CN101412109B - Building and laying method capable of extending service lifetime of RH ladle working lining - Google Patents

Building and laying method capable of extending service lifetime of RH ladle working lining Download PDF

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Publication number
CN101412109B
CN101412109B CN2008101592881A CN200810159288A CN101412109B CN 101412109 B CN101412109 B CN 101412109B CN 2008101592881 A CN2008101592881 A CN 2008101592881A CN 200810159288 A CN200810159288 A CN 200810159288A CN 101412109 B CN101412109 B CN 101412109B
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China
Prior art keywords
laying
line
slag line
magnesia carbon
working lining
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CN2008101592881A
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Chinese (zh)
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CN101412109A (en
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吕铭
武光君
王学新
李洪建
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Shandong Iron and Steel Co Ltd
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Laiwu Iron and Steel Co Ltd
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Abstract

The invention relates to a repairing method capable of prolonging the service life of an RH ladle working lining, which comprises the following steps: an off-line minor repair for the first time, an off-line medium repair for the second time, an off-line minor repair for the third time, and an off-line heavy repair for the fourth time. When the eroded defect thickness of 2 to 3 layers of magnesia carbon bricks on the lower part of a ladle lining slag line is 10 to 20 millimeters larger than the smallest replaceable defect thickness, the minor repairs for the first and the third times are performed; and when the slag line of the working lining erodes to the smallest defect thickness for exceeding 0 to 10 millimeters, the medium repair for the second time and the heavy repair for the fourth time are performed. The method performs the planned repairs through reasonably controlling the eroded defect thickness of the ladle working lining, and changes the repairing process of two times into four times, thus the service life of the ladle working lining is prolonged by more than one fold.

Description

The method of building by laying in a kind of RH of prolongation ladle working lining service life
Technical field
The present invention relates to the method for building by laying in a kind of RH of prolongation ladle working lining life-span, belong in the Ferrous Metallurgy RH refining ladle cylinder-packing and build by laying technical field.
Background technology
In recent years, for satisfying the technology controlling and process requirement of RH Development and Production mild steel, ultra-low-carbon steel, the RH ladle working lining must be carbon-free or the low-carbon (LC) cylinder-packing, is the cylinder-packing brick-building art that extensively adopts both at home and abroad at present and slag line adopts that low carbon magnesia carbon brick is built by laying bricks or stones, adopt corundum spinelle to water the integrated poured low-carbon (LC) cylinder-packing of material feeding at the bottom of Bao Bi and the bag.Because of the aim carbon of mild steel, ultra-low-carbon steel is controlled lower, molten steel, slag oxidisability are strong and put steel temperature height and aggravated the erosion that RH ladle working lining slag line magnesia carbon brick and Bao Bi water material feeding, cause the RH ladle working lining significantly to reduce service life, adopt traditional secondary to guarantee the repair free of charge and build technology (middle light maintenance 1 time, change at the bottom of slag line, pocket block, air brick, the repairing bag), the secondary bag is generally about 70 heats age.The RH ladle working lining is low service life, causes RH cylinder-packing refractory consumption rate and cost significantly to rise.Traditional working lining secondary is guaranteed the repair free of charge and is built technology and be, when the slag line magnesia carbon brick of new bag corrode Minimum Residual thick (using safely residual thick) or pocket block, when air brick reaches service limits, inactive, the light maintenance of must rolling off the production line.The residual thick control of this cylinder-packing and build by laying technology, safe application performance is low, easily have an accident, gently then magnesia carbon brick with water material feeding binding site generation drill steel accident, heavy then cylinder-packing takes place wear the bag accident.Be that the RH ladle working lining adopts traditional cylinder-packing to build by laying technology, not only working lining is low service life, and coefficient safe in utilization is low.
Summary of the invention
Build by laying the defective of technology for overcoming existing RH ladle working lining, the invention provides a kind of reasonable control ladle working lining and corrode residual thick and plan and build by laying the method for maintenance,, improve the safe application performance of cylinder-packing simultaneously to prolong the service life of RH ladle working lining.
Term explanation: cylinder-packing corrodes that Minimum Residual is thick promptly to be used safely residual thickly, is generally 50mm; The cylinder-packing slag line corrode minimum replaceable residual thick be 1/2 of former slag line thickness.
Summary of the invention: the present invention builds by laying technology by traditional secondary and changes four times into and build by laying technology, when 2~3 layers of magnesia carbon brick in cylinder-packing slag line bottom corrode residual thickly during greater than the replaceable residual thick 10~20mm of minimum, implements the 1st, 3 light maintenance; When the working lining slag line corrodes residual thickly when surpassing the thick 0~10mm of Minimum Residual, implement to repair and the 4th overhaul in the 2nd time.
Detailed Description Of The Invention:
The method of building by laying in a kind of RH of prolongation ladle working lining service life, step is as follows:
1) the 1st light maintenance of rolling off the production line:, implement the 1st light maintenance when 2~3 layers of magnesia carbon brick height in cylinder-packing slag line bottom corrode residual thickly during greater than the replaceable residual thick 10~20mm of minimum.The method of building by laying is, 2~3 layers of magnesia carbon brick in slag line bottom are not torn open, and local replacing slag line magnesia carbon brick is changed at the bottom of pocket block, air brick, the repairing bag.Wherein, slag line magnesia carbon brick reduced thickness 20mm.
2) repair in rolling off the production line for the 2nd time: when the working lining slag line corrodes that Minimum Residual is thick to surpass 0~10mm, repair in implementing to roll off the production line for the 2nd time.The method of building by laying is that the slag line magnesia carbon brick is torn open entirely, changed, and overlaps after the Bao Bi and the bag end strip off the skin and waters, and changes pocket block, air brick.
3) the 3rd light maintenance of rolling off the production line:, implement the 3rd light maintenance of rolling off the production line when 2~3 layers of magnesia carbon brick height in cylinder-packing slag line bottom corrode residual thickly for greater than the replaceable residual thick 10~20mm of minimum the time.The method of building by laying is, 2~3 layers of magnesia carbon brick in slag line bottom are not torn open, and local replacing slag line magnesia carbon brick is changed at the bottom of pocket block, air brick, the repairing bag.Wherein, slag line magnesia carbon brick reduced thickness 20mm.
4) the 4th overhaul of rolling off the production line: when the working lining slag line corrodes that Minimum Residual is thick to surpass 0~10mm, implement the 4th overhaul of rolling off the production line.The method of building by laying is, working lining is torn open entirely, builds by laying by new bag brick-building art, promptly again at the bottom of pouring ladle wall and the bag, new pocket block, air brick are installed and are built by laying bricks or stones new slag line.
The present invention is corroded residual thickly under equal process conditions by reasonable control ladle working lining, implementation plan is built by laying, and builds by laying technology by secondary and changes four times into and build by laying technology, can prolong ladle working lining service life more than 1 times.
Description of drawings
Fig. 1 is the ladle wall structural representation.Fig. 2 is pocket block at the bottom of the ladle bag, air brick installation site schematic diagram.Wherein, 1, working lining slag line magnesia carbon brick, 2, working lining bag wall waters material feeding, 3, the material feeding of working lining bag bottom pour mold, 4, permanent liner, 5, pocket block, 6, air brick.
The specific embodiment
The invention will be further described below in conjunction with specific embodiment, but be not limited thereto.
Embodiment:
The present invention is successfully on probation on 130 tons of RH ladles of Laiwu iron and steel group silver mountain shaped steel Co., Ltd steel mill.In December, 2007, the 1#RH refining furnace was gone into operation, for solving the big and molten steel recarburization problem of RH processing procedure molten steel temperature drop, 130 tons of ladle liners are built by laying bricks or stones by full magnesia carbon brick and changed into: slag line is a magnesia carbon brick, thickness 220mm, it is integrated poured that Bao Bi, the bag end adopt corundum spinelle to water material feeding, wherein wrap wall thickness 200mm, bag base thickness degree 350mm.Adopt traditional secondary to guarantee the repair free of charge and build technology (middle light maintenance 1 time is changed at the bottom of slag line, pocket block, air brick, the repairing bag), cylinder-packing Minimum Residual thick (safe handling thickness) is 50mm, secondary bag heat average lives 71.Water at secondary slag inclusion line magnesium-carbon brick and Bao Bi that the material feeding binding site repeatedly oozes steel and slag line is worn the steel accident.Begin in June, 2008, adopt the present invention to control ladle working lining and corrode residual thick and plan and build by laying the method for maintenance, cylinder-packing reaches more than 150 heats average life, uses so far, the cylinder-packing drill steel not taking place and wear the steel accident, has improved the safe application performance of cylinder-packing.It is as follows specifically to build by laying technology:
1) the 1st plan roll off the production line, light maintenance: when cylinder-packing slag line bottom (2~3 layers of magnesia carbon brick height) corrodes the residual thick 130~140mm of being, just plan is rolled off the production line and is implemented the 1st light maintenance.The method of building by laying is 2~3 layers of magnesia carbon brick height in slag line bottom) corrode residual thick be 130~140mm, just plan is rolled off the production line and is implemented the 1st light maintenance.The method of building by laying is, the following 3 layers of magnesia carbon brick of slag line are not torn open, and local replacing slag line magnesia carbon brick is changed at the bottom of pocket block, air brick, the repairing bag.Wherein, slag line magnesia carbon brick reduced thickness is to 200mm.
2) the 2nd plan roll off the production line, in repair: when the working lining slag line corrodes the residual thick 50~60mm of being, plan is repaiied in rolling off the production line and implementing to roll off the production line for the 2nd time.The method of building by laying is the cover casting ladle wall and the bag end, to change pocket block, air brick.
3) the 3rd plan roll off the production line, light maintenance: when cylinder-packing slag line bottom (2~3 layers of magnesia carbon brick height) corrodes the residual thick 130~140mm of being, just plan is rolled off the production line and is implemented the 3rd light maintenance.The method of building by laying is, the method for building by laying is, 2~3 layers of magnesia carbon brick in slag line bottom are not torn open, and local replacing slag line magnesia carbon brick is changed at the bottom of pocket block, air brick, the repairing bag.Slag line magnesia carbon brick reduced thickness is to 200mm.
4) the 4th plan roll off the production line, overhaul: when the working lining slag line corrodes the residual thick 50~60mm of being, plan is rolled off the production line and is implemented the 4th overhaul of rolling off the production line.The method of building by laying is, working lining is torn open entirely, builds by laying by new bag brick-building art, promptly again at the bottom of pouring ladle wall and the bag, new pocket block, air brick are installed and are built by laying bricks or stones new slag line.

Claims (1)

1. one kind can prolong the RH ladle working lining method of building by laying in service life, it is characterized in that step is as follows:
1) the 1st light maintenance of rolling off the production line:, implement the 1st light maintenance when 2~3 layers of magnesia carbon brick height in cylinder-packing slag line bottom corrode residual thickly during greater than the replaceable residual thick 10mm of minimum; The method of building by laying is, 2~3 layers of magnesia carbon brick in slag line bottom are not torn open, and local replacing slag line magnesia carbon brick is changed at the bottom of pocket block, air brick, the repairing bag; Wherein, slag line magnesia carbon brick reduced thickness 20mm;
2) repair in rolling off the production line for the 2nd time:, repair in implementing to roll off the production line for the 2nd time when the working lining slag line corrodes Minimum Residual when thick; The method of building by laying is that the slag line magnesia carbon brick is torn open entirely, changed, and overlaps after the Bao Bi and the bag end strip off the skin and waters, and changes pocket block, air brick;
3) the 3rd light maintenance of rolling off the production line:, implement the 3rd light maintenance of rolling off the production line when 2~3 layers of magnesia carbon brick height in cylinder-packing slag line bottom corrode residual thickly for greater than the replaceable residual thick 10mm of minimum the time; The method of building by laying is, 2~3 layers of magnesia carbon brick in slag line bottom are not torn open, and local replacing slag line magnesia carbon brick is changed at the bottom of pocket block, air brick, the repairing bag; Wherein, slag line magnesia carbon brick reduced thickness 20mm;
4) the 4th overhaul of rolling off the production line: when the working lining slag line corrodes Minimum Residual when thick, implement the 4th overhaul of rolling off the production line; The method of building by laying is, working lining is torn open entirely, builds by laying by new bag brick-building art, promptly again at the bottom of pouring ladle wall and the bag, new pocket block, air brick are installed and are built by laying bricks or stones new slag line.
CN2008101592881A 2008-11-27 2008-11-27 Building and laying method capable of extending service lifetime of RH ladle working lining Expired - Fee Related CN101412109B (en)

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CN101412109B true CN101412109B (en) 2010-07-14

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102019417B (en) * 2010-11-17 2012-10-03 山东钢铁股份有限公司 Method for building steel ladle pouring working lining
CN102274957A (en) * 2011-08-05 2011-12-14 莱芜钢铁集团有限公司 Steel ladle
CN103736985B (en) * 2014-01-11 2016-06-08 莱芜钢铁集团有限公司 A kind of ladle working lining and slag lining thereof build by laying method
CN104759611B (en) * 2015-04-22 2017-01-04 山东钢铁股份有限公司 What a kind of ladle was combined working lining and slag lining thereof builds by laying method
CN106312035B (en) * 2016-09-30 2018-08-21 北京利尔高温材料股份有限公司 A kind of repairing method of ladle slag line position circumferential weld
CN106424692A (en) * 2016-10-26 2017-02-22 舞阳钢铁有限责任公司 Constructing and repairing method for minor repair or mend of steel ladle of electric furnace
CN110567274B (en) * 2019-08-30 2021-01-26 楚雄滇中有色金属有限责任公司 Digging and repairing method for sidewall of impoverishment furnace
CN110523966A (en) * 2019-09-25 2019-12-03 张家港广大特材股份有限公司 A kind of double porous cores of ladle
CN111618284A (en) * 2020-05-12 2020-09-04 浙江自立高温科技股份有限公司 Method for repairing working lining of ladle wall

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