Refining low-slag-quantity operating process

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...

AI Technical Summary

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

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