Shah, N
1994
Collaborative Study of Quantitative Coal Mineral Analysis Using Computer-Controlled Scanning Electron Microscopy
Galbreath, K.C.; Zygarlicke, C.J.; Casuccio, G.S.; Moore, T.A.; Gottlieb, P.J.; Agron-Olshina, N.; Huffman, G.P.; Shah, A.; Yang, N.Y.C.; Vleeskens, J.M. and Hamburg, G.
Fuel, 1994 (in press). Funded by US Department of Energy/Morgantown Energy Technology Center and Brigham Young University.
Six laboratories collaborated in an international study of the computer-controlled scanning electron microscopy (CCSEM) method of quantitative coal mineral analysis. A total of five analyses were performed by most of the laboratories on three bituminous coal samples: Pittsburgh No. 8, Illinois No. 6, and Prince. Repeatability relative standard deviation was less than 20% for the four minerals analyzed: calcite, kaolinite, pyrite, and quartz. Reproducibility relative standard deviations (RSDR) ranged from 21% to 83%. Reproducibility of the kaolinite results was the poorest, with an average RSDR of 60%, and pyrite was the best with an average RSDR of 22%. The reproducibility of calcite and quartz analysis results was similar, with an average RSDR of 38% and 36%, respectively. Although pyrite content was determined the most precisely, normative mineral calculations indicate that the results are overbalanced. Improvement in the interlaboratory agreement of CCSEM results will require the development of a standardized calibration procedure.
Shah, N
1994
Collaborative Study of Quantitative Coal Mineral Analysis Using Computer-Controlled Scanning Electron Microscopy
Galbreath, K.C.; Zygarlicke, C.J.; Casuccio, G.S.; Moore, T.A.; Gottlieb, P.J.; Agron-Olshina, N.; Huffman, G.P.; Shah, A.; Yang, N.Y.C.; Vleeskens, J.M. and Hamburg, G.
Fuel, 1994 (in press). Funded by US Department of Energy/Morgantown Energy Technology Center and Brigham Young University.
Six laboratories collaborated in an international study of the computer-controlled scanning electron microscopy (CCSEM) method of quantitative coal mineral analysis. A total of five analyses were performed by most of the laboratories on three bituminous coal samples: Pittsburgh No. 8, Illinois No. 6, and Prince. Repeatability relative standard deviation was less than 20% for the four minerals analyzed: calcite, kaolinite, pyrite, and quartz. Reproducibility relative standard deviations (RSDR) ranged from 21% to 83%. Reproducibility of the kaolinite results was the poorest, with an average RSDR of 60%, and pyrite was the best with an average RSDR of 22%. The reproducibility of calcite and quartz analysis results was similar, with an average RSDR of 38% and 36%, respectively. Although pyrite content was determined the most precisely, normative mineral calculations indicate that the results are overbalanced. Improvement in the interlaboratory agreement of CCSEM results will require the development of a standardized calibration procedure.