Abstract：With the technique ofthe coupling of mechanical activation and acid digestion, the reaction of the acid digestion of ilmenite was studied in a magnetically driven reactor filled with mill balls. The Effects of rotational rate of reactors, mass ratio of acid to ore, mass ratio of ball to ore and sulfuric acid concentration on acid digestion of ilmenite were investigated. The results indicated that coupling activation and leaching significantly enhanced the reaction. Under the conditions of H2SO4 mass fraction of 60%, mass ratio of acid to ore of 1.6:1, mass ratio of ball to ore of 10:1 and the reaction temperature of 90 oC, the conversion of titanium extraction reached 49% in 2 h. The stability of the titanyl sulfate solution was more than 450 mL. The ore and leaching residual were characterized by scanning electron microscope(SEM) and X-ray diffraction(XRD). The results indicated that the coupling of mechanical activation and acid digestion led to the crushing and size reduction of the particles frequently, and the renewal of the particles, which kept the milling activation continued and the liquid-solid reaction continuously conducted forward.
