粉煤灰基多孔地聚物的结构及过滤性能  

Structure and Filtration Performance of Fly Ash-Based Porous Geopolymer

作　　者：陈曦平 王诏田 罗洪杰 程岩[1] 吴林丽 姜昊 CHEN Xiping;WANG Zhaotian;LUO Hongjie;CHENG Yan;WU Linli;JIANG Hao(School of Metallurgy,Northeastern University,Shenyang 110819,China;Engineering Research Center of Advanced Materials Preparing Technology,Ministry of Education,Shenyang 110819,China;Tiancheng Environmental Protection Technology Co.,Ltd.,Fushun 113001,China)

机构地区：[1]东北大学冶金学院,沈阳110819 [2]材料先进制备技术教育部工程研究中心,沈阳110819 [3]抚顺天成环保科技有限公司,抚顺113001

出　　处：《硅酸盐通报》2023年第6期2081-2091,共11页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(51874093);内蒙古2020科技创新引导项目(NMGKJCX202007);内蒙古2018“草原英才”引领项目;徐州市2022科技成果转化项目(KC22450)。

摘　　要：目前,工业除尘滤袋的工作温度不高于280℃,通常在过滤前需先将高温烟气进行降温处理。为了制备高效且耐温性良好的新型过滤材料,本文以粉煤灰为主要原料,以H_(2)O_(2)为发泡剂,通过聚合反应制备了多孔地聚物,并对其形貌、孔结构、抗折强度和过滤性能进行了表征。结果表明:H_(2)O_(2)的最佳添加量为0.98%(质量分数),此时多孔地聚物下表面与内部的平均孔径分别为17.3和171.5μm,孔隙率为56.2%,常温下抗折强度为2.2 MPa,过滤阻力为6.2×10^(-3) MPa,对PM10和PM2.5的过滤效率分别为98.2%和93.3%,经800℃的热处理后,抗折强度增加到3.4 MPa,对PM10和PM2.5的过滤效率均保持在90%以上,过滤阻力增加了1×10^(-3) MPa。因此,以粉煤灰基多孔地聚物作为高温烟气过滤材料具有良好的应用前景。At present,the working temperature of industrial dust removal filter bag is not higher than 280 ℃.The high temperature flue gas needs to be cooled before filtration.In order to prepare a new type of filter material with high efficiency and good temperature resistance,porous geopolymer was prepared by polymerization reaction with fly ash as the main raw material and H_(2)O_(2) as foaming agent.The morphology,pore structure,flexural strength and filtration performance were characterized.The results show that the optimum addition of H_(2)O_(2) is 0.98%(mass fraction).The average pore diameters of the lower surface and the interior of the porous geopolymer are 17.3 and 171.5 μm respectively,the porosity is 56.2%,the flexural strength at room temperature is 2.2 MPa,the filtration resistance is 6.2×10^(-3) MPa,and the filtration efficiency of PM10 and PM2.5 are 98.2% and 93.3%,respectively.After heat treatment at 800 ℃,the flexural strength increases to 3.4 MPa,and the filtration efficiency of PM10 and PM2.5 remains above 90%.The filtration resistance increases by 1×10^(-3) MPa.Therefore,the fly ash-based porous geopolymer has a good application prospect as a high-temperature flue gas filtration material.

关 键 词：粉煤灰 多孔地聚物 高温处理 过滤性能 孔结构 抗折强度 

分 类 号：TB321[一般工业技术—材料科学与工程]