Assessment of Super-gravity Concentrating V-containing Spinel Phase from Vanadium Slag

A new approach to concentrate V-containing spinel phase from vanadium slag by super gravity was investigated. The samples obtained by the gravity coefficient G ≥ 1050, time t ≥ 30 min and temperature T ≥ 1523 K appear significant layers and V-containing spinel phase presents gradient size distribution in the sample along the super gravity. The mechanism of moving speed of V-containing spinel particles in super gravity field was also discussed, and the conclusion indicates that the moving speed of V-containing spinel particles is proportional to the square of the V-containing spinel particle size. As a result, large size V-containing spinel particles move a farther distance than the small ones and gather at the bottom of the sample. Under the hypothesis that the vanadium and silicon exist in the slag in terms of V