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过程工程学报 ›› 2017, Vol. 17 ›› Issue (5): 1078-1084.DOI: 10.12034/j.issn.1009-606X.217130CSTR: 32067.14.jproeng.217130

• 材料工程 • 上一篇    下一篇

非晶晶化法制备钛酸钠及其晶型转变规律

彭 艳1,2， 王 志1*，王 东1， 公旭中1，曹建尉1， 齐 涛1     

  1. 1. 中国科学院过程工程研究所绿色过程与工程重点实验室，湿法冶金清洁生产技术国家工程实验室，北京 100190； 2. 中国科学院大学化学与化工学院，北京 100049
  • 收稿日期:2017-02-13 修回日期:2017-03-06 出版日期:2017-10-20 发布日期:2017-10-10
  • 通讯作者: 王志 zwang@ipe.ac.cn
  • 基金资助:
    微观结构调控强化钛酸盐电化学解离的基础研究;高效结晶增值冶金

Synthesis of Sodium Titanate by Crystallization of Amorphous Phase and Crystalline Structure Transition

Yan PENG1,2,  Zhi WANG1*,  Dong WANG1,  Xuzhong GONG1,  Jianwei CAO1,  Tao QI1     

  1. 1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, CAS, Beijing 100190, China; 2. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-02-13 Revised:2017-03-06 Online:2017-10-20 Published:2017-10-10

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摘要： 以TiO2和Na2CO3为原料，在1200℃下保温1 h熔融水淬制备非晶态钛酸钠，通过晶化制备不同晶型的钛酸钠晶体，研究了非晶态析晶过程及晶型转变规律. 结果表明，626℃下不保温合成了单一晶型Na2TiO3, 811℃下保温120 min合成了单一晶型Na16Ti10O28, 897℃下不保温、保温30和120 min分别合成了单一晶型Na16Ti10O28, Na2TiO3和Na2Ti3O7，拟合得626, 811和897℃时钛酸钠的平均结晶度分别为45.2%, 43.8%和86.6%. 升温过程中非晶态钛酸钠逐渐析出Na2TiO3晶体，随晶化时间延长，626℃下Na2TiO3逐渐向Na16Ti10O28和Na4Ti5O12转变，811℃下Na4Ti5O12向Na16Ti10O28转变，897℃下Na16Ti10O28转变为Na2Ti3O7.

关键词: 钛酸钠, 非晶晶化法, 结晶度, 晶型转变

Abstract: The method of crystallization of amorphous phase was applied to synthesize the different sodium titanate and the rules of crystalline structure transition to find the ways to synthesize different sodium titanates with single-phase and high crystallinity was studied. The crystallization of amorphous phase contains two parts, namely preparing amorphous phase and its crystallization. Preparation of amorphous sodium titanate is obtained by sintering TiO2 and Na2CO3 at 1200℃ for 1 h and then water-quenching. Crystallization of amorphous phase is carried out to synthesize sodium titanate by controlling the temperature, holding time and heating program. The results showed that single-phase Na2TiO3 and Na16Ti10O28 can be synthesize at 626℃ for 0 min and 811℃ for 120 min, respectively. The single-phase Na16Ti10O28, Na2TiO3, Na2Ti3O7 were synthesized at 897℃ for 0, 30 and 120 min, respectively. The average crystallinity at 626, 811 and 897℃ were 45.2%, 43.8% and 86.6%, respectively. In addition, it is found that gradual transition happens from amorphous phase to Na2TiO3 during the heating process, then transition happens from Na2TiO3 to Na4Ti5O12 at 626℃, further transits to Na16Ti10O28 at 811℃ and transits to Na2Ti3O7 at 897℃.

Key words: sodium titanate, crystallization of amorphous phase, crystallinity, crystalline structure transition