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Ladle top slag deoxidation modifier for ultralow carbon steel, and use method thereof

A technology for ladle top slag and ultra-low carbon steel is applied in the field of deoxidizing modifier, ladle top slag deoxidizing modifier for ultra-low carbon steel, and ladle top slag modifier, which can solve the problem of easily polluting the environment and complex preparation process , the problem of high production cost, to achieve the effects of rapid slag formation, improved cleanliness, and reduced temperature drop

Inactive Publication Date: 2018-05-11
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a ladle top slag deoxidation modifier for ultra-low carbon steel and its use method, which mainly solves the complicated preparation process, high production cost and high production cost of the existing ladle top slag modifier for ultra-low carbon steel. The technical problem of easily polluting the environment during use; the present invention reduces the Σ(FeO+MnO)% content in the ladle top slag to reduce the oxidation of the ladle top slag and improve the cleanliness of molten steel. It is convenient to process, efficient and practical, low in cost, environmentally friendly

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0041] The preparation method of the above-mentioned ladle top slag deoxidation modifier for ultra-low carbon steel, the method comprises:

[0042] 1) Batching, weighing electrolytic aluminum scrap, limestone, quicklime, aluminum ash, fluorite, waste magnesia carbon brick and soda ash according to the proportion, and mixing to obtain a mixed material. The weight percentage of the mixed material components is: electrolytic aluminum Edge material 20-27%, limestone 23-30%, quicklime 3-7%, aluminum ash 7-14%, fluorite 6-9%, waste magnesia carbon brick 5-10%, soda ash ≤ 6%;

[0043] 2) Grind the mixed material finely, and control the particle size of the mixed material to be less than or equal to 1mm;

[0044] 3) Using a ball pressing machine to press the compounded material ground into step 2) into a composite ball with a diameter of 5-10 mm to obtain a finished product.

[0045] Table 3 is the raw material ratio (by weight percentage) of the ladle top slag deoxidation modifier o...

Embodiment 1

[0048] Example 1: After the converter smelting is completed, a sliding plate is used to stop the slag and tap the steel. The tapping volume is 255 tons, and the tapping temperature is 1672°C. Turn on argon blowing at the bottom of the ladle, and start adding 600Kg of desulfurized lime after the bottom of the ladle is covered with molten steel. The chemical composition of the molten steel in the ladle is shown in Table 4, and the composition of the ladle top slag is shown in Table 5. ; After tapping temperature and sampling, quickly add the reforming agent of the present invention to the ladle top slag on the slag surface of the ladle to deoxidize and improve the quality, and the input amount is 50% of the total slag amount, i.e., 159Kg, which is manually input Ladle top slag modifier without adding covering agent, and then go to the RH station for refining treatment, and test the content of Σ(FeO+MnO)% in the slag after adding the modifier when the RH exits the station. It can...

Embodiment 2

[0049] Example 2, after the converter smelting is completed, a sliding plate is used to stop the slag and tap the steel. The tapping volume is 273 tons, and the tapping temperature is 1672°C. Turn on argon blowing at the bottom of the ladle, and start adding 600Kg of desulfurized lime after the bottom of the ladle is covered with molten steel. The chemical composition of the molten steel in the ladle is shown in Table 4, and the composition of the ladle top slag is shown in Table 5; After tapping temperature and sampling, quickly add the modifier of the present invention on the slag surface of the ladle to deoxidize and modify the top slag of the ladle, and the input amount is 54% of the total slag amount, that is, 210Kg is put into the ladle manually Top slag modifier, without adding covering agent, then go to the RH station for refining treatment, and test the content of Σ(FeO+MnO)% in the slag after adding the modifier when the RH exits the station. It can be seen that afte...

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Abstract

The invention relates to a ladle top slag deoxidation modifier for ultralow carbon steel, and a use method thereof. The technical problems of complex preparation process, high production cost and easyenvironment pollution during use of existing ladle top slag modifiers for ultralow carbon steel are mainly solved. The ladle top slag deoxidation modifier for ultralow carbon steel comprises 18-28 wt% of Al, 20-30 wt% of CaCO3, 3-7 wt% of CaO, 5-10 wt% of Al2O3, 5-9 wt% of CaF2, 5-8 wt% of MgO, 6 wt% or less of Na2CO3, and the balance of inevitable impurities; and the particle size of all components in the ladle top slag deoxidation modifier is less than or equal to 1 mm. The modifier can significantly improve the slag crusting problem of the ladle and improve the fluidity of molten steel.

Description

technical field [0001] The invention relates to a ladle top slag modifier in the process of producing ultra-low carbon steel, in particular to a ladle top slag deoxidation modifier for ultra-low carbon steel and its use method, in particular to a converter smelting terminal The invention discloses a deoxidizing modifier for eliminating the oxidative property of ladle top slag during tapping and a method for using the same, belonging to the technical field of steelmaking and refining. Background technique [0002] In the production of ultra-low carbon steel, due to its extremely low carbon content, it is generally necessary to reduce the end point carbon to less than 0.03%, so according to the principle of C-O balance, the oxygen in molten steel is generally 600-700ppm, and the oxidative property of molten steel is relatively high. Strong, while converter slag also has strong oxidizing properties. At the end of BOF tapping, although most steelmakers use sliding plates or sla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06B22D1/00
CPCC21C7/06B22D1/00C21C7/0075
Inventor 李玉娣倪修华
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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