基于粉煤灰高效催化的莫来石多孔陶瓷孔结构构筑与分离性能  

Construction and Filtration Performance of Mullite Fibrous Porous Ceramics by in-situ Catalysis of Fly Ash

作　　者：付锦绣 马玉婷 孟庆博 付千龙 王娟 李双[1] FU Jinxiu;MA Yuting;MENG Qingbo;FU Qianlong;WANG Juan;LI Shuang(School of Resources and Environmental Engineering,Shandong University of Technology,Zibo 255049,Shandong,China;Shandong Jianyan Testing and Inspection Technology Co.,Ltd.,Jinan,255031,China)

机构地区：[1]山东理工大学资源与环境工程学院,山东淄博255049 [2]山东建研检测检验科技有限公司,济南250031

出　　处：《硅酸盐学报》2024年第9期2969-2980,共12页Journal of The Chinese Ceramic Society

基　　金：山东省自然科学基金(ZR2020MEM027);国家自然科学基金(Grant no.52002364)资助。

摘　　要：随着碳减排政策的实施和水处理标准的提升,多孔陶瓷在水处理中的应用受到越来越广泛的关注。传统的多孔陶瓷材料受到原料来源、制备能耗等方面的限制,在水处理行业的规模化应用受到极大限制,因此开发低制备成本、高渗透通量的多孔陶瓷成为亟待解决的问题。本文以粉煤灰为主要材料、氟化铝(AlF_(3))为催化剂,制备了高孔隙率、高通量莫来石多孔陶瓷,研究了AlF_(3)催化莫来石晶须的形成机理及莫来石多孔陶瓷孔结构构筑过程。随着莫来石晶须的生长,1200℃烧结多孔陶瓷的孔隙率从56.4%增加到57.6%,平均孔径从0.75μm增加到1.24μm。考察了莫来石多孔陶瓷在乳化液处理中的选择渗透性,当跨膜压力低于0.25 bar时其截留率率超过90.2%。Introduction Porous ceramics are-widely used in a variety of environmental fields such as solid-liquid separation and hot gas filtration due to their high mechanical strength,excellent chemical resistance,and high thermal stability.Conventional porous ceramics are usually made of particle-packing of inorganic powders,which are usually characterized by a low porosity,a high self-weight,a low permeability and a high filtration resistance.It is thus necessary to develop novel porous ceramics with a high porosity,a high mechanical strength and a low packing density.Mullite whisker-based porous ceramics have attracted recent attention in the treatment of various wastewaters.Compared with porous ceramics prepared by conventional particle-packing,mullite whisker-based porous ceramics are constructed by whisker interlocking,resulting in fibrous structures with a high porosity,a high pore connectivity and a low packing density.However,these mullite porous ceramics are seldom used in industry due to the high cost of the high-purity starting materials.Fly ash is a major by-product of coal combustion.The elemental analysis shows that fly ash is mainly composed of unburned carbon,metal oxides(i.e.,Si,Al,and Fe)and other inorganic materials.Fly ash can be used to prepare mullite porous ceramics due to the presence the high content of aluminum silicates.However,the effect of holding time on the growth of mullite whiskers and the permeance-selectivity of the fibrous structures is still unclear.In order to elucidate the growth mechanism of mullite whiskers based on gas-solid reaction,the effects of sintering temperature and holding time on the microstructure,phase composition and filtration properties of the porous ceramics were investigated.Methods Fly ash powder provided by Huaneng Thermal Power Plant in Zibo,China,and Al(OH)_(3)purchased from Sinopharm Chemical Reagent Co.Ltd.,China,were used as major materials.AlF_(3)·3H_(2)O purchased from Sinopharm Chemical Reagent Co.Ltd.,China,was employed as a catalyst for mullite whisk

关 键 词：多孔陶瓷 孔隙率 粉煤灰 烧结 莫来石晶须 

分 类 号：TB332[一般工业技术—材料科学与工程]