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Process for smelting vanadium-containing molten iron converter

A technology for converter smelting and molten iron, applied in the direction of manufacturing converters, etc., can solve problems such as inconspicuous effects, and achieve the effect of improving the furnace age of the converter and the furnace age of the converter.

Inactive Publication Date: 2010-04-07
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0007] However, the use of existing methods to increase the age of the converter has no obvious effect on increasing the age of the vanadium-containing molten iron smelting converter. , the consumption of supplementary materials during the furnace operation is 345-430 tons

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] In practice, when the 80t converter is smelted with vanadium-containing molten iron, when the molten iron is mixed in and the oxygen lance blowing is started, 20-30kg of active lime and 4-7kg of steelmaking sludge balls are added per ton of molten steel, and according to the Si content, according to the formed slag (CaO / SiO 2 ) 2.2~2.8 Add composite slagging agent, and control the position of oxygen blowing lance at 1.2~1.6m. In oxygen blowing volume 20~30Nm 3 (calculated per ton of tapping molten steel), when the temperature is 1400-1460°C, stop blowing, and remove the formed slag from the converter to the slag pot as much as possible. The main component of the formed slag is CaO / SiO 2 2.2~2.8, V 2 o 5 4.5-7.5%, TFe12-16%, P1.0-1.4%, the V content of the vanadium-containing molten iron is 0.15%-0.20% before blowing, and the V content of the molten iron is reduced to 0.01%-0.03% after blowing. In practical applications, 50-70% of the slag can be drained, so that V ...

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Abstract

The invention belongs to the technical field of ferrous metallurgy, in particular relates to a process for smelting a vanadium-containing molten iron converter, and solves the technical problem of improving the service life of the vanadium-containing molten iron converter. The process comprises two times of slag making, namely in the first time of slag making, reducing the vanadium content of blown molten iron to below 0.03 percent and discharging formed primary slag, and adding slag making materials in the converter for the second time for smelting. Slag with high vanadium content and phosphor content formed in the first time of slag making is removed possibly, and converter slag which has high melting point and low oxidability and is suitable for slag splashing is formed in the second times of slag making, so that the service life of the vanadium-containing molten iron converter is obviously improved. The method not only can effectively ensure smooth operation of the converter steel making process, but also can produce converter slags more suitable for slag splashing to greatly improve the service life of the converter.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular to a process for smelting vanadium-containing molten iron in a converter. Background technique [0002] At present, the main means of increasing the life of the converter is to optimize the furnace type, improve the quality of refractory bricks, strengthen the maintenance of the converter lining, and splash slag to protect the furnace. [0003] By optimizing the furnace type of the converter, the mechanical erosion damage of the furnace lining can be reduced, and the loss can be reduced. [0004] Improve the quality of refractory bricks so that the refractoriness of refractory bricks reaches above 1780°C, the high-temperature flexural strength (1400°C×0.5h)≥8MPa, the load softening start temperature is 1600°C, and the bulk density is ≥2.95g / cm 3 To achieve the purpose of increasing furnace life. [0005] Strengthening the maintenance of the converter lining is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/36
Inventor 王建易邦伦何为周永健戈文荪罗促黄正全余海滨严加琪
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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