Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Reexamination Certificate
2005-05-20
2009-10-27
Wyszomierski, George (Department: 1793)
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
C075S450000, C266S172000
Reexamination Certificate
active
07608128
ABSTRACT:
A direct reduction process for a metalliferous material includes supplying a solid carbonaceous material and an oxygen-containing gas into a fluidized bed in a first vessel and generating heat by reactions between the oxygen-containing gas and the solid carbonaceous material and any other oxidizable solids and gases in the fluidized bed and discharging a hot off-gas stream containing entrained solids. The process also includes supplying the metalliferous material to a fluidized bed in a second vessel and supplying the hot off-gas stream containing entrained solids from the first vessel to the fluidized bed in the second vessel and partially reducing the metalliferous feed material in the solid state in the fluidized bed and discharging a product stream of partially reduced metalliferous material and an off-gas stream containing entrained solids.
REFERENCES:
patent: 4806158 (1989-02-01), Hirsch et al.
patent: 5603748 (1997-02-01), Hirsch et al.
patent: 6053961 (2000-04-01), Satchell, Jr.
Bresser W et al: “Circored and Circofer:State of the Art Technology for Low Cost Direct Reduction,” Iron and Steel Engineer, Association of Iron and Steel Engineers, Pittsburgh, U.S, vol. 72, No. 4, Apr. 1, 1995, pp. 81-85.
Dry Rod
Eichberger Heinz
Orth Andreas
Philp Donald Keith
Van Gemund, legal representative Jeantine
McGuthry-Banks Tima M
Outotec Oyj
Smith-Hill & Bedell, P.C.
Wyszomierski George
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