Thermal Treatment of Titania Slag under Oxidation-Reduction Conditions

Authors

  • T.A.I. Lasheen Nuclear Materials Authority, P.O. Box 530 El Maadi, Cairo, Egypt
  • M.E.H. Shalabi Central Metallurgical Research and Development Institute, Cairo, Egypt

DOI:

https://doi.org/10.18321/ectj261

Abstract

The present work provides a method for beneficiating of an Egyptian titanium slag by a thermal oxidation and reduction in a controlled gas atmosphere to obtain leachable slag suitable for use as a feed material in the production of TiO2 by chlorination process. The mechanism of that process has been studied and the proposed reactions are presented. The effect of oxidation on the enrichment of titanium into rutile phase by blowing oxygen into the slag was studied at relatively high temperatures (900-1100 °C) for different times (30-90 min). Heating of a fully divided slag under oxidizing conditions resulted in a major portion of iron in the ferric state Fe3+ and titanium species in Ti4+ state. The results demonstrate that through oxidation, the content of pseudobrookite and rutile phases increase. Reducing of the pre-oxidized slag was carried out using hydrogen gas at 800 °C for different period of times to convert the major portion of iron in ferric state Fe3+ to ferrous state Fe2+. As a result of these treatments most of titania phases were converted into rutile. Thereafter, the reactive ore was treated with aqueous HCl acid then sodium hydroxide solutions to leach impurities to obtain a beneficiated product with an increased TiO2 content.

References

(1). Ogasawara T., Veloso de Araujo, R.V., Hydrometallurgy. 56:203 (2000).

(2). Jayasekera S., Marinovich Y., Avraamides J. and Bailey S.I., Hydrometallurgy, 39:183 (1995).

(3). Lasheen T.A.I., Hydrometallurgy, 76:123 (2005).

(4). Elger G.W., Stadler R.A. and Sankar P.E., 1977. US Patent No. 54120694, USA.

(5). Elger G.W., Write J.B., Tress J.E., Bell H.E. and Jordan R.R., USBM, Report No. R19003, 1986.

(6). Borowiec K. Scandinavian journal of metallurgy, 20:198 (1991).

(7). Gueguin M., 1995. US Patent No. 5,389,355.

(8). Borowiec K., Grau A.E., Gueguin M. and Turgeon J.F., 1998. US Patent, No. 5,830,420.

(9). Van Dyk J.P., Vegter N.M., Visser C.P., De lange T., Winter J.D., Walpole E.A. and Nell J., 2004. US Patent, No. 6,803,024 B1.

(10). Sinha H.N., Hills S. and Waugh, 1977. D.MB. US Patent No. 3,597,189.

(11). Sahu K.K., Alex T.C., Mishra D. and Agrawal A., Waste Manage Res. 24:74 (2006).

(12). Pistorius C.P. and Motlhamme T., Minerals Engineering, 19:232 (2006).

(13). Eriksson G., Pelton A.D., Wermann E., and Ender A.., Berchte der Bunsen-Gesellschaft fur physikalische Chemie, 11:1839 (1996).

(14). Pauling L.Z., Kristallogr., Krisllgeom Kristallphys., Kristall. Chem., 73 (1930).

(15). Calculated from, ICSD Using Powd-12++(1997).

(16). Jones D.G., The Institution of Mining and Metallurgy, 186 (1973).

(17). Meagher E. P and Larger G.A., Can Mineral, 17:77 (1979).

(18). Novosadova, et al., Ukr. Chim. Zh. (Russ. Ed), No. 52:704 (1986).

(19). Robinson M., Clamp F., Aberdeen D., Mobbs D.B. and Pearse R.V., 1975. US Patent No. 3,875,286.

(20). Robinson I., Engineering News. Mining, 25 Septemper (1992).

(21). Sinha H.N.1979. Solubility of titanium minerals. In P reprints international Conference on "Advances in chemical metallurgy" Bhabha Atomic research center, Bombay, India, 1979, 2, paper 35.

(22). Haggerty S. E and Lindsley D.H., Rep. Dir. Geophys Lab. Camegie Inst, 68:247 (1968-69).

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Published

2007-03-20

How to Cite

Lasheen, T., & Shalabi, M. (2007). Thermal Treatment of Titania Slag under Oxidation-Reduction Conditions. Eurasian Chemico-Technological Journal, 9(2), 105–111. https://doi.org/10.18321/ectj261

Issue

Vol. 9 No. 2 (2007)

Section

Articles

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