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Passivation deoxidizer for LF furnace refining and blowing and deoxidizing method thereof

A technology of deoxidizer and calcium carbide powder, applied in the field of metallurgy

Inactive Publication Date: 2007-02-07
INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the traditional deoxidation process for LF furnace refining at present, the present invention provides a passivation deoxidizer and deoxidation method for LF furnace refining injection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The calcium carbide block or lime block enters the jaw crusher through the belt conveyor for primary crushing, and then is sent to the Raymond mill for grinding through the bucket elevator; the particle size of the powder is shown in Table 1. The composition and quality requirements of calcium carbide blocks and lime blocks used are shown in Table 2 and Table 3, respectively.

[0024] Adding hydroxyl-terminated methyl vinyl silicone oil accounting for 8% by weight of calcium carbide powder or lime powder to calcium carbide powder and lime powder respectively and mixing uniformly for passivation to make passivated calcium carbide powder or passivated lime powder products. The composition of the passivation deoxidizer is calculated by weight percentage: 60% of passivation calcium carbide powder and 40% of passivation lime powder.

[0025] Spray passivated calcium carbide powder into molten steel at a ratio of 0.2Kg / ton of steel, with a ladle capacity of 100 tons, for deox...

Embodiment 2

[0027] The calcium carbide blocks enter the jaw crusher through the belt conveyor for primary crushing, and then are sent to the Raymond mill for grinding through the bucket elevator; the powder particle size is shown in Table 1. The calcium carbide blocks used and their quality requirements are shown in Table 2.

[0028] Adding hydroxyl-terminated methylvinyl silicone oil accounting for 1% of the calcium carbide powder by weight to the calcium carbide powder and mixing uniformly for passivation to produce a passivated calcium carbide powder product. The composition of the passivating deoxidizer is calculated by weight percentage: 100% of passivating calcium carbide powder.

[0029] Spray deoxidizer into the molten steel at a ratio of 1.5Kg / ton of steel for deoxidation and desulfurization of bearing steel. The mixing ratio of passivated calcium carbide powder and passivated lime powder is 1:1. After treatment, samples were taken and analyzed in the molten steel in the tundish...

Embodiment 3

[0031] The calcium carbide block or lime block enters the jaw crusher through the belt conveyor for primary crushing, and then is sent to the Raymond mill for grinding through the bucket elevator; the particle size of the powder is shown in Table 1. The composition and quality requirements of calcium carbide blocks and lime blocks used are shown in Table 2 and Table 3, respectively.

[0032] Adding hydroxyl-terminated methyl vinyl silicone oil accounting for 15% by weight of calcium carbide powder or lime powder to calcium carbide powder and lime powder respectively and mixing uniformly for passivation to make passivated calcium carbide powder or passivated lime powder products. The composition of the passivation deoxidizer is calculated by weight percentage: 20% of passivation calcium carbide powder and 80% of passivation lime powder.

[0033] Spray the mixed powder of passivated calcium carbide powder and passivated lime powder into molten steel at a ratio of 0.8Kg / ton of st...

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PUM

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Abstract

the invention discloses a passive deoxidant of LF furnace refining spraying, which consists of 100-20% passive carbide powder and 0-80% passive lime powder, wherein the passive carbide powder or passive lime powder is blended by 1-15% carbide powder or lime powder and hydroxyl capping methyl-vinyl silicon oil according to proportion.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a passivation deoxidizer and a deoxidation method for LF furnace refining injection. Background technique [0002] With the increasing requirements of users for steel quality, iron and steel enterprises are paying more and more attention to improving the cleanliness of molten steel. In recent years, many iron and steel enterprises in my country are undergoing or preparing to carry out large-scale technical transformation of the production process, the core of which is the use of molten iron pretreatment, refining outside the furnace and continuous casting technology. Among them, LF refining technology has been fully developed. The purpose of LF refining is to remove harmful elements (S, P, H, O, N) and their inclusions in steel. [0003] The traditional deoxidation process of LF refining outside the furnace is to add calcium carbide blocks to the slag surface for diffusion de...

Claims

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Application Information

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IPC IPC(8): C21C7/06
Inventor 孙中强李裕华孙立国
Owner INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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