A method for high temperature dephosphorization of a converter

A converter and dephosphorization technology, which is applied in the manufacture of converters and other directions, can solve the problems of increased difficulty in dephosphorization, deterioration of dephosphorization thermodynamic conditions, etc., and achieves reduction of steelmaking production cost, high dephosphorization efficiency, and good dephosphorization effect. Effect

Active Publication Date: 2019-03-26
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

However, these links are different from the situation in the steelmaking furnace. The corresponding dephosphorization thermodynamic conditions have deteriorated, and the object of dephosphorization treatment has changed, which greatly increases the difficulty of dephosphorization.

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  • A method for high temperature dephosphorization of a converter

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Embodiment 250

[0036] The method for high-temperature dephosphorization of a 250-ton converter in this embodiment comprises the following steps:

[0037] In the first step, 258 tons of molten iron and 32 tons of scrap steel are added to the furnace body of the converter. The molten iron includes the following components according to the mass percentage: C4.22%, Si 0.29%, Mn 0.291%, P 0.121%, S 0.03%, and the rest is Fe and impurities, the temperature of molten iron is 1332 ℃; steel scrap includes the following components according to mass percentage: C 0.05%, Si0.1%, Mn 0.30%, P0.025%, S 0.020%, the rest is Fe and impurities.

[0038] The second step, according to the binary basicity R = 4.5, the final slag magnesium oxide content is 9% to calculate the addition of lime and light-burned dolomite (light-burned magnesia balls), light-burned dolomite (light-burned magnesia balls) is the guarantee The main slag forming material of magnesium oxide content in slag. The main components of lime, li...

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Abstract

The invention relates to a method for high-temperature dephosphorization in a converter. The method comprises the following steps that firstly, scrap steel and molten iron are poured into the converter; secondly, a cold pressing ball containing ferric oxide is added into the converter, then oxygen blowing smelting is conducted, the strength of top-blowing oxygen is 3.0-3.4 m<3> / t.min, and meanwhile molten steel is stirred through bottom blowing gas; thirdly, when the components and the temperature of the molten steel meet the requirements, oxygen blowing smelting is stopped, the flow of the bottom blowing gas is controlled between 0.08-0.1 m<3> / t.min after oxygen blowing, and bottom blowing stirring is conducted for 3-7 min, and steel tapping is prepared; fourthly, the molten steel is injected into a ladle from a steel tapping outlet of the converter for steel tapping, a ladle slag modifying agent and active lime are added into the molten steel in the steel tapping process, and deep dephosphorization is conducted; and fifthly, after steel tapping, a ladle slag accelerant is added to the surface of the molten steel. The method for high-temperature dephosphorization in the converter has the beneficial effects that the dephosphorization effect is good, the dephosphorization efficiency is high, the steel-making production cost is reduced, and the method is suitable for being applied and popularized on a large scale.

Description

technical field [0001] The invention relates to a high-temperature dephosphorization method for a converter, belonging to the technical field of low-phosphorus steel smelting. Background technique [0002] According to the applicant's understanding, the dephosphorization problem in steelmaking production has been widely concerned in the metallurgical field. In the past, the research on dephosphorization was mainly devoted to the production of steel products with qualified phosphorus content, focusing on dephosphorization in the smelting furnace. At present, the steelmaking furnace Good dephosphorization thermodynamic conditions of high alkalinity, high oxidizing slag, and lower temperature have been created in China. However, due to the rephosphorization of molten steel in the ladle and the deoxidation of molten steel, the phosphorus introduced by the ferroalloy during the alloying process makes the phosphorus content in the final steel product only close to the qualified st...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C21C5/35C21C7/064
CPCC21C5/35C21C7/0645
Inventor胡建光唐洪乐
OwnerSHANGHAI MEISHAN IRON & STEEL CO LTD