Ladle lining structure capable of reducing pouring residual steel

Abstract

The utility model relates to a steel ladle lining structure capable of reducing pouring residual steel. The steel ladle lining structure comprises a steel ladle shell, a heat preservation layer, a ladle bottom permanent layer, a ladle wall permanent layer, a working layer and an impact layer. The ladle bottom permanent layer is arranged on the upper portion of the inner bottom of the ladle shell, and the heat preservation layer, the ladle wall permanent layer and the working layer are sequentially arranged on the side wall, located on the upper portion of the ladle bottom permanent layer, of the ladle shell. The impact layer is arranged on the upper portion of the ladle bottom permanent layer, and the side wall of the impact layer makes contact with the working layer. And the height of the impact layer is gradually reduced in a stepped manner from the impact area to the water gap area. The height of the impact layer is gradually reduced in a stepped manner from the impact area to the nozzle area, so that a height difference is generated, the phenomenon of residual steel of the steel ladle caused by insufficient fall between the ladle bottom impact pit and the ladle bottom nozzle area is perfectly solved, and the problem of residual steel of the ladle bottom in a steel mill can be well avoided. The impact layer is made of magnesium-aluminum-carbon bricks, spinel can be formed in the high-temperature using process, and expansion is kept.

Description

Technical Field

[0001] The utility model belongs to the technical field of steelmaking equipment, and in particular relates to a ladle lining structure for reducing excess steel during casting. Background Art

[0002] At present, the bottom of the ladle used in steel mills is generally a flat bottom. There is no height difference between the impact area of ​​the ladle bottom and the water inlet area, which makes it inconvenient for the molten steel to flow to the water inlet area. In addition, the impact part of the ladle bottom erodes faster than other parts to form impact pits, which further aggravates the phenomenon that the molten steel cannot be poured cleanly into the ladle, resulting in a large amount of leftover steel, causing huge losses to the consumption of steel materials and the comprehensive cost of steelmaking, and has become a common problem in the ladle preparation process of steel mills. Utility Model Content

[0003] The utility model aims to provide a ladle lining structure for reducing excess steel during casting, so as to solve the technical problems raised in the background technology.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A ladle lining structure for reducing excess steel during casting, comprising: a ladle shell, an insulation layer, a ladle bottom permanent layer, a ladle wall permanent layer, a working layer and an impact layer;

[0006] The ladle bottom permanent layer is arranged on the upper part of the inner bottom of the ladle shell, and the insulation layer, the ladle wall permanent layer and the working layer are arranged in sequence on the side wall of the ladle shell located above the ladle bottom permanent layer; the impact layer is arranged on the upper part of the ladle bottom permanent layer and the side wall of the impact layer is in contact with the working layer; the height of the impact layer decreases in a step-like manner from the impact zone to the water inlet zone.

[0007] As a further improvement of the utility model, the impact layer includes high-position bricks, middle-position bricks and low-position bricks; the high-position bricks are located in the impact zone, and their height is 400 mm, the middle-position bricks are located between the high-position bricks and the low-position bricks, and their height is 350 mm, and the low-position bricks are located in the water outlet zone, and their height is 300 mm.

[0008] As a further improvement of the present invention, the impact layer is made of magnesium-aluminum-carbon bricks.

[0009] As a further improvement of the utility model, the working layer includes a ladle slag line layer and a ladle wall working layer arranged below the ladle slag line layer.

[0010] As a further improvement of the utility model, a brick pressing flange is provided on the upper part of the working layer, and a casting material is poured in the gap between the brick pressing flange and the working layer.

[0011] The beneficial effects of adopting the above technical solution are:

[0012] The height of the impact layer of the utility model decreases in a step-like manner from the impact area to the water inlet area, resulting in a height difference, which perfectly solves the problem of steel leftover in the ladle caused by insufficient height difference between the impact pit at the bottom of the ladle and the water inlet area at the bottom of the ladle, and can effectively eliminate the problem of steel leftover at the bottom of the ladle in steel plants. The material of the impact layer is selected from magnesium-aluminum-carbon bricks, which will form spinel during high-temperature use, maintain permanent micro-expansion, and further improve the strength of the impact layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Markings in the figure: 1 ladle shell, 2 insulation layer, 3 ladle bottom permanent layer, 4 ladle wall permanent layer, 5 impact layer, 6 high-position bricks, 7 middle-position bricks, 8 low-position bricks, 9 ladle slag line layer, 10 ladle wall working layer, 11 press brick flange, 12 castable, 13 air bricks, 14 nozzle seat bricks. DETAILED DESCRIPTION

[0015] In order to better understand the purpose, structure and function of the present invention, the present invention is described clearly and completely below in conjunction with the accompanying drawings.

[0016] like Figure 1 The ladle lining structure for reducing excess steel during pouring shown in the figure comprises: a ladle shell 1, an insulation layer 2, a ladle bottom permanent layer 3, a ladle wall permanent layer 4, a working layer and an impact layer 5; the bottom of the ladle shell 1 is welded with legs, and a drag seat is provided on the side wall. The ladle bottom permanent layer 3 is provided on the upper part of the inner bottom of the ladle shell 1, and the ladle bottom permanent layer 3 is made of a sleeve mold casting material 12. The ladle bottom permanent layer 3 is provided with a breathable brick 13 and a nozzle seat brick 14, and the joints between the breathable brick 13, the nozzle seat brick 14 and the ladle bottom permanent layer 3 are made of corundum casting material, which has a continuous micro-expansion performance at high temperature, avoids steel seepage from the joints, and prevents steel leakage accidents; at the same time, the corrosion resistance of the material protects the seat bricks, which can extend the service life of the seat bricks.

[0017] The insulation layer 2, the wall permanent layer 4 and the working layer are sequentially arranged on the side wall of the ladle shell 1 located on the upper part of the ladle bottom permanent layer 3. In this embodiment, the insulation layer 2 is made of nanofiber board; the working layer includes a ladle slag line layer 9 and a wall working layer 10 arranged below the ladle slag line layer 9. The width of the bricks used in the ladle slag line layer 9 is greater than the width of the rotating head used on the wall working layer 10. The ladle slag line layer 9 is bricks No. 28-40 in the figure, and the wall working layer 10 is bricks No. 1-27. In addition, a brick pressing flange 11 is provided on the upper part of the working layer, and a castable 12 is poured in the gap between the brick pressing flange 11 and the working layer. The brick pressing flange 11 has a good deposit effect on the working layer bricks below, which can avoid the problem of slag hanging during operation and cause the lining working layer bricks to fall off, thereby extending the service life of the ladle.

[0018] The impact layer 5 is arranged on the upper part of the bottom permanent layer 3 and the side wall of the impact layer 5 is in contact with the working layer; the height of the impact layer 5 decreases in a step-like manner from the impact zone to the nozzle zone. Specifically, the impact layer 5 includes a high-position brick 6, a middle-position brick 7 and a low-position brick 8; the high-position brick 6 is located in the impact zone, and its height is 400mm, the middle-position brick 7 is located between the high-position brick 6 and the low-position brick 8, and its height is 350mm, the low-position brick 8 is located in the nozzle zone, and its height is 300mm, and the length and width of the high-position brick 6, the low-position brick 8, and the middle-position brick 7 are all 150×100mm; and the material of the impact layer 5 is a magnesium-aluminum-carbon brick, which will form spinel during high-temperature use, maintain permanent micro-expansion, and further improve strength.

[0019] The effect of using the ladle lining structure to reduce the leftover steel after pouring is shown in Table 1. Before the implementation, the average monthly leftover steel at the bottom of the ladle in a steel plant was 2462.52 tons, equivalent to about 82.08 tons per day. After the implementation, the average monthly leftover steel at the bottom of the ladle was reduced to 543.6 tons, about 18.2 tons per day, a decrease of 77.93%. The monthly production capacity is about 800,000 tons, which can reduce the cost of a ton of steel by about 7.2 yuan.

[0020] Table 1

[0021] contrast Monthly large steel quantity (tons) Average daily volume (tons) Before implementation 2462.52 82.08 After implementation 543.6 18.12

[0022] In addition, the bricks in each layer are connected by magnesia fireclay, which is made of high-grade fused magnesium and is finely mixed with composite admixtures and binders. The fireclay has high bonding strength, small mortar joints during masonry, and the masonry lining has overall structural strength. At the same time, the refractory mud will form a certain amount of spinel during use, and produce very small micro-expansion, and the strength gradually increases. The refractory mud has the same anti-corrosion and anti-permeability properties as the ladle working lining. The material is easy to construct and is packed in dry powder bags for easy storage.

[0023] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A ladle lining structure for reducing excess steel during casting, characterized in that: It includes: Ladle shell (1), insulation layer (2), ladle bottom permanent layer (3), ladle wall permanent layer (4), working layer and impact layer (5); The ladle bottom permanent layer (3) is arranged on the upper part of the inner bottom of the ladle shell (1), and the insulation layer (2), the ladle wall permanent layer (4) and the working layer are arranged in sequence on the side wall of the ladle shell (1) located above the ladle bottom permanent layer (3); the impact layer (5) is arranged on the upper part of the ladle bottom permanent layer (3) and the side wall of the impact layer (5) is in contact with the working layer; the height of the impact layer (5) decreases in a step-like manner from the impact zone to the water inlet zone.

2. A ladle lining structure for reducing excess steel during casting according to claim 1, characterized in that: The impact layer (5) comprises high-position bricks (6), middle-position bricks (7) and low-position bricks (8); the high-position bricks (6) are located in the impact zone, with a height of 400 mm, the middle-position bricks (7) are located between the high-position bricks (6) and the low-position bricks (8), with a height of 350 mm, and the low-position bricks (8) are located in the water inlet zone, with a height of 300 mm.

3. The ladle lining structure for reducing excess steel during casting according to claim 1, characterized in that: The impact layer (5) is made of magnesium-aluminum-carbon bricks.

4. The ladle lining structure for reducing excess steel during casting according to claim 1, characterized in that: The working layer comprises a ladle slag line layer (9) and a ladle wall working layer (10) arranged below the ladle slag line layer (9).

5. The ladle lining structure for reducing excess steel during casting according to claim 1, characterized in that: A brick pressing flange (11) is provided on the upper part of the working layer, and a casting material (12) is poured in the gap between the brick pressing flange (11) and the working layer.

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