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Electric furnace steel-making method utilizing like graphite to replace pig iron to match with carbon

An electric furnace steelmaking and graphite technology, which is applied in the field of steelmaking, can solve the problems of uncontrollable reaction speed of coke particles and carbon furnace and high cost of steelmaking

Inactive Publication Date: 2010-06-02
ANYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The cost of using pig iron or molten iron to mix carbon in electric furnaces is high, and the reaction speed in the furnace with coke particles and carbon is not easy to control. Therefore, in the field of electric furnace steelmaking, it is urgent to find a carbon-containing substance that can replace pig iron or molten iron with carbon and is suitable for large-scale electric furnace smelting. And developed a suitable electric furnace smelting process, in order to reduce the cost of the electric furnace, but also to find a new way out for the survival of the electric furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: Angang 100-ton electric furnace uses the method of the present invention to smelt bridge steel Q345q with all scrap steel

[0030] Two baskets of materials are loaded, with a total loading capacity of 130 tons. The first basket weighs 70 tons, of which 20 tons of pig iron are added, and a bag of 1.25 tons of graphite is added to the bottom of the first basket. The arc is started at 7 levels of voltage, and the arc is stable. Finally, the 9~11 gear voltage level is used for power transmission. After power transmission of 4MWh, the oxygen oil burner and the furnace wall oxygen lance are turned on. Add the second basket of material after the batch material is emptied, and start arcing at the 7th gear voltage. After the arcing is stable, the 9th to 11th gear voltage level is used for power transmission. After the power supply, the furnace door gun assists the furnace wall oxygen gun to blow oxygen. The total amount of oxygen blowing is controlled within 1500m3...

Embodiment 2

[0031] Embodiment 2: Anyang Iron and Steel 100-ton electric furnace uses the method of the present invention to smelt high-strength ship plate steel AH32

[0032] Two baskets of material are loaded, with a total load of 129 tons. The first basket weighs 69.5 tons, and 15 tons of pig iron are added. Before loading, 800kg of graphite and 800kg of lime are added to the furnace through the high-level silo, and the arc is started at 7 levels of voltage. After the arc start is stable, the voltage level of 9~11 will be used for power transmission. After power transmission of 4MWh, the oxygen oil burner and the furnace wall oxygen lance will be turned on. After the slag is flowing, the furnace door gun will be used to blow oxygen. Add the second basket of materials, still start the arc at the 7th level voltage, after the arcing is stable, the 9th to 11th level voltage level is used for power transmission, and 200kg of graphite is added through the high-level material bin, and the furna...

Embodiment 3

[0033] Embodiment 3: Angang 100-ton electric furnace uses all scrap steel to smelt ship plate steel ship plate A of the present invention

[0034] Two baskets of material are loaded, with a total load of 132 tons. The first basket weighs 74 tons, of which 18 tons of pig iron are added. Before loading, 500kg of graphite and 800kg of lime are added to the furnace through the high-level silo, and the arc is started at 7 levels of voltage. , after the arc start is stable, the voltage level of 9~11 is transmitted, and the oxygen oil burner and the furnace wall oxygen gun are turned on after the power transmission of 4MWh. After the first batch of material in the furnace is empty, add the second basket of material, and the arc is still started at the 7th gear voltage. After the arc is stable, the 9th to 11th gear voltage level is used for power transmission. After the power supply, the furnace door gun assists the furnace wall oxygen gun to blow oxygen. , the total oxygen blowing vo...

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Abstract

The invention discloses an electric furnace steel-making method utilizing like graphite to replace pig iron to match with carbon. The like graphite with a certain shape is used for partly or entirely replacing raw steel, and the like graphite is added by a material basket or directly added into the furnace by an overhead bunker to perform steel-making production. The invention can reduce the cost of the electric furnace steel making, and is suitable for an electric furnace steel making process.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to an electric furnace steelmaking method in which quasi-graphite is used instead of pig iron to mix carbon. Background technique [0002] The smelting process of the electric arc furnace needs to add a certain amount of carbon to carry out the carbon-oxygen reaction, release heat and generate CO bubbles, and generate kinetic energy during the floating process of the CO bubbles, which can stir the molten pool to promote mass transfer and heat transfer, and generate foam slag submerged arc to improve thermal efficiency , Degassing and inclusion removal, that is, the carbon-oxygen reaction is a necessary condition for promoting the melting of scrap steel and slag, promoting the temperature rise of molten steel, and providing the thermodynamic conditions and kinetics of smelting such as P removal, degassing, and removal of inclusions. [0003] At present, electric arc furnace steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 张殿军胡俊邦姬健营王翔彭家清
Owner ANYANG IRON & STEEL
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