Preparation method of coated iron oxide black with medium temperature resistance

The invention relates to a preparation method of temperature resistant iron oxide black, and discloses coated iron oxide black with medium temperature resistance. According to the preparation method, a plurality of layers of compact films are coated on the surfaces of iron oxide molecules, so that the heat resistance of iron oxide black is improved. The method mainly comprises the steps of firstly stirring iron oxide black filter cake into pulpous state, then adding aluminum ions and silicon ions, ensuring that ion precipitate is gradually coated on the surface of the iron oxide black molecules by adjusting pH value, so as to form a plurality of protecting films to ensure that the heated temperature of coated iron oxide black reaches 200 DEG C. According to the method, coating treatment process is performed on the surface of iron oxide pigment to passivate the surface, the treatment method is advanced, and coated pigment ions are uniform, and have high strength and superior dispersion property. Accessory ingr