Ladle covering flux and use method thereof

A technology of ladle covering agent and molten steel, which is applied in the direction of improving process efficiency to achieve the effects of reducing electrode and material consumption, protecting the environment and reducing temperature drop

Active Publication Date: 2011-06-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the transportation of the ladle from the converter to the refining location, the heat of molten steel is transmitted to the air through the ladle and top slag, resulting in a temperature drop of 30-50°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] When the converter is tapping, the carbon content is 0.29%, and the molten steel temperature is 1635°C. After the converter tapping, add 2.5Kg of the present invention's ladle covering agent per ton of steel in the ladle, and the particle size is 0~80mm, wherein lime accounts for 91% (oxidized Calcium content is 91%), calcium carbide accounts for 9% (calcium carbide content is 76%), after the converter is tapped, it is transferred to the refining furnace. The temperature measured in the furnace reaches 1613°C, and the temperature drops to 22°C.

Embodiment 2

[0019] When the converter is tapping, the carbon content is 0.15%, and the molten steel temperature is 1628°C. After the converter tapping, add the ladle covering agent of the present invention per ton of steel 3.5Kg in the ladle, and the particle size is 0~80mm, wherein lime accounts for 94% (oxidized Calcium content is 91%), and calcium carbide accounts for 6% (calcium carbide content is 76%). After tapping from the converter, it is transferred to the refining furnace. The temperature measured in the furnace reaches 1602°C, and the temperature drops to 26°C.

Embodiment 3

[0021] When the converter is tapping, the carbon content is 0.35%, and the molten steel temperature is 1636°C. After the converter tapping, add the ladle covering agent of the present invention per ton of steel 4.5Kg in the ladle, and the particle size is 0~80mm, wherein lime accounts for 95.5% (oxidized Calcium content is 91%), and calcium carbide accounts for 4.5% (calcium carbide content is 76%). After tapping from the converter, it is transferred to the refining furnace. The temperature measured in the furnace reaches 1609°C, and the temperature drops to 27°C.

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Abstract

The invention relates to a ladle covering flux for preventing temperature drop of the molten steel after treatment with a converter, which is characterized in that the ladle covering flux mainly consists of the following components in percentage by weight: 91-99% of lime and 1-9% of calcium carbide. In the use method of the ladle covering flux, 1-8 Kg of the ladle covering flux is added to every ton of molten steel, and the granularity is 0-100 mm. In the use method of the ladle covering flux, 1-8 Kg of the ladle covering flux is added to every ton of molten steel, and the granularity is 0-80mm; the argon can blown after producing steel and in the process of transferring; and the upper limit of the argon flow is reached when the surface of the steel liquid does not turn. The ladle covering flux and use method provided by the invention have the advantages that: air isolation and heat preservation are ensured; the temperature drop in the process of transferring the molten steel is reduced through the exothermic reaction of calcium carbide in the covering flux and the oxygen in the molten steel, the electrode consumption is reduced, and the environment is protected; and as the calcium carbide further reacts with the oxygen and sulfur in the steel, the covering flux also has the effects of deoxidation and desulfurization.

Description

technical field [0001] The invention relates to the field of molten steel treatment in the steelmaking process, in particular to a ladle covering agent for preventing the temperature drop of molten steel after a converter furnace and its application method. Background technique [0002] The main purpose of ladle covering agent used in converter tapping is to isolate molten steel and air, avoid oxidation of molten steel, and play a certain role in heat preservation. However, during the transportation of the ladle from the converter to the refining location, the heat of molten steel is transferred to the air through the ladle and top slag, resulting in a temperature drop of 30-50°C. In this case, after reaching the refining position, it usually takes a long time to heat up before refining. [0003] In the prior art, the ladle covering agent is mostly based on desulfurization and deoxidation, and the ladle covering agent that makes molten steel heat up is also rare, such as: C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111C21C7/076
CPCY02P10/20
Inventor 耿继双郭大勇李德刚马成任玉辉高航常桂华薛军王秉喜
Owner ANGANG STEEL CO LTD
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