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Steelmaking and slagging method

A technology for slagging and steelmaking furnaces, which is applied in the field of metallurgy, can solve problems such as difficulties in slag formation, and achieve the effects of avoiding equipment corrosion and environmental pollution, prolonging furnace life, and improving dephosphorization

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

[0033] This example is used to illustrate the steelmaking slagging method provided by the present invention.

[0034] Steel of U75 grade is smelted on a new 120-ton converter. Add 130.6 tons of vanadium-extracted semi-steel and 7 tons of steel scrap into the converter, and the furnace temperature of the vanadium-extracted semi-steel is 1320°C. Add 1250 kg of lime, 1250 kg of high magnesium lime, 500 kg of flux, 1700 kg of acid composite slag and 800 kg of graphite-like 1 minute after the start of blowing, and form primary slag and primary slag alkali 4 minutes and 30 seconds after blowing starts. The degree is 3.6. 7 minutes after the start of blowing, add 625 kg of lime and 625 kg of high-magnesia lime; 9 minutes after the start of blowing, add 625 kg of lime and 625 kg of high-magnesia lime, and continue blowing for 12 minutes , to obtain molten steel and final slag, the tapping temperature of molten steel is 1685 ℃, the tapping weight of molten steel is 130.72 tons, the b...

Embodiment 2

[0036] This example is used to illustrate the steelmaking slagging method provided by the present invention.

[0037] Steel of U71 steel grade is smelted on a new 120-ton converter. Add 140 tons of vanadium-extracted semi-steel and 5 tons of steel scrap into the converter, and the furnace temperature of the vanadium-extracted semi-steel is 1300°C. Add 1395 kg of lime, 1375 kg of high magnesium lime, 1020 kg of flux, and 1600 kg of acidic composite slag 1 minute after the start of blowing. The primary slag is formed 4 minutes and 33 seconds after the start of blowing, and the basicity of the primary slag is 3.5. 6 minutes after the start of blowing, add 697 kg of lime and 688 kg of high-magnesia lime; 8 minutes after the start of blowing, add 697 kg of lime and 688 kg of high-magnesia lime, and continue blowing for 12.5 minutes , to obtain molten steel and final slag, the tapping temperature of the molten steel is 1682°C, the tapping weight of the molten steel is 136.3 tons, t...

Embodiment 3

[0039] This example is used to illustrate the steelmaking slagging method provided by the present invention.

[0040] The steel of YQ450 steel grade is smelted on a new 120-ton converter. Add 133 tons of vanadium-extracted semi-steel and 4 tons of steel scrap into the converter, and the furnace temperature of the vanadium-extracted semi-steel is 1360°C. Add 1300 kg of lime, 1350 kg of high magnesium lime, 1045 kg of flux, and 1500 kg of acidic composite slag within 1 minute after blowing starts. Primary slag is formed 4 minutes and 35 seconds after blowing starts, and the basicity of the primary slag is 3.65. 6.5 minutes after the start of blowing, add 650 kg of lime and 675 kg of high-magnesia lime; 8 minutes after the start of blowing, add 650 kg of lime and 675 kg of high-magnesia lime, and continue blowing until 12.6 minutes , to obtain molten steel and final slag. The tapping temperature of the molten steel is 1690°C, the tapping weight of the molten steel is 134.42 ton...

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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 9 to 11kg of lime, 9 to 11kg of high-magnesium lime, 3 to 8kg of fluxing agent, and 11 to 14kg of acid composite slag into the steel refining furnace based on one ton of semisteel from which vanadium is extracted; and in 9 minutes after the first slag is formed and blowing is started, adding 9 to 11kg of lime and 9 to 11kg 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, smelting time is shortened 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] Slagging is an indispensable high-temperature chemical reaction process in converter steelmaking. In the steelmaking process, slag is the controller of chemical reactions and heat transfer in the converter. The task of converter steelmaking is to obtain qualified molten steel with certain composition and temperature requirements by obtaining slag with certain chemical and physical properties. And the slag is made well, which can effectively ensure the smooth blowing process and smooth operation, reduce the splashing and back-drying phenomenon in the blowing process, the molten steel temperature rises rapidly, and ensure the maximum removal of harmful impurities in the steel, and the minimum metal burning loss. Increased metal yield. [0003] In the traditional steelmaking process at home and abroad, fluor...

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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