Process for the recovery and separation of tantalum and niobium

US5209910A · kind A · utility

Assignee

• Hermann C. Starck GmbH & Co. KG · DE

Inventors

• Walter Bludssus · Vienenburg, DE
• Joachim Eckert · Bad Harzburg, DE

Key dates

• Filing date: Jun 24, 1991
• Grant date: May 11, 1993
• Expiry date: Jun 24, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22B34/24
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Improved solvent extraction recovery of tantalum and niobium oxides from an acid solution of raw materials containing such oxides wherein the charged organic solvent [e.g., MIBK] is washed out (a) with 8-16N sulfuric acid and then (b) with water or dilute HF. This avoids the use of a second mineral acid addition after digestion by HF of raw materials (and avoids problems attendant to use a second mineral acid).