The invention provides a
magnetic separation enhanced type electromagnetic
thermal desorption method and device for remediating contaminated sites. The method is characterized in that ferromagnetic materials, such as reducing
iron powder, are doped into contaminated soil in an ex-situ mixing and stirring manner, the contaminated soil spirally stirred is heated by using
electromagnetism, and a
thermal desorption heat transfer gasifying effect is improved through the in-situ electromagnetic eddy heating of the ferromagnetic materials; the reaction activity and
oxidation reduction capability of the ferromagnetic materials are improved when the ferromagnetic materials produce heat; after
thermal desorption is finished, the ferromagnetic materials of which the surfaces react and adsorb pollutants can be separated from the contaminated soil through
magnetic separation, recycled and reutilized; and the continuous remediation of contaminated soil is realized. The device also can be used for the in-situ remediation of contaminated soil. After the ferromagnetic materials are added to the soil in situ through a ploughing stirring device, the soil is heated in situ by utilizing an
electromagnetic induction coil to carry out excitation eddy heating in the contaminated soil, pollutants are desorbed, and at the same time, the reaction activity of the magnetic materials(for example, reducing
iron powder) can be improved; and after reaction is finished, the
iron powder can be separated from the contaminated soil through a
magnetic separation technology. The device also can be placed in soil to realize in-situ
oxidation reduction degradation. The method and device are suitable for the in-situ thermal
desorption remediation of circumjacent large area of low-concentration contaminated soil.