Rapid decarbonization method for performing segmented bottom blowing by adopting multiple gases

A gas and fast technology, applied in the field of iron and steel metallurgy, can solve the problems of reducing production cost, disadvantage, increasing metal Al/Si consumption, etc., to achieve the effect of strong disturbance, longer contact time, and longer action path

Active Publication Date: 2020-01-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method increases the consumption of metal Al / Si, which is not conducive to reducing production costs

Method used

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  • Rapid decarbonization method for performing segmented bottom blowing by adopting multiple gases
  • Rapid decarbonization method for performing segmented bottom blowing by adopting multiple gases
  • Rapid decarbonization method for performing segmented bottom blowing by adopting multiple gases

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The molten steel to be treated meets the following requirements: carbon content 0.07wt%-0.09wt%, oxygen content 0.04wt%-0.050wt%, temperature 1650-1700°C.

[0047] When the ladle is placed in the RH processing station, insert the downcomer and the ascender into the molten steel in the ladle, and start the vacuum pump to pump air. When the pressure in the vacuum degassing tank is less than 17kPa, supply CO through the argon blowing tube 2 -Ar mixed gas is used as cycle gas and reaction medium, CO in the mixed gas 2 The content is 50%, the gas supply strength is 0.7Nm 3 / h·t, using CO at high temperature 2 Weak oxidation of gas, reaction: C+CO 2 = 2CO. On the one hand, direct decarbonization, CO 2-Ar mixed gas reduces the partial pressure of CO to promote the reaction. On the other hand, twice as much CO is generated, and the circulation flow rate is increased to accelerate decarbonization. At the same time, the oxygen lance injects O 2 Gas, the gas supply strengt...

Embodiment 2

[0049] The molten steel to be treated meets the following requirements: carbon content 0.07wt%-0.09wt%, oxygen content 0.04wt%-0.050wt%, temperature 1650-1700°C.

[0050] When the ladle is placed in the RH processing station, insert the downcomer and the ascender into the molten steel in the ladle, and start the vacuum pump to pump air. When the pressure in the vacuum degassing tank is less than 17kPa, supply CO through the argon blowing tube 2 -Ar mixed gas is used as cycle gas and reaction medium, CO in the mixed gas 2 Content 65wt%, air supply strength 1.2Nm 3 / h·t; using CO at high temperature 2 Weak oxidation of gas, reaction: C+CO 2 = 2CO. On the one hand, direct decarbonization, CO 2 -Ar mixed gas reduces the partial pressure of CO to promote the reaction. On the other hand, twice as much CO is generated, and the circulation flow rate is increased to accelerate decarbonization. At the same time, the oxygen lance injects O 2 Gas, the gas supply strength is 12Nm ...

Embodiment 3

[0052] The molten steel to be treated meets the following requirements: carbon content 0.07wt%-0.09wt%, oxygen content 0.04wt%-0.050wt%, temperature 1650-1700°C.

[0053] When the ladle is placed in the RH processing station, insert the downcomer and the ascender into the molten steel in the ladle, and start the vacuum pump to pump air. When the pressure in the vacuum degassing tank is less than 17kPa, supply CO through the argon blowing tube 2 -Ar mixed gas is used as cycle gas and reaction medium, CO in the mixed gas 2 Content 55wt%, air supply strength 1.0Nm 3 / h·t; using CO at high temperature 2 Weak oxidation of gas, reaction: C+CO 2 = 2CO. On the one hand, direct decarbonization, CO 2 -Ar mixed gas reduces the partial pressure of CO to promote the reaction. On the other hand, twice as much CO is generated, and the circulation flow rate is increased to accelerate decarbonization. At the same time, the oxygen lance injects O 2 Gas, the gas supply strength is 10Nm ...

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Abstract

The invention discloses a rapid decarbonization method for performing segmented bottom blowing by adopting multiple gases. The rapid decarbonization method comprises the following steps that (a1), when the pressure inside a vacuum degassing tank is less than 17 kPa, an argon blowing tube supplies a first gas; (a2), while the argon blowing tube supplies the first gas, an oxygen gun sprays and blowsO2 gas, and a bottom blowing tube sprays and blows CO2 gas; and (a3), when the pressure inside the vacuum degassing tank is less than 300 Pa, the argon blowing tube stops supplying the first gas andbegins supplying a second gas, and meanwhile, the bottom blowing tube stops spraying and blowing the CO2 gas and begins spraying and blowing Ar gas. By means of the rapid decarbonization method for performing the segmented bottom blowing by adopting the multiple gases, low-cost, rapid and good-effect decarbonization can be realized.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, and more specifically, relates to an RH vacuum treatment device and a method for using the device for rapid decarburization. Background technique [0002] In recent years, the function of RH vacuum degassing equipment and RH and the range of refined steel types have been continuously expanded, and it has developed into a multi-functional vacuum refining technology, which plays a leading role in out-of-furnace refining. Most steel mills are equipped with RH refining equipment to realize high-efficiency and low-cost production of high-quality steel. [0003] As the market has lower and lower requirements for carbon content in steel, especially the carbon content of finished products is within 15ppm or even 10ppm. In order to meet this requirement, RH uses oxygen blowing to force decarburization, and it is necessary to extend the oxygen supply time to cause the oxygen activity of molten stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/068
CPCC21C7/068C21C7/10
Inventor 李龙王建
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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