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Production process for improving properties of anatase titanium dioxide

Anatase titanium dioxide and production process technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of limited performance improvement, increase in calcination strength, and decrease in calcination strength of anatase titanium dioxide, so as to achieve saving Effects of treatment cost, lower calcination temperature, and shorter time

Inactive Publication Date: 2019-01-08
LOMON BILLIONS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the improvement of product performance by salt treatment is relatively limited, and may also increase the calcination strength
[0012] At present, there is no technology to improve the performance of anatase titanium dioxide by reducing the sulfur content in the filter cake before the kiln to reduce the calcination strength

Method used

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  • Production process for improving properties of anatase titanium dioxide
  • Production process for improving properties of anatase titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Take the qualified metatitanic acid slurry for bleaching and washing, and adjust the TiO 2 The content is 245g / L, the temperature is raised to 60°C, the pH is adjusted to 7.0 with ammonia water, and matured for 2 hours;

[0035] (2) After suction filtration and neutralization, the slurry was obtained to obtain a filter cake, and then washed with deionized water for 40 minutes, and the filter cake was beaten to make TiO 2 The content is 253g / L;

[0036] (3) Add potassium hydroxide and phosphoric acid for salt treatment, and then filter with suction to ensure that K in the base material after calcination 2 O content is 0.20%, P 2 o 5 The content is 0.30%;

[0037] (4) The filter cake is calcined in a rotary kiln, and the decolorizing power of 100 is used as the qualified standard for calcining the material, and the sulfur content of the tail gas is tested with a tail gas analyzer.

[0038] (5) Crushing, testing the whiteness and blackening (Reynolds value) of the...

Embodiment 2

[0040] (1) Take the qualified metatitanic acid slurry for bleaching and washing, and adjust the TiO 2 The content is 228g / L, the temperature is raised to 70°C, the pH of the slurry is adjusted to 6.7 with ammonia water, and it is matured for 1.5h;

[0041] (2) After suction filtration and neutralization, the slurry was obtained to obtain a filter cake, and then washed with deionized water for 25 minutes, and the filter cake was beaten to make TiO 2 The content is 263g / L;

[0042] (3) Add potassium hydroxide, phosphoric acid and zinc chloride for salt treatment, and then filter with suction to ensure that K in the base material after calcination 2 O content is 0.20%, P 2 o 5 The content is 0.30%;

[0043] (4) The filter cake is calcined in a rotary kiln, and the decolorizing power of 100 is used as the qualified standard for calcining the material, and the sulfur content of the tail gas is tested with a tail gas analyzer.

[0044] (5) Crushing, testing the whiteness and bl...

Embodiment 3

[0046] (1) Take the qualified metatitanic acid slurry for bleaching and washing, in which TiO 2 The content is 219g / L, the temperature is raised to 80°C, the pH of the slurry is adjusted to 6.0 with ammonia water, and the aging is 0.5h;

[0047] (2) After suction filtration and neutralization, the slurry was obtained to obtain a filter cake, and then washed with deionized water for 15 minutes, and the filter cake was beaten to make TiO 2 The content is 268g / L;

[0048] (3) Add potassium hydroxide, phosphoric acid and zinc chloride for salt treatment, and then filter with suction to ensure that K in the base material after calcination 2 O content is 0.20%, P 2 o 5 The content is 0.30%;

[0049] (4) The filter cake is calcined in a rotary kiln, and the decolorizing power of 100 is used as the qualified standard for calcining the material, and the sulfur content of the tail gas is tested with a tail gas analyzer.

[0050] (5) Crushing, testing the whiteness and blackening (R...

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Abstract

The invention relates to a production process for improving properties of anatase titanium dioxide. The production process comprises steps of ammonium hydroxide neutralization, water washing, pulping,salt treatment, calcining, and the like. By adopting the production process, a calcining temperature can be effectively reduced by about 40 DEG C, the calcining temperature can be reduced, the time can be shortened, a tail gas is low in sulfur and can meet emission standards, the tail gas treatment cost can be reduced, environment pollution can be reduced, sintering situations of a material can be improved to a large extent, the materials can be loosened and soft and easy to grind, the whiteness and the Ranolds value of a finished product can be increased, and increase of the Ranolds value isbeneficial to improvement of covering performance of the material; and meanwhile, neutralized filtrate can be treated in a special membrane treatment mode of the company to recycle ammonium sulfate,water can be further recycled and reused, and thus environment pollution caused by unqualified ammonia nitrogen contents can be avoided.

Description

technical field [0001] The invention relates to a production process for improving the performance of anatase titanium dioxide, which belongs to the field of chemical metallurgy. Background technique [0002] Titanium dioxide is widely used in the fields of coatings, plastics, paper and inks due to its excellent whiteness, hiding power, weather resistance and chemical stability. In nature, titanium dioxide is mainly divided into three crystal forms: brookite, anatase and rutile. Brookite has no industrial application value due to its unstable crystal form, while both anatase and rutile have stable crystal lattices and have become important white pigments and are widely used. [0003] The production process of anatase titanium dioxide usually includes: [0004] (1) Acid hydrolysis: acid hydrolysis reaction with titanium concentrate or acid-soluble waste residue and sulfuric acid to obtain titanyl sulfate; [0005] (2) Hydrolysis, hydrolyzing titanyl sulfate to obtain metat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
CPCC01G23/053C01P2006/62C01P2006/64
Inventor 陈建立肖莎莎冯娜孙亮刘晓洁张曼
Owner LOMON BILLIONS GRP CO LTD
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