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Maintenance method for converter lining

A converter lining and converter technology, applied in the manufacture of converters, etc., can solve problems affecting the service life of converters and maintenance costs, casting machine flocculation or alarm accidents, difficulty in converting converter slag, etc., to achieve convenient and rapid maintenance of furnace lining, The effect of shortening the repairing time and improving the working efficiency

Inactive Publication Date: 2016-06-15
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the erosion of the furnace lining is uneven. At present, the most severely eroded part of the furnace lining is the slag surface. The furnace lining bricks peel off and the molten steel, slag and furnace gas scour the furnace lining. At the same time, it also has to withstand the molten iron scour when adding molten iron and the mechanical impact when adding scrap steel. Therefore, the slag pouring surface is an important part that affects the service life and maintenance costs of the converter. It is also the key maintenance part of the furnace lining. In order to ensure the safe and stable operation of the converter and avoid production shutdown due to excessive local erosion of the slag pouring surface, it is necessary to adopt special methods to strengthen maintenance in order to achieve balanced erosion of the furnace lining.
[0003] The traditional method of maintaining the slag dumping surface in the prior art is furnace repairing method, which takes a long time and is low in efficiency. In the first furnace, converter slag is difficult to slag, molten steel inclusions increase, and casting machines often have flocculation or alarm accidents

Method used

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  • Maintenance method for converter lining
  • Maintenance method for converter lining
  • Maintenance method for converter lining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Taking 120t converter iron lump slag repairing furnace as an example in a certain factory

[0037] A maintenance method for a converter lining, comprising the following steps:

[0038] 1) Prepare 3 tons of dry and clean iron blocks in advance;

[0039] 2) The end point of the converter is as follows: in the previous furnace for repairing, the temperature at the end point of tapping is controlled at 1647°C, and the oxygen at the end point is 289ppm; the composition of the final slag is 42.4% CaO, SiO 2 content of 12.8%, MgO content of 11.2%, TFe content of 14.9%, P 2 o 5 The content is 2.25%, the other content is 16.45%, and the alkalinity is 3.3;

[0040] 3) After removing the clean steel, adjust the viscosity of the slag by splashing slag to protect the furnace. After 2 minutes of slag splashing, the viscosity is suitable;

[0041] 4) Retain about 5t of slag when pouring slag;

[0042] 5) Take the vertical upward position of the converter mouth as the 0° position,...

Embodiment 2

[0048] Take the 120t converter iron lump slag mending furnace as an example.

[0049] A maintenance method for a converter lining, comprising the following steps:

[0050] 1) In the previous furnace of the refurbishment, the temperature at the end point of tapping is controlled at 1640°C, and the oxygen at the end point of the converter is controlled at 350ppm, so that the steel is completely tapped;

[0051] 2) Control the final slag composition of the converter. After the clean steel is produced, keep 5.5% of the slag in the furnace, and adjust the viscosity of the slag by splashing the slag to protect the furnace. After 2 minutes of slag splashing, the viscosity is suitable; 2 content of 13.5%, MgO content of 11%, TFe content of 21.9%, P 2 o 5 The content is 1.89%, the other content is 11.21%, and the alkalinity is 3.0;

[0052] 3) Pour the dry and impurity-free iron nuggets prepared in advance for repairing the furnace evenly into the severely eroded part of the slag pour...

Embodiment 3

[0059] Take 120t converter iron lump slag mending furnace as an example.

[0060] A maintenance method for a converter lining, comprising the following steps:

[0061] 1) In the previous furnace of the refurbishment, the temperature at the end of tapping is controlled at 1650°C, and the oxygen at the end of the converter is controlled at 350ppm, so that the steel is completely tapped;

[0062] 2) Control the final slag composition of the converter. After the clean steel is produced, keep 6 tons of slag in the furnace, and adjust the viscosity of the slag by splashing slag to protect the furnace. After 2 minutes of slag splashing, the viscosity is suitable; 2 content of 11.5%, MgO content of 8.8%, TFe content of 10.3%, P 2 o 5 The content is 3.01%, the alkalinity is 3.85, and the other content is 20.09%;

[0063] 3) Pour the dry and impurity-free iron nuggets prepared in advance for repairing the furnace evenly into the severely eroded part of the slag pouring surface in the...

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Abstract

The invention discloses a maintenance method for a converter lining. The maintenance method comprises the following steps: 1. in a last furnace before fettling, controlling steel tapping terminal temperature at 1640-1650 DEG C, controlling converter terminal oxygen to be below 350ppm, and discharging all steel; 2. adjusting converter final slag components, remaining slag in the furnace, and adjusting slag viscosity to reach proper viscosity after slag splashing; 3. pouring briquettes to a part with serious erosion of a slag pouring plane in the converter, cooling and condensing the slag and the briquettes together and then attaching the slag and the briquettes to the surface of the lining together, and when the briquettes are poured, first shaking the converter to the position of 50 degrees, and shaking the furnace downwards while adding the briquettes; 4. after the briquettes are poured, shaking the converter in the scope of 45-100 degrees, and shaking the converter to be flat after the briquettes are totally immersed to the slag; 5. in the first furnace after fettling, adding ores in the medium stage of decarburizing reaction, and carrying out converter protection with slag splashing after steel tapping. The maintenance method is low in manufacture and use cost and high in efficiency, can ensure the quality of molten steel in subsequent production, can be used for conveniently and quickly maintaining the converter lining, and can achieve the purpose of lowering the production cost of steel works.

Description

technical field [0001] The invention relates to the technical field of metallurgical equipment and technology, in particular to a method for maintaining the lining of a converter. Background technique [0002] The converters in the prior art generally use slag splashing to protect the furnace lining to maintain the furnace lining, so that the furnace life of the converter has been greatly increased, reaching an average of more than 13,000 furnaces. However, the erosion of the furnace lining is uneven. At present, the most severely eroded part of the furnace lining is the slag surface. The furnace lining bricks peel off and the molten steel, slag and furnace gas scour the furnace lining. At the same time, it also has to withstand the molten iron scour when adding molten iron and the mechanical impact when adding scrap steel. Therefore, the slag pouring surface is an important part that affects the service life and maintenance costs of the converter. It is also the key mainte...

Claims

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Application Information

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IPC IPC(8): C21C5/44C21C5/36
CPCC21C5/443C21C5/36
Inventor 刘效森王念欣尚玉民张吉磊贾崇雪于海燕苗振鲁赵志洪张本源李兴彬
Owner SHANDONG IRON & STEEL CO LTD
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