Removal of cadmium from acidic phosphatic solutions

US4492680A · kind A · utility

Assignee

• Chemische Fabrik Budenheim KG · DE

Inventors

• Klaus Frankenfeld
• Peter Ruschke · Budenheim, DE
• Peter Brodt · Idstein, DE
• Gerhard Eich · Ingelheim am Rhein, DE

Key dates

• Filing date: May 18, 1983
• Grant date: Jan 8, 1985
• Expiry date: May 18, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention is concerned with a process of removing cadmium from acid, especially P.sub.2 O.sub.5 -containing solutions by liquid/liquid extraction with the aid of alkyl amine salts that are dissolved in an inert, organic solvent. The cadmium ions are removed from the acid, aqueous phase and are enriched in the organic phase. The cadmium-containing organic phase, subsequently, is re-extracted with an aqueous salt solution, with the cadmium ions migrating from the organic phase into the aqueous phase. The process is particularly suitable for extracting cadmium from concentrated, highly acid aqueous solutions.