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A method of heat preservation of molten iron in a ladle refining furnace

A ladle refining furnace and refining furnace technology, applied in the field of metallurgy, can solve the problems of passive production, affecting the normal turnover of molten iron ladle, cooling molten iron, etc., and achieve the effects of cost reduction, avoiding failure to turn over and occupying site space, and reducing turnover of iron ladle

Active Publication Date: 2018-10-16
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problem that the ladle time of molten iron is longer than 16 hours, which will cause the molten iron to cool down to solidification and cannot be processed, and more importantly, it may affect the normal turnover of the ladle and cause subsequent production to be passive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The first ladle of molten iron held in the 2#LF furnace is as follows:

[0026] After the molten iron enters the LF station, the temperature is 1231°C, 1.2kg / ton of submerged arc slag and slagging agent are added from the silo, and the 8-speed long arc is used for heating for 9 minutes, the gas supply intensity of the bottom blowing is 300 NL / min, and the temperature measurement is 1256°C , with an average temperature rise of 2.8°C / min, and adding submerged arc slag 1.6kg / ton hot metal and lime 7.5kg / ton hot metal, adopting the 4th gear to raise the temperature for 9 minutes, measuring the temperature at 1302°C, and then raising the temperature for 4 minutes, measuring the temperature at 1326°C, opening and adding heat preservation Agent (carbonized rice husk) 1.0kg / ton of molten iron. After an interval of 90 minutes, the temperature dropped to 37°C, and then divided into two times (8+5) minutes to raise the temperature. After that, every 110 minutes, heated for 13 minu...

Embodiment 2

[0028] The situation of the second ladle of molten iron held in the 2#LF furnace is as follows:

[0029] After the molten iron enters the LF station, the temperature is 1223°C, 1.5kg / ton of submerged arc slag and slagging agent are added from the silo, and the 6-speed long arc is used for heating for 9 minutes, the gas supply intensity of the bottom blowing is 400 NL / min, and the temperature measurement is 1246°C , with an average temperature rise of 2.6°C / min, adding 1.5kg / ton of submerged arc slag and 8.0kg / ton of lime molten iron, and raising the temperature for 10 minutes at 4 levels, measuring the temperature at 1288°C, and then raising the temperature for 10 minutes, measuring the temperature at 1317°C, and adding heat preservation agent (covering agent) 0.5kg / ton of molten iron; after an interval of 120 minutes, the temperature will drop by 34°C, and then the temperature will be raised in two (8+5) minutes. In each 140 minutes, heat for 13 minutes, stir for 7 minutes, an...

Embodiment 3

[0031] The first ladle of molten iron held in 1#LF furnace is as follows:

[0032] The arrival temperature of molten iron is 1266°C. Add 2.0kg / ton of submerged arc slag and slag-removing agent from the silo, use 8-speed long-arc heating for 9 minutes, bottom blowing gas supply intensity is 500 NL / min, temperature measurement is 1293°C, and the average temperature rise 3°C / min, add submerged arc slag 1.0kg / ton molten iron and lime 9.0kg / ton molten iron, increase the temperature for 7 minutes at 4 levels, measure the temperature at 1329°C, add thermal insulation agent (covering agent) 0.8kg / ton molten iron, interval After 100 minutes, the temperature dropped to 37°C, and then the temperature was raised twice for (8+7) minutes. After that, every 120 minutes, it was heated for 15 minutes, stirred for 5 minutes, and the interval was 100 minutes. Repeatedly, the final exit temperature was 1329°C. Bag.

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Abstract

The invention discloses a heat preservation method for molten iron in a ladle refining (LF) furnace. The heat preservation method comprises the following steps of (1) putting of molten iron into the LF; (2) temperature measurement and increasement; (3) arc submerging; (4) heating and iron adding and (5) ladle confirmation. According to the heat preservation method, on the premise that molten iron cannot return for treatment, the molten iron is transferred into a ladle, the ladle loaded with the molten iron is subjected to heat preservation operation in the refining furnace through a ladle bottom blowing system, and after a converter system restores, the molten iron subjected to heat preservation is added into a converter for normal smelting. By adoption of the heat preservation method, the problem that when the converter system is abnormal during production, the molten iron is kept in an iron ladle for a long time and cannot be treated is solved, and the problem that ladle lumps are formed in the iron ladle due to long-time ladle keeping is solved. By adoption of the heat preservation method, molten iron loss is reduced, and the problems that a ladle shell of the iron ladle is affected and cannot be transferred, and an on-site space is occupied are solved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for keeping molten iron warm in a ladle refining furnace. technical background [0002] With the continuous upgrading of the quality of iron and steel products, various refining furnaces are playing an increasingly important role in the steelmaking area, and the mixed iron furnaces between ironmaking and steelmaking are gradually withdrawn from the steelmaking area. Currently, most of them use molten iron tanks Or the torpedo tank is responsible for the storage of molten iron. When the converter system fails during the production process, there is usually molten iron in front of the converter, molten steel in the back, or even poured molten steel back into the furnace. In terms of molten steel, the refining furnace can usually be used for heat preservation or it can be cast into slabs after continuous casting; and molten iron usually needs to add a large a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00
CPCC21C7/0075
Inventor 刘玉伟刘伟王宝华孔超高建国周艳群
Owner HEBEI IRON AND STEEL