Method for re-utilizing scrap steels
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United States of America Patent
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Dec 28, 1999
Grant Date -
N/A
app pub date -
Dec 19, 1997
filing date -
Dec 20, 1996
priority date (Note) -
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Abstract
A methods for re-utilizing, for example, scrap steels are provided. A method is provided for separating Sn-containing oxides from steel by blowing Sn-containing oxides away from a steel using a gas. Also provided is a method of making a reclaimed steel by (a) heating a coated steel having an Sn-containing surface layer to oxidize at least a portion of the surface layer; (b) separating at least a portion of the surface layer from the coated steel to produce Sn-containing oxides and an uncoated steel; (c) blowing the Sn-containing oxides away from the uncoated steel using an exhaust gas, where steps (a), (b), and (c) are conducted in a first reaction zone; (d) melting the steel in a second reaction zone to produce the reclaimed steel and an exhaust gas; and (e) recycling at least a portion of the exhaust gas produced in the second reaction zone to the first reaction zone for use in the blowing step, where steps (a), (b), (c), (d), and (e) are conducted simultaneously.
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