1. Harben P W. The Industrial Minerals HandyBook, 3rd Edition, London, UK. 1999, 216–223
2. Becher R G, Canning R G, Goodheart B A, Uusna S. A new process for upgrading ilmenite minerals sands. Proc. Australas. Inst. Min. Metall. 1965, 21: 1261–1283
3. Chen James H, Tex C C. US Patent, 3825419, 1974
4. Schoukens A F S, Morris D J, Stephen MC. US Patent, 6733561 B2, 2004
5. Sahu K K, Alex T C, Mishra D, Agrawal A. An overview on the production of pigment grade titania from titania-rich slag. Waste Manage Res, 2006, 24: 74–79