Method for reclaiming residue steel and slag of molten steel container

A recycling method and ladle technology, applied in the field of metallurgy, can solve problems such as waste of iron resources, inability to recycle surplus steel and slag, and difficult disposal, and achieve the effects of saving raw materials and energy, improving labor intensity, and improving purity

Inactive Publication Date: 2006-06-21
SHAGANG GROUP
View PDF0 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the steel slag is separated, generally there are still a large amount of residual steel remaining in the slag. These residual steel particles not only affect the utilization of the slag as a building material, but also waste a large amount of iron resources; at the same time, because the slag of the ladle refining furnace has Reduction, which contains a large amount of free calcium oxide, which will naturally expand in the slag tank and waste slag yard, making the original blocky slag pulverized. Therefore, it is easy to cause environmental pollution in the waste slag transportation, stacking process, or steel slag treatment process, and oxidation Compared with permanent steel slag, it is more difficult to deal with, and the secondary and tertiary pollution is serious
In the existing steelmaking technology, because the remaining steel and slag cannot be fully and effectively recycled, this not only causes a lot of waste of energy and resources in the steelmaking process, but also causes certain pollution to the environment

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
  • Method for reclaiming residue steel and slag of molten steel container
  • Method for reclaiming residue steel and slag of molten steel container
  • Method for reclaiming residue steel and slag of molten steel container

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 As shown, a method for recovering residual steel and slag from a steelmaking ladle. During steelmaking, when the ladle 1 is tapped, it is immediately moved to the ladle 6 where the molten iron 5 is stored, and then the ladle cover 2 is removed. , then tip over the ladle 1, and pour the liquid residue 3 and the remaining steel 4 in the ladle 1 into the ladle 6 together. Because the temperature of molten iron 5 in ladle 6 is low, and the remaining steel 4 fusing point without mixing is higher, therefore, will form one deck solidification shell 8 on the liquid surface of molten iron 5 of ladle 6, thereby has affected newly added The remaining steel 4 and the remaining slag 3 are mixed with the original molten iron 5 and the molten iron slag 7 in the ladle 6.

[0021] In this embodiment, in order to fully mix the newly added remaining steel 4 and remaining slag 3 with the original molten iron 5 and molten iron slag 7 in the ladle 6, electromagnetic stirrin...

Embodiment 2

[0024] The present invention also can adopt the mechanical stirring method of ladle, when steel ladle 1 is tapped out, and after the liquid residue 3 in ladle 1 and remaining steel 4 are poured into ladle 6 together, adopt mechanical stirring device to stir again, Fully mix the newly added residual steel 4 and residual slag 3 with the original molten iron 5 and molten iron slag 7 in the ladle 6 . Such as Figure 5 As shown, a mechanical stirring device 10 immerses a stirring paddle 11 made of refractory material into the molten iron 5 of a certain depth in the ladle 6 from the upper part of the ladle 6 to stir the molten iron to make the molten iron rotate. Under the action of the stirring blade 11, the molten iron is well stirred and fully mixed, and the solidified shell 8 on the liquid surface of the original molten iron 5 dissolves and disappears rapidly due to the lowering of the melting point.

[0025] Certainly, in the present embodiment, also can adopt the method that ...

Embodiment 3

[0027] In the reclaiming method of remaining steel and residual slag in steelmaking ladle described in the invention, also can adopt the method that ladle electromagnetic stirring and mechanical stirring combine, as Figure 7 As shown, the lower part of the ladle 6 is provided with an electromagnetic stirring device 9, and the upper part is provided with a mechanical stirring device 10, so as to strengthen the stirring and mixing of the molten iron 5 and the slag. Before the stirring paddle 11 is inserted into the molten iron 5 for stirring, the electromagnetic stirring device 9 is used to stir to weaken the solidification shell 8 on the liquid level of the molten iron 5 , and then the mechanical stirring device 10 is used to strengthen the mixing of the molten iron 5 and the molten iron slag 7 .

[0028] In addition, in the present invention, the method of blowing oxygen to the liquid surface of the molten iron 5 in the molten iron ladle 6 can also be adopted to quickly elimin...

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

No PUM Login to view more

Abstract

The invention discloses the recovery method of waste steel and residue, comprising the following steps: after tapping the ladle, decanting the waste steel and residue into foundry ladle, mixing them with the iron melt which is already in the foundry ladle, stirring, and then entering the mixture into the electric-arc steel furnace or converter. The advantages of the method are following: saving the raw material and energy resource and eliminating the pollution; improving the manufacturing environment of workplace and depressing the intensity of labor; increasing the purity of continuous casting molten steel.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a method for making steel by using surplus steel and waste slag in a steelmaking ladle, and also relates to a recycling method for surplus steel and slag in a steelmaking ladle. Background technique [0002] Ladle refining outside the furnace is a commonly used steelmaking technology. In order to deoxidize and desulfurize molten steel, a large amount of high-basicity slag must be used, and the amount of slag is generally greater than 15 kg / ton of steel. The calcium oxide in the slag (hereinafter Also referred to as "CaO") content is generally greater than 45%. Of course, ladle slag also contains other compounds, such as magnesium oxide (MgO), aluminum oxide (Al 2 o 3 ), silicon oxide (SiO 2 ) and a small amount of iron oxide (FeO) and manganese oxide (MnO), etc. In order to improve the quality of continuous casting slabs, in the continuous casting process of steelmaking, it ...

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 Applications(China)
IPC IPC(8): C21B3/06
CPCY02P10/20Y02W30/50
Inventor 刘俭张晓兵
Owner SHAGANG GROUP
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