Unlock instant, AI-driven research and patent intelligence for your innovation.

Bottom powder spraying/vacuum degassing molten steel refining device and method

A technology of vacuum degassing and powder spraying, applied in the direction of reducing gas emissions, can solve the problems of shortening the service life of the spray gun, unfavorable production and secondary pollution, etc., to eliminate the inhomogeneity of steel temperature and composition, to speed up the phase The effect of mass transfer and heat transfer rate, slag utilization improvement

Active Publication Date: 2014-08-20
NORTHEASTERN UNIV LIAONING
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this method stirs by increasing the flow rate of argon, the surface of the molten steel is exposed, resulting in oxidation of the molten steel; and the powder added from the top may partly fall on the slag layer, which cannot be integrated into the molten steel, affecting operations such as alloying
When the vacuum degassing refining method is combined with powder spraying equipment for desulfurization and inclusion removal, argon is used as the carrier, and the powdery refining agent is sprayed into the molten steel through the immersion spray gun. Since the spray gun is a consumable spare part, the price is relatively high. The service life is directly related to the cost of the refining process, and when the spray gun is inserted into the molten steel, it will inevitably contact with the molten slag to cause slag leaching. It may change, causing the immersion of the spray gun to be either too deep or too shallow, which affects the stability of the operation and is not conducive to smooth production; and once a power failure occurs during injection, not only the spray gun is damaged, but the entire ladle of molten steel may be scrapped. Type spray gun will also bring problems such as splashing or serious secondary pollution of molten steel

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Bottom powder spraying/vacuum degassing molten steel refining device and method
  • Bottom powder spraying/vacuum degassing molten steel refining device and method
  • Bottom powder spraying/vacuum degassing molten steel refining device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A bottom-spraying vacuum degassing method VAD-BPI for refining molten steel, specifically taking 28t bottom-spraying VAD-BPI method for refining WFG36G steel as an example. The VAD method, also known as the vacuum arc degassing refining furnace steelmaking method, belongs to a commonly used refining method of the vacuum degassing and refining molten steel method. Bottom spraying element 7 adopts linear slit type bottom spraying element, the width of the slit 18 is 0.13mm, the length is 15mm, and the number of strips is 16. They are arranged symmetrically and radially around the center. One bottom spraying element is used and arranged in the ladle furnace 12 At the center of the bottom, argon is used as the blowing gas, and 300-mesh aluminum powder is used as the blowing powder.

[0057] (1) When the steel is tapped from the primary smelting furnace, the slag is removed by 60%~70%, the temperature is controlled at 1650°C, and the sampling test is carried out. [C] is cont...

Embodiment 2

[0064] A bottom powder spraying vacuum degassing and refining method VAD-BPI for molten steel, specifically taking 85t bottom powder spraying VAD-BPI method for refining low alloy steel as an example. The VAD method, also known as the vacuum arc degassing refining furnace steelmaking method, belongs to a commonly used refining method of the vacuum degassing and refining molten steel method. The bottom powder spraying element 7 adopts a linear slit type bottom powder spraying element. The width of the gap 18 is 0.13mm, the length is 15mm, and the number of strips is 18. They are arranged symmetrically and radially around the center. One bottom powder spraying element is used and arranged in the ladle furnace 12 At the center of the bottom, argon was used as the sparging gas.

[0065] (1) The primary smelting furnace is tapped, 60%~70% of the slag is removed, the temperature is controlled at 1570°C, and the sampling inspection is carried out. [S] is controlled within 0.015%, [C]...

Embodiment 3

[0073] A method VOD-BPI for refining molten steel by vacuum degassing with bottom powder spraying, specifically taking 60t bottom powder spraying VOD-BPI method for refining ultra-low carbon alloy steel as an example. The VOD method is also called the vacuum oxygen blowing decarburization method, which belongs to the commonly used refining method of the vacuum degassing and refining molten steel method. The bottom powder spraying element adopts a linear slit type bottom powder spraying element 7, the width of the gap 18 is 0.13mm, the length is 15mm, and the number of strips is 20, which are arranged symmetrically and radially around the center. One bottom powder spraying element 7 is used to arrange the ladle furnace 12 Argon is used as the blowing gas at the center of the furnace bottom, and 300-mesh aluminum powder is used as the deoxidizer.

[0074] (1) Steel is tapped from the primary smelting furnace, 60%~70% of slag is removed, the temperature is controlled at 1640°C, and...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of iron and steel refining, and particularly relates to a device and method for refining molten steel with bottom powder spraying and vacuum degassing. The device includes a vacuum degassing refining furnace and a bottom powder spraying element. The bottom powder spraying element is built on the vacuum degassing The bottom of the ladle furnace of the gas refining furnace runs through the bottom of the ladle furnace. The upper end of the bottom powder spraying element is in contact with the liquid steel, and the lower end is connected to the gas storage chamber of the powder spraying element through a flange or directly welded to the gas storage chamber. The lower end of the gas storage chamber Connect to the powder spraying system through the powder air flow conveying pipe. The method is to first remove the slag, take samples and measure the temperature, then blow the gas into the molten pool through the bottom powder spraying element. The ladle furnace is hoisted into the vacuum chamber, a rough vacuum is drawn, the refining powder and alloying powder are sprayed, a high vacuum is drawn, and the aluminum powder is placed on the load. Driven by the air flow, it enters the molten pool through the bottom powder spraying element, closes the powder spraying system, stops the gas injection system, inflates to release the vacuum, and begins casting. The invention reduces production costs, improves operating safety and individual steel production quality, and greatly improves alloy yield and slag utilization rate.

Description

technical field [0001] The invention belongs to the technical field of iron and steel refining, and in particular relates to a device and method for bottom spraying vacuum degassing and refining molten steel. Background technique [0002] The vacuum degassing and refining molten steel method conventionally used in steel refining is a vacuum treatment method formed by combining ladle refining and vacuum degassing technology, often called VD method. The refining method continues to develop, and the VAD method with various refining methods such as arc heating, argon blowing and stirring, vacuum degassing, slagging in the bag, alloying, etc. is derived, and has decarburization, deoxidation, degassing, desulfurization and alloying. Functional VOD method, and some other refining methods with different purposes, such as V-KIP, SS-VOD, K-VOD / VAD, VODC, etc. The VD vacuum refining method has obvious advantages and is widely used in special steel refining by small-scale electric furn...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10C21C7/04C21C7/00
CPCY02P10/143
Inventor 朱苗勇程中福娄文涛
Owner NORTHEASTERN UNIV LIAONING