Synthesis of high purity TiO<sub>2</sub> powders by fluidized gas hydrolysis

ZHAO Yuzhong; SUN Jianjun; LI Jun; ZHU Qingshan

doi:10.11949/j.issn.0438-1157.20170515

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Synthesis of high purity TiO₂ powders by fluidized gas hydrolysis

更新时间：2025-12-10

- Synthesis of high purity TiO₂ powders by fluidized gas hydrolysis
- CIESC Journal Issue 10, Pages: 3978-3984(2017)
- 作者机构：
  
  1. 中国科学院过程工程研究所, 多相复杂系统国家重点实验室,北京,100190
  2. 北京化工大学化学工程学院,北京,100029
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20170515
  CLC： Q031.5
- Online First：05 October 2017，
  
  Published：05 October 2017
- 稿件说明：
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ZHAO Yuzhong, SUN Jianjun, LI Jun, et al. Synthesis of high purity TiO₂ powders by fluidized gas hydrolysis[J]. CIESC Journal, 2017, (10): 3978-3984. DOI: 10.11949/j.issn.0438-1157.20170515.
DOI：

ZHAO Yuzhong, SUN Jianjun, LI Jun, et al. Synthesis of high purity TiO₂ powders by fluidized gas hydrolysis[J]. CIESC Journal, 2017, (10): 3978-3984. DOI: 10.11949/j.issn.0438-1157.20170515. DOI：

摘要

针对TiCl4气相水解制备TiO2粉体存在Cl含量高的问题，开展了流化床TiCl4气相水解制备高纯TiO2。系统地研究了反应条件、煅烧后处理对TiO2粉体的纯度、形貌、晶型、比表面积的影响。结果表明，TiO2内部结构和晶型的转变有利于Cl的脱除；提高煅烧温度使TiO2的内部结构由多孔疏松向致密结构转变，晶型结构由锐钛矿相向金红石相转变，从而有利于提高Cl的脱除率；与空气煅烧比较，水蒸气气氛下的脱氯效率明显提高，归因于水蒸气与TiO2颗粒内残余的多羟基氯化物进一步反应；氢气气氛下可进一步提高Cl的脱除率，800℃煅烧2 h后Cl的脱除率达到95%，主要归因于氢气还原TiO2使其晶型结构发生转变。

Abstract

Synthesis of high purity TiO2 powder by fluidized gas hydrolysis method is investigated.To tackle the problem of high Cl content remained in the TiO2 powder

the hydrolysis reaction conditions and subsequently calcination at air

steam and H2 are mainly investigated for dechlorination.The results show that the structure and phase transition of TiO2 are two key factors that affect the efficiency of dechlorination.With the increase of the calcination temperature

the internal structure of TiO2 is changed from porous to dense structure

and the crystalline structure is transformed from anatase to rutile.The structure and phase transition of TiO2 are beneficial to increasing the removal rate of Cl.Compared with the air calcination

the dechlorination efficiency in water vapor atmosphere is obviously improved

which is attributed to the further reaction of water vapor and the multi hydroxyl chloride in the TiO2 particles.Compared with air and steam calcination

the removal rate of Cl can be further improved up to 95% under the atmosphere of hydrogen at 800℃ for 2h

which is mainly attributed to the reduction of TiO2 structure by hydrogen reduction.

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Synthesis of high purity TiO2 powders by fluidized gas hydrolysis

DOI：10.11949/j.issn.0438-1157.20170515

摘要

Abstract

关键词

Keywords

references

Synthesis of high purity TiO₂ powders by fluidized gas hydrolysis