Immobilisation of heavy metals in hazardous waste incineration residue using SiO2–Al2O3–Fe2O3–CaO glass-ceramic

Chen, Hongcai; Lin, Huirong; Zhang, Pengpeng; Yu, Lin; Chen, Liangjun; Huang, Xianghua; Jiao, Binquan; Li, Dongwei

doi:10.1016/j.ceramint.2020.11.213

Cited by 47 publications

(17 citation statements)

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“…We have previously reported that under a crystallization temperature of 1080 °C, crystallization time of 1 h, nucleation temperature of 760 °C, and nucleation time of 1 h, the compressive strength of self-sintered glass-ceramics can reach 204.84 MPa. 16 Compared with previous experiments, 16 the gradient of the heat treatment system was reduced, indicating that the compressive strength can be used as an indicator when optimizing the heat treatment system (in terms of nucleation temperature, nucleation time, crystallization temperature, and crystallization time) through an orthogonal experiment. The experiment design and optimization results are presented in Table 3 and Figure 2, respectively.…”

Section: Resultsmentioning

confidence: 82%

“…As the span of the exothermic peak is large (300 °C) and does not change dramatically, the powder sintering method is suitable for preparing glass-ceramics. 16 3.2. Heat-Treatment System Optimization for Incineration Residue-Based Glass-Ceramics.…”

Section: Resultsmentioning

confidence: 99%

“…Figure shows that the HWIR base glass loses no weight below 1200 °C, with the glass transition temperature ( T g ) appearing at 672 °C and the exothermic peak of crystallization spanning 870–1170 °C with the peak temperature ( T p ) at 1080 °C. As the span of the exothermic peak is large (300 °C) and does not change dramatically, the powder sintering method is suitable for preparing glass-ceramics …”

Section: Resultsmentioning

confidence: 99%

“…The sintered product was cooled using the furnace to obtain the glass-ceramics. Based on previous experiments, 16 four-factor, three-level orthogonal experiments were designed to explore the respective effects of nucleation temperature, nucleation time, crystallization temperature, and crystallization time on the resulting HWIR-based glass-ceramics for optimizing the preparation process. The design of the orthogonal experiment is presented in Table 3.…”

Section: Methodsmentioning

confidence: 99%

“…By conducting long- term leaching tests and assessing the potential ecological risk, the authors showed that the heavy metals in the sintered samples were stable and posed no direct threat to the environment. Alternatively, Chen et al 16 used melting methodinduced sintering to prepare glass-ceramics based on SiO 2 − Al 2 O 3 −Fe 2 O 3 −CaO incineration residue. This approach achieved high solidification efficiency (>99%) regarding the Zn, Cu, and Cr content of the incineration residue.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Glass-Ceramics via Cosintering and Solidification of Hazardous Waste Incineration Residue and Chromium-Containing Sludge

et al. 2021

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Residues from the incineration of hazardous wastes are classified as hazardous byproducts because they contain heavy metals. Chromium-containing sludge (CCS) is industrial sludge produced during the electroplating process and includes heavy metals, such as Cr, Pb, and Cu. These heavy metals can infiltrate natural ecosystems and cause significant environmental damage. To limit the toxicity of leached products, hazardous waste incineration residues (HWIRs) can be repurposed as raw materials for producing glass-ceramics. In this study, we designed an orthogonal experiment to optimize the heat treatment process, yielding glass-ceramics with excellent properties and realizing heavy metal solidification. The toxic characteristic leaching procedure was used to determine the leaching toxicity of the cosintered solidified heavy metals, revealing that their solidification efficiencies exceed 90%. Moreover, X-ray diffraction analysis indicates that certain heavy metals participate in the formation of heavy-metal-containing crystal lattices (FeCr2O4 and PbFe12O19), thereby reducing their leaching concentration. These results show that cosintering HWIR and CCS is an effective approach for heavy metal solidification and provides valuable insights into its utilization for producing building materials.

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation of Glass-Ceramics via Cosintering and Solidification of Hazardous Waste Incineration Residue and Chromium-Containing Sludge

et al. 2021

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Reusing ceramic waste in fired brick and as cement additive

Zoqi,

Doosti

2023

J of Chemical Tech & Biotech

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BACKGROUNDAlthough there has been considerable research on the utilization of ceramic and tile waste (CTW) in concrete production, there has been a noticeable lack of studies examining its application in fired brick manufacturing and the use of ceramic glaze powder as an additive in cement. The aim of this study is to assess the potential of reusing CTW as concrete aggregate and as part of fired brick composition. Furthermore, this research investigates the potential application of glaze powder as a novel cement additive, which has not been previously explored.RESULTSThe results indicate that bricks made from waste materials had a moisture absorption of 12.2% and flexural strengths ranging from 15.39 to 24.2 MPa. X‐ray diffraction analysis showed that quartz and kaolinite were the dominant crystalline phases in bricks made from raw glazed ceramic. The concentration of heavy metals in the toxicity characteristic leaching procedure leachate of the waste materials decreased after the firing process during the manufacturing of bricks due to oxidation, immobilization and encapsulation processes, with levels below standard limits. In concrete, the use of 20% ceramic glaze powder as a partial cement replacement resulted in a 55% increase in compressive strength. Additionally, the leaching of barium decreased by 70% and that of strontium decreased by 17%.CONCLUSIONThis study highlights the promising utilization of CTW in fired brick production and the effective incorporation of ceramic glaze powder as a cement additive. The findings suggest enhanced mechanical properties and decreased heavy metal leaching, indicating the viability of CTW reuse in sustainable construction practices. © 2023 Society of Chemical Industry (SCI).

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