| Téléchargement | - Voir le manuscrit accepté : Colloidal clay gelation: relevance to current oil sands operations (PDF, 1.5 Mio)
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| DOI | Trouver le DOI : https://doi.org/10.1080/10916466.2010.495959 |
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| Auteur | Rechercher : Mercier, P.H.J.1; Rechercher : Ng, S.; Rechercher : Moran, K.; Rechercher : Sparks, B.D.; Rechercher : Kingston, D.1; Rechercher : Kotlyar, L.S.1; Rechercher : Kung, J.1; Rechercher : Woods, J.; Rechercher : Patarachao, B.; Rechercher : McCracken, T.1 |
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| Affiliation | - Conseil national de recherches du Canada. Institut de technologie des procédés chimiques et de l'environnement du CNRC
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| Format | Texte, Article |
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| Sujet | bitumen recovery; gelation; oil sands; slime coatings; sludging; tailings; ultrafines |
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| Résumé | Ultrafines are predominantly delaminated colloidal clays with dimensions <0.9um that exist naturally in oil sands and are released during conditioning of surface-mined ores. Critical concentrations of these ultrafines and the cations present in process water are capable of forming flocculated structures with a very high water holding capacity. During primary separation of bitumen these ultrafines are detrimental to recovery as a result of increased slurry viscosity as well as through slime coating of released bitumen. Disposition into tailings ponds eventually produces mature fine tailings (MFT) as a result of thixotropic gel formation that entraps coarser solids. The ultrafines concentration of ~3 wt% observed in MFT coincides with the critical gelation concentration determined for suspensions of ultrafines in salt solutions with cationic concentration representative of that in pond water. This observation accounts for 100% of the water holding capacity of MFT and also explains why virtually no water is released once an MFT gel state has been formed. Here, we review earlier research in this area and identify the harmful effects of ultrafines in some current problematic ores. |
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| Date de publication | 2012-03-19 |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro du CNRC | NRCC 52084 |
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| Numéro NPARC | 19825804 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 2115f38d-0ef0-4380-8468-bfaca769a9e7 |
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| Enregistrement créé | 2012-04-19 |
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| Enregistrement modifié | 2020-04-21 |
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