For alluvial tantalite-columbite, the minerals are basically liberated from the gangue with the useful mineral density over 4g/cm3 and sometimes the minerals are magnetic. Gravity separation is
mainly used as rough separation while combination of magnetic separation-gravity serration and magnetic separation-electric separation and floatation separation is adopted for the fine selection
of rough concentrate from gravity separation.
Ta2O5 35 to 45%
Nb2O3 4% to 6%
Fe2O3 8% to 12%
SnO2 1 to 2%
Th 70 to 80 ppm
U 700 to 900 ppm
