Mössbauer spectroscopic studies of the mineralogical changes in coal as a function of cleaning, pyrolysis, combustion and coalconversion processes

Saporoschenko, M.; Hinckley, C.C.; Smith, Gerard V.; Twardowska, Helena; Shiley, R.H.; Griffin, Robert A.; Russell, S.J.

doi:10.1016/0016-2361(80)90234-3

Cited by 16 publications

(7 citation statements)

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“…Although the more unusual Fe containing phases suggested by the X-ray diffraction analysis cannot be ruled out, these parameters are very similar to those of szomolnokote, FeSO,. Hz0 (Huffman and Huggins, 1978;Saporoschenko et al, 1980). The results of fitting the spectra of the samples listed in Table 1 and 2 to quadrupole doublet patterns are given in Table 3.…”

Section: Resultsmentioning

confidence: 99%

“…THERE have been several reports of 57Fe Mossbauer investigations of pyrite as a synthetic compound (Vaughan and Drickamer, 1967;Nishihara and Ogawa, 1979) as a pure mineral (Temperley and Lefevre, 1966;Morice el ai., 1969) and as a component of assemblages of iron-containing phases in coals (Huffman and Huggins, 1978;Saporoschenko et at., 1980). The Mossbauer parameters reported thus far have a spread in values (0.59 mm SC' cr AE, 5 0.65 mm s-') far greater than that of +O.Ol mm s-' expected for a pure, stoichiometric, Fe&, pyrite phase.…”

Section: Introductionmentioning

confidence: 99%

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The 57Fe Mössbauer parameters of pyrite and marcasite with different provenances

Evans

Johnson

Senftle

et al. 1982

Geochimica et Cosmochimica Acta

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Eighteen pyrite and twelve marcasite samples which have different provenances have been investigated to determine the systematics of the influence of mineralogical and geological factors on the "Fe Miissbauer spectra at 298 K. The following results have been obtained: there is no ambiguity in distinguishing single phase pyrite from single phase marcasite by means of "Fe Miissbauer spectroscopy at 298 K. At 298 K the average electric quadrupole splitting, (AEo), and average isomer shift, (6), with respect to Fe metal, are 0.61 IO It 0.0030 mm SC' and 0.313 f 0.008 mm s-', respectively, for the I8 pyrites; (A&) = 0.5030 ? 0.0070 mm s-' and (a) = 0.2770 + 0.0020 mm s-r for the I2 marcasites. At 77 K, AE, is 0.624 mm s-' for pyrite and 0.508 mm s-' for marcasite. In distinguishing pyrites from marcasites, spectra obtained at 77 K are not warranted. The Mdssbauer parameters of pyrite and marcasite exhibit appreciable variations, which bear no simple relationship to the geological environment in which they occur but appear to be selectively influenced by impurities, especially arsenic, in the pyrite lattice. Quantitative and qualitative determinations of pyrite/marcasite mechanical mixtures are straightforward at 298 K and 77 K but do require least-squares computer fittings and are limited to accuracies ranging from lt5 to 215 per cent by uncertainties in the parameter values of the pure phases. The methodology and results of this investigation are directlv aDDlicable to coals for which the Dresence and relative amounts of pyrite and marcasite could he of considerable genetic significance.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The 57Fe Mössbauer parameters of pyrite and marcasite with different provenances

Evans

Johnson

Senftle

et al. 1982

Geochimica et Cosmochimica Acta

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“…Furthermore, motivated by the need to compare the degree of mineral alteration by the usual (RF) and proposed (MW) ashing procedures, changes in the iron minerals due to ashing are analyzed by the use of Mossbauer spectroscopy. This nuclear gammaray resonance technique has been employed in coal and coal product analysis in this (Williamson, Guettinger, Dickerhoof, 1980) and other laboratories (Montano, 1979;Huffman and Huggins, 1978;Saporoschenko, et. al., 1980;Jacobs and Levinson, 1979;Montano, 1980) where it has been shown to be a powerful tool which complements chemical analysis for identifying and monitoring changes in the iron minerology.…”

Section: Discussionmentioning

confidence: 99%

Atomic and Nuclear Methods in Fossil Energy Research

Eilby¹,

Carpenter²,

Ragaini³

1982

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All rights reserved 81-21169 AACR2No part of this book may be reproduced , stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, microfilming, recording , or otherwise , without written permission from the Publisher v vi mass spectroscopy photoelectron spectroscopy gamma-ray spectroscopy radioactive tracer studies electron microprobe analysis nuclear magnetic resonance spectroscopy PREFACE These papers were arranged into sessions according to the following major problem areas:methods of elemental analysis investigations of mechanisms and structures characterization of speciesThe problem areas were keynoted by excellent plenary state-of-theart review papers given by J. W. Fruchter, well-known authorities in their fields. The contributed papers followed by presenting recent experimental results in those areas reviewed in the plenary papers.This conference provided an l!llusual opportunity for attendees with expertise and interests in the diverse areas of atomic analytical techniques and nuclear analytical techniques to communicate together and discuss topics of mutual interest. We feel these discussions were very fruitful and educational for all the attendees and will lead to beneficial collaborations in the future. , members of the Technical Committee.The editors would like to acknowledge the unselfish giving of time and talent of those whose help made this conference a success. We wish to express our added appreciation to the session chairmen for their overall contributions: PREFACE vii son of Washington State University. A special thanks is extended to S. Hendrickson of Lawrence,Livermore National Laboratory for the compilation and preparation of the abstracts.Although proper prearrangements are critical to any meeting, implementation is equally critical. For the invaluable on-site assistance we received during the various phases of the conference, we are indebted to many, but especially to K. B. Pedersen for arranging so much of the local assistance. We are indebeted specifically to the staff of the Center for Energy and Environment Research; S. E. Alemany, Chancellor, University of Puerto Rico -Mayaguez Campus; and M. Vargas-Cesani, Recinto Universitario de Mayaguez. We wish to express our appreciation to D. Bennett, C. Filby and N. Wogman for coordination of all the last minute crises, both before and during the meeting. Finally, we would like to thank R. E. Sinclair, Applied Physics Technology, for organizing the coffee breaks which were sponsored by Canberra, ORTEC, Nicolet, and Nuclear Data.The location of the conference, Mayaguez, Puerto Rico, not only provided an excellent secluded atmosphere for informal working groups to be formed, but also was an equally enjoyable and superb setting for those who accompanied the attendees. The location was surpassed only by the cordiality of the hosts, J. Guzman, H. J. Santiago, J. A. Petrillo and staff, at the Mayaguez Hilton, the conference hotel. Competing with scenery and cordiality of the hotel was the ex...

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“…This spectroscopy provides useful information on the qualitative and quantitative occurrences of Fe-bearing minerals and amorphous phases in coal. ,,,,,− The Fe 2+ /Fe 3+ ratio, crystal data peculiarities, and solid solutions in Fe-containing coal minerals and phases can also be characterized. For example, these data can be used for a detection of the oxidation and weathering levels of Fe sulfides to Fe 2+ and Fe 3+ sulfates, and later to Fe oxyhydroxides. ,,− Transformations of Fe minerals following other treatments have been studied as well. ,,− The MS has also been proposed as an alternative to wet chemical methods for pyrite analysis in coal. ,,− The application and perspectives of this technique for coal characterization have been recently reviewed …”

Section: Mössbauer Spectroscopy (Ms)mentioning

confidence: 99%

Methods for Characterization of Inorganic and Mineral Matter in Coal: A Critical Overview

2003

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The present state of the methods commonly used for inorganic and mineral matter characterization in coal is described and summarized. The application of various separation procedures, macroscopic observations, reflected and transmitted optical microscopy, scanning and transmission electron microscopy, X-ray diffraction, differential thermal and thermogravimetric analyses, Mössbauer spectroscopy, infrared spectroscopy, and chemical analyses are briefly discussed. A short critical overview on the advantages and limitations of the above listed methods as well as some recommendations during their utilization are also presented.

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Mössbauer spectroscopic studies of the mineralogical changes in coal as a function of cleaning, pyrolysis, combustion and coalconversion processes

Cited by 16 publications

References 12 publications

The 57Fe Mössbauer parameters of pyrite and marcasite with different provenances

The 57Fe Mössbauer parameters of pyrite and marcasite with different provenances

Atomic and Nuclear Methods in Fossil Energy Research

Methods for Characterization of Inorganic and Mineral Matter in Coal: A Critical Overview

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