Refining low-slag-quantity operating process

An operation process and small slag volume technology, which is applied in the field of refining small slag volume operation process, can solve the problems of high production cost and so on

Inactive Publication Date: 2012-01-11
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current LF refining slag production often thinks that the larger the slag volume, the cleaner the removal of inclusions, and seldom considers the operation of small slag volume, resulting in high production costs

Method used

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  • Refining low-slag-quantity operating process

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Embodiment Construction

[0006] The refining small slag amount operation process of the present invention includes two parts, that is, the slagging agent is divided into two parts and added: a part of the slagging agent is added after the converter is tapped, and a part of the slagging agent is added when the molten steel enters refining; adding lime in the converter 100-200kg / furnace, add lime 500-600kg / furnace and alumina balls ≤150kg / furnace during refining.

[0007] This process is mainly divided into two parts; one part is completed after the converter puts steel, and the other part is completed when the molten steel enters refining.

[0008] 1. Converter process

[0009] During the tapping process, only lime is added to the ladle, specifically:

[0010] ① For ordinary steel, 100Kg of lime is added to the ladle during the tapping process of the converter;

[0011] ② For the variety steel, 200Kg of lime is added from the high-level silo during the tapping process of the converter.

[0012] 2...

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Abstract

The invention discloses a refining low-slag-quantity operating process. The refining low-slag-quantity operating process comprises the following two parts: adding one part of slag former after tapping of a converter, and adding the other part of the slag former when molten steel is refined; and adding lime into the converter, and then adding lime and alumina balls during refining. Oxygen content in the molten steel which is discharged from the converter is higher, the oxygen content in slag is also higher, deoxygenation task during refining is heavier, refining is carried out under a high-basicity and micro-reduction atmosphere, refining slag can be formed at the moment of tapping of the converter, firstly carbon powder is added, and thus carbon increment during refining is reduced; meanwhile, lime is also added, and basicity of the slag is improved, thus usage amount of lime during refining can be reduced, and the purpose of refining in advance is also achieved. By adopting the technical scheme, the refining low-slag-quantity operating process disclosed by the invention has the advantage that addition amounts of main slag formers (such as lime, alumina balls and the like) are reduced while purity of the molten steel and product percent of pass are guaranteed, thus production cost is reduced.

Description

technical field [0001] The invention relates to a small slag amount refining process, which reduces the added amount of main slagging agents (lime, alumina balls, etc.) under the condition of ensuring the purity of molten steel and product qualification rate, thereby reducing production costs. Background technique [0002] At present, the purpose of LF refining furnace slagging is mainly to fully absorb inclusions in molten steel and purify molten steel. However, the current LF refining slag production often thinks that the larger the slag volume, the cleaner the removal of inclusions, and seldom considers the operation of small slag volume, resulting in high production costs. Contents of the invention [0003] For this reason, the object of the present invention is to provide a refining small slag operation process, in the case of ensuring the purity of molten steel and product pass rate, reduce the addition of main slagging agents (lime, alumina balls, etc.), thereby red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 朱书成张兵许少普张立新崔冠军杨东张少辉刘丹王新赵迪乔华伟袁恒许春
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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