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Steel ladle working lining and method for building slag line part of steel ladle working lining

A technology of working lining and slag line, which is applied in the field of iron and steel metallurgical ladle lining repair, can solve the problems of reduced safety performance of ladle working lining, increased consumption and cost of magnesia-carbon bricks, high requirements for digging and repairing technology, and achieve economic and social benefits Remarkably, the effect of improving safe use performance and ensuring safe use performance

Active Publication Date: 2014-04-23
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, in order to meet the requirements of RH refining furnace development and production of ultra-low-carbon steel temperature drop and carbon increase process control, RH ladle working lining adopts carbon-free or low-carbon working lining, and ladle working slag line parts are made of magnesia-carbon bricks The integrated working lining of the cladding wall and the cladding bottom below the slag line and the cladding material is integrally poured with corundum-spinel castables, which is currently a low-carbon working lining for ladles widely used at home and abroad. However, the existing ladle working lining structure design and repair The method has the following problems and deficiencies: all magnesia-carbon bricks on the slag line are designed with a single-ring structure. In order to ensure the safe performance of the working lining of the ladle, whenever the residual thickness of the magnesia-carbon brick at the slag line reaches 50-80mm, it must be off-line Stop using, remove all magnesia carbon bricks at the slag line and replace with new magnesia carbon bricks, resulting in waste of magnesia carbon bricks with a residual thickness of 50-80mm, increasing the consumption and cost of magnesia carbon bricks
Insufficient of the invention: the digging and mending process requires high requirements, the technical difficulty is high, the safety performance of the working lining of the ladle after the dredging and mending is reduced, and ladle wear accidents are prone to occur
The disadvantage of this invention: the magnesia-carbon bricks of the ladle slag line are all designed with a single-ring structure. When the first and third off-line minor repairs are carried out, except that the 2-3 layers of magnesia-carbon bricks in the lower part of the slag line are not removed, the rest of the slag line Magnesia carbon bricks are removed and replaced, which increases the consumption and cost of magnesia carbon bricks
Insufficient of the invention: the magnesia-carbon brick of the ladle slag line adopts a single-ring structure design. In order to ensure the safe performance of the working lining of the ladle, the magnesia-carbon brick at the slag line must retain sufficient erosion residual thickness, thereby increasing the magnesia-carbon brick. consumption and cost

Method used

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  • Steel ladle working lining and method for building slag line part of steel ladle working lining

Examples

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Effect test

Embodiment 1

[0037] like figure 1 As shown, a ladle working lining, including magnesia-carbon brick 1 for the outer ring of the slag line, 2 magnesia-carbon bricks for the inner ring of the slag line, 3 single-ring magnesia-carbon bricks for the lower part of the slag line, 4 working lining castables for the wall, and 4 working lining for the bottom Casting material 5, ladle edge castable material 6, single-ring cladding brick 7, the inner wall of ladle shell 10 is laid with permanent lining heat-insulating refractory board 11, permanent lining castable material 12, and nozzle seat is installed in ladle bottom working lining castable material 5 Brick 8, breathable seat brick 9.

[0038] On the upper part of the bottom permanent lining castable 12, from bottom to top, there are bottom working lining castable 5, wall working lining castable 4, single-ring magnesia carbon brick 3 at the bottom of the slag line, and magnesia carbon brick 1 at the outer ring of the slag line. The length a is 5...

Embodiment 2

[0051] Others are the same as embodiment 1, the difference is:

[0052] The length a of the magnesia-carbon brick 1 in the outer ring of the slag line is 80 mm, and the length b of the magnesia-carbon brick 2 in the inner ring of the slag line is 120 mm.

[0053] The thickness c of the wall-wrapping working lining castable 4 is 180mm, and the thickness m of the bottom-wrapping working lining castable 5 is 350mm.

[0054] The method for repairing the working slag line of the ladle provided by the present invention includes two repair methods for minor repair and medium repair, and the steps are as follows:

[0055] 1) Minor repair of ladle working lining and repair method of slag line:

[0056] The new working lining of the ladle is used for 40-50 heats. When the residual thickness of the single-ring magnesia-carbon brick 3 at the lower part of the slag line is 110-120mm (about 115mm), a minor repair of the working lining of the ladle is carried out. The minor repair method is...

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Abstract

The invention relates to a steel ladle working lining and a method for building a slag line part of the steel ladle working lining, belonging to the field of building technologies of ferrous metallurgy steel ladle linings. The steel ladle working lining is characterized in that 2-3 lays of slag line lower part monocyclic magnesium carbon bricks (3) are built, then slag line magnesium carbon bricks are built in two cycles of slag line external cycle of magnesium carbon bricks (1) and slag line inner cycle of magnesium carbon bricks (2), and then 1-2 layers of monocyclic opening wrapping bricks (7) and pouring bag edge pouring materials (6) are built on the upper part from top to bottom; the method for building the slag line part of the steel ladle working lining is characterized in that when minor repair is needed for the steel ladle working lining, the slag line inner cycle of magnesium carbon bricks (2) are not disassembled, but only the slag line external cycle of magnesium carbon bricks (1) are replaced. Due to the steel ladle working lining and the method for building the slag line part of the steel ladle working lining, safe using performance of the steel ladle working lining is ensured; and consumption and cost of the slag line magnesium carbon bricks are reduced by 20-30%.

Description

technical field [0001] The invention relates to a ladle working lining and a method for repairing the slag line part thereof, and belongs to the technical field of iron and steel metallurgy ladle inner lining repair. Background technique [0002] The ladle is a container for shipping molten steel for steelmaking, and it is also the basic container for molten steel refining furnaces such as LF and RH. Its inner lining generally includes permanent lining and working lining. In recent years, in order to meet the requirements of RH refining furnace development and production of ultra-low-carbon steel temperature drop and carbon increase process control, RH ladle working lining adopts carbon-free or low-carbon working lining, and ladle working slag line parts are made of magnesia-carbon bricks The integrated working lining of the cladding wall and the cladding bottom below the slag line and the cladding material is integrally poured with corundum-spinel castables, which is curren...

Claims

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Application Information

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IPC IPC(8): B22D41/02
Inventor 武光君武文健
Owner LAIWU IRON & STEEL GRP
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