Separation and recovery of bitumen oil from tar sands
A process for the separation of bitumen oil from tar sands and the like. Slurry is supplied to a mixing chamber of a jet pump at an input end of the process. The slurry is agitated within the jet pump to effect a partial to full phase separation of the oil fraction from the solids fraction of the slurry. The partially to fully separated slurry is discharged into a pipeline and later into a hydrocyclone to effect a second phase separation of the slurry. One or more hydrocyclone separators may be used to separate the bitumen oil and liquid from the solids fraction.
1. A process for phase separation of a slurry containing a mixture of a solids fraction and an oil and water fraction, the process comprising the steps of:
depositing the slurry into a receiving hopper at an input point of a separation process, the receiving hopper having an outlet, wherein the receiving hopper is free of phase separation devices;
supplying the slurry from the outlet of the receiving hopper into a mixing chamber of a jet pump at the input point of the separation process, the jet pump being supplied with wash fluid from a power source, wherein the jet pump operates at a Reynolds number above 250,000;
agitating the slurry within the mixing chamber of the jet pump to effect an initial partial to full phase separation of the oil and water fraction from the solids fraction of the slurry;
discharging the partially to fully separated oil and water fraction and solids fraction of the slurry from the jet pump into a pipeline for continued separation through mixing and contact with the wash fluid within the pipeline; and
discharging the partially to fully separated mixture of the oil and water fraction and the solids fraction of the slurry from the pipeline into a phase separation device to effect a second phase separation of the slurry and produce a first output stream comprising the solids fraction and a second output stream comprising the oil and water fraction.
2. The process of claim 1 in which the slurry comprises unprocessed tar sand from a mining or drilling operation.
3. The process of claim 1 further comprising repeating the process steps of claim 1 to yield a solids fraction and chemically conditioning the solids fraction with calcium oxide.
4. The process of claim 1 further comprising treating all or portions of the first output stream with a thermal screw to produce a solids fraction free of any residual water and hydrocarbons.
5. The process of claim 1 in which the phase separation process uses a hydrocyclone.
6. The process of claim 1 in which the slurry comprises tailings from a mining or drilling operation.