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Received December 13, 2011
Accepted July 5, 2012
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Preliminary investigations on alkali leaching kinetics of red sediment ilmenite slag
CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India
bhimarao@gmail.com, bhimarao@immt.res.in
Korean Journal of Chemical Engineering, January 2013, 30(1), 123-130(8), 10.1007/s11814-012-0150-9
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Abstract
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.
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Jagasekera S, Marinovich Y, Avraamides J, Baily SI, Hydrometallurgy., 39, 183 (1995)
Lanyon MR, Lwin T, Merritt RR, Hydrometallurgy., 51(3), 299 (1999)
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Jalava JP, Indian Eng. Chem. Res., 31, 608 (1992)
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