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

摘要

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 V2O3 and SiO2, with the parameter of G = 1050, t = 30 min, T = 1523 K, the mass fraction of V2O3 and SiO2 in the concentrate is 18.92 and 7.42, while that of the tailing is 6.86 and 24.48 respectively. Considering that the mass fraction of V2O3 and SiO2 is 13.34 and 15.25 in the parallel sample, the recovery ratio of V in the concentrate is 74.60, while the removal ratio of Si is 75.59 by centrifugal concentration.