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http://dx.doi.org/10.7844/kirr.2019.28.5.68

Recovery of High Purity TiO2 Powder from Ilmenite by Hydrochloric Acid Leaching  

Ahn, Hyeong Hun (Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University)
Lee, Man Seung (Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University)
Publication Information
Resources Recycling / v.28, no.5, 2019 , pp. 68-73 More about this Journal
Abstract
Ilmenite is one of the principal ores for the production of titanium dioxide. To produce titanium dioxide with purity higher than 99.9% from ilmenite, Ti(IV) should be separated from the dissolved impurities such as Fe(III), Si(IV), and Mn(II) present in ilmenite. In this work, a hydrometallurgical process was investigated to recover pure titanium dioxide from ilmenite by HCl leaching followed by separation and hydrolysis of Ti(IV). An optimum leaching condition was obtained by investigating the effect of HCl concentration, pulp density, and leaching time on the leaching percentage of Ti(IV), Fe(III), Si(IV), and Mn(II). Ammonium hydroxide and sodium hydroxide solutions were employed as neutralizing agents to hydrolyze Ti(IV) from the stripping solution of Ti(IV). Titanium dioxide of the anatase phase was obtained by calcination of the hydrolyzed precipitates with $NH_4OH$ solution. A hydrometallurgical process can be developed to produce pure $TiO_2$ powders from ilmenite.
Keywords
Ilmenite; $TiO_2$; Leaching; HCl; Hydrolysis;
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