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The leaching kinetics of cobalt and nickel from aluminum-coprecipitated products

  • Hydrometallurgy
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Abstract

The leaching behavior of cobalt and nickel from aluminum-coprecipitated products in ammoniacal solutions has been investigated. Cobalt and nickel were precipitated with aluminum in a solution containing 0.5 M of total ammonia, a mixture of ammonium hydroxide and ammonium nitrate at pH 10. The leaching was carried out at 2 M total ammonia concentration at pH 10. The effect of aging the coprecipitated products on the leaching behavior of cobalt and nickel was also investigated. The equation of continuity with a source term for a spherical coordinate was solved numerically using a forward finite differentiation technique to describe the leaching of cobalt. The nickel leaching kinetics was best described by chemical reaction at the solid/liquid interface of the grains of the precipitated product. The Arrhenius activation energy for cobalt and nickel was found to be very much influenced by the aging time of coprecipitated products and varying over a wide range, 10.5 to 26.8 kJ/mol for cobalt and 15.0 to 38.9 kJ/mole for nickel.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, South Dakota School of Mines and Technology, 500 East St. Joseph Street, 57701, Rapid City, SD

    K. N. Han (Professor)

  2. Department of Metallurgy and Materials Engineering, Anambra State University of Technology, Enugu, Nigeria

    C. O. Nebo (Lecturer)

  3. Department of Metallurgical Engineering, South Dakota School of Mines and Technology, USA

    W. Ahmad (Research Assistant)

Authors
  1. K. N. Han
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  2. C. O. Nebo
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  3. W. Ahmad
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Han, K.N., Nebo, C.O. & Ahmad, W. The leaching kinetics of cobalt and nickel from aluminum-coprecipitated products. Metall Trans B 18, 635–640 (1987). https://doi.org/10.1007/BF02672879

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  • DOI: https://doi.org/10.1007/BF02672879

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