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A kind of rapid white slag production material and technology for 120tlf refining furnace

A refining furnace and white slag technology, which is applied in the field of steel smelting, can solve the problems of white slag instability, long slagging time, and slow slagging speed, so as to promote the stable maintenance of white slag, fast slagging speed, and deep deoxidation degree Effect

Active Publication Date: 2022-05-31
山东磐金锻造机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The white slag operation is the core operation of the LF refining furnace. The existing white slag production process of the LF refining furnace is: add lime and slagging agent to make slagging after entering the station, and at the same time add appropriate amount of ferrosilicon powder, silicon carbide or carbon powder for deoxidation. The speed of slag formation is slow, the time for slag formation is long, and the white slag is unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A 120tLF refining furnace rapid white slag production material, by weight percentage, including the following components: aluminum powder 8%, ferrosilicon powder 60%, carbon powder 25% and calcium fluoride 7%.

[0026] In this embodiment, the particle size of aluminum powder is 1 mm, the particle size of ferrosilicon powder is 1 mm, the particle size of carbon powder is 1 mm, and the particle size of calcium fluoride is 1 mm.

[0027] In this embodiment, the ferrosilicon powder is grade 72 ferrosilicon powder, the carbon powder is grade 90 carbon powder, and the calcium fluoride is grade 85 calcium fluoride.

[0028] A kind of 120tLF refining furnace is used for the technology of making white slag fast, comprises the following steps:

[0029] (1) The carbon content at the end of tapping of the 120t converter is ≥0.1%, adding 0.5kg / t of aluminum ingots for deoxidation, and the Al content of molten steel entering the station is 0.004-0.006%;

[0030] (2) Pour 1 / 2 of the ...

Embodiment 2

[0036] A 120tLF refining furnace rapid white slag making material, by weight percentage, includes the following components: 9% aluminum powder, 55% ferrosilicon powder, 30% carbon powder and 6% calcium fluoride.

[0037] In this embodiment, the particle size of aluminum powder is 2 mm, the particle size of ferrosilicon powder is 2 mm, the particle size of carbon powder is 2 mm, and the particle size of calcium fluoride is 2 mm.

[0038] In this embodiment, the ferrosilicon powder is grade 72 ferrosilicon powder, the carbon powder is grade 90 carbon powder, and the calcium fluoride is grade 85 calcium fluoride.

[0039] A kind of 120tLF refining furnace is used for the technology of making white slag fast, comprises the following steps:

[0040] (1) The carbon content at the end of tapping of the 120t converter is ≥0.1%, adding 0.6kg / t of aluminum ingots for deoxidation, and the Al content of molten steel entering the station is 0.004-0.006%;

[0041] (2) Pour 1 / 2 of the resid...

Embodiment 3

[0047] A 120tLF refining furnace rapid white slag production material, by weight percentage, including the following components: aluminum powder 10%, ferrosilicon powder 57%, carbon powder 28% and calcium fluoride 5%.

[0048] In this embodiment, the particle size of aluminum powder is 3 mm, the particle size of ferrosilicon powder is 3 mm, the particle size of carbon powder is 3 mm, and the particle size of calcium fluoride is 3 mm.

[0049] In this embodiment, the ferrosilicon powder is grade 72 ferrosilicon powder, the carbon powder is grade 90 carbon powder, and the calcium fluoride is grade 85 calcium fluoride.

[0050] A kind of 120tLF refining furnace is used for the technology of making white slag fast, comprises the following steps:

[0051] (1) The carbon content at the end of tapping of the 120t converter is ≥0.1%, adding 0.7kg / t of aluminum ingots for deoxidation, and the Al content of molten steel entering the station is 0.004-0.006%;

[0052] (2) Pour 1 / 2 of the...

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Abstract

The invention belongs to the technical field of steel smelting, and in particular relates to a rapid white slag making material and process for a 120tLF refining furnace, comprising the following components by weight percentage: 8-10% of aluminum powder, 50-60% of ferrosilicon powder, and carbon powder 25‑30% and calcium fluoride 5‑10%. The white slag making material and process provided by the present invention, calcium fluoride can lower the melting point of slag, adjust the fluidity of slag, the addition of aluminum powder can realize rapid deoxidation and white slag, the addition of carbon powder can promote the formation of long-arc foam slag, ferrosilicon powder can promote the stable maintenance of white slag; the degree of deoxidation of converter molten steel is deep, and the content of ferrous oxide in the slag entering the station is low; the reuse of the liquid reduction refining slag from the previous furnace can promote rapid slagging; the invention can promote rapid desulfurization and deoxidation of 120tLF furnace , Adsorption of inclusions, fast slag formation, stable white slag.

Description

technical field [0001] The invention belongs to the technical field of steel smelting, and in particular relates to a rapid white slag making material and process for a 120tLF refining furnace. Background technique [0002] Converter steelmaking generally adopts ladle refining technology, which transfers all or part of the deoxidation, desulfurization, gas reduction, inclusion reduction, steel composition and temperature adjustment to the ladle furnace in the steelmaking process, in order to obtain clean steel and high yield , high quality, low cost and good effect. In the ladle refining process, the selection of refining slag is very important. [0003] The white slag operation is the core operation of the LF refining furnace. The existing white slag production process of the LF refining furnace is: add lime and slagging agent to make slag after entering the station, and add appropriate amount of ferrosilicon powder, silicon carbide or carbon powder for deoxidation at the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/064
CPCC21C7/06C21C7/064Y02P10/20
Inventor 薛明亮傅士刚郭栋魏森黄彦飞魏文升杜建勇郭素萍李伟祥
Owner 山东磐金锻造机械有限公司
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