Process for treating a waste material

B - Operations – Transporting – 03 – B

Patent

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B03B 9/06 (2006.01) B01D 21/02 (2006.01) B01J 6/00 (2006.01) B03B 9/02 (2006.01) C04B 7/12 (2006.01) B01D 21/24 (2006.01) B01D 21/26 (2006.01)

Patent

CA 2189180

A method of treating a dilute aqueous suspension of solid particulate material comprising waste material from a process for recovering petroleum from oil sand includes diluting the suspension with at least 75% of its own volume of water thereby to increase the settling rate of the particulate material and allowing the particulate material to settle to form a concentrated solid sediment. The treated suspension may have been obtained from a process in which an alkaline solution is used to treat the oil sand. The water from which the concentrated solid sediment is separated may be returned to the process for recovering petroleum from oil sand. The solid sediment may be transferred to a separation vessel in which it is fractionated into a coarse particle fraction and a fine particle fraction. The fine particle fraction may comprise essentially particles having an equivalent spherical diameter not greater than 3µm. The concentrated solid material recovered may be calcined to form a pozzolanic material.

Cette invention concerne une méthode de traitement d'une suspension aqueuse diluée de solides particulaires renfermant des résidus d'un procédé d'extraction de pétrole des sables bitumineux. Ledit procédé de traitement comprend la dilution de la suspension par ajout d'un volume d'eau représentant au moins 75 % de son volume afin d'augmenter la vitesse de sédimentation des solides particulaires et de faire en sorte que les particules forment un sédiment solide compact. La suspension à traiter peut avoir été obtenue d'un procédé faisant appel à une solution alcaline pour traiter les sables bitumineux. L'eau dont on extrait le sédiment solide peut être recyclée dans le procédé d'extraction de pétrole des sables bitumineux. Le sédiment solide peut être transféré dans un séparateur permettant d'obtenir une fraction à grains grossiers et une fraction à grains fins. Cette dernière fraction peut se composer essentiellement de particules ayant une diamètre sphérique équivalent d'au plus 3µm. Le matériau solide concentré peut être calciné pour former un pouzzolane.

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