粉煤灰基多孔陶瓷膜的制备工艺研究

Research of Process for Preparation of Porous Ceramic Membrane

为了研究多孔陶瓷膜样品的主要实验影响因素,通过单因素试验法探究不同工艺条件对制备多孔陶瓷膜样品性能的影响,并作正交优化试验。以粉煤灰为主原料,经过研磨过筛处理后,添加少量Al_2O_3、造孔剂和TiO_2,均匀混合,模压成型,高温烧结后制得多孔陶瓷膜。在优化试验配方和工艺参数后,当粉煤灰80wt%、Al_2O_38wt%、淀粉10wt%、TiO_22wt%、模压强度为18MPa、烧成温度为1200℃、保温时间为0. 5 h时,烧结得到膜样品的平均孔径为2μm、孔隙率为41. 3%、抗折强度为8. 96 MPa、水通量为1201 L/(m2·h·MPa)、耐酸度为96.5%、耐碱度为95.1%、体积密度为1. 69 g/m L。探究结果表明,烧成温度和造孔剂含量对膜样品性能的影响较大。

In order to study the main influence factors of porous ceramic membrane samples,the single factor experiment was taken to study effect of different process conditions on the performance of porous ceramic membrane,and do orthogonal test also for optimization.The coal ash,as the main raw material,was grinded and sieved,a small amount of Al2O3,pore forming agent and TiO2 were added,and the porous ceramic membrane was prepared by high temperature sintering.After optimizing the test formula and process parameters,when the coal ash content was 80wt%,Al2O3 content was 8wt%,Starch content was 10wt%,TiO2 content was 2wt%,the compression strength was 18MPa,the sintering temperature was 1200℃ and the heat preservation time was 0.5h,that the average pore size of the film samples was 2μm,the porosity was 41.3%,the flexural strength was 8.96MPa,and the water flux was 1201L/(m2ohoMPa),the acid resistance was 96.5%,the alkali resistance was 95.1%,and the bulk density was 1.69g/mL.The results showed that the sintering temperature and pore forming agent content had great influence on the performance of the film.