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Deformed steel bar converter slag washing desulfurization method

A converter slag and rebar technology, applied in the direction of manufacturing converters, etc., can solve the problem of excessive sulfur content in molten steel, and achieve the effects of reducing usage, increasing O2-ion concentration, and easy implementation.

Pending Publication Date: 2021-11-19
CHONGQING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the purpose of the present invention is to solve the problem of excessive sulfur content in molten steel during converter smelting, to provide a method for desulfurizing rebar steel converter slag, and to perform desulfurization remedial treatment on molten steel

Method used

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Examples

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Effect test

Embodiment 1

[0018] A method for washing and desulfurizing rebar steel converter slag. When rebar steel is smelted in a converter, when it is detected that the sulfur content of the molten steel is 0.040%, the following implementation steps are adopted for desulfurization treatment: adding top slag to the ladle for modification during the converter tapping process The top slag modifying agent is metallurgical lime and silicon-calcium-barium-aluminum, and the amount of metallurgical lime added per ton of steel is 5kg, and the amount of silicon-calcium-barium-aluminum added per ton of steel is 2kg, and silicon-calcium-barium-aluminum is added first After adding aluminum, silicon calcium barium aluminum, metallurgical lime is added to control the basicity of ladle top slag to 2.5. By deoxidizing the molten steel first, reducing the oxygen activity in the molten steel, and then increasing the O in the top slag of the ladle 2- Desulfurize the molten steel; and use the kinetic energy of the molt...

Embodiment 2

[0021] A method for washing and desulfurizing rebar with converter slag. When rebar is smelted in a converter and the sulfur content of molten steel is found to be 0.050%, the following steps are adopted for desulfurization: add a top slag modifier to the ladle during the converter tapping process Control the composition of ladle top slag, wherein the top slag modifier is metallurgical lime and silicon-calcium-barium-aluminum, control the addition of metallurgical lime to 6kg per ton of steel, and the addition of silicon-calcium-barium-aluminum to 2kg per ton of steel, first add silicon-calcium-barium-aluminum After adding silicon, calcium, barium and aluminum, metallurgical lime is added to control the basicity of ladle top slag to 2.6. By deoxidizing the molten steel first, reducing the oxygen activity in the molten steel, and then increasing the O in the top slag of the ladle 2- Desulfurize the molten steel; and use the kinetic energy of the molten steel during the tapping ...

Embodiment 3

[0024] A method for washing and desulfurizing screw steel converter slag. When the screw steel is smelted in the converter, when the sulfur content of molten steel is found to be 0.055%, the following steps are adopted for desulfurization treatment: adding a top slag modifier to the ladle during the converter tapping process Control the composition of ladle top slag, wherein the top slag modifier is metallurgical lime and silicon-calcium-barium-aluminum, control the addition of metallurgical lime to 8kg per ton of steel, and the addition of silicon-calcium-barium-aluminum to 2kg per ton of steel, first add silicon-calcium-barium-aluminum After adding silicon, calcium, barium and aluminum, metallurgical lime is added to control the basicity of ladle top slag to 2.8. By deoxidizing the molten steel first, reducing the oxygen activity in the molten steel, and then increasing the O in the top slag of the ladle 2- Desulfurize the molten steel; and use the kinetic energy of the molt...

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Abstract

The invention belongs to the technical field of steel and iron smelting, and relates to a deformed steel bar converter slag washing desulfurization method. The deformed steel bar converter slag washing desulfurization method comprises the following steps: adding a top slag modifier into a steel ladle in a converter tapping process to control the components of steel ladle top slag, deoxidizing molten steel at first to reduce the oxygen activity in the molten steel, and then increasing the O<2-> ion concentration in the steel ladle top slag to desulfurize the molten steel; and stirring the steel ladle top slag and the molten steel by means of kinetic energy of the molten steel in the tapping process, and meanwhile, blowing argon or nitrogen into the steel ladle for stirring to accelerate a reaction between the steel and the slag. The deformed steel bar converter slag washing desulfurization method is optimized on the basis of an original technology, no equipment or facilities are added, original conditions are fully utilized, and implementation is easy; and meanwhile, a desulfurization material utilization rate is high, and the usage amount is reduced, so that the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a method for washing and desulfurizing screw steel converter slag. Background technique [0002] In converter smelting, there are occasions when molten steel is directly smelted without KR desulfurization or after desulfurization is still found to have a high sulfur content, so that the sulfur content of molten steel does not meet the requirements for steel type judgment, resulting in the scrapping of molten steel in this furnace or Reheat processing. Contents of the invention [0003] In view of this, the purpose of the present invention is to solve the problem of excessive sulfur content in molten steel during converter smelting, and provide a method for desulfurizing rebar steel converter slag to perform desulfurization remedial treatment on molten steel. [0004] To achieve the above object, the present invention provides the following technical solutions: ...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C7/064
CPCC21C5/30C21C7/064
Inventor 陈鸿员胡昌志文敏程殿代伟刘晓峰
Owner CHONGQING IRON & STEEL CO LTD
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