Process for treating oily sludge

The invention relates to a process for treating oily sludge and is particularly applicable to the oily sludge generated in the wastewater treatment process of an oil refinery. The process has the following steps of: after performing anhydration treatment on centrifugally dehydrated oily sludge in rotary-type anhydration treatment equipment under certain negative pressure and temperature control to destroy a water, oil and solid stabilizing system of the oily sludge, evaporating part of oil and water in the oily sludge, and performing solvent extraction treatment on coke generated after the anhydration. Solid residue obtained after treatment reaches the solid emission standard; the wastewater generated in the process can reach standard after biochemical treatment and is discharged; the extracted oil can be used as fuel or used for refining; and an extractant can be regenerated and recycled. The process has main characteristics of high sludge anhydrating and extracting speed, high efficiency, good effect, mild operating condition, little energy consumption, good sludge treatment effect and simple equipment operation and maintenance.