精炼渣-粉煤灰基地聚合物固化重金属(Zn、Cd)机制研究

刘伟; 伊元荣; 李春辉; 李洁; 迪娜&#183;加阿拜

doi:10.13205/j.hjgc.202406015

精炼渣-粉煤灰基地聚合物固化重金属(Zn、Cd)机制研究

doi: 10.13205/j.hjgc.202406015

1. 新疆大学生态与环境学院, 乌鲁木齐 830046;
2. 新疆绿洲生态教育部重点实验室, 乌鲁木齐 830046;
3. 新疆精河温带荒漠生态系统教育部野外科学观测研究站, 乌鲁木齐 830046

基金项目:

新疆自然科学基金资助项目(2022D01C388)

详细信息

作者简介:
刘伟(1999-),女,硕士,主要从事固废资源化利用研究。1498542074@qq.com

通讯作者:
伊元荣(1974-),女,博士,教授,主要从事固体废弃物处理与资源化利用研究。yyrhyw@163.com

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出版历程
- 收稿日期: 2023-09-27
- 网络出版日期: 2024-07-11

MECHANISM OF SOLIDIFICATION OF HEAVY METALS (Zn, Cd) BY LADLE FURNACE SLAG-FLY ASH BASED GEOPOLYMERS

LIU Wei¹,
YI Yuanrong^{1,2,3
, ,},
LI Chunhui¹,
LI Jie¹,
DINA Jaabay¹

1. School of Ecology and Environment, Xinjiang University, Urumqi 830046, China;
2. Key Laboratory of Xinjiang Oasis Ecology, Ministry of Education, Urumqi 830046, China;
3. Field Scientific Observatory of the Ministry of Education for Temperate Desert Ecosystems, Jinghe, Urumqi 830046, China

摘要

摘要: 为改善重金属污染,提高固体废弃物利用率,以精炼渣(LFS)和粉煤灰(FA)为原料,氢氧化钠与水玻璃作为碱激发剂,在碱激发条件下制备地质聚合物固化重金属Zn²⁺、Cd²⁺。研究Zn²⁺、Cd²⁺掺量对固化体强度的影响,通过浸出实验评价地质聚合物对Zn²⁺、Cd²⁺的固定效果,结合XRD、SEM-EDS、FT-IR、XPS等表征方法对固定机制进行研究。结果表明:精炼渣-粉煤灰基地质聚合物与Zn²⁺、Cd²⁺具有良好的相容性,含有1.0% Cd²⁺固化体28 d的抗压强度可达到40.62 MPa,水化浸出实验中Zn²⁺、Cd²⁺固化率均在99.6%以上;Zn²⁺、Cd²⁺加入后固化体中不会有新相生成,且在固化过程中未发生化学价态变化。金属离子能有效地固定在精炼渣基地质聚合物中,主要通过物理包封、吸附作用,少量重金属离子则是通过化学键合,以Si—O—M和Al—O—M (M=Zn、Cd)的形式存在于固化体中。
- 精炼渣 /
- 粉煤灰 /
- 地质聚合物 /
- 重金属 /
- 固化机理
Abstract: To improve the pollution of heavy metals and increase the utilization rate of solid waste, this study prepared geopolymers for the solidification of Zn²⁺, and Cd²⁺ under alkaline excitation conditions using ladle furnace slag (LFS) and fly ash (FA) as raw materials, and sodium hydroxide and water glass as alkaline activator. The effect of Zn²⁺ and Cd²⁺ doping on the strength of the cured body was investigated, and the immobilization effect of the geopolymer on Zn²⁺ and Cd²⁺ was evaluated by leaching experiments, and the immobilization mechanism was investigated by combining the characterization methods such as XRD, SEM-EDS, FT-IR, and XPS. The results showed that the LFS-FA-based geopolymer has good compatibility with Zn²⁺ and Cd²⁺, the compressive strength of the cured body containing 1.0% Cd²⁺ for 28 d could reach 40.62 MPa, and the curing rate of Zn²⁺ and Cd²⁺ in the hydration leaching experiments was over 99.6%; there was no new phase generated in the cured body after the incorporation of Zn²⁺ and Cd²⁺, and no chemical valence change occurred during the curing process. Metal ions can be effectively fixed in ladle furnace slag base polymer, mainly through physical encapsulation, and adsorption, while a small number of heavy metal ions exist in the curing body in the form of Si—O—M and Al—O—M (M=Zn, Cd) through chemical bonding.
- ladle furnace slag /
- fly ash /
- geopolymer /
- heavy metal /
- solidification mechanism

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