Mold for forming a slag zone of a ladle and method for forming a ladle

Abstract

The application discloses a ladle slag zone forming die and a ladle forming method thereof. The ladle slag zone forming die comprises a die body, a lug arranged on the die body, a vibrating hole arranged on the upper surface of the die body and a carbon fiber cloth adhered to the lower surface of the die body. The lower surface of the die body is in a slope structure to form a slope bottom surface structure of the slag zone. The carbon fiber cloth is impregnated with an impregnating liquid to be adhered to the lower surface of the die body. The impregnating liquid is a solvent-free high-temperature resistant adhesive. The ladle is formed by using the ladle slag zone forming die. Compared with the multiple pouring mode in the prior art, the forming efficiency of the ladle is greatly improved, and the manufacturing process of the ladle is greatly simplified. Meanwhile, the improved ladle structure is optimal. The upper shallow and lower deep slag zone formed after the die body is taken out is beneficial to the discharge of molten steel and reduces the amount of residual molten steel.

Description

Technical Field

[0001] This invention relates to the field of steelmaking technology, and mainly to a ladle slag containment zone forming mold and a ladle forming method thereof. Background Technology

[0002] Besides holding molten steel, the ladle plays an increasingly important role as a refining vessel. Reducing iron consumption and increasing the scrap ratio have become the current development direction of low-carbon metallurgy in converters. Adding scrap steel to the refining process has become an effective measure to reduce iron consumption. In addition, the continuous casting process has been striving to turn qualified molten steel into qualified slabs to the greatest extent possible.

[0003] However, towards the end of the ladle casting process, when the molten steel level drops to a certain height, the combined effects of the Coriolis force caused by the Earth's rotation, the circulation induced by uneven flow field, and the potential energy of the fluid itself during outflow cause vortices to form in the molten steel, resulting in slag entrainment. This causes some ladle slag to enter the tundish, contaminating the molten steel in the tundish. To avoid similar incidents, steel mills have adopted a ladle slag detection and control system: towards the end of the ladle casting process, when a certain amount of slag is detected in the mixed flow of steel and slag, the ladle slide plate automatically closes, leaving approximately 5-7 tons of molten steel in the ladle. This ensures the quality of the cast billet, but excessive amounts of qualified molten steel turning into slag steel reduce the billet yield.

[0004] In production, to maximize the pouring of molten steel into the ladle and control the amount of slag, setting up a slag-prevention zone near the tap hole at the bottom of the ladle is an effective measure. However, in existing technologies, setting up the slag-prevention zone usually involves constructing a stepped bottom surface with refractory bricks or using a staged pouring method. These ladle forming methods are complex and have low processing efficiency. Summary of the Invention

[0005] The main objective of this invention is to provide a ladle slag containment zone forming mold and a ladle forming method thereof, which is intended to facilitate the forming of the slag containment zone of the ladle.

[0006] To achieve the above objectives, the present invention provides a ladle slag containment zone forming mold, comprising a mold body, lifting lugs disposed on the mold body, vibration holes formed on the upper surface of the mold body, and carbon fiber cloth adhered to the lower surface of the mold body. The lower surface of the mold body has an inclined structure to form the inclined bottom structure of the slag containment zone. The carbon fiber cloth is impregnated with an impregnation liquid to adhere to the lower part of the mold body. The impregnation liquid is a solvent-free, high-temperature resistant adhesive.

[0007] Preferably, the impregnation solution contains 55%-60% by weight of organosilicon boron resin modified bisphenol A epoxy resin, 35%-40% by weight of AG-80 epoxy resin, and 3%-7% by weight of modified imidazole as a curing agent.

[0008] Preferably, the mold body has an isosceles trapezoidal structure when viewed from above, and a right-angled trapezoidal structure when viewed from the side.

[0009] Preferably, the depth of the vibration hole is 10mm-30mm and the diameter of the vibration hole is 70mm-120mm.

[0010] Preferably, the thickness of the carbon fiber cloth is 0.05mm-0.8mm, and the lower surface of the mold body is inclined at an angle of 10°-20° relative to its upper surface.

[0011] This invention further proposes a ladle forming method based on the above-mentioned ladle slag-retaining zone forming mold, comprising the following steps:

[0012] After applying lubricating grease to the surface of the ladle slag containment area forming mold, the impregnated carbon fiber cloth is then attached to the lower surface of the ladle slag containment area forming mold.

[0013] Place sprue seat bricks, permeable bricks, impact bricks and sprue molds inside the steel ladle and steel shell, and pour castable to form the bottom working layer;

[0014] Hoist the ladle slag containment area forming mold to the vicinity of the sprue mold. After the ladle slag containment area forming mold is close to and aligned with the sprue mold, place the mold on the upper surface of the castable. Insert the vibrator into the vibration hole and start the vibration. Stop the vibration when the mold sinks to the upper surface of the castable.

[0015] After the ladle reaches the curing time, the ladle slag protection area forming mold and the sprue mold are removed in sequence. The carbon fiber cloth separates from the ladle slag protection area forming mold and is bonded to the castable.

[0016] Preferably, 5-10 minutes after the bottom working layer is poured, the ladle slag protection area forming mold is hoisted to the vicinity of the sprue mold.

[0017] Preferably, after the step of sequentially removing the ladle slag-prevention zone forming mold and the sprue mold after the ladle has reached the curing time, the method further includes:

[0018] Clean the refractory material from the gap between the ladle slag protection area forming mold and the sprue mold and the ladle seat brick.

[0019] Preferably, when applying lubricating grease to the surface of the ladle slag-preparing mold, the thickness of the lubricating grease is 1mm-2mm.

[0020] Preferably, the impact brick is a corundum precast component, and the side of the forming mold for the ladle slag containment area is fitted to the sprue seat brick.

[0021] The use of this ladle slag-preparing mold to form the ladle significantly improves forming efficiency and simplifies the manufacturing process compared to existing methods involving multiple castings or multi-layer brickwork. Furthermore, the improved ladle structure is optimized; the shallow-top, deep-bottom slag-preparing zone formed after removing the mold facilitates molten steel drainage and reduces residual molten steel. Attached Figure Description

[0022] Figure 1 This is a top view schematic diagram of the ladle slag-prevention zone forming mold of the present invention;

[0023] Figure 2 This is a side view of the slag-prevention zone forming mold of the present invention.

[0024] Figure 3 This is a top view schematic diagram of the steel ladle formed by the forming mold of the slag-prevention zone of the present invention.

[0025] Figure 4 This is a flowchart illustrating the ladle forming method using a mold for the ladle slag containment area.

[0026] In the diagram, 1-lifting lug, 2-mold body, 3-vibration hole, 4-sprue seat brick, 5-slag protection zone, 6-breathable brick, 7-impact brick.

[0027] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0029] It should be noted that in the description of this invention, the terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] This invention proposes a molding die for the slag containment zone of a steel ladle.

[0031] Reference Figures 1 to 3In this preferred embodiment, a steel ladle slag containment zone forming mold includes a mold body 2, a lifting lug 1 disposed on the mold body 2, a vibration hole 3 opened on the upper surface of the mold body 2, and a carbon fiber cloth pasted on the lower surface of the mold body 2, wherein the lower surface of the mold body 2 has a slope structure to form the slope bottom structure of the slag containment zone 5.

[0032] In this embodiment, the lower surface of the mold body 2 has a sloping structure, so that the area formed after the mold body 2 is removed is shallow at the top and deep at the bottom, which is conducive to the discharge of molten steel and reduces the amount of molten steel left in the casting.

[0033] In this embodiment, at least three lifting lugs 1 are provided, which are welded to the upper surface of the mold body 2, with two lifting lugs 1 symmetrically distributed on both sides of the vibration hole 3. The mold body 2 is integrally machined from a 30-60mm thick steel plate.

[0034] Furthermore, the carbon fiber cloth is impregnated with an impregnation liquid to bond it to the underside of the mold body 2. The impregnation liquid is a solvent-free, high-temperature resistant adhesive.

[0035] In this embodiment, the impregnation solution contains 55%-60% by weight of organosilicon boron resin modified bisphenol A epoxy resin, 35%-40% by weight of AG-80 epoxy resin, and 3%-7% by weight of modified imidazole as a curing agent.

[0036] After impregnation treatment, carbon fiber cloth exhibits good thermal stability. During ladle baking, the impregnation liquid inside the fiber cloth penetrates 2-3 mm into the refractory material surface, reducing stress concentration and preventing cracking, thus achieving a toughening effect. The impregnated carbon fiber cloth itself is adhesive, therefore, it can be adhered to the surface of the ladle slag-preparing mold.

[0037] In this embodiment, the mold body 2 is viewed from a top-down direction (e.g., Figure 1 As shown, the mold body 2 has an isosceles trapezoidal structure, and the mold body 2 is viewed from the side (as shown). Figure 2 As shown, it has a right-angled trapezoidal structure. The depth of the vibration hole 3 is 10mm-30mm, the diameter of the vibration hole 3 is 70mm-120mm, the thickness of the carbon fiber cloth is 0.05mm-0.8mm, and the lower surface of the mold body 2 is inclined at an angle of 10°-20° relative to its upper surface. This angle control is most conducive to the discharge of molten steel and reduces the amount of molten steel left in the casting.

[0038] Specifically, when viewed from above, the width of the small end of the mold body 2 is 350-420mm, the width of the large end is 520-580mm, and the length of the mold body 2 is 650-700mm.

[0039] The process of using the forming mold for the slag-retaining area of ​​this steel ladle is as follows:

[0040] The carbon fiber cloth is impregnated with an impregnating agent. After applying lubricating grease to the surface of the ladle slag-prevention area forming mold, the impregnated carbon fiber cloth is pasted onto the lower surface of the ladle slag-prevention area forming mold.

[0041] Reference Figure 3 Place the sprue seat brick 4, the vent brick 6, the impact brick 7 and the sprue mold (the sprue mold is placed above the sprue seat brick 4) inside the steel ladle and steel shell, and pour the castable to form the bottom working layer.

[0042] Hoist the ladle slag containment area forming mold to the vicinity of the sprue mold. After the ladle slag containment area forming mold is close to and aligned with the sprue mold, place the mold on the upper surface of the castable. Insert the vibrator into the vibration hole 3 and start the vibration. Stop the vibration when the mold sinks to the upper surface of the castable.

[0043] After the ladle reaches the curing time, the ladle slag protection area forming mold and the sprue mold are removed in sequence. The carbon fiber cloth separates from the ladle slag protection area forming mold and is bonded to the castable.

[0044] Using this ladle slag-retaining zone forming mold to form the ladle significantly improves forming efficiency and simplifies the manufacturing process compared to existing technologies that involve multiple castings or multi-layer brickwork. Furthermore, the improved ladle structure is optimized; the shallow-top, deep-bottom slag-retaining zone 5 formed after removing the mold body 2 facilitates molten steel drainage and reduces the amount of molten steel residue. Three months of ladle casting residue tracking results show an average reduction of 1.5 tons per ladle, demonstrating significant economic benefits.

[0045] The present invention further proposes a ladle forming method using a ladle slag-prevention zone forming mold.

[0046] In this preferred embodiment, a ladle forming method based on the above-mentioned ladle slag-retaining zone forming mold includes the following steps:

[0047] Step S10: After applying lubricating grease to the surface of the ladle slag containment area forming mold, attach the impregnated carbon fiber cloth to the lower surface of the ladle slag containment area forming mold.

[0048] Step S20: Place the sprue seat brick 4, the vent brick 6, the impact brick 7 and the sprue mold inside the steel ladle and steel shell, and pour castable (corundum castable can be used) to form the bottom working layer.

[0049] Step S30: Hoist the ladle slag containment area forming mold to the vicinity of the sprue mold, and after the ladle slag containment area forming mold is close to and aligned with the sprue mold, place the mold on the upper surface of the casting material, insert the vibrator into the vibration hole 3 and start the vibration. Stop the vibration when the mold sinks to the upper surface of the casting material.

[0050] Step S40: After the ladle reaches the curing time, the ladle slag-prevention zone forming mold and the sprue mold are taken out in sequence. The carbon fiber cloth separates from the ladle slag-prevention zone forming mold and is bonded to the casting material.

[0051] In step S20, 5-10 minutes after the bottom working layer is poured, the ladle slag protection area forming mold is hoisted to the vicinity of the sprue mold.

[0052] Furthermore, step S40 is followed by:

[0053] Step S50: Clean the casting material in the gap between the ladle slag-prevention area forming mold and the sprue mold and the ladle seat brick.

[0054] In step S10, when applying lubricating grease to the surface of the ladle slag containment mold, the grease thickness is 1mm-2mm. In step S20, the impact brick 7 is a corundum precast component, and the side of the ladle slag containment mold is fitted to the nozzle seat brick 4. Because the side of the ladle slag containment mold is fitted to the nozzle seat brick 4, the ladle is less prone to eddy currents, erosion, and peeling during operation.

[0055] The ladle forming method of the ladle slag containment zone forming mold proposed in this invention is simple and easy to operate, and can greatly improve the ladle production efficiency.

[0056] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A forming mold for the slag containment zone of a steel ladle, characterized in that, The device includes a mold body, lifting lugs on the mold body, vibration holes on the upper surface of the mold body, and carbon fiber cloth adhered to the lower surface of the mold body. The lower surface of the mold body has a sloping structure to form the sloping bottom structure of the slag-prevention zone. The carbon fiber cloth is impregnated with an impregnation liquid to adhere it to the lower part of the mold body. The impregnation liquid is a solvent-free, high-temperature resistant adhesive. The impregnation liquid contains 55%-60% by weight of organosilicon boron resin modified bisphenol A epoxy resin, 35%-40% by weight of AG-80 epoxy resin, and 3%-7% by weight of modified imidazole as a curing agent. The mold body has an isosceles trapezoidal structure when viewed from above and a right-angled trapezoidal structure when viewed from the side.

2. The ladle slag containment zone forming mold as described in claim 1, characterized in that, The depth of the vibration hole is 10mm-30mm, and the diameter of the vibration hole is 70mm-120mm.

3. The ladle slag containment zone forming mold as described in claim 1 or 2, characterized in that, The thickness of the carbon fiber cloth is 0.05mm-0.8mm, and the lower surface of the mold body is inclined at an angle of 10°-20° relative to its upper surface.

4. A ladle forming method based on the ladle slag containment zone forming mold according to any one of claims 1 to 3, characterized in that, Includes the following steps: After applying lubricating grease to the surface of the ladle slag containment area forming mold, the impregnated carbon fiber cloth is then attached to the lower surface of the ladle slag containment area forming mold. Place sprue seat bricks, permeable bricks, impact bricks and sprue molds inside the steel ladle and steel shell, and pour castable to form the bottom working layer; Hoist the ladle slag containment area forming mold to the vicinity of the sprue mold. After the ladle slag containment area forming mold is close to and aligned with the sprue mold, place the mold on the upper surface of the castable. Insert the vibrator into the vibration hole and start the vibration. Stop the vibration when the mold sinks to the upper surface of the castable. After the ladle reaches the curing time, the ladle slag protection area forming mold and the sprue mold are removed in sequence. The carbon fiber cloth separates from the ladle slag protection area forming mold and is bonded to the castable.

5. The ladle forming method using the ladle slag containment zone forming mold as described in claim 4, characterized in that, Five to ten minutes after the bottom working layer is poured, the ladle slag protection area forming mold is hoisted to the vicinity of the sprue mold.

6. The ladle forming method using the ladle slag containment zone forming mold as described in claim 4, characterized in that, After the ladle reaches the curing time, the step of sequentially removing the ladle slag-prevention zone forming mold and the sprue mold further includes: Clean the refractory material from the gap between the ladle slag protection area forming mold and the sprue mold and the ladle seat brick.

7. The ladle forming method using the ladle slag containment zone forming mold as described in claim 4, characterized in that, When applying lubricating grease to the surface of the ladle slag removal area forming mold, the thickness of the lubricating grease should be 1mm-2mm.

8. The ladle forming method using the ladle slag containment zone forming mold as described in claim 4, characterized in that, The impact brick is a corundum precast component, and the side of the forming mold for the ladle slag protection area is fitted with the sprue seat brick.

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