Municipal solid waste incinerator residue recycling by thermal processes

Sakai, Shin-ichi; Hiraoka, Masakatsu

doi:10.1016/s0956-053x(99)00315-3

Cited by 230 publications

(129 citation statements)

References 7 publications

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“…the extraction percentages of Ca and Pb by H 2 SO 4 were 7.85% and 2.82%, compared to those of around 77% and 58% by HCl and HNO 3 , respectively. Similar extraction effects for HCl and HNO 3 were found with the exception of the lower extraction percentages for V, Cr and Ni by HNO 3 . In addition, it is understood that hydrochloric acid is easy to handle at low cost, hence we recommend this acid as extraction reagent for fly ash.…”

Section: Acid Selectionsupporting

confidence: 75%

“…melting treatment, chemical stabilization, cement solidification, or extraction. Converting the ash into slag by melting process has been improved in recent years since the melted slag has the potential to be used as construction materials such as aggregates and ceramic linings [2,3]. The only shortcoming of this process is that it is much more costly compared with other methods, which makes it difficult for exact application.…”

Section: Introductionmentioning

confidence: 99%

“…To date, various hydrometallurgical methods using lixiviation reagents for metal extraction from waste ashes have been examined [6][7][8]. Among the reagents, mineral acids such as HCl, HNO 3 , H 2 SO 4 , and alkaline solutions such as NaOH and aqueous NH 3 , are frequently employed. Hydrochloric acid and nitric acid have the advantages of extracting almost all metallic elements, and sulfuric acid could dissolve many of the metals but leave Ca and Pb in the residue, while alkaline solutions have the advantages of selective extraction of amphoteric metals such as Zn and Pb and leave other metals in the solid residue.…”

Section: Introductionmentioning

confidence: 99%

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Extraction of metals from municipal solid waste incinerator fly ash by hydrothermal process

Zhang

Itoh

2006

Journal of Hazardous Materials

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This work examined the extraction properties of metallic elements from municipal incinerator fly ash under hydrothermal conditions. The ash was firstly pre-washed by distilled water, then subjected to hydrothermal treatments. The pre-washing process was effective for Na, K, Ca extraction with extraction percentages of 67%, 76% and 48%, respectively. The optimum contact time was 30 min for the pre-washing process. Five types of acids were tested for the extraction experiments and hydrochloric acid was found to be most effective for metal extraction from the ash. Compared to room condition, hydrothermal treatment accelerated the dissolution of the ash, thus promoted the reaction of acid with hazardous metals such as Cr, Cd, Pb, and furthermore, the consumption speed of acid was slowed down under hydrothermal condition. The acid simultaneously reacted with all the metal in the ash under hydrothermal condition but preferentially reacted with Ca at room condition. The optimum hydrothermal treatment temperature, time and liquid/solid ratio were 150• C, 5 h and 10:1 (ml:g), respectively.

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Section: Acid Selectionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Extraction of metals from municipal solid waste incinerator fly ash by hydrothermal process

Zhang

Itoh

2006

Journal of Hazardous Materials

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“…The melting process of MSW incineration residue produces about 6-10% MFA of the total input (Sakai et al, 2000). As of 2004, 144 melting plants were in operation in Japan, generating about 0.2 million tons of MFA annually (Japan Waste Research Foundation, 2006).…”

Section: Introductionmentioning

confidence: 99%

Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier

Alorro

Mitani

Hiroyoshi

et al. 2008

Minerals Engineering

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Municipal solid waste (MSW) molten fly ash is classified as a hazardous waste because it contains considerable amount of heavy metals, which pose environmental concern due to their leaching potential in landfill environments. This study proposes Carrier-in-Pulp (CIP) method as a new hydrometallurgical route to extract and recover Pb, Zn, Cu, and Cd from molten fly ash before landfilling. In this method, a carrier material, which recovers the extracted metals, is added simultaneously with fly ash to a leaching solution and is harvested from the pulp by physical separation method, such as magnetic separation or sieving.To demonstrate the effect of the CIP method, shaking flask experiments were conducted under various conditions using NaCl solution, iron powder as carrier, and molten fly ash. More than 99 wt% Pb, Zn, and Cd, and 97 wt% Cu were extracted from the ash.

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“…The kinetics of evaporation of Cd, Pb, Cu, Zn from a MSW fly ash were 4 determinated in different atmospheres between 670 and 1300 °C [14,15]. Moreover, Sakai and Hiraoka [16] have investigated the distribution of metals between melted slag, gas cooler ash and bag filter ash obtained after direct melting of fly ashes at 1400 °C. Finally, leaching characteristics of melted slag have been documented by Lin and Chang [17].…”

Section: Introductionmentioning

confidence: 99%

High temperature behavior of electrostatic precipitator ash from municipal solid waste combustors

Forestier

Libourel

2008

Journal of Hazardous Materials

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To cite this version:Lydie Le Forestier, Guy Libourel. High temperature behavior of electrostatic precipitator ash from municipal solid waste combustors. Journal of Hazardous Materials, Elsevier, 2008, 154, pp.373-380 AbstractMunicipal solid waste (MSW) flue gas residues require further treatment prior to disposal or reuse, and vitrification is one of the main solidification-stabilization processes. This paper investigates the high temperature behavior of MSW flue gas residues, performed in laboratory experiments up to 1400°C, and coupled with thermogravimetric analyses, X-ray diffraction, chemical and electron microprobe analyses. Melting temperatures of electrostatic precipitator (ESP) ash are in the range of 1202-1272 °C, whereas semi-dry scrubber residues melt between 1900 and 2300 °C. We show that the mean liquidus temperature of flue gas residues can be simply evaluated from their CaO content, by using the CaO-SiO 2 -Al 2 O 3 ternary diagram. For ESP ash, the liquidus phase is a Zn-rich aluminous spinel, followed by anorthite at 1225 °C, and melilite at 1190 °C. The total mass loss reaches 18 wt.% at 1300 °C. Moreover, 90% of evaporation takes place below 1000 °C, linked to evaporation of C, Cl, S, Na, K, and of the toxic metals Hg, Cd, Pb, Cu. Due to the high partial pressure of chlorine during heating, chloride is the most probable form of evaporation for Cd, Pb, and Cu. However, most of Zn, Cr, Ni, Sb and Sn remain in the vitrified product.

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Municipal solid waste incinerator residue recycling by thermal processes

Cited by 230 publications

References 7 publications

Extraction of metals from municipal solid waste incinerator fly ash by hydrothermal process

Extraction of metals from municipal solid waste incinerator fly ash by hydrothermal process

Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier

High temperature behavior of electrostatic precipitator ash from municipal solid waste combustors

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