# US 2014/0196571 A1 · Process and device for charging into a smelting unit

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- Number: US 2014/0196571 A1
- Document ID: US20140196571A1
- Status: Published application
- Kind: A1
- Application number: 14/198,697
- Filed: 2014-03-06
- Published: 2014-07-17
- Earliest claimed: 2009-10-16
- Assignees: Siemens Vai Metals Technologies GmbH
- Applicants: Siemens Vai Metals Technologies GmbH
- Inventors: Thomas EDER; Robert MILLNER; Jan FRIEDEMANN PLAUL; Norbert REIN; Andreas SCHERNEY; Karl ZEHETBAUER
- Web page: https://patentgrep.com/patent/US20140196571A1

## CPC

- C21B 3/00: General features in the manufacture of pig-iron (mixers for pig-iron C21C1/06)
- C21B 13/0093: {Protecting against oxidation}
- C21B 13/143: {Injection of partially reduced ore into a molten bath}
- F27D 3/0025: {Charging or loading melting furnaces with material in the solid state}
- C21B 2100/60: Process control or energy utilisation in the manufacture of iron or steel
- Y02P 10/134: by avoiding CO2, e.g. using hydrogen
- C21B: MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B1/00)
- F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## 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.

## Claims

### Claim 1

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 hot state in a reservoir tank; and
supplying the primary product, including the amount stored in the hot state 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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

The process of claim 1, wherein the primary product is hot compacted iron HCI.

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

The process of claim 1, wherein the primary product is hot low reduced iron LRI.

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 8)

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

### Claim 10 (depends on 1)

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