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Oxygen blowing method for 120t converter

A converter and oxygen lance technology, applied in the manufacture of converters, etc., can solve the problems of poor slag removal effect, high strength of bottom blowing gas supply, and insufficient effect of bottom blowing dephosphorization, etc., so as to reduce oxygen consumption, The effect of shortening the total oxygen supply time

Inactive Publication Date: 2012-05-02
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The 120t converter uses a 5-hole oxygen lance, but the penetrating power of the 5-hole oxygen lance is relatively strong, and the gas supply intensity of the bottom blowing is relatively high, resulting in low FeO in the slag, poor slag melting effect, and insufficient bottom blowing dephosphorization effect to play
Therefore, a suitable oxygen lance must be selected additionally

Method used

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  • Oxygen blowing method for 120t converter

Examples

Experimental program
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Effect test

Embodiment

[0017] The converter replaced the original 5-hole oxygen lance with a 6-hole oxygen lance. Aiming at Baotou Steel's furnace charge structure, after nearly a year of exploring the process parameters, a good use effect has been obtained.

Embodiment approach 1

[0019] The raw material conditions are: 93.2t molten iron + 17.6t scrap iron and steel material. The composition of the molten iron is shown in Table 3.

[0020] Table 3 Composition of molten iron, w%

[0021] C

Si

mn

P

S

4.3

0.62

0.36

0.082

0.046

[0022] The operation to be taken is: in different stages of smelting, the operation mode of constant pressure variable lance (meaning that the height of the oxygen lance from the surface of the molten pool is changing) is adopted. The Mach number of the gas flow through the oxygen lance is 2.0, the pressure value used is 0.91Mpa, and the oxygen flow rate is 20000m 3 / h.

[0023] Initial stage of smelting: The ratio of the penetration depth of the oxygen jet to the depth of the molten steel pool is 0.60, and the height range from the oxygen lance to the molten pool is 1.7m.

[0024] Middle stage of smelting: The ratio of the penetration depth of the oxygen jet...

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Abstract

The invention discloses an oxygen blowing method for a 120t converter. The oxygen blowing method is characterized in that a six-hole high-flow oxygen lance is used and has the throat diameter of 26.47mm, outlet diameter of 34.68mm and opening angle of 12.5 degrees; the mach number passing through the air current of the oxygen lance is selected to be 2.0-2.1; the used pressure value is 0.91-0.93Mpa; the oxygen flow is 20000-22000m<3> / h; the ratio of the penetration depth of oxygen jet to the depth of a molten pool for molten steel is 0.50-0.70; and the height from the oxygen lance to the molten pool ranges from 1.3m to 1.9m. The oxygen blowing method has the advantages that the total oxygen supplying time of the oxygen lance is averagely shortened by 1.5 minutes; and the total oxygen consumption of steel of each converter is averagely reduced by 429m<3>.

Description

technical field [0001] The invention relates to an oxygen blowing method for a 120t converter, belonging to the field of steelmaking produced in the metallurgical industry. Background technique [0002] Reasonable selection of oxygen lance is crucial to converter smelting, and different oxygen lances are usually selected for converters in different steel mills. For example, "Steel Research" reported in June 2007 (page 52, No. 3, Volume 35) that a 120t converter of Anyang Iron and Steel Company used a 5-hole oxygen lance. "Metallurgical Energy" in July 2009 (Volume 28, Issue 4, Page 19) reported that a 260t converter in Anshan Iron and Steel Company used 6-hole oxygen lances. "Metallurgical Energy" in November 2010 (Volume 29, Issue 6, Page 11) reported that a 150t converter in Nanjing Iron and Steel Company used a 5-hole oxygen lance. "Metallurgical Energy" in November 2010 (Volume 29, Issue 6, Page 13) reported that a 210t converter in Jinan Iron and Steel Company used a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30
Inventor 李峰赵明泉
Owner INNER MONGOLIA BAOTOU STEEL UNION
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