A method for removing slag from molten steel

A technology of slag removal and molten steel, applied in the direction of improving process efficiency, etc., can solve the problems of reducing the internal quality of steel, increasing labor intensity, time-consuming and labor-intensive, etc.

Inactive Publication Date: 2011-12-28
ANGANG STEEL CO LTD
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the extremely high temperature of molten steel, generally above 1600°C, the steel slag in the molten steel tank is in a molten state, and the molten steel slag has excellent fluidity, and it is difficul

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Adopt 250t converter and 250t molten steel tank. When the converter is tapping, the upper part of the molten steel tank is controlled to have a clearance of 310mm. Then, proceed as follows:

[0016] 1. After the molten steel tank reaches the slag removal station and tilts to the slag removal angle, first remove the solidified slag shell on the surface of the molten steel tank.

[0017] 2. After removing the slag shell, there is still 3 tons of steel slag in the molten steel tank. According to the ratio of 1:3 of the addition of lime particles to the slag amount in the molten steel tank, add 1000kg of lime particles with a particle diameter of 5mm in the molten steel tank. Spread the lime evenly with a slag rake.

[0018] 3. After the lime and steel slag fully react, use a slag rake to scrape out the remaining steel slag and lime in the molten steel tank.

Embodiment 2

[0020] Adopt 250t converter and 250t molten steel tank. When the converter is tapping, the upper part of the molten steel tank is controlled to have a clearance of 330mm. Then, proceed as follows:

[0021] 1. After the molten steel tank reaches the slag removal station and tilts to the slag removal angle, first remove the solidified slag shell on the surface of the molten steel tank.

[0022] 2. After removing the slag shell, there is still 3 tons of steel slag in the molten steel tank. According to the ratio of the amount of lime added to the amount of slag in the molten steel tank of 1:6, add 500kg of lime particles with a particle diameter of 25mm into the molten steel tank. A slag rake spreads the lime evenly.

[0023] 3. After the lime and steel slag fully react, use a slag rake to scrape out the remaining steel slag and lime in the molten steel tank.

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
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for removing slag from molten steel, which controls the upper clearance of the molten steel tank to be greater than 300 mm when tapping the converter. When the molten steel tank is tilted to the angle of slag removal, first remove the solidified slag shell; then add lime particles into the molten steel tank according to the ratio of lime and slag of 1:3 to 6 and spread evenly; after the lime and steel slag fully react , Scrape out the residual steel slag in the molten steel tank. Due to the chemical reaction between the lime and the high-temperature molten steel, the steel slag is foamed and the volume of the steel slag is increased, and the steel slag can be discharged from the molten steel tank when it is overturned. And in the process of lime melting and reaction, the temperature of the surface layer of steel slag will decrease, which will increase the viscosity of steel slag and make the steel slag easy to remove, thereby reducing the pollution of molten steel by strong oxidizing steel slag on the surface of molten steel, improving the purity of molten steel, and reducing the amount of deoxidizer. consumption and cost expenditure, reduce the workload of deoxidation treatment, increase the speed of slag removal, and reduce labor intensity.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a method for removing steel slag from the surface of molten steel in a molten steel tank. Background technique [0002] During the tapping process of the converter, there will be a certain eddy current in the series of processes from the beginning of tapping to the end of tapping, which will inevitably bring the steel slag in the converter into the molten steel tank, so the converter slag It has also become the main source of inclusions in molten steel. This kind of steel slag has strong oxidizing property, and it is very easy to cause pollution to molten steel. In order to prevent molten steel from being polluted, the steel slag must be deoxidized, which increases the consumption of deoxidizer and increases the production cost. Simultaneously, in order to reduce inclusions in molten steel and improve the purity of molten steel, almost all steelmaking ...

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
IPC IPC(8): C21C7/00
CPCY02P10/20
Inventor 毛志勇吴世龙王鹏郭猛孙艳霞孟宪娟
Owner ANGANG STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap