Method of desulphurizing pig-iron
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United States of America Patent
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Sep 11, 1990
Grant Date -
N/A
app pub date -
Apr 12, 1989
filing date -
Apr 14, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The method concerns the desulphurization of cast iron produced by a blast furnace, before it is converted to steel. In a first phase of the process the cast iron is treated with a desulphurizing compound such as Na.sub.2 CO.sub.3. A very long composite product with a tubular skin is then added to the cast iron. The product comprises an axial zone containing magnesium in powdered or granular form, and an annular zone, separated from the axial zone by an intermediate wall and containing a powdered or granular material. An inert gas could then be injected and a clearing operation carried out.
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