The invention discloses a method for preparing a high water dispersibility
titanium dioxide. The method comprises the following steps sequentially: a, adding a dispersing agent into a
titanium dioxide
slurry, and stirring uniformly; b, adding a
phosphorus-containing solution, and curing; c, adding an aluminum
sulfate solution to control the pH value of the
titanium dioxide
slurry to be 1.5 to 4.5, and curing; d, adding a
sodium metaaluminate solution to control the pH value of the
titanium dioxide slurry to be 8.5 to 10.5, and curing; e, adjusting the pH value of the
titanium dioxide slurry to be 7.0 to 7.8, and curing; f, filtering, washing,
drying, and pulverizing to obtain the high water dispersibility
titanium dioxide. According to the method, before
coating, the dispersing agent is added to improve a dispersing condition of the titanium dioxide slurry, then the
phosphorus-containing solution and the aluminum-containing solution are used as a
coating agent, and then the
coating agent is deposited on the surface of titanium dioxide in forms of
aluminum phosphate and
hydrated alumina, so that the water dispersibility of a product is effectively improved, and the titanium dioxide product with the high water dispersibility is obtained.