Situ method for producing hydrosulfite bleach and use thereof

US5391526A · kind A · utility

Assignee

• Engelhard Corporation · US

Inventors

• Mitchell J. Willis · Macon, US
• Raymond H. Young · Macon, US
• Ellen S. Forbus · Calhoun, US
• Larry W. Donaldson · Macon, US

Key dates

• Filing date: Mar 14, 1994
• Grant date: Feb 21, 1995
• Expiry date: Mar 14, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/60
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for reacting metallic iron with sulfur dioxide (SO.sub.2) gas in the presence of water and bleachable matter, especially iron-contaminated kaolin clay, whereby the kaolin or the like is bleached in situ and the viscosity of the kaolin is less than it would be if bleached in a conventional manner.