文献类型：期刊文献

中文题名：煅烧晶种和磷、镁对二氧化钛晶体的影响

英文题名：Effects of calcining seed,phosphate,and magnesium on titanium dioxide crystal

作者：容尔益[1];朱家文[1];陈葵[1];姚恒平[2];周晓葵[2]

机构：[1]华东理工大学化工学院,上海200237;[2]四川龙蟒钛业股份有限公司

年份：2016

卷号：48

期号：7

起止页码：21

中文期刊名：无机盐工业

外文期刊名：Inorganic Chemicals Industry

收录：CSTPCD;;北大核心:【北大核心2014】；

基金：上海市科委资助项目(15195800700);四川省科技厅资助项目(2014PT029)

语种：中文

中文关键词：偏钛酸;煅烧;晶型转化;晶粒大小

外文关键词：metatitanic acid; calcinations; phase transformation; crystalline size

摘要：以硫酸法钛白工艺生产的偏钛酸为原料,经过漂白、二洗、盐处理和煅烧过程制备了金红石二氧化钛,并利用X射线衍射仪分析晶体结构,系统性地研究煅烧晶种和掺杂磷、镁对煅烧过程中二氧化钛晶粒大小和晶型转化的影响。结果表明,煅烧晶种和掺杂镁可以促进晶型转化,晶种对二氧化钛晶粒大小影响较小,镁则可以显著促进晶粒生长;在850℃下,随着晶种添加量的增加,金红石转化率从29.28%提高到33.79%;随着氧化镁含量的增加,金红石转化率则从35.09%提高到73.17%。与此同时,掺杂磷抑制了二氧化钛的晶粒生长和晶型转化;随着五氧化二磷添加量的增加,在890℃下,金红石转化率从97.44%下降到7.99%,晶粒大小从67.91 nm减小至47.86 nm。
Rutile TiO_2 has been prepared using metatitanic acid from TiO_2 production with sulfuric acid process as the raw material,after bleaching,secondary washing,salt treatment,and calcinations.The crystal structure of the as-prepared sample was analyzed by XRD.The effects of calcining seed,phosphate,and magnesium doping on the crystalline size and anataserutile phase transformation of TiO_2 in calcination process were systematically investigated.Results showed that,the phase transformation was promoted by introducing calcining seed and magnesium; calcining seed had minor impact on the crystalline size,but magnesium can significantly promote the growth of crystal;at 850 ℃,with the increase of addition of calcining seed,rutile ratio increased from 29.28% to 33.79%;with the increase of content of Mg O,rutile ratio increased from 35.09% to73.17%.At the same time,P_2O_5 inhibited the phase transformation and the crystalline size;at 890 ℃,with the increase of P_2O_5,the rutile phase transformation decreased from 97.44% to 7.99%,and the crystalline size reduced from 67.91 nm to 47.86 nm