单相CuO与复相TiO2-CuO-MgO对粉煤灰基陶瓷膜支撑体的性能影响研究.

In this paper, industrial waste fly ash is used as the main material, combined with the binder (carboxymethyl cellulose CMC) and pore-making agent (charcoal powder), to explore the role and effect of the sintering additives (single-phase: CuO; Multiphase: TiO2-CuO-MgO) in the firing of fly ash based ceramic membrane 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 experiments 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%. [ABSTRACT FROM AUTHOR]