Refining vessel for high-temperature melt

Patent metadata

Field	Value
Publication number	US-11976340-B2
Application number	US-202017601681-A
Country	US
Kind code	B2
Filing date	Mar 24, 2020
Priority date	Apr 5, 2019
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

A refining vessel for high-temperature melt includes a refractory for gas blowing nozzle that includes a central refractory embedded with metal tubules, and an outer refractory circumferentially surrounding the central refractory. The refractory for gas blowing nozzle has a horizontal projection on which a minimum radius of an imaginary circle encompassing all the metal tubules embedded in the central refractory is R (mm), wherein the central refractory has an outline that falls between one circle that is concentric with the imaginary circle and has a radius of R+10 mm, and another circle that is concentric with the imaginary circle and has a radius of R+150 mm. The central refractory is formed of a MgO—C refractory having a carbon content of 30 to 80 mass %, and the outer refractory is formed of a MgO—C refractory having a carbon content of 10 to 25 mass %.

First claim

The invention claimed is:

1. A refining vessel for high-temperature melt comprising a gas blowing nozzle configured from a refractory for gas blowing nozzle with one or more gas-blowing metal tubules embedded in a carbon-containing refractory, the refractory for gas blowing nozzle including a central refractory embedded with the one or more gas-blowing metal tubules, and an outer refractory circumferentially surrounding the central refractory, the refractory for gas blowing nozzle having an operating plane in which a minimum radius of an imaginary circle encompassing all the gas-blowing metal tubules embedded in the central refractory is R (mm), wherein the central refractory has an outline that falls between one circle that is concentric with the imaginary circle and has a radius of R+10 mm, and another circle that is concentric with the imaginary circle and has a radius of R+150 mm,
the central refractory is formed of a MgO—C refractory having a carbon content of 30 to 80 mass %, and the outer refractory is formed of a MgO—C refractory having a carbon content of 10 to 25 mass %,
wherein the outer refractory has an outline that falls between one circle concentric with the imaginary circle and having a radius of R×2, and another circle concentric with the imaginary circle and having a radius of R×8.

2. The refining vessel according to claim 1 , wherein the central refractory has an outline that falls between one circle concentric with the imaginary circle and having a radius of R+40 mm, and another circle concentric with the imaginary circle and having a radius of R+70 mm.

3. The refining vessel according to claim 1 , wherein the central refractory has a circular outline concentric with the imaginary circle.

4. The refining vessel according to claim 1 , wherein the central refractory is formed of a MgO—C refractory having a carbon content of 50 to 70 mass %, and the outer refractory is formed of a MgO—C refractory having a carbon content of 15 to 25 mass %.

5. The refining vessel according to claim 1 , wherein the refining vessel comprises the gas blowing nozzle at a furnace bottom portion.

6. The refining vessel according to claim 2 , wherein the central refractory has a circular outline concentric with the imaginary circle.

7. The refining vessel according to claim 2 , wherein the central refractory is formed of a MgO—C refractory having a carbon content of 50 to 70 mass %, and the outer refractory is formed of a MgO—C refractory having a carbon content of 15 to 25 mass %.

8. The refining vessel according to claim 3 , wherein the central refractory is formed of a MgO—C refractory having a carbon content of 50 to 70 mass %, and the outer refractory is formed of a MgO—C refractory having a carbon content of 15 to 25 mass %.

9. The refining vessel according to claim 2 , wherein the refining vessel comprises the gas blowing nozzle at a furnace bottom portion.

10. The refining vessel according to claim 3 , wherein the refining vessel comprises the gas blowing nozzle at a furnace bottom portion.

11. The refining vessel according to claim 6 , wherein the refining vessel comprises the gas blowing nozzle at a furnace bottom portion.

12. The refining vessel according to claim 7 , wherein the refining vessel comprises the gas blowing nozzle at a furnace bottom portion.

13. The refining vessel according to claim 1 , wherein the central refractory contains less than 3.0 mass % of at least one of metal aluminum, metal silicon, Al—Mg, SiC, and B 4 C.

Assignees

• Jfe Steel Corp

Inventors

• Hosohara Seiji
• Torigoe Atsushi
• Fujiyoshi Ryoma

Classifications

• C21C5/48 Primary

  Bottoms or tuyéres of converters · CPC title

• F27D3/16

  Introducing a fluid jet or current into the charge (F27D3/18 takes precedence) · CPC title

• F27D2003/164

  Oxygen · CPC title

• F27D2003/165

  the fluid being a fuel · CPC title

• F27B3/22

  Arrangements of air or gas supply devices · CPC title