Size and maceral association of pyrite in Illinois coals and their float-sink fractions |
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| Institution: | 1. North Carolina State University, Campus Box 7908, Raleigh, NC 27695, United States;2. Infrastructure and Geophysical Division, U.S. Department of Homeland Security, Washington, DC, United States;1. Orthodontics, School of Life Sciences, Pontifícia Universidade Católica do Paraná, Curitiba, Brazil;2. Biostatistics, School of Life Sciences, Pontifícia Universidade Católica do Paraná, Curitiba, Brazil;3. Informática Aplicada, Pontifícia Universidade Católica do Paraná, Curitiba, Brazil;4. Center for Advanced Dental Education, Saint Louis University, St. Louis, Mo;1. Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON N2L 3G1, Canada;2. Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, BC V6T 1Z4, Canada;3. Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 2W2, Canada;1. Department of Agricultural & Biosystems Engineering, 2344 Elings Hall, Iowa State University, Ames, IA 50011, United States;2. Department of Agricultural & Biosystems Engineering, 4350 Elings Hall, Iowa State University, Ames, IA 50011, United States;1. Center for Applied Geosciences, University of Tübingen, Hölderlinstr. 12, D-72074 Tübingen, Germany;2. Department of Civil and Environmental Engineering, Stanford University, 473 Via Ortega, 94305 Stanford, CA, USA;1. Department of Biotechnology, Federal University of Paraiba, João Pessoa, Brazil;2. Department of Biochemistry and Pharmacology, Federal University of Piauí, Teresina, Brazil;3. Department of Molecular Sciences, Rural Federal University of Pernambuco, Recife, Brazil |
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| Abstract: | The amount of pyrite (FeS2) removed by physical cleaning varies with differences in the amount of pyrite enclosed within minerals and of free pyrite in feed coals. A microscopic procedure for characterizing the size and maceral association of pyrite grains was developed and evaluate by testing three coals and their washed products. The results yield an index to the cleanability of pyrite. The index is dependent upon particle size and has intermediate values for feed coals, lower values for cleaned fractions, and higher values for refuse fractions; furthermore, it correlates with pyritic sulfur content. In the coals examined, the summed percentage of grain diameters of pyrite enclosed in vitrinite, liptinite, and bi- and trimacerite provides a quantitative measure of the proportion of early diagenetic deposition of pyrite. |
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