TRANSACTION PAPER

 

Ilmenite smelting: The basics

 

 

P.C. Pistorius

Department of Materials Science and Metallurgical Engineering, University of Pretoria, Pretoria

 

 

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SYNOPSIS

While some of the practical details of ilmenite smelting are not well documented, there is a substantial body of literature on the principles of ilmenite smelting, and the behaviour of solidified titania slag. This information is summarized, focusing on the basic reactions, departure from equilibrium, the behaviour of impurities, and reactions of solidified slag. The emphasis is on the South African operations.

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References

1. KAHN, J.A. Non-rutile feedstocks for the production of titanium. Journal of Metals, vol. 36, no. 7, 1984. pp. 33-38.         [ Links ]

2. PISTORIUS, P.C. The relationship between FeO and Ti2O3 in ilmenite smelter slags. Scandinavian Journal of Metallurgy, vol. 31, 2002. pp. 120-125.         [ Links ]

3. GUÉGIN, M. and CARDARELLI, F. Chemistry and mineralogy of titania-rich slags. Part 1-hemo-ilmenite, sulphate, and upgraded titania slags. Mineral Processing and Extractive Metallurgy Review, vol. 28, 2007. pp. 1-58.         [ Links ]

4. ZIETSMAN, J.H. and PISTORIUS, P.C. Process mechanisms in ilmenite smelting. Journal of the South African Institute of Mining and Metallurgy, vol. 104, 2004. pp. 653-660.         [ Links ]

5. PISTORIUS, P.C. and COETZEE, C. Physico chemical aspects of titanium slag production and solidification. Metallurgical and Materials Transactions Series B, vol. 34B, 2003. pp. 581-588.         [ Links ]

6. PISTORIUS, P.C. Equilibrium interactions between freeze lining and slag in ilmenite smelting. Journal of the South African Institute of Mining and Metallurgy, vol. 104, 2004. pp. 417-422.         [ Links ]

7. ZIETSMAN, J.H. and PISTORIUS, P.C. Modelling of an ilmenite-smelting DC arc furnace process. Minerals Engineering, vol. 19, 2006. pp. 262-279.         [ Links ]

8. KUBASCHEWSKI, O., ALCOCK, C.B., and SPENCER, P.J. Materials thermochemistry, 6th edition. Oxford, Pergamon. 1993. pp. 258-323.         [ Links ]

9. GOUS, M. An overview of the Namakwa Sands ilmenite smelting operations. Journal of the Southern African Institute of Mining and Metallurgy, vol. 106, 2006. pp. 379-384.         [ Links ]

10. PISTORIUS, P.C. Fundamentals of freeze lining behaviour in ilmenite smelting. Journal of the Southern African Institute of Mining and Metallurgy, vol. 103, 2003. pp. 509-514.         [ Links ]

11. GRAU, A. and POGGI, D. Physico-chemical properties of molten titania slags, J.M. Toguri and G.C. Weatherly (eds.), Annual Volume 1978, Metallurgical Society of Canada, Institute of Mining & Metallurgy, Montreal, 1978, pp. 97-102.         [ Links ]

12. GARBERS-CRAIG, A.M. and PISTORIUS, P.C. Slag-refractory interactions during the smelting of ilmenite. South African Journal of Science, vol. 102, no. 11/12, 2006. pp. 575-580.         [ Links ]

13. ERIKSSON, G. and PELTON, A.D. Critical evaluation and optimization of the thermodynamic properties and phase diagrams of the MnO-TiO₂, MgO-TiO₂, FeO-TiO₂, Ti₂O₃-TiO₂, Na₂O-TiO₂, and K₂O-TiO₂ systems. Metallurgical and Materials Transactions B, vol. 24B. 1993. pp. 795-805.         [ Links ]

14. GELDENHUIS, J.M.A. and PISTORIUS, P.C. The use of commercial oxygen probes during the production of high titania slags. Journal of the Southern African Institute of Mining and Metallurgy, vol. 99, no. 1, 1999. pp. 41-47.         [ Links ]

15. ROSENQVIST, T. Ilmenite smelting. Transactions of the Technical University of Košice, vol. 2, special issue, 1992. pp. 40-46.

16. PESL, J. and ERIÇ, R.H. High-temperature phase relations and thermodynamics in the iron-titanium-oxygen system. Metallurgical and Materials Transactions B, vol. 30B, 1999. pp. 695-705.         [ Links ]

17. COETSEE, T. and PISTORIUS, P.C. Preliminary observations on phase relations in the 'V₂O₃-FeO' and V₂O₃-TiO₂ systems from 1400°C to 1600°C in reducing atmospheres. Journal of the American Ceramic Society, vol. 83, 2000. pp. 1485-1488.         [ Links ]

18. ERIKSSON, G., PELTON, A.D., WOERMANN, E., and ENDER, A. Measurement and evaluation of phase equilibria in the Fe-Ti-O system. Berichte der Bunsengesellschaft für physikalische Chemie, vol. 100, no. 11, 1996. pp. 1839-1849.         [ Links ]

19. BOROWIEC, K., GRAU, A.E., GUEGIN, M., and TURGEON, J.-F. Method to upgrade titania slag and resulting product.: U.S. Patent No. 5,830,420 (1998).         [ Links ]

20. VAN DYK, J.P., VEGTER, N.M., VISSER, C.P., DE LANGE, T., WINTER, J.D., WALPOLE, E.A., and NELL, J. Beneficiation of titania slag by oxidation and reduction treatment. U.S. Patent No. 6,803,024 (2004).         [ Links ]

21. BESSINGER, D., GELDENHUIS, J.MA., PISTORIUS, P.C., MULABA, A., and HEARNE, G. The decrepitation of solidified high titania slags. Journal of Non- Crystalline Solids, vol. 282, no. 1, 2001. pp. 132-142.         [ Links ]

22. BESSINGER, D. GELDENHUIS, J.M.A., and PISTORIUS, P.C. Phase changes in the decrepitation of solidified high titania slags. Heavy Minerals 2005, Society for Mining, Metallurgy and Exploration, 2005. pp. 213-219.         [ Links ]

23. PISTORIUS, P.C. and MOTLHAMME, T. Oxidation of high-titanium slags in the presence of water vapour. Minerals Engineering, vol. 19, 2006. pp. 232-236.         [ Links ]

24. COETZEE, C., LAMONT, P.H., BESSINGER, D., RABE, J., ZIETSMAN, J., and MULLER, J. Application of UCAR® Chill KoteT lining to ilmenite smelting. Eleventh International Ferroalloys Conference (Infacon XI), India, 2007. pp. 837-846.         [ Links ]

25. BESSINGER, D., BEUKES, P., and GLENEWINKEL, R. Granulation of titania slag. Heavy Minerals Conference 2007: Back to Basics. Southern African Institute of Mining and Metallurgy, 2007.         [ Links ]

26. BEÄN, R. and DU PREEZ, W. Titanium-the elusive metal. 6th Annual International Conference: Rapid Product Development Technologies for the Aerospace Industry, CSIR, International Conference Centre, Pretoria, 25-27 October, 2005. Available at http://www.csir.co.za/websource/ptl0002/pdf_files/msm/Titanium-TheElusiveMetal020BeanR.pdf (visited July 2007).         [ Links ]