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Method for smelting clean steel in electromagnetic induction furnace by blowing CO2

A technology of electromagnetic induction furnace and smelting method, which is applied in the direction of electric furnace, furnace, furnace type, etc., to achieve the effect of reducing the amount of alloy, reducing the phenomenon, and slowing down the greenhouse effect

Active Publication Date: 2011-08-10
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above methods all focus on how to reduce oxygen consumption, reduce the amount of soot and CO 2 In the study of recycling, CO 2 replace N 2 Except for the operation with gas, mixed gas is used in the rest of the smelting process, and the proportion of mixed gas needs to be adjusted continuously as the smelting progresses, which puts forward higher requirements for operation control and basic equipment. In addition, these patent applications are all There is no use of CO blowing for the production of clean steel 2 Elaboration on decarbonization

Method used

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  • Method for smelting clean steel in electromagnetic induction furnace by blowing CO2
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  • Method for smelting clean steel in electromagnetic induction furnace by blowing CO2

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: An electromagnetic induction furnace injects CO 2 The clean steel smelting method of decarburization is carried out on a 500kg multifunctional electromagnetic induction furnace. The ratio of raw materials is 248kg of scrap steel, 50kg of pig iron, 298kg of molten steel, and 20kg of slag, which are added before blowing. The initial conditions of raw materials are shown in Table 1 and Table 2.

[0042] Table 1 Metal Material Composition / %

[0043]

[0044] Table 2 Slag Composition / %

[0045]

[0046] Melt the prepared charge to above 1600°C, using three kinds of CO 2 Experiment with the gas flow scheme, change the blowing gas flow every 5 minutes, and take temperature measurement and sampling, the bottom blowing Ar flow is 0.1-0.3Nm in the whole process 3 / (min·t), when the temperature is lower than 1500°C in the embodiment 2, measures to raise the temperature are taken, and the specific scheme is shown in Table 3.

[0047] Table 3 Smelting scheme...

Embodiment 2

[0052] Embodiment 2: carry out on the 500kg multifunctional electromagnetic induction furnace. The ratio of raw materials is 220kg of scrap steel, 70kg of pig iron, 290kg of molten steel, and 20kg of slag, which are added before blowing. The initial conditions of the raw materials are the same as in Example 1.

[0053] Melt the prepared charge to above 1600°C, and the flow of Ar at the bottom of the whole process is 0.1-0.3Nm 3 / (min·t), when the temperature is lower than 1500°C, temperature rise measures are taken, and temperature measurement and sampling are carried out. When the measured carbon content is 0.35%, the blowing gun is stopped. The details and results are shown in Table 5. It can be seen that when the decarburization amount is 0.20%, the oxygen activity in molten steel does not increase.

[0054] Table 5 patent embodiment result

[0055]

Embodiment 3

[0056] Embodiment 3: carry out on the 500kg multifunctional electromagnetic induction furnace. The ratio of raw materials is 236kg of scrap steel, 50kg of pig iron, 286kg of molten steel, and 20kg of slag, which are added before blowing. The initial conditions of the raw materials are the same as in Example 1.

[0057] Melt the prepared charge to above 1600°C, and the flow of Ar at the bottom of the whole process is 0.1-0.3Nm 3 / (min·t), when the temperature is lower than 1500°C, temperature rise measures are taken, and temperature measurement and sampling are carried out. When the measured carbon content is 0.17%, the blowing gun is stopped.

[0058] The details and results are shown in Table 6. Injecting CO 2 While decarburization is achieved, the oxygen activity in molten steel basically does not increase.

[0059] Table 6 patent embodiment result

[0060]

[0061] The above-mentioned embodiment adopts blowing O 2 When decarbonizing, under the same conditions, the ...

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Abstract

The invention discloses a method for smelting clean steel in an electromagnetic induction furnace by blowing CO2. In the method, when the electromagnetic induction furnace is used for smelting clean steel and when the carbon content in molten steel is less than 0.1 percent, CO2 is blown for decarburization and the decarburization amount is controlled by a furnace gas analysis system. The method has the advantages that the decarburization by blowing CO2 relieves the peroxidation of molten steel, improves quality of the molten steel, and reduces the consumption of deoxidated alloy. The method can create significant social benefit for reduction in CO2 emission and alleviation of greenhouse effect and has a great practical significance for reducing oxygen content in steel, educing consumptionof alloy and improve quality of molten steel.

Description

technical field [0001] The invention relates to a smelting process of clean steel, and relates to the control of the carbon content, oxygen content and temperature of molten steel during the smelting process of an electromagnetic induction furnace. 2 A method of producing clean steel. Background technique [0002] In the process of clean steel production, in order to achieve the goal of low-carbon tapping, it is often at the expense of molten steel peroxidation. This will not only lead to an increase in the amount of deoxidized alloy, but also make it difficult to remove deoxidized inclusions, which indirectly leads to a decline in steel quality. [0003] The literature materials that have been checked have not controlled the oxygen content in the steel when the electromagnetic induction furnace is used to smelt clean steel. In order to achieve low-carbon steel tapping, it is often necessary to blow more O 2 , so it often leads to overoxidation of molten steel, resulting i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/068
Inventor 唐复平万雪峰李德刚赵成林赵刚曹东
Owner ANGANG STEEL CO LTD
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