3种不同造孔剂对黄土基陶瓷膜支撑体性能的分析研究

Analysis of properties of loess-based ceramic membrane supports by three different pore-forming agents

本实验以洛川黄土为骨料,分别选用淀粉、煤粉、尿素为造孔剂。采用添加不同造孔剂、利用滚压成型法制备黄土基陶瓷膜支撑体。通过三点弯曲法、压汞法、酸/碱质量损失法、X-射线衍射(XRD)、扫描电镜(SEM)及实验室自制装置对支撑体的抗折强度、孔径分布、酸碱腐蚀率、晶相组成、表面微观形貌和纯水通量等性能进行分析表征。通过对3种造孔剂对比分析,在相同添加量下,不同造孔剂对支撑体纯水通量影响效果:淀粉煤粉尿素;对抗折强度的影响效果:淀粉煤粉尿素,综合各因素确定淀粉为最佳造孔剂。结果表明,淀粉的最佳添加量为8%,支撑体的抗折强度为36.25 MPa,纯水通量为6232.11 L/m^2·h·MPa,酸碱质量腐蚀率0.07/0.02%,中值孔径为5.36777μm,主峰孔径分布范围0.105~8.223μm。

In this experiment,Luochuan loess was used as aggregate,and starch,coal powder and urea were used as pore-forming agents.A loess-based ceramic membrane support was prepared by a roll forming method with different pore-forming agents.The flexural strength,pore size distribution and acid-base corrosion rate of the support were researched by three-point bending method,mercury intrusion method,acid/base mass loss method,X-ray diffraction(XRD),scanning electron microscopy(SEM)and laboratory-made equipment.The properties of crystal phase composition,surface micro-morphology and pure water flux were analyzed and characterized.Through the comparative analysis of three kinds of pore-forming agents,under the same addition amount,the effect of different pore-forming agents on the pure water flux of the support was starch,pulverized coal and urea.The effect of the anti-folding strength was starch,pulverized coal and urea.Among comprehensive factors,starch was determined to be the best pore former.The results showed that the optimum addition amount of starch was 8%,the flexural strength of the support was 36.25 MPa,the pure water flux was 6232.11 L/(m^2·h·MPa),the acid-base corrosion rate was 0.07/0.02%,and the median pore diameter was 0.031/0.02%.The median pore diameter was 5.36777 um,and the main peak pore size distribution range was 0.105 um-8.223 um.