Method for manufacturing sintered ore

Patent metadata

Field	Value
Publication number	US-10995388-B2
Application number	US-201816490240-A
Country	US
Kind code	B2
Filing date	Apr 20, 2018
Priority date	Apr 27, 2017
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

Uneven sintering is prevented in a sintering machine, and thus sintered ore having high strength and a high lump yield rate is manufactured. A method for manufacturing sintered ore comprising: charging sintering raw material comprising fine ore and carbon material on a circulatively moving pallet to form a raw material layer; igniting the carbon material on a surface of the raw material layer and sucking air from above the raw material layer down to below the palette so that the air is introduced into the raw material layer; and combusting the carbon material in the raw material layer to thereby manufacture sintered ore, wherein fuel gas is discharged from a nozzle at a flow speed of 40 m/s or more, the discharged fuel gas is combusted to generate combustion gas, and the combustion gas is used for igniting the carbon material.

First claim

The invention claimed is:

1. A method for manufacturing sintered ore comprising:
charging sintering raw material comprising fine ore and carbon material on a circulatively moving pallet to form a raw material layer;
igniting the carbon material on a surface of the raw material layer and sucking air from above the raw material layer down to below the palette so that the air is introduced into the raw material layer; and
combusting the carbon material in the raw material layer to thereby manufacture sintered ore, wherein
fuel gas is discharged from a nozzle at a flow speed of 40 m/s or more,
the discharged fuel gas is combusted to generate combustion gas, and
the combustion gas hits against a surface of the raw material layer for igniting the carbon material.

2. The method for manufacturing sintered ore according to claim 1 , wherein
the combustion gas is generated using a burner comprising:
a main burner part having a fuel gas nozzle configured to discharge the fuel gas and an air nozzle configured to discharge air for combustion; and
a sub burner part positioned further outward than the main burner part and configured to combust the fuel gas discharged from the main burner part.

3. The method for manufacturing sintered ore according to claim 2 , wherein
the burner has an end towards which a flame is formed;
the end has a recessed part; and
the recessed part has a bottom part and a tapered part wherein the tapered part gradually widens from the bottom part towards the end of the burner.

4. The method for manufacturing sintered ore according to claim 3 , wherein
the bottom part and the tapered part, which form the recessed part, make an angle θ of 20° or more.

5. The method for manufacturing sintered ore according to claim 1 , wherein
the flow speed of the fuel gas is 50 m/s or more and 150 m/s or less.

6. The method for manufacturing sintered ore according to claim 2 , wherein
the flow speed of the fuel gas is 50 m/s or more and 150 m/s or less.

7. The method for manufacturing sintered ore according to claim 3 , wherein
the flow speed of the fuel gas is 50 m/s or more and 150 m/s or less.

8. The method for manufacturing sintered ore according to claim 4 , wherein
the flow speed of the fuel gas is 50 m/s or more and 150 m/s or less.

Assignees

• Jfe Steel Corp

Inventors

• Kuroiwa Masato
• Nonaka Shunsuke
• HORIKAWA Yukimasa
• OURA Shunsuke
• Jinno Tetsuya

Classifications

• C22B1/20 Primary

  in sintering machines with movable grates · CPC title

• C22B1/18

  in sinter pots · CPC title

• C22B1/16 Primary

  Sintering; Agglomerating · CPC title

• C22B1/205

  regulation of the sintering process · CPC title