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Steelmaking and slagging method

A slag-making and steel-making furnace technology, applied in the field of metallurgy, can solve problems such as difficulty in slag formation, avoid equipment corrosion and environmental pollution, prolong furnace life, and improve dephosphorization effects

Inactive Publication Date: 2013-04-10
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the shortcoming of difficult slag formation existing in semi-steel steelmaking in the prior art, and provides a steelmaking slag-making method capable of rapid slag formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This example is used to illustrate the steelmaking slagging method provided by the present invention.

[0035] Smelt Q235(G) steel grade steel on a new 120-ton converter. Add 131 tons of vanadium-extracted semi-steel and 9 tons of steel scrap into the converter, and the furnace temperature of the vanadium-extracted semi-steel is 1300°C. Add 1,000 kg of lime, 800 kg of high-magnesia lime, 1,000 kg of flux, 1,600 kg of acidic composite slag and 1,000 kg of graphite-like slag within 1 minute after blowing begins. Alkalinity is 3.6. 6.5 minutes after the start of blowing, add 500 kg of lime and 400 kg of high-magnesia lime; 8 minutes after the start of blowing, add 500 kg of lime and 400 kg of high-magnesia lime, and continue blowing for 12 minutes , to obtain molten steel and final slag. The tapping temperature of the molten steel is 1675°C, the tapping weight of the molten steel is 128.8 tons, the basicity of the final slag is 4.0, the total iron in the final slag is 1...

Embodiment 2

[0037] This example is used to illustrate the steelmaking slagging method provided by the present invention.

[0038] Steel of the Stb32 grade is smelted on a new 120-ton converter. Add 143 tons of vanadium-extracted semi-steel into the converter, and the temperature of entering the furnace for the vanadium-extracted semi-steel is 1280°C. Add 900 kg of lime, 900 kg of high magnesium lime, 1,300 kg of flux, and 1,620 kg of acidic composite slag 1 minute after the start of blowing. The primary slag is formed 4 minutes and 10 seconds after the start of blowing, and the basicity of the primary slag is 3.44. 6 minutes after the start of blowing, add 450 kg of lime and 450 kg of high-magnesium lime; 7 minutes after the start of blowing, add 450 kg of lime and 450 kg of high-magnesia lime, in which the sludge ball is blowing Add when refining to 10.5 minutes, continue blowing to 11.8 minutes, obtain molten steel and final slag. The tapping temperature of the molten steel is 1687°C,...

Embodiment 3

[0040] This example is used to illustrate the steelmaking slagging method provided by the present invention.

[0041] Steel of PG40 grade is smelted on a new 120-ton converter. Add 130 tons of vanadium-extracted semi-steel and 6 tons of steel scrap into the converter, and the furnace temperature of the vanadium-extracted semi-steel is 1330°C. Add 800 kg of lime, 950 kg of high magnesium lime, 1450 kg of flux, 1560 kg of acid composite slag and 500 kg of graphite 1 minute after the start of blowing. Alkalinity is 3.52. 6 minutes after the start of blowing, add 450 kg of lime and 300 kg of high-magnesia lime; 7 minutes after the start of blowing, add 450 kg of lime and 350 kg of high-magnesia lime, and continue blowing until 12.3 minutes , to obtain molten steel and final slag. The tapping temperature of the molten steel is 1670°C, the tapping weight of the molten steel is 125.12 tons, the basicity of the final slag is 4.2, the total iron in the final slag is 20%, and the oxy...

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PUM

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Abstract

The invention provides a steelmaking and slagging method. The method comprises the following steps of: adding semisteel from which vanadium is extracted into a steel refining furnace; blowing oxygen into the steel refining furnace and blowing; in two minutes after the blowing is started, adding 6 to 8.5kg of lime, 4 to 7.5kg of high-magnesium lime, 5 to 11.5kg of fluxing agent, and 11 to 16kg of acid composite slag into the steel refining furnace based on one ton of semisteel from which vanadium is extracted; and in eight minutes after the first slag is formed and blowing is started, adding 6to 8.5kg of lime and 4 to 7.5kg of high-magnesium lime into the steel refining furnace based on one ton of semisteel from which vanadium is extracted, and continuously blowing to obtain molten steel and final slag. The fluxing agent is refined steel slag. Slagging is performed by the method, the slag can be formed quickly, the consumption of an iron and steel material is reduced, the furnace lifeof the steel refining furnace is prolonged, the equipment is prevented from being corroded and environmental pollution is avoided and steelmaking cost is saved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a method for making slag from steelmaking. Background technique [0002] The main reason affecting lime melting in the early stage of blowing is that 2CaOSiO with high melting point is first formed at the interface of liquid slag and lime. 2 , when SiO 2 When the content exceeds 25%, the melting of lime decreases. Therefore, in order to accelerate the melting of lime, it is necessary to add 2CaOSiO 2 The melting point of the flux. [0003] In the traditional steelmaking process at home and abroad, fluorite is used as the main flux for converter steelmaking slag dephosphorization, and its main component is calcium fluoride. It can accelerate the melting of calcium and improve the fluidity of slag to improve the dephosphorization effect. However, there are certain limitations in using fluorspar as a slagging agent for steelmaking converters. On the one hand, the fluorine in fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36
Inventor 陈永梁新腾曾建华李安林李桂军杨森祥李清春
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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