Nanoparticle flotation collectors for pentlandite

CIM Journal, Vol. 5, No. 2, 2014

S. Yang and R. Pelton
Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada

M. Xu and Z. Dai
Vale Base Metals Technical Excellence Centre, Mississauga, Ontario, Canada

Des nanoparticules de polystyrène hydrophobe ont été évaluées en termes de collecteurs potentiels lors de la flottation de la pentlandite. La flottation de billes de verre hydrophiles a démontré la capacité des nanoparticules à induire la flottation. La déposition de nanoparticules sur des surfaces de verre a augmenté l’angle de contact et a amélioré l’adhésion des billes aux bulles d’air. Des récupérations élevées par flottation ont été atteintes lorsque de 5 à 10 % des surfaces des billes étaient couvertes de nanoparticules. La fonctionnalisation de la surface – l’ajout de vinylimidazole aux surfaces des nanoparticules de polystyrène – a fait en sorte que les nanoparticules se déposaient de manière sélective sur les surfaces de la pentlandite en présence de schlamms fins Mg-Si. Les travaux en cours comprennent des essais pour identifier des applications spécifiques dans lesquelles des collecteurs de nanoparticules pourraient être rentables.
Mots clés : Flottation, collecteur de nanoparticules, couverture, angle de contact, adhésion aux bulles,
pentlandite, récupération, sélectivité
Résumé Des nanoparticules de polystyrène hydrophobe ont été évaluées en termes de collecteurs potentiels lors de la flottation de la pentlandite. La flottation de billes de verre hydrophiles a démontré la capacité des nanoparticules à induire la flottation. La déposition de nanoparticules sur des surfaces de verre a augmenté l’angle de contact et a amélioré l’adhésion des billes aux bulles d’air. Des récupérations élevées par flottation ont été atteintes lorsque de 5 à 10 % des surfaces des billes étaient couvertes de nanoparticules. La fonctionnalisation de la surface – l’ajout de vinylimidazole aux surfaces des nanoparticules de polystyrène – a fait en sorte que les nanoparticules se déposaient de manière sélective sur les surfaces de la pentlandite en présence de schlamms fins Mg-Si. Les travaux en cours comprennent des essais pour identifier des applications spécifiques dans lesquelles des collecteurs de nanoparticules pourraient être rentables.
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