A method for repairing the circular seam of the ladle slag line

A ladle slag line and ring seam technology, which is applied in the field of iron and steel metallurgical ladle lining repair, can solve the problems of slag line brick waste, heavy workload, and troublesome operation, so as to reduce the consumption of refractory materials per ton of steel and increase the continuous service life Effect

Active Publication Date: 2018-08-21
北京利尔高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the workload of re-laying is heavy and the operation is troublesome. Since the complete slag line bricks above the ring joint are also removed, the waste of slag line bricks is caused.

Method used

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  • A method for repairing the circular seam of the ladle slag line
  • A method for repairing the circular seam of the ladle slag line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment is a 120t cord steel ladle, high-carbon magnesia-carbon bricks are used for the working lining of the ladle slag line, and low-carbon magnesia-carbon bricks are used for the working lining of the ladle wall. The length of the brick is 170, the thickness is 100, the size deviation of the ladle brick is ±1mm, the width of the brick joint is not more than 1mm, and the number of furnaces used in this overhaul package is about 35 furnaces, the refining method is mainly LF, and the ladle is offline for minor repairs. It is obvious that there is a deep groove at the slag liquid level, and other parts are in good condition; the minimum residual thickness h=100mm allowed for the circular joint, the specific repair steps are as follows:

[0041]1) The residual thickness of the slag line brick and sealing brick on the upper part of the ladle is ≥150mm, and the thickness of the thinnest part of the circular joint is h1≥100mm. The mud should be mixed with water accor...

Embodiment 2

[0049] This example is a 180t ordinary carbon steel ladle. High-carbon magnesia-carbon bricks are used for the working lining of the slag line of the ladle. The working lining of the ladle wall is aluminum-magnesia-carbon bricks. The length is 200, the thickness is 100, the size deviation of ladle bricks is ±1mm, the allowed brick joint width is not more than 1mm, and the number of furnaces used for this overhaul package is about 40 furnaces, the refining method is mainly LF, and minor repairs can be obvious when the ladle is offline It can be seen that there is a deep groove on the slag liquid surface, and other parts are in good condition; the minimum residual thickness allowed by the circular joint is h=120mm, and the specific repair steps are as follows:

[0050] 1) The residual thickness of the slag line brick and sealing brick on the upper part of the ladle is ≥150mm, and the thickness of the thinnest part of the circular joint is h1≥120mm. This repair is mainly carried o...

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Abstract

The invention relates to a repair mode for a circumferential weld in a ladle slag line part. The minimum residual thickness permitted by a circumferential weld is h, the residual thickness of a slag line brick on the upper part of the circumferential weld is greater than or equal to 150mm, and the thinnest part of the circumferential weld is opened and the thickness h1 is measured first; if h1 is greater than or equal to h, smearing repair is adopted; if h1 is smaller than h, repair is performed by adopting a mending method by replacing a damaged part; the mending method by replacing the damaged part comprises the following steps of: S1, removing the part of the circumferential weld, the thickness of which is smaller than h, along the circumferential weld, and in the removing process, setting a plurality of pivot points between upper available bricks and lower available bricks; S2, thoroughly cleaning and smoothly modifying the lower surfaces of the upper available bricks and the upper surfaces of the lower available bricks; S3, performing bricklaying by using repair bricks; S4, closing the circumferential weld; and S5, baking the repaired ladles according to a bake curve which is slightly modified for later use. According to the repair mode provided by the invention, the circumferential weld part is only removed and repaired, so that the integral structure of a ladle refractory material is retained to the maximum extent, and therefore, the consumption of the ladle refractory material of steel per ton is reduced, and the repair mode is energy-saving, low-carbon and environmental-friendly.

Description

technical field [0001] The invention relates to a technology for repairing the inner lining of a ladle in iron and steel metallurgy, in particular to a method for repairing the circular seam at the slag line of the ladle. Background technique [0002] With the continuous improvement of people's lives, the quality of traditional steel can no longer meet certain performance. In order to obtain better varieties of steel, it is forced to change the ladle refining technology. Therefore, various out-of-furnace refining methods such as LF, RH, CAS, and VOD have emerged as the times require. pregnancy. At the present stage, the aim is to improve the refining efficiency, realize optimal combination and complementary functions, and superimpose multiple refining methods, so higher requirements are put forward for the service life of the ladle working lining. At present, the slag line of the ladle is mainly made of magnesia-carbon bricks, and the main wall of the ladle is made of alumi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/02
CPCB22D41/023
Inventor 刘靖轩朱力舟赵伟刘丽李朝云任林曹仁锋赵现华王次明胡玲军赵传亮滕国强赵冉张盛徐业兴张晗郭钰龙
Owner 北京利尔高温材料股份有限公司
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