H. C. Starck, Gmbh & Co Kg

Hermann C. Starck Gmbh & Co. Kg

Herman C. Starck Berlin Gmbh & Co. Kg

Joachim Eckert

Walter Bludssus

Klaus Rieger

Kurt Tolle

Jochen Weber

Process for the production of tantalum-niobium concentrates from low-tantalum, high-niobium raw materials with an Nb.sub.2 O.sub.5 /Ta.sub.2 O.sub.5 ratio of 5 to 15 in a pyrometallurgical concentration process by smelting with carbon-containing reducing agents, reductions and resmelting.

Process for the production of tantalum-niobium concentrates

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).

Process for the recovery and separation of tantalum and niobium

A highly pure tantalum pentoxide powder and a process for its preparation are disclosed. The powder is substantially free of impurities and is further characterized by improved flow characteristics.

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Bad Harzburg, Germany

Joachim Eckert