Process for reparation of rutile seed crystals from coarse-granularity hydrolysis abnormal material

A technology for preparing gold and rutile, which is applied in the fields of titanium oxide/hydroxide, inorganic chemistry, titanium dioxide, etc., can solve the problem that the performance of titanium dioxide pigment is greatly affected, the activity of rutile calcined seed crystals is low, the whiteness of oil phase, dry powder whiteness In order to achieve the effects of low cost, improved color index and decolorizing power, and long storage time
CN109970099AInactive Publication Date: 2019-07-05JINAN YUXING CHEM
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JINAN YUXING CHEM
Publication Date
2019-07-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

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.
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Description

technical field

[0001] The invention relates to the field of titanium dioxide, in particular to a process for preparing rutile crystal seeds from hydrolyzed abnormal material with coarse particle size. Background technique

[0002] The metatitanic acid obtained from the hydrolysis of titanium sulfate solution is amorphous, and the product can be completely converted into rutile crystal form by calcination at high temperature for a long time. However, during the calcination process, sintering will occur seriously, and there are many lattice defects, and the crystal grains are too large and hard, which makes the product gray. Therefore, in industrial production, it is necessary to add some rutile promoters and crystal form regulators to metatitanic acid to make TiO 2 It grows at a reasonable speed and produces pigment particles with complete crystal transformation, moderate size and regular shape at a lower calcination temperature.

[0003] The rutile crystal seed is a rutil...

Claims

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