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Leaching kinetics of natural cobalt triarsenide in chlorine solutions

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Abstract

The influence of stirring speed, particle size, chlorine and hydrochloric acid concentrations, and temperature on the kinetics of chlorine leaching of skutterudite particles in a stirred vessel has been investigated. The reaction rate is limited by transport in the aqueous phase with significant resistance of the chemical reaction at temperatures below 20 °C. This is supported by (a) the rate constant increases with decrease in particle size, (b) the first-order dependence of the leaching rate with the total chlorine concentration and the insignificant effect of the hydrochloric acid concentration, (c) an apparent activation energy of 18 kJ/mole for transport control and an approximate value of 85 kJ/mole for the chemical reaction, and (d) the agreement of the experimental transport constants with the expected values for mass transfer coefficients. The reaction kinetics were analyzed by a shrinking core model in which [(Sh) p − 2] (D/d) was considered virtually independent of particle size, which is consistent with the experimental data.

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Authors and Affiliations

  1. Department of Metallurgy, University of Barcelona, Avda. Diagonal 647, 08028, Barcelona, Spain

    J. Vi≈nals (Professor of Extractive Metallurgy), J. Oliveras (Professor of Extractive Metallurgy and Department Head) & C. Nú≈nez (Graduate Student)

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  1. J. Vi≈nals
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  2. J. Oliveras
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  3. C. Nú≈nez
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Vi≈nals, J., Oliveras, J. & Nú≈nez, C. Leaching kinetics of natural cobalt triarsenide in chlorine solutions. Metall Trans B 17, 629–637 (1986). https://doi.org/10.1007/BF02657125

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