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Thermal Analyses of Silver-Based Sulfosalts in Air

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Materials Processing Fundamentals 2017

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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Abstract

The sulfosalts Ag0.93Cu1.07S (stromeyerite) and α-AgBiS2 (schapbachite) have been studied under oxidizing conditions at elevated temperatures. The sulfosalts were synthesized from the pure simple sulfides in evacuated quartz ampoules. The synthesized samples were thermally analyzed in the temperature range from 298 to 1173 K by a simultaneous DTA-TGA analyzer . Based on the DTA measurements the phase transition of stromeyerite to the solid solution (Cu, Ag)2S(hcp) in air is determined to be T = (360.9 ± 2) K. For the first time, maximum thermal stability of (Ag, Cu)2S in an oxidizing atmosphere close to the partial pressure of oxygen in air (P(O2) ≈ 0.20 atm) is determined to be below T = (614 ± 2) K, above which it oxidizes to form Ag, CuO and Ag2SO4. The melting temperature of Ag2SO4 determined from the cooling DTA curve, T = (932.76 ± 2) K, is in good agreement with the literature value. Below T = 1173 K, the oxidation process for schapbachite in air has been indirectly determined to be: 2AgBiS2 + 5.5O2(g) ⇄ 2Ag + Bi2O3 + 4SO2(g).

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Acknowledgements

The authors are grateful to the Academy of Finland for financial support. This work was made under the project “Chemistry of biomass impurities at reducing conditions in future thermal conversion concepts” as part of the activities of the Johan Gadolin Process Chemistry Center at Åbo Akademi University.

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Authors and Affiliations

  1. Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, FI-20500, Turku, Finland

    Fiseha Tesfaye & Daniel Lindberg

Authors
  1. Fiseha Tesfaye
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  2. Daniel Lindberg
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Correspondence to Fiseha Tesfaye .

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Editors and Affiliations

  1. Massachusetts Institute of Technology, Cambridge, USA

    Antoine Allanore

  2. Boston Electrometallurgical Corporation, Woburn, Massachusetts, USA

    Guillaume Lambotte

  3. Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, Massachusetts, USA

    Jonghyun Lee

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© 2017 The Minerals, Metals & Materials Society

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Tesfaye, F., Lindberg, D. (2017). Thermal Analyses of Silver-Based Sulfosalts in Air. In: Allanore, A., Lambotte, G., Lee, J. (eds) Materials Processing Fundamentals 2017 . The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-51580-9_6

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