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

Abstract

Separation of titanium dioxide (TiO 2) from ilmenite Bangka has been done byleaching processusing HCl. Before the leaching process, ilmenite was roastedat 900 o C for pre-oxidation (preliminary - oxidation). Leaching process carried out by variation of HCl concentration and Fe 0 reducing agents. While the re-deposition of dissolved Ti 4+ ion achieved by hydrolysis - condensation using 2-propanol-H 2 O solvents. Leaching the pre-oxidazed ilmenite shows the phase change of  pseudobrokite (Fe 2 TiO 5) into hematite (Fe 2 O 3) and synthetic rutile (TiO 2). Formation of the synthetic rutile was characterized by the loss of intensity of Fe 2 TiO 5 at 26.65º and the increasing intensity of rutile TiO 2 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: Fe 0 ratio. Precipitation of the dissolved titania with 2-propanol -H 2 Oof 8:2(v /v) produced anatase TiO 2 due to the hydrolysis and condensation of Ti-tetra isopropoxide complexes.