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A method for preventing dry dedusting system of semi-steel making converter from blowing and venting

A technology for dry dust removal and steelmaking converter, which is applied in the field of semi-steel steelmaking, can solve the problem of not fundamentally solving the problem of opening, blowing, and explosion of the dry dust removal process in semi-steel smelting, and achieves delaying carbon-oxygen reaction time, Simple process and the effect of reducing production costs

Active Publication Date: 2018-04-20
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] None of the existing methods fundamentally solves the problem of blowing and explosion in the dry dust removal process of semi-steel smelting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A steel factory smelts semi-steel on a 220t converter. Before smelting, the amount of ferrosilicon added to the semi-steel is determined according to the silicon and carbon content in the molten iron. Among them, the main element content of the molten iron and the temperature of the semi-steel are shown in Table 1:

[0032]

[0033] Because the carbon content in semi-steel water is more than 4.4%, and the silicon content is low, silicon is trace amount after vanadium extraction treatment, so the silicon content in molten iron can be ignored in later smelting; In the initial stage of steel, there is no need to add ferrosilicon. There is no need to increase the temperature of the semi-steel, which saves energy. At the same time, the number of blowing and venting in the final semi-steel dry dust removal system is 0 times.

Embodiment 2

[0035] A steel factory smelts semi-steel on a 220t converter. Before smelting, the amount of ferrosilicon added to the semi-steel is determined according to the silicon and carbon content in the molten iron. Among them, the main element content of the molten iron and the temperature of the semi-steel are shown in Table 2:

[0036]

[0037] Because the carbon content in the semi-steel water is 4.2%, the silicon content is low, and silicon is trace amount after the vanadium extraction treatment, so the silicon content in the molten iron can be ignored in the later smelting; therefore, in the initial stage of semi-steel steelmaking, 200kg of ferrosilicon . After silicon oxidation, the steelmaking temperature of the semi-steel is increased by 40°C, and there is no need to increase the temperature of the semi-steel, which saves energy. At the same time, the number of blowing and venting in the final semi-steel dry dust removal system is 0 times.

Embodiment 3

[0039] A steel factory smelts semi-steel on a 220t converter. Before smelting, the amount of ferrosilicon added to the semi-steel is determined according to the silicon and carbon content in the molten iron. Among them, the main element content of the molten iron and the temperature of the semi-steel are shown in Table 3:

[0040]

[0041] Because the carbon content in semi-steel water is 3.5%, the silicon content is relatively low, and silicon is trace amount after vanadium extraction treatment, so the silicon content in molten iron can be ignored in the later smelting; therefore, in the initial stage of semi-steel steelmaking, ferrosilicon is added 300kg. After carbon oxidation, the steelmaking temperature of the semi-steel is increased by 60 °C, and there is no need to increase the temperature of the semi-steel, which saves energy. At the same time, the number of blowing and venting in the final semi-steel dry dust removal system is 0 times.

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PUM

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Abstract

The invention belongs to the technical field of semi-steel steel-making, and particularly relates to a method for preventing blowing venting explosion of a dry dedusting system of a semi-steel steel-making converter. The method for preventing the blowing venting explosion of the dry dedusting system of the semi-steel steel-making converter is characterized in that according to the silicon and carbon contents in molten iron, when semi-steel comes out of a vanadium extraction converter, silicon iron is added to the semi-steel; particularly, when the carbon content in the molten iron is greater than 4.4wt%, no silicon iron is added; when the carbon content in the molten iron is 4.0-4.4wt%, 0.82-1kg silicon iron is added to per ton of steel; and when the carbon content in the molten iron is less than 4.0wt%, 1.27-1.45kg silicon iron is added to per ton of steel. The method is simple in technology; through adding silicon iron to the semi-steel, silicon and oxygen react first, so that the reaction time of carbon and oxygen is delayed; the temperature of the molten steel can be compensated through heat release of silicon oxidation, so that the production cost can be reduced; and the dry dedusting system can be matched, so that the times of blowing venting explosion can be reduced.

Description

technical field [0001] The invention belongs to the technical field of semi-steel steelmaking, and in particular relates to a method for preventing the dry dust removal system of a semi-steel steelmaking converter from blowing and venting. Background technique [0002] The characteristics of molten iron steelmaking containing vanadium and titanium are: the carbon content of the semi-steel obtained after vanadium extraction in the converter is lower than that of molten iron, and the silicon content is almost traces. specialty. Compared with molten iron smelting in semi-steel smelting, the dry dust removal system is more prone to gas explosion venting in the early stage. [0003] The semi-steel after vanadium extraction has low carbon, low silicon, and low manganese. For ordinary molten iron smelting, silicon-manganese oxidation reaction is carried out in the early stage of steelmaking converter smelting. According to the traditional dust removal process, it is easy to cause...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/38
CPCC21C5/28C21C5/38
Inventor 葛小波龚洪君喻林黄基红
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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