The invention relates to a process for preparation of
rutile seed crystals from a coarse-
granularity hydrolysis abnormal material. The process includes the following steps that a
metatitanic acid hanging film as a coarse-
granularity hydrolysis abnormal material is washed, beaten to 300-350 g / L and pre-heated, alkaline liquor is pre-heated according to the alkali-to-
titanium ratio of (1.5-1.8):1,
metatitanic acid is added for curing after pre-heating, water is added for
dilution, alkaline liquor is cooled to be 70 DEG C, and a
titanate is obtained; the hanging film is washed to obtain titanateslurry,
hydrochloric acid is added to make the pH value become 2.8-3.1, the temperature rises to 60 DEG C, and the pH is adjusted to be 2.8-3.1 with
hydrochloric acid;
hydrochloric acid is added again, heating is performed until boiling occurs, the boiling state is maintained, water is added to be 95-105 g / L, and then the
rutile seed crystals are obtained. The method is simple, the cost is low, the
rutile conversion rate is high, the
seed crystal storage time is long, when the seed crystals are used for preparation of
titanium dioxide, the obtained
titanium dioxide is small in particle size, the conversion rate is high, and the
color index and the lightening power are significantly improved.