Lining method for blast furnace trough precast blocks in repairing blast furnace troughs, and blast furnace trough lining structure

Abstract

To provide a novel method capable of lining a precast block as a wear lining in a short time in repairing a blast furnace gutter.SOLUTION: A lining method for a blast furnace gutter precast block in repairing the blast furnace gutter includes: removing at least a part of wear lining to expose permanent lining; installing the blast furnace gutter precast block on an exposed surface of the permanent lining through a support so as to create a gap between the permanent lining and the blast furnace gutter precast block; and filling at least a part of the gap with a pouring material.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present application discloses a lining method for a blast furnace runner precast block in blast furnace runner repair, and a blast furnace runner lining structure. [Background technology]

[0002] Precast blocks are used as linings for blast furnace runners. Patent Document 1, for example, discloses a technique for shortening the construction period of a blast furnace runner by integrating concrete blocks, fireproof insulation, and refractory material (wear lining) before the construction of the blast furnace casthouse. Patent Document 2 discloses a technique for extending the life of a blast furnace runner by lining the side walls of the runner with precast blocks. Patent Documents 3 and 4 disclose techniques for constructing groove-shaped molten metal passages for molten pig iron runners and slag runners using precast blocks, including techniques for preventing melting damage to the joints by forming obtuse angles when placing the precast blocks. Patent Document 5 discloses a technique for efficiently lining a blast furnace runner by suspending the precast blocks when installing them in the runner and filling the gaps between the blocks and the inner surface of the runner with a cast material. Furthermore, Patent Document 6 discloses a technology for preventing cracks that occur in the refractory lining, which is the main cause of iron leakage accidents, from reaching the steel shell by using a precast block with at least a three-layer structure as the back material in a blast furnace runner having a wear material and a back material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-323865 [Patent Document 2] Japanese Patent Application Publication No. 59-185710 [Patent Document 3] Patent No. 6057653 [Patent Document 4] Patent No. 6057654 [Patent Document 5] Japanese Patent Application Publication No. 59-143006 [Patent Document 6] Japanese Patent Application Laid-Open No. 2011-219806 Summary of the Invention [Problem to be solved by the invention]

[0004] Precast blocks have superior damage resistance and other properties compared to conventional frame-cast linings. For example, using precast blocks as a wear lining for a blast furnace runner tends to extend the life of the blast furnace runner. Due to these advantages, precast blocks are sometimes used as the new wear lining when replacing an old wear lining with a new one during blast furnace runner repair. However, when lining precast blocks for blast furnace runner repair, compared to conventional frame-cast lining construction, the work required for block positioning and smoothing the installation surface increases, and the construction time tends to be long. In this regard, a new method is needed for blast furnace runner repair that can quickly line precast blocks as a wear lining. [Means for solving the problem]

[0005] As one of the means for solving the above problems, the present application provides: A lining method for a blast furnace trough precast block in repairing a blast furnace trough, comprising: removing at least a portion of the wear lining to expose the permanent lining; Installing the blast furnace runner precast block on the exposed surface of the permanent lining via a support part so that a gap is formed between the permanent lining and the blast furnace runner precast block; and Filling at least a portion of the gap with a casting material; A lining method including Disclose.

[0006] In the lining method of the present disclosure, A spike brick may be used as the support portion, The spike brick may be installed on the exposed surface of the permanent lining; The blast furnace trough precast blocks may be installed on top of the spike bricks.

[0007] The lining method of the present disclosure comprises: Fixing the blast furnace trough precast block with a block fixing device at least when filling the pouring material; may also include:

[0008] As one of the means for solving the above problems, the present application provides: A blast furnace trough lining structure, comprising at least a permanent lining, a support portion, a blast furnace trough precast block, and a pourable material, The support is located on the permanent lining, The blast furnace trough precast block is positioned on the support portion, The casting material is filled in at least a portion between the permanent lining and the blast furnace trough precast block. Blast furnace trough lining structure Disclose.

[0009] In the blast furnace lining structure of the present disclosure, the support portion may include a spike brick. [Effects of the Invention]

[0010] According to the lining method of the present disclosure, it is possible to accurately line precast blocks as wear linings in a short time when repairing blast furnace runners. Furthermore, according to the blast furnace runner lining structure of the present disclosure, it is possible to extend the life of the blast furnace runner, for example. [Brief explanation of the drawings]

[0011] [Figure 1]1 shows an example of the flow of the lining method of the present disclosure. [Figure 2] 1 shows an example of the flow of the lining method of the present disclosure. [Figure 3] 1 shows a schematic diagram of an example of the external shape of a precast block. [Figure 4] 4 shows the flow of a lining method according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0012] 1. Lining method for blast furnace trough precast blocks in blast furnace trough repair As shown in Figures 1 and 2, the lining method of the present disclosure is a lining method for a blast furnace runner precast block in blast furnace runner repair, and includes removing at least a portion of the wear lining 10 to expose the permanent lining 20 (step S1), installing the blast furnace runner precast block 40 on the exposed surface 20a of the permanent lining 20 via a support portion 30 so that a gap 50 is created between the permanent lining 20 and the blast furnace runner precast block 40 (step S2), and filling at least a portion of the gap 50 with a pourable material 60 (step S3).

[0013] 1.1 Process S1 As shown in FIGS. 2(A) and 2(B), in step S1, at least a portion of the wear lining 10 is removed to expose the permanent lining 20.

[0014] The wear lining 10 may be a known wear lining for a blast furnace runner. The wear lining 10 may be, for example, constructed of a precast block, or may be formed on a permanent lining 20 by frame pouring or other methods. When the blast furnace runner is in use, the wear lining 10 comes into contact with molten materials such as molten iron and molten slag, and may be gradually damaged by erosion or other effects caused by the molten materials. The lining method of the present disclosure can be said to be a technology for removing at least a portion of the damaged wear lining 10 and replacing it with a precast block 40. The wear lining 10 to be removed and the newly installed precast block 40 may be made of the same material or different materials.

[0015] The wear lining 10 may be removed by a known method. For example, at least a portion of the wear lining 10 can be removed by mechanically or manually chipping it. The wear lining 10 may be removed until at least a portion of the permanent lining 20 is exposed. In other words, in step S1, it is sufficient to remove a portion of the wear lining 10 so that a portion of the permanent lining 20 is exposed; it is not necessary to remove all of the wear lining 10. Although the lining method of the present disclosure can be applied even when all of the wear lining 10 is removed, the construction time will be increased accordingly.

[0016] The permanent lining 20 is disposed closer to the inside of the trough than the wear lining 10 (on the opposite side from the portion in contact with the molten material) and may be made of, for example, a known refractory material or insulating material. The permanent lining 20 is considered to have already been leveled and smoothed when the blast furnace trough was first installed or when the wear lining 10 was installed. Therefore, in the lining method disclosed herein, simply exposing a portion of the surface of the permanent lining 20 allows the exposed surface 20a to function as a reference surface for horizontality, parallelism, etc. In other words, when installing the precast block 40, there is no need to newly smooth or parallelize the installation surface, thereby reducing installation time. While it is possible to use a portion other than the permanent lining 20 (e.g., the remaining wear lining or the metal frame below the permanent lining) as the reference surface, it is believed that the effects of reducing installation time and preventing molten metal leakage are greatest when the permanent lining 20 functions as the reference surface. The position and size of the exposed portion of the permanent lining 20 may be any position and size that is appropriate as a reference surface, allows the support parts 30 described below to be stably installed, and allows the precast block 40 to be stably positioned via the support parts 30. For example, in the lining method of the present disclosure, the position and number of the support parts 30 may be determined so that the center of gravity of the precast block 40 is balanced and the compressive strength of the support parts 30 is not exceeded, and the position and size of the exposed surface 20a of the permanent lining 20 may be determined according to the position and number.

[0017] 1.2 Process S2 2(C) and (D), in step S2, a precast block 40 is placed on the exposed surface 20a of the permanent lining 20 exposed in step S1 via a support part 30. Here, a gap 50 is created between the permanent lining 20 and the precast block 40.

[0018] The support portion 30 functions as a foot for placing the precast block 40. The shape and size of the support portion 30 may be determined appropriately depending on the shape of the precast block 40, etc. For example, as shown in FIGS. 2(C) and 2(D), the support portion 30 may have a first surface that contacts the permanent lining 20 and a second surface that contacts the precast block 40, with a height between the first and second surfaces. Alternatively, as described below, the second surface may be integral with the precast block 40. Here, the first and second surfaces may both be substantially smooth or uneven, and the first and second surfaces may or may not be substantially parallel to each other. The shapes (top surface shapes) of the first and second surfaces are not particularly limited and may be rectangular, circular, or other shapes. The height of the support portion 30 is also not particularly limited. The support portion 30 need only form a gap 50 that can be appropriately filled with the pourable material 60, and may have a height of, for example, 50 mm or more, 55 mm or more, 60 mm or more, or 65 mm or more. The material of the support portion 30 is also not particularly limited, and may be made of, for example, a known refractory material. In particular, the higher the compressive strength of the support portion 30, the more the number of support points can be reduced, i.e., the area of ​​the exposed surface 20a of the permanent lining 20 can be reduced, which is considered to be advantageous in terms of construction time. The compressive strength of the support portion 30 may be, for example, 10 MPa or more, 20 MPa or more, 30 MPa or more, or 40 MPa or more.

[0019] In the lining method of the present disclosure, the permanent lining 20 may be used as a reference surface, and a support part 30 with fixed dimensions may be placed on top of it, with the precast block 40 then being placed on top of it. In this case, an intermediate material such as mortar or patching material may be sandwiched between the permanent lining 20 and the support part 30. This allows the support part 30 to be more appropriately placed on the permanent lining 20 while suppressing the gap between the permanent lining 20 and the support part 30. The shape of the intermediate material is not particularly limited, and for example, a sheet-like or layer-like intermediate material may be used.

[0020] The support portion 30 may be separate from the precast block 40. For example, as shown in FIGS. 2(C) and 2(D), spike bricks may be used as the support portion 30. In this case, the spike bricks are installed on the exposed surface 20a of the permanent lining 20, and the blast furnace trough precast block 40 is installed on the spike bricks. Alternatively, the support portion 30 may be integrated with the precast block 40 described below. For example, spike bricks or the like serving as the support portion 30 may be fixed to the precast block 40 before installation of the precast block 40, or legs serving as the support portion 30 may be formed in a part of the block during manufacturing (precasting) of the precast block 40. From the viewpoint of increasing the flexibility of construction, it is preferable to use a separate portion (e.g., spike bricks) as the support portion 30 from the precast block 40.

[0021] The blast furnace runner precast block 40 can function as a new wear lining after the blast furnace runner is repaired. The shape and size of the precast block 40 may be such that it can create a gap 50 when installed in the spike brick 30, and may be an appropriate shape and size for a wear lining of a blast furnace runner. The precast block 40 may have a recess (groove) 41 that functions as a flow path for molten material such as molten iron and molten slag when the blast furnace runner is in use. The shape and size of the recess (groove) 41 are not particularly limited. The material of the precast block 40 is also not particularly limited, and may be made of a known refractory material.

[0022] In the lining method disclosed herein, the dimensions of the support portion 30 and the precast block 40 can be fixed in advance, so the precast block 40 can be positioned simply by placing the precast block 40 on the support portion 30. This eliminates the need for positioning when installing the precast block 40, thereby reducing construction time. As described above, the support portion 30 and the precast block 40 may be separate entities. In this case, an intermediate material such as mortar or patching material may be sandwiched between the support portion 30 and the precast block 40. This reduces the gap between the support portion 30 and the precast block 40 and allows the precast block 40 to be more appropriately positioned on the support portion 30. The shape of the intermediate material is not particularly limited; for example, a sheet-like or layer-like intermediate material may be used.

[0023] The number of support parts 30 for installing one precast block 40 is not particularly limited, and may be one or more. An appropriate number of support parts 30 may be installed in appropriate positions on the permanent lining 20 depending on the shape and size of the support parts 30 and the shape and size of the precast block 40.

[0024] The size and shape of the gap 50 formed between the permanent lining 20 and the blast furnace trough precast block 40 are determined by the shape of the wear lining 10 remaining after step S1, the shape and size of the support part 30, the shape and size of the precast block 40, etc., and are not particularly limited. However, if the gap 50 is too small, it will be difficult to pour the pourable material 60 into it and fill it, so the gap 50 may be large enough to allow the pourable material 60 to be filled. Note that in the portion where the wear lining 10 remains on the surface of the permanent lining 20, a gap 50 may form between the permanent lining 20 and the precast block 40, and between the wear lining 10 and the precast block 40.

[0025] 1.3 Process S3 As shown in FIG. 2(E), in step S3, a casting material 60 is filled into at least a part of the gap 50 created in step S2.

[0026] The castable material 60 may be any material that has sufficient fluidity to be poured into the gap 50 and that can dry and solidify to become a refractory material after filling the gap 50. The castable material 60 may be made of the same material as the wear lining 10 or the precast block 40. By filling at least a portion of the gap 50 with the castable material 60, even if the precast block 40 is damaged during use of the blast furnace trough, the molten material can be stopped by the castable material 60, making it easy to prevent the molten material from leaking out of the system.

[0027] The filling of the gap 50 with the casting material 60 may be carried out by a known pouring method. The filling rate of the casting material 60 in the gap 50 is not particularly limited, and it is sufficient that the filling rate is high.

[0028] 1.4 Other processes The lining method of the present disclosure may include other steps in addition to the above steps S1 to S3. For example, as shown in FIGS. 2(E) and 2(F), the lining method of the present disclosure may include at least fixing the blast furnace runner precast block 40 with a block fixing device 70 when filling the blast furnace runner precast block 40 with the pourable material 60. The block fixing device 70 may be any device that can prevent the precast block 40 from shifting in position, floating, and / or falling over when filling the blast furnace runner precast block 40 with the pourable material 60, and its specific form is not particularly limited. For example, as shown in FIGS. 2(E) and 2(F), a core may be used as the block fixing device 70. That is, the lining method of the present disclosure may include placing the core in the recess (groove) 41 of the blast furnace runner precast block 40 and removing (detaching and removing) the core from the recess 41 of the blast furnace runner precast block 40 after filling the blast furnace runner precast block 40 with the pourable material 60. In this case, as shown in Figure 2(E), the core may have a convex shape corresponding to the recess (groove) 41 formed in the precast block 40. Furthermore, the core 70 may, for example, be configured to press the recess (groove) 41 formed in the precast block 40 in an appropriate direction (for example, the direction toward the support portion 30). This makes it possible to prevent the precast block 40 from floating up. Furthermore, if the core 70 is fixed outside the system, the core 70 can also be expected to have the effect of preventing the precast block 40 from shifting out of position.

[0029] In the lining method of the present disclosure, the order of installation of the support portion 30 and the precast block 40 in step S2 is not limited to the order shown in FIGS. 2(C) and 2(D). For example, as described above, the support portion 30 may be formed or fixed in advance to the lower portion of the blast furnace trough precast block 40, and the support portion 30 and the precast block 40 may be installed on the exposed surface 20a of the permanent lining 20. However, considering the degree of freedom in installation and workability, it is preferable to install the support portion 30, such as a spike brick, on the exposed surface 20a of the permanent lining 20, as shown in FIGS. 2(C) and 2(D), and then install the precast block 40 on the support portion 30. Furthermore, the order of steps S1 and S2 is not limited to the order shown in FIGS. 2(A) to 2(D). For example, step S2 may be performed simultaneously with step S1.

[0030] 2. Blast furnace trough lining structure In addition to the above-described aspect as a lining method, the technology of the present disclosure also has an aspect as a blast furnace runner lining structure. That is, as shown in Fig. 2(F), the blast furnace runner lining structure of the present disclosure has at least a permanent lining 20, a support portion 30, a blast furnace runner precast block 40, and a castable material 60. Here, the support portion 30 is located on the permanent lining 20, the blast furnace runner precast block 40 is located on the support portion 30, and the castable material 60 is filled at least partially between the permanent lining 20 and the blast furnace runner precast block 40. Each of the components has been described above, and detailed description thereof will be omitted here.

[0031] 3.Effects As described above, the lining method including steps S1 to S3 can provide a blast furnace trough lining structure as shown in Fig. 2(F). The advantageous effects of the technology of the present disclosure over the conventional technology are as follows, for example.

[0032] First, using precast blocks as wear linings increases the resistance to damage from molten materials such as molten pig iron and molten slag, thereby extending the life of the blast furnace runner. In this respect, there is an advantage to using precast blocks rather than frame-cast wear linings.

[0033] On the other hand, when precast blocks are used as wear linings, the work required to position the blocks and smooth the installation surface increases, which tends to increase the workload and construction time. In contrast, the lining method of the present disclosure is a method that allows for easy lining even for large precast blocks in a short time, and can be said to be a method that is practical for daily short-term blast furnace trough repairs. The advantages of this method over conventional techniques using precast blocks are further explained as follows.

[0034] For example, the technology disclosed in Patent Document 1 (JP 2004-323865 A) assumes that not only the wear lining but also the permanent lining and the like are integrated, and applying this technology requires the entire gutter to be replaced. While this technology is effective when blast furnace renovations and the like are being performed, from the perspective of daily repairs, the construction work is too large-scale, and there is a risk that the construction time will be long due to the various dismantling work required to replace the entire gutter. In contrast, the lining method disclosed herein does not require such large-scale construction work.

[0035] In addition, in the technology disclosed in Patent Document 2 (Japanese Patent Laid-Open Publication No. 59-185710), it is necessary to fix the precast block to the core and suspend the precast block in mid-air. In this case, a dedicated holder is required to fix the precast block to the core. Hold In contrast, with the lining method of the present disclosure, it is only necessary to place the precast block on the support portion, and there is no need to fix the precast block to the core, nor is there any need for a dedicated holding tool.

[0036] Furthermore, the technology disclosed in Patent Document 3 (Japanese Patent No. 6057653) appears to involve continuously arranging precast blocks directly on the permanent lining, but the specific construction method is unclear. If precast blocks were to be arranged directly on the permanent lining, as described above, the permanent lining would need to be smoothed, which would likely result in a long construction time. Furthermore, in order to install the precast blocks, the wear lining would need to be removed until the permanent lining surface was completely exposed. This raises concerns about damage to the permanent lining due to impacts from demolition machinery, and in some cases, the permanent lining may need to be repaired. Furthermore, because both the permanent lining and the precast blocks are standardized, their contact surfaces do not perfectly match, creating gaps that could lead to molten metal leaks. The technology disclosed in Patent Document 4 (Japanese Patent No. 6057654) also presents similar concerns. In contrast, the lining method disclosed herein is less likely to result in such concerns.

[0037] Furthermore, in the technology disclosed in Patent Document 5 (JP 59-143006 A), when placing precast blocks in a blast furnace trough and filling it with castable material, it is necessary to keep the precast blocks suspended while preventing them from shifting out of position, which results in a large workload.In contrast, in the lining method disclosed herein, the precast blocks are automatically positioned simply by placing them on the supports, and even when the precast blocks are subsequently filled with castable material, they are less likely to shift out of position, resulting in a smaller workload.

[0038] Furthermore, in the technology disclosed in Patent Document 6 (JP 2011-219806 A), large precast blocks are used for the permanent lining of large gutters, and stamping materials are used for leveling (parallelization). Because the large, heavy precast blocks are placed on top of the stamping materials, they can easily sink when placed, resulting in poor positioning accuracy. In addition, unevenness on the stamping material surface can create gaps between the precast blocks, potentially leading to leakage of the molten material. In contrast, the lining method disclosed herein places the precast blocks on the exposed surface of the permanent lining via supports, eliminating the risk of sinking of the precast blocks. Furthermore, filling the gaps with a pouring material makes it less likely for the molten material to leak. [Example]

[0039] The technology of the present disclosure will be described in more detail below with reference to examples, but the technology of the present disclosure is not limited to the following examples.

[0040] 1.Preparing the Precast Blocks Precast blocks with the following materials and properties were prepared. Figure 3 shows a schematic diagram of an example of the external shape of the precast blocks.

[0041] (Material and properties of precast blocks) · Chemical composition: Al2O368% by mass, SiC 20% by mass, SiO25% by mass, C 2% by mass, and the balance Apparent porosity (110°C x 24 hours): 11.7% Bulk density (110°C x 24 hours): 2.94 Compressive strength (110°C x 24 hours): 22 MPa Linear change rate (1000℃ x 3 hours): +0.01 Linear change rate (1500℃×3 hours): +0.13

[0042] 2. Conventional lining method (comparison example) When repairing a blast furnace slag trough (slag discharge trough), the construction time of a conventional lining method was evaluated when precast blocks were partially applied. Figure 4 shows a schematic flow of the precast block lining method according to a comparative example. In the comparative example, (1) First, as shown in Figures 4(A) and (B), the gutter at the planned construction site was dismantled and cleaned within a range of approximately 2000 mm. (2) Next, as shown in Figure 4(C), a stamp was applied to the bottom surface to level the bottom surface and form a structure to prevent molten metal leakage using the stamped material. (3) Next, as shown in Figure 4(D), the core was placed on top of several precast blocks, and the core and precast blocks were then fixed in place. (4) After that, as shown in Figure 4(E), the precast block was placed in the gutter together with the core, and then as shown in Figure 4(F), the gap between the precast block and the gutter demolition surface was filled with pourable material, and after curing, the frame was removed and the block was dried.

[0043] As a result of lining the precast blocks according to the above procedure, the construction time required for the lining method according to the comparative example was approximately 56 hours.

[0044] 3. Methods of the Disclosure (Examples) In the comparative lining method, the shape of the precast blocks cannot be changed, so it is necessary to apply a stamping material to the bottom surface to align the level (position) of the working surface. Furthermore, to ensure the precast block installation position, the stamping material and leveling (leveling) are required, which proves to be particularly time-consuming. Therefore, we considered a method that takes advantage of the fact that the shape of the precast blocks cannot be changed and install the precast blocks based on the permanent lining, which already has a predetermined reference surface. In this case, if the permanent lining and the precast block were to come into direct contact with each other, minute irregularities would create gaps between the permanent lining and the precast block, posing a risk of leaks. Therefore, we considered installing standard spike bricks as supports on the permanent lining and then installing the precast block on top of these to intentionally create gaps between the permanent lining and the precast block. This gap is then filled with a pouring material to eliminate the gap, thereby achieving a leak-proof structure. This method is believed to eliminate the time required for stamping material installation and leveling.

[0045] Based on the above considerations, the lining of the precast block according to the embodiment was carried out in the manner shown in Figures 1 and 2. Specifically, (1) First, as shown in Figure 2(A) and (B), a portion of the wear lining at the planned construction site was chipped off to expose the permanent lining. In this case, the permanent lining was exposed only at the spike brick installation position, to the extent that the precast blocks and remaining wear lining materials did not interfere with each other. (2) Next, as shown in Figure 2(C), spike bricks were installed in the exposed areas of the permanent lining. At this time, mortar was laid between the permanent lining and the spike bricks to prevent gaps. In addition, the installation position of the spike bricks was determined in advance, so that positioning could be completed simply by placing the precast blocks on top of the spike bricks. (3) Next, precast blocks were placed on top of the spike bricks, as shown in Figure 2(D). (4) Then, as shown in Figures 2(E) and (F), a core was placed in the recess (groove) of the precast block, and the gap between the precast block and the permanent lining was filled with pourable material. After curing, the block was removed from the frame and dried.

[0046] As a result of lining the precast blocks according to the above procedure, the lining method according to the embodiment required only about 50 hours of construction time, which was about 6 hours shorter than the lining method according to the comparative example. This effect of reducing construction time was achieved regardless of the type of blast furnace runner (molten iron runner, slag runner, etc.) and regardless of the cross-sectional shape or longitudinal shape of the runner (straight section, curved section, etc.). Furthermore, the lining method according to the embodiment could be implemented and completed while other blast furnace runners were in use during blast furnace operation, for example.

[0047] To avoid the time required for paralleling the stamping material, a frame-cast wear lining may be used instead of a standard precast block. However, frame-cast wear linings have poorer damage resistance to molten materials such as molten iron and molten slag than precast block wear linings. Therefore, using a frame-cast wear lining may shorten the life of the blast furnace trough, increase the frequency of repairs, and increase the workload over the long term. In this regard, even if it takes a slightly longer construction time, it is beneficial to use precast blocks as the wear lining. The technology disclosed herein can shorten the construction time. In other words, the technology disclosed herein can eliminate the drawbacks of using precast blocks as wear linings in blast furnace trough repairs. [Explanation of symbols]

[0048] 10. Clothing Lining 20 Permanent Lining 30 Support part 40 Blast furnace trough precast block 41 recess (groove) 50 gap 60 Casting material 70 Block Fixing Device

Claims

1. A lining method for a blast furnace trough precast block in repairing a blast furnace trough, comprising: removing at least a portion of the wear lining to expose the permanent lining; Installing the blast furnace runner precast block on the exposed surface of the permanent lining via a support part so that a gap is formed between the permanent lining and the blast furnace runner precast block; and Filling at least a portion of the gap with a casting material; A lining method comprising:

2. A spike brick is used as the support portion, the spike bricks are installed on the exposed surface of the permanent lining; The blast furnace trough precast block is installed on the spike brick. The lining method according to claim 1.

3. Fixing the blast furnace trough precast block with a block fixing device at least when filling the pouring material; The lining method according to claim 1 or 2, comprising:

4. A blast furnace trough lining structure, comprising at least a permanent lining, a support portion, a blast furnace trough precast block, and a pourable material, The support is located on the permanent lining, The blast furnace trough precast block is positioned on the support portion, The casting material is filled in at least a portion between the permanent lining and the blast furnace trough precast block. Blast furnace trough lining structure.

5. The support portion includes a spike brick. The blast furnace trough lining structure according to claim 4.

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