A novel preparation of titanium dioxide from titanium slag
DOI: 10.1016/j.hydromet.2008.08.002
Title: A novel preparation of titanium dioxide from titanium slag
Journal Title: Hydrometallurgy
Volume: 96
Publication Date: March 2009
Start Page: 52
End Page: 56
Published online: online 13 August 2008
ISSN: 0304-386X
Author: Yongjie Zhangab, Tao Qib, Yi Zhangb
Affiliations:

  • a China Centre of Recycle Economy Research, Economic and Management School, Beijing University of Aeronautics and Astronautics, Beijing 100083, PR China

  • b Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, PR China
  • Abstract: g>novel method of caustic hydrothermal decomposition of titanium slag followed by acidification of the sodium titanate product was adopted to prepare titanium dioxide. The effects of temperature, sodium hydroxide concentration, alkali-to-titanium slag mass ratio and reaction time on the titanium extraction were studied. Almost complete extraction of titanium was achieved when finely ground titanium slag (− 61/+51μm) was reacted with a NaOH solution with a concentration of 10mol kg− 1 H2O and the alkali-to-titanium slag (based on TiO2) mass ratio of 4:1 at 220°C for about 4h. The XRD pattern shows that the hydrothermal product obtained under optimal conditions was Na4Ti3O8. Titanium dioxide with a rutile structure was obtained by acidification and cation exchange of Na4Ti3O8. The effects of pH value, temperature, mass ratio of liquid-to-solid, and different acid medium on the product of cation exchange were studied together with the variation of titanium and iron concentration in solution. Under optimal conditions, the purity of titanium dioxide was > 99.0%.
    Accepted: 2 August 2008
    Received: 9 May 2008
    Revised: 28 July 2008
    Keywords: Titanium slag; Caustic hydrothermal decomposition; Sodium titanate; Titanium dioxide; Rutile
    Fax: +86 10 62631710
    Email: tqgreen@home.ipe.ac.cn

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