Steel ladle body pouring and building method

Abstract

The invention discloses a steel ladle body pouring and building method, and relates to the technical field of steel ladle manufacturing. The method comprises the following steps that A, a steel ladle is unpacked, a permanent layer of the steel ladle is repaired, and then steel ladle bottom bricks are built at the bottom of the steel ladle; b, steel ladle sleeve casting bricks are built on the inner side of a ladle body of the middle-lower section of the steel ladle; c, an asymmetric bush casting moulding bed is placed in the steel ladle, steel structures at the corresponding positions of the tapping side and the deslagging side of the asymmetric bush casting moulding bed are arranged in a concave mode, so that the pouring thickness of the ladle lining material on the tapping side and the deslagging side is larger than that of the ladle lining material on other portions, and then the ladle lining material pouring operation is conducted; and D, demolding after the ladle lining material is hardened, and building ladle slag line bricks on the inner side of the ladle body of the upper section of the ladle to obtain the ladle which can be put into use. Compared with the prior art, the problem that in the prior art, due to the fact that local erosion of a ladle lining material of a steel ladle is too fast, the overall ladle age of the steel ladle is low can be solved.

Description

Technical Field

[0001] This invention relates to the field of steel ladle manufacturing technology, and in particular to a method for casting and assembling the body of a steel ladle. Background Technology

[0002] In the steel smelting process, the ladle, as the core equipment for holding and transferring high-temperature molten steel, has lining materials that are in direct contact with the molten steel and must withstand high-temperature radiation, erosion by the molten steel, and chemical corrosion for extended periods. Due to varying operating conditions, the corrosion rate of different parts of the lining material is uneven. The tapping side, due to the continuous erosion during molten steel casting, and the slag dumping side, due to the chemical corrosion and mechanical impact of the slag, experience significantly faster corrosion rates than other parts such as the trunnion side. This uneven corrosion leads to a lower overall ladle life, often forcing the ladle to be taken offline due to excessive wear of localized linings. This not only increases equipment maintenance costs but may also disrupt production continuity due to frequent ladle replacements.

[0003] Existing steel ladle lining construction methods mostly employ a symmetrical design, meaning the lining thickness is uniform across all parts. This fails to address the varying erosion characteristics in different areas and makes it difficult to solve the problem of excessively rapid localized wear. Therefore, there is an urgent need for a construction method that can optimize the lining structure based on erosion characteristics to improve the service life of steel ladles and reduce production costs. Summary of the Invention

[0004] The purpose of this invention is to provide a method for casting and lining the body of a steel ladle, which can solve the problem in the prior art where the overall lifespan of the steel ladle is too low due to the rapid local erosion of the lining material.

[0005] To solve the above problems, the technical solution adopted by the present invention is: a method for casting and assembling a steel ladle body, characterized by comprising the following steps: A. Unpack the ladle and repair the permanent layer of the ladle, and then build the bottom bricks of the ladle at the bottom of the ladle; B. Construct a steel ladle sleeve with cast bricks inside the lower section of the ladle body; C. Place the asymmetrical casting mold into the ladle. The steel structure at the corresponding positions of the steel tapping side and the slag pouring side of the asymmetrical casting mold is recessed so that the thickness of the lining material on the steel tapping side and the slag pouring side is greater than the thickness of the lining material in other parts. Then, the lining material is poured. D. After the lining material has hardened, demold the ladle and build ladle slag line bricks on the inner side of the upper section of the ladle body to obtain a usable ladle.

[0006] In the above technical solution, a more specific technical solution may be: in step C, the length of the concave arc segment of the steel structure of the asymmetric casting mold is 30% to 35% of the inner circumference of the lining material.

[0007] Further, in step C, the steel structure recess depth of the asymmetric ladle pouring mold at the corresponding positions of the tapping side and the slagging side is 40mm-60mm.

[0008] Further, in step C, the top of the lining material after pouring is 100mm higher than the top of the ladle lining brick.

[0009] Further, in step A, the unpacking process includes cleaning the residual steel slag and cold steel in the ladle, and detecting the metal shell of the ladle, and repairing the defect positions with cracks, deformation or wear.

[0010] Compared with the prior art, the present application has the following beneficial effects: The present application effectively offsets the erosion rate of the high loss area by thickening the lining material 40mm-60mm at the most serious tapping side and slagging side through the asymmetric ladle pouring mold design, so that the use group number of the ladle after single ladle pouring construction is increased from the original 3 groups to 4 groups, the single ladle pouring ladle age is increased from the original 120 furnaces to 160 furnaces, the early shutdown of the ladle due to too fast local erosion is reduced, and the replacement frequency of the lining material and the equipment maintenance cost are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a structural schematic diagram of the present application; Figure 2 is the A-A cross-sectional view of Figure 1 . DETAILED DESCRIPTION

[0012] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application, but the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0013] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0014] Embodiment 1: As shown in the ladle shell lining construction method shown in Figure 1 and Figure 2 The ladle shell lining construction method comprises the following steps: A, disassembling the ladle and repairing the permanent layer 2 of the ladle, and then lining the ladle bottom brick 3 at the bottom of the ladle; B, lining the ladle lining brick 4 on the inner side of the middle section of the ladle shell; C, placing the asymmetric lining mold 5 into the ladle, and setting the steel structure of the asymmetric lining mold 5 in a concave manner at the corresponding positions of the tapping side 5-1 and the slagging side 5-2, so that the lining material 6 has a larger pouring thickness at the tapping side 5-1 and the slagging side 5-2 than at other positions, and then performing the lining material 6 pouring operation; D, after the lining material 6 hardens, demolding, lining the ladle slag line brick 7 on the inner side of the upper section of the ladle shell, and obtaining a ladle that can be put into use.

[0015] In step C, the sum of the lengths L1 and L2 of the concave arc segments of the steel structure of the asymmetric lining mold 5 is 30% of the inner circumferential length of the lining material 6. The concave depth of the steel structure of the asymmetric lining mold 5 at the corresponding positions of the tapping side 5-1 and the slagging side 5-2 is 40mm, so the regular pouring thickness L3 of the lining material at other positions is 100mm, and the pouring thickness L4 of the lining material at the tapping side 5-1 and the slagging side 5-2 is 140mm. After the lining material 6 is poured, the height H of the top of the lining material 6 above the top of the ladle lining brick 4 is 100mm.

[0016] In step A, the disassembling process includes cleaning the remaining steel slag and cold steel in the ladle, and detecting the metal shell 1 of the ladle, and repairing the defect positions with cracks, deformation or wear.

[0017] Embodiment 2: In step C, the sum of the lengths L1 and L2 of the concave arc segments of the asymmetric sleeve casting mold 5 is 33% of the inner circumferential length of the lining material 6. The concave depth of the steel structure of the corresponding positions of the tapping side 5-1 and the slagging side 5-2 of the asymmetric sleeve casting mold 5 is 50 mm, and thus the conventional casting thickness L3 of the lining material at other positions is 100 mm, and the casting thickness L4 of the lining material at the tapping side 5-1 and the slagging side 5-2 is 150 mm.

[0018] Other features are the same as those in embodiment 1.

[0019] Embodiment 3: In step C, the sum of the lengths L1 and L2 of the concave arc segments of the asymmetric sleeve casting mold 5 is 35% of the inner circumferential length of the lining material 6. The concave depth of the steel structure of the corresponding positions of the tapping side 5-1 and the slagging side 5-2 of the asymmetric sleeve casting mold 5 is 60 mm, and thus the conventional casting thickness L3 of the lining material at other positions is 100 mm, and the casting thickness L4 of the lining material at the tapping side 5-1 and the slagging side 5-2 is 160 mm.

[0020] Other features are the same as those in embodiment 1.

[0021] In actual use, the ladle can be stably used for 4 groups after single sleeve casting construction, each group is used for 40 furnaces, and the single sleeve casting service life is 160 furnaces. After each group is used, the residual steel slag and cold steel on the surface of the ladle are simply cleaned, and then the ladle can be reused. After repeated use for 4 groups, the ladle is re-poured and constructed according to the steps of the above method; the service life of the ladle ends after the ladle is used for 6 times of sleeve casting, and the total service life is 960 furnaces, and the ladle is scrapped as a whole. During the use of the ladle, the tapping side and the slagging side are eroded the fastest. Because the lining material is thickened by 40 mm to 60 mm, the residual thickness of each part is basically balanced when the ladle is re-poured, so that the risk caused by the local residual thickness being too thin is avoided, and the implementation of the next sleeve casting operation is also facilitated.

[0022] The present application thickens the lining material by 40 mm to 60 mm at the tapping side and the slagging side which are eroded the most seriously through the design of the asymmetric sleeve casting mold, effectively offsets the erosion rate of the high-loss area, increases the number of groups of the ladle after single sleeve casting construction from 3 groups to 4 groups, increases the service life of the ladle after single sleeve casting from 120 furnaces to 160 furnaces, reduces the early shutdown of the ladle caused by too fast local erosion, and reduces the replacement frequency of the lining material and the equipment maintenance cost.

Claims

1. A method for casting and assembling a steel ladle body, characterized in that: Includes the following steps: A. Unpack the ladle and repair the permanent layer of the ladle, and then build the bottom bricks of the ladle at the bottom of the ladle; B. Construct a steel ladle sleeve with cast bricks inside the lower section of the ladle body; C. Place the asymmetrical casting mold into the ladle. The steel structure at the corresponding positions of the steel tapping side and the slag pouring side of the asymmetrical casting mold is recessed so that the thickness of the lining material on the steel tapping side and the slag pouring side is greater than the thickness of the lining material in other parts. Then, the lining material is poured. D. After the lining material has hardened, demold the ladle and build ladle slag line bricks on the inner side of the upper section of the ladle body to obtain a usable ladle.

2. The method for casting and lining the steel ladle body according to claim 1, characterized in that: In step C, the length of the recessed arc segment of the steel structure of the asymmetrical casting mold is 30% to 35% of the inner circumference of the lining material.

3. The method for casting and lining the steel ladle body according to claim 1, characterized in that: In step C, the steel structure recess depth at the corresponding positions of the steel outlet side and slag pouring side of the asymmetrical casting mold is 40mm to 60mm.

4. The method for casting and lining the steel ladle body according to claim 1, characterized in that: In step C, after the lining material is poured, its top must extend 100 mm beyond the top of the steel cladding brick.

5. The method for casting and lining the steel ladle body according to claim 1, characterized in that: In step A, the unpacking process includes cleaning the steel slag and cold steel remaining inside the ladle, inspecting the metal outer shell of the ladle, and repairing any defects such as cracks, deformation, or wear.

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