Method for the treating stainless steel refining slag
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United States of America Patent
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May 11, 2004
Grant Date -
N/A
app pub date -
Nov 9, 2000
filing date -
Mar 10, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The slag in a molten state formed at a step of refining stainless steel is adjusted such that the slag has a basicity in the range of 1.3-4.0, and the slag is mixed with a sulfur-containing material wherein the sulfur is zero or minus in valence, thereby setting the concentration of sulfur in the slag to be not less than 0.2% by weight. The slag is so modified that Cr.sup.6+ is substantially completely prevented from being eluted and can be effectively utilized as a roadbed material and a reclamation material for civil works. The slag is quenched at such a speed of cooling that the temperature of the slag is decreased from 1200.degree. C. to 400.degree. C. within 48 hours so that noticeable effects are attained.
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