Patent ID: 6732547
Filing Date: 2004-05-11
Classification: C04B,C21C,C22B,Y02P

Abstract:
A method for preventing the elution of Cr6+ from slag resulting from the refining of stainless steel, which comprises of steps of:adjusting slag in a molten state formed at a step of refining stainless steel such that a resulting molten slag has a basicity in the range of 1.3-4.0, setting a concentration of sulfur in the basicity-adjusted molten slag to be not less than 0.2% by weight by mixing the molten slag with a sulfur-containing material, wherein the sulfur of the sulfur-containing material is zero or minus in valence, and after setting a concentration of sulfur in the molten slag to be not less than 0.2% by weight, cooling the molten slag by quenching at such a speed of cooling that the temperature of the slag is decreased from 1200Â° C. to 400Â° C. within 48 hours, wherein elution of Cr6+ from the slag is prevented.