Direct reduction process using a single fluidised bed

Details Direct reduction process using a single fluidised bed Direct reduction process using a single fluidised bed

2005-05-20

2011-10-18

Lorengo, Jerry A (Department: 1731)

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

C075S433000, C075S443000, C075S444000, C075S447000, C075S451000, C075S452000, C423S138000, C423S148000

Reexamination Certificate

active

08038766

ABSTRACT:
A direct reduction process for a metalliferous material includes supplying the metalliferous material, a solid carbonaceous material, an oxygen-containing gas, and a fluidizing gas into a fluidized bed in a vessel and maintaining the fluidized bed in the vessel, at least partially reducing metalliferous material in the vessel, and discharging a product stream that includes the partially reduced metalliferous material from the vessel. The process comprises (a) reducing the metalliferous material in a solid state in a metal-rich zone in the vessel; (b) injecting the oxygen-containing gas into a carbon-rich zone in the vessel with a downward flow in a range of ±40° to the vertical and generating heat by reactions between oxygen and the metalliferous material (including metallized material), the solid carbonaceous material and other oxidizable solids and gases in the fluidized bed, and (c) transferring heat from the carbon-rich zone to the metal-rich zone by movement of solids within the vessel. The metal-rich zone is formed in a lower section of the vessel and the carbon-rich zone is an intermediate section below an upper section of the vessel. Oxygen-containing gas is injected into a central region of the vessel.

REFERENCES:
patent: 3753685 (1973-08-01), Tajima et al.
patent: 4084958 (1978-04-01), Collin et al.
patent: 4359212 (1982-11-01), Bengtsson et al.
patent: 4374663 (1983-02-01), Collin et al.
patent: 4930757 (1990-06-01), Manwell et al.
patent: 5433767 (1995-07-01), Bresser et al.
patent: 5445667 (1995-08-01), Malmstroem et al.
patent: 5542963 (1996-08-01), Sherwood
patent: 5560762 (1996-10-01), Bresser et al.
patent: 5810905 (1998-09-01), Shultz
patent: 6446565 (2002-09-01), Stricker et al.
patent: 0617136 (1994-09-01), None
patent: 10280021 (1998-10-01), None
Patience et al., Advances in Engineering Fluid Mechanics, 1996, Gulf Professional Publishing, p. 262 and 278-9.
Van Der Berg et al., Fluidized-bed reduction of fine iron ore by the in-situ combustion of coal, Apr. 1989, Journal of South African Institute of Mining and Metallurgy, vol. 89, No. 4, p. 89-98.
Weber et al., Circofer: A Low Cost Approach to DRI Production, Sep. 1, 1994, Iron and Steel Engineer, vol. 71, iss. 9.
Srinivasan, Reduction of iron oxides by carbon in a circulating fluidized bed reactor, 2002, Powder Technology, vol. 124, p. 28-39.

Affiliated with

Also associated with

Rating

Direct reduction process using a single fluidised bed does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Direct reduction process using a single fluidised bed, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct reduction process using a single fluidised bed will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4263972