Gas diffusion during the thermal analysis of pyrite |
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Authors: | F R A Jorgensen F J Moyle |
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Institution: | (1) Csiro Division of Mineral Chemistry, P.O.Box 124, 3207 Port Melbourne, Vic., Australia |
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Abstract: | Maximum rates of weight loss were measured during thermal analysis experiments involving the oxidation of thin layers of pyrite particles (<37 to 212–300 m screen size fractions) in oxygen-containing atmospheres (10–100%). The experimentally determined rates were compared with those calculated for several diffusion-based models. Good agreement was obtained with the model involving gas diffusion in the crucible.
Zusammenfassung Maximale Geschwindigkeiten des bei der Oxydation von in dünnen Schichten aufgebrachten Pyritteilchen (< 37 bis 212–300 m Teilchengröße) in 10–100 Sauerstoff enthaltenden Atmosphären auftretenden Gewichtsverlustes wurden im Verlaufe von thermoanalytischen Experimenten gemessen. Die erhaltenen Werte werden mit denen für einige, die Diffusion berücksichtigenden Modelle berechneten verglichen. Gute Übereinstimmung wurde bei dem die Gasdiffusion im Tiegel berücksichtigenden Modell erhalten.
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