SB粉分解铝酸钠溶液制备拟薄水铝石机理的初步研究
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- 英文论文题名：Study on Mechanism of SB Pseudoboehmite Seeded Precipitation from Sodium Aluminate Solution
- 论文作者：蔡卫权 ; 胡玉珍 ; 吴选军
- 英文论文作者：Cai Wei-Quan ; HU Yu-Zhen ; Wu Xuan-Jun ; Department of Chemistry ; School of Chemistry ; Chemical Engineering and Life Sciences ; Wuhan University of Technology ; State Key Laboratory of Silicate Materials for Architectures ; Wuhan University of Technology
- 年：2016
- 作者机构：武汉理工大学化学化工与生命科学学院;武汉理工大学硅酸盐建筑材料国家重点实验室;
- 论文关键词：铝酸钠溶液 ; SB粉 ; 水热分解 ; 拟薄水铝石 ; 机理
- 英文论文关键词：Sodium aluminate solution ; SB pseudoboehmite ; Hydrothermal seed precipitation ; Pseudoboehmite ; Mechanism
- 会议召开时间：2016-09-23
- 会议录名称：中部四省化学化工学会2016年学术年会摘要集
- 语种：中文
- 分类号：TQ133.1
- 学会代码：JXHX
- 会议名称：中部四省化学化工学会2016年学术年会
- 会议地点：中国江西南昌
- 主办单位：中国化学会湖北代表处
- 学会名称：江西省化学化工学会
- 页数：1
- 文件大小：115k
- 原文格式：D
- 会议级别：地方
摘要
运用ICP-OES、XRD、TEM和N_2吸附-脱附等测试方法和表征手段,研究了以SB粉为晶种,从铝酸钠溶液析出单相拟薄水铝石的条件及其对分解产物性质的影响。研究表明,铝酸钠溶液在373 K下水热分解16 h以上,或在398 K下水热分解3 h以上,均可以得到拟薄水铝石;常压回流时因伴有三水铝石、诺水铝石和一水硬铝石等副产物的析出,不适合用做铝酸钠溶液晶种分解制备拟薄水铝石的条件。水热条件下拟薄水铝石的析出是一个动力学抑制过程,表现为快速析出阶段、类表观析出平衡阶段和缓慢析出阶段共三个阶段,还讨论了强化拟薄水铝石高效析出的措施。
Precipitation conditions of single-phase pseudoboehmite from supersaturated sodium aluminate(SA) solution and effects of them on properties of precipitated products with SB pseudoboehmite seed were studied by ICP-OES,XRD,TEM and N_2 adsorption.It was found that single-phase pseudoboehmite can be obtained under hydrothermal conditions at 373 K over 16 hours or at 398 K less than 3 hours.However,the SB seeded precipitation under circulation reflux at approximate 0.1MPa was not suitable for preparing pseudoboehmite because of by-products formation,such as gibbsite,nordstrandite,diaspore,etc.The pseudoboehmite hydrothermal precipitation is a dynamic inhibited process which approximately consists of three stages,namely a fast precipitation stage,an analogously apparent equilibrium stage and a slow precipitation stage.The intensified measures to precipitate pseudoboehmite efficiently were also discussed.
Precipitation conditions of single-phase pseudoboehmite from supersaturated sodium aluminate(SA) solution and effects of them on properties of precipitated products with SB pseudoboehmite seed were studied by ICP-OES,XRD,TEM and N_2 adsorption.It was found that single-phase pseudoboehmite can be obtained under hydrothermal conditions at 373 K over 16 hours or at 398 K less than 3 hours.However,the SB seeded precipitation under circulation reflux at approximate 0.1MPa was not suitable for preparing pseudoboehmite because of by-products formation,such as gibbsite,nordstrandite,diaspore,etc.The pseudoboehmite hydrothermal precipitation is a dynamic inhibited process which approximately consists of three stages,namely a fast precipitation stage,an analogously apparent equilibrium stage and a slow precipitation stage.The intensified measures to precipitate pseudoboehmite efficiently were also discussed.
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