|About this Abstract
||Part C-1: Hydrometallurgy 2018
||A Novel Environmental-friendly Process to Prepare High Purity TiO2 Powder from Titania Slag
||Ying Zhang, Xiaofang Zhu, Shili Zheng, Zak Fang, Michael L. Free
|On-Site Speaker (Planned)
||Michael L. Free
Titanium dioxide is an important chemical which is produced by either the chloride or the sulfate processes. However, the environmental issues associated with the sulfate process are severe, since the sulfuric acid with a low centration of ~20 wt%(~4.7 mol/L H+) cannot be cost-effectively recycled to the slag digestion unit, which has to be neutralized, generating a large amount of wet and useless red gypsum (RG). In this research, the authors find that the titania slag can be effectively digested using a weaker acid solution of lower than 6 mol/L H+ when the chemically-stable slag is transformed into titanium oxide in a lower valence state via a thermochemical reduction in moderate conditions; thus the generation of the waste solid RG can be avoided. By combining the three key steps of structure rebuilding, weak acid digestion, and controlled hydrolysis, a new process is proposed for production of high-purity TiO2.
||Planned: At-meeting proceedings