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A preparation method of hydrolyzed seed crystals in the process of producing titanium dioxide and titanium dioxide for matting agent produced by the method

A titanium dioxide and seed crystal technology, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problems of wide particle size distribution, poor ethylene glycol dispersibility, and high impurity content, and achieve low impurity content, good extinction ability, The effect of narrow particle size distribution

Active Publication Date: 2018-11-13
GUANGXI JINMAO TITANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new method for preparing hydrolyzed seed crystals in the method of adding seed crystals, and utilize this method to prepare titanium dioxide for matting agents, so as to overcome the wide particle size distribution and high impurity content of existing matting agent titanium dioxides. (high temperature 300°C) problems such as poor dispersion in ethylene glycol, so as to improve the quality of related products and enhance market competitiveness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] TiO 2 190-200g / L titanyl sulfate solution and 6% Na 3 PO 4 The solution was heated to 90°C according to the mass ratio of 7:1, and then the titanyl sulfate solution was added to Na 3 PO 4 Neutralization is carried out in the solution, and the flow rate is controlled to ensure that the reaction time is controlled within 6-8 minutes. After the neutralization reaction, the temperature was raised to 96°C, and the stability of the seed crystal was determined to be 100-130, and it was quickly put into the preheated hydrolyzed titanium solution. Wherein the test method of seed crystal stability is: measure 10ml seed crystal, add water until the volume of water consumed when the solution turns white and hydrolyzes. Practice has proved that there is a certain concentration of PO in the solution 4 3- Ions are more favorable for TiO 2 The dispersion of the sol to obtain hydrolyzed seeds with more uniform particle size is not only beneficial to the later washing process and ...

Embodiment 2

[0021] TiO 2 190-200g / L titanyl sulfate solution and 6% Na 3 PO 4 The solution was heated to 90°C according to the mass ratio of 6:1, and then the titanyl sulfate solution was added to Na 3 PO 4 Neutralization is carried out in the solution, and the flow rate is controlled to ensure that the reaction time is controlled within 6-8 minutes. After the neutralization reaction, the temperature was raised to 96°C, and the stability of the seed crystal was determined to be 100-130, and it was quickly put into the preheated hydrolyzed titanium solution. Practice has proved that there is a certain concentration of PO in the solution 4 3- Ions are more favorable for TiO 2 The dispersion of the sol to obtain hydrolyzed seeds with more uniform particle size is not only beneficial to the later washing process and less filtration loss, but also conducive to obtaining TiO with superior pigment performance. 2 The final product can give full play to the role of matting agent.

Embodiment 3

[0023] TiO 2 190-200g / L titanyl sulfate solution and 5% Na 3 PO 4 The solution was heated to 90°C according to the mass ratio of 6:1, and then the titanyl sulfate solution was added to Na 3 PO 4 Neutralization is carried out in the solution, and the flow rate is controlled to ensure that the reaction time is controlled within 6-8 minutes. After the neutralization reaction, the temperature was raised to 96°C, and the stability of the seed crystal was determined to be 100-130, and it was quickly put into the preheated hydrolyzed titanium solution. Practice has proved that there is a certain concentration of PO in the solution 4 3- Ions are more favorable for TiO 2 The dispersion of the sol to obtain hydrolyzed seeds with more uniform particle size is not only beneficial to the later washing process and less filtration loss, but also conducive to obtaining TiO with superior pigment performance. 2 The final product can give full play to the role of matting agent.

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Abstract

The invention relates to a method for preparing hydrolysis crystal seeds by reaction between a titanyl sulfate solution and a Na3PO4 solution. The method comprises the following steps: adding the titanyl sulfate solution at certain temperature into the Na3PO4 solution according to a certain mass ratio, and curing by stirring until the stability of the crystal seeds drops to the specified requirement; and producing the titanium white product for matting agents by the process. The titanium white obtained by hydrolysis has the advantages of excellent whiteness, high water-based dispersing power, favorable matting capacity, low impurity content, moderate particle size, narrow particle size distribution and the like, and is suitable to be used as a matting agent.

Description

technical field [0001] The invention relates to a method for preparing hydrolyzed seed crystals in the production process of sulfuric acid method titanium dioxide, and the titanium dioxide for matting agent produced by the method, belonging to the field of titanium dioxide production. Background technique [0002] Titanium dioxide is mainly used as a matting agent in the chemical fiber industry. At present, it is estimated that the annual consumption in the world is about 80,000 to 100,000 tons, and the domestic consumption is about 10,000 tons. Because titanium dioxide has special optical and physical properties in all white pigments, it is considered to be the most ideal matting material for chemical fibers, and has been widely used in the production of chemical fibers as a matting agent. Titanium dioxide for chemical fiber requires good dispersibility in water. For some varieties, it also needs good dispersibility in ethylene glycol, sodium thiocyanate and other solutions...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
CPCC01G23/0534C01P2004/62C01P2006/90
Inventor 柴春旺
Owner GUANGXI JINMAO TITANIUM
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