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Relationships between noble metals as potential coal combustion products and conventional coal properties
University of Michigan, Ann Arbor, USA.ORCID iD: 0000-0002-2265-6321
University of Kentucky, Lexington, USA.
2018 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 226, p. 345-349Article in journal (Refereed) Published
Abstract [en]

Increasing coal consumption has generated million tons of ash and caused various environmental issues. Exploring statistical relationships between concentrations of valuable metals in coal and other coal properties may have several benefits for their commercial extraction as byproducts. This investigation studied relationships between conventional coal concentrations and concentration of noble metals for a wide range (708 samples) of eastern Kentucky coal samples (EKCS) by statistical methods. The results indicate that there are significant positive Pearson correlations (r) > 0.90 among all noble metals (Au, Pt, Pd, Ru and Rh) except for Ag (r < 0.2). The results also showed that the noble metals (except Ag) are associated with the minerals of the coal and have high positive correlations with ash (and high negative correlations with the organic fraction). Modeling through the database demonstrated that the highest Au concentrations in the EKCS occur when Si is between 6000 and 8000 ppm and Fe is below 10000 ppm, and the highest Ag was observed when both Cu and Ni were over 40 ppm. Outcomes suggested that aluminosilicate minerals and pyrite are possibly the main host of noble metals (except Ag) in the EKCS whereas Ag might occur in various forms including organic association, mineral species, and as a native metal.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 226, p. 345-349
Keywords [en]
Coal consumption, Noble metals, Ash, Byproducts, Organic matter
Identifiers
URN: urn:nbn:se:ltu:diva-72244DOI: 10.1016/j.fuel.2018.04.041OAI: oai:DiVA.org:ltu-72244DiVA, id: diva2:1280801
Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-01-21Bibliographically approved

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Chelgani, Saeed Chehreh

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