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Device and method for removing inclusions through refined bubbles

A technology of inclusions and refining gas, which is applied in the fields of electromagnetic metallurgy and steelmaking, can solve the problems of easy corrosion and damage of the agitator, and achieve the effects of reducing the total amount of gas blowing, prolonging the residence time, and reducing the temperature drop

Inactive Publication Date: 2016-06-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When mechanically stirring molten steel, the agitator is easily corroded and damaged in high temperature molten steel, so it is rarely used in actual production

Method used

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  • Device and method for removing inclusions through refined bubbles
  • Device and method for removing inclusions through refined bubbles
  • Device and method for removing inclusions through refined bubbles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] For a small-sized crucible containing molten metal, such as a crucible containing 500 kg of molten steel, the electromagnetic stirrer 4 can be placed near the bottom of the crucible near the breathable brick 3 to promote the flow of molten steel. The magnetic induction intensity of electromagnetic stirring is about 0.005-0.04T , The flow velocity of molten steel is about 0.2 ~ 1.5m / min. The electromagnetic braking magnetic field generator 2 is placed in the middle of the crucible. The casing of the electromagnetic braking magnetic field generator 2 is 950mm long, 550mm wide, and 700mm high. The box body 8 is made of white steel with a thickness of 2 mm. Because the brake iron core 8 and the brake coil 9 are heavier, about 200kg, there is a need to use channel steel as the skeleton inside the casing 10 to play a supporting role, and the suspension ring 7 is installed to facilitate transportation and installation. Depending on this device, the strongest magnetic field o...

Embodiment 2

[0030] Use 100 tons of ladle 1, use bottom blowing argon gas to purify molten steel, electromagnetic stirrer 4 is near the ventilating brick 3 at the bottom of ladle 1, stir molten steel, when the magnetic induction intensity near ventilating brick 3 reaches 0.005T, the flow speed of molten steel can reach 0.5m / min or more. The size of the electromagnetic braking magnetic field generator 2 is about 2m×1.5m×2m, and two sets of electromagnetic braking magnetic field generators 2 can be placed in pairs on both sides of the ladle 1, which can increase the penetration depth of the electromagnetic field and is beneficial to the ladle. 1 Electromagnetic braking of the middle molten steel. The magnetic field strength generated in molten steel reaches about 0.005-0.02T. Using the device within the same blowing time can increase the removal efficiency of small-sized inclusions (<5 μm) in molten steel by more than 30%, and can shorten the refining time, reduce the temperature drop of m...

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Abstract

The invention provides a device and method for removing inclusions through refined bubbles. The device comprises a steel containing bucket, electromagnetic brake magnetic field generators and an electromagnetic stirrer. The electromagnetic brake magnetic field generators are arranged on the side face of the steel containing bucket, and the electromagnetic stirrer is arranged on the periphery of a bottom air brick of the steel containing bucket. The steel containing bucket containing molten steel is placed between the two electromagnetic brake magnetic field generators, and the electromagnetic stirrer is mounted on the periphery of the bottom air brick of the steel containing bucket. After an air blowing valve is opened, the electromagnetic stirrer and the electromagnetic brake magnetic field generators are started, and through electromagnetic stirring, the flowing speed of the molten steel near the air brick is increased, and small bubbles can be generated; the electromagnetic brake magnetic field generators are used for restraining the flowing speed of the molten steel on the middle and upper portions of the steel containing bucket, so that the staying time of the bubbles is prolonged. When the content of small-size inclusions in the molten steel meets the requirement, air blowing is stopped, and the electromagnetic brake magnetic field generators and the electromagnetic stirrer are turned off. By means of the device and method, the efficiency of capturing the inclusions smaller than 5 micrometers of the bubbles can be improved, temperature decrease and the total air blowing amount are reduced, and energy and resources are saved.

Description

technical field [0001] The invention belongs to the fields of electromagnetic metallurgy and steelmaking, and in particular relates to a device and method for removing inclusions in molten steel by refining air bubbles. Background technique [0002] In order to provide steel products with higher performance and high reliability than before, many steel products such as automotive sheet, steel cord, and electrical steel need to continuously improve the cleanliness level of the final product. Inclusions are the main impurities that endanger the quality of molten steel and steel, and removing as many inclusions as possible is one of the main goals of steelmaking. Among the many methods for removing inclusions, the bubble flotation method is considered to be the most promising, because some harmful inclusions such as Al 2 o 3 It has a large contact angle and is easily captured by air bubbles. [0003] In the jet purification process, the fine air bubbles dispersedly distribute...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/02
Inventor 郭庆涛廖相巍曹东贾吉祥唐雪峰黄玉平张宇
Owner ANGANG STEEL CO LTD
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