Abstract
The use of a microwave discharge to activate oxygen for the low temperature ashing of coal is being tested. The effect of low temperature ashing (LTA) by the normal radiofrequency procedure and this new microwave procedure upon the Fe-S compounds is monitored by the use of 57Fe Mössbauer spectroscopy. Results show that the microwave technique, like the normal LTA procedure, effectively ashes the coal without the oxidation of pyritic sulfur. Dehydration of iron sulfates and oxidation of Fe2+ to Fe3+ in sulfates occurs in both ashing procedures under the conditions tested. Separate experiments show that dehydration is caused by sample heating rather than by reaction with the activated oxygen. The Mossbauer recoilless fractions of the Fe-sulfates observed in this study are found to be only about half that of pyrite.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Frazer, F.W. and Belcher, C.B., 1973, Quantitative determination of the mineral-matter content of coal by a radiofrequency-oxidation technique, Fuel, 52: 41.
Given, P.H. and Yarzab, R.F., 1978, Analysis of the organic substance of coals: problems posed by the presence of mineral matter, in: “Analytical Methods for Coal and Coal Products,” Vol. 11, C. Karr, Jr., ed., Academic Press, New York.
Gladfelter, W.L. and Dickerhoof, D.W., 1976, Determination of sulfur forms in hydrodesulfurized coal, Fuel, 55: 360.
Gluskoter, H., 1965, Electronic low-temperature ashing of bituminous coal, Fuel, 44: 285.
Hamersma, J.W. and Kraft, M.L., 1979, Coal Sulfur Measurements, EPA-600/7-79-150.
Huffman, G.P. and Huggins, F.E., 1978, Mossbauer studies of coal and coke: quantitative phase identification and direct determination of pyritic and sulphide sulphur content, Fuel, 57: 592.
Huggins, F.E. and Huffman, G.P., 1979, Mossbauer analysis of iron-
bearing phases in coal, coke, and ash, in: “Analytical Methods for Coal and Coal Products,” Vol. Ill, C. Karr, Jr., ed., Academic Press, New York.
Jacobs, T.S. and Levinson, L.M., 1979, Enhancement of magnetic separability in coal liquefaction residual solids, J. Appl. Phys., 50: 2422.
Jenkins, R.G. and Walker, P.L., Jr., 1978, Analysis of mineral matter in coal, in: “Analytical Methods for Coal and Coal Products,” Vol. II, C. Karr, Jr., ed., Academic Press, New York.
Miller, R.N., Yarzab, R.F., and Given, P.H., 1979, Determination of the mineral-matter contents of coals by low-temperature ashing, Fuel, 58: 4.
Montano, P., 1979, Characterization of iron bearing minerals in coal, in: “Preprints Amer. Chem. Soc.-Div. Fuel Chem.,” 24: 218.
Montano, P.A., 1980, Application of Mossbauer spectroscopy to coal characterization and utilization, in: “Recent Chemical Applications of Mossbauer Spectroscopy,” A.C.S. Symposium Series, C.K. Shenoy and V.G. Stevens, ed., American Chemical Society, Washington, D.C., in press.
Palache, C., Berman, H., Frondel, C., 1951, “Dana’s System of Minerology,” Vol. II, John Wiley and Sons, New York.
Paris, B., 1977, The direct determination of organic sulfur in raw coals, in: “Coal Desulfurization, Chemical and Physical Methods,” A.C.S. Symposium Series 64, T.D. Wheelock, ed., American Chemical Society, Washington, D.C.
Saporoschenko, Mykola, Hinckley, C.C., Smith, G.V., Twardowska, H., Shiley, R.H., Griffin, R.A., and Russell, S.J., 1980, Mossbauer spectroscopic studies of the mineralogical changes in coal as a function of cleaning, pyrolysis, combustion and coal-conversion processes, Fuel, 59: 567.
Weast, Robert C., ed., 1977–78, “CRC Handbook of Chemistry and Physics,” 58th edition, CRC Press, Inc., Florida.
Williamson, D.L., Guettinger, T.W., and Dickerhoof, D., Quantitative investigations of coal, in: “Recent Chemical Applications of Mössbauer Spectroscopy,” A.C.S. Symposium Series, C.K. Shenoy and V.G. Stevens, ed., American Chemical Society, Washington, D.C., in press.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1982 Plenum Press, New York
About this chapter
Cite this chapter
Giulianelli, J.L., Williamson, D.L. (1982). Sulfur Forms Determination in Coal Using Microwave Discharge Activated Oxygen and Mössbauer Spectroscopy. In: Filby, R.H., Carpenter, B.S., Ragaini, R.C. (eds) Atomic and Nuclear Methods in Fossil Energy Research. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-4133-8_30
Download citation
DOI: https://doi.org/10.1007/978-1-4684-4133-8_30
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4684-4135-2
Online ISBN: 978-1-4684-4133-8
eBook Packages: Springer Book Archive