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
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
Carbides
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