Specialized metallurgical processes – compositions for use therei – Processes – Process control responsive to sensed condition
Reexamination Certificate
2005-11-01
2005-11-01
Andrews, Melvyn (Department: 1742)
Specialized metallurgical processes, compositions for use therei
Processes
Process control responsive to sensed condition
C075S384000, C266S081000, C266S087000
Reexamination Certificate
active
06960238
ABSTRACT:
In a process for the gas reduction of particulate oxide-containing ores, in particular iron-oxide-containing material, in the fluidized-bed process at a pressure of <5 bars, wherein the ore by aid of a reducing gas produced from coal is heated, optionally also pre-reduced, in a fluidized-bed reactor (1) designed as a pre-heating stage (5), subsequently is reduced to sponge iron in at least one fluidized-bed reactor (2, 3) designed as a reduction stage (7, 8), the reducing gas via a reducing-gas feed duct (12) or reducing-gas duct (13) being conducted from the reduction stage (7, 8) to the pre-heating stage (5) in the opposite direction of the material to be reduced and conducted from stage to stage, and being drawn off as an export gas after purification, heat is supplied to the reducing gas fed to the reduction stage (7, 8) and/or pre-heating stage (5), namely by combustion, together with oxygen and/or air, of a portion of the reducing gas provided for the gas reduction in the reduction stage (7, 8) and/or the pre-heating stage (5).
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International Search Report, Dec. 27, 2002.
Hauzenberger Franz
Joo Sang-hoon
Kepplinger Leopold Werner
Schenk Johannes
Andrews Melvyn
Ostrolenk Faber Gerb & Soffen, LLP
Voest-Alpine Industrieanlagenbau GmbH & Co.
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