Process for the recovery of titanium dioxide and value metals by reducing the concentration of hydrochloric acid in leach solution and system for same

摘要

#$%^&*AU2016204038A120160714.pdf#####Abstract A process for recovery of pigment grade titanium dioxide and value metals from a titanium bearing solid, the process comprising the steps of: (a) leaching the solid in hydrochloric acid to produce a leachate comprising undissolved solids and a leach solution comprising the titanium dioxide and the value metals, wherein the hydrochloric acid concentration is maintained above a value required to maintain the titanium dioxide and the value metals dissolved in the leach solution at atmospheric pressure; (b) separating the- leachate into the leach solution and the undissolved solids; and (c) reducing the concentration of hydrochloric acid concentration in the leach solution to recover titanium dioxide by hydrolysis and precipitation to produce a titanium dioxide rich slurry.