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Surface modified titanium dioxide preparation method and surface modification equipment thereof

A surface modification, titanium dioxide technology, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problems of low dispersibility, slow hydrolysis rate, complicated control conditions, etc., and achieve the effect of excellent quality

Inactive Publication Date: 2019-04-26
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional seed crystal preparation method is to dissolve titanium ore with concentrated sulfuric acid, and then add sodium hydroxide solution to hydrolyze to obtain seed crystals. This method has a slow hydrolysis rate, relatively complicated control conditions, and is also affected by the concentration, acidity, temperature, etc. Influence of parameters
The obtained seed crystals contain impurity metal elements such as iron and vanadium in the raw materials, resulting in too many impurities in the finished titanium dioxide, and the size of the seed crystals is not uniform, and the dispersion is low.

Method used

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  • Surface modified titanium dioxide preparation method and surface modification equipment thereof

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specific Embodiment 1

[0025] A kind of preparation method of surface modified titanium dioxide, its concrete steps are as follows:

[0026] Step 1, the titanyl sulfate solution of 180g / L~210g / L (with TiO 2 Calculation) and K at a concentration of 20g / L 3 PO 4 solution, respectively heated to 70°C, and according to the volume ratio of 15:1, the titanyl sulfate solution was slowly added to K 3 PO 4 Neutralize in the solution, and control the flow rate to ensure that the reaction time is controlled within 10 minutes;

[0027] Step 2, add SiO at the same time 2 +MgO equal ratio of additional seeds; its SiO 2 +MgO is a suspension of nanoparticles, and its concentration is 0.3g / L; the amount added is according to the ratio of titanyl sulfate solution volume ratio of 120:1;

[0028] Step 3: After the neutralization reaction, the temperature of the solution is raised to 90°C; the stability of the seed crystal is determined to be 100-130°C, and the seed crystal is quickly put into the preheated hydrol...

specific Embodiment 2

[0030] A preparation method of surface modified titanium dioxide, the main steps are the same as in Example 1, wherein K 3 PO 4 The concentration of the solution is 17g / L; SiO 2 +MgO suspension concentration is 0.25g / L. After the neutralization reaction, the hydrolysis of the titanium solution can obtain crystallization centers with uniform particle size, so that the particle size and particle size distribution of the final product titanium dioxide are uniform, and the final titanium dioxide has excellent quality.

specific Embodiment 3

[0031] A kind of preparation method of surface modified titanium dioxide, its concrete steps are as follows:

[0032] Step 1, the titanyl sulfate solution of 180g / L~210g / L (with TiO 2 Calculation) and K at a concentration of 15g / L 3 PO 4 solution, respectively heated to 75°C, and according to the volume ratio of 12:1, the titanyl sulfate solution was slowly added to K 3 PO 4 Neutralize in the solution, and control the flow rate to ensure that the reaction time is controlled at 12 minutes;

[0033] Step 2, add SiO at the same time 2 +MgO equal ratio of additional seeds; its SiO 2 +MgO is a suspension of nanoparticles, and its concentration is 0.2g / L; the amount added is according to the ratio of titanyl sulfate solution volume ratio 110:1;

[0034] Step 3: After the neutralization reaction, the temperature of the solution is raised to 95°C; the stability of the seed crystal is determined to be 100-130, and the seed crystal is quickly put into the preheated hydrolyzed tita...

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Abstract

The invention discloses a surface modified titanium dioxide preparation method which comprises a hydrolysis process which further comprises the following steps: respectively heating a 180-210g / L titanyl sulfate solution and a 10-20g / L K3PO4 solution to 70-80 DEG C, and carrying out a neutralization reaction for 10-15 minutes in a volume ratio of (10:1)-(15:1); at the same time adding a SiO2+MgO crystal seeds; neutralizing and heating to 90-100 DEG C for hydrolysis. The invention further provides titanium dioxide surface modification equipment which mainly comprises a crude product treatment device, a mixing device, a screening device, a modification device, a cleaning device, a drying machine, a crushing machine and a collector which are connected in sequence. The preparation method has the benefits that due to introduction of external crystal seeds, nucleation of TiO2 crystal seeds and granule dispersion are accelerated, a crystallization center of a uniform particle size is obtained,then the particle size and the particle size distribution of a final product, namely titanium dioxide, can be controlled, and excellent titanium dioxide can be obtained.

Description

technical field [0001] The invention belongs to the field of chemical pigments, and relates to the surface modification of titanium dioxide, and more specifically relates to a preparation method and equipment of surface-modified titanium dioxide. Background technique [0002] Titanium dioxide (also known as titanium dioxide) is the most widely used white chemical pigment in the modern chemical pigment industry. It has stable physical and chemical properties, as well as excellent optical and electrical properties. Therefore, it is widely used in architectural coatings, plastics, rubber, ink, paper, chemical fiber, ceramics, daily chemicals, medicine, food and other industries. The coating industry is the largest user of titanium dioxide, especially rutile titanium dioxide, most of which are consumed by industrial coatings. [0003] At present, the production of titanium dioxide mostly adopts sulfuric acid process. First, finely ground ilmenite and sulfuric acid are reacted ...

Claims

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Application Information

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IPC IPC(8): C01G23/053C01G23/047
CPCC01G23/0534C01G23/08
Inventor 陈满生张春华邓奕芳盛良兵卢伟红孙俊彬
Owner HENGYANG NORMAL UNIV
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