摘要
以建筑垃圾为主要原料,Al2O3为铝源,AlF3为晶须催化剂,MoO3为烧结助剂,成功制备了钙长石-莫来石-刚玉多孔陶瓷。采用XRD和SEM分析了多孔陶瓷材料的物相组成及形貌,研究了在烧结温度1350℃条件下,不同保温时间对多孔陶瓷材料开口孔隙率、孔径分布的影响,以及钙长石-莫来石-刚玉多孔陶瓷的双轴弯曲强度和油水分离性能。结果表明,当AlF3含量为12%(质量分数)、MoO3含量为4%(质量分数)时,在烧结温度1350℃下,保温2 h,制备的钙长石-莫来石-刚玉多孔陶瓷性能最优。孔隙率分析可知,保温时间为2 h时,有利于原料中氧化铝相和玻璃相莫来石化,增加莫来石相的含量;此时多孔陶瓷材料具有46%的开口孔隙率,且样品中莫来石晶须的大量生长造成晶须之间的尺寸较为一致,使得样品的开孔孔隙孔径大小比较集中,比较适合进行油水分离。力学性能分析表明,保温时间为2 h时,样品的双轴弯曲强度为68 MPa,机械性能良好。油水分离性能研究表明,在不同的膜压差下,样品的油乳拦截率均能达到97%~99%,多孔陶瓷膜具有较好的油乳分离性能。
Porous calcareous feldspar-mullite-corundum ceramics were successfully prepared with construction waste as main raw material,Al2O3 as aluminium source,AlF3 as whisker catalyst and MoO3 as sintering aids.The phase composition and morphology of porous ceramics were analyzed by XRD and SEM.The effects of different holding time on the open porosity and pore size distribution of porous ceramics at 1350℃were studied.The biaxial bending strength and oil-water separation properties of calcium feldspar-mullite-corundum porous ceramics were also studied.The results showed that when the content of AlF3 was 12wt%and MoO3 was 4wt%,the porous calcium feldspar-mullite-corundum ceramics had the best properties when the sintering temperature was 1350℃and the sintering temperature was 2 h.Porosity analysis showed that holding time of 2 h was beneficial to mullitization of alumina phase and glass phase in raw materials and increasing the content of mullite phase.At this time,porous ceramics materials had 46%open porosity,and the large growth of mullite whiskers in samples caused the size of whiskers to be more uniform,which made the opening of samples more uniform.The pore size was relatively concentrated,which was suitable for oil-water separation.Mechanical properties analysis showed that the biaxial bending strength was 68 MPa and the mechanical properties were good when holding time was 2 h.The oil-water separation performance study showed that the oil-emulsion interception rate of the samples could reach 97%-99%under different membrane pressure difference.Porous ceramic membranes had good oil-emulsion separation performance.
作者
张晓华
邢家悦
ZHANG Xiaohua;XING Jiayue(School of Civil Engineering and Water Conservancy, Ningxia University, Yinchuan 750021, China;Center of Engineering Research on Efficient Utilization of Water Resources in Modern Agricultural in Arid Regions, Yinchuan 750021,China;School of Civil Engineering,Sichuan Agricultural University,Dujiangyan 611830, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2019年第12期12172-12177,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51768058)
自治区自然基金资助项目(NZ17006)
关键词
建筑垃圾
莫来石
多孔陶瓷
孔隙率
油水分离性能
construction waste
mullite
porous ceramics
porosity
oil-water separation performance
