Preparation And Characterization Method Study Of Al₂O₃ Ceramic Microfiltration Membrane

In this dissertation, a suit of testing device and method were made use of characterizing inorganic membrane performance were set up. The preparation technics of alumina ceramic microfiltration membrane by solid-state-particles sintering method were investigated. The pore size distribution, porsity, flux of water and the microstructure were characterizated by testing device and SEM. Free-detect microfiltration which microstructure and performance parameters could be controlled were obtained.Firstly, the device and method of testing pore size distribution were set up acording to the experimnet condition. The data were disposed through Origin software and the disposed result compared with which were dealed with by the research center of membrane science & technique of Nanjing Polytechnic University was credible. The device and method of testing ceramic porosity by Nation Standard were improved on. The results of vacuum method and ferv method had been carefully checked and compared and the former was exact. The device of testing water flux was set up, too. Research proved that the method which fresh egg albumin was used to measure rejection ration of ultrafiltration membrane could not be used in microfiltration membrane.Secondly, the preparation of alumina microfiltration membrane by solid-state-particles sintering was studied . The result showed that the power size of different additive had great effect on membrane performance . If the power size of additive was smaller, the pore size distribution was more narrow. The membrane performance could be adjusted by changing the variety and dosage of pore-forming additive and sintering additive, sintering temperature, sintering time and increasing velocity of sintering temperature. Increasing velocity of sintering temperature in initial stage of sintering should be controlled accurately to ensure that free-detect microfiltration membrane was obtained, especially when pore-forming additive was much more (>20%). Therefore, all sorts of factors should be considered comprehensively according to the use of different membrane.The characteristics of alumina microfiltration membranes obtained in this paper had met the need of microfiltration, which were: the most pore size 0.26 u m , porosity 32.15% , pure water permeability flux 488.5L/(m2 h) (under the pressure of 0.2Mpa). The membrane obtained could be used as microfiltration , and the support of ultrafiltration as well as.