Method for regulating size of nano iron oxide yellow, nano iron oxide yellow and application of nano iron oxide yellow

The invention relates to the technical field of iron oxide pigments, and particularly discloses a method for regulating and controlling the size of nano iron oxide yellow, the nano iron oxide yellow and application of the nano iron oxide yellow. The nano iron oxide yellow comprises iron oxide yellow, and the surface of the iron oxide yellow is coated with a nitrogen positive ion type protective agent layer; the nano iron oxide yellow is subjected to chemical acid etching treatment; the grain size of the nano iron oxide yellow subjected to chemical acid etching treatment is 200-600nm; the preparation method comprises the following steps: mixing iron oxide yellow, a nitrogen positive ion type protective agent and acid to obtain a mixed solution; stirring and mixing the mixed solution for 1-10 hours under the condition of 50-150 DEG C to obtain a reaction solution; and cooling the reaction liquid to 20-25 DEG C, filtering, collecting a solid, washing the solid, and drying to obtain the nano iron oxide yellow. By