[0038] First from the blast furnace flows through the iron channel A section, to the iron channel B section.
[0039] The desiliconizing agent unit is arranged above the molten iron inlet of the iron channel B section, and after the molten iron arrives, the desiliconizing agent unit starts to work and sprays the desiliconizing agent into the flowing molten iron from the nozzle.
[0040] The molten iron with the desiliconizing agent flows to the stirring area 402, at this time, the stirring unit 3 is started, the stirring head of the stirring unit 3 is submerged in the molten iron, the stirring fan blades are arranged on the stirring head, the stirring motor is started, the transmission shaft is driven to rotate through the coupling, the gear is arranged on the transmission shaft, the gear one and the gear two are meshed with each other to drive the stirring head one and the stirring head two to rotate, the molten iron flowing through is stirred through the fan blades on the stirring head, and the molten iron and the desiliconizing agent are fully combined.
[0041] When the stirring head rotates by itself, the swing motor can be started, the swing shaft is driven to swing along the shaft center through the sprocket and the chain (the swing amplitude can be controlled by the motor), so that the stirring head swings by a certain angle along the direction of the iron channel (it can also be unidirectional) while rotating by itself. The combination of the two movements of the stirring head is more beneficial to the combination of the molten iron and the desiliconizing agent.
[0042] The stirring head is made of high-temperature-resistant material and is connected with the respective transmission shaft through the pin, so that the stirring head is convenient to replace.
[0043] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "preferred embodiment", "specific implementation", or "preferred implementation" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0044] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; thus, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope defined by the claims of the present application.
Claims
1. A desiliconization device for blast furnace molten iron, wherein the desiliconization device is located in the desiliconization section of the molten iron trough; characterized in that, The desiliconization device includes a desiliconizing agent unit (2) located above the desiliconization section and a stirring unit (3) located in the desiliconization section; wherein, the desiliconizing agent unit (2) is used to spray desiliconizing agent into the flowing molten iron; the stirring unit (3) is used to stir and mix the molten iron and the desiliconizing agent; the stirring unit (3) includes at least one pair of stirring heads, which are capable of spinning and reciprocating relative to the extension direction of the molten iron channel.
2. The blast furnace hot metal desiliconization device according to claim 1, characterized in that, The molten iron trough is divided into molten iron trough section A (1) for receiving molten iron flowing from the blast furnace and molten iron trough section B (4) connected to molten iron trough section A (1). Molten iron trough section B (4) serves as a desiliconization zone. A height difference H is provided between the molten iron inlet (401) and the molten iron outlet (403) of molten iron trough section B (4) to control the flow rate of molten iron.
3. The blast furnace hot metal desiliconization device according to claim 1, characterized in that, The desiliconizing agent unit (2) includes a desiliconizing agent tank (201) for storing desiliconizing agent. A nozzle (202) is provided at the bottom of the desiliconizing agent tank (201) for uniformly spraying the desiliconizing agent into the molten iron.
4. The blast furnace hot metal desiliconization device according to claim 3, characterized in that, The desilication agent tank (201) is fixed above the desilication section by a frame.
5. The blast furnace hot metal desiliconization device according to claim 1, characterized in that, The stirring unit (3) also includes a rotary drive mechanism, which includes a gearbox (303) fixed above the desiliconization section by two columns (301). The gearbox (303) is rotatably connected to the two columns (301) by a swing shaft (302). A stirring motor (305) that provides power is installed on the top of the gearbox (303). The gearbox (303) is provided with a meshing gear one (313) and a gear two (314) inside the gearbox (303) for transmitting power to the stirring head.
6. The blast furnace hot metal desiliconization device according to claim 5, characterized in that, There are two stirring heads: stirring head one (310) and stirring head two (311). The stirring motor (305) is connected to the drive shaft one (312) through the coupling (315). Gear one (313) is sleeved on the drive shaft one (312). The end of the drive shaft one (312) that extends out of the gearbox (303) is connected to stirring head two (311). Gear two (314) is sleeved on the drive shaft two. The end of the drive shaft two that extends out of the gearbox (303) is equipped with stirring head one (310).
7. The blast furnace hot metal desiliconization device according to claim 6, characterized in that, The stirring motor (305) is used to drive the first transmission shaft (312) to rotate, and drives the second transmission shaft to rotate through gear meshing. The stirring head is connected to the corresponding transmission shaft through its respective pin (316) and can spin under the drive of the gearbox (303).
8. The blast furnace hot metal desiliconization device according to claim 5, characterized in that, The stirring unit (3) also includes a swing drive mechanism for driving the stirring head to swing back and forth. The swing drive mechanism includes a sprocket one (306) mounted outside the swing shaft (302) and a sprocket two (317) mounted outside the motor shaft of the swing motor (308). The sprocket one (306) and the sprocket two (317) are connected by a chain (307). The swing motor (308) rotates and transmits the swing power through the chain (307) to make the stirring head swing along the direction of the molten iron trough.
9. The blast furnace hot metal desiliconization device according to claim 8, characterized in that, The swing motor (308) is fixed to the column (301) by a U-shaped frame (309).
10. The blast furnace hot metal desiliconization device according to claim 1, characterized in that, The gearbox (303) is provided with a gearbox cover (304) to protect the internal transmission structure.