Anodic Extraction of Titanium from Low-grade (δ)-Ti-C-O Alloy by Fused-Salt Electrolysis

Abstract

Extractive electrolysis in a fused NaCl-KF-K₂TiF_x bath at 850°C using anode material of (δ)-Ti-C-O (C=7.36%, O=16.6%) was carried out at anodic potentials ranging from +780 to +1800 mV(vs.Ti). From the experimental results, the process of extraction as a whole was considered as
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where n=1,2,3,…,∞, increases with anodic potential.
But lower oxides of n=1∼3 thus formed do not remain in the residues because of the comparatively high solubilities to the bath, so the residues contain only higher oxides such as TiO₂, Ti₅O₉ or Ti₆O₁₁, and decomposed free carbon.
When the anodic potential is sufficiently high (about +1800 mV vs.Ti), extraction accompanied by gas evolution can also proceed.