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Maceral/microlithotype analysis of the Hardgrove grindability of lithotypes from the Phalen coal bed, Cape Breton, Nova Scotia

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Abstract

Three lithotypes of Phalen coal from Cape Breton County, Nova Scotia, Canada, were subjected to a modified Hardgrove grindability index (HGI) test. The testing scheme differed from conventional (ASTM D-409) Hardgrove testing by, in one case, repeating the test three times prior to removing the -200-mesh fine coal from the Hardgrove mill, and, in a second test, removing fines after each of three successive Hardgrove tests. Only the first stage of the latter testing scheme actually conforms to the standard HGI test. All processed samples were analyzed petrographically by a combined maceral/microlithotype analysis.

The increase in the percentage of coal ground to -200 mesh increases through the 60- to 180-mesh fractions for each of the lithotypes for the following two apparent reasons: First, with progressive grinding, more of the oversize material is close to 200 mesh (75 μm), creating a “pool” of particles ready to be ground to -200 mesh, and, second, the removal of fines from the system at each step eases the grinding at the successive step. The fines retained system shows the influence of buffering of further grinding by the particles retained in the grinding mill. The Phalen lithotypes and the series of Central Appalachian coals, evaluated previously by Hower and Wild (1994), differ in that an increase in vitrite and a decrease in trimacerite is observed in successive -200-mesh fractions in two of the Phalen lithotypes. This is the opposite of the trend observed in the slightly lower-rank Central Appalachian coals.

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References

  • Center for Applied Energy Research (CAER), 1996, ongoing and unpublished studies.

  • Chandra, U., and Maitra, A., 1976, “A study on the effect of vitrinite content on coal pulverization and preparation,” Jour. Indian Academy of Geosciences, 19(2), p. 9.

    Google Scholar 

  • Hower, J.C., Graese, A.M., and Klapheke, J.G., 1987, “Influence of microlithotype composition on Hardgrove grindability for selected eastern Kentucky coals,” Int. Jour. Coal Geology, 7, p. 227.

    Article  Google Scholar 

  • Hower, J.C., Robl, T.L., Rathbone, R.F., Schram, W.H., and Thomas, G.A., 1997, Characterization of Pre- and Post-NOx Conversion Fly Ash from the Tennessee Valley Authority’s John Sevier Fossil Plant, American Coal Ash Association, Orlando, FL, in press.

  • Hower, J.C., and Wild G.D., 1988, “Relationship between Hardgrove grindability index and petrographic composition for high-volatile bituminous coals from Kentucky,” Journal of Coal Quality, 7, P. 122.

    Google Scholar 

  • Hower, J.C., and Wild, G.D., 1994, “Maceral/microlithotype analysis evaluation of coal grinding: Examples from Central Appalachian high volatile bituminous coals,” Journal of Coal Quality, 13, pp. 35–40.

    Google Scholar 

  • Hsieh, S.-S., 1976, “Effects of Bulk Components on the Grindability of Coals,” Ph.D. dissertation, The Pennsylvania State University, University Park, PA.

  • Leonard, J.W., 1964, “Grindability tests - short cut to blending coals for strong coke,” Min. Eng., 16(3), p. 45.

    Google Scholar 

  • Riley, J.T., Lloyd, W.G., Kuehn, K.W., Hayes, F.J., and Withers, D.L., 1987, “Modified Hardgrove grindability tests,” Proc. 6th Int. Coal Testing Conference, Charleston, WV, Sept. 15–17, p. 1.

  • Scott, D.H., 1995, “Coal Pulverizers — Performance and Safety,” International Energy Agency Coal Research, IEACR/79, 83 pp.

  • Stach, E., Mackowsky, M.-Th., Teichmüller, Taylor, G.H., Chandra, G.H., and Teichmüller, R., 1982, Coal Petrology, Gebrüder Borntraeger, Berlin.

    Google Scholar 

  • Terchick, A.A., Schoenberger, R.W., Perlic, B., and DeRusha, L.F., 1963, “Mechanical and related properties of some eastern coals,” Am. Chem. Soc. Fuel Chem. Div., Preprints of papers, 7(2), 95.

    Google Scholar 

  • Temeeva, L.A., 1979, “Connection of the strength properties with the petrographic characteristics of coals,” Khim. Tverd. Topl., 13(4), p. 102.

    Google Scholar 

  • Uesugi, K., 1988, personal communication.

  • Uesugi, K., 1989, “Evaluation of coal grindability,” The Society of Chemical Engineers, Kobe, Japan April 4–6, p. 277.

  • Uesugi, K., 1990, “Evaluation of coal grindability,” The Society of Powder Technology, Osaka, Japan May 23–24, p. 75.

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Authors and Affiliations

  1. university of Kentucky, Center for Applied Energy Research, Lexington, KY, United States

    J. C. Hower (member SME, senior penologist)

  2. Nova Scotia Department of Natural Resources, Halifax, Nova Scotia, Canada

    J. H. Calder (senior coal geologist)

Authors
  1. J. C. Hower
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  2. J. H. Calder
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Additional information

SME nonmeeting paper 96–623. Discussion of this peer-reviewed and approved paper is invited and must be submitted, in duplicate, prior to May 31, 1997.

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Hower, J.C., Calder, J.H. Maceral/microlithotype analysis of the Hardgrove grindability of lithotypes from the Phalen coal bed, Cape Breton, Nova Scotia. Mining, Metallurgy & Exploration 14, 49–54 (1997). https://doi.org/10.1007/BF03402751

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  • DOI: https://doi.org/10.1007/BF03402751

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