Heat and water recovery from oil sands waste streams

C - Chemistry – Metallurgy – 10 – C

Patent

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C10C 3/00 (2006.01) C10G 1/04 (2006.01) F26B 3/04 (2006.01)

Patent

CA 2677479

Methods and systems for recovering heat and water from waste streams produced during oil sands extraction to form dry, stackable tailings. A tailings stream is preheated in a heat exchanger, thereby reducing the energy required to dry the tailings. The preheated tailings are then dried, thereby reducing the tailings to dry stackable tailings or thickened tailings suitable for mine backfill. Heat and high-quality water are recovered from the drying operation and re-used in the preheat operation, or in other steps of oil sands extraction or treatment processes, thereby reducing the overall heat and water requirements.

Méthodes et systèmes de récupération de chaleur et d'eau de flux de déchets produits par l'extraction de sables bitumineux pour former des rejets secs et empilables. Un flux de rejets est préchauffé dans un échangeur de chaleur, ce qui réduit l'énergie nécessaire au séchage des rejets. Ces derniers, préchauffés, sont ensuite séchés, pour les réduire à des rejets empilables ou épaissis qui peuvent servir à remblayer des mines. La chaleur et l'eau de haute qualité sont récupérées par l'opération de séchage et sont réutilisées lors de l'opération de préchauffage, ou lors d'autres opérations d'extraction de sables bitumineux ou pour des processus de traitement, ce qui réduit les besoins d'ensemble en chaleur et en eau.

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