Chemical Industry and Engineering Progress ›› 2021, Vol. 40 ›› Issue (8): 4187-4195.DOI: 10.16085/j.issn.1000-6613.2020-1864

• Chemical processes and equipment • Previous Articles     Next Articles

Key parameters of preparing flake alumina by molten salt method

ZHANG He1,2(), SHAO Guoqiang2(), SHI Hebang2, WU Changzi3, WU Hao3, CHEN Jingbo1(), LYU Pengpeng2()   

  1. 1.College of Materials and Metallurgy, Guizhou University, Guiyang 550025, Guizhou, China
    2.Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
    3.Ruicai Technology Co. , Ltd. , Yichun 336000, Jiangxi, China
  • Received:2020-09-14 Online:2021-08-12 Published:2021-08-05
  • Contact: CHEN Jingbo,LYU Pengpeng

片状氧化铝的熔盐法制备关键参数

张鹤1,2(), 邵国强2(), 史和邦2, 吴昌梓3, 吴昊3, 陈敬波1(), 吕鹏鹏2()   

  1. 1.贵州大学材料与冶金学院,贵州 贵阳 550025
    2.中国科学院过程工程研究所,北京 100190
    3.瑞彩科技股份 有限公司,江西 宜春 336000
  • 通讯作者: 陈敬波,吕鹏鹏
  • 作者简介:张鹤(1995—),男,硕士研究生,研究方向为流态化气相包覆新能源材料。E-mail:zhangheipe@163.com|邵国强(1986—),男,硕士,工程师,研究方向为流态化过程强化和矿产资源高效利用。E-mail:gqshao@ipe.ac.cn
  • 基金资助:
    国家自然科学基金(51764008)

Abstract:

Flake alumina with high aspect ratio has attracted great attentions as a high-end pearlescent pigment flake substrate. However, the preparation technology is controlled by other countries so that it is essential to develop new preparation method for flake alumina. The molten salt method is an ideal method for the flake alumina production. However, the systematic research of the key parameters of the method has not been reported. Based on the formation mechanism of flake alumina, this article systematically studies the influence of TiO2 additives, Na3P3O9 additives, calcination temperatures and molten salt dosages on the preparation of flake alumina. The scanning electron microscope and X-ray diffractometer are used to analyze the morphology, particle size and phase composition of flake Al2O3. The results show that hexagonal flake alumina can be obtained with molten salt (Na2SO4-K2SO4) and NaCO3 as gelling agent, 3.0% Na3P3O9 and 2.0% TiO2 as additives after calcination at 1200℃ for 5h. The final product possesses the average particle size of 4μm, the thickness of 50—200nm and the aspect ratio of 20—80.

Key words: molten salt method, flake alumina, additive, calcination temperature, molten salt ratio

摘要:

高径厚比片状Al2O3在高端珠光颜料片状基材应用方面潜力巨大,但是其制备技术为国外所垄断,开发片状Al2O3商用生产技术迫在眉睫。熔盐法是制备片状Al2O3的理想方法,目前尚无系统研究熔盐法关键工艺参数对片状Al2O3影响规律的报道。本文通过片状Al2O3的形成机理,系统研究了TiO2添加剂、Na3P3O9添加剂、煅烧温度和熔盐用量4种关键工艺参数对制备片状Al2O3的影响规律,并进一步优化制备工艺,提出最优工艺参数。利用扫描电子显微镜和X射线衍射仪分析Al2O3的形貌、粒度和物相。结果表明:采用熔融盐(Na2SO4-K2SO4)添加NaCO3为凝胶剂,再加入质量分数分别为3.0%的Na3P3O9和2.0%的TiO2为添加剂,在煅烧温度为1200℃、保温时间5h时,所制得的六角片状Al2O3粉体具有优异的品质,其平均粒径约为4μm,厚度为50~200nm,径厚比为20~80。

关键词: 熔盐法, 片状氧化铝, 添加剂, 煅烧温度, 熔盐比

CLC Number: 

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