摘要
本文采用城市垃圾焚烧底灰(BA)、偏高岭土和矿粉作为原料,NaOH和水玻璃作为碱激发剂来制备底灰地聚物,重点研究了不同碱含量、BA掺量对聚合物抗压强度及水化特性的影响。研究表明:当碱含量达7%(质量分数,下同)时,过量的钠与活性钙、活性硅和铝反应,从而形成大量低强度N-A-S-H,使底灰地聚物强度下降;当碱含量固定、BA掺量达到80%时,底灰地聚物的强度大幅度降低。对于底灰而言,其聚合物体系对重金属离子具有显著的固化效果。因此,采用BA制备底灰地聚物对城市固废绿色再生利用和环境保护具有重要意义。
To prepare the bottom ash geopolymer,municipal solid waste incineration bottom ash(BA),metakaolin and granulated blast furnace slag were selected as raw materials,and NaOH and water glass were adopted as alkali activators.The effects of different alkali content and BA content on compressive strength of geopolymer and hydration characteristics were mainly investigated.The results show that,when the alkali content reaches 7%(mass fraction,the same below),the reaction between excess sodium and active silicon,calcium and aluminum causes a large amount of low-strength N-A-S-H,which decreases the strength of bottom ash geopolymer.When the alkali content remains constant and the BA content reaches 80%,the strength of bottom ash geopolymer decreases substantially.Regarding bottom ash,its geopolymer system has a significant curing effect on heavy metal ions.Therefore,bottom ash geopolymer preparing by BA is of great significance for green recycling of municipal solid waste and environmental protection.
作者
刘刚
李心诚
刘金军
蹇守卫
范璐璐
涂亮亮
LIU Gang;LI Xincheng;LIU Jinjun;JIAN Shouwei;FAN Lulu;TU Liangliang(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Shenzhen Special Zone Construction Group Co.,Ltd.,Shenzhen 518000,China)
出处
《硅酸盐通报》
CAS
北大核心
2024年第1期287-294,共8页
Bulletin of the Chinese Ceramic Society
基金
海南省科技计划三亚崖州湾科技城联合项目(520LH016)
湖北省科学技术厅重点研发计划(2021BCA126)
国家自然科学基金(52068061)。
关键词
碱激发
垃圾焚烧底灰
地聚物
强度
重金属固化
alkali excited
municipal solid waste incineration bottom ash
geopolymer
strength
heavy metal solidification
