Beneficiation of a zinc-oxide rich phase by leaching refired Imperial Smelting Process slags |
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| Authors: | I Colussi S Meriani |
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| Institution: | Applied and Industrial Chemistry Institute, University of Trieste, Trieste Italy |
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| Abstract: | This paper deals with a method devised to concentrate and recover the zinc oxide present in Imperial Smelting Process slags. It is based on a preliminary refiring cycle, which enables the concentration of almost the whole of the zinc available in the slag in a newly formed phase, a magnetite—franklinite solid solution (Fe3O4ZnFe2O4), embedded in a glassy groundmass. The following sulphuric acid leaching treatment was found to exhibit a selective dissolving action, leaving most of the zinc-bearing phase as a solid residue.The laboratory procedure could be developed into a possible route for the complete utilization of Imperial Smelting Process slags.An overall recovery of about 85% of the total zinc available in the original slag was obtained after 8.5 hrs of leaching action of a 2% sulphuric acid solution at a temperature of 100°C. |
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