Method for repairing working lining of ladle wall
阅读说明：本技术 钢包包壁工作衬的修砌方法 (Method for repairing working lining of ladle wall ) 是由 沈明科 薛军柱 方义能 刘光平 罗明 邬晓滢 于 2020-05-12 设计创作，主要内容包括：本申请公开了一种钢包包壁工作衬的修砌方法,钢包下线修理时,测量钢包包壁工作衬残厚,并判断残厚是否满足预设条件,当残厚满足预设条件时,对钢包包壁工作衬进行修砌,残厚满足预设条件的钢包包壁工作衬处为待修砌区,修砌包括以下步骤：S1：涂抹修补料至待修砌区处,形成修砌区；S2：在修砌区贴砌钢包包壁预制砖；其中,预设条件为钢包包壁工作衬残厚小于100mm,或者钢包包壁工作衬残厚与相邻其他区域残厚的差值大于30mm；每次钢包下线修理时,若满足预设条件,则重复步骤S1以及步骤S2。本申请提供的钢包包壁工作衬的修砌方法,能使钢包耐材达到均匀熔损,从而延长钢包寿命,降低材料消耗,确保钢包安全运行。(The application discloses method of building a work lining of a ladle wall, when a ladle is off-line for repairing, the residual thickness of the work lining of the ladle wall is measured, whether the residual thickness meets the preset condition is judged, when the residual thickness meets the preset condition, the work lining of the ladle wall is built, the position of the work lining of the ladle wall, where the residual thickness meets the preset condition, is a region to be built, and the building comprises the following steps: s1: coating the repairing material to the position of the area to be repaired to form a repairing area; s2: the prefabricated brick of the ladle wall is laid in the building area; the preset condition is that the residual thickness of the working lining of the ladle wall is less than 100mm, or the difference value between the residual thickness of the working lining of the ladle wall and the residual thickness of other adjacent areas is more than 30 mm; and repeating the step S1 and the step S2 if the preset condition is met every time the ladle is repaired off line. The method for repairing the working lining of the ladle wall of the ladle can enable the refractory material of the ladle to be uniformly melted and damaged, so that the service life of the ladle is prolonged, the material consumption is reduced, and the safe operation of the ladle is ensured.)
1. A method for building a working lining on a ladle wall is characterized in that when a ladle is offline for repairing, the residual thickness of the working lining on the ladle wall is measured, whether the residual thickness meets a preset condition is judged, when the residual thickness meets the preset condition, the working lining on the ladle wall is built, the working lining on the ladle wall with the residual thickness meeting the preset condition is a region to be built, and the building comprises the following steps:
s1: coating the repairing material to the position of the area to be repaired to form a repairing area;
s2: laying prefabricated bricks of the ladle wall in the building area;
the preset condition is that the residual thickness of the working lining of the ladle wall is less than 100mm, or the difference value between the residual thickness of the working lining of the ladle wall and the residual thickness of other adjacent areas is more than 30 mm;
and repeating the step S1 and the step S2 if the preset condition is met every time the ladle is repaired off line.
2. The method for repairing the ladle wall working lining according to claim 1, wherein the coating thickness of the repairing material is 1/10-1/3 of the residue thickness of the ladle wall working lining, or the coating thickness of the repairing material is 1/3-1 of the difference value between the residue thickness of the ladle wall working lining and the residue thickness of other adjacent areas.
3. The method for repairing the working lining of the ladle wall as recited in claim 1, wherein the coating thickness of the repairing material is 10 mm-30 mm.
4. The method for repairing the working lining of the ladle wall as recited in claim 1, wherein the coating thickness of the repairing material is 10 mm-20 mm.
5. The method for repairing the working lining of the ladle wall as recited in claim 1, wherein the repairing material is a corundum spinel repairing material.
6. The method for repairing the ladle wall working lining according to claim 1, wherein the thickness of the ladle wall prefabricated brick is 1/3-1/2 of the residual thickness of the ladle wall working lining, or the thickness of the ladle wall prefabricated brick is 1-1.5 times of the difference value between the residual thickness of the ladle wall working lining and the residual thickness of other adjacent areas.
7. The method for repairing the ladle wall working lining as recited in claim 1, wherein the thickness of the ladle wall precast brick is 30mm to 60 mm.
8. The method for repairing the working lining of the ladle wall as claimed in claim 1, wherein the sum of the coating thickness of the repairing material and the thickness of the prefabricated brick of the ladle wall is greater than the difference between the residual thickness of the working lining of the ladle wall and the residual thickness of the adjacent other areas; or the sum of the coating thickness of the repair material and the thickness of the prefabricated bricks on the ladle wall is greater than 1/3 of the residual thickness of the working lining of the ladle wall.
9. The method of claim 1, further comprising cleaning the surface of the ladle wall liner prior to measuring the residual thickness of the ladle wall liner.
10. The method for repairing the ladle wall working lining as recited in claim 9, further comprising replacing the nozzle pocket brick, the gas permeable pocket brick and the working lining slag line magnesia carbon brick in the ladle before cleaning the surface of the ladle wall working lining.
Technical Field
The application relates to the field of steel metallurgical steel ladles, in particular to a method for repairing a working lining of a ladle wall.
Background
With the rapid development of the steel industry and the continuous progress and development of the steel-making technology, the varieties of steel are increasing, the requirements on the quality of the steel are strict, the refining technology of the steel ladle and the development and production of ultra-low carbon steel put forward higher requirements on the refractory material of the working lining of the steel ladle, the working lining of the steel ladle develops towards low carbon, ultra-low carbon and no carbon, and meanwhile, the service life of the working lining of the steel ladle is required to be continuously prolonged. At present, refining ladles of domestic large-scale steel mills generally adopt low-carbon working layers, and part of large-scale ladle wall molten pools are built by prefabricated bricks.
Because the local melting loss phenomenon can appear in the refining process in ladle peritheca work lining resistant material, original solution has the problem: the working lining refractory material is integrally replaced due to local refractory material melting loss, refractory material resources are wasted, the labor intensity of workers is increased, and the operation pressure of the steel ladle is increased. Secondly, the repair material is partially adopted for repairing, the repair material is adopted for local repairing, and the repair material is repaired in a manual smearing mode, so that the repair material on the repair material is poor in compactness, the repair thickness is small, and the phenomena of material falling and over-quick melting loss are easy to occur in the using process. And thirdly, patching and repairing, namely excavating and replacing the prefabricated bricks with fast local melting loss, the method has high labor intensity, and simultaneously, the bricks built by patching and repairing have large brick joints and obvious potential safety hazards. And fourthly, pouring and repairing in a sleeving way, wherein the whole peeling treatment needs to be carried out on the metamorphic layer of the working lining, and the mould support needs to be carried out. Spray repair, namely, aiming at the reconstruction lining technology of the integrally cast ladle working lining, the integral replacement of the working lining refractory material is equivalent, and related equipment needs to be added. Therefore, the problems of large material consumption, complex repairing operation and poor repairing effect exist in the process of repairing the conventional ladle wall working lining.
Disclosure of Invention
Therefore, it is necessary to provide a method for repairing a working lining of a ladle wall, aiming at the technical problems of large material consumption, complex operation and poor repairing effect in the process of repairing the working lining of the ladle wall.
In order to achieve the purpose, the following technical scheme is adopted in the application: a method for repairing a working lining of a ladle wall comprises the steps of measuring the residual thickness of the working lining of the ladle wall when a ladle is offline for repairing, judging whether the residual thickness meets a preset condition, and repairing the working lining of the ladle wall when the residual thickness meets the preset condition, wherein the part, meeting the preset condition, of the working lining of the ladle wall is a region to be repaired, and the repairing comprises the following steps:
s1: coating the repairing material to the position of the area to be repaired to form a repairing area;
s2: laying prefabricated bricks of the ladle wall in the building area;
the preset condition is that the residual thickness of the working lining of the ladle wall is less than 100mm, or the difference value between the residual thickness of the working lining of the ladle wall and the residual thickness of other adjacent areas is more than 30 mm;
and repeating the step S1 and the step S2 if the preset condition is met every time the ladle is repaired off line.
Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.
Optionally, the coating thickness of the repair material is 1/10-1/3 of the residual thickness of the working lining of the ladle wall.
Optionally, the coating thickness of the repair material is 1/3-1 of the difference value between the residual thickness of the working lining of the ladle wall and the residual thickness of other adjacent areas.
Optionally, the coating thickness of the patching material is 10 mm-30 mm.
Optionally, the coating thickness of the patching material is 10 mm-20 mm.
Optionally, the patching material is a corundum spinel patching material.
Optionally, the thickness of the ladle wall prefabricated brick is 1/3-1/2 of the residual thickness of the ladle wall working lining.
Optionally, the thickness of the prefabricated brick for the ladle wall is 1-1.5 of the difference value between the residual thickness of the working lining of the ladle wall and the residual thickness of other adjacent areas.
Optionally, the thickness of the prefabricated brick for the ladle wall is 30-60 mm.
Optionally, the sum of the coating thickness of the repair material and the thickness of the prefabricated bricks on the wall of the steel ladle is greater than the difference between the residual thickness of the working lining of the wall of the steel ladle and the residual thickness of other adjacent areas.
Optionally, the sum of the coating thickness of the repair material and the thickness of the prefabricated bricks on the ladle wall is greater than 1/3 of the residual thickness of the working lining of the ladle wall.
Optionally, the method further comprises cleaning the surface of the ladle wall working lining before measuring the residual thickness of the ladle wall working lining.
Optionally, the method further comprises replacing the nozzle pocket brick, the gas permeable pocket brick and the magnesia carbon brick of the working lining slag line in the ladle before cleaning the surface of the working lining of the ladle wall.
The application provides a ladle wall work lining repair method, adopt the repair material to paint the repair earlier, then paste the small-size prefabricated brick of building and repair, ensure ladle safe operation to the life of extension ladle wall work lining makes ladle wall work lining refractory material reach even melting loss, reduces ladle wall work lining refractory material consumption.
Drawings
Fig. 1 is a schematic structural diagram of a repaired ladle according to an embodiment of the present application;
fig. 2 is a partially enlarged schematic view of the ladle shown in fig. 1 at a.
The reference numerals in the figures are illustrated as follows:
1. steel ladle permanent layer refractory material; 2. wrapping the steel ladle with a refractory material; 3. a magnesia carbon brick of a slag line of a ladle working lining; 4. prefabricating bricks on the wall of the steel ladle working lining; 5. the ladle bottom working lining refractory material; 6. a nozzle pocket brick; 7. an air-permeable brick cup; 8. smearing and repairing corundum spinel; 9. the ladle wall small-size prefabricated brick.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 2 together, an embodiment of the present application provides a method for repairing a working lining of a ladle wall, which measures a residual thickness of the working lining of the ladle wall during offline repair of a ladle, determines whether the residual thickness meets a preset condition, and repairs the working lining of the ladle wall when the residual thickness meets the preset condition. After the working lining of the ladle wall is locally melted and damaged, locally repairing the residual and thin area of the working lining of the ladle wall.
It can be understood that the residual thickness is the residual thickness of the steel ladle wall working lining after the prefabricated brick of the steel ladle wall working lining is eroded when the steel ladle working lining is subjected to small repair or medium repair, and the thickness is the thickness of the steel ladle wall along the radial direction. The off-line repair of the ladle is that the off-line inspection, confirmation, maintenance and replacement are required when the ladle runs safely due to the fact that the service life of the ladle nozzle pocket brick, the air permeable pocket brick, the slag line magnesia carbon brick, the ladle bottom working lining and the ladle wall prefabricated brick is prolonged or the residual thickness of the ladle wall prefabricated brick is judged to influence the safe operation of the ladle in the using process of the ladle.
The steel ladle wall working lining with the residual thickness meeting the preset condition is a to-be-repaired area, namely the to-be-repaired area is corresponding to the area A in the figure 1, the preset condition is that the residual thickness of the steel ladle wall working lining is smaller than 100mm, or the difference value between the residual thickness of the steel ladle wall working lining and the residual thickness of other adjacent areas is larger than 30mm, and the steel ladle wall working lining can be repaired as long as one of the two is met. The other adjacent areas are other areas adjacent to the area to be repaired and are not thinner areas.
The building method comprises the following steps:
s1: coating the repairing material to the position of the area to be repaired to form a repairing area;
s2: the prefabricated brick of the ladle wall is laid in the building area;
and repeating the step S1 and the step S2 if the preset condition is met every time the ladle is repaired off line.
The method for repairing the working lining of the ladle wall provided by the embodiment adopts the steps of smearing the repairing material and repairing prefabricated bricks of the ladle wall to match, does not need to replace the working lining integrally, does not need to dig out the prefabricated bricks with fast local melting loss, is simple in repairing operation, can meet the use condition of repairing thickness, is not easy to drop the material, and saves refractory materials.
In order to ensure the smearing thickness of the repairing material, the prefabricated bricks are pasted on the working lining of the ladle wall, the material is not easy to fall off, and the smearing thickness of the repairing material is 1/10-1/3 of the residual thickness of the working lining of the ladle wall. Or the coating thickness of the repair material is 1/3-1 of the difference value between the residual thickness of the working lining of the ladle wall and the residual thickness of other adjacent areas.
In one embodiment, the coating thickness of the repair material is 10-30 mm. Preferably, the coating thickness of the mending material is 10 mm-20 mm, for example, 15mm is selected.
Specifically, the patching material is a ladle wall working lining corundum spinel
In order to realize better building effect, compensate local melting loss of the ladle wall, reduce the melting loss speed after building and reduce the repairing times, the thickness of the prefabricated brick of the ladle wall and the residual thickness of the working lining of the ladle wall or the thickness of the prefabricated brick of the ladle wall and the residual thickness of the working lining of the ladle wall should meet a certain relation. In one embodiment, the thickness of the ladle wall prefabricated brick is 1/3-1/2 of the residual thickness of the ladle wall working lining. Or the thickness of the prefabricated brick of the ladle wall is 1-1.5 times of the difference value between the residual thickness of the working lining of the ladle wall and the residual thickness of other adjacent areas, namely, the thickness of the prefabricated brick of the ladle wall is larger than the difference value. Preferably, the thickness of the prefabricated brick of the ladle wall is 30mm to 60mm, for example, the specification of the small prefabricated brick 9 of the ladle wall can be 230mm by 114mm by 50mm, 230mm by 114mm by 30mm, 230mm by 114mm by 40mm, etc.
Specifically, the small prefabricated brick 9 of ladle wall is the small prefabricated brick of corundum spinel, and the small prefabricated brick 9 of ladle wall is thinner than the ordinary prefabricated brick, and is prepared by pouring, prefabricating and molding or machine press type by taking corundum, spinel (or magnesia), alumina micropowder, pure calcium aluminate cement and the like as main raw materials, and the working layer thickness of the small prefabricated brick 9 of ladle wall is 30-60 mm, and the small prefabricated brick 9 of ladle wall is subjected to baking treatment, and is directly built during field use without independent maintenance and baking. For example, the volume density of the small prefabricated brick 9 of the ladle wall is 3.05g/cm3～3.25g/cm3In weight percent, Al2O3% of 92.00-95.00% and MgO% of 2.00-5.00%. In one embodiment, the sum of the coating thickness of the repair material and the thickness of the prefabricated bricks on the ladle wall is greater than the difference between the residual thickness of the working lining of the ladle wall and the residual thickness of other adjacent areas. In other embodiments, the sum of the coating thickness of the repair material and the thickness of the prefabricated bricks on the ladle wall is greater than 1/3 of the residual thickness of the working lining of the ladle wall, so that the repair effect is ensured.
It should be noted that the repaired part is not required to be maintained and baked additionally, and the repaired part is maintained and baked only according to the normal ladle repairing procedure.
In one embodiment, the ladle wall working lining repairing method further comprises cleaning the surface of the ladle wall working lining before measuring the residual thickness of the ladle wall working lining so as to provide a clean environment for repairing.
In one embodiment, the ladle wall working lining repairing method further comprises replacing the
In one embodiment, as shown in fig. 1, the ladle permanent layer refractory material 1 is distributed in the circumferential direction of the ladle, and the ladle is sequentially distributed with the ladle along the refractory material 2, the ladle working lining slag line magnesia carbon brick 3, the ladle working lining wall prefabricated brick 4, the ladle bottom working lining refractory material 5, the
When the ladle built by precast bricks is used in the middle and later periods, the local melting loss of the ladle wall working lining of the ladle wall precast bricks 4 is serious, and the ladle wall working lining corundum spinel daubing
1) when the ladle is off-line for repairing, replacing a nozzle pocket brick, a gas permeable pocket brick and a work lining slag line magnesia carbon brick, and cleaning the surface of a work lining of the ladle wall;
2) measuring and checking the residual thickness of the working lining of the ladle wall: when the local melting loss of the working lining of the ladle wall is too fast and the residual thickness is less than 100mm of the safe operation residual thickness, or the difference between the residual thickness of the local working layer of the ladle wall and the residual thickness of the refractory material of other adjacent areas is more than 30mm, locally repairing the area with thinner residual thickness (namely the area to be repaired);
3) coating and repairing corundum spinel coating and repairing
4) and (3) in the area of the ladle smearing repair material (namely the repair area formed by smearing the repair material), the small prefabricated bricks 9 which are made of the same material as the prefabricated bricks of the ladle and have the thickness of 30-50 mm are adopted for sticking, and the sticking bricks are tightly attached to the working lining of the ladle wall.
5) In the process of the steel ladle re-off-line repair, if the residual thickness of the working lining of the steel ladle wall is found to be smaller than the residual thickness of safe operation by 100mm, or the residual thickness of the local working layer of the steel ladle wall is different from the residual thickness of the refractory material of other areas by more than 30mm, the local repair is carried out on the area with the thinner residual thickness by adopting a smearing and patching repairing method.
And in the process of the steel ladle being offline again and repairing, if the local melting loss of the working lining of the wall of the steel ladle is found to be too fast again and the preset condition is met, locally repairing the residual thick and thin area again.
Specific examples are provided below.
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