A study on the solvent extraction with D2EHPA in sulfuric acid solutions containing Ti4+ and Fe3+ ions

This study was carried out to find fundamental conditions for effective solvent extraction of Ti and Fe components from leaching solution of reaction product of (NH4)2SO4 and titaniferous magnetite ore. In experiment of solvent extraction of Ti and Fe components, new aqueous phase which contains only Ti(4), Fe(3) was used instead of leaching solution of sulfation product. The extraction of Ti(4) and Fe(3) components from aqueous phase with D2EHPA (Di-2-ethyl hexyl phosphoric acid)-kerosine system was carried out as function of concentration of extractant in the organic phase, pH of agueous phase and shaking time. The maximum value of separation factor(β) was 102.6 at 0.05 M D2EHPA, agueous phase pH 1.0, and 30 min was sufficient for the condition of shaking time. In stripping of Ti and Fe components from organic phase, the higher temperature and more concentration of H2SO4 increased the stripping percent of Ti and Fe components and the stripping percent of Fe was always higher than that of Ti. In separation process of Ti and Fe components, when 2 step stripping process was used, 93.7%, 99.5% Ti and Fe components was obtained respectively. While, 3 stage continuous countcurrent process was used, 96.3%, 84.7% of Ti and Fe components was obtained respectively.(Author)