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Precise Control Method of Particle Size of Primary Titanium Dioxide

A precise control, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problem of not being able to accurately control the particle size to the required range, and achieve the effect of good optical performance and large scattering power

Active Publication Date: 2019-03-19
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the existing technology only adjusts the particle size of the primary titanium dioxide product from the hydrolysis and calcination process, and cannot precisely control the particle size to the required range.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 adopts the method of the present invention to control the primary product particle size of titanium dioxide

[0041] Use the following method to control the particle size of the first product of titanium dioxide, and the specific operation steps are as follows:

[0042] a. Hydrolysis of titanium liquid

[0043] Preheat 3.8L of titanium solution with a concentration of 190g / L to 96°C, add dropwise to 1L of water within 15-20min, stir the titanium solution for hydrolysis at a stirring speed of 30rpm, and stop heating when the titanium solution reaches the gray point after hydrolysis;

[0044] Then the titanium liquid is aged, and stirred while aging, the stirring speed is 5rpm, and the aging time is 30min;

[0045] Heat the titanium liquid after aging, firstly heat to 100°C, keep boiling for 0.5h, then dilute the titanium liquid to 150g / l, heat to 100°C, keep boiling for 2h, hydrolysis is completed, and metatitanic acid is obtained; Stir the titanium liquid...

Embodiment 2

[0050] Embodiment 2 adopts the method of the present invention to control the primary product particle size of titanium dioxide

[0051] Use the following method to control the particle size of the first product of titanium dioxide, and the specific operation steps are as follows:

[0052] a. Hydrolysis of titanium liquid

[0053] Preheat 4.2L of titanium liquid with a concentration of 220g / L to 98°C, drop it into 1L of water within 15-20min, stir the titanium liquid for hydrolysis at a stirring speed of 20rpm, and stop heating after the titanium liquid is hydrolyzed to the gray point;

[0054] Then the titanium liquid is aged, and stirred while aging, the stirring speed is 8rpm, and the aging time is 40min;

[0055] Heat the titanium liquid after aging, firstly heat to 109°C, keep boiling for 1.5h, then dilute the titanium liquid to 170g / l, heat to 109°C, keep boiling for 3h, hydrolysis is completed, and metatitanic acid is obtained; Stir the titanium liquid while heating, ...

Embodiment 3

[0060] Embodiment 3 adopts the method of the present invention to control the particle size of the primary product of titanium dioxide

[0061] Use the following method to control the particle size of the first product of titanium dioxide, and the specific operation steps are as follows:

[0062] a. Hydrolysis of titanium liquid

[0063] Preheat 40L of titanium solution with a concentration of 240g / L to 96°C, add dropwise to 10L of water within 15-20min, stir the titanium solution for hydrolysis at a stirring speed of 10rpm, and stop heating when the titanium solution reaches the gray point after hydrolysis;

[0064] Then the titanium liquid is aged, and stirred while aging, the stirring speed is 5rpm, and the aging time is 30min;

[0065] Heat the titanium liquid after aging, firstly heat to 109°C, keep boiling for 1h, then dilute the titanium liquid to 160g / l, heat to 109°C, keep boiling for 2.5h, hydrolysis is completed, and metatitanic acid is obtained; Stir the titanium...

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Abstract

The invention relates to the technical field of preparation of titanium dioxide and in particular relates to a precise control method for grain size of a coarse titanium dioxide product, aiming at solving the problem that in the prior art, the grain size cannot be precisely controlled to a required range. The method comprises the following three steps: titanium liquid hydrolysis, metatitanate treatment and calcining. During titanium liquid hydrolysis, parameters such as the initial concentration of a titanium liquid, the stirring speed and the heating temperature and time of the titanium liquid are adjusted; types and contents of salts are adjusted during metatitanate treatment; the calcining treatment is divided into three sections, and the calcining temperature and time of each section are precisely controlled, so that the grain size of the coarse titanium dioxide product is precisely controlled. The method provided by the invention is simple to operate, and the average grain size of the coarse titanium dioxide product can be effectively controlled in a range of 250-270nm, so that the coarse titanium dioxide product is great in scattering force and good in optical property, and the coarse titanium dioxide product is universal titanium dioxide suitable for the field of coatings and the like.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide preparation, in particular to a method for precisely controlling the particle size of primary titanium dioxide. Background technique [0002] Titanium dioxide is considered to be the best white pigment in the world, widely used in coatings, plastics, paper making, ink printing, chemical fiber, rubber, cosmetics and other industries. For pigment grade titanium dioxide, the particle size and distribution are the key factors affecting the quality index of titanium dioxide products, which directly affect the performance and application performance of titanium dioxide pigments. When the particle size of titanium dioxide is about half of the wavelength of visible light scattering, the scattering force is the largest, that is, when the particle size of titanium dioxide is 250-270nm, its optical performance is optimal and its application range is wider. [0003] There are many factors affecting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/047
CPCC01G23/047C01P2004/64
Inventor 马维平王斌杜剑桥伍良英
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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