Preparation and performance of fly ash-loess based ceramic membrane supports: Effect of calcium carbonate addition and sintering temperature
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Porous mullite ceramic membrane supports were prepared by fly ash as the main raw material, with addition of loess andbauxite in the ratio of silicon to aluminium in the mullite phase (3Al2O3-2SiO2), calcium carbonate as pore-forming agents andpolyvinyl alcohol as the binder. The effects of calcium carbonate addition (0, 5, 10, and 15 wt%) and sintering temperatureon the performance of prepared supports, including crystalline phase evolution, microstructure, porosity, flexural strength,and pure water flux, were investigated. The results shows that the increase in sintering temperature is beneficial to theformation of the mullite crystalline phase and improves flexural strength. When the sintering temperature reached 1200 °Cand the calcium carbonate content was 5%, the porosity of the support was 46.3% and the flexural strength was 77.7 MPa. Based on the experiments, central composite experiments and response surface analysis were carried out to optimise thepreparation conditions, and determine the optimum amount of calcium carbonate addition and sintering temperature. Theresults of the study are of reference value for the study of inorganic ceramic membrane support.
Abstract
Porous mullite ceramic membrane supports were prepared by fly ash as the main raw material, with addition of loess andbauxite in the ratio of silicon to aluminium in the mullite phase (3Al2O3-2SiO2), calcium carbonate as pore-forming agents andpolyvinyl alcohol as the binder. The effects of calcium carbonate addition (0, 5, 10, and 15 wt%) and sintering temperatureon the performance of prepared supports, including crystalline phase evolution, microstructure, porosity, flexural strength,and pure water flux, were investigated. The results shows that the increase in sintering temperature is beneficial to theformation of the mullite crystalline phase and improves flexural strength. When the sintering temperature reached 1200 °Cand the calcium carbonate content was 5%, the porosity of the support was 46.3% and the flexural strength was 77.7 MPa. Based on the experiments, central composite experiments and response surface analysis were carried out to optimise thepreparation conditions, and determine the optimum amount of calcium carbonate addition and sintering temperature. Theresults of the study are of reference value for the study of inorganic ceramic membrane support.
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