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March
2005 |
Iron and Steam
John Stubbles, steel
industry consultant, Mason, Ohio
The
impact of the steam engine on human productivity and mobility
has been staggering. The unrecognized but critical role played
by ironmakers in its development is addressed in this article. |
Taphole
Maintenance Improvements at Dofasco
Cameron Bell, electrical
coordinator — coke and iron technology, Brian D. Boettcher,
operations specialist — ironmaking operations (left),
Frank Hribljan, millwright and fluid power technician —
iron mechanical, Brian M. Kinsman, process specialist —
coke and iron technology (center), and Floris R. van Laar,
refractory specialist — engineering and maintenance
technology (right), Dofasco Inc., Hamilton, Ont., Canada (brian_kinsman@dofasco.ca)
Changes
in taphole design were implemented during the 1998 reline
of Dofasco’s No. 4 blast furnace. This article reviews
the impact of those changes on taphole maintenance, equipment
and operating practices, measurement systems and overall blast
furnace
performance. |
Mesabi
Nugget – The New Age of Iron
Jeffrey A. Hansen,
technical advisor, Mesabi Nugget LLC, Silver Bay, Minn., and
supervisor, Iron Dynamics Inc. (jhansen@cci-northshore.com)
The
ITmk3® process is a new ironmaking technology that brings
about reduction, melting and slag removal in about 10 minutes.
This article describes how Mesabi Nugget LLC has been preparing
the process for
commercialization so that a high-quality iron product can
be produced at substantially lower costs. |
Influence
of Coke Properties and Reactivity on Coke Fines in a
Blast Furnace
Sushil Kumar Gupta
(pictured), Veena Sahajwalla and N. Saha-Chaudhury, School
of Materials Science and Engineering, The University of New
South Wales, Sydney, Australia; John Burgo, U. S. Steel Corp.
Monroeville, Pa.; Pinakin Chaubal, Ispat Inland Inc., East
Chicago, Ind.; and Ted Youmans, International Steel Group
Inc., Sparrows Point, Md. (sushil@materials.unsw.edu.au)
Increasing
fuel injection rates is critical to improving economic and
environmental efficiency of blast furnace ironmaking. This
article investigates the relationship among coke graphitization,
reactivity and fines generation and how the operation of a
blast furnace can be made more efficient. |
Heat
Recovery for Hot Blast Stoves
Tom Cellissen, process
technologist (pictured), and Edwin van den Haak, Danieli Corus
BV, Velsen–Noord, The Netherlands (tom.cellissen@corusgroup.com,
edwin.van-den-haak@corusgroup.com)
This
article describes how a waste gas heat recovery system installed
at integrated steel plants can lead to both energy and enrichment
gas savings. The use of enrichment gas can be fully eliminated
by using an additional blast furnace gas burner. |
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