Process for recovering hydrocarbons from tar sands

Details Process for recovering hydrocarbons from tar sands Process for recovering hydrocarbons from tar sands

C - Chemistry, Metallurgy

10

G

C10G 27/12 (2006.01) B01D 12/00 (2006.01) B03D 1/00 (2006.01) C10G 1/04 (2006.01)

Patent

CA 2428544

An improved process for extracting hydrocarbons from tar sands and the like includes the steps of digestion, separation/flotation, and secondary flotation. The digestion step comprises the formation of a relatively thick aqueous slurry of the tar sands, which is then hydrotransported to a separation vessel, preferably under high shear conditions. At the separation vessel, the slurry is diluted and treated with an oxidant such as hydrogen peroxide to generate a gas within the slurry and to form a froth on the surface thereof. The froth entrains most of the hydrocarbon component, which are subsequently extracted. The coarse tailings are disposed of and the middlings stream is transported to a flotation tank and subjected to a second frothing process, preferably using hydrogen peroxide either alone or with additional air sparging.

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