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Method for preparing nano titanium dioxide in anatase type from fluid of hydrothermal crystallized titanium sulfate

A nano-anatase and titanium dioxide technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of expensive raw materials and achieve the effects of easy raw materials, reduced environmental pollution, and stable performance

Inactive Publication Date: 2003-05-07
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 1999, DuPont of the United States applied for the hydrothermal preparation of nano-TiO using special titanium ammonium oxalate as raw material. 2 patent (US5,973,175), but the raw materials are still expensive

Method used

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  • Method for preparing nano titanium dioxide in anatase type from fluid of hydrothermal crystallized titanium sulfate
  • Method for preparing nano titanium dioxide in anatase type from fluid of hydrothermal crystallized titanium sulfate
  • Method for preparing nano titanium dioxide in anatase type from fluid of hydrothermal crystallized titanium sulfate

Examples

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Effect test

Embodiment 1

[0018] Example 1: The titanium liquid was precrystallized by hydrothermal treatment at 100°C and 120°C for 5 hours, washed with water to obtain a precipitate, and the precipitate was calcined at 350°C for 5 hours to obtain crystallized, dispersible, nano-sharp Ilmenite-type titanium dioxide products TiA1, TiB1 ( figure 2 ).

Embodiment 2

[0019] Example 2: The titanium solution was precrystallized by hydrothermal treatment at 100°C and 120°C for 5 hours respectively, and washed with water to obtain precipitate A, which was treated with 1.0ml of 0.2M dilute acetic acid per gram of precipitate for 2 hours and then washed with water , to obtain precipitate B, and then each gram of precipitate was treated with 1.0ml 0.2M ammonia water for 2 hours, washed with water to obtain precipitate C, and then per gram of precipitate was treated with 1.0ml 0.1% polyvinylamide for 2 hours to obtain precipitate D. After precipitation D was washed with water and separated, it was calcined at 800°C for 5 hours to obtain crystallized and dispersible nano anatase titanium dioxide TiA6 and TiB6 ( figure 1 a. image 3 a).

Embodiment 3

[0020] Example 3: The titanium solution was precrystallized by hydrothermal treatment at 100°C and 120°C for 5 hours respectively, and washed with water to obtain precipitate A, which was treated with 1.0ml of 0.2M dilute hydrochloric acid per gram of precipitate for 2 hours and then washed with water , to obtain precipitate B; then washed with water, to obtain precipitate C. After the precipitate C was washed with water and separated, it was calcined at 800°C for 5 hours to obtain crystallized, dispersible, nano anatase titanium dioxide TiA9, TiB9 ( figure 1 b. image 3 b).

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Abstract

A process for preparing nano anatase-type TiO2 from the solution of titanium sulfate by hydrothermal crystallizing includes such steps as hydrothermal precrystallizing at 80-150 deg.C, and sintering at 350-800 deg.C. Its advantages are high dispersity and stability, low cost and less environmental pollution.

Description

technical field [0001] The invention relates to a new process for preparing nano titanium dioxide by using industrial titanium sulfate solution. Background technique [0002] TiO 2 Commonly known as titanium dioxide, there are mainly two commercial types: rutile type and anatase type. In industry, the sulfuric acid method is mainly used to produce anatase TiO 2 . The main issue affecting the product is that TiO 2 The shape and particle size are difficult to control, and calcination will lead to particle agglomeration, growth and uneven particle size distribution, and it is difficult to prepare nano-sized TiO 2 ; Simultaneously due to high temperature phase change, the phase is difficult to control. The currently reported raw materials for the preparation of nano-TiO2 by hydrothermal method are usually expensive alkoxides, which limits the commercial acceptance. In 1992, the British Titanium Industry (Tioxide Group) announced the prepar...

Claims

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Application Information

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IPC IPC(8): C01B13/18C01B13/36C01G23/047C01G23/053C01G23/08
Inventor 吴明娒吴昊黄爱红林钢
Owner SUN YAT SEN UNIV
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