Characteristics of Brazilian coal fly ashes and their synthesized zeolites

Izidoro, Juliana de Carvalho; Fungaro, Denise Alves; Santos, Fernando S. dos; Wang, Shaobin

doi:10.1016/j.fuproc.2012.01.009

Cited by 83 publications

(66 citation statements)

References 31 publications

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“…As commented previously, the characterization of zeolites in terms of trace elements is relatively unexplored in the literature. 45,59 Most studies 60,61 investigate only the main components (Al, Na and Si) of zeolite structure, with only a few 45,47,48 also characterizing majority elements. The presence of trace elements in zeolites obtained from CFA is even more unusual and only two studies were found.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…[45][46][47][48] To the best of our knowledge, only Belviso et al 45 conducted a complete characterization of CFA and synthetizes zeolites, including determining trace elements, whereas other authors [46][47][48] assessed only major elements. Recent studies conducted by Behin et al 49 related to transfer of trace elements from zeolites NaP type.…”

Section: Introductionmentioning

confidence: 99%

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Integrated Synthesis of Zeolites Using Coal Fly Ash: Element Distribution in the Products, Washing Waters and Effluent

Ferrarini¹,

Cardoso²,

Paprocki³

et al. 2016

Journal of the Brazilian Chemical Society

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Coal fly ash has been proposed as an alternative raw material for zeolite synthesis, however, the mobilization of toxic elements of this material into zeolite products, washing water and effluent is rarely addressed. In this study, Brazilian coal fly ash was used in the integrated synthesis (two steps) of zeolites Na-P1 and 4A and the distribution of approximately 40 major, minor and trace elements was investigated in all the input and output flows involved in the process. The mobilization of several elements was observed in the zeolite products, a number of which are highly toxic, such as As, Cd, Cr, Ni and Pb. With regard to the amount present in the ash, both zeolites were enriched in several elements, such as Ni in zeolite Na-P1 and As in zeolite 4A. The latter exhibited high purity, with most of the elements investigated having concentrations close to those measured in commercial zeolite 4A. Important information was gathered regarding zeolite synthesis using fly ash, which will ensure safer application of these materials and, if necessary, propose a contaminant-free synthesis route.

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Section: Chemical Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Integrated Synthesis of Zeolites Using Coal Fly Ash: Element Distribution in the Products, Washing Waters and Effluent

Ferrarini¹,

Cardoso²,

Paprocki³

et al. 2016

Journal of the Brazilian Chemical Society

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“…The methods are widely recognized as single-step and two-step hydrothermal. In the single-step hydrothermal processing, crystal variety in the end zeolite products became the major drawbacks of this method [11][12][13] . In the twostep hydrothermal processing, only the liquid alkali extracts from y ash were used in the production of the zeolite, which leaves behind yet another solid waste product and gives a very low production yield [14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

et al. 2016

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Acid-extracting residue of circulating uidized bed (CFB) y ash is still underutilized leaving disposal problems. In fact, high silica content inside this material opens a possibility to become a potential zeolites precursor. In this study, ne particles of acid residues have been reused to prepare zeolite Na-X and Na-P with high purity and intensity. Acid residue was used to synthesize zeolite Na-X and Na-P using a single-step hydrothermal process. The effects of crystallization time, temperature and sodium hydroxide concentration on the end products were investigated. The results revealed that crystallization time and temperature determined whether or not zeolite Na-X or Na-P was formed. The zeolites were characterized in terms of their mineralogical composition, morphology, and fourier-transform infrared spectroscopy.

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“…However, more interesting is its future possible application, as an adsorbent for various pollutants (including radioactive elements and heavy metals). It has been demonstrated that, manufacture of synthetic zeolites from CFA is a relatively straightforward procedure [18][19][20][21][22] and such materials have been found to be effective in the removal of various pollutants from different environments (water, soils, flue gases) [15,[23][24][25][26][27][28][29]. A comparison with natural zeolites shows that synthetic zeolites are better for the removal of mercury compounds, due to the consistent size of the channels and chambers, in contrast to the microstructure of natural zeolites sizes which can be variable and often associated with a number of lattice defects [30].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of mercury removal from exhaust gases

Wdowin

Wiatros-Motyka

Panek

et al. 2014

Fuel

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An initial study has been made of the use of synthetic zeolites for mercury capture from exhaust gases. Synthetic zeolites (Na-X and Na-P1), and for comparison a natural zeolite (clinoptilolite) and activated carbon with bromine (AC/Br) were tested for mercury uptake from a gaseous stream. The materials were subjected to mercury adsorption tests and their thermal stability was evaluated. The untreated synthetic zeolites had negligible mercury uptake, but after impregnation with silver, the adsorption of mercury was markedly improved.The synthetic zeolite Na-X impregnated with silver adsorbed significantly more mercury before breakthrough than the activated carbon impregnated with bromine, indicating the potential of zeolite derived from coal fly ash as a new sorbent for capture of mercury from flue gases.

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Characteristics of Brazilian coal fly ashes and their synthesized zeolites

Cited by 83 publications

References 31 publications

Integrated Synthesis of Zeolites Using Coal Fly Ash: Element Distribution in the Products, Washing Waters and Effluent

Integrated Synthesis of Zeolites Using Coal Fly Ash: Element Distribution in the Products, Washing Waters and Effluent

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

Experimental study of mercury removal from exhaust gases

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