Method for removing oil from tank cleaning oil sludge

The invention relates to a method for removing oil from tank cleaning oil sludge, which comprises the following steps of: screening the tank cleaning oil sludge, adding a green oil removing agent into a thermal washing stirring reaction tank by adopting a hot sewage solution of a sewage treatment plant, and stirring and thermally washing the oil sludge under the conditions of certain temperature and liquid-solid ratio; and then carrying out solid-liquid separation on the oil-containing slurry subjected to thermal washing by virtue of three-phase centrifugal separation equipment, and respectively treating dirty oil, sewage and mud sand. The method comprises the implementation steps of sorting pretreatment, stirring and thermal washing, slurry centrifugal dewatering and thermal washing, and dewatering post-treatment. The method is simple in process, low in equipment investment, low in operation cost and high in oil product recovery rate, a good treatment effect can be obtained by utilizing the method, great red