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A Furnace Protection Method to Guarantee High Life of Converter

A converter and life-span technology, applied in the manufacture of converters and other directions, can solve the problem of difficult to guarantee the smelting of steel varieties, and achieve the effects of avoiding vicious furnace opening accidents, improving gas supply strength, and reducing the total amount

Active Publication Date: 2019-03-05
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Comprehensively adopting the above-mentioned traditional furnace protection methods can usually ensure that the furnace life of the converter is about 15,000 furnaces for the converters that smelt and produce common steel types with high efficiency and low cost. , especially the high lifespan of the converters that often continuously produce a large proportion of low-carbon and low-phosphorus steels

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment is a furnace protection method to ensure the high life of the converter. The proportion of low-phosphorus and low-carbon steel grades smelted by the converter accounts for more than 30% of the total. The molten steel at the end of the converter smelting is low-carbon and low-phosphorus. The weight percentage of carbon and phosphorus is: ]≤0.04%, low phosphorus: [P]≤0.01%; high phosphorus in the molten iron fed into the converter, the weight percentage of phosphorus is: [P]≥0.12%;

[0023] The furnace protection method of the present embodiment comprises the following steps:

[0024] (1) When building a new furnace in the converter, high-strength refractory bricks are used for the lining of the large surface of the converter at an angle of 45° directly in front of the converter, and then the lining of the large surface and the lining on both sides of the trunnion are built with scour-resistant refractory bricks; the high-strength refractory The weight per...

Embodiment 2

[0048] This embodiment is a furnace protection method to ensure the high life of the converter. The proportion of low-phosphorus and low-carbon steel grades smelted by the converter accounts for more than 30% of the total. The molten steel at the end of the converter smelting is low-carbon and low-phosphorus. The weight percentage of carbon and phosphorus is: ]≤0.04%, low phosphorus: [P]≤0.01%; high phosphorus in the molten iron fed into the converter, the weight percentage of phosphorus is: [P]≥0.12%;

[0049] The furnace protection method of the present embodiment comprises the following steps:

[0050] (1) When building a new furnace in the converter, high-strength refractory bricks are used for the lining of the large surface of the converter at an angle of 45° directly in front of the converter, and then the lining of the large surface and the lining on both sides of the trunnion are built with scour-resistant refractory bricks; the high-strength refractory The weight per...

Embodiment 3

[0054] This embodiment is a furnace protection method to ensure the high life of the converter. The proportion of low-phosphorus and low-carbon steel grades smelted by the converter accounts for more than 30% of the total. The molten steel at the end of the converter smelting is low-carbon and low-phosphorus. The weight percentage of carbon and phosphorus is: ]≤0.04%, low phosphorus: [P]≤0.01%; high phosphorus in molten iron fed into the converter, the weight percentage of phosphorus is: [P]≥0.12%;

[0055] The furnace protection method of the present embodiment comprises the following steps:

[0056] (1) When building a new furnace in the converter, high-strength refractory bricks are used for the lining of the large surface of the converter at an angle of 45° directly in front of the converter, and then the lining of the large surface and the lining on both sides of the trunnion are built with scour-resistant refractory bricks; the high-strength refractory The weight percent...

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Abstract

The invention provides a converter protecting method for ensuring the long service life of a converter. When a new converter is built by laying bricks, a converter lining within the 45-degree range of the positive front large face of the converter is built by laying high-strength firebricks, and then a converter lining of a rear large face and converter linings on the two sides of a trunnion are built by laying anti-scouring firebricks; and when the converter lining of the front large face of the converter is seriously corroded, liquid converter slag and firebrick broken materials are mixed in the converter, after being repeatedly and evenly shaken through the converter, a mixture is left on the front large face of the converter to be sintered, and after sintering, the front large face of the converter is coated with a formed magnesia-carbon brick-slag combined layer. According to the converter protecting method for ensuring the long service life of the converter, overall-process bottom blowing is ensured to avoid occurrence of a malignant poking accident; and meanwhile, slag gold reaction balance is improved to a great extent through stability of air-supplying strength of overall-process converter bottom blowing, and the oxygen content of terminal molten steel is lowered.

Description

technical field [0001] The invention relates to a method for protecting a converter, in particular to a converter smelting low-phosphorus and low-carbon steel whose proportion accounts for more than 30% of the total, where the molten steel at the end of converter smelting is low-carbon: [C]≤0.04%, and low-phosphorus: [P] ≤0.01%, high phosphorus in the molten iron into the converter: [P]≥0.12% and other conditions to ensure the high life of the converter furnace protection method. Background technique [0002] The current method of protecting the furnace lining of the converter is mainly based on the conditions of raw and auxiliary materials, such as: the composition of scrap steel (light waste, medium waste, medium waste, etc.), by adjusting the furnace loading sequence, adjusting the composition of molten steel and steel slag in converter smelting, and controlling converter smelting End point temperature, slag splashing to protect the furnace, etc. to achieve. The traditio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/44
CPCC21C5/441
Inventor 单以刚唐荆晶蔡可森周贺贺周桂成曹余良李强
Owner NANJING IRON & STEEL CO LTD
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