Agent for desulfurization, dephosphorization, desiliconizing and denitriding of pig iron, cast iron and chromium and manganese containing melts and process for the treatment thereof
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United States of America Patent
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Jan 31, 1995
Grant Date -
N/A
app pub date -
Dec 14, 1993
filing date -
Dec 15, 1992
priority date (Note) -
Expired
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Abstract
An agent for desulfurization, dephosphorization, desiliconizing, and denitriding of ironmelt and melt containing chromium or manganese, consisting of at least one of the following mineral raw-material: alkali-containing plagioclase (feldspar), alkali-containing orthoclase, montmorillonite (perlite), bentonite, muscovite, or zeolithe, and calcium carbide and/or calcium oxide. These mixtures can be blended further with scale, Fe-ores, Cr-ores or Mn-ores and used by standard technologies. The mineralic components, in connection with calcium carbide, lime, iron-ore or scale or other related ores, cause an effective reduction of unwanted elements, such as sulfur, phosphorus, silicium, and nitrogen, in the metal melts. The slags produced are freely skimmed and contain less iron granules than standard agents. Some of these materials may be enriched with alkali oxides by sintering or melting with appropriate compounds, like soda ash. This invention also involves a process for the treatment of iron-, ferrochromium and ferromanganese melts, wherein the components of the agent are fed either pre-mixed or separately into the melt.
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