Preparation of different zinc compounds from a smithsonite ore through ammonia leaching and subsequent heat treatment

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dc.authoridEhsani, Arman/0000-0002-1758-8694
dc.authoridObut, Abdullah/0000-0003-2979-322X
dc.contributor.authorEhsani, Arman
dc.contributor.authorEhsani, Ilhan
dc.contributor.authorObut, Abdullah
dc.date.accessioned2025-01-06T17:36:20Z
dc.date.available2025-01-06T17:36:20Z
dc.date.issued2021
dc.description.abstractIn this study, firstly, the effects of ammonia concentration, leaching time and solid/liquid ratio on the leaching behaviour of zinc from a smithsonite (ZnCO3) ore sample in aqueous ammonia solutions were investigated at room temperature by chemical, X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectroscopy analyses. It was found that leaching ratio of zinc steeply increased from 30.1 to 76.2% with increasing ammonia concentration from 1.0 to 4.0 M and maximum zinc leaching ratio of 79.7% was reached after leaching in 13.3 M NH3 solution. The XRD pattern of the residue obtained after leaching in 4.0 M NH3 solution for 90 min at solid/liquid ratio of 0.15 g/mL, the optimum condition, showed that smithsonite phase in the ore sample almost completely dissolved whereas the gangue minerals goethite and calcite remained unaffected, confirming the selectivity of ammonia solution for zinc dissolution. Together with zinc, leaching ratios of cadmium were also determined. In second part of the study, precipitation tests (by complete drying at different temperatures) were conducted on dissolved zinc, carbonate and ammonia containing pregnant solutions obtained after selected leaching experiments. By complete drying of the pregnant solutions at low temperatures, i.e. 50 degrees C, relatively pure solid zinc ammine carbonate (Zn(NH3)CO3) precipitates and at higher temperatures, i.e. 150 degrees C, quite pure solid zinc carbonate hydroxide (Zn-5(CO3)(2)(OH)(6)) precipitates could be prepared. High-temperature heating of Zn(NH3)CO3 and Zn-5(CO3)(2)(OH)(6) precipitates at 450 degrees C yielded single-phase zinc oxide (ZnO). The chemical compositions, FT-IR spectra and scanning electron microscope (SEM) photographs of some of the precipitates were also presented.
dc.identifier.doi10.37190/ppmp/138698
dc.identifier.endpage106
dc.identifier.issn1643-1049
dc.identifier.issn2084-4735
dc.identifier.issue4
dc.identifier.scopus2-s2.0-85109142655
dc.identifier.scopusqualityQ2
dc.identifier.startpage96
dc.identifier.urihttps://doi.org/10.37190/ppmp/138698
dc.identifier.urihttps://hdl.handle.net/20.500.14669/1820
dc.identifier.volume57
dc.identifier.wosWOS:000663907600009
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherOficyna Wydawnicza Politechniki Wroclawskiej
dc.relation.ispartofPhysicochemical Problems of Mineral Processing
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_20241211
dc.subjectammonia leaching
dc.subjectsmithsonite
dc.subjectzinc ammine carbonate
dc.subjectzinc carbonate hydroxide
dc.subjectzinc oxide
dc.titlePreparation of different zinc compounds from a smithsonite ore through ammonia leaching and subsequent heat treatment
dc.typeArticle

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