Preparation of pulverulent zirconium dioxide

US5840641A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans-Josef Sterzel · Schifferstadt, DE
• Werner Hesse · Großburgwedel, DE

Key dates

• Filing date: May 6, 1997
• Grant date: Nov 24, 1998
• Expiry date: May 6, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/80
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In the preparation of pulverulent zirconium dioxide by dissolving a zirconium compound in formic acid, removing the volatile components and calcining the residue, a chloride-free zirconium compound is dissolved in a formic acid/water mixture and the zirconium dioxide is obtained in a manner known per se.