PROCESS FOR DE-ZINCING OF GALVANIZED STEEL SCRAP

• Main Author: AUER, Gerhard
• Format: Patent
• Language: English; French
• Published: 15.02.2024
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; FERROUS OR NON-FERROUS ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The present invention relates to waste treatment and provides a process for depletion of zinc from Zn-coated Fe by subjecting the Zn-coated Fe to a leaching step in an acidic solution comprising Fe3+ to provide an acidic solution containing Zn2+ and Fe2+; obtaining a metallic Fe substrate depleted from zinc; and separating Fe2+ from Zn2+ to provide a Zn2+-containing product and a Fe2+ salt. La présente invention concerne un traitement de déchets et fournit un procédé d'appauvrissement en zinc à partir de Fe revêtu de Zn par soumission du Fe revêtu de Zn à une étape de lixiviation dans une solution acide comprenant Fe3+ pour fournir une solution acide contenant Zn2+ et Fe2+; l'obtention d'un substrat de Fe métallique appauvri en zinc ; et la séparation de Fe2+ de Zn2+ pour fournir un produit contenant du Zn2+ et un sel de Fe 2+.