Characterization of coal fly ash from Israel

Nathan, Y.; Dvorachek, Michael; Pelly, I.; Mimran, U.

doi:10.1016/s0016-2361(98)00144-6

Cited by 69 publications

(42 citation statements)

References 5 publications

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“…However, a number of studies are not consistent with this leaching pattern. Out of the over 30 fly ashes with pH 11-13 reported by Dubikova et al (2006), Izquierdo et al (2011), Moreno et al (2005), Nathan et al (1999) and Ward et al (2003), no sample showed leached levels of Pb exceeding 0.06 mg/kg. Given that Pb metalates have low solubility products, their precipitation under alkaline conditions may attenuate the leaching of Pb (Cornelis et al, 2008) and alter its predicted amphoteric nature.…”

Section: Leadmentioning

confidence: 82%

“…Kim and Kazonich (2004) also reported a dominant silicate association. Pb was found to be highly insoluble and virtually immobile (<1% and often <0.1%) in both acidic and alkaline-natured fly ash samples, irrespective of the pH and the leaching test (Kim et al, 2003;Moreno et al, 2005;Nathan et al, 1999;Praharaj et al, 2002;Ward et al, 2003).…”

Section: Leadmentioning

confidence: 99%

“…Fly ash is, however, depleted in Cd in comparison with other trace elements (except Hg), and this environmentally sensitive element is consistently immobile in near neutral and alkaline conditions. Despite its association with the surface of fly ash particles, the concentrations leached in water rarely surpass 0.01 mg/kg in alkaline natured fly ash (Fruchter et al, 1990;Medina et al, 2010;Moreno et al, 2005;Nathan et al, 1999) while values for acidic fly ash from Australia equate to 0.1 mg/kg at pH4 (Jankowski et al, 2004;Ward et al, 2009). Figure 1 provides an insight into the response of Cd to the pH.…”

Section: Cadmiummentioning

confidence: 99%

“…The concentrations of Hg in leachates are extremely low, in most cases <0.2 µg/L (often <0.02 µg/L), across the 4.5-13 pH range and show no pH dependence (Nathan et al, 1999;Pflughoeft-Hassett, 2004.…”

Section: Mercurymentioning

confidence: 99%

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Leaching behaviour of elements from coal combustion fly ash: An overview

Izquierdo

Querol

2012

International Journal of Coal Geology

624

379

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Coal-based power generation produces over 750 Mt of coal ash per year globally, but under 50% of world production is utilised. Large amounts of fly ash are either stored temporarily in stockpiles, disposed of in ash landfills or lagooned. Coal ash is viewed as a major potential source of release of many environmentally sensitive elements to the environment. This paper encompasses over 90 publications on coal fly ash and demonstrates that a large number of elements are tightly bound to fly ash and may not be easily released to the environment, regardless of the nature of the ash. This review provides an extensive look at the extent to which major and trace elements are leached from coal fly ash. It also gives an insight into the factors underlying the leachability of elements and addresses the causes of the mobility. The mode of occurrence of a given element in the parent coal was found to play an important role in the leaching behaviour of fly ash. The amount of calcium in fly ash exerts a dominant influence on the pH of the ash-water system. The mobility of most elements contained in ash is markedly pH sensitive. The alkalinity of fly ash attenuates the release of a large number of elements of concern such as Cd, Co, Cu, Hg, Ni, Pb, Sn or Zn among others, but at the same time, it enhances the release of oxyanionic species such as As, B, Cr, Mo, Sb, Se, V and W. The precipitation of secondary phases such as ettringite may capture and bind several pollutants such ash As, B, Cr, Sb, Se and V.

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Section: Leadmentioning

confidence: 82%

Section: Leadmentioning

confidence: 99%

Section: Cadmiummentioning

confidence: 99%

Section: Mercurymentioning

confidence: 99%

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Leaching behaviour of elements from coal combustion fly ash: An overview

Izquierdo

Querol

2012

International Journal of Coal Geology

624

379

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“…Iron in an alumino-silicate glass is a characteristic phase found in coal fly ash formed under both oxidizing and reducing conditions. [194][195][196] The presence of large concentrations of alkali and alkali earth elements, typical of western U.S. coals, enhances glass formation and decreases crystallization. …”

Section: Coal-fired Steam Generation Boilersmentioning

confidence: 99%

Combustion Aerosols: Factors Governing Their Size and Composition and Implications to Human Health

Lighty

Veranth

Sarofim

2000

Journal of the Air & Waste Management Association

1,007

600

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Particulate matter (PM) emissions from stationary combustion sources burning coal, fuel oil, biomass, and waste, and PM from internal combustion (IC) engines burning gasoline and diesel, are a significant source of primary particles smaller than 2.5 µm (PM 2.5 ) in urban areas. Combustion-generated particles are generally smaller than geologically produced dust and have unique chemical composition and morphology. The fundamental processes affecting formation of combustion PM and the emission characteristics of important applications are reviewed. Particles containing transition metals, ultrafine particles, and soot are emphasized because these types of particles have been studied extensively, and their emissions are controlled by the fuel composition and the oxidant-temperature-mixing history from the flame to the stack. There is a need for better integration of the combustion, air pollution control, atmospheric chemistry, and inhalation health research communities. Epidemiology has demonstrated that susceptible individuals are being harmed by ambient PM. Particle surface area, number of ultrafine particles, bioavailable transition metals, polycyclic aromatic hydrocarbons (PAH), and other particle-bound organic compounds are suspected to be more important than particle mass in determining the effects of air pollution. Time-and size-resolved PM measurements are needed for testing mechanistic toxicological hypotheses, for characterizing the relationship between combustion operating conditions and transient emissions, and for source apportionment studies to develop air quality plans. Citations are provided to more specialized reviews, and the concluding comments make suggestions for further research.

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Wertstoffgewinnung aus Kraftwerksaschen Teil I: Charakterisierung von Braunkohlenkraftwerksaschen zur Gewinnung strategischer Metalle

Brett

Schrader

Räuchle

et al. 2015

Chemie Ingenieur Technik

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rg Mö gel zum 65. Geburtstag gewidmet Braunkohlenaschen aus Kraftwerken weisen als sekundäre Rohstoffquellen ein bisher weitgehend ungenutztes Potenzial auf. Die Gewinnung von Wertmetallen aus Aschen setzt deren Charakterisierung voraus, auf der eine zielgerichtete Strategie zur Metallextraktion aufbaut. An Filteraschen und Stabilisat aus den Kraftwerken Boxberg und Schwarze Pumpe des Lausitzer Reviers wurden Wege aufgezeigt, wie ausgehend von Charakterisierungsdaten zur Korngrößenverteilung, der Elementund mineralogischen Zusammensetzung sowie dem Verhältnis Netzwerkbildner zu Netzwerkwandler durch gezielte Vorbehandlung eine deutliche Steigerung der Metallmobilisierung durch Laugung mit Salzsäure erhalten werden konnte.The unexploited potential of ashes, especially from lignite combustion in power plants, for the strategic recovery of secondary resources requires a sufficient, substantial and reliable analysis. Thus, information facilitates pathways to dedicated metal extractions and optimized recovery strategies. Based on two fly ashes and a stabilized form, delivered from Lusatia, the characterization, concerning the particle size distribution, elemental and mineralogical composition and the ratio of network former to modifier, led to a significant increase in the mobilization of metals by the leaching of the educts with hydrochloric acid.

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Characterization of coal fly ash from Israel

Cited by 69 publications

References 5 publications

Leaching behaviour of elements from coal combustion fly ash: An overview

Leaching behaviour of elements from coal combustion fly ash: An overview

Combustion Aerosols: Factors Governing Their Size and Composition and Implications to Human Health

Wertstoffgewinnung aus Kraftwerksaschen Teil I: Charakterisierung von Braunkohlenkraftwerksaschen zur Gewinnung strategischer Metalle

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