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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

Active Publication Date: 2016-02-17
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, there is no relevant report on controlling the proportion of small particles.

Method used

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  • Method for reducing small-granular titanium dioxide in titanium dioxide
  • Method for reducing small-granular titanium dioxide in titanium dioxide
  • Method for reducing small-granular titanium dioxide in titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The concentration is 235g / L (as TiO 2 The left and right titanium liquid and water were preheated to 96°C respectively, and the mass ratio of titanium liquid and water was 3.8 to 1. Start stirring at 75rmp, and add the preheated titanium solution to the preheated water within 20min to form a mixed solution.

[0038] Raise the temperature of the mixed solution to boiling (first boiling), and keep it in a boiling state. When the mixed solution turns steel gray (gray point), stop stirring and heating, and start stirring after 35 minutes at a speed of 35 rpm. Continue heating to boiling (second boiling), turn on the stirring speed after the second boiling to 60rpm, add water 1.5h after the second boiling, and make the concentration of metatitanic acid after hydrolysis be 165g / L (as TiO 2 Calculated), and then hydrolyzed for 2h to end.

[0039] After the hydrolysis, the metatitanic acid is filtered and washed, bleached, salt treated, calcined, and post-treated to obtain ti...

Embodiment 2

[0043] The concentration is 230g / L (as TiO 2 The left and right titanium liquid and water are preheated to 96°C respectively, and the mass ratio of titanium liquid and water is 4:1. Start stirring at 75rmp, and add the preheated titanium solution to the preheated water within 20min to form a mixed solution.

[0044] Raise the temperature of the mixed liquid to boiling (first boiling), and keep boiling for a period of time. When the mixed liquid turns steel gray (gray point), stop stirring and heating for 30 minutes, then start stirring at a speed of 30rmp, and continue heating until boiling (two boiling), after the second boiling, the stirring speed was turned on at 50rpm, and 2.0h after the second boiling, water was added so that the concentration of metatitanic acid after hydrolysis was 160g / L (based on TiO 2 meter), and then hydrolyzed for 1.5h to end.

[0045] After the hydrolysis, the metatitanic acid is filtered and washed, bleached, salt treated, calcined, and post-trea...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
CPCC01G23/0532C01P2004/51C01P2004/62C01P2006/60
Inventor 罗志强任亚平胡素玲杜剑桥张强周玉昌侯盛东郑少华杨仰军
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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