Method for reducing small-granular titanium dioxide in titanium dioxide

A small particle, titanium dioxide technology, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problem of controlling the proportion of small particles not seen, and achieve the effect of reducing the proportion, improving the covering power, and increasing the granularity
CN105329941AActive Publication Date: 2016-02-17PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
Publication Date
2016-02-17

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Abstract

The invention belongs to the field of sulfate process titanium dioxide preparation, particularly relates to a method for reducing small-granular titanium dioxide in titanium dioxide and aims to solve the technical problem that the average grain diameter of sulfate process general type titanium dioxide is 250-300 nm and the proportion of small grains with the grain diameter smaller than 180 nm is higher. According to the scheme for solving the technical problem, the method for reducing small-granular titanium dioxide in titanium dioxide comprises steps as follows: a, a titanium liquid and water are preheated respectively, stirring starts, the titanium liquid is added to the water, and a mixed liquid is formed; b, the mixed liquid is heated to be boiled for the first time; the boiling state is kept, stirring and heating are stopped when the mixed liquid reaches a grey point, after 25-40 min, stirring starts, and the mixed liquid is heated continuously to be boiled for the second time; c, when the mixed liquid is boiled for the second time, water is added for hydrolysis; d, metatitanic acid obtained after hydrolysis is filtered, washed, bleached and subjected to salt treating, calcination and aftertreatment, and a titanium dioxide product is obtained. According to the method, the proportion of the small-granular titanium dioxide in the titanium dioxide product is reduced, and the covering power of the product is improved.
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Description

technical field

[0001] The invention belongs to the field of sulfuric acid method titanium dioxide preparation, and in particular relates to a method for reducing small particles of titanium dioxide in titanium dioxide. Background technique

[0002] As a white pigment, titanium dioxide has good hiding power, whiteness, decolorization power, weather resistance, etc., and is widely used in coatings, plastics, inks and papers and other fields. The hiding power of titanium dioxide is one of the important indicators. It directly reflects the most important feature that distinguishes titanium dioxide from other white pigments, and its value has a great impact on its application performance and economy. Therefore, improving the hiding power of titanium dioxide is an important task for relevant research institutions and production enterprises. The main factors affecting the hiding power of titanium dioxide are particle size and distribution, dispersion, pigment volume concentration...

Claims

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