Effect of composite pore-forming agent on the performance of fly ash ceramic membrane support
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In order to prevent the problem of fracture of ceramic membrane supports during sintering due to excessive sintering losses,the effects of sintering temperature, composite pore-forming agent content and heating rate on the supports were thoroughlyinvestigated. The results show that compared with a single pore-forming agent, the composite pore-forming agent can preventits own rapid decomposition and widen the temperature range, thus it is easier to prepare the ceramic membrane supportwith high permeability. When the sintering temperature was 1020.69 °C, the composite pore-forming agent content was 11.46wt%, and the heating rate was 10 °C/min, the optimal support was prepared with a pure water flux of 2983.81 L/(m2·h·MPa),a flexural strength of 31.27 MPa, and an average pore size of about 1.88μm.This method can greatly shorten the firing cyclewithout compromising the support qualities, since these properties are mainly affected by the amount of pore-forming agentrather than the heating rate. According to acid and alkali corrosion experiments, the fly ash-based support body has goodresistance to acid and alkali corrosion. Therefore, the addition of a composite pore-forming agent is a feasible method toproduce high-flux, high-porosity ceramic membrane supports and rapid firing, and the obtained supports are compatiblewith the application conditions of porous ceramic materials.
Abstract
In order to prevent the problem of fracture of ceramic membrane supports during sintering due to excessive sintering losses,the effects of sintering temperature, composite pore-forming agent content and heating rate on the supports were thoroughlyinvestigated. The results show that compared with a single pore-forming agent, the composite pore-forming agent can preventits own rapid decomposition and widen the temperature range, thus it is easier to prepare the ceramic membrane supportwith high permeability. When the sintering temperature was 1020.69 °C, the composite pore-forming agent content was 11.46wt%, and the heating rate was 10 °C/min, the optimal support was prepared with a pure water flux of 2983.81 L/(m2·h·MPa),a flexural strength of 31.27 MPa, and an average pore size of about 1.88μm.This method can greatly shorten the firing cyclewithout compromising the support qualities, since these properties are mainly affected by the amount of pore-forming agentrather than the heating rate. According to acid and alkali corrosion experiments, the fly ash-based support body has goodresistance to acid and alkali corrosion. Therefore, the addition of a composite pore-forming agent is a feasible method toproduce high-flux, high-porosity ceramic membrane supports and rapid firing, and the obtained supports are compatiblewith the application conditions of porous ceramic materials.