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Low-cost composite pre-deoxidation method for molten steel

A pre-deoxidation, low-cost technology, applied in the manufacture of converters and other directions, can solve the problems of foaming and slag overflow, and achieve the effects of reducing the cost of deoxidation, inhibiting secondary oxidation, and improving the quality of molten steel

Inactive Publication Date: 2022-02-11
SD STEEL RIZHAO CO LTD
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  • Description
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Problems solved by technology

[0005] ①Calcium carbide is added after the converter is tapped. At this time, the oxygen potential of molten steel and slag is high, and it is easy to cause severe foaming and slag overflow;

Method used

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Embodiment Construction

[0016] The present invention will now be described in further detail.

[0017] A low-cost composite pre-deoxidation method for molten steel, comprising the following steps: 1) when 1 / 3 of the steel is tapped from the converter, coke powder is added to make the coke powder fully react with the oxygen in the molten steel during the tapping process, and after the coke powder is added, 1 -2min, add deoxidation alloy for deoxidation alloying, the amount of coke powder added is adjusted according to the oxygen at the end of the converter, and the amount added is according to the formula (where O z is the oxygen content at the end point of the converter, and the unit is ) to add;

[0018] 2) When the molten steel reaches the LF refining furnace, before reaching the processing position, add 20-30kg of coke powder to the slag surface, and turn on the bottom blowing argon gas for stirring, and pre-deoxidize the oxygen in the slag;

[0019] 3) After the molten steel reaches the treatm...

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Abstract

The invention discloses a low-cost composite pre-deoxidation method for molten steel, which comprises the following steps that: when 1 / 3 of molten steel is tapped from a converter, coke powder is added, so that the coke powder reacts with oxygen in the molten steel in the tapping process, and a deoxidation alloy is added 1-2 minutes after the coke powder is added; before the molten steel reaches a treatment position of an LF refining furnace, 20-30 kg of coke powder is added to the slag surface, argon bottom blowing is started, stirring is conducted, and oxygen in the slag is de-oxidized; when the molten steel reaches the treatment position of the LF refining furnace, 20-40 kg of calcium carbide is added to the slag surface, and slag deoxidation is conducted through stirring; and 20-40kg of calcium carbide is added again to deoxidize the oxygen in the furnace slag again if the furnace slag is blackened in the slagging process of the LF refining furnace. Part of materials used in the method are coking tailings and can partially replace deoxidation alloy; and meanwhile, the deoxidation product is carbon monoxide or carbon dioxide, so that the cleanliness of the molten steel can be effectively promoted, and good conditions are provided for improving the product quality.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a low-cost composite pre-deoxidation method for molten steel. Background technique [0002] For aluminum-killed steel, which accounts for a relatively large proportion, aluminum-based alloys are usually used for deoxidation and alloying during the tapping process of the converter. After deoxidation and alloying of molten steel, after refining LF, aluminum particles or aluminum deoxidizers are used in the process of slagging. Carry out slag deoxidation. No matter what kind of alloy is used for deoxidation, the oxide inclusions generated will cause great pollution to molten steel. [0003] The existing Chinese Patent No. CN201911144136.9 discloses a refining agent and refining process for scrap iron and steelmaking, which states that "sprinkle a layer of calcium carbide on the surface of molten steel slag after sampling", but the timing and amount of adding Not sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C5/28
CPCC21C7/06C21C5/28
Inventor 刘建伟王学新佟圣刚王兴薛燕赵珉孙金明梁亚陈传磊吴计雨李世良季伟烨
Owner SD STEEL RIZHAO CO LTD
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