| 摘要 |
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 th en hydrotransported to a separation vessel, preferably under high shear conditions. At the separati on 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 dispose d of and the middlings stream is transported to a flotation tank and subjected to a secon d frothing process, preferably using hydrogen peroxide either alone or with additional air sparging.
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