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A microwave-assisted method for preparing rutile titanium dioxide

A microwave-assisted, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve problems such as introduction, and achieve the effect of solving the induction effect, simple equipment and simple process

Active Publication Date: 2017-11-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the addition of transcrystal seeds can reduce the calcination temperature, it also introduces other impurities

Method used

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  • A microwave-assisted method for preparing rutile titanium dioxide
  • A microwave-assisted method for preparing rutile titanium dioxide
  • A microwave-assisted method for preparing rutile titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Take 50ml of industrial titanium solution or laboratory-made titanium solution with a titanium concentration of 160g / L, an iron-to-titanium ratio of 0.3, and an F value of 1.9, and place it in a three-necked flask. After the titanium solution is heated to 96°C, add 2 % of the seed crystals activated by 800W microwave radiation for 1 min, heat up to a boil after 10 min of heat preservation. Stop heating and stirring immediately when it turns gray, and after boiling for 30 minutes, start heating and stirring to raise the temperature to second boiling. After 3.5 hours of second boiling, the hydrolysis is completed, the slurry is filtered and washed, and the hydrolysis rate can reach 95.6%. The filter cake was first calcined at 500°C for 30 minutes, then heated to 700°C for 30 minutes, and then heated to 850°C for 30 minutes. XRD detected that the rutile content was 100%.

Embodiment 2

[0028] Example 2: Take 200mL of industrial titanium solution with a titanium solution concentration of 161g / L and an F value of 1.9 and place it in a three-necked flask. After the titanium solution is preheated to 96°C, add 2% of the titanium solution activated by 800W microwave radiation for 1min. Seed crystal (the source of the seed crystal is also industrial titanium liquid), after holding for 10 minutes, heat up to the first boiling, stop heating and stirring immediately when it turns gray, and after boiling for 30 minutes, start heating and stirring to raise the temperature to the second boiling, and the second boiling for 3.5 hours Finally, the hydrolysis is finished, the slurry is filtered and washed, and the hydrolysis rate can reach 94.1%. and press TiO 2 Add K to 0.4% of the content 2 O, 0.08% added P 2 o 5 , carry out salt treatment on it, the filter cake after salt treatment is firstly heated to 420°C for 30 minutes, then heated to 780°C for 60 minutes and held ...

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Abstract

The invention discloses a method for directly preparing rutile titanium dioxide by using low-concentration industrial titanium liquid through microwave-assisted preparation of external seed crystals. Microwave heating and activation is used to prepare seed crystals with high hydrolysis activity, and the seed crystals are used to hydrolyze industrial titanium liquid with external seed crystals to prepare metatitanic acid. The hydrolyzed metatitanic acid is calcined at a lower temperature to become rutile titanium dioxide. The advantage of the method adopted in the present invention is that the process method is simple, and low-concentration titanium liquid can be directly used for hydrolysis reaction, and there is no need to add rutile-type crystal seeds during the calcination process, and it is not necessary to calcine at high temperature for a long time to obtain rutile-type Titanium dioxide has very good industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide production, and in particular relates to a method for directly preparing rutile titanium dioxide by hydrolyzing low-concentration industrial titanium liquid with external seed crystals through microwave-assisted preparation. Background technique [0002] Titanium dioxide (scientific name titanium dioxide), with stable physical and chemical properties, excellent optical and electrical properties and superior pigment performance, is the most important white pigment, with high whiteness, strong decolorization power, good hiding power, dispersibility Good, non-toxic and harmless, it is widely used in coatings, paper making, ceramics, ink, chemical fiber and other fields. [0003] At present, commercial titanium dioxide production methods are mainly divided into sulfuric acid method and chlorination method, and the output ratio is about 35:65. In foreign countries, the chloride process is the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
Inventor 梁斌张耀文唐思扬袁绍军李春岳海荣刘长军王小梅
Owner SICHUAN UNIV