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Dephosphorization method for molten iron in converter by blowing dust removal ash

A converter and molten iron technology, applied in the direction of manufacturing converters, etc., can solve the problems of no relevant reports, secondary environmental pollution, etc., and achieve the effects of avoiding environmental pollution, improving the dephosphorization rate of molten iron, and efficient utilization.

Active Publication Date: 2015-02-18
BEIJING SHOUGANG INT ENG TECH
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Problems solved by technology

However, there are no relevant reports at home and abroad on the injection dephosphorization technology using oxygen lances to inject lime powder and dedusting ash.
[0003] Generally, the dust removal output of converter steelmaking reaches 20kg / t steel, if it is not comprehensively utilized and discarded, it will cause secondary pollution to the environment

Method used

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  • Dephosphorization method for molten iron in converter by blowing dust removal ash

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Embodiment Construction

[0024] specific implementation plan

[0025] The present invention will be further described below in conjunction with the example of dephosphorization of 300t converter blowing dedusting ash and accompanying drawings.

[0026] The present invention adopts following method to realize converter blowing dedusting ash dephosphorization process operation, as figure 1 As shown, the specific steps include:

[0027] (1) Hot metal preparation

[0028] In order to achieve a good dephosphorization effect, the requirements for the composition and temperature of the molten iron in the dephosphorization converter are shown in Table 1.

[0029] Table 1 Requirements for composition and temperature of molten iron fed into furnace by dephosphorization converter

[0030] C％

Si%

Mn%

P％

S％

temperature °C

3.9-5.0

≤0.35

0.08～0.50

≤0.12

≤0.07

≥1300

[0031] (2) Oxygen lance system preparation

[0032] The oxygen valve station of the...

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Abstract

The invention relates to a dephosphorization method for molten iron in a converter by blowing dust removal ash and belongs to the technical field of steelmaking. According to the dephosphorization process for dephosphorizing molten iron in the converter by blowing lime powder and dust removal ash through a dephosphorization oxygen lance, the device used in the dephosphorization process comprises an oxygen supply system and a powder blowing system; during the method, the oxygen supply system and the powder blowing system are adopted, the lime powder and dust removal ash are blown into a molten tank through the top-blowing dephosphorization oxygen lance, since the dust removal ash contains relatively high content of iron oxides, the content of ferric oxide in slag can be rapidly increased so as to promote the dissolution of lime and rapidly form slag having relatively high dephosphorization capability, the dephosphorization reaction is accelerated and meanwhile, the efficient utilization of the dust removal ash is achieved, the environmental secondary pollution due to the wastes is avoided and the dephosphorization method has relatively high economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for dephosphorizing molten iron by spraying and dust-removing ash in a converter. Background technique [0002] As an advanced converter dephosphorization process, the top injection method has been widely used in major steel mills in Japan. However, the domestic development is relatively late and the technology is still immature. Currently, only JISCO has introduced the converter injection dephosphorization process. In addition, the domestic invention patent "Converter Steelmaking Method Using Supersonic Oxygen Lance Powder Injection Dephosphorization and Supersonic Oxygen Lance" (Patent No.: CN102643946) discloses the use of converter oxygen lance to spray lime powder, fluorite, iron ore powder , Parameters of ferromanganese powder and supersonic oxygen lance structure. However, there are no relevant reports at home and abroad on the blowing dephosphori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C5/28C21C1/02
Inventor 黄云郭戌张国栋张德国
Owner BEIJING SHOUGANG INT ENG TECH
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