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UZUN KART, ELİF

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UZUN KART

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ELİF

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    PublicationOpen Access
    Evaluation of sulphation baking and autogenous leaching behaviour of Turkish metallurgical slag flotation tailings
    (OFICYNA WYDAWNICZA POLITECHNIKI WROCLAWSKIEJ, 2021-06-11) UZUN KART, ELİF; Kart, Elif Uzun
    Turkish metallurgical slag flotation tailing's (MSFT) that has not been evaluated yet sulphation baking phase transformations and autogenous leaching behaviour were investigated. The MSFT in the study consists of the residual fayalite (FeO center dot SiO2) phase from the flotation, with a copper recovery of 87%, of the slag released during the smelting of the copper sulphide mine in northern Turkey, and the non-soluble glassy/amorphous structure containing the 0.34 % Cu, 4.16% Zn and 0.15 % Co base metals locked and doped to this phase. The effects of temperature (350 -650 degrees C) and sulphuric acid dosages (4-10 ml) on sulphation baking were investigated by X-ray diffraction and sulphur analyses of the baked MSFT (B-MSFT) to produce soluble base metal sulphates. Since sulphated metals are a kind of metal salt, autogenous leaching was applied to the B-MSFTs only with purified water to dissolute copper, zinc and cobalt. X-ray diffraction patterns show the transformation of fayalite to oxide and sulphate phases due to sulphation baking. All dissolution values of Co and Zn obtained by autogenous leaching of B-MSFTs produced under all determined conditions are almost the same as one another. This indicates that Co and Zn are doped to fayalite together and that part of cobalt is doped to the zincite structure and liberated and sulphated together. This study showed that MSFTs decompose leading to liberation and sulphation of the doped base metals in its structure at a rate of >= 90%, and that they autogenously dissolve under atmospheric conditions leading to recovery in a simple and economic manner.
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    PublicationOpen Access
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    PublicationOpen Access
    Investigation Mechanical and Microstructural Behavior of Operated and Unoperated Turbine Rotor Discs
    (2022-02-01) UZUN KART, ELİF; UZUN KART E., ÖZGÜL C.
    In gas turbine engines, turbine sections are exposed to high temperature and loads during operation and therefore turbine inlet boundary is considered the most challenging for turbomachines. Ni-based super-alloys are used for turbine materials in gas turbine engines because of their superior mechanical characteristics at high temperatures. In this research, two Mar M-247 polycrystalline cast Ni-based turbine rotors, which were operated and non-operated in turbojet engine tests, had the same design and applied the same two-step aging heat treatment, were examined microstructurally and mechanically. As a result of the mechanical analysis, it was observed that the tensile strength (Rm (P): 537Mpa; Rm (G): 590 Mpa) ductility, and hardness (429 HV (P), 440 HV (G)) of the operated turbine rotor increased. In the microstructure analysis, blocky and Chinese script-like carbides and gamma prime eutectic islands were found in both turbine structures. EDS analysis showed that the carbides in the matrix are rich in Hf, Ta, and Ti, and the grain boundary carbides are rich in Cr and W.
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    PublicationOpen Access
    Investigation of iron selectivity behavior of copper smelter slag flotation tailing with hematitization baking and base metals leaching methods
    (OFICYNA WYDAWNICZA POLITECHNIKI WROCLAWSKIEJ, 2021-09-06) UZUN KART, ELİF; Kart, Elif Uzun; Yazgan, Zeynep Hazal; Gumussoy, Aleyna
    In this study, iron selectivity behaviour of copper smelter slag (CSS) flotation tailings (38.08% Fe, 0.35% Cu, 4.48% Zn, 0.16% Co, 0.37% S) having fayalite and magnetite as major minerals was investigated with hematitization baking and base metals leaching methods using mineralogical and chemical analyses. For selectivity of iron, it was baked at temperatures of 650-690-700-710-730 degrees C. The aim of the baking is to transform the almost all of the iron in the fayalite into the oxidized (non-soluble) form and the base metals into the sulphated (soluble) form. The temperature that had the lowest hematitization rate of iron was found to be 650 degrees C, and the highest temperature was found to be 730 degrees C. To examine the dissolution behaviour of baked CSS flotation tailing was leached at 50 degrees C at a 1/10 (w/v) for 1 hour by using water. After baking at 690 degrees C calcine and leaching residue, S values were determinated to be approximately 17% and 9%, respectively. Baking made at 700 degrees C, amount of sulfate also decreased to 10% and S content was measured as 4% of its leaching residue. As a result of this study, 690 degrees C/700 degrees C was determined as optimum conditions of hematitization baking and base metals were extracted selectively when the iron was remained at leaching residue in Fe2O3 phase. It was determined that, hematitization is high and the sulphates of the base metals are preserved at 700 degrees C temperature. The fayalite phase completely decomposed into Si-O/Fe-O/Zn-S-O/Co-S-O compounds at 700 degrees C baking which was the highest iron selective and base metals dissolute temperature.
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    PublicationOpen Access
    Economic potential and environmental impact of metal recovery from copper slag flotation tailings
    (2023-01-01) BAŞYİĞİT, MİKAİL; UZUN KART, ELİF; Gümüşsoy A., BAŞYİĞİT M., UZUN KART E.
    © 2022 Elsevier LtdCopper slag has long been the subject of metal recovery. However, it has become apparent that copper slag flotation tailings can meet resource requirements under certain circumstances. Besides copper, zinc and cobalt can also be obtained from slag tailings. This study investigated the potential of copper slag tailings alongside global metal supply and demand dynamics. It has been emphasized that, such as copper slag, slag tailings can be a new potential resource for global base metals, considering global and domestic copper production, consumption, and base metal prices. In addition, its economic and environmental sustainability was evaluated from a waste management perspective.