Investigations of sequential leaching behaviour of Cu and Zn from coal fly ash and their mobility in environmental conditions

Sočo, Eleonora; Kalembkiewicz, Jan

doi:10.1016/j.jhazmat.2006.11.046

Cited by 56 publications

(29 citation statements)

References 17 publications

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“…The mobile fraction of Cu in environmental conditions has been estimated at 2.6% (Soco and Kalembkiewicz, 2007). TCLP results yielded 0.5-3% Cu extractable for alkaline fly ash (Ward et al, 2003).…”

Section: Coppermentioning

confidence: 99%

“…As an amphoteric metal, its solubility against pH follows a U-shaped curve, reaching a minimum in the pH 8-10 region (Figure 1). The leachability of Zn in water for alkaline fly ash varies widely, commonly 0.02-0.2 mg/kg and in all cases below 1 mg/kg but over the detection limit (Izquierdo et al, 2011;Moreno et al, 2005;Soco and Kalembkiewicz, 2007). Extractable proportions obtained from a number of water-based leaching tests conducted on Australian and EU alkaline fly ashes consistently ranged between 0.02 and 0.2% (Kim and Hesbach, 2009;Moreno et al, 2005;Ward et al, 2003).…”

Section: Zincmentioning

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

625

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: Coppermentioning

confidence: 99%

Section: Zincmentioning

confidence: 99%

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

Izquierdo

Querol

2012

International Journal of Coal Geology

625

379

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“…Fly ash is rich in aluminum and iron oxides, and is thought to be very important source of pre-mined material, hence many researchers have studied the ash leachability under the acidic conditions for the extraction of alumina, iron, and the other heavy metal elements (Matjie et al, 2005;Baba and Kaya, 2004;Sočo and Kalembkiewicz, 2007). When fly ash contacts with hydrochloric acid, most of the metals, such as Fe and Al, can leach into the solution through the following reactions:…”

Section: Loading Mechanismsmentioning

confidence: 99%

Arsenic (V) removal from aqueous system using adsorbent developed from a high iron-containing fly ash

Zhang

Xiu

2009

Science of The Total Environment

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“…The confirmed presence and mobility of heavy metals from fly ash can cause significant environmental problems. [4][5][6] Contamination during disposal of fly ash, as well as interaction of fly ash and heavy metals in the environment is very limited. [7][8][9] The chemical composition of fly ash -abundance of amorphous aluminosilicate glass, which is the prevalent reactive phase, is what makes fly ash an important source material in zeolite synthesis.…”

Section: Introductionmentioning

confidence: 99%

Removal of Copper(II) and Zinc(II) Ions From Aqueous Solution by Chemical Treatment of Coal Fly Ash

Sočo¹,

Kalembkiewicz²

2015

Croat. Chem. Acta

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Abstract:The aim of this study was to investigate the chemical modifications of coal fly ash (CFA) treated with HNO3 or ammonium acetate (AcNH4) or NaOH or sodium diethyldithiocarbamate (NaDDTC) as an adsorbent for the removal of copper(II) and zinc(II) ions from aqueous solution. The morphology of fly ash grains before and after modification was examined via X-ray diffraction (XRD) and images of scanning electron microscope (SEM). Adsorption of copper(II) and zinc(II) ions was conducted under batch process at different duration, concentrations and temperature of the suspension. Equilibrium experiments shows that the selectivity of CFA-NaOH nanoparticles towards Cu(II) ions is greater than that of Zn(II) ions, which is related to their hydrated ionic radius and first hydrolysis equilibrium constant. The adsorption isotherms were described by Langmuir and Freundlich models. Kinetic data revealed that the adsorption fits well by the pseudo-second-order rate model with high regression coefficients. Thermodynamic parameters suggested that the immobilization Cu(II) and Zn(II) ions onto CFA-NaOH is a spontaneous process. Results demonstrated that the treating coal fly ash with alkaline solution was a promising way to enhance Cu(II) and Zn(II) ions adsorption.

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Investigations of sequential leaching behaviour of Cu and Zn from coal fly ash and their mobility in environmental conditions

Cited by 56 publications

References 17 publications

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

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

Arsenic (V) removal from aqueous system using adsorbent developed from a high iron-containing fly ash

Removal of Copper(II) and Zinc(II) Ions From Aqueous Solution by Chemical Treatment of Coal Fly Ash

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