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    Beneficiation of Complex Zinc-Lead Ores from Görgü (Malatya, Turkey) Region by Selective Flotation
    (Springer Heidelberg, 2024) Sis, Hikmet; Kiyak, Tufan; Erdemoglu, Murat; Demirkiran, Nizamettin; Aydogmus, Ramazan
    The growing demand for zinc and lead metals necessitated beneficiation of complex and oxidized zinc-lead ores, the ore types which are considered as difficult-to-float with conventional flotation. This study aimed to investigate flotation behavior of complex zinc-lead ores from G & ouml;rg & uuml; (Malatya) region that contains 2.92% Pb and 11.86% Zn. The characterization of flotation fractions by XRD, XRF, ICP, and elemental analysis provided valuable data for interpretation of the results. Studies revealed the effectiveness of various types and dosages of reagents in the flotation. It was found that high dosages of collector (e.g., 500 g/t KAX), sulfidizing agent (e.g., 5000 g/t Na2S.9H2O), and depressing/dispersing agents (e.g., 4000-5000 g/t Na2SiO3 and 2000-3000 g/t Na2CO3) was required to separate lead minerals effectively. In a single rougher flotation, a lead concentrate of 38.50% Pb grade could be obtained with 70.57% recovery. Nevertheless, zinc flotation results were not satisfactory as the zinc recovery and grade, respectively, could not exceed 17.70% and 17.01%.
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    Recovery of Zinc from Flotation Tailings of Lead-Zinc Ore Through a Hydrometallurgical Route
    (Springer, 2025) Sis, Hikmet; Kiyak, Tufan; Erdemoglu, Murat; Demirkiran, Nizamettin; Aydogmus, Ramazan
    This study focuses on recovering zinc from flotation tailings through a hydrometallurgical route, including sequential H2SO4 leaching, iron precipitation, and solvent extraction (SX) processes. The effect of leachate concentration, leaching temperature, and time on the zinc recovery was investigated at constant solid/liquid ratio and stirring rate. In order to remove impurities from the pregnant leach solution (PLS), dissolved iron was first precipitated with NaOH solution, and then the dissolved zinc ions were extracted selectively by D2EHPA. Finally, the zinc in the organic D2EHPA phase was stripped into an aqueous phase by utilizing H2SO4 solution to obtain a concentrated and purified zinc solution. It was seen that 93.50% of zinc in the tailings could be leached under optimum leaching conditions. In the SX process, the organic phases, prepared at organic/aqueous ratio (O/A) of 1/1 by volume, could extract 95.3% of the zinc in the pregnant leach solution within 10 min of extraction time. The stripping of 96.83% zinc into the aqueous phase was possible by using a 0.5-M H2SO4 solution, prepared at an O/A ratio of 1/1 by volume. Calculations showed that an 82.65% of cumulative zinc recovery could be achieved through the proposed leaching and SX route.