OPTIMIZING OF TIO2 SEPARATION FROM BANGKA ILMENITE BY LEACHING PROCESS USING HCL

Abstract

Separation of titanium dioxide (TiO₂) from ilmenite Bangka has been done byleaching processusing HCl. Before the leaching process, ilmenite was roastedat 900^oC for pre-oxidation (preliminary - oxidation). Leaching process carried out by variation of HCl concentration and Fe⁰ reducing agents. While the re-deposition of dissolved Ti⁴⁺ ion achieved by hydrolysis - condensation using 2-propanol-H₂O solvents. Leaching the pre-oxidazed ilmenite shows the phase change of  pseudobrokite (Fe₂TiO₅) into hematite (Fe₂O₃) and synthetic rutile (TiO₂). Formation of the synthetic rutile was characterized by the loss of intensity of Fe₂TiO₅ at 26.65º and the increasing intensity of rutile TiO₂ at 27.49º.The dissolution rate of both titanium and iron was found to be increased, generally, by increasing acid concentration in case of HCl as well as by increasing ilmenite: Fe⁰ ratio. Precipitation of the dissolved titania with 2-propanol -H₂Oof 8:2(v /v) produced anatase TiO₂ due to the hydrolysis and condensation of Ti-tetra isopropoxide complexes.