Process and device for charging into a smelting unit

Patent metadata

Field	Value
Publication number	US-9365906-B2
Application number	US-201414198697-A
Country	US
Kind code	B2
Filing date	Mar 6, 2014
Priority date	Oct 16, 2009
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A process and a device for charging a primary product for pig iron into a smelting unit are provided. According to the process and device, some of the primary product that has been formed by reducing oxidic iron carriers is stored in the hot state in a reservoir tank before being supplied into the storage device or charging device that is directly connected to the smelting unit.

First claim

What is claimed is:

1. A process for producing pig iron in a smelting unit, comprising:
producing a primary product by reducing oxidic iron carriers using a first reducing gas and compacting the reduced iron carriers;
transferring, without quenching, to a reservoir tank an amount of the primary product after compacting;
storing the amount of the primary product in the reservoir tank after the compacting; and
supplying the primary product, including the amount stored in the reservoir tank, to a storage device which is directly connected to the smelting unit; and
adding the primary product from the storage device or charging device into the smelting unit.

2. The process of claim 1 , wherein the oxidic iron carriers are particulate iron ore.

3. The process of claim 1 , wherein the oxidic iron carriers are lump ore or pellets.

4. The process of claim 1 , wherein the primary product is hot compacted iron (HCl).

5. The process of claim 1 , wherein the primary product is hot briquetted iron (HBI).

6. The process of claim 1 , wherein the primary product is partially reduced iron LRI.

7. The process of claim 1 , further comprising flushing a reoxidation protective gas which inhibits reoxidation of the primary product around the primary product stored in the hot state in the reservoir tank.

8. The process of claim 1 , wherein a second reducing gas flows through the storage device which is directly connected to the smelting unit.

9. The process as claimed in claim 8 , wherein the first reducing gas and the second reducing gas originate from the same source.

10. The process of claim 1 , wherein the addition from the storage device into the smelting unit takes place substantially according to the force of gravity.

11. A process for producing pig iron in a smelting unit from a primary product which has been obtained by reducing oxidic iron carriers using a first reducing gas, comprising:
storing an amount of the primary product in a reservoir tank; and
supplying the primary product, including the amount stored in the reservoir tank, to a storage device or charging device which is directly connected to the smelting unit; and
adding the primary product from the storage device or charging device into the smelting unit,
wherein a second reducing gas flows through the storage device or charging device which is directly connected to the smelting unit.

12. The process as claimed in claim 11 , wherein the first reducing gas and the second reducing gas originate from the same source.

Assignees

• Siemens Vai Metals Tech Gmbh
• Primetals Technologies Austria GmbH

Inventors

• Eder Thomas
• Millner Robert
• Friedemann Plaul Jan
• Rein Norbert
• Scherney Andreas
• Zehetbauer Karl

Classifications

• C21B13/0093 Primary

  Protecting against oxidation · CPC title

• F27D3/0025 Primary

  Charging or loading melting furnaces with material in the solid state · CPC title

• C21B3/00 Primary

  General features in the manufacture of pig-iron (mixers for pig-iron C21C1/06) · CPC title

• C21B13/143

  Injection of partially reduced ore into a molten bath · CPC title

• C21B2100/20

  Increasing the gas reduction potential of recycled exhaust gases · CPC title