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Energetics of mechanical activation / C. Sasikumar in Minerals engineering, Vol. 22 N° 6 (Mai 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 572–574 Titre : Energetics of mechanical activation : Application to ilmenite Type de document : texte imprimé Auteurs : C. Sasikumar, Auteur ; S. Srikanth, Auteur ; N.K. Mukhopadhyay, Auteur Année de publication : 2009 Article en page(s) : pp. 572–574 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Oxide  ores  Grinding  Particle  size  Surface  modification  Mineral  processing Résumé : An attempt is made to measure the energy stored in the material during mechanical activation and its manifestation in various forms (defects, new surfaces and interfaces, strain and structural disorder) through direct energy measurements, calorimetry, surface area and surface energy measurements. The elastic strain, grain size and extent of amorphisation is estimated from XRD analysis. The strain energy is calculated using the theory of elasticity and the amorphisation energy from thermodynamic calculations. For ilmenite, the energy transferred to the material is about 6% of the specific energy consumption in 4 h of planetary milling. A major part of the energy is stored as elastic strain energy, structural disorder and in point and line defects whereas the energy stored in additional surfaces and grain boundaries are comparatively much lower. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000284 [article] Energetics of mechanical activation : Application to ilmenite [texte imprimé] / C. Sasikumar, Auteur ; S. Srikanth, Auteur ; N.K. Mukhopadhyay, Auteur . - 2009 . - pp. 572–574. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 572–574 Mots-clés : Oxide  ores  Grinding  Particle  size  Surface  modification  Mineral  processing Résumé : An attempt is made to measure the energy stored in the material during mechanical activation and its manifestation in various forms (defects, new surfaces and interfaces, strain and structural disorder) through direct energy measurements, calorimetry, surface area and surface energy measurements. The elastic strain, grain size and extent of amorphisation is estimated from XRD analysis. The strain energy is calculated using the theory of elasticity and the amorphisation energy from thermodynamic calculations. For ilmenite, the energy transferred to the material is about 6% of the specific energy consumption in 4 h of planetary milling. A major part of the energy is stored as elastic strain energy, structural disorder and in point and line defects whereas the energy stored in additional surfaces and grain boundaries are comparatively much lower. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000284