Evidence for surface cleaning of sulphide minerals by attritioning in stirred mills / Ye, X. in Minerals engineering, Vol. 23 N° 11-13 (Octobre 2010)  

Public ISBD [article]  inMinerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 937–944 Titre : Evidence for surface cleaning of sulphide minerals by attritioning in stirred mills Type de document : texte imprimé Auteurs : Ye, X., Auteur ; S. Gredelj, Auteur ; W. Skinner, Auteur Année de publication : 2011 Article en page(s) : pp. 937–944 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Attrition Stirred milling Flotation Surface oxidation Résumé : Recent developments in large scale stirred milling technology using ceramic media have allowed its application to relatively coarse particle streams. Apart from benefits in grinding finer more efficiently, benefits may also be derived from the surface cleaning action of stirred mills. This paper discusses evidence for the cleaning action of a stirred mill on the surfaces of chalcocite and effects on its subsequent flotation. Single mineral samples of chalcocite were ground with either stainless or mild steel grinding media. The effects of surface contamination by iron hydroxide on chalcocite floatability were studied using ethylene diamine-tetra acetic acid (EDTA) extraction, X-ray photoelectron spectroscopy (XPS) surface analysis and contact angle measurements. Depression of both coarse (+75 μm) and fine (−10 μm) size fractions was attributed to the surface precipitation of iron hydroxide species. Transfer of iron hydroxides from coarse particles to fine particles was observed with XPS analysis. Recovery of coarse particles (+75 μm) was improved by attritioning, while additional collector was needed to fully restore chalcocite recovery in both fine and coarse size fractions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510000646 [article] Evidence for surface cleaning of sulphide minerals by attritioning in stirred mills [texte imprimé] / Ye, X., Auteur ; S. Gredelj, Auteur ; W. Skinner, Auteur . - 2011 . - pp. 937–944. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 937–944 Mots-clés : Attrition Stirred milling Flotation Surface oxidation Résumé : Recent developments in large scale stirred milling technology using ceramic media have allowed its application to relatively coarse particle streams. Apart from benefits in grinding finer more efficiently, benefits may also be derived from the surface cleaning action of stirred mills. This paper discusses evidence for the cleaning action of a stirred mill on the surfaces of chalcocite and effects on its subsequent flotation. Single mineral samples of chalcocite were ground with either stainless or mild steel grinding media. The effects of surface contamination by iron hydroxide on chalcocite floatability were studied using ethylene diamine-tetra acetic acid (EDTA) extraction, X-ray photoelectron spectroscopy (XPS) surface analysis and contact angle measurements. Depression of both coarse (+75 μm) and fine (−10 μm) size fractions was attributed to the surface precipitation of iron hydroxide species. Transfer of iron hydroxides from coarse particles to fine particles was observed with XPS analysis. Recovery of coarse particles (+75 μm) was improved by attritioning, while additional collector was needed to fully restore chalcocite recovery in both fine and coarse size fractions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510000646

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Sensor information monotonicity in disambiguation protocols / Ye, X. in Journal of the operational research society (JORS), Vol. 62 N° 1 (Janvier 2011)  

Public ISBD [article]  inJournal of the operational research society (JORS) > Vol. 62 N° 1 (Janvier 2011) . - pp. 142–151 Titre : Sensor information monotonicity in disambiguation protocols Type de document : texte imprimé Auteurs : Ye, X., Auteur ; Fishkind, D. E., Auteur ; Abrams, L., Auteur Année de publication : 2011 Article en page(s) : pp. 142–151 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Probabilistic path planning Dynamic disambiguation Index. décimale : 001.424 Résumé : Previous work has considered the problem of swiftly traversing a marked traversal-medium where the marks represent probabilities that associated local regions are traversable, further supposing that the traverser is equipped with a dynamic capability to disambiguate these regions en route. In practice, however, the marks are given by a noisy sensor, and are only estimates of the respective probabilities of traversability. In this paper, we investigate the performance of disambiguation protocols that utilize such sensor readings. In particular, we investigate the difference in performance when a disambiguation protocol employs various sensors ranked by their estimation quality. We demonstrate that a superior sensor can yield superior traversal performance—so called Sensor Information Monotonicity. In so doing, we provide to the decision-maker the wherewithal to quantitatively assess the advantage of a superior (and presumably more expensive) sensor in light of the associated improvement in performance. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n1/abs/jors2009152a.html [article] Sensor information monotonicity in disambiguation protocols [texte imprimé] / Ye, X., Auteur ; Fishkind, D. E., Auteur ; Abrams, L., Auteur . - 2011 . - pp. 142–151. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 62 N° 1 (Janvier 2011) . - pp. 142–151 Mots-clés : Probabilistic path planning Dynamic disambiguation Index. décimale : 001.424 Résumé : Previous work has considered the problem of swiftly traversing a marked traversal-medium where the marks represent probabilities that associated local regions are traversable, further supposing that the traverser is equipped with a dynamic capability to disambiguate these regions en route. In practice, however, the marks are given by a noisy sensor, and are only estimates of the respective probabilities of traversability. In this paper, we investigate the performance of disambiguation protocols that utilize such sensor readings. In particular, we investigate the difference in performance when a disambiguation protocol employs various sensors ranked by their estimation quality. We demonstrate that a superior sensor can yield superior traversal performance—so called Sensor Information Monotonicity. In so doing, we provide to the decision-maker the wherewithal to quantitatively assess the advantage of a superior (and presumably more expensive) sensor in light of the associated improvement in performance. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n1/abs/jors2009152a.html

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