Construction structure and method for hot-metal bottle mouth castable

Abstract

The invention relates to the technical field of iron and steel smelting molten iron bearing and transferring, in particular to a construction structure and method for a molten iron tank opening castable, and the construction structure 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. By improving the masonry mode of the uppermost layer of lining bricks, a small platform formed by a mold and the lining bricks is eliminated, so that direct damage of a drill rod head to the lining bricks during 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] The present invention relates to the technical field of molten iron loading and transportation in iron and steel smelting, and particularly relates to a construction structure and method for gunning mix at the molten iron ladle mouth. Background Art

[0002] Generally, the positions of the large and small spouts at the molten iron ladle mouth are lined with bricks or cast with gunning mix. The brick-lining method shows good performance in terms of erosion resistance and thermal shock resistance, has a short baking time, is convenient for local replacement, and has a low cost. However, it has problems such as many joints and poor integrity, which may lead to an increase in maintenance frequency. Especially in the case of serious slag hanging, it is easier to cause damage to the spout position of the ladle during slag cleaning operations.

[0003] After the gunning mix is constructed, it forms a seamless whole, reducing the weak points at the joints, improving the structural strength and sealing performance, showing excellent performance in terms of integrity and thermal shock resistance, and being flexible and fast in construction. However, molds need to be prepared. In the case of serious slag hanging and frequent slag cleaning, due to the good integrity and convenient construction method of the gunning mix, the use effect is better than that of brick-lining, so it is widely used.

[0004] In the actual use of molten iron ladles, if the vanadium and titanium content in the molten iron is high, or the sulfur content in the molten iron is high, the intensity of molten iron pretreatment is relatively large, generating a large amount of slag. This slag has a high viscosity and a relatively large hardness when hanging on the spout part. When the slag accumulates to a certain extent at the spout part, slag cleaning treatment must be carried out to ensure the normal operation of the molten iron pouring operation of the molten iron ladle.

[0005] At a certain steel plant, the spout position of the molten iron ladle is cast with low-cement gunning mix. When constructing, a mold needs to be installed, and the mold needs to be pressed on the top layer of the working lining brick 2. After demolding, a platform 4 with a height of 30 - 50 mm appears between the working lining brick 2 and the gunning mix 1 at the ladle mouth. Due to the presence of the platform 4, the slag 5 is more likely to accumulate, and the slag layer is relatively thick. When using a demolition machine for slag cleaning operations, the demolition machine drill 3 is likely to hit the brick surface platform 4 during slag cleaning, resulting in damage to the working lining brick 2, such as fracture and breakage. See Figure 1 .

[0006] In addition, due to the different thermal expansions of the two materials at the joint position between the gunning mix and the lining brick, molten iron is likely to seep in from the joint, enter between the lining brick and the permanent lining, affecting safety production and service life. Summary of the Invention

[0007] The purpose of the present invention is to provide a construction structure and method for gunning mix at the molten iron ladle mouth. By improving the masonry method of the top layer of the lining brick, the small platform formed by the mold and the lining brick is eliminated, thereby eliminating the direct damage of the drill head to the lining brick during the slag cleaning operation of the demolition machine. At the same time, by improving the brick type design of the top layer of the lining brick, the probability of molten iron entering between the lining brick and the permanent lining through the gap between the gunning mix and the lining brick is reduced, and the safety risk is lowered.

[0008] To achieve the above object, the present invention is implemented by the following technical solutions:

[0009] A construction structure of a casting material for a hot metal ladle mouth, comprising a ladle shell, a permanent lining, and a working lining; two types of lining bricks, namely a base lining brick and a support lining brick, are laid on the uppermost layer of the working lining. The support lining bricks are evenly distributed in the circumferential direction between the base lining bricks. The support lining bricks are longer than the base lining bricks, and a pressing iron is provided at the upper end of the support lining bricks. The pressing iron is fixedly welded to the inner wall of the ladle shell, and the lower edge of the casting material mold for the ladle mouth is supported at the position where the support lining bricks protrude from the base lining bricks.

[0010] A groove is provided on the upper surface of the base lining brick.

[0011] The depth of the groove is 45 - 55 mm, and the width of the groove is 45 - 55 mm.

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

[0013] The number of the support lining bricks is 12 - 14.

[0014] A construction method for the construction structure of the casting material for the hot metal ladle mouth includes the following method steps:

[0015] 1) When laying the uppermost layer of the working lining bricks, the base lining bricks with grooves are laid in a ring on the working lining, and the support lining bricks are evenly distributed in the circumferential direction between the base lining bricks.

[0016] 2) All the grooves of the base lining bricks face upward to form a ring-shaped concave groove at the upper end of the working lining.

[0017] 3) Weld the pressing iron to the upper end of the support lining bricks to press the support lining bricks.

[0018] 4) Support the lower edge of the casting material mold for the ladle mouth at the position where the support lining bricks protrude from the base lining bricks.

[0019] 5) Complete the casting construction of the casting material for the ladle mouth.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. The present invention reduces the thickness of the residue accumulated at the interface between the casting material and the lining bricks. Since the residue is parallel to the inner wall of the refractory working surface, the difficulty of cleaning the residue by the demolition machine is reduced, and the work efficiency is improved.

[0022] 2. The present invention adopts a new construction method, reducing the risk of damage to the lining bricks by the drill rod during the cleaning of the residue by the demolition machine, and reducing the probability of lining brick breakage and cracking.

[0023] 3. The design of the concave groove in the lining brick of the present invention reduces the probability of molten iron entering between the permanent lining and the lining brick through the joint between the lining brick and the casting material at the ladle opening, improves the safety factor of the molten iron ladle during operation, and reduces the number of slag line maintenance times. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the prior art for cleaning the residue accumulated at the interface between the casting material and the lining brick.

[0025] Figure 2 is a schematic diagram of the brick shape of the basic lining brick of the present invention.

[0026] Figure 3 is Figure 2 a side view.

[0027] Figure 4 is a top view of the molten iron ladle opening in the construction structure of the present invention.

[0028] Figure 5 is an installation schematic diagram of the casting material mold at the ladle opening in the construction structure of the present invention.

[0029] In the figure: 1. Casting material at the ladle opening; 2. Working lining brick; 3. Demolition machine drill rod; 4. Platform; 5. Residue; 6. Basic lining brick; 7. Ladle shell; 8. Permanent lining; 9. Groove; 10. Pressing iron; 11. Supporting lining brick; 12. Casting material mold at the ladle opening. DETAILED DESCRIPTION OF THE INVENTION

[0030] The following further describes the specific embodiments of the present invention:

[0031] As Figures 2-5 shown: A construction structure of a casting material at the molten iron ladle opening includes a ladle shell 7, a permanent lining 8, and a working lining 13; two types of lining bricks, namely a basic lining brick 6 and a supporting lining brick 11, are laid on the top layer of the working lining. The supporting lining bricks 11 are evenly distributed in the circumferential direction between the basic lining bricks 6. The supporting lining bricks 11 are longer than the basic lining bricks 6, and a pressing iron 10 is provided at the upper end of the supporting lining bricks 11. The pressing iron 10 is welded and fixed to the inner wall of the ladle shell 7. The lower edge of the casting material mold 12 at the ladle opening is supported at the position where the supporting lining bricks 11 protrude beyond the basic lining bricks 6.

[0032] A groove 9 is provided on the upper surface of the basic lining brick 6.

[0033] The depth of the groove 9 is 45 - 55 mm, and the width of the groove 9 is 45 - 55 mm.

[0034] The supporting lining bricks 11 are 30 - 40 mm longer than the basic lining bricks 6.

[0035] The number of the supporting lining bricks 11 is 12 - 14.

[0036] Construction method of the construction structure of the casting material for the molten iron ladle mouth, including the following method steps:

[0037] 1) When laying the bricks of the topmost layer of the working lining, the basic lining bricks 6 with grooves 9 are laid annularly in the working lining, and the supporting lining bricks 11 are evenly distributed in the circumferential direction between the basic lining bricks 6.

[0038] 2) All the grooves 9 of the basic lining bricks 6 face upward to form an annular concave groove at the upper end of the working lining.

[0039] 3) The pressing iron 10 is welded to the upper end of the supporting lining brick 11 to press down the supporting lining brick 11.

[0040] 4) The lower edge of the ladle mouth casting material mold 12 is supported at the position where the supporting lining brick 11 protrudes from the basic lining brick 6.

[0041] 5) Complete the casting construction of the ladle mouth casting material.

[0042] Example:

[0043] Lay the topmost ring of bricks of the working lining of the molten iron ladle, using the basic lining bricks 6 with grooves for laying. The laying height of the basic lining bricks 6 is slightly higher than that of the permanent lining. The supporting lining bricks 11 for supporting the ladle mouth casting material mold 12 are 30 mm longer than the normal basic lining bricks 6, and the taper is the same as that of the basic lining bricks 6. The supporting lining bricks 11 do not have grooves 9. Weld the pressing iron 10 on the inner wall of the molten iron ladle to press down the supporting lining bricks 11.

[0044] The lower edge of the ladle mouth casting material mold 12 is supported at the protruding position (the extra 30 mm) of the supporting lining brick 11, so that the surface of the mold is basically in the same plane as the inner wall of the basic lining brick 6. Check whether there are large gaps between the mold and the bricks, make appropriate adjustments, and complete the installation and fixation of the mold.

[0045] For the construction of the casting material, ensure good construction performance of the casting material, vibrate it with a vibrating rod to ensure full contact between the casting material and the bricks without leaving gaps.

[0046] After the casting material cures and is demolded, check whether the inner wall of the casting material and the basic lining brick 6 are basically in the same plane. If it is slightly uneven, it can be leveled with the coating material.

[0047] The present invention improves the masonry method of the top layer of lining bricks, eliminates the small platform formed by the mold and the lining bricks, thereby eliminating the direct damage to the lining bricks by the drill bit during the slag cleaning operation of the dismantling machine. Preferably, in the embodiment, 12 support lining bricks 11 are evenly distributed for masonry, which are 30 mm longer than the normal basic lining bricks 6 in the radial direction of the hot metal ladle. In this way, the mold 12 for the pouring material at the ladle opening can sit on the protruding part of the support lining bricks 11, and the surface of the mold 12 for the pouring material at the ladle opening is in the same plane as the outer wall of the normally masoned basic lining bricks 6. In this way, after demoulding, no obvious platform will be generated. One is to reduce the thickness of slag formation at this part, and the other is to avoid the direct impact of the drill 3 of the dismantling machine on the lining bricks during the slag cleaning of the dismantling machine, reducing the cracks and breakages of the lining bricks. In order to prevent the support lining bricks 11 from shifting under the gravity of the mold 12 for the pouring material at the ladle opening, iron weights 10 are added on the support lining bricks 11.

[0048] The present invention also improves the brick type design of the top layer of working lining bricks. Concave grooves are designed on the upper surface of the lining bricks in contact with the pouring material, thereby reducing the probability of molten iron infiltration. A groove 9 with a size of 50*50 mm is designed on the upper surface of the basic lining bricks 6. The original flat contact between the pouring material and the lining bricks is changed to a curve contact, thereby reducing the probability of molten iron entering the working lining bricks and the permanent lining through the gap between the pouring material and the lining bricks, reducing the safety risk.

Claims

1. The construction structure of a hot metal ladle mouth casting material, comprising a ladle shell, a permanent lining, and a working lining; characterized in that, The uppermost layer of the working lining is built with two types of lining bricks, namely, basic lining bricks and supporting lining bricks. The supporting lining bricks are evenly distributed in the circumferential direction between the basic lining bricks. The supporting lining bricks are longer than the basic lining bricks, and a pressing iron is provided at the upper end of the supporting lining bricks. The pressing iron is welded and fixed to the inner wall of the tank shell. The lower edge of the tank mouth castable mold is supported at the position where the supporting lining bricks protrude beyond the basic lining bricks in length.

2. The construction structure of a hot metal ladle mouth casting material according to claim 1, characterized in that, The upper surface of the basic lining bricks is provided with grooves.

3. The construction structure of a hot metal ladle mouth casting material according to claim 2, characterized in that, The depth of the grooves is 45 - 55 mm, and the width of the grooves is 45 - 55 mm.

4. The construction structure of a hot metal ladle mouth casting material according to claim 1, characterized in that, The supporting lining bricks are 30 - 40 mm longer than the basic lining bricks.

5. The construction structure of a hot metal ladle mouth casting material according to claim 1, characterized in that, The number of the supporting lining bricks is 12 - 14.

6. A construction method of a construction structure of a pouring material for a hot metal ladle mouth as described in any one of claims 1 - 5, characterized in that, It includes the following method steps: 1) When building the uppermost layer of the working lining bricks, the basic lining bricks with grooves are built in a ring in the working lining, and the supporting lining bricks are evenly distributed in the circumferential direction between the basic lining bricks; 2) All the grooves of the basic lining bricks face upward to form an annular concave groove at the upper end of the working lining; 3) The pressing iron is welded to the upper end of the supporting lining bricks to press the supporting lining bricks; 4) The lower edge of the tank mouth castable mold is supported at the position where the supporting lining bricks protrude beyond the basic lining bricks in length; 5) Complete the pouring construction of the tank mouth castable.

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