Alkali roasting of bomar ilmenite: Rare earths recovery and physico-chemical changes

Journal ar
Open Chemistry
  • Volumen: 13
  • Número: 1
  • Fecha: 01 enero 2015
  • Páginas: 270-278
  • ISSN: 23915420
  • Tipo de fuente: Revista
  • DOI: 10.1515/chem-2015-0033
  • Tipo de documento: Artículo
  • Editorial: De Gruyter Open
© 2015 Sergio Sanchez-Segado, Abhishek Lahiri, Animesh Jha, licensee De Gruyter Open.In this work, the alkali roasting of ilmenite (FeTiO3 ) is presented as a process route for integrated beneficiation of the mineral for rutile-rich phase and rare earth oxides; the latter is released as a consequence of physical changes in the ilmenite matrix, during the water leaching after roasting. The oxidative alkali roasting transforms ilmenite mineral into water-insoluble alkali titanate and water-soluble ferrite. After roasting the insoluble alkali titanate is separated from rareearth oxide mixture in colloidal form and water-soluble ferrite. Further leaching of alkali titanate is carried out with oxalic (0.3M) and ascorbic (0.01M) acid solution which removes the remaining Fe2+ ions into the leachate and allows precipitation of high-purity synthetic rutile containing more than 95% TiO2 . Iron is removed as iron oxalate. The physico-chemical changes occurred during the roasting and leaching processes are reported by comparing the role of alkali on the roasting process and product morphologies formed.

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