3.4. occurred as NH4VO3 (Chmielewski et al., 1997; Habashi,

3.4. Vanadium
Separation

The alkaline leachate
of the roasted concentrate was subjected to the precipitation of silica and
alumina; it was then left to stay overnight to allow the crystallization of
sodium sulfate as a purification step. The filtrate was divided into two parts;
the first was used for the direct precipitation of vanadium, whereas the second
was used for the ion-exchange separation.

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3.4.1.
Precipitation of silica and alumina

The alkaline
leachate of the roasted titanium concentrate of 79%TiO2 has pH