Tundish device and method for removing sulfur from smelted metal

Abstract

The embodiment of the invention relates to the technical field of metal smelting, and discloses a tundish device and a sulfur removal method of smelted metal, the tundish device comprises a groove body, a powder spraying pipe and a flow stabilizing piece, a powder spraying opening is formed in the side wall of the groove body, the powder spraying pipe is communicated with the powder spraying opening, and the powder spraying pipe is used for spraying a powdery medium into the groove body; the powdery medium can be combined with sulfur in molten metal to form sulfide, the flow stabilizing piece is connected with the bottom wall of the tank body, and an air spraying opening is formed in the flow stabilizing piece and used for spraying a gas medium into the tank body. A powder spraying device and an air spraying device are additionally arranged in the tundish device, metal is subjected to desulfurization treatment in the continuous casting process, sulfur inclusions in molten metal can be effectively removed in the final stage of continuous casting, the purity of the molten metal is improved, the sulfide content in a finished metal product is reduced, and the performance quality of the metal is improved. And the powder spraying technology also uniformizes the flow field in the molten metal, and improves and enhances the metallurgical reaction conditions in the molten metal.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of metal smelting, and in particular to a tundish device and a method for desulfurizing smelted metal. Background Art

[0002] Sulfur exists in metals in the form of sulfides, mainly because during the smelting process, sulfur in the molten metal reacts with other elements (such as manganese and iron) to form sulfides. Sulfides seriously affect the properties of metals, causing the toughness and ductility of metals to decrease, and affecting the quality of the metal's processed surface.

[0003] In order to control sulfur inclusions in metals, the desulfurization methods used in related technologies are: adding desulfurization elements and alloying agents in converter steelmaking, optimizing process parameters, calcium treatment and electroslag remelting technology, etc. Related technologies all perform desulfurization treatment before metal continuous casting. The molten metal will inevitably be contaminated again during the casting process, resulting in incomplete desulfurization during continuous casting, so that the sulfide content in the metal finished product is still high. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present invention provides a tundish device.

[0006] A second aspect of the present invention provides a method for removing sulfur from smelted metals.

[0007] In view of this, according to the first aspect of the technical solution of the present application, a tundish device is proposed, which includes: a trough body, a powder spraying pipe and a flow stabilizer, a powder spraying port is provided on the side wall of the trough body, the powder spraying pipe is connected to the powder spraying port, the powder spraying pipe is used to spray powdered medium into the trough body, the powdered medium can combine with sulfur in the molten metal to form sulfide, the flow stabilizer is connected to the bottom wall of the trough body, and a jet nozzle is provided on the flow stabilizer, and the jet nozzle is used to spray gaseous medium into the trough body.

[0008] In some technical solutions provided in the present application, optionally, the tundish device further includes a liquid inlet pipe, a long water inlet is provided at the end of the liquid inlet pipe, a flow stabilizer is arranged opposite to the long water inlet, and the jet port is located at the top of the flow stabilizer.

[0009] In some technical solutions provided in the present application, optionally, a groove is provided on the top of the flow stabilizer, and the air jet is provided on the bottom wall of the groove.

[0010] In some technical solutions provided in the present application, optionally, a guide groove is provided on the bottom wall of the groove, and there are multiple air jets, which are spaced apart and distributed at the bottom of the guide groove along the direction in which the guide groove extends.

[0011] In some technical solutions provided in the present application, optionally, there are multiple guide grooves, and the arrangement direction of the multiple guide grooves is different from the extension direction of the guide grooves.

[0012] In some technical solutions provided in the present application, optionally, the guide groove is a V-shaped groove or a U-shaped groove.

[0013] In some technical solutions provided in the present application, optionally, the powder spraying pipe includes a nozzle, the nozzle is connected to the powder spraying port, and the nozzle is a Venturi tube.

[0014] In some technical solutions provided in the present application, optionally, the tundish device further includes a support member, which is respectively connected to the flow stabilizing member and the bottom wall of the trough body.

[0015] The second technical solution of the present application provides a method for desulfurizing smelted metal, using a tundish device provided by any of the above-mentioned first technical solutions, the method for desulfurizing smelted metal includes: spraying a gaseous medium into a tank body through a jet nozzle; injecting molten metal into the tank body; spraying a powdered medium into the tank body through a powder spray pipe, so that the powdered medium combines with sulfur in the molten metal to form sulfides, and the sulfides float to the metal slag layer of the molten metal under the drive of the gaseous medium.

[0016] In some technical solutions provided in the present application, optionally, before the step of spraying the powdered medium into the tank body with a powder spraying tube, the step further includes: adding silicone oil to the powdered medium.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: By adding powder spraying and air jetting devices to the tundish device, the metal is desulfurized during the continuous casting process. The sulfur inclusions in the molten metal can be effectively removed in the final stage of continuous casting, which improves the purity of the molten metal, reduces the sulfide content in the finished metal product, and improves the performance quality of the metal. In addition, the powder spraying technology also evens out the flow field in the molten metal, improves and enhances the metallurgical reaction conditions in the molten metal, and lays the foundation for improving the quality of continuous casting metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A schematic diagram of the structure of a tundish device according to an embodiment of the present application; Figure 2 A schematic diagram of the structure of a flow stabilizing member according to an embodiment of the present application; Figure 3A schematic diagram of the structure of a nozzle according to an embodiment of the present application; Figure 4 A schematic flow chart of a method for desulfurization of smelting metals according to an embodiment of the present application.

[0019] in, Figures 1 to 4 The corresponding relationship between the reference numerals and the component names is as follows: 10 tundish device, 100 tank body, 110 powder spray port, 120 immersed nozzle, 200 powder spray pipe, 210 nozzle, 300 flow stabilizer, 310 jet nozzle, 320 groove, 321 guide groove, 400 liquid inlet pipe, 410 long nozzle. DETAILED DESCRIPTION

[0020] In order to better understand the above-mentioned technical scheme, the technical scheme of the embodiments of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the embodiments of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0021] The first embodiment of the present application provides a tundish device 10, such as Figure 1 and Figure 2 As shown, the tundish device 10 includes: a trough body 100, a powder spraying pipe 200 and a flow stabilizer 300. A powder spraying port 110 is provided on the side wall of the trough body 100. The powder spraying pipe 200 is connected to the powder spraying port 110. The powder spraying pipe 200 is used to spray a powdered medium into the trough body 100. The powdered medium can combine with sulfur in the metal liquid to form sulfide. The flow stabilizer 300 is connected to the bottom wall of the trough body 100. The flow stabilizer 300 is provided with an air jet 310. The air jet 310 is used to spray a gaseous medium into the trough body 100.

[0022] In this embodiment, the tank body 100 is used to contain molten metal, specifically, the molten metal can be molten steel. The powder spray tank is used to contain powdered medium, and the two ends of the powder spray pipe 200 are respectively connected to the powder spray port 110 and the powder spray tank, so that the powdered medium enters the tank body 100 through the powder spray port 110 on the side wall of the tank body 100 under high pressure and combines with sulfur in the molten metal to form sulfide.

[0023] The flow stabilizer 300 is located on the bottom wall of the tank body 100. The flow stabilizer 300 is provided with an air jet 310. The air jet 310 is connected to the air jet system through a nozzle, so that the air jet 310 can spray a gas medium with a spray pressure into the tank body 100. The gas medium is insoluble in the molten metal. When the molten metal covers the air jet 310, the gas medium forms an upward airflow in the molten metal.

[0024] Exemplarily, the powdered medium may be calcium oxide or calcium fluoride, the gaseous medium may be an inert gas, and the gaseous medium may be argon.

[0025] The powdered medium carries the sulfides in the molten metal and floats upward, and the gaseous medium continues to rise in the molten metal, and pushes the powdered medium and sulfides during the rising process, so that the powdered medium and sulfides can float to the metal slag layer on the top of the molten metal under the action of thrust, and are finally absorbed by the slag layer, thereby achieving the purpose of removing sulfur inclusions in the molten metal.

[0026] By adding a powder spraying and air jetting device to the tundish device 10, the metal is desulfurized during the continuous casting process, and the sulfur inclusions in the molten metal can be effectively removed in the final stage of continuous casting, thereby improving the purity of the molten metal, reducing the sulfide content in the metal product, and improving the performance quality of the metal. In addition, the powder spraying technology also evens out the flow field in the molten metal, improves and enhances the metallurgical reaction conditions in the molten metal, and lays a foundation for improving the quality of the metal in continuous casting.

[0027] Exemplarily, the shape of the flow stabilizer 300 is a cuboid, the lower end face of the cuboid is connected to the bottom wall of the tank body 100, the upper and lower end faces of the cuboid are square, the four side end faces are rectangular, the height of the cuboid is 500mm to 700mm, the side length of the end face square is 300mm to 400mm, and the wall thickness of the flow stabilizer 300 is 30mm to 100mm. The diameter of the jet port 310 is 20mm to 30mm.

[0028] Exemplarily, an immersion nozzle 120 is provided on the bottom wall of the tank body 100 , and the purified molten metal flows out through the immersion nozzle 120 .

[0029] In some embodiments provided in this application, Figure 1 As shown, optionally, the tundish device 10 further includes a liquid inlet pipe 400 , a long water port 410 is provided at the end of the liquid inlet pipe 400 , the flow stabilizer 300 is arranged opposite to the long water port 410 , and the air jet 310 is located at the top of the flow stabilizer 300 .

[0030] In this embodiment, the liquid inlet pipe 400 is located at the opening side of the tank body 100, and a long water port 410 is provided at the bottom of the liquid inlet pipe 400. The long water port 410 is opposite to the top of the flow stabilizer 300, and the flow stabilizer 300 is located below the long water port 410. The central axis of the flow stabilizer 300 coincides with the central axis of the long water port 410. After the molten metal flows into the tank body 100 through the liquid inlet pipe 400, it can directly fall on the top of the flow stabilizer 300, and the gas medium ejected from the jet nozzle 310 at the top of the flow stabilizer 300 is blown to the surroundings of the tank body 100, thereby improving the uniformity and diffusion speed of the molten metal in the tank body 100.

[0031] In some embodiments provided in this application, Figure 1 As shown, optionally, a groove 320 is provided on the top of the flow stabilizer 300 , and the air injection port 310 is provided on the bottom wall of the groove 320 .

[0032] In this embodiment, the top groove 320 of the flow stabilizer 300 can gather the molten metal discharged from the long water nozzle 410 to prevent the molten metal from dispersing immediately after falling on the flow stabilizer 300, thereby ensuring that the molten metal can splash toward the periphery under the action of the airflow ejected from the air jet 310, thereby improving the splashing effect of the gas medium on the molten metal.

[0033] Exemplarily, when projected downwardly along the central axis of the shroud 410 onto the bottom wall of the tank body 100 , the projection area of ​​the groove 320 is larger than the projection area of ​​the shroud 410 , and the depth of the groove 320 is 100 mm to 150 mm.

[0034] In some embodiments provided in this application, Figure 2 As shown, optionally, a guide groove 321 is provided on the bottom wall of the groove 320 , and a plurality of air jets 310 are provided, and the plurality of air jets 310 are distributed at intervals at the bottom of the guide groove 321 along the direction in which the guide groove 321 extends.

[0035] In this embodiment, part of the bottom wall of the groove 320 can be formed by a guide groove 321, which can guide the molten metal in the groove 320. A plurality of jet nozzles 310 are distributed at intervals at the bottom of the guide groove 321 along the direction in which the guide groove 321 extends, so that the molten metal flows to the plurality of jet nozzles 310 under the guidance of the guide groove 321, thereby expanding the spray range of the jet nozzle 310 and improving the spray intensity and uniformity of the gas medium on the molten metal.

[0036] In some embodiments provided in this application, Figure 2 As shown, optionally, there are multiple guide grooves 321 , and the arrangement direction of the multiple guide grooves 321 is different from the extension direction of the guide grooves 321 .

[0037] In this embodiment, a plurality of guide grooves 321 are arranged at intervals along the first direction, and any guide groove 321 extends along the second direction. Exemplarily, the first direction and the second direction may be perpendicular to each other. The jet nozzles 310 form a multi-row and multi-column array pattern on the top of the flow stabilizer 300, further expanding the jet range of the jet nozzles 310 and improving the jetting force and uniformity of the gas medium on the molten metal.

[0038] Exemplarily, the number of the guide grooves 321 may be 4, 6 or 8.

[0039] In some embodiments provided in this application, Figure 1 As shown, optionally, the guide groove 321 is a V-shaped groove or a U-shaped groove.

[0040] In this embodiment, the shape of the guide groove 321 is limited, the guide effect of the guide groove 321 is improved, and the processing difficulty of the guide groove 321 is reduced. Exemplarily, the angle of the V-shaped groove is 30° to 45°.

[0041] In some embodiments provided in this application, Figure 3 As shown, optionally, the powder spraying tube 200 includes a nozzle 210 , which is communicated with the powder spraying port 110 , and the nozzle 210 is a venturi tube.

[0042] In this embodiment, the nozzle 210 is located at the end of the tube body of the powder spraying tube 200, and the powder medium enters the tank body 100 through the nozzle 210. The venturi tube includes a contraction section, a throat and a diffusion section that are interconnected, and the diffusion section is a tapered tube. The flow velocity of the powder medium increases when flowing through the contraction section and the throat, thereby improving the flow velocity and spray uniformity of the powder medium.

[0043] Exemplarily, the distance between the nozzle 210 and the bottom wall of the tank body 100 is 200 mm to 300 mm. The diameter of the largest cross section of the nozzle 210 is 50 mm, and the diameter of the smallest cross section is 30 mm.

[0044] In some embodiments provided in the present application, optionally, the tundish device 10 further includes a support member, which is respectively connected to the flow stabilizer 300 and the bottom wall of the tank body 100 .

[0045] In this embodiment, the two ends of the support member are respectively connected to the side wall of the flow stabilizer 300 and the bottom wall of the tank body 100 to provide support for the flow stabilizer 300, prevent the flow stabilizer 300 from being deformed by the impact of the molten metal, and improve the stability of the flow stabilizer 300. Exemplarily, a plurality of support members are evenly distributed on the periphery of the flow stabilizer 300, and the cross-section of the support member may be L-shaped or triangular.

[0046] In a second aspect of the present application, an embodiment provides a method for desulfurization of smelted metals, such as Figure 4 As shown, using the tundish device provided by any of the first aspect embodiments, the desulfurization method for smelting metal includes: Step 101, the gas outlet injects the gas medium into the tank body; Step 102, injecting molten metal into the tank; Step 103, the powder spraying pipe sprays the powder medium into the tank body, so that the powder medium combines with the sulfur in the molten metal to form sulfides, and the sulfides float to the metal slag layer of the molten metal driven by the gas medium.

[0047] In this embodiment, molten metal is injected into the tank body after the jet port enters the jet state, and the powdered medium is sprayed into the tank body through the powder spraying pipe, so that the powdered medium combines with the sulfur in the molten metal to form sulfides, and the powdered medium carries the sulfides in the molten metal to float upward, and the gas medium continues to rise in the molten metal, and pushes the powdered medium and sulfides during the rising process, so that the powdered medium and sulfides can float to the metal slag layer on the top of the molten metal under the action of thrust, and are finally absorbed by the slag layer, thereby achieving the purpose of removing sulfur inclusions in the molten metal.

[0048] By adding powder spraying and air jetting operations to the tundish device, the metal is desulfurized during the continuous casting process. The sulfur inclusions in the molten metal can be effectively removed in the final stage of continuous casting, which improves the purity of the molten metal, reduces the sulfide content in the finished metal product, and improves the performance quality of the metal. In addition, the powder spraying technology also evens out the flow field in the molten metal, improves and enhances the metallurgical reaction conditions in the molten metal, and lays the foundation for improving the quality of continuous casting metal.

[0049] Exemplarily, the step of spraying the powder medium into the tank body through the powder spraying tube is specifically as follows: when the distance between the liquid surface of the molten metal and the top wall of the flow stabilizing member is less than a preset threshold, the powder spraying tube sprays the powder medium into the tank body.

[0050] In some embodiments provided in the present application, optionally, before the step of spraying the powdered medium into the tank body through the powder spraying tube, the step further includes: adding silicone oil to the powdered medium.

[0051] In this embodiment, silicone oil is added to the powdered medium to improve the fluidity of the powdered medium, thereby improving the flow rate and spraying uniformity of the powdered medium.

[0052] In a specific embodiment, a method for removing inclusions from molten steel in a tundish comprises the following steps: 1. Argon gas is blown in through the jet pipe; 2. When continuous casting starts, the molten steel flows in through the long water inlet 410 of the tundish. Under the action of the flow stabilizer 300, the molten steel splashes around the tundish. 3. Passivation powder; 4. When the molten steel is about to submerge the powder spray nozzle, start spraying powder to carry out the desulfurization task; 5. The powder carries the sulfur inclusions in the molten steel and floats upward. Due to the argon gas sprayed in the flow stabilizer 300, the powder and the inclusions float to the top slag layer under the action of lift and are finally absorbed by the slag layer, thereby achieving the task of removing sulfur inclusions in the molten steel; 6. The purified molten steel flows out through the submerged water inlet 120 of the tundish.

[0053] In the last step of tundish casting, the related art does not have powder spraying desulfurization refining technology, and the molten steel casting process will inevitably be contaminated again. However, the present invention adds powder spraying technology to the tundish, which can effectively remove sulfur inclusions in the molten steel in the final stage of continuous casting, greatly improving the purity of the molten steel. After the molten steel in the ladle enters the tundish from the long water inlet 410, it is distributed to the surroundings of the tundish under the action of the flow stabilizer 300. The tundish powder spraying technology also evens out the flow field in the molten steel, improves and enhances the metallurgical reaction conditions in the molten steel, and lays the foundation for the subsequent continuous casting of high-quality steel grades.

[0054] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0056] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation 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.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tundish device, characterized in that: include: A tank body, wherein a powder spraying port is provided on the side wall of the tank body; A powder spraying pipe is connected to the powder spraying port, and is used to spray a powder medium into the tank body, wherein the powder medium can combine with sulfur in the molten metal to form sulfide; A flow stabilizing member is connected to the bottom wall of the tank body, and a jet nozzle is provided on the flow stabilizing member, and the jet nozzle is used to inject gas medium into the tank body.

2. The tundish device according to claim 1, characterized in that: Also includes: A liquid inlet pipe, wherein a long water outlet is arranged at the end of the liquid inlet pipe, the flow stabilizing member is arranged opposite to the long water outlet, and the air jet is located at the top of the flow stabilizing member.

3. The tundish device according to claim 1, characterized in that: The top of the flow stabilizing member is provided with a groove, and the air jet is arranged on the bottom wall of the groove.

4. The tundish device according to claim 3, characterized in that: The bottom wall of the groove is provided with a guide groove, and the number of the air jets is multiple, and the multiple air jets are distributed at intervals at the bottom of the guide groove along the direction in which the guide groove extends.

5. The tundish device according to claim 4, characterized in that: There are multiple guide grooves, and the arrangement direction of the multiple guide grooves is different from the extension direction of the guide grooves.

6. The tundish device according to claim 4, characterized in that: The guide groove is a V-shaped groove or a U-shaped groove.

7. The tundish device according to any one of claims 1 to 6, characterized in that: The powder spraying tube comprises: A nozzle is connected to the powder spraying port, and the nozzle is a venturi tube.

8. The tundish device according to any one of claims 1 to 6, characterized in that: Also includes: The supporting member is respectively connected to the flow stabilizing member and the bottom wall of the trough body.

9. A method for desulfurization of smelting metals, characterized in that: Using the tundish device according to any one of claims 1 to 8, the method for desulfurizing smelted metal comprises: The jet nozzle sprays the gas medium into the tank body; Injecting molten metal into the tank; The powder spraying pipe sprays powdered medium into the tank body, so that the powdered medium combines with sulfur in the molten metal to form sulfides, and the sulfides float to the metal slag layer of the molten metal driven by the gas medium.

10. The method for desulfurization of smelted metal according to claim 9, characterized in that: Before the step of spraying the powder medium into the tank by the powder spraying pipe, the method further comprises: Silicone oil is added to the powdery medium.

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