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Co-disposal of MSWI fly ash and lead–zinc smelting slag through alkali-activation technology
Highlights MSWI fly ash and LZSS were successfully co-disposed through alkali-activation technology. Heavy metals were effectively immobilized in the prepared AAFL. Physical encapsulation played a major role in heavy metal immobilization. The AAFL has the potential to be the construction materials.
Abstract MSWI fly ash and lead–zinc smelting slag (LZSS) are solid wastes containing heavy metals and negatively impact the environment. This study synthesized MSWI fly ash-LZSS based alkali-activated cementitious material (AAFL) material for their co-disposal. The experimental results revealed that the compressive strength of AAFL raised as the SiO2/Na2O molar ratio and alkali content increased but decreased as the liquid–solid ratio and initial curing temperature increased. The immobilization ratios of Zn, Pb and Cu in AAFL were above 97%. Heavy metal speciation, XRD, FTIR, SEM and EDS analysis indicated that the main reaction products were calcium silicate hydrate (C-S-H) and amorphous aluminosilicate gels, and heavy metals were mainly immobilized through physical encapsulation.
Co-disposal of MSWI fly ash and lead–zinc smelting slag through alkali-activation technology
Highlights MSWI fly ash and LZSS were successfully co-disposed through alkali-activation technology. Heavy metals were effectively immobilized in the prepared AAFL. Physical encapsulation played a major role in heavy metal immobilization. The AAFL has the potential to be the construction materials.
Abstract MSWI fly ash and lead–zinc smelting slag (LZSS) are solid wastes containing heavy metals and negatively impact the environment. This study synthesized MSWI fly ash-LZSS based alkali-activated cementitious material (AAFL) material for their co-disposal. The experimental results revealed that the compressive strength of AAFL raised as the SiO2/Na2O molar ratio and alkali content increased but decreased as the liquid–solid ratio and initial curing temperature increased. The immobilization ratios of Zn, Pb and Cu in AAFL were above 97%. Heavy metal speciation, XRD, FTIR, SEM and EDS analysis indicated that the main reaction products were calcium silicate hydrate (C-S-H) and amorphous aluminosilicate gels, and heavy metals were mainly immobilized through physical encapsulation.
Co-disposal of MSWI fly ash and lead–zinc smelting slag through alkali-activation technology
Luo, Shiyu (author) / Zhao, Shujie (author) / Zhang, Pengpeng (author) / Li, Jing (author) / Huang, Xiao (author) / Jiao, Binquan (author) / Li, Dongwei (author)
2022-02-27
Article (Journal)
Electronic Resource
English
Disposal of slag from smelting works
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