Fly ash from a Mexican mineral coal. II. Source of W zeolite and its effectiveness in arsenic (V) adsorption

Medina, Adriana; Gamero, Prócoro; Almanza-Robles, J.M.; Vargas, Alfredo; Montoya, J.A.; Vargas‐Gutiérrez, G.; Izquierdo, María

doi:10.1016/j.jhazmat.2010.04.102

Cited by 55 publications

(21 citation statements)

References 53 publications

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“…Zeolites are crystalline hydrated aluminosilicates characterised by a three-dimensional network of tetrahedral (Si,Al)O 4 units that form a system of interconnected pores, which makes these minerals very useful in many applications [17][18][19][20][21][22][23][24]. The use of zeolites synthesised from fly ash (zeolitic fly ash) could be strictly connected with the leaching behaviour of the potentially toxic elements derived from the source material.…”

Section: Introductionmentioning

confidence: 99%

Mobility of trace elements in fly ash and in zeolitised coal fly ash

Belviso

Cavalcante

Gennaro³

et al. 2015

Fuel

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Section: Introductionmentioning

confidence: 99%

Mobility of trace elements in fly ash and in zeolitised coal fly ash

Belviso

Cavalcante

Gennaro³

et al. 2015

Fuel

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“…3c and also confirmed by the BET surface area value which raised from 7 for the ash to 40 and 122 m 2 /g for the Z4 and Z15 samples respectively ( Table 5). The above results signify that the concentration of alkali, temperature, and S:L ratio are, among other factors, important parameters for the kinetics of the nucleation and the crystallization process [22,29]. The thermogravimetric analysis also showed the thermal stability of the new products in the temperature range up to 900°C.…”

Section: Synthesis and Characterization Of The Materialsmentioning

confidence: 60%

“…[18][19][20][21][22]. The type of zeolite formed is a function of temperature, pressure, concentration of alkaline reagent, reaction time and solution/fly ash ratio [23][24][25][26][27][28][29]. The significant number of works presented last years in the literature, on this field, reflects the positive environmental and economic impacts from the recycling of industrial waste.…”

Section: Introductionmentioning

confidence: 99%

New materials synthesized from ash under moderate conditions for removal of toxic and radioactive metals

Noli

Buema

Μisaelides

et al. 2014

J Radioanal Nucl Chem

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Power plant ash was used to synthesize new materials by hydrothermal treatment and ultrasonic activation in an alkaline medium (5 M NaOH) under moderate experimental conditions. The obtained materials were characterized by a variety of techniques (SEM/EDS, INAA, XRD, FTIR, BET). Preliminary investigation of the Ba, Cd, Cr, Cs, Eu and U removal efficiency was performed by batch experiments using radiotracers and spectroscopic techniques as well as desorption studies. The results indicated that the new materials are very efficient in removing the above mentioned metals from aqueous solutions and can be considered as potential low-cost sorbents in environmental technology.

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“…SEM analysis shows that fly ash is predominantly made up of spherical particles [33,43] as shown in Fig. 12.…”

Section: Morphologymentioning

confidence: 99%

Physical, chemical and mineralogical characterisation of hydraulically disposed fine coal ash from SASOL Synfuels

Mahlaba

Kearsley

Kruger³

2011

Fuel

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a b s t r a c tCoal serves as the primary energy source in most parts of the world. It is a fact that coal combustion yields enormous quantities of fly ash some of which are either hydraulically placed or dry dumped. The current study attempts to provide a comprehensive characterisation of a disused alkaline fine coal ash dam (FCAD) towards assessing environmental impact, rehabilitation and utilisation potential. Fine coal ash refers to a combination of approximately 83% power station fly ash and 17% gasification and bottom ash fines (particles <250 lm) at SASOL Synfuels. The hydration products found in Weathered Fine Coal Ash (WFCA) using X-ray Diffraction (XRD) and Differential Scanning Calorimetry (DSC) are analcime, calcite, C-S-H gel, ettringite, hydrated gehlenite (Strätlingite), magnetite, periclase, pyrrhotite and sillimanite. High resolution Scanning Electron Microscope (SEM) results provide additional proof that hydration products are present in WFCA. No indication of appreciable leaching was given by X-ray Fluorescence (XRF) results except calcium and silicon. Thus evidence exists that pollutants from saline brines are immobilised in WFCA and an insight of reaction kinetics was obtained. High content of amorphous phase and lack of alteration in some geotechnical properties suggest that WFCA can be reutilised with lime addition to increase alkalinity and activate pozzolanic reactions.

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Fly ash from a Mexican mineral coal. II. Source of W zeolite and its effectiveness in arsenic (V) adsorption

Cited by 55 publications

References 53 publications

Mobility of trace elements in fly ash and in zeolitised coal fly ash

Mobility of trace elements in fly ash and in zeolitised coal fly ash

New materials synthesized from ash under moderate conditions for removal of toxic and radioactive metals

Physical, chemical and mineralogical characterisation of hydraulically disposed fine coal ash from SASOL Synfuels

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