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Quantitative analysis of grain boundary fracture in the breakage of single multiphase particles using X-ray microtomography procedures / D. García in Minerals engineering, Vol. 22 N° 3 (Fevrier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 3 (Fevrier 2009) . - pp. 236–243 Titre : Quantitative analysis of grain boundary fracture in the breakage of single multiphase particles using X-ray microtomography procedures Type de document : texte imprimé Auteurs : D. García, Auteur ; C.L. Lin, Auteur ; J.D. Miller, Auteur Année de publication : 2009 Article en page(s) : pp. 236–243 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Froth  flotation  Liberation  Liberation  analysis  Mineral  processing  Ore  mineralogy Index. décimale : 622 Industrie minière Résumé : Direct determination of intergranular fracture during multiphase particle breakage is a difficult task to achieve. Perhaps the only method of analysis is measurement of interphase area before and after comminution. Conservation of interfacial area after crushing is indicative of transgranular random breakage. On the other hand, if interfacial area is diminished after breakage some degree of preferential grain boundary fracture has occurred. For complete liberation of all grains after crushing the interfacial area goes to zero. Thus the interfacial area criterion is an important metric to assess the significance of preferential grain boundary fracture for different breakage conditions. This study describes the development of procedures for detailed analysis to quantify the extent of preferential grain boundary fracture for different breakage conditions using X-ray microtomography (XMT). The breakage of single multiphase copper ore particles (3 mm cubic particles) by slow compression is examined. Procedures developed for interfacial area measurements are discussed and determination of the extent of grain boundary fracture of multiphase particles for different breakage conditions is presented. For the copper ore studied, it is shown that preferential grain boundary fracture occurs at low energy dissipation rates. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001842 [article] Quantitative analysis of grain boundary fracture in the breakage of single multiphase particles using X-ray microtomography procedures [texte imprimé] / D. García, Auteur ; C.L. Lin, Auteur ; J.D. Miller, Auteur . - 2009 . - pp. 236–243. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 3 (Fevrier 2009) . - pp. 236–243 Mots-clés : Froth  flotation  Liberation  Liberation  analysis  Mineral  processing  Ore  mineralogy Index. décimale : 622 Industrie minière Résumé : Direct determination of intergranular fracture during multiphase particle breakage is a difficult task to achieve. Perhaps the only method of analysis is measurement of interphase area before and after comminution. Conservation of interfacial area after crushing is indicative of transgranular random breakage. On the other hand, if interfacial area is diminished after breakage some degree of preferential grain boundary fracture has occurred. For complete liberation of all grains after crushing the interfacial area goes to zero. Thus the interfacial area criterion is an important metric to assess the significance of preferential grain boundary fracture for different breakage conditions. This study describes the development of procedures for detailed analysis to quantify the extent of preferential grain boundary fracture for different breakage conditions using X-ray microtomography (XMT). The breakage of single multiphase copper ore particles (3 mm cubic particles) by slow compression is examined. Procedures developed for interfacial area measurements are discussed and determination of the extent of grain boundary fracture of multiphase particles for different breakage conditions is presented. For the copper ore studied, it is shown that preferential grain boundary fracture occurs at low energy dissipation rates. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001842