热等离子体制备的超细球形氧化铝具有表面致密光滑、分散性好等特点，本工作以超细球形氧化铝为原料，通过浸渍提拉烧结法，制备了孔径分布窄、渗透通量高的陶瓷超滤膜，研究了烧结温度对陶瓷膜微孔结构的演化、孔径分布和渗透通量的影响。随后对1250℃下烧结的陶瓷膜进行了纳米硅水分散液过滤处理，采用不同堵塞模型分析了陶瓷膜过滤纳米硅水分散液的膜污染过程。结果表明，通过调节烧结温度调控陶瓷膜的微孔结构，当烧结温度为1250℃时，陶瓷膜的孔径分布较窄，孔径大小为25?65 nm，渗透通量为986.4 L/(m2?h)。超细球形氧化铝粒径分布较窄及表面致密光滑有助于1250℃下烧结形成均匀的烧结颈，提供了陶瓷膜较窄的孔径分布。对1250℃下烧结的陶瓷膜进行了纳米硅水分散液过滤处理后其浊度下降为0.231 NTU，浊度去除率达99.96%。采用不同堵塞模型分析了陶瓷膜过滤纳米硅水分散液的膜污染过程，结果表明，纳米硅水分散液的堵塞模型是滤饼过滤，属于可逆污染。

Ceramic membranes with the advantages of excellent thermal, chemical and higher permeable properties have attracted more attention and have been applied in turbidity removal, sanitary wastewater and other important industries. However, the ceramic membrane required “coating-drying-sintering” process, in which the process inevitably leads to cracks and wide pore size distribution. In this study, ceramic ultrafiltration membranes with narrow pore size distribution and high permeability were prepared by the dip?coating method using ultrafine spherical alumina powders with high density and smooth surface synthesized by thermal plasma. The microstructure evolution of prepared membranes could be controlled by adjusting the sintering temperature, and the ceramic membranes with a narrow pore size distribution of 25?65 nm and a high pure water permeability of 986.4 L/(m2?h) were sintered at 1250℃. The sintering mechanism of the ceramic membrane was fully investigated and it was found that the narrow pore size distribution of membranes came from the spherical Al2O3 powders with the narrow particle size distribution and high density synthesized by thermal plasma, and the homogeneous sintering necks formed at 1250℃. The result indicated that the pure water flux of the membranes decreased as the sintering temperature increased. It can be explained that the surface of ceramic membranes became denser with the increase of the sintering temperature, resulting in the decrease in porosity and the average pore size. In addition, the prepared membranes were employed to filter the nano-silicon dispersion slurry to evaluate the performance of the membranes sintered under different temperatures. The result indicated that the membrane sintered at 1250℃ showed a higher removal rate of turbidity (99.96%), and the turbidity of the permeate was 0.231 NTU. Finally, the reduction of the permeate flux of the nano-silicon dispersion slurry were analyzed using pore blocking models, and it was found that the cake filtration model was suitable to the prepared membranes.