Process for recovering the salt constituents from hardening-shop salt baths

US5769906A · kind A · utility

Assignee

• Durferrit GmbH Thermotechnik · DE

Inventors

• Mattias Kremer · Wiesbaden, DE
• Georg Wahl · Rodenbach, DE
• Eberhard Gock · Goslar, DE
• Stefan Wigger · Clausthal-Zellerfeld, DE
• Jorg Kahler · Clausthal-Zellerfeld, DE

Key dates

• Filing date: Sep 27, 1996
• Grant date: Jun 23, 1998
• Expiry date: Sep 27, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D1/46
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The process for environmentally acceptable and economical recovery of chloride salts from hardening-shop used salts utilizing the steps of leaching of the used salt, detoxification of the cyanide and selective crystallization of the individual chloride salts. The process is characterized in that all the chloride salts that are present in the hardening-shop used salt are recovered in pure form.