赤泥基发泡地质聚合物的性能研究  

Properties of Red Mud-Based Foamed Geopolymer

作　　者：吕政晔 张延博 刘泽[1] 彭中昊 王栋民[1] LYU Zhengye;ZHANG Yanbo;LIU Ze;PENG Zhonghao;WANG Dongmin(School of Chemical and Environmental Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《硅酸盐通报》2023年第10期3624-3632,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划(2019YFC1904302);宁夏回族自治区重点研发计划(2021BEG92002);国家自然科学基金联合基金(U20A20324)。

摘　　要：拜耳法赤泥含有较多赤铁矿且活性较低,一定程度上限制了其资源化利用。将拜耳法赤泥、矿渣微粉和粉煤灰以5∶3∶2的质量比混合,以水玻璃和氢氧化钠为碱激发剂,硬脂酸钙为稳泡剂,双氧水为发泡剂,制备发泡地质聚合物。通过调节碱激发剂模数,探究其对赤泥基发泡地质聚合物表观密度、强度以及微观结构的影响。结果表明,随着碱激发剂模数的增加,发泡地质聚合物的表观密度呈先增加后降低的趋势,抗压强度逐渐下降。当碱激发剂模数为1.4时,发泡地质聚合物的28 d表观密度最低,为195.86 kg/m^(3);28 d抗压强度达到最高值,为0.55 MPa,对应比强度为2821.12 N·m/kg。这说明碱激发剂模数为1.4时发泡地质聚合物兼顾轻质与高强的性能。Red mud from Bayer process contains more hematite and has lower activity,which limit its resource utilization to some extent.The Bayer red mud,blast furnace slag and fly ash were mixed at a mass ratio of 5∶3∶2,sodium silicate and sodium hydroxide were used as alkali activator,calcium stearate was used as foam stabilizer and hydrogen peroxide was used as foaming agent,then the foamed geopolymer was prepared.The influence of alkali activator modulus on the bulk density,strength and microstructure of red mud-based foamed geopolymer was investigated.The results show that,with the increase of modulus of alkali activator,the bulk density of foamed geopolymer increases first and then decreases,and the compressive strength decreases gradually.When the modulus of alkali activator is 1.4,the bulk density at 28 d of foamed geopolymer is the lowest(195.86 kg/m^(3)),the compressive strength at 28 d is the highest(0.55 MPa),and the specific strength reaches the highest(2821.12 N·m/kg).The results show that the foamed geopolymer has the best performance of low density and high strength when the modulus of alkali activator is 1.4.

关 键 词：赤泥 发泡 地质聚合物 表观密度 力学性能 

分 类 号：TU52[建筑科学—建筑技术科学]