Molten metal producing and refining method
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United States of America Patent
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Sep 21, 1993
Grant Date -
N/A
app pub date -
Sep 25, 1991
filing date -
Jun 29, 1990
priority date (Note) -
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Abstract
The disclosure relates to a molten metal producing and refining method which does not damage the apparatus, realizes a stable and high second combustion rate, and is capable of effectively recovering heat generated by the second combustion. The method comprises introducing a metal-containing material, a carbonaceous material, a flux and O.sub.2 gas into a furnace. The carbon which dissolves into the metal bath in the furnace from the carbonaceous material is combusted with the O.sub.2 gas to generate heat and CO gas. The CO gas is subjected to the second combustion with the O.sub.2 gas to additionally generate heat, and the metal-containing material is melted and refined by both the generated heat and carbon. The method is characterized in that O.sub.2 gas or O.sub.2 -containing gas is blown into the furnace through large-diameter tuyeres installed near the bottom of the furnace and a part of the O.sub.2 gas does not combust in the metal bath and leaves the metal bath unburnt, to perform the second combustion of the unburnt O.sub.2 gas with CO gas in the slag bath in the furnace.
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