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Intrinsic kinetics of the hydrogen reduction of Cu2S

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Abstract

Intrinsic kinetics of the hydrogen reduction of cuprous sulfide (Cu2S) have been measured. Experiments were carried out in the temperature range 823 to 1023 K using a thermogravimetric analysis method. The reaction was studied in detail using both thin pellets and powder samples. The reaction followed first-order kinetics with respect to the solid reactant concentration as well as the hydrogen concentration. An activation energy of 92.0 kJ/mol (22.0 kcal/g-mole) was obtained for the reaction. Copper produced from the reaction formed filaments which sintered above about 1000 K.

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Abbreviations

b :

number of moles of solid reacted by one mole of gaseous reactant

CH2 :

molar concentration of hydrogen (mol ⋅ cm-3)

E :

activation energy

k :

reaction-rate constant defined in Eq. [4] (cm3 ⋅ mor-1 ⋅ s-1)

k b :

apparent rate constant given in Eqs. [3] and [4] (s-1)

k o :

pre-exponential factor fork (cm-3 ⋅ mol-1 ⋅ s-1)

m :

constant in the nucleation and growth kinetics given in Eq. [3] (-)

R p :

half thickness of the sample (cm)

S :

term defined by Eq. [7]

t :

time (s)

T :

temperature (K)

X B :

fractional conversion of the solid (-)

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Authors and Affiliations

  1. Department of Metallurgy and Metallurgical Engineering, University of Utah, 84112-1183, Salt Lake City, UT

    H. Y. Sohn (Professor)

  2. Department of Metallurgy and Metallurgical Engineering, University of Utah, 800 East Pima Mine Road, 85725, Tucson, AZ

    S. Won (Graduate Student)

Authors
  1. H. Y. Sohn
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  2. S. Won
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Is now Senior Metallurgist with Cyprus Metallurgical Process Corporation

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Sohn, H.Y., Won, S. Intrinsic kinetics of the hydrogen reduction of Cu2S. Metall Trans B 16, 831–839 (1985). https://doi.org/10.1007/BF02667520

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