The invention discloses a preparation method of high-dispersion
titanium dioxide, which comprises the following steps: S1, pulping a
titanium dioxide base material, and then sequentially sanding, vibratory screening and
cyclone classification; s2, inorganic
coating; s3, carrying out
solid-liquid separation on the
slurry subjected to inorganic
coating, washing with water, adding water and hydroxyl-containing polyatomic acid, and pulping again; s4, sanding again; s5, heating, adding a first organic treatment agent, and carrying out
microwave treatment; and S6, carrying out
solid-liquid separation on the
slurry,
drying, carrying out steam
grinding, and adding a second organic treatment agent during steam
grinding, so as to obtain the high-dispersion
titanium dioxide. According to the method, firstly, the
slurry before
coating is specially treated to remove large particles, then the
filter cake after coating and washing is re-pulped, the hydroxyl-containing polyatomic acid is adopted for pretreatment, and sanding and
microwave treatment are combined, so that the organic treatment agent is bridged on the surface of
titanium dioxide more stably, the
titanium dioxide slurry is completely prevented from forming aggregates before being dried, and the service life of the
titanium dioxide slurry is prolonged. Therefore, the high-dispersion titanium dioxide is prepared.