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Influence of ascorbate and oxalic acid for the removal of iron and alkali from alkali roasted ilmenite to produce synthetic rutile / Abhishek Lahiri in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8847–8851 Titre : Influence of ascorbate and oxalic acid for the removal of iron and alkali from alkali roasted ilmenite to produce synthetic rutile Type de document : texte imprimé Auteurs : Abhishek Lahiri, Auteur Année de publication : 2010 Article en page(s) : pp. 8847–8851 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ascorbic  acids Résumé : Leaching of the alkali roasted product was undertaken for the removal of iron and alkali to produce synthetic rutile. The process was carried out in presence of oxalic and ascorbic acids. It was observed that in presence of ascorbic acid the dissolution of iron oxide increased as Fe2+ ions were generated rapidly which then formed ferrous oxalate. Alkali ions were also removed in the process as the pH of the leaching medium was maintained below 4. The production of Fe2+ ions started as early as 30 min whereas the formation of iron oxalate started after 2 hours into the leaching process. In this paper we describe the reaction chemistry in the leaching process by characterizing the samples using Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive X-ray techniques. After the leaching process, greater than 95% pure synthetic rutile was achieved. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100893q [article] Influence of ascorbate and oxalic acid for the removal of iron and alkali from alkali roasted ilmenite to produce synthetic rutile [texte imprimé] / Abhishek Lahiri, Auteur . - 2010 . - pp. 8847–8851. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8847–8851 Mots-clés : Ascorbic  acids Résumé : Leaching of the alkali roasted product was undertaken for the removal of iron and alkali to produce synthetic rutile. The process was carried out in presence of oxalic and ascorbic acids. It was observed that in presence of ascorbic acid the dissolution of iron oxide increased as Fe2+ ions were generated rapidly which then formed ferrous oxalate. Alkali ions were also removed in the process as the pH of the leaching medium was maintained below 4. The production of Fe2+ ions started as early as 30 min whereas the formation of iron oxalate started after 2 hours into the leaching process. In this paper we describe the reaction chemistry in the leaching process by characterizing the samples using Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive X-ray techniques. After the leaching process, greater than 95% pure synthetic rutile was achieved. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100893q