Construction structure of hot-metal bottle mouth castable

Abstract

The utility model relates to the technical field of iron and steel smelting molten iron bearing and transferring, in particular to a construction structure of molten iron tank opening castable, which comprises a tank shell, a permanent lining and a working lining. Basic lining bricks and supporting lining bricks are built on the uppermost layer of the working lining, the supporting lining bricks are evenly distributed between the basic lining bricks in the circumferential direction, the supporting lining bricks are longer than the basic lining bricks, and weights are arranged at the upper ends of the supporting lining bricks and welded to the inner wall of the tank shell; the lower edge of the tank opening castable mold is supported on the position, protruding out of the length of the foundation lining brick, of the supporting lining brick. According to the utility model, the masonry mode of the uppermost layer of lining bricks is improved, and a small platform formed by a mold and the lining bricks is eliminated, so that the direct damage of a drill rod head to the lining bricks during the slag removal operation of a dismantling machine is eliminated. Meanwhile, the brick type design of the uppermost layer of lining bricks is improved, the probability that molten iron enters the lining bricks and the permanent lining through gaps between the castable and the lining bricks is reduced, and the safety risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of molten iron loading and transfer technology in iron smelting, and in particular to a construction structure for molten iron ladle casting refractory. Background Technology

[0002] The spitting area at the mouth of a molten iron ladle is typically constructed using either brickwork or castable refractory. Brickwork offers better resistance to corrosion and thermal shock, requires less baking time, and allows for convenient local replacement at lower costs. However, it suffers from numerous seams and poor overall integrity, potentially leading to increased maintenance frequency. In particular, when slag buildup is severe, the spitting area is more susceptible to damage during slag removal operations.

[0003] After application, castable refractory forms a seamless whole, reducing weak points at joints and improving structural strength and sealing. It exhibits excellent performance in terms of integrity and thermal shock resistance, and its construction is flexible and fast, although molds are required. In situations where severe slag buildup necessitates frequent cleaning, the excellent integrity and convenient construction method of castable refractory make it superior to bricklaying, leading to its widespread use.

[0004] In actual use, if the molten iron has a high vanadium-titanium content or a high sulfur content, the molten iron pretreatment intensity is relatively high, resulting in a large amount of residue. This residue has high viscosity and is quite hard when it adheres to the chute. When the residue accumulates to a certain extent at the chute, it must be cleaned to ensure the normal operation of the molten iron ladle tilting operation.

[0005] In a steel plant, the chute spout of a molten iron ladle was constructed using low-cement castable. During construction, a mold was installed, which needed to be placed on top of the uppermost working lining brick 2. After demolding, a platform 4 of 30-50mm appeared between the working lining brick 2 and the ladle spout castable 1. Due to this platform 4, slag 5 accumulated more easily, resulting in a thicker slag layer. When using a demolition machine for slag removal, the demolition machine's chisel 3 easily struck the platform 4, causing damage to the working lining brick 2, leading to breakage and fracture. See details. Figure 1 .

[0006] In addition, due to the different thermal changes of the two materials at the joint between the castable and the lining brick, molten iron can easily seep in from the joint and enter between the lining brick and the permanent lining, affecting safe production and service life. Utility Model Content

[0007] The purpose of this invention is to provide a construction structure for molten iron ladle lining. By improving the construction method of the top layer of lining bricks, the small platform formed by the mold and the lining bricks is eliminated, thereby eliminating direct damage to the lining bricks by the chisel tip during slag removal operations. Simultaneously, the improved brick shape design of the top layer of lining bricks reduces the probability of molten iron entering the lining bricks and permanent lining through the gaps between the lining and the lining bricks, thus reducing safety risks.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A construction structure for a molten iron ladle mouth castable includes a ladle shell, a permanent lining, and a working lining. The uppermost layer of the working lining is constructed with two types of lining bricks: a foundation lining brick and a supporting lining brick. The supporting lining bricks are evenly distributed circumferentially among the foundation lining bricks. The supporting lining bricks are longer than the foundation lining bricks, and a pressure iron is provided at the upper end of the supporting lining brick. The pressure iron is welded and fixed to the inner wall of the ladle shell. The lower edge of the ladle mouth castable mold is supported at a position where the supporting lining brick protrudes beyond the length of the foundation lining brick.

[0010] The upper surface of the foundation lining bricks is provided with grooves.

[0011] The groove has a depth of 45-55 mm and a width of 45-55 mm.

[0012] The supporting lining bricks are 30-40 mm longer than the base lining bricks.

[0013] The supporting lining bricks consist of 12 to 14 pieces.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model reduces the thickness of residue accumulation at the interface between the castable and the lining brick. Since the residue is parallel to the inner wall of the refractory working surface, it reduces the difficulty of cleaning the residue with the demolition machine and improves work efficiency.

[0016] 2. This utility model adopts a new construction method, which reduces the risk of damage to the lining bricks by the chisel when the demolition machine cleans up the residue, and reduces the probability of lining brick damage and cracks.

[0017] 3. The concave groove design of the lining brick in this utility model reduces the probability of molten iron entering the space between the permanent lining and the lining brick through the joint between the lining brick and the ladle mouth castable, thereby improving the safety factor of the molten iron ladle operation and reducing the number of slag line maintenance times. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of existing technology for cleaning residues accumulated at the interface between the castable and the lining brick.

[0019] Figure 2 This is a schematic diagram of the brick type of the basic lining brick of this utility model.

[0020] Figure 3 yes Figure 2 Side view.

[0021] Figure 4 This is a top view of the molten iron ladle opening in the construction structure of this utility model.

[0022] Figure 5 This is a schematic diagram of the installation of the casting mold at the tank opening in the construction structure of this utility model.

[0023] In the diagram: 1. Tank opening castable; 2. Working lining brick; 3. Removal chisel; 4. Platform; 5. Residue; 6. Foundation lining brick; 7. Tank shell; 8. Permanent lining; 9. Groove; 10. Press iron; 11. Supporting lining brick; 12. Tank opening castable mold. Detailed Implementation

[0024] The specific embodiments of this utility model are further described below:

[0025] like Figures 2-5 As shown: A construction structure for a molten iron ladle mouth casting refractory includes a ladle shell 7, a permanent lining 8, and a working lining 13; the uppermost layer of the working lining is constructed with two types of lining bricks: a foundation lining brick 6 and a support lining brick 11. The support lining brick 11 is evenly distributed among the foundation lining bricks 6 in the circumferential direction. The support lining brick 11 is longer than the foundation lining brick 6, and a pressure iron 10 is provided at the upper end of the support lining brick 11. The pressure iron 10 is welded and fixed to the inner wall of the ladle shell 7. The lower edge of the ladle mouth casting refractory mold 12 is supported at the position where the support lining brick 11 protrudes beyond the length of the foundation lining brick 6.

[0026] The upper surface of the base lining brick 6 is provided with a groove 9.

[0027] The groove 9 has a depth of 45-55 mm and a width of 45-55 mm.

[0028] The supporting lining brick 11 is 30-40 mm longer than the base lining brick 6.

[0029] The supporting lining bricks 11 consist of 12 to 14 pieces.

[0030] The construction method for the refractory structure at the ladle opening includes the following steps:

[0031] 1) When laying the top layer of working lining bricks, the base lining bricks 6 with grooves 9 are laid in a ring on the working lining, and the supporting lining bricks 11 are evenly distributed in the circumferential direction between the base lining bricks 6.

[0032] 2) All the grooves 9 of the base lining brick 6 face upwards, forming an annular groove at the upper end of the working lining;

[0033] 3) Weld the pressure iron 10 to the upper end of the support lining brick 11 to press down the support lining brick 11;

[0034] 4) Support the lower edge of the casting mold 12 at the mouth of the tank on the support lining brick 11 at the position where it protrudes beyond the length of the base lining brick 6;

[0035] 5) Complete the pouring of the refractory material at the tank opening.

[0036] Example:

[0037] The top ring of bricks in the working lining of the molten iron ladle is constructed using grooved base lining bricks 6. The height of the base lining bricks 6 is slightly higher than that of the permanent lining. The supporting lining bricks 11, which support the casting mold 12 at the ladle opening, are 30mm longer than the normal base lining bricks 6, and have the same taper as the base lining bricks 6. The supporting lining bricks 11 do not have grooves 9. A pressure iron 10 is welded to the inner wall of the molten iron ladle to hold down the supporting lining bricks 11.

[0038] The lower edge of the casting mold 12 is supported by the protruding part of the supporting lining brick 11 (extending 30mm), so that the surface of the mold and the inner wall of the base lining brick 6 are basically on the same plane. Check whether there are large gaps between the mold and the lining brick, make appropriate adjustments, and ensure the mold is installed and fixed.

[0039] During the construction of the castable refractory, ensure its good workability by using a vibrator to compact it and ensure full contact between the castable refractory and the lining bricks, leaving no gaps.

[0040] After the castable has cured and been demolded, check whether the castable and the inner wall of the foundation lining brick 6 are basically on the same plane. If there is any slight unevenness, it can be smoothed with a coating material.

[0041] This invention improves the construction method of the top layer of lining bricks, eliminating the small platform formed by the mold and the lining bricks, thereby eliminating direct damage to the lining bricks from the chisel tip during slag removal operations. Preferably, in this embodiment, 12 supporting lining bricks 11 are evenly distributed and constructed, each 30mm longer than the normal base lining bricks 6 in the radial direction of the molten iron ladle. This allows the ladle mouth casting mold 12 to sit on the protruding part of the supporting lining bricks 11, with the surface of the ladle mouth casting mold 12 flush with the outer wall of the normally constructed base lining bricks 6. This prevents a noticeable platform after demolding. This reduces the thickness of the slag buildup in this area and prevents the demolition machine chisel 3 from directly hitting the lining bricks during slag removal, reducing cracking and damage. To prevent displacement of the supporting lining bricks 11 under the weight of the ladle mouth casting mold 12, a pressure iron 10 is added to the supporting lining bricks 11.

[0042] This utility model also improves the brick shape design of the top working lining brick. A groove is designed on the upper surface of the lining brick at the contact part with the castable, thereby reducing the probability of molten iron seeping in. A 50*50mm groove 9 is designed on the upper surface of the base lining brick 6. The original flat contact between the castable and the lining brick is changed to a curved contact, thereby reducing the probability of molten iron entering the working lining brick and permanent lining through the gap between the castable and the lining brick, and reducing safety risks.

Claims

1. A construction structure for a molten iron ladle spout castable, comprising a ladle shell, a permanent lining, and a working lining; characterized in that, The uppermost layer of the working lining consists of two types of lining bricks: a base lining brick and a support lining brick. The support lining bricks are evenly distributed between the base lining bricks in the circumferential direction. The support lining bricks are longer than the base lining bricks, and a pressure iron is provided at the upper end of the support lining brick. The pressure iron is welded and fixed to the inner wall of the tank shell. The lower edge of the casting mold at the tank opening is supported at the position where the support lining brick protrudes beyond the length of the base lining brick.

2. The construction structure of the molten iron ladle spout castable according to claim 1, characterized in that, The upper surface of the foundation lining bricks is provided with grooves.

3. The construction structure of the molten iron ladle spout castable according to claim 2, characterized in that, The groove has a depth of 45-55 mm and a width of 45-55 mm.

4. The construction structure of the refractory for molten iron ladle opening according to claim 1, characterized in that, The supporting lining bricks are 30-40 mm longer than the base lining bricks.

5. The construction structure of the refractory for molten iron ladle opening according to claim 1, characterized in that, The supporting lining bricks consist of 12 to 14 pieces.

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