A Denver DR floatation machine was used to perform froth floatation.
A full factorial analysis was used to determine the most effective parameters influencing the floatation process of El-Lajjun oil shale (Table 1).
Floatation agents kerosene, DMSO, calcium lignosulfonate, sodium lignosulfonate, sulphonated naphthalene, diethyl ketone, and Fuel oil #2 were used as collectors.
Thereafter the solution was placed in the floatation cell, air flow rate was adjusted to 2 L/min, and the rotation speed of the impeller was kept at 1000 Rev/min.
The amount of ash left is taken for indicator of the amount of enhancement or the recovery of organic material by floatation.
The maximum enhancement was approximately around 3% achieved in two stages froth floatation as shown in Table 3.
The floatation of oil shale from a mixture of oil shale and phosphate has shown a high recovery of oil shale in the froth since most of the phosphate has stayed in the tailing part.
Similarly, floatation of oil shale in a mixture of oil shale and calcite has shown a high recovery of oil shale in the froth layer.
Floatation of oil shale has shown a poor recovery of oil-rich components with a maximum of 3% enhancement when using fuel oil #2 as a collector.