JMMCE  Vol.9 No.9 , September 2010
The Effect of Heat Treatment on Titania Slag
ABSTRACT
The paper embodies the influence of thermal treatment on the morphology, composition and leaching behaviour of titania slag. When Ti-slag was subjected to heat treatment, it developed pores and oxidized at high temperature. This slag consists mainly of a M3O5 phase with an orthorhombic structure. The decrepitation was studied by oxidizing the titania slag sample produced in a pot/muffle furnace at temperature 750℃. Sample oxidized at 750℃ cracked while sample treated at further high temperature did not show any cracking. The cracking of the samples was linked to decrepitation of the slags which is evidenced from the development of pores in the surface of the sample. From the available information it is postulated that cracks occurs due to change in the crystal lattice of the M3O5 phase of the slag after oxidation. The present study is directed to a process for the upgrading of titania slags into a product having a very high TiO2 content with low levels of alkaline-earth and other impurities.

Cite this paper
S. Samal, B. Mohapatra and P. Mukherjee, "The Effect of Heat Treatment on Titania Slag," Journal of Minerals and Materials Characterization and Engineering, Vol. 9 No. 9, 2010, pp. 795-809. doi: 10.4236/jmmce.2010.99057.
References
[1]   K. Borowiec, A.E. Grau, M. Gueguin and J.-F. Turgeon: “Method to upgrade titania slag and resulting products.” US Patent number 5,830,420, Nov.3, (1998).

[2]   J.P. Van Dyk, N.M. Vegter, C.P. Visser, T. de Lange, J.D. Winter, E.A. Walpole and J. Nell: “Beneficiation titania slag by oxidation and reduction treatment”. US Patent number 6,830,024 B1, Oct.12, (2004).

[3]   P.S. Mukherjee, T.K. Mukherjee, V.N. Misra, Trans. Indian Inst. Met.57 February 7, (2004), P. 71-77.

[4]   S. Samal, B.K. Mohapatra, P.S. Mukherjee and S.K. Chatterjee, “Integrated XRD,EPMA and XRF study of ilmenite and titania slag used in pigment production” J. alloys and compounds , Vol.474, 17th April (2009), P. 484-489.

[5]   J.R. Fisher, Heavy Minerals 1997, South African Institute of Mining and Metallurgy, Johannesburg, (1997), P. 207.

[6]   I. Robinson, Engineering news-mining (22 Apr.1994) P. 31.

[7]   F. Noguchi, T. Nakamura, Y. Ueda, T. Yanagase, Australia/Japan Extractive metallurgy Symposium,Sydney,Australia,16-18 July 1980, Australasian Institute of mining and Metallurgy, Parkville,Victoria,(1980),P. 479.

[8]   L.M. Juckes, Commission of the European Communities – technical Steel Research, Report no. EUR 13430, (1991).

[9]   J. Grzymek, A. Derdacka-Grzymek, Light metals 1990, Anaheim, California, February 1990, P. 18-22.

[10]   A. Okamoto, E. Futamura and K. Kawamura, Trans. Iron steel Inst.Jpn.21 1 (1981), P. 16.

[11]   N.A. Vasyutinskiy and E.E. Movsesov. Russ.Metall. 1 (1965), P. 56.

[12]   I. Toromanoff and F. Habashi, J.Less-Common Met.97 (1984), P.317.

[13]   A.F. Reid and J.C. Ward. Acta Chem.Scand.25 4 (1971), P. 1475.

[14]   D. Bessinger, J. M. A. Geldenhuis, P. C. Pistorius, A. Mulaba, G. Hearne, The decrepitation of solidified high titania slags”, Journal of Non-Crystalline Solids, Volume 282, Issue 1, April (2001), P. 132-142.

 
 
Top