Method for the treatment of slag resulting from the refining...

C - Chemistry – Metallurgy – 04 – B

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C04B 5/06 (2006.01) C21C 5/00 (2006.01) C21C 5/54 (2006.01) C21C 7/00 (2006.01) C21C 7/068 (2006.01) C22B 7/04 (2006.01)

Patent

CA 2331182

A method for treating a stainless steel refining slag which comprises treating a slag generated in a refining process for stainless steel so as for the slag to have a basicity of 1.3 to 4.0 and then mixing the slag in molten state with a substance containing a sulfur having a valency of zero or a negative value in an amount such that the slag has a sulfur content of 0.2 wt % or more. The method can be used for modifying the above slag so that Cr6+ does not elute from the plug substantially perfectly, which results in the effective use of the slag as a material of a pavement base which is free from the danger of environmental pollution. It is preferred for efficient modification that the cooling of the slag mixed with the sulfur-containing substance from 1200 ~C to 400 ~C is carried out rapidly, i.e, within a time of 48 hrs.

Cette invention concerne un procédé de traitement de scories d'affinage d'acier inoxydable, qui consiste à traiter les scories produites au cours de l'affinage d'acier inoxydable de sorte qu'elles aient une alcalinité comprise entre 1,3 et 4,0, puis à les mélanger en état de fusion à une substance renfermant du soufre de valence nulle ou négative en quantité telle que lesdites scories aient une teneur en soufre de 0,2 % ou plus. Ce procédé peut servir à modifier les scories susmentionnées de manière à ce que Cr?6+¿ n'élue pratiquement pas de la colonne, ce qui permet d'utiliser ces scories comme base pour revêtement de chaussée ne présentant pas de danger pour l'environnement. Pour que la modification soit efficace, il est préférable que le refroidissement de 1200 ·C à 400 ·C - des scories mélangées à la substance renfermant du soufre s'effectue rapidement, soit en l'espace de 48 heures.

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