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Method for controlling furnace bottom by adding ferro-silicon

A technology for controlling furnace and furnace bottom, applied in the direction of manufacturing converters, etc., can solve problems such as slag running, corrosion of missing parts of furnace lining balls, etc., and achieve the effects of reduced smelting time, good slag in the furnace, and stable dephosphorization effect.

Inactive Publication Date: 2010-01-06
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the height of the furnace bottom is lower than 200cm, the corroded part of the furnace lining spherical part is serious, and when the height of the furnace bottom is higher than 260cm, it is easy to appear the phenomenon of slag running during the smelting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] This embodiment is aimed at the furnace bottom control of a 200-300 ton converter. The method of adding ferrosilicon while blowing oxygen into the furnace can quickly control the bottom height of the top and bottom combined blowing converter, and can increase the bottom height of the top and bottom combined blowing converter. It is stable at around 200cm, which ensures the smelting effect. The specific operation method is as follows:

[0010] 1) The slag splashing operation is carried out before the bottom of the furnace, and the slag is poured out when the slag is poured out;

[0011] 2) The position of the gun is 100cm, and the flow rate of the oxygen gun is 15000-20000Nm 3 / h, duration 90S; gun position at 100cm, oxygen gun flow 30000-50000Nm 3 / h, duration 30S; gun position at 80cm, oxygen gun flow 30000-50000Nm 3 / h, duration 30S;

[0012] 3) The amount of ferrosilicon added is 200-400Kg, and the silicon content of ferrosilicon is 72-78%.

Embodiment 2

[0014] This embodiment is aimed at the furnace bottom control of a 150-200 ton converter. The method of adding ferrosilicon while blowing oxygen into the furnace can quickly control the bottom height of the top and bottom double blowing converter, and can increase the bottom height of the top and bottom double blowing converter. It is stable at around 200cm, which ensures the smelting effect. The specific operation method is as follows:

[0015] 1) The slag splashing operation is carried out before the bottom of the furnace, and the slag is poured out when the slag is poured out;

[0016] 2) The position of the gun is 100cm, and the flow rate of the oxygen gun is 8000-15000Nm 3 / h, duration 90S; gun position at 100cm, oxygen gun flow 15000-30000Nm 3 / h, duration 30S; gun position at 80cm, oxygen gun flow 15000-30000Nm 3 / h, duration 30S;

[0017] 3) The amount of ferrosilicon added is 150-200Kg, and the silicon content of ferrosilicon is 72-78%.

[0018] For other types o...

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PUM

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Abstract

The invention relates to a method for controlling a furnace bottom by adding ferro-silicon, which adopts a mode of adding the ferro-silicon while blowing oxygen into a furnace to control the height of the furnace bottom of a combined blowing converter. Compared with the prior art, the method has the advantage of ensuring the existence of a bottom gun of the combined blowing converter to achieve stable converting effect. Taking a 250-ton top-bottom combined blowing converter as an example, the furnace bottom height BL value is stably controlled to be about 200 centimeters, thus the smelting effect of the top-bottom combined blowing converter is ensured, the smelting time of the converter is reduced by 1.5 minutes, the slugging in the converter is good, the dephosphorizing effect is stable, and the final phosphorus content is less than 150 ppm and accounts for 98 percent.

Description

technical field [0001] The invention relates to a method for controlling furnace bottom height in the metallurgical industry. Background technique [0002] The furnace bottom height of the top-bottom combined blowing converter needs to be controlled due to the existence of the bottom gun, and the large fluctuation of the furnace bottom height has a negative impact on the slag control and furnace maintenance of the converter during the smelting process. The height of the furnace bottom is controlled at 200cm-220cm, which is ideal for smelting operations and furnace body maintenance. When the height of the furnace bottom is lower than 200cm, the spherical part of the furnace lining is severely corroded, and when the height of the furnace bottom is higher than 260cm, the phenomenon of slag running during the smelting process is prone to occur. [0003] Therefore, it is necessary to control the furnace bottom height of the combined blowing converter to achieve a stable smelting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30
Inventor 田文革张志文张越宋广钢王鹏飞于晖赵增强
Owner ANGANG STEEL CO LTD
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