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Refining method for molten steel

A technology of molten steel and refining slag, applied in the field of iron and steel smelting, can solve the problems of hard slag, insufficient adsorption capacity of inclusions, high FeO content, etc., achieve the effect of reducing inclusion defects and improving the capacity of slag to absorb inclusions

Inactive Publication Date: 2018-01-23
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Whether it is LF refining or RH refining, it is necessary to add a modifier to modify the top slag of the ladle, especially the molten steel smelted in the existing steelmaking converter. The CaO ratio in the ladle slag after tapping is high, resulting in iron The calcium phase is high, the FeO content is high, and there are problems in the refining process of molten steel, such as slag hardening and insufficient adsorption and inclusion capacity, resulting in subsequent products that cannot meet the corresponding requirements, especially the requirements of automotive steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Ultra-low carbon automotive panel DC06 steel produced by Pangang Group Xichang Steel and Vanadium Co., Ltd. The production process is converter-LF-RH-casting machine.

[0064] DC06 is the production furnace of automobile panel steel. During the tapping process, 500kg of active lime is added to each furnace. After the converter is tapped, the molten steel is hoisted to LF for processing. During the LF heating process, 15-20kg / t of tailing slag for making alloys is added, and 500-1500kg / furnace of active lime is added during the treatment process for submerged arc heating to prevent nitrogen increase. Using SiO in ladle slag 2 , FeO and Al in tailings 2 o 3 To carry out the reaction, the electric arc in the heating process promotes the dissolution of the tailings, and produces a slag phase with a low melting point and an appropriate proportion of members. Usually, in order to ensure a reasonable slag phase, when 600kg of lime is added, the amount of tailings should be...

Embodiment 2

[0067] Low-carbon aluminum DC01 steel for home appliances produced by Pansteel Group Xichang Steel and Vanadium Co., Ltd. The production process is converter-RH-casting machine.

[0068] DC01 home appliance plate steel production furnace, adding active lime 500kg / furnace during the tapping process, adding 300kg tailing slag for making alloys during the tapping process, using SiO2, FeO in the ladle slag and Al in the tailing slag 2 o 3 Carry out the reaction, use the heat flow stirring in the tapping process to promote the dissolution of tailing slag, produce a slag phase with a low melting point and a suitable ratio of members, add a modifier containing aluminum balls to the ladle after tapping to deoxidize the slag, and the dosage is 200kg / furnace. Usually, the proportion of lime and tailings is controlled in the range of 3:1 to 2:1 to ensure that the CaO content in the slag is controlled at 30% to 45%, and the Al 2 o 3 Controlled at 20-35%, the formed 12(CaO)·7(Al 2 o ...

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Abstract

The invention provides a refining method for molten steel. The method comprises the step of firstly refining the molten steel, a modifier and refining slag, thereby acquiring the refined molten steel.The modifier comprises alloy tailings prepared through the thermite process or the alloy tailings prepared through the thermite process and Al2O3. According to the method, the tailings are selected from the wastes difficult to be treated and the tailings generated from the waste alloy prepared through the thermite process are used for refining the molten steel, so that the top residue of the steel ladle is modified, the capability of the slag for adsorbing the impurities is improved and the recycling of the solid wastes is realized. Meanwhile, the refining method adopts a simple process, no additional production equipment is required, the condition is reasonable and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a method for refining molten steel, in particular to a method for using tailing slag produced by aluminothermic alloying for molten steel refining. Background technique [0002] With the rapid development of iron and steel production technology, the production of iron and steel industry has developed to reduce the total amount, increase the variety, improve the grade and save energy and reduce emissions. It has become the consensus to maintain the sustainable development of the industry to do fine and clean steel industry . Molten steel refining, in the modern steelmaking process, the molten steel is mainly refined outside the furnace, which is usually carried out in the ladle. Blocking slag when tapping, adding refining slag to the ladle, also known as ladle refining, is mainly used to refine the molten steel melted in the primary smelting furnace (electric arc fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C21C7/06C21C7/10
CPCY02P10/20
Inventor 张彦恒
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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