Preparation process of near-infrared high-reflectivity titanium white pigment magnesium aluminum titanate

The invention relates to a preparation method of a near-infrared high-reflectivity titanium white pigment magnesium aluminum titanate, which comprises the following steps: preparing slurry with a certain concentration from an intermediate hydrated titanium dioxide produced from sulfuric acid-process titanium dioxide which is qualified by washing, adding an inorganic magnesium compound in a certainproportion into the slurry, uniformly stirring, heating the slurry to 50-70 DEG C, slowly adding a sodium metaaluminate solution in a certain proportion to generate coprecipitation, completely precipitating by adjusting the pH value, uniformly stirring, adding zinc chloride or zinc sulfate, uniformly stirring, carrying out spray drying treatment on the slurry to obtain a slurry, and calcining, crushing, sanding and spray-drying the obtained material to obtain a qualified near-infrared high-reflectivity aluminum magnesium titanate white pigment aluminum magnesium titanate finished product. Theprocess is simple and con