Abstract: Based on the polarization effect of electrostatic field on polar components, the strong electric field was used to break the balance system of residue to remove nickel and vanadium. The effect of temperature (70-160℃)，residence time (0.5-4h)，solvent/residue mass ratio (0.5-6) and electric field intensity (1 500-7 500v/cm) on the removal ratio of nickel and vanadium were investigated. Results showed that increasing temperature and mass ratio of solvent/residue could reduce the viscosity of residue and facilitate movement and sedimentation of the nickel-containing and vanadium-containing components in the residue；increasing the electric field intensity was conducive to promote the agglomeration of polar components of nickel and vanadium compounds in the residue. The removal ratio of nickel and vanadium were 61.4% and 70.4%, respectively，under the optimum conditions of a temperature of 160 ℃，a solvent/residue mass ratio of 4，a residence time of 2 h and an electric field intensity of 4500 V/cm，and the yield of purified residue was 88.2%.

Key words: electric field, residue, nickel, vanadium