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De-oxidation modifying agent for steel ladle top slag

A ladle top slag and modifier technology, applied in the direction of improving process efficiency, etc., can solve the problems of increasing the oxygen level of molten steel, secondary oxidation of molten steel, unfavorable desulfurization of molten steel, etc., to prevent adsorption and ensure reducibility , good reductive effect

Active Publication Date: 2015-04-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The converter slag entering the ladle is oxidizing. During the subsequent refining process, the oxygen in the slag diffuses to the molten steel, increasing the oxygen level of the molten steel, causing secondary oxidation of the molten steel, polluting the molten steel, and is not conducive to the desulfurization of the molten steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: After the converter smelting is completed, about 0.77t of CaO is spread on the bottom of the ladle to stop the slag and tap the steel. The steel output of the converter is 295t, and when the steel output is 2 / 3, 3t of ferromanganese, 1.6t of aluminum silicon manganese and 0.2t of aluminum iron alloy are added to carry out composite deoxidation of molten steel. After tapping, 0.47t of the modifying agent of the present invention is quickly added to the slag surface of the ladle to deoxidize and modify the top slag of the ladle. It can be seen that after the slag is added to the ladle, it quickly spreads on the slag surface, and the slag is completely melted within 3.1 minutes. In the slag: %SiO 2 =12.09, %Al 2 o 3 =41.99, %CaO=33.1, %MgO=4.95, %MnO=1.74, %FeO=0.21, (%FeO)+(%MnO)2 =10.93, %Al 2 o 3 =38.68, %CaO=36.30, %MgO=6.18, %MnO=1.41, %FeO=0.20, due to the existence of a small amount of carbon particles in the slag, the top slag remains reductive, and ...

Embodiment 2

[0041]Example 2: After the converter smelting is completed, about 0.7t of CaO is spread on the bottom of the ladle to stop the slag and tap the steel. The steel tapping amount of the converter is 300t, and when the steel tapping amount is 2 / 3, 3.1t of ferromanganese, 0.4t of ferrosilicon and 0.45t of aluminum are added to perform compound deoxidation on the molten steel. After tapping, 0.44t of the modifying agent of the present invention is quickly added to the slag surface of the ladle to deoxidize and modify the top slag of the ladle. It can be seen that after the slag is added to the ladle, it quickly spreads on the slag surface, and the slag is melted within 2.6 minutes. The main composition of the ladle top slag is: %SiO 2 =9.45, %Al 2 o 3 =46.46, %CaO=36, %MgO=3.67, %MnO=1.49, %FeO=0.09, (%FeO)+(%MnO)2 =8.80, %Al 2 o 3 =34.96, %CaO=45.64, %MgO=4.47, %MnO=1.22, %FeO=0.11, due to the existence of a small amount of carbon particles in the slag, the slag remains reducti...

Embodiment 3

[0042] Example 3: After the converter smelting is completed, about 0.3t of CaO is spread on the bottom of the ladle to stop the slag and tap the steel. The steel output of the converter is 300t, and when the steel output is 2 / 3, 2.0t of electrolytic manganese, 2.5t of silicon manganese and 1.3t of aluminum and iron are added to carry out composite deoxidation of molten steel. After tapping, 0.42t of the modifying agent of the present invention is quickly added to the slag surface of the ladle to deoxidize and modify the top slag of the ladle. It can be seen that after the slag is added to the ladle, it quickly spreads on the slag surface, and the slag is melted within 2.5 minutes. The main component of the ladle top slag is: %SiO 2 =8.30, %Al 2 o 3 =46.68, %CaO=33.14, %MgO=5.44, %MnO=1.99, %FeO=0.21, (%FeO)+(%MnO)2 =7.66, %Al 2 o 3 =28.14, %CaO=50.68, %MgO=5.50, %MnO=1.73, %FeO=0.23, due to the presence of a small amount of carbon particles in the slag, the slag remains re...

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Abstract

The invention relates to steel ladle furnace slag modifying agent in a converter steel tapping process. The de-oxidation modifying agent for the steel ladle top slag comprises the following main components in percentage by weight: 30%-50% of Al, 50%-30% of CaO, 5.0%-8.0% of Al2O3, not more than 3.0% of SiO2, not more than 0.07% of S+P, 0.7%-1.4% of C, 3.0%-8.0% of CaFe2 and not more than 0.2% of H2O. The modifying agent disclosed by the invention is a reductive modifying agent which can be used for solving an oxidation problem of the steel ladle top slag in a low-carbon pipeline steel production process, so that guarantee is provided for vacuum desulfurization and pure production of the pipeline steel.

Description

technical field [0001] The invention relates to a ladle slag modifying agent in the tapping process of a converter. Background technique [0002] At the end of the converter tapping process, the slag in the furnace will inevitably be carried into the ladle by the molten steel. The converter slag entering the ladle is oxidizing. During the subsequent refining process, the oxygen in the slag diffuses to the molten steel, increasing the oxygen level of the molten steel, causing secondary oxidation of the molten steel, polluting the molten steel, and is not conducive to the desulfurization of the molten steel. . Therefore, adding a modifier to the ladle during the tapping process of the converter to modify the converter slag carried into the ladle to reduce its oxidation and improve the ability of the top slag to absorb inclusions is an important means of smelting pure steel. For the low-carbon pipeline steel produced by converter-RH process, the reforming effect of conver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/04C21C7/06C21C7/076
CPCY02P10/20
Inventor 胡汉涛蒋晓放黄宗泽周继刚王俊凯
Owner BAOSHAN IRON & STEEL CO LTD
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