A steel ladle pouring and diversion device and method

Abstract

This invention relates to a steel ladle pouring diversion device and method. An ejector cover is placed on top of the nozzle seat brick. The left edge of the ejector cover is fitted onto the nozzle seat brick via a rounded corner connection structure, and the right edge of the ejector cover is fitted onto the nozzle seat brick via a stepped connection structure. The area between the lower edge of the right half of the ejector cover and the nozzle seat brick is the ejector gas impact zone. An ejector gas passage is provided inside the seat brick sleeve, connecting one end of the ejector gas passage to a semi-circular seam, and the ejector gas impact zone to the other end of the semi-circular seam. The advantages of this invention are: traditional diversion sand processes contaminate the molten steel, leading to an increase in oxygen content; compared to traditional diversion sand processes, this invention almost completely eliminates the contamination of the molten steel by the diversion sand; the initial pouring success rate is higher than traditional diversion methods; the equipment is simple, requiring less investment; operation is simple, maintenance is easy, and operating costs are low.

Description

Technical Field

[0001] This invention relates to a steel ladle pouring and diversion device and method. Background Technology

[0002] Currently, during the pouring process in continuous casting and casting, ladle sand is used to fill the holes in the ladle's base bricks, isolating the molten steel from the slide plate and protecting it. The sand at the top of the base bricks begins to sinter under the high temperature of the molten steel. When the slide plate is opened, the loose sand at the bottom flows out automatically, and the sintered layer at the top breaks under the static pressure of the molten steel, allowing the molten steel to flow out as well. This process is called automatic ladle opening. In actual production, situations often arise where the ladle cannot open automatically, forcing steel companies to resort to oxygen burning to remove the blocked sand. However, oxygen burning not only severely degrades the cleanliness of the molten steel but also poses safety hazards and affects production efficiency. Therefore, steel companies prioritize improving the automatic ladle opening rate, aiming for 100% automatic opening. Furthermore, because the sand is fine and fragile, it is difficult for it to float, and its inflow into the tundish can increase inclusions in the molten steel.

[0003] In the prior art, patent application number 201910889827.5, entitled "A type of diversion sand and its preparation method," discloses a method for preparing, packaging, and layering diversion sand. The diversion sand comprises 30%–50% chromium-based diversion sand and 50%–70% composite diversion sand by weight. The composite diversion sand is either magnesia-based or silica-based. The chromium-based diversion sand comprises: 65%–80% chromite sand, 12%–16% quartz sand, 4%–6% magnesia sand, and 6%–8% alumina balls by weight. The first batch of potassium feldspar contains 3%–5% potassium feldspar and 1%–3% carbon agent; the first batch of chromite sand contains ≥46–51 wt% Cr2O3 and has a particle size of 0.15–2 mm; the first batch of quartz sand contains ≥98.0 wt% SiO2; the first batch of magnesia contains ≥98.0 wt% MgO; the first batch of alumina spheres contains ≥75.0 wt% Al2O3; the first batch of potassium feldspar contains >8 wt% K2O; and the first batch of graphite and carbon black both contain >92 wt% C. This allows for the layered and quantitative addition of diversion sand, improving the ladle self-opening rate and reducing the production cost of diversion sand. Patent application number 202010123667.6, entitled "A Method for Filling a Double-Layer Drainage Sand and Its Application," discloses a method for filling a double-layer drainage sand. The method includes filling a drainage material at the top nozzle of a steel ladle. The upper layer of the drainage material is drainage sand A, which is selected from one or more of magnesium olivine drainage sand, silica drainage sand, zirconium drainage sand, or chromite drainage sand. The lower layer of the drainage material is drainage sand B, which, by weight percentage, contains MgO: 98-99%, SiO2: 0.3-0.65%, and Fe2O3. 3： The filling method of this invention reduces inclusions in molten steel without affecting the automatic pouring rate of molten steel, with the following components: 0.2-0.6%, C: 0.3-0.7%, S: 0.008-0.012%, H2O: 0.06-0.1%.

[0004] The diversion sand and preparation methods mentioned in the two patent documents can both achieve the function of diversion, but they both have inherent shortcomings such as low casting rate and contamination of molten steel. Therefore, neither of them can meet the technical requirements of high automatic casting rate and no contamination of molten steel.

[0005] Given the shortcomings of the aforementioned sand diversion process, there is an urgent need to develop a diversion technology that has a high automatic casting rate and does not contaminate the molten steel. Summary of the Invention

[0006] The purpose of this invention is to provide a steel ladle pouring and diversion device and method, which improves the automatic opening rate of steel ladle and achieves the technical requirement of not contaminating molten steel during pouring.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A steel ladle pouring and diversion device includes a refractory layer 4, a seat brick sleeve 10, a nozzle seat brick 2, and a sliding plate 5, all built into the bottom of the ladle. The refractory layer 4, seat brick sleeve 10, and nozzle seat brick 2 are arranged sequentially from the outside to the inside. A sliding plate is provided at the lower end of the nozzle. The device also includes an ejector cover 1, an ejector gas passage 3, an ejector gas impact zone 8, and an ejector gas passage semi-circular seam 9. The ejector cover 1 covers the top of the nozzle seat brick 2. The left half of the ejector cover 1 is fitted onto the nozzle seat brick 2 through a rounded corner connecting structure. The right half of the ejector cover 1 is fitted onto the nozzle seat brick 2 through a stepped connecting structure. The lower edge of the right half of the ejector cover 1 and the nozzle seat brick 2 form the ejector gas impact zone 8. The seat brick sleeve 10 contains the ejector gas passage 3. The ejector gas passage 3 is connected to one end of the ejector gas passage semi-circular seam 9, and the ejector gas impact zone 8 is connected to the other end of the ejector gas passage semi-circular seam 9.

[0009] The stepped connection structure is located on the lower right half of the ejection cover plate 1. The bottom step width f of the stepped connection structure is smaller than the top step width k of the stepped connection structure, and the bottom step height d of the stepped connection structure is smaller than the thickness h of the ejection cover plate 1.

[0010] The bottom step width f of the ejection cover plate 1 is 5-20mm, the top step width k of the ejection cover plate 1 is 7-25mm, the thickness h of the ejection cover plate 1 is 10-50mm, and the bottom step height d of the ejection cover plate 1 is 1-10mm; a rounded corner connecting structure is provided on the lower edge of the left half of the ejection cover plate 1, and a horizontal fitting gap m is provided between the left half of the ejection cover plate 1 and the seat brick sleeve 10, with the horizontal fitting gap m ranging from 0 to 0.8mm.

[0011] The ejection cover plate 1 has an embedded ejection cover plate cavity 7.

[0012] The ejection cover 1 is disc-shaped.

[0013] The upper surface of the ejection cover plate 1 and the upper surface of the seat brick sleeve 10 are on the same horizontal plane.

[0014] A method for diverting water during steel ladle pouring includes:

[0015] S1. The ejector cover 1 is baked together with the molten steel ladle, then filled with molten steel and placed in the pouring position;

[0016] S2. Connect ejection gas path 3 to the high-pressure argon gas source and open the slide plate;

[0017] S3. Open the control valve of the high-pressure argon gas source and connect the ejection gas path 3 to the fully open state. The high-pressure argon gas enters the ejection gas impact zone 8 through the ejection gas path 3 and the ejection gas path semi-circular seam 9. The bottom surface of the ejection cover plate 1 is ejected to the upper left by the high pressure.

[0018] S4. As the ejector cover 1 is ejected into the molten steel, it is buoyed by the molten steel and floats up until it reaches the surface.

[0019] S5. Molten steel flows out from the nozzle seat brick 2 and the slide plate 5, and pouring begins;

[0020] S6. Reduce the opening of the control valve of the high-pressure argon gas source connected to the ejection gas path 3 to maintain the gas flow so that the semi-circular seam 9 of the ejection gas path is not blocked by molten steel until the casting is completed.

[0021] S7. Install a new ejection cover 1 during the preparation of the molten steel ladle.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. The traditional quenching sand process contaminates the molten steel, leading to an increase in the oxygen content of the molten steel. Compared with the traditional quenching sand process, the present invention almost completely eliminates the contamination of the molten steel by the quenching sand.

[0024] 2. The success rate of initial pouring is higher than that of traditional diversion methods;

[0025] 3. The equipment is simple and requires little investment;

[0026] 4. It is easy to operate and maintain, and has low operating costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the working process of a steel ladle pouring and diversion device.

[0028] Figure 2 This is a schematic diagram of a steel ladle pouring and diversion device.

[0029] Figure 3 This is a schematic diagram of the ejector cover structure of a steel ladle pouring and diversion device;

[0030] Figure 4 This is a schematic diagram of the gas impact zone of the ejection cover.

[0031] In the diagram: 1-Ejection cover plate 2-Sprue seat brick 3-Ejection gas passage 4-Refractory layer of molten steel tank 5-Slide plate 6-Molten steel tank shell 7-Ejection cover plate cavity 8-Ejection gas impact zone 9-Ejection gas passage semi-circular seam 10-Seat brick sleeve. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0033] See Figures 1-4A steel ladle pouring and diversion device includes a refractory layer 4, a seat brick sleeve 10, a nozzle seat brick 2, a sliding plate 5, an ejector cover 1, an ejector gas passage 3, an ejector gas impact zone 8, and an ejector gas passage semi-circular joint 9, all built into the bottom of the ladle. The refractory layer 4, seat brick sleeve 10, and nozzle seat brick 2 are arranged sequentially from the outside to the inside. A sliding plate is provided at the lower end of the nozzle. The ejector cover 1 covers the top of the nozzle seat brick 2. The upper surface of the ejector cover 1 is at the same level as the upper surface of the seat brick sleeve 10. The left half of the ejector cover 1 is fitted onto the nozzle seat brick 2 through a rounded corner connecting structure. The rounded corner connecting structure is located at the lower edge of the left half of the ejector cover 1. A horizontal fitting gap m is provided between the left half of the ejector cover 1 and the seat brick sleeve 10, with the horizontal fitting gap m ranging from 0 to 0.8 mm. The right half of the ejector cover 1 is fitted onto the nozzle seat brick 2 through a stepped connecting structure. On brick 2, a stepped connection structure is located on the lower right half of the ejector cover 1. The bottom step width f of the stepped connection structure is smaller than the top step width k of the stepped connection structure, and the bottom step height d of the stepped connection structure is smaller than the thickness h of the ejector cover 1. The bottom step width f of the ejector cover 1 is 5-20mm, the top step width k of the ejector cover 1 is 7-25mm, the thickness h of the ejector cover 1 is 10-50mm, and the bottom step height d of the ejector cover 1 is 1-10mm. The lower right half of the ejector cover 1 is located between the ejector gas impact zone 8 and the water inlet seat brick 2. The seat brick sleeve 10 is provided with an ejector gas passage 3. The ejector gas passage 3 is connected to one end of the ejector gas passage semi-circular seam 9, and the ejector gas impact zone 8 is connected to the other end of the ejector gas passage semi-circular seam 9. An ejector cover cavity 7 is pre-embedded inside the ejector cover 1. The ejector cover 1 is disc-shaped.

[0034] A method for diverting water during steel ladle pouring includes:

[0035] S1. The ejector cover 1 is baked together with the molten steel ladle, then filled with molten steel and placed in the pouring position;

[0036] S2. Connect ejection gas path 3 to the high-pressure argon gas source and open the slide plate;

[0037] S3. Open the control valve of the high-pressure argon gas source and connect the ejection gas path 3 to the fully open state. The high-pressure argon gas enters the ejection gas impact zone 8 through the ejection gas path 3 and the ejection gas path semi-circular seam 9. The bottom surface of the ejection cover plate 1 is ejected to the upper left by the high pressure.

[0038] S4. As the ejector cover 1 is ejected into the molten steel, it is buoyed by the molten steel and floats up until it reaches the surface.

[0039] S5. Molten steel flows out from the nozzle seat brick 2 and the slide plate 5, and pouring begins;

[0040] S6. Reduce the opening of the control valve of the high-pressure argon gas source connected to the ejection gas path 3 to maintain the gas flow so that the semi-circular seam 9 of the ejection gas path is not blocked by molten steel until the casting is completed.

[0041] S7. Install a new ejection cover 1 during the preparation of the molten steel ladle.

[0042] The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0043]

Example 1

[0044] A steel ladle pouring and diversion device is provided for pouring 260-ton steel ladles in a continuous casting process. The ejector cover 1 is made of refractory material with chromium oxide as the main component; it has a hollow structure, an overall density of 2.5 × 10³ kg / m³, and a diameter of 160 mm; the upper surface is a circular plane, which aligns with the upper surface of the seat brick sleeve 10 after installation; the lower edge radius of the left half is 8 mm, and the right half is stepped; the values ​​of f are 10 mm, k is 13 mm, h is 30 mm, and d is 5 mm. The ejector gas passage 3 is embedded in the refractory layer 4 of the steel ladle and the seat brick sleeve 10, as shown in the figure. Figure 1 The ejection gas path semi-circular seam 9 is a semi-circular seam structure with a seam height of 1.0 mm; the ejection gas impact zone 8 is shown in the figure. Figure 4 The gray area has an "m" value of 0.6 mm.

[0045] A method for diverting molten steel during pouring, comprising the following steps:

[0046] S1. Prepare ejector cover plate 1, nozzle seat brick 2, ejector gas passage 3, ejector cover plate cavity 7, ejector gas impact zone 8, ejector gas passage semi-circular seam 9, and seat brick sleeve 10, and install them at the nozzle position of the steel tank.

[0047] S2. It is baked together with the molten steel ladle, then filled with molten steel and placed in the pouring position.

[0048] S3. Connect ejection gas path 3 to the high-pressure argon gas source and open the slide plate.

[0049] S4. Open the control valve of the high-pressure argon gas source and connect the ejection gas path 3 to the fully open state. At this moment, the high-pressure argon gas quickly enters the ejection gas impact zone 8 through the ejection gas path semi-annular seam 9 of the ejection gas path 3. The bottom surface of the ejection cover plate 1 is ejected to the upper left under the action of high pressure. Since the action area of ​​the right half is much larger than that of the left half, the ejection direction is to the upper left.

[0050] S5. As the ejector cover 1 is ejected into the molten steel, it is accelerated to rise to the surface by the buoyancy of the molten steel.

[0051] S6. The molten steel flows out from the nozzle seat brick 2 and the slide plate, and the pouring begins. The opening of the control valve of the ejector gas circuit 3 connected to the high-pressure argon gas source is reduced to maintain the gas flow rate at 0.003 m3 / min so that the semi-circular seam 9 of the ejector gas circuit is not blocked by molten steel until the pouring is completed.

[0052] S7. Install a new ejection cover 1 during the preparation of the molten steel ladle.

[0053] After six months of use, the casting rate reached 100%. Compared with the traditional induced sand process, the total oxygen content of the resulting continuous casting billet was reduced by 10% (total oxygen content is used to indicate the purity of steel), almost eliminating the contamination of molten steel by the induced sand.

[0054]

Example 2

[0055] A steel ladle pouring and diversion device is provided for pouring 180-ton steel ladles in a continuous casting process. The ejector cover plate 1 is made of refractory material with chromium oxide as the main component; it has a hollow structure, an overall density of 2.3×10³ kg / m³, and a diameter of 150 mm; the upper surface is a circular plane, which aligns with the upper surface of the seat brick sleeve 10 after installation; the lower edge radius of the left half is 6 mm, and the right half is stepped; the f value is 9 mm, the k value is 12 mm, the h value is 25 mm, and the d value is 5 mm; the ejector air passage 3 is embedded in the refractory layer 4 of the steel ladle and the seat brick sleeve 10, as shown in the figure. Figure 1 The ejection gas path semi-circular seam 9 is a semi-circular seam structure with a seam height of 1.1 mm; the ejection gas impact zone 8 is shown in [reference needed]. Figure 4 The gray area has an "m" value of 0.5mm.

[0056] A method for diverting molten steel during pouring, comprising the following steps:

[0057] S1. Prepare ejector cover plate 1, nozzle seat brick 2, ejector gas passage 3, ejector cover plate cavity 7, ejector gas impact zone 8, ejector gas passage semi-circular seam 9, and seat brick sleeve 10, and install them at the nozzle position of the steel tank.

[0058] S2. It is baked together with the molten steel ladle, then filled with molten steel and placed in the pouring position.

[0059] S3. Connect ejection gas path 3 to the high-pressure argon gas source and open the slide plate;

[0060] S4. Open the control valve of the high-pressure argon gas source and connect the ejection gas path 3 to the fully open state. At this moment, the high-pressure argon gas quickly enters the ejection gas impact zone 8 through the ejection gas path semi-annular seam 9 of the ejection gas path 3. The bottom surface of the ejection cover plate 1 is ejected to the upper left under the action of high pressure. Since the action area of ​​the right half is much larger than that of the left half, the ejection direction is to the upper left.

[0061] S5. As the ejector cover 1 is ejected into the molten steel, it is accelerated to rise to the surface by the buoyancy of the molten steel.

[0062] S6. Molten steel flows out from the nozzle seat brick 2 and the slide plate, and pouring begins. The opening of the control valve of the high-pressure argon gas source connected to the ejector gas circuit 3 is reduced to maintain the gas flow rate at 0.0025 m3 / min so that the semi-circular seam 9 of the ejector gas circuit is not blocked by molten steel until the pouring is completed.

[0063] S7. Install a new ejection cover 1 during the preparation of the molten steel ladle.

[0064] After 10 months of use, the casting rate reached 100%; compared with the traditional dredging sand process, the total oxygen content of the resulting continuous casting billet was reduced by 9% (total oxygen content is used to indicate the purity of steel), almost eliminating the contamination of molten steel by dredging sand.

[0065] The traditional sand-draining process of this invention contaminates the molten steel, leading to an increase in the oxygen content of the molten steel. Compared with the traditional sand-draining process, this invention almost completely eliminates the contamination of the molten steel by the sand-draining process; the success rate of casting is higher than that of the traditional sand-draining method; the equipment is simple and requires less investment; it is easy to operate and maintain, and has low operating costs.

Claims

1. A steel ladle pouring and diversion device, comprising a refractory layer, a brick seat, a nozzle seat brick, and a sliding plate built into the bottom of the ladle, wherein the refractory layer, the brick seat, and the nozzle seat brick are arranged sequentially from the outside to the inside, and a sliding plate is provided at the lower end of the nozzle, characterized in that, It also includes an ejector cover plate, an ejector gas path, an ejector gas impact zone, and an ejector gas path semi-circular seam. The ejector cover plate is placed on top of the sprue seat brick. The left half of the ejector cover plate is fitted onto the sprue seat brick through a rounded corner connecting structure. The right half of the ejector cover plate is fitted onto the sprue seat brick through a stepped connecting structure. The lower right half of the ejector cover plate is located between itself and the sprue seat brick, forming the ejector gas impact zone. An ejector gas path is provided inside the seat brick. The ejector gas path is connected to one end of the ejector gas path semi-circular seam, and the ejector gas impact zone is connected to the other end of the ejector gas path semi-circular seam.

2. The steel ladle pouring and diversion device according to claim 1, characterized in that, The stepped connection structure is located on the lower right half of the ejection cover plate. The bottom step width f of the stepped connection structure is smaller than the top step width k of the stepped connection structure, and the bottom step height d of the stepped connection structure is smaller than the thickness h of the ejection cover plate. The bottom step width f of the ejection cover plate (1) is 5-20 mm, the top step width k of the ejection cover plate (1) is 7-25 mm, the thickness h of the ejection cover plate (1) is 10-50 mm, and the bottom step height d of the ejection cover plate (1) is 1-10 mm.

3. The steel ladle pouring and diversion device according to claim 1, characterized in that, The rounded corner connection structure is located on the lower edge of the left half of the ejection cover plate, and a horizontal fitting gap is provided between the left half of the ejection cover plate and the seat brick sleeve; the range of the horizontal fitting gap m is 0 to 0.8 mm.

4. A steel ladle pouring and diversion device according to claim 1, characterized in that, The ejection cover plate has a pre-embedded ejection cover plate cavity inside.

5. A steel ladle pouring and diversion device according to claim 1, characterized in that, The ejection cover is disc-shaped.

6. A steel ladle pouring and diversion device according to claim 1, characterized in that, The upper surface of the ejection cover plate and the upper surface of the seat brick sleeve are on the same horizontal plane.

7. The apparatus according to any one of claims 1-6 implements a method for diverting water during steel ladle pouring, characterized in that, include: S1. The ejector cover is baked together with the molten steel ladle, then filled with molten steel and placed in the pouring position; S2. Connect the ejection gas path to the high-pressure argon gas source and open the slide plate; S3. Open the control valve of the high-pressure argon gas source to the fully open state. The high-pressure argon gas enters the ejection gas impact zone through the ejection gas path and the semi-circular gap of the ejection gas path. The bottom surface of the ejection cover plate is ejected to the upper left by the high pressure. S4. As the ejector cover is ejected into the molten steel, it is buoyed by the molten steel and floats up to the surface. S5. Molten steel flows out from the nozzle seat brick and slide plate, and pouring begins; S6. Reduce the opening of the control valve connecting the high-pressure argon gas source to the ejection gas path to maintain the gas flow rate so that the semi-circular seam of the ejection gas path is not blocked by molten steel until the casting is completed. S7. Install new ejection covers during the preparation of the molten steel ladle.

Images