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Preparation of lightweight aggregates via co-sintering MSWI fly ash and waste CRT with potential for heavy metals and chlorine recovery.

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Τίτλος: Preparation of lightweight aggregates via co-sintering MSWI fly ash and waste CRT with potential for heavy metals and chlorine recovery.
Συγγραφείς: Huang J; South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China; School of Environment, Tsinghua University, Beijing 100084, China., Xu S; School of Environment, Tsinghua University, Beijing 100084, China., Ma X; School of Environment, Tsinghua University, Beijing 100084, China., Liu D; China Tobacco Standardization Research Center, Zhengzhou Tobacco Research Institute, 2 Fengyang Road, Gaoxin District, Zhengzhou City, Henan Province 450000, China., Jin Y; School of Environment, Tsinghua University, Beijing 100084, China. Electronic address: jinyy@mail.tsinghua.edu.cn., Tan X; South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China., Cai B; South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China., Ren T; South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China., Shi L; South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China., Luo B; South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China.
Πηγή: Waste management (New York, N.Y.) [Waste Manag] 2026 Oct 30; Vol. 226, pp. 115796. Date of Electronic Publication: 2026 Aug 26.
Τύπος έκδοσης: Journal Article
Γλώσσα: English
Στοιχεία περιοδικού: Publisher: Pergamon Press Country of Publication: United States NLM ID: 9884362 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-2456 (Electronic) Linking ISSN: 0956053X NLM ISO Abbreviation: Waste Manag Subsets: MEDLINE
Imprint Name(s): Original Publication: New York : Pergamon Press, c1989-
Ιατρικοί όροι (MeSH): Coal Ash*/chemistry , Chlorine*/analysis , Chlorine*/chemistry , Metals, Heavy*/analysis , Metals, Heavy*/chemistry , Solid Waste*/analysis , Incineration* , Cathode Ray Tube*
Περίληψη: Municipal solid waste incineration fly ash (MSWI FA) poses great resource utilization challenges due to contained high concentration of heavy metals (HMs) and chlorine (Cl). In this study, lightweight aggregates (LWAs) were produced using FA and waste cathode ray tubes (CRT). The influences of sintering temperature and phosphates addition on HMs and Cl volatilization, pore structure and mineral phase evolution were investigated. When the mass ratio of FA to CRT was 7:3 and sintering temperature ranged from 1150 to 1200 °C, the removal efficiencies of lead (Pb), zinc (Zn) and cadmium (Cd) all exceeded 90%, whereas that of copper (Cu) surpassed 65%. The secondary fly ash (SFA) is rich in Cl and HMs, endowing it with promising potential for resource recovery. Phosphates had a negligible effect on the volatilization of HMs at high temperatures; however, they suppressed chlorine release via the formation of chlorapatite. As Ca3(PO4)2 dosage increased from 0 to 10%, Cl removal rates decreased from 95.86% to 85.28%, but the water-soluble Cl content in sintered products remained lower than 2%. The incorporation of CRT facilitated sintering at reduced temperatures. With SiN employed as a foaming agent, the total porosity rose markedly as the sintering temperature elevated, reaching at the maximum value of 68.67% under the FA:CRT mass ratio of 7:3 at 1200 °C. Environmental risk assessment verified that the sintered LWAs present low ecological risk.
(Copyright © 2026. Published by Elsevier Ltd.)
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Contributed Indexing: Keywords: Chlorine; Heavy metals; Lightweight aggregates; Municipal solid waste incineration fly ash; Powder sintering process; Waste cathode ray tubes
Substance Nomenclature: 0 (Coal Ash)
4R7X1O2820 (Chlorine)
0 (Metals, Heavy)
0 (Solid Waste)
Entry Date(s): Date Created: 20260826 Date Completed: 20260917 Latest Revision: 20260917
Update Code: 20260918
DOI: 10.1016/j.wasman.2026.115796
PMID: 42648139
Βάση Δεδομένων: MEDLINE
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  Data: Preparation of lightweight aggregates via co-sintering MSWI fly ash and waste CRT with potential for heavy metals and chlorine recovery.
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  Data: <searchLink fieldCode="AU" term="%22Huang+J%22">Huang J</searchLink>; South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China; School of Environment, Tsinghua University, Beijing 100084, China.<br /><searchLink fieldCode="AU" term="%22Xu+S%22">Xu S</searchLink>; School of Environment, Tsinghua University, Beijing 100084, China.<br /><searchLink fieldCode="AU" term="%22Ma+X%22">Ma X</searchLink>; School of Environment, Tsinghua University, Beijing 100084, China.<br /><searchLink fieldCode="AU" term="%22Liu+D%22">Liu D</searchLink>; China Tobacco Standardization Research Center, Zhengzhou Tobacco Research Institute, 2 Fengyang Road, Gaoxin District, Zhengzhou City, Henan Province 450000, China.<br /><searchLink fieldCode="AU" term="%22Jin+Y%22">Jin Y</searchLink>; School of Environment, Tsinghua University, Beijing 100084, China. Electronic address: jinyy@mail.tsinghua.edu.cn.<br /><searchLink fieldCode="AU" term="%22Tan+X%22">Tan X</searchLink>; South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China.<br /><searchLink fieldCode="AU" term="%22Cai+B%22">Cai B</searchLink>; South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China.<br /><searchLink fieldCode="AU" term="%22Ren+T%22">Ren T</searchLink>; South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China.<br /><searchLink fieldCode="AU" term="%22Shi+L%22">Shi L</searchLink>; South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China.<br /><searchLink fieldCode="AU" term="%22Luo+B%22">Luo B</searchLink>; South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China.
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  Data: <searchLink fieldCode="JN" term="%229884362%22">Waste management (New York, N.Y.)</searchLink> [Waste Manag] 2026 Oct 30; Vol. 226, pp. 115796. <i>Date of Electronic Publication: </i>2026 Aug 26.
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  Data: <i>Publisher: </i><searchLink fieldCode="PB" term="%22Pergamon+Press%22">Pergamon Press </searchLink><i>Country of Publication: </i>United States <i>NLM ID: </i>9884362 <i>Publication Model: </i>Print-Electronic <i>Cited Medium: </i>Internet <i>ISSN: </i>1879-2456 (Electronic) <i>Linking ISSN: </i><searchLink fieldCode="IS" term="%220956053X%22">0956053X </searchLink><i>NLM ISO Abbreviation: </i>Waste Manag <i>Subsets: </i>MEDLINE
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  Data: <i>Original Publication</i>: New York : Pergamon Press, c1989-
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  Data: <searchLink fieldCode="MM" term="%22Coal+Ash%22">Coal Ash*</searchLink>/<searchLink fieldCode="MM" term="%22Coal+Ash+chemistry%22">chemistry</searchLink> <br /><searchLink fieldCode="MM" term="%22Chlorine%22">Chlorine*</searchLink>/<searchLink fieldCode="MM" term="%22Chlorine+analysis%22">analysis</searchLink> <br /><searchLink fieldCode="MM" term="%22Chlorine%22">Chlorine*</searchLink>/<searchLink fieldCode="MM" term="%22Chlorine+chemistry%22">chemistry</searchLink> <br /><searchLink fieldCode="MM" term="%22Metals%2C+Heavy%22">Metals, Heavy*</searchLink>/<searchLink fieldCode="MM" term="%22Metals%2C+Heavy+analysis%22">analysis</searchLink> <br /><searchLink fieldCode="MM" term="%22Metals%2C+Heavy%22">Metals, Heavy*</searchLink>/<searchLink fieldCode="MM" term="%22Metals%2C+Heavy+chemistry%22">chemistry</searchLink> <br /><searchLink fieldCode="MM" term="%22Solid+Waste%22">Solid Waste*</searchLink>/<searchLink fieldCode="MM" term="%22Solid+Waste+analysis%22">analysis</searchLink> <br /><searchLink fieldCode="MM" term="%22Incineration%22">Incineration*</searchLink> <br /><searchLink fieldCode="MM" term="%22Cathode+Ray+Tube%22">Cathode Ray Tube*</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Municipal solid waste incineration fly ash (MSWI FA) poses great resource utilization challenges due to contained high concentration of heavy metals (HMs) and chlorine (Cl). In this study, lightweight aggregates (LWAs) were produced using FA and waste cathode ray tubes (CRT). The influences of sintering temperature and phosphates addition on HMs and Cl volatilization, pore structure and mineral phase evolution were investigated. When the mass ratio of FA to CRT was 7:3 and sintering temperature ranged from 1150 to 1200 °C, the removal efficiencies of lead (Pb), zinc (Zn) and cadmium (Cd) all exceeded 90%, whereas that of copper (Cu) surpassed 65%. The secondary fly ash (SFA) is rich in Cl and HMs, endowing it with promising potential for resource recovery. Phosphates had a negligible effect on the volatilization of HMs at high temperatures; however, they suppressed chlorine release via the formation of chlorapatite. As Ca<subscript>3</subscript>(PO<subscript>4</subscript>)<subscript>2</subscript> dosage increased from 0 to 10%, Cl removal rates decreased from 95.86% to 85.28%, but the water-soluble Cl content in sintered products remained lower than 2%. The incorporation of CRT facilitated sintering at reduced temperatures. With SiN employed as a foaming agent, the total porosity rose markedly as the sintering temperature elevated, reaching at the maximum value of 68.67% under the FA:CRT mass ratio of 7:3 at 1200 °C. Environmental risk assessment verified that the sintered LWAs present low ecological risk.<br /> (Copyright © 2026. Published by Elsevier Ltd.)
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  Data: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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  Data: <i>Keywords: </i>Chlorine; Heavy metals; Lightweight aggregates; Municipal solid waste incineration fly ash; Powder sintering process; Waste cathode ray tubes
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  Data: 0 (Coal Ash)<br />4R7X1O2820 (Chlorine)<br />0 (Metals, Heavy)<br />0 (Solid Waste)
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        Text: English
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      – SubjectFull: Chlorine analysis
        Type: general
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