A method for reducing carbon and oxygen deposition at the end point of converter smelting

A converter smelting and terminal carbon technology, which is applied in the manufacture of converters, etc., can solve the problems of increasing the difficulty of steel purification, increasing the amount of deoxidized alloy, and increasing production costs.

Active Publication Date: 2020-06-16
德龙钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct consequence of this overoxidation on the one hand increases the amount of deoxidized alloy, that is, increases the production cost, and on the other hand greatly increases the difficulty of controlling the purification of steel

Method used

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  • A method for reducing carbon and oxygen deposition at the end point of converter smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Example 1: 100T converter steelmaking, the C content of the molten iron entering the furnace is 4.5%, the temperature of the molten iron entering the furnace is 1400 ° C, the molten iron is mixed into the converter for smelting, the full oxygen supply time is 14 minutes, and the oxygen supply is added from the high-level silo when the oxygen supply is 10 minutes 110kg magnesia carbon brick and 22kg fluorite, bottom blowing argon gas flow rate is 100m 3 / h, the end temperature of the converter is 1630°C, the carbon content of molten steel is 0.05%, the oxygen content is 0.036%, and the carbon-oxygen product is 0.18*10 -6 .

Embodiment 2

[0029] Example 2: 100T converter steelmaking, the C content of the molten iron entering the furnace is 4.5%, the temperature of the molten iron entering the furnace is 1400°C, the molten iron is mixed into the converter for smelting, the full oxygen supply time is 15 minutes, and the oxygen is supplied from the high-level silo for 10.5 minutes. Add 120kg of magnesia carbon bricks and 24kg of fluorite, and the bottom blowing argon gas flow rate is 80m 3 / h, the end temperature of the converter is 1630°C, the carbon content of molten steel is 0.055%, the oxygen content is 0.04%, and the carbon-oxygen product is 0.22*10 -6 .

Embodiment 3

[0030] Example 3: 100T converter steelmaking, the C content of the molten iron entering the furnace is 4.5%, the temperature of the molten iron entering the furnace is 1400°C, the molten iron is mixed into the converter for smelting, the full oxygen supply time is 14 minutes, and the oxygen is supplied from the high-level silo for 10.5 minutes. Add 115kg of magnesia carbon bricks and 23kg of fluorite, and the bottom blowing argon gas flow rate is 90m 3 / h, the end temperature of the converter is 1630°C, the carbon content of molten steel is 0.05%, the oxygen content is 0.04%, and the carbon-oxygen product is 0.2*10 -6 .

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Abstract

A method for reducing carbon and oxygen deposition at the end of converter smelting. When the temperature of molten steel in the middle and late stages of converter smelting is ≥1500°C, add crushed magnesia-carbon bricks and catalysts into the furnace. The discarded magnesia-carbon bricks are replaced with new bricks after offline, and the catalyst is derived from fluorite. By adopting the method of the present invention, the carbon and oxygen product at the converter smelting end point is from 0.27*10 ‑6 ~0.32*10 ‑6 Reduced to 0.18*10 ‑6 ~0.22*10 ‑6 , [O] in steel decreased from 0.07 to 0.08% to 0.03 to 0.05%. For aluminum-killed steel, because the [O] content in the steel is reduced by 0.03% on average, the aluminum alloy can be saved by 1.15kg / t. The aluminum alloy price is calculated as 12,000 yuan / t, and the production cost is reduced by 13.8 yuan / t. In addition, the MgO produced by the combination of MgO that has not been completely reduced and Mg and O enters the slag for slag splashing to protect the furnace and maintain the furnace condition.

Description

technical field [0001] The invention relates to a method for iron and steel smelting, in particular to a method for reducing carbon and oxygen accumulation at the end point of converter smelting. Background technique [0002] Under the working conditions of the converter, there is a certain fixed product of C and O dissolved in the molten steel, the premise is that under the condition that the partial pressure of the carbon content and the temperature are fixed, the C-O reaction relationship can be used, that is, m=ω[ C]×ω[O], in equilibrium state (certain temperature T and equilibrium partial pressure P CO ) is a constant. According to the principle of reaction balance, with the reduction of carbon in steel, the oxygen mass fraction will inevitably increase. Therefore, the level of carbon and oxygen accumulation at the end of molten steel is an important basis for measuring oxygen in steel. In the process of tapping, how to reduce the oxygen mass fraction in the molten st...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C21C5/28C21C7/06
CPCC21C5/28C21C7/06
Inventor黄伟丽杨志刚陈四平朱红芳
Owner德龙钢铁有限公司