Process for producing a phosphate of the lanthanoids, and phosphate produced thereby

US7270793B2 · kind B2 · utility

Assignee

• Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

• Ulrich Müller · Neustadt, DE
• Dieter Schmidt · Bayreuth, DE
• Martin Zachau · Geltendorf, DE
• Franz Zwaschka · Ismaning, DE

Key dates

• Filing date: Dec 16, 2004
• Grant date: Sep 18, 2007
• Expiry date: Sep 16, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K11/7777
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for producing a phosphate of the lanthanoids is described. The process is based on a two-jet precipitation, starting from separate reservoirs of a rare earth salt solution and a phosphate solution which are introduced simultaneously by separate feedlines into an aqueous acidified initial charge with stirring at a pH of 0≦pH≦1. After the solutions are added, the pH is raised to a pH of >2 to complete the phosphate precipitation.