Process for preparing rutile-type nano TiO2

A nano-titanium dioxide and gold preparation technology, applied in the nano field, can solve the problems of inability to produce rutile-type nano-titanium dioxide, low rutile crystal form conversion rate, unstable shape rules, etc., and achieve easy control, improve crystal form conversion rate and particle size. uniform effect

Inactive Publication Date: 2002-04-10
济南裕兴化工总厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are complex process, high cost, low conversion rate of rutile crystal form, uneven particle size, unstable shape, etc.
This method is only suitable for producing anatase nano-titanium dioxide, and cannot produce rutile nano-titanium dioxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. To Fe 2+ / TiO 2 =0.3, tetravalent titanium content is 150 g / liter of tetravalent titanium solution, add the lye that concentration is 4 and stability is the seed crystal of 70 milliliters of water / 10 milliliters, and the addition is respectively 18% of tetravalent titanium solution , 0.8% (all by weight); heated to 70°C at a heating rate of 2°C / min under normal pressure, thermally hydrolyzed for 4 hours to form metatitanic acid with a particle size of about 30 nanometers, and then washed with water once , Trivalent titanium bleaching, secondary washing to remove soluble impurities in metatitanic acid, control the iron content in metatitanic acid to be less than 80PPM, and then

[0015] 2. Re-beat the metatitanic acid that has passed the water washing with ion-free water, adjust the pH value to 7.0 with sodium hydroxide, select the slurry with the required particle size through static precipitation, and then perform solid-liquid separation, and then use ion-free Was...

Embodiment 2

[0021] 1. To Fe 2+ / TiO 2 =0.2, tetravalent titanium content is 280 g / liter of tetravalent titanium solution, adding concentration is lye of 17 and stability is the seed crystal of 270 milliliters of water / 10 milliliters, and the addition is respectively 7% of tetravalent titanium solution , 4% (both by weight); heated to 90°C with a heating rate of 3°C / min under normal pressure, thermally hydrolyzed for 5 hours to form metatitanic acid with a particle size of about 60 nanometers, and then washed with water once , trivalent titanium floating, secondary washing to remove soluble impurities in metatitanic acid, control the iron content in metatitanic acid to be less than 80PPM, and then

[0022] 2. Re-beat the metatitanic acid that has passed the water washing with ion-free water, adjust the pH value to 8.0 with sodium hydroxide, select the slurry with the required particle size through static precipitation, and then carry out solid-liquid separation, and then use ion-free Was...

Embodiment 3

[0027] 1. To Fe 2+ / TiO 2 =0.4, tetravalent titanium content is that adding concentration is 10% (weight) in the tetravalent titanium liquid of 80 g / liter, and the addition is 10% (weight) of tetravalent titanium liquid; The heating rate is heated to 80°C, and after 4 hours of thermal hydrolysis, the metatitanic acid with a particle size of about 70 nanometers is formed, and then the soluble impurities in the metatitanic acid are removed through a water wash, trivalent titanium bleaching, and a second water wash to control the partial titanic acid. Iron content in titanate is less than 80PPM, then

[0028] 2. Re-beat the metatitanic acid that has passed the water washing with ion-free water, adjust the pH to 9.0 with sodium hydroxide, select the slurry with the required particle size through static precipitation, and then carry out solid-liquid separation, and then use ion-free Wash the filter cake with water until the filtrate does not contain sulfate radicals, then

[002...

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Abstract

A rutile-type nm TiO2 is prepared from 4-valence Ti liquid whose Fe/TiO2 is 0.10-0.40 through hydrolysis by adding diluted alkali solution and crystal seeds in the said 4-valence Ti liquid, selectiveseparation, washing, dispersing, adding rutile crystal promoter, and calcine.

Description

technical field [0001] The invention belongs to the field of nanotechnology, and more specifically relates to a production method of nano titanium dioxide powder. Background technique [0002] Nano-titanium dioxide is widely used in many technical fields. At present, sol-gel method is widely used at home and abroad for preparation, that is, n-butyl titanate is used as raw material, and the quality of nano-titanium dioxide prepared is good, and the particle size can reach more than ten nanometers, but at a higher cost. In addition, the uniform precipitation method is adopted, that is, metatitanic acid is used as a raw material, and urea is used as a uniform precipitant for reaction, precipitation, calcining, and crushing to obtain finished products. The particle size of the produced nano-titanium dioxide is generally 50 nanometers, but due to In the prior art, the particle size of the hydrolyzed metatitanic acid is relatively large, and chemical methods need to be used to di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36
Inventor 武军李卫国吴兆栋陈宽济
Owner 济南裕兴化工总厂
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