Article | REF: M2365 V2

Metallurgy and recycling of niobium and tantalum

Author: Christian POLAK

Publication date: June 10, 2009

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5. Oxides

Oxide quality has risen sharply thanks to improvements in the hydrometallurgical process. At H.C. Starck, the metal impurity content of Ta 2 O 5 fell from 1,350 to 22 ppm by mass between 1980 and 1990 [8] .

These improvements have been achieved thanks to :

  • a better understanding of the solvent extraction process;

  • greater control over material flows, concentrations and acidity;

  • the use of more corrosion-resistant materials in reactors.

The production of high-purity oxides for optical applications, such as the synthesis of crystals for optoelectrics, follows its...

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Oxides