Preliminary investigations on alkali leaching kinetics of red sediment ilmenite slag

Tumula Laxmi; Rajalaxmi Mohapatra; Raghupatruni Bhima Rao

Korean Journal of Chemical Engineering, Vol.30, No.1, 123-130, January, 2013

DOI10.1007/s11814-012-0150-9 Export Citation

Preliminary investigations on alkali leaching kinetics of red sediment ilmenite slag

Tumula Laxmi, Rajalaxmi Mohapatra, and Raghupatruni Bhima Rao^†

CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India

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The present paper deals with soda ash roasting of red sediment ilmenite (47.03% TiO2) and leaching of obtained titanium rich slag with hydrochloric acid for preparation of synthetic rutile. The experimental conditions used for roasting are Na2CO3 to ilmenite ratio of 1 : 1 at 1,223 K for 4 h. This soda ash slag product is subjected to hydrochloric acid leaching to remove the iron content. The optimum conditions for leaching achieved are 6M hydrochloric acid at 398 K for 2.5 h (10/1 liquid/solid mass ratio) at 100 rpm. Shrinking core model is found to be fit for the experimental results. The apparent activation energy is 37.9 kJ/mol. This process of soda ash roasting is one of the best processes for preparation of high purity synthetic rutile assaying about 97.21% TiO2.

Keywords:Ilmenite;Soda Ash Roasting;Titanium Slag;Leaching;Synthetic Rutile

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[2] Lasheen TA, Hydrometallurgy., 93, 124 (2008)

[3] Lahiri A, Ind. Eng. Chem. Res., 49(18), 8847 (2010)

[4] Mohanty BP, Smith KA, Trans. Inst. Min. Metall., 102, C163 (1993)

[5] Jagasekera S, Marinovich Y, Avraamides J, Baily SI, Hydrometallurgy., 39, 183 (1995)

[6] Lanyon MR, Lwin T, Merritt RR, Hydrometallurgy., 51(3), 299 (1999)

[7] Van Dyk JP, Vegter NM, Pistorius PC, Hydrometallurgy., 65, 31 (2002)

[8] Sasikumar C, Rao DS, Srikanth S, Ravikumar B, Hydrometallurgy., 75, 189 (2004)

[9] Liang B, Li C, Zhang CG, Zhang YK, Hydrometallurgy., 76, 173 (2005)

[10] Mahmoud MHH, Afifi AAI, Ibrahim IA, Hydrometallurgy., 73(1-2), 99 (2004)

[11] Jalava JP, Indian Eng. Chem. Res., 31, 608 (1992)

[12] Lahiri A, Jha A, Metallurgical and Materials Transactions B., 38B, 939 (2007)

[13] Food Chemicals Index, National Academy Press, Third Ed., Washington, 327 (1981)