Abstract
The strength of chemical bonds formed between eight rock-forming minerals and six bitumen samples were examined by heat-of-immersion calorimetry. The materials were characterised by their physical and chemical properties. The amount of energy released by the bitumen-mineral interaction was much larger than expected for an immersion reaction, exceeding usual values by a factor of up to 102. An oxidation mechanism, catalysed at the mineral surface, is proposed to account for this observation, and trends in the heat-of-immersion data are correlated with chemical properties of the bitumen and mineral samples.
Zusammenfassung
Mittels Tauchwärmekalorimetrie wurde die Stärke chemischer Bindungen zwischen acht verschiedenen gesteinsbildenden Mineralen und sechs Bitumenproben untersucht. Die Substanzen wurden anhand ihrer physikalischen und chemischen Eigenschaften beschrieben. Die durch die Wechselwirkung Bitumen/Mineral freigesetzte Energiemenge war wesentlich größer als für eine Eintauchreaktion erwrtet wurde und übertraf normale Werte um einen Faktor bis 100. Es wird ein an der Mineraloberfläche katalysierter Oxidationsmechanismus vorgeschlagen, um diese Beobachtung zu erklären, weiterhin werden Tendenzen der Eintauchwärme mit den chemischen Eigenschaften von Bitumen-und Mineralproben korreliert.
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Evans, M.B., Nowell, D.V. & Powell, M.W. Determination of adhesion in bitumenmineral systems by heat-of-immersion calorimetry. Journal of Thermal Analysis 40, 121–131 (1993). https://doi.org/10.1007/BF02546562
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DOI: https://doi.org/10.1007/BF02546562