Method of introducing a metalliferous feed in an ironmaking process

Patent metadata

Field	Value
Publication number	US-2022316017-A1
Application number	US-202017641464-A
Country	US
Kind code	A1
Filing date	Sep 10, 2020
Priority date	Sep 12, 2019
Publication date	Oct 6, 2022
Grant date	—

Abstract

A method of introducing a metalliferous feed in an ironmaking process, the method including the steps of, pre-drying an iron containing sludge by drying means to an amount of 15 to 30% (w/w) moisture, mixing the pre-dried iron containing sludge with a binder material to obtain a granulate, having a particle size of less than 4 millimeter and drying the granulate to a maximum of 3% (w/w) moisture, thereby forming the metalliferous feed, wherein the metalliferous feed is subsequently injected into a cyclone part of a metallurgical vessel.

First claim

1 . A method of introducing a metalliferous feed in an ironmaking process, the method comprising the steps of, pre-drying an iron containing sludge by drying means to an amount of 15 to 30% (w/w) moisture, mixing the pre-dried iron containing sludge with an organic binder material to obtain a granulate, having a particle size of less than 4 millimeter and drying the granulate to a maximum of 3% (w/w) moisture, thereby forming the metalliferous feed, wherein the metalliferous feed is subsequently injected into a cyclone part of a metallurgical vessel by means of a pneumatic transport system.

2 . The method according to claim 1 , wherein the metallurgical vessel is a smelt reduction vessel.

3 . The method according to claim 1 , wherein the iron containing sludge is pre-dried by drying means to an amount of 20 to 25% (w/w) moisture.

4 . The method according to claim 1 , wherein the binder material is a cellulose derivative.

5 . The method according to claim 1 , wherein the binder material is added in an amount of 0.2% to 0.4% (w/w).

6 . The method according to claim 1 , wherein the particle size of the obtained granulate is less than 3 millimeter.

7 . The method according to claim 1 , wherein the moisture content of the dried granulate is maximum 2% (w/w).

8 . The method according to claim 1 , wherein the granulate is dried by means of a belt drier.

9 . A metalliferous feed for an ironmaking process suitable for pneumatic transport, wherein the metalliferous feed comprises iron containing sludge, and further having a particle size of less than 4 millimeter, an organic binder material content between 0.2 and 0.4% (w/w) and a moisture content with a maximum of 3% (w/w), and in that the metalliferous feed is pneumatically transportable.

10 . The metalliferous feed for an ironmaking process according to claim 9 , wherein the metalliferous feed comprises carbon and/or lime stone.

11 . The metalliferous feed for an ironmaking process according to claim 9 , wherein the binder material is a cellulose derivative.

12 . The metalliferous feed for an ironmaking process according to claim 9 , wherein the particle size is less than 3 millimeter.

13 . A method of producing a metalliferous feed for an ironmaking process suitable for pneumatic transport, wherein the method comprises the steps of pre-drying an iron containing sludge by drying means to an amount of 15 to 30% (w/w) moisture, mixing the pre-dried iron containing sludge with an organic binder material to obtain a granulate, having a particle size of less than 4 millimeter and drying the granulate to a maximum of 3% (w/w) moisture, thereby forming the metalliferous feed, and in that the metalliferous feed is pneumatically transportable.

14 . The method of producing a metalliferous feed for an ironmaking process according to claim 13 , wherein the iron containing sludge is pre-dried by drying means to an amount of 20 to 25% (w/w) moisture.

15 . (canceled)

Assignees

• Tata Steel Ijmuiden Bv

Inventors

• Hage Johannes Leendert Teunis
• Ho Hai Thong
• Blaffart Frederic Adrien
• Wang Xuan

Classifications

• C21B13/008

  Use of special additives or fluxing agents · CPC title

• C21B13/0013 Primary

  introduction of iron oxide into a bath of molten iron containing a carbon reductant · CPC title

• C21B13/14

  Multi-stage processes {processes carried out in different vessels or furnaces} · CPC title

• C21B13/0086 Primary

  Conditioning, transformation of reduced iron ores · CPC title

• C22B1/245

  with carbonaceous material for the production of coked agglomerates · CPC title