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A bleaching method for producing metatitanic acid in titanium dioxide by sulfuric acid method

A technology of metatitanic acid and titanium dioxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of poor pigment performance and poor bleaching effect of the product, and achieve strong decolorization, good whiteness, and good bleaching effect Effect

Active Publication Date: 2017-08-01
中钛集团焦作市裕盛钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the bleaching effect of this method is relatively poor, and the product pigment property that makes simultaneously is relatively poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. Take the qualified metatitanic acid (using TiO 2 Total) 180g, 5.4g of rutile calcined seed crystals, add to the reaction pot, add water and stir evenly, and obtain the concentration of metatitanic acid (based on TiO 2 Meter) is the slurry of 180g / L.

[0045] 2. At a stirring rate of 90 r / min, the slurry is heated to 40° C. at a heating rate of 2° C. / min.

[0046] 3. Take 1.44g of zinc sulfite and add it into the slurry, and react at 40°C for 40min.

[0047] 4. After the reaction is over, the slurry is filtered by a vacuum negative pressure leaf filter, and the filter cake is washed with deionized water.

[0048] 5. Add 1.26 g of potassium carbonate to the filter cake, send it to the calcining and crushing process through a horizontal screw conveyor, and obtain the titanium dioxide product after calcining and crushing.

[0049] 6. Carry out pigment performance test on the product, Fe 2 o 3 Content detection, sample number 1, the results are shown in Table 1 and T...

Embodiment 2

[0051] 1. Take the qualified metatitanic acid (using TiO 2 total) 185g, 7.4g of rutile calcined seed crystals were added to the reaction pot, water was added, and the ultrasonic dispersion was uniform to obtain the concentration of metatitanic acid (based on TiO 2 Meter) is the slurry of 185g / L.

[0052] 2. At a stirring rate of 80 r / min, the slurry is heated to 50° C. at a heating rate of 3° C. / min.

[0053] 3. Take 1.85g of zinc sulfite and add it into the slurry, and react at 50°C for 44min.

[0054] 4. After the reaction is over, the slurry is filtered through a drum vacuum filter, and the filter cake is washed with deionized water.

[0055] 5. Add 1.11 g of potassium carbonate to the filter cake, send it to the calcining and crushing process through a horizontal screw conveyor, and obtain the titanium dioxide product after calcining and crushing.

[0056] 6. Carry out pigment performance test on the product, Fe 2 o 3 Content detection, sample number 2, the results ar...

Embodiment 3

[0058] 1. Take the qualified metatitanic acid (using TiO 2 total) 200g, 5g of rutile calcined seed crystals were added to the reaction pot, water was added, and the ultrasonic dispersion was uniform to obtain the concentration of metatitanic acid (based on TiO 2 Meter) is the slurry of 200g / L.

[0059] 2. At a stirring rate of 100 r / min, the slurry is heated to 46° C. at a heating rate of 4° C. / min.

[0060] 3. Add 3 g of zinc sulfite to the slurry, and react at 46°C for 50 minutes.

[0061] 4. After the reaction is over, the slurry is filtered by a vacuum negative pressure leaf filter, and the filter cake is washed with deionized water.

[0062] 5. Add 2 g of potassium sulfate to the filter cake, send it to the calcining and crushing process through a horizontal screw conveyor, and obtain the titanium dioxide product after calcining and crushing.

[0063] 6. Carry out pigment performance test on the product, Fe 2 o 3 Content detection, sample number 3, the results are sh...

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Abstract

The invention relates to a bleaching method for metatitanic acid in production of titanium dioxide by sulfuric acid process. The method includes: subjecting hydrolysis prepared metatitanic acid and rutile calcined seed crystals to pulping, adding zinc sulfite, performing filtering and washing, then adding a potassium salt, and sending the mixture into a calcining and grinding process. The bleaching method for metatitanic acid in production of titanium dioxide by sulfuric acid process provided by the invention has no need for additional adding of sulfuric acid and has good bleaching effect, and the prepared product has good pigment performance.

Description

technical field [0001] The invention relates to the field of titanium dioxide production, in particular to a bleaching method for producing metatitanic acid in titanium dioxide by a sulfuric acid method. Background technique [0002] Titanium dioxide is an important inorganic chemical raw material with stable physical and chemical properties, excellent optical and electrical properties, and excellent pigment properties. It is widely used in coatings, paper, plastics, inks, rubber, cosmetics, ceramics, electronics, etc. Wide range of applications. Titanium dioxide (titanium dioxide) has three crystallizations in nature: brookite, anatase and rutile, of which the brookite is an unstable crystal form and has no industrial value, while the photochemical stability of rutile titanium dioxide, gloss refraction The rate is better than that of anatase titanium dioxide, which makes it larger than anatase titanium dioxide in application field and demand. [0003] In the current domes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
CPCC01G23/053
Inventor 徐春长
Owner 中钛集团焦作市裕盛钛业有限公司
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