Method for processing iron-laden spent sulfuric acid

US7537749B2 · kind B2 · utility

Assignee

• Tronox Pigments GmbH · DE

Inventors

• Gerhard Auer · Krefeld, DE
• Berndt-Ullrich Kohler · Krefeld, DE
• Benno Laubach · Krefeld, DE

Key dates

• Filing date: Oct 1, 2004
• Grant date: May 26, 2009
• Expiry date: Jun 22, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S423/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention concerns a method for processing heavy metal-laden spent sulfuric acid. For this, iron-laden spent sulfuric acid or iron-laden sulfuric materials obtained therefrom are reacted with a material that contains iron chloride and optionally other metal chlorides, producing iron (II) sulfate. The spent sulfuric acid preferably derives from titanium dioxide production.