METHOD FOR TREATING STAINLESS STEEL REFINING SLAG

摘要

The present invention provides a method for the treatment of slag resulting from the refining of stainless steel, which comprises adjusting slag in a molten state formed at a step of refining stainless steel such that the slag has a basicity in the range of 1.3 - 4.0, and mixing the slag 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. According to the invention, the slag is so modified that Cr<6+> is substantially completely prevented from being eluted and can be effectively utilized as a roadbed material and a reclamation material for civil works. In particular, in this method, the slag is quenched at such a speed of cooling that the temperature of the slag is decreased from 1200 DEG C to 400 DEG C within 48 hours so that noticeable effects are attained.