Tungstic acid powder consisting of spherical tungsten particles and method for producing same

US8052956B2 · kind B2 · utility

Assignee

• H.C. STARCK INC. · US

Inventors

• Sven Albrecht · Goslar, DE
• Armin Olbrich · Seesen, DE
• Michael Reiss · Baltimore, US
• Frank Schrumpf · Goslar, DE
• Juliane Meese-Marktscheffel · Goslar, DE
• Uwe Kutzler · Bad Harzburg, DE

Key dates

• Filing date: Apr 28, 2005
• Grant date: Nov 8, 2011
• Expiry date: Aug 26, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2982
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Process for the production of a powdered spherical tungstic acid by acidification of an aqueous alkaline tungstate solution with mineral acid at elevated temperature, preferably in a continuous stirred tank or a cascade of at least 2 continuous stirred tanks, and tungstic acid obtainable in this way, which is characterized by a high bulk density and spherical morphology.