Process for reducing sludge accumulation in the hot water...

B - Operations – Transporting – 01 – F

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B01F 17/54 (2006.01) B03B 9/02 (2006.01)

Patent

CA 2134962

A dispersant, such as sodium silicate, is added to the process water of the hot water extraction process which recovers bitumen from oil sands. The dispersant disperses the ultrafine (less than 300 nm) particles, to reduce the formation of flocs and sludge in the tailings pond. The volume of the pond is such that the retention time of process water is sufficiently short (less than 6 weeks when using sodium silicate) to avoid reforming flocs from the dispersed ultrafines. The ultrafines content in the process water builds up as the water is repeatedly recycled from the pond to the extraction process. The ultrafines content stabilizes at a steady state level as some ultrafines are continuously removed from the water supply when the tailings are delivered onto the "beach" of the pond and become trapped in the sand.

Cette invention consiste à ajouter un agent dispersant tel que le silicate de sodium à l'eau du procédé d'extraction à l'eau chaude servant à récupérer le bitume de sables bitumineux. Cet agent disperse les particules ultrafines (inférieures à 300 nm) pour limiter la formation de flocs et de boues dans le bassin de résidus. Le volume du bassin détermine une durée de rétention de l'eau de procédé assez courte (moins de 6 semaines avec utilisation de silicate de sodium) pour éviter la reformation de flocs à partir des particules ultrafines dispersées. La concentration de ces particules dans l'eau de procédé augmente étant donné que l'eau est recyclée à plusieurs reprises entre le bassin de résidus et le procédé d'extraction. La teneur en particules ultrafines se stabilise à un certain niveau du fait que certaines particules ultrafines quittent continuellement l'alimentation en eau lorsque les résidus atteignent la « plage » du bassin où ils restent emprisonnés.

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