Effects of single-phase CuO and multiphase TiO2-CuO-MgO on the properties of fly ash based ceramic membrane support
In this paper,industrial waste fly ash is used as the main material,combined with the binder(car-boxymethyl cellulose CMC)and pore-making agent(charcoal powder),to explore the role and effect of the sin-tering additives(single-phase:CuO;Multiphase:TiO2-CuO-MgO)in the firing of fly ash based ceramic mem-brane support.Firstly,the effects of the amount of CuO additive on the macroscopic physical and chemical properties(pure water flux,flexure strength,acid/alkali corrosion rate)and microstructure characteristics(material composition and micro-morphology)of the support were investigated.Secondly,orthogonal experi-ments were conducted to study the performance of support under different proportions of TiO2-CuO-MgO,so as to obtain the optimal preparation scheme.The results show that at the firing temperature of 1 050 ℃,the sample performance is good when the CuO content is 1％(mass fraction).The pure water flux is 2 649.577 L/(m2·h·MPa),the bending strength is 49.677 MPa,the acid/alkali corrosion rate is 0.471％/0.107％,and the average pore size is 2.375 μm.The porosity is 45.347％.At 1 050 ℃,when the proportion of TiO2-Cuo-MGo is 1.5％(mass fraction)TiO2,0.7％CuO and 5％MgO,the comprehensive performance of the sample is the best,and the performance data are as follows:pure water flux of 6 729.268 L/(m2·h·MPa),bending strength of 67.454 MPa,acid/alkali corrosion rate of 2.964％/1.427％,average pore size of 4.216 μm,and porosity of 48.608％.
sintering auxiliaryceramic membrane supportfly ashlow temperature sintering
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