Reducing agent for the soluble chromate content of cement and methods for production thereof

US8808451B2 · kind B2 · utility

Assignee

• Crenox GmbH · DE

Inventors

• Michael Vössing · Bochum, DE
• Auer Gerhard · Krefeld, DE
• Benno Laubach · Krefeld, DE
• Detlef Klein · Krefeld, DE
• Werner Schuy · Tönisvorst, DE
• Klaus Köllisch · Krefeld, DE
• Erwin Weiss · Hofheim, DE
• Werner Bahl · Recklinghausen, DE
• Philip Reese · Nelson, NZ

Key dates

• Filing date: Feb 13, 2012
• Grant date: Aug 19, 2014
• Expiry date: Feb 13, 2032

Classification

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

Abstract

The invention relates to a reducing agent for the soluble chromate content of cement and to methods for the production thereof, which comprise concentrating an used sulfuric acid, containing iron (II) sulfate, and separating the sulfuric acid from the obtained precipitate which contains iron (II) sulfate.