Resumo

ZHANG, C. et al. Extraction of zinc from zinc ferrites by alkaline leaching: enhancing recovery by mechanochemical reduction with metallic iron. J. S. Afr. Inst. Min. Metall. [online]. 2016, vol.116, n.12, pp.1111-1114. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2016/v116n12a3.

This study evaluates the efficiency of using mechanochemical reduction to assist the extraction of zinc from zinc ferrites by alkaline leaching. The transition of zinc ferrite into a metastable state after mechanochemical reduction with metallic iron contributes to the ready dissolution of zinc from the activated zinc ferrites in alkaline solution. Zinc ferrites were mechanochemically reduced under conditions of Fe:ZnFe₂O₄ mole ratio of 2:1, using 5 mm diameter stainless steel balls as the activation medium at a mass ratio of balls to raw materials of 25:1. Subsequent leaching in 6 mol/L NaOH solution at 90°C resulted in more than 70% Zn extraction. These results may be used to further develop a hydrometallurgical process for recovering zinc from zinc ferrites in alkaline solution.

Palavras-chave : zinc ferrite; mechanochemical reduction; metallic iron; alkaline leaching.

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