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Kinetics of leaching of zinc ferrite in aqueous hydrochloric acid solutions

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Abstract

The dissolution of synthetic samples of zinc ferrite in aqueous hydrochloric acid is stoichiometric. The rate appears to be controlled by a chemical reaction on the solid surface, and dependence of the dissolution rate on hydrochloric acid activity is of the first order. Activation energy of 83 kJ mol-1 was found. Zinc ferrite leaching is a slow solubilization process in the hydrochloric acid treatment of dead-roasted Iberian pyrite ashes. The most favorable conditions are 0.5-1 M HC1 at 90 to 100 ‡C, when preferential solubilization of the spinel phases takes place on the hematitic matrix. Extensive extraction of zinc (~90 pct of total zinc) in one to two hours and low solubilization of iron (~8 pet of total iron) results under these conditions.

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Authors and Affiliations

  1. Barcelona University, Avda. Diagonal, 645, 28, Barcelona, Spain

    C. NÚñez (Professor of Extractive Metallurgy and Head of the Metallurgy Department) & J. Viñals (Assistant Professor in the Metallurgy Department)

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  1. C. NÚñez
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  2. J. Viñals
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NÚñez, C., Viñals, J. Kinetics of leaching of zinc ferrite in aqueous hydrochloric acid solutions. Metall Trans B 15, 221–228 (1984). https://doi.org/10.1007/BF02667324

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