Gas injection nozzle refractory and gas injection nozzle

Patent metadata

Field	Value
Publication number	US-11821691-B2
Application number	US-201917277149-A
Country	US
Kind code	B2
Filing date	Sep 19, 2019
Priority date	Sep 21, 2018
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

A gas injection nozzle refractory with one or more gas injection small metal tubes buried therein has improved durability. The gas injection nozzle refractory includes a MgO—C central refractory with a small metal tube buried therein, and a MgO—C peripheral refractory surrounding the central refractory. The central refractory on a plane of the gas injection nozzle refractory has an external shape of a circle with a radius in the range of R+10 to R+150 mm concentric with a virtual circle with a minimum radius surrounding all buried small metal tubes, R mm being a radius of the virtual circle.

First claim

The invention claimed is:

1. A gas injection nozzle refractory with at least one gas injection small metal tube buried in a carbon-containing refractory, the gas injection nozzle refractory comprising:
a central refractory with the at least one small metal tube buried therein, the central refractory being a MgO—C refractory with a carbon content in the range of 40% to 80% by mass, a metal Al content in the range of 3% to 8% by mass, and a mass ratio of a metal Si content to the metal Al content in the range of 0.30 to 1.0, and
a peripheral refractory surrounding the central refractory, the peripheral refractory being a MgO—C refractory with a carbon content in the range of 10% to 25% by mass,
wherein the central refractory on a plane of the gas injection nozzle refractory has an external shape of a circle with a radius in the range of R+10 to R+150 mm concentric with a virtual circle with a minimum radius surrounding the at least one buried small metal tube, R mm being a radius of the virtual circle.

2. The gas injection nozzle refractory according to claim 1 , wherein the external shape is a circle with a radius in the range of R+40 to R+70 mm concentric with the virtual circle.

3. The gas injection nozzle refractory according to claim 1 , wherein the metal Al content is in the range of 5% to 7% by mass.

4. The gas injection nozzle refractory according to claim 1 , wherein the metal Al content is in the range of 5% to 7% by mass, and the mass ratio of the metal Si content to the metal Al content is in the range of 0.30 to 0.45.

5. A gas injection nozzle comprising:
a working surface; and
a refractory microstructure including the gas injection nozzle refractory according to claim 1 .

6. The gas injection nozzle refractory according to claim 2 , wherein the metal Al content is in the range of 5% to 7% by mass.

7. The gas injection nozzle refractory according to claim 2 , wherein the metal Al content is in the range of 5% to 7% by mass, and the mass ratio of the metal Si content to the metal Al content is in the range of 0.30 to 0.45.

8. A gas injection nozzle comprising:
a working surface; and
a refractory microstructure including the gas injection nozzle refractory according to claim 3 .

9. A gas injection nozzle comprising:
a working surface; and
a refractory microstructure including the gas injection nozzle refractory according to claim 4 .

10. A gas injection nozzle comprising:
a working surface; and
a refractory microstructure including the gas injection nozzle refractory according to claim 6 .

11. A gas injection nozzle comprising:
a working surface; and
a refractory microstructure including the gas injection nozzle refractory according to claim 7 .

12. The gas injection nozzle refractory according to claim 1 , wherein the carbon content of the MgO—C refractory of the central refractory is in the range of 50% to 80% by mass.

Assignees

• Jfe Steel Corp
• Shinagawa Refractories Co

Inventors

• Hosohara Seiji
• Iida Atsuhisa
• Torigoe Atsushi
• Fujiyoshi Ryoma

Classifications

• F27D3/16 Primary

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

• C21C5/34 Primary

  Blowing through the bath (C21C5/35 takes precedence) · CPC title

• C21C5/48

  Bottoms or tuyéres of converters · CPC title

• F27D2003/161

  through a porous element · CPC title

• F27D2003/169

  Construction of the lance, e.g. lances for injecting particles · CPC title