Dephosphorizing flux and method for preparing same

Patent metadata

Field	Value
Publication number	US-11225695-B2
Application number	US-201716468811-A
Country	US
Kind code	B2
Filing date	Dec 11, 2017
Priority date	Dec 12, 2016
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

Provided is a dephosphorizing flux configured to adjust a phosphorous component contained in molten steel, the dephosphorizing flux includes a main material including BaCO3 and a supplementary material, wherein the supplementary material includes a first material containing either of NaHCO3 or Na2CO3 and a second material containing CaF2. Thus, in accordance with a dephosphorizing flux and a method for preparing the same of the present disclosure, the plugging of a lower blowing nozzle that blows a carrier gas during dephosphorization may be prevented while improving a dephosphorization ratio. In addition, since environment polluting substances are not used as in conventional arts, environment pollution risk may be reduced, and the cost burden due to the facility for pollution prevention and harmful substance management may be alleviated.

First claim

What is claimed is:

1. A dephosphorizing flux to adjust a phosphorous component contained in molten steel, the dephosphorizing flux comprising a main material comprising BaCO 3 and a supplementary material,
wherein the supplementary material comprises a first material comprising NaHCO 3 and a second material comprising CaF 2 .

2. The dephosphorizing flux of claim 1 , wherein the first material comprises NaHCO 3 such that a content ratio of CaF 2 wt %/NaHCO 3 wt % of the second material to the first material is greater than 0 and not greater than 2.3.

3. The dephosphorizing flux of claim 2 , wherein the first material comprises NaHCO 3 such that the content ratio (CaF 2 wt%/NaHCO 3 wt%) of the second material to the first material is greater than 0 and not greater than 1.4.

4. The dephosphorizing flux of claim 3 , wherein the first material comprises NaHCO 3 such that the content ratio of CaF 2 wt %/NaHCO 3 wt % of the second material to the first material is 0.5 to 1 inclusive.

5. The dephosphorizing flux of claim 1 , wherein the supplementary material is greater than 0 wt % and not greater than 30 wt % with respect to the total of the dephosphorizing flux.

6. The dephosphorizing flux of claim 5 , wherein the supplementary material is greater than 0 wt % and not greater than 20 wt % with respect to the total of the dephosphorizing flux.

7. The dephosphorizing flux of claim 1 , wherein the second material is at least 2 wt % with respect to the total of the supplementary material.

8. A method for preparing a dephosphorizing flux to adjust a phosphorous component contained in molten steel, the method comprising:
preparing BaCO 3 which is a main material;
preparing a supplementary material comprising a first material comprising NaHCO 3 and a second material comprising CaF 2 ; and
mixing the main material and the supplementary material.

9. The method of claim 8 , wherein in the preparing of the supplementary material, when the first material comprises NaHCO 3 , the content ratio of CaF 2 wt %/NaHCO 3 wt % of the second material to the first material is configured to be greater than 0 and not greater than 2.3.

10. The method of claim 9 , wherein in the preparing of the supplementary material, when the first material comprises NaHCO 3 , the content ratio of CaF 2 wt %/NaHCO 3 wt % of the second material to the first material is configured to be greater than 0 and not greater than 1.4.

11. The method of claim 10 , wherein in the preparing of the supplementary material, when the first material comprises NaHCO 3 , the content ratio of CaF 2 wt %/NaHCO 3 wt % of the second material to the first material is configured to be 0.5 to 1 inclusive.

12. The method of claim 8 , wherein in the mixing of the main material and the supplementary material, the supplementary material is added to be at most approximately 30 wt % with respect to the total of the dephosphorizing flux.

13. The method of claim 12 , wherein in the mixing of the main material and the supplementary material, the supplementary material is added to be at most 20 wt % with respect to the total of the dephosphorizing flux.

14. The method of claim 8 , wherein in the preparing the supplementary material, the second material is added to be at least 2 wt % with respect to the total of the supplementary material.

Assignees

• Posco

Inventors

• Han Woong Hee
• Ahn Chong Tae
• Beak Jun Jeong
• Song Min Ho
• Kang Soo Chang

Classifications

• C21C7/064

  Dephosphorising; Desulfurising · CPC title

• C22C33/04

  by melting · CPC title

• C22C38/04

  containing manganese · CPC title

• C21C7/076

  Use of slags or fluxes as treating agents (C21C7/06, C21C7/064, C21C7/068 take precedence) · CPC title

• C21C7/0645 Primary

  Agents used for dephosphorising or desulfurising · CPC title