Recovery of zinc and lead from fly ash from ash-melting and gasification-melting processes of MSW – Comparison and applicability of chemical leaching methods

Okada, Takashi; Tojo, Yasumasa; Tanaka, Nobutoshi; Matsuto, Toshihiko

doi:10.1016/j.wasman.2005.12.006

Cited by 85 publications

(42 citation statements)

References 3 publications

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“…In 2001, as much as 80% of the 52 million tons of generated MSW was incinerated (Okada et al, 2006). Although the process is very effective in reducing the volume of waste by about 80-90%, it suffers from a disadvantage of generating solid reaction byproducts (fly ash and bottom ash) which require pretreatment before landfilling to immobilize the hazardous metals and to decompose the dioxins in the ash.…”

Section: Introductionmentioning

confidence: 99%

“…It is gaining popularity nowadays due to its simple operation and lowenergy requirement. Various methods using different leaching reagents have been investigated (Nagib et al, 2000;Okada et al, 2006;Hong et al, 2007;Izumikawa, 1996;Wu et al, 2006;Wan et al, 2006;Zhang et al, 2006;Katsuura et al, 1996). These methods usually employ leaching, using acid, alkaline or other reagents, filtration and then chemical precipitation to recover the dissolved metals in the pregnant solution.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…The high concentration of valuable metals makes the secondary fly ash worthy to be reclaimed. A previous study showed that Pb and Zn could be recovered through chemical leaching methods (Okada et al, 2007). Therefore, the particulate phase can be regarded as valuable resource instead of hazardous materials only.…”

Section: Analysis Of Surface and Crystalline Characteristicsmentioning

confidence: 99%

Metal Behavior during Vitrification of Municipal Solid Waste Incinerator Fly Ash

Kuo

Huang

Lin

2012

Aerosol Air Qual. Res.

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This study described the mass distribution of metals and the crystalline characteristics of slag during the vitrification of incinerator fly ash. The fly ash, mainly composed of Ca (180,000 mg/kg), Si (25,500 mg/kg), Pb (19900 mg/kg), and Zn (14,400 mg/kg), was vitrified with cullet at a basicity of 0.921 in an electric heating furnace. After vitrification, metals with low boiling points (Cd, Pb, and Zn) vaporized into flue gas as particulate phase. High levels of Pb (315,000 mg/kg) and Zn (226,000 mg/kg) made the particulate phase worth reclaiming. No ingot formed due to lack of ingot forming metals, and thus metals with high boiling points mainly stayed in the slag. After being identified by X-ray diffractometer (XRD) analysis, the major crystalline phases of the slag were found to be Ca 2 SiO 4 and CaSiO 3 , which coincided with the results of scanning electron microscopy (SEM). The results of the toxicity characteristics leaching procedure (TCLP) suggest that recycling the slag could be taken into consideration. The overall results indicate that vitrification is a promising technology that is able to transform incinerator fly ash into stable slag, reduce secondary environmental pollution, and transform valuable metals (Pb and Zn) in a recoverable form.

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“…The waste generated from MSW incineration is usually used in one of two ways: disposed as landfill or for reuse as secondary raw materials. Because land is scarce and environmental controls are tight in Japan, environmental policies tend to reduce landfill disposal to the greatest degree possible (Jung et al, 2004;Okada et al, 2007;Sakai, 1996).…”

Section: Introductionmentioning

confidence: 99%

Immobilization and volume reduction of heavy metals in municipal solid waste fly ash using nano-size calcium and iron-dispersed reagent

Mallampati

Mitoma

Simion

et al. 2015

Journal of the Air & Waste Management Association

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Recovery of zinc and lead from fly ash from ash-melting and gasification-melting processes of MSW – Comparison and applicability of chemical leaching methods

Cited by 85 publications

References 3 publications

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

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

Metal Behavior during Vitrification of Municipal Solid Waste Incinerator Fly Ash

Immobilization and volume reduction of heavy metals in municipal solid waste fly ash using nano-size calcium and iron-dispersed reagent

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