Recovery TiO2 by leaching process of carbothermic reduced Kalimantan ilmenite

Abstract

Iron and boron removal from sodium silicate using complexation methods AIP Conference Proceedings 1964, 020021 (2018) need to be explored to gain the high purity separation product. A new combination method named of carbothermic reduction, acidic-leaching and complexation by EDTA were proposed for separation TiO 2 from Ilmenite. Roasting of ilmenite was carried out at 950 °C for 1 h by the addition of activated carbon with mass ratio of ilmenite : activated carbon = 4:3. The carbothermic reduction was carried out to yield a high separation of initial content of ilmenite that will be easily to dissolve within hydrochloric acid solution in leaching process. The composition of ilmenite observed by X-Ray Fluoresences (XRF) changed after the carbothermic reduction process and the dominant content is TiO 2 (57.56%). X-Ray Diffraction (XRD) of roasted ilmenite composed of decomposed product of ilmenite i.e. hematite (Fe 2 O 3 ), TiO 2 anatase, TiO 2 rutile, and inorganic salt. The leaching of the roasted ilmenite has been done by sulphuric acid solution (6 M) to gain the titanyl sulphate solution. Separation of iron impurities of TiO 2 gel from titanyl sulphate (TiOSO 4 ) solution was conducted by complexation method using EDTA as a complexation agent. The characteristic of TiO 2 obtained using XRD showed that TiO 2 is anatase type and the percentage of TiO 2 using XRF showed that TiO 2 content of 86,03%.