碱激发垃圾焚烧底灰地聚物的制备及其水化特性研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (1): 287-294.

碱激发垃圾焚烧底灰地聚物的制备及其水化特性研究

刘刚^{1, 2}, 李心诚^{1, 2}, 刘金军², 蹇守卫^{1, 2}, 范璐璐^{2, 3}, 涂亮亮^{2, 3}

1.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
2.武汉理工大学材料科学与工程学院,武汉 430070;
3.深圳市特区建工集团有限公司,深圳 518000

收稿日期:2023-08-25 修订日期:2023-10-27 出版日期:2024-01-15 发布日期:2024-01-16
通信作者: 刘金军,助理研究员。E-mail:whutm@whut.edu.cn
作者简介:刘刚(1981—)男,博士,教授。主要从事道路新材料研发、固废循环利用方面的研究。E-mail:liug@whut.edu.cn
基金资助:
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)

Preparation and Hydration Characteristics of Alkali Excited Municipal Solid Waste Incineration Bottom Ash Geopolymer

LIU Gang^1,2, LI Xincheng^1,2, LIU Jinjun², JIAN Shouwei^1,2, FAN Lulu^2,3, TU Liangliang^2,3

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan430070, China;
2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
3. Shenzhen Special Zone Construction Group Co., Ltd., Shenzhen 518000, China

Received:2023-08-25 Revised:2023-10-27 Online:2024-01-15 Published:2024-01-16

摘要/Abstract

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。

关键词: 碱激发, 垃圾焚烧底灰, 地聚物, 强度, 重金属固化

Abstract: 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.

Key words: alkali excited, municipal solid waste incineration bottom ash, geopolymer, strength, heavy metal solidification

中图分类号:

X705

刘刚, 李心诚, 刘金军, 蹇守卫, 范璐璐, 涂亮亮. 碱激发垃圾焚烧底灰地聚物的制备及其水化特性研究[J]. 硅酸盐通报, 2024, 43(1): 287-294.

LIU Gang, LI Xincheng, LIU Jinjun, JIAN Shouwei, FAN Lulu, TU Liangliang. Preparation and Hydration Characteristics of Alkali Excited Municipal Solid Waste Incineration Bottom Ash Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 287-294.

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