Patent ID: 6638204
Filing Date: 2003-10-28
Classification: A62D

Abstract:
A method for treating heavy metal-containing waste, which consists essentially of:melting and kneading (A) heavy metal-containing waste, (B) an alkali metal or an alkaline earth metal hydroxide or oxide and (C) sulfur in the presence of a non-aqueous medium selected from the group consisting of at least one of sulfur, asphalt, thermoplastic resin and thermosetting resin, all components (A), (B) and (C) reacting at 90-200Â° C. thereby passivating the heavy metal waste (A) component, the amount of sulfur as component (C) or component (C) together with sulfur as the selected non-aqueous medium, being sufficient for its function of dispersing components (A), (B) and (C), and for its function of passivating heavy metals, and then cooling and solidifying the resulting melt mixture.