片状氧化铝的熔盐法制备关键参数  

Key parameters of preparing flake alumina by molten salt method

作　　者：张鹤 邵国强[2] 史和邦 吴昌梓 吴昊 陈敬波[1] 吕鹏鹏 ZHANG He;SHAO Guoqiang;SHI Hebang;WU Changzi;WU Hao;CHEN Jingbo;LYU Pengpeng(College of Materials and Metallurgy,Guizhou University,Guiyang 550025,Guizhou,China;Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;Ruicai Technology Co.,Ltd.,Yichun 336000,Jiangxi,China)

机构地区：[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

出　　处：《化工进展》2021年第8期4187-4195,共9页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(51764008)。

摘　　要：高径厚比片状Al_(2)O_(3)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Al_(2)O_(3)商用生产技术迫在眉睫。熔盐法是制备片状Al_(2)O_(3)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Al_(2)O_(3)影响规律的报道。本文通过片状Al_(2)O_(3)的形成机理,系统研究了TiO_(2)添加剂、Na_(3)P_(3)O_(9)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Al_(2)O_(3)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Al_(2)O_(3)的形貌、粒度和物相。结果表明:采用熔融盐(Na_(2)SO_(4)-K_(2)SO_(4))添加NaCO_(3)为凝胶剂,再加入质量分数分别为3.0%的Na_(3)P_(3)O_(9)和2.0%的TiO_(2)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Al_(2)O_(3)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。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 TiO_(2) additives,Na_(3)P_(3)O_(9) 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 Al_(2)O_(3).The results show that hexagonal flake alumina can be obtained with molten salt(Na_(2)SO_(4)-K_(2)SO_(4))and NaCO_(3) as gelling agent,3.0% Na_(3)P_(3)O_(9) and 2.0%TiO_(2) 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.

关 键 词：熔盐法 片状氧化铝 添加剂 煅烧温度 熔盐比 

分 类 号：TQ110.2[化学工程—无机化工]