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

LIU Wei; YI Yuanrong; LI Chunhui; LI Jie; DINA Jaabay

doi:10.13205/j.hjgc.202406015

Volume 42 Issue 6

Jun. 2024

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2024 > 42(6): 127-135

LIU Wei, YI Yuanrong, LI Chunhui, LI Jie, DINA Jaabay. MECHANISM OF SOLIDIFICATION OF HEAVY METALS (Zn, Cd) BY LADLE FURNACE SLAG-FLY ASH BASED GEOPOLYMERS[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(6): 127-135. doi: 10.13205/j.hjgc.202406015

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LIU Wei, YI Yuanrong, LI Chunhui, LI Jie, DINA Jaabay. MECHANISM OF SOLIDIFICATION OF HEAVY METALS (Zn, Cd) BY LADLE FURNACE SLAG-FLY ASH BASED GEOPOLYMERS[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(6): 127-135. doi: 10.13205/j.hjgc.202406015

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

doi: 10.13205/j.hjgc.202406015

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

Received Date: 2023-09-27
Available Online: 2024-07-11

Abstract

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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References(38)

References

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