采用普通陶瓷原料制备低成本多通道堇青石质陶瓷微滤膜

Preparation of Inexpensive Multi-Channel Cordierite Ceramic Microfiltration Membrane Using Traditional Ceramic Materials

采用高岭土、铝矾土、滑石等普通天然原料,利用挤压成型法和浸渍提拉法制备了低成本多通道堇青石质陶瓷微滤膜。同时采用扫描电子显微镜、X射线衍射仪等对膜样品的显微结构及性能进行表征。结果表明,在1200℃下烧成,可成功制备孔隙率为28.2%的多通道堇青石质陶瓷微滤膜载体。然后通过浸渍提拉法,在固含量为25 wt%、浸渍时间为10s的工艺下,制备了厚度约为80μm的堇青石质顶膜。同时,实验制备的微滤膜还具备热膨胀系数低、结构均匀无缺陷和耐碱性能良好等优点。

The inexpensive multi-channel cordierite ceramic microfiltration membrane was prepared with traditional ceramic materials,such as kaolin,bauxite and talc,by extrusion and dip-coating.The microstructure and performance of the membrane samples were characterized by scanning electron microscope and X-ray diffraction.The results show that the cordierite support with the porosity of 28.2 % is prepared at 1200 ℃.The cordierite top membrane with the thickness of about 80 μm is formed by dip-coating when the solid content is 25 wt% and the dipping time is 10 s.The microfiltration membrane has lower thermal expansion coefficient,better microstructure and alkaline-resistance.