The flotability and mechanism of the composite tantalite-niobite minerals which have different content of the Ta, Nb. Fe,Mn with styrenephosphonic acid (SPA) as c
The hydrogen reduction of tungsten oxides WO<sub>2.90</sub>,W<sub>20</sub>O<sub>58</sub> and WO<sub>3</sub> were directly studied using high temperature X-raydi