Title: Method and system for producing metallic iron nuggets

Abstract

Method and system for producing metallic nuggets includes providing reducible mixture of reducing material (such as carbonaceous material) and reducible iron bearing material (such as iron oxide) that may be arranged in discrete portions, such as mounds or briquettes, on at least a portion of a hearth material layer (such as carbonaceous material). A coarse overlayer of carbonaceous material may be provided over at least some of the discrete portions. Heating the reducible mixture to 1425.degree. C. or 1400.degree. C. or 1375.degree. C. results in formation of an intermediate product of one or more metallic iron nuggets, which may have a sulfur content of less than 0.03%, and slag, which may have less than 5% mass MgO, which may have a ratio of percent by weight sulfur in the slag over percent by weight sulfur in the metallic nuggets of at least about 12 or at least about 15.

Inventors:

Iwasaki, Iwao; Lindgren, Andrew J.; Kiesel, Richard F.

Issue Date:

Tue Jun 25 00:00:00 EDT 2013

Research Org.:

Nu-Iron Technology, LLC (Charlotte, NC)

Sponsoring Org.:

USDOE

OSTI Identifier:

1087363

Patent Number(s):

8470068

Application Number:

12/359,729

Assignee:

Nu-Iron Technology, LLC (Charlotte, NC)

Patent Classifications (CPCs):

C - CHEMISTRY C21 - METALLURGY OF IRON C21B - MANUFACTURE OF IRON OR STEEL

C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS

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C - CHEMISTRY C21 - METALLURGY OF IRON C21B - MANUFACTURE OF IRON OR STEEL

C21B13/0046 - {making metallised agglomerates or iron oxide}
C21B13/006 - {Starting from ores containing non ferrous metallic oxides}
C21B13/008 - {Use of special additives or fluxing agents}
C21B13/105 - {Rotary hearth-type furnaces}

C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS

C22B1/245 - with carbonaceous material for the production of coked agglomerates
C22B5/10 - by solid carbonaceous reducing agents

F - MECHANICAL ENGINEERING F27 - FURNACES F27B - FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL

F27B9/028 - {Multi-chamber type furnaces,
F27B9/045 - {Furnaces with controlled atmosphere}
F27B9/12 - with special arrangements for preheating or cooling the charge
F27B9/20 - the charge moving in a substantially straight path {tunnel furnace}
F27B9/40 - Arrangements of controlling or monitoring devices

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DOE Contract Number:  

FG36-05GO15185

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE