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    Characterization of the effects of acetic acid on the recovery of valuable contents from flotation tailings of non-sulfide metals
    (Oficyna Wydawnicza Politechniki Wroclawskiej, 2024) Yogurtcuoglu, Emine
    Non-sulfide lead flotation tailings draw attention in terms of their valuable contents. Dissolution studies have been carried out with strong inorganic acids, especially in ore form, but these acids have been unfavorable in removal in the context of metal recovery processes. Organic acids, on the other hand, are notable for their environmentally friendly properties and selective metal recovery opportunities. In this study, the effects of acetic acid on metal recovery from oxidized waste were investigated with different experimental parameters at a laboratory scale. Optimal conditions were determined depending on the increase in acetic acid concentration. At 0.75-1.0 M acid concentrations, 49-55% Pb and 49-54% Zn recovery efficiencies were obtained with grades of 7.0-7.2% and 19.5-19.7%, respectively. The recovery of Pb/Zn by the leaching process with acetic acid and the selective nonrecovery of iron were also observed through characterization studies. With the Rietveld XRD method, an increase in iron minerals such as goethite and a decrease in smithsonite-hydrozincite minerals were determined. These changes were seen as a decrease in the contents of these minerals in SEM/EDX analysis and as a decrease in smithsonite mineral bond structures in the FT-IR analysis. This study showed that acetic acid has many advantages in the utilization of zinc-lead-containing oxide flotation tailings, which have high economic value, such as selective metal recovery, easy biodegradability, environmental friendliness, and non-corrosiveness.
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    Evaluating the grinding process of granitic rocks using the physico-mechanical and mineralogical properties
    (Chulalongkorn Univ, Metallurgy & Materials Science Research Inst, 2019) Kahraman, Sair; Ucurum, Metin; Yogurtcuoglu, Emine; Fener, Mustafa
    Granitic rocks are sometimes ground for different purposes. Predicting the mean particle size (d(50)) is useful for planning and cost estimation of purposes. In order to investigate the possibility of predicting the d(50) of ground rock from the physico-mechanical rock properties, six different granites were tested in the laboratory. First, the d(50) values were correlated with the corresponding physico-mechanical properties. The simple regression analysis showed that there were no good correlations between the d(50) and the physico-mechanical properties. Then, the multiple regression analysis was carried out and strong prediction equations were developed. It was also shown that the dominant parameter in grinding was the abrasive mineral content of rock. It is concluded that the d50 of granites can be predicted from the derived multiple regression equations especially for preliminary investigations. The developed estimation equations including index test values are especially useful since they are easy to use.
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    Investigation of the effect of cyanidation after microwave roasting treatment on refractory gold/silver ores by characterization studies
    (Oficyna Wydawnicza Politechniki Wroclawskiej, 2023) Yogurtcuoglu, Emine
    In this article, the efficiency of microwave pretreatment, which is an environmentally friendly, low-energy consuming method for recovery from refractory gold-silver ores, was investigated. The ore sample belonged to the oxidized Bolkardag deposit, which contains carbonate (calcite, dolomite, smithsonite, hydrozincite), silicate (quartz, hemimorphite), sulfate (beudantite, plumbo-jarosite), and iron oxy/oxyhydroxide (hematite, limonite) minerals. Sulfur/sulfate-bearing silver and gold minerals are found either together with gangue minerals or in inclusions. Approximately 90% gold and 48% silver recovery efficiencies were achieved with the cyanide process after microwave preroasting from the ore. Additionally, the ore, heat treatment product, and waste samples were investigated by characterization studies. In these studies, bond structures, mineral content, sample mass losses, element percentage content differences, and mineral percentage content differences in the samples were determined. As a result, the microwave pretreatment application in cyanidation was presented as a new research topic in terms of its application in the valuable refractory content of this type of oxide.
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    MECHANO-ACTIVATED SURFACE MODIFICATION OF CALCIUM CARBONATE IN STIRRED MILL
    (INT SCIENTIFIC CONFERENCE SGEM, 2010) Ucurum, Metin; Yogurtcuoglu, Emine
    The industrial importance of calcium carbonate as a filler in composite materials such as plastics, textiles, rubbers, paints, pigments and paper is well recognized and the application in the polymer industry is increasing. Therefore, surface modification is a key process in functional calcium carbonate powder preperation. In this study, surface modification of calcium carbonate particles, obtained Nigde region, using sodium stearate (SDS) and sodium oleate (SO) as modification agents incorporated with the simultaneous wet ultra-fine grinding in the laboratory horizontal stirred mill was investigated. The results indicate that the hydrophilic surface of calcium carbonate is turned into hydrophobic after modification with the reagents.
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    Surface modification of calcite by wet-stirred ball milling and its properties
    (ELSEVIER SCIENCE SA, 2011) Yogurtcuoglu, Emine; Ucurum, Metin
    This paper investigates the surface modification of calcite from the Nigde region of Turkey with sodium oleate (SDO) as a modification agent, which is incorporated into the calcite with wet ultra-fine grinding in a laboratory stirred ball mill. The effect of surface modification is evaluated by a floating test, which measures the active ratio (AR), fourier transform infrared spectrometry (FT/IR) and thermogravity analyses (TG-DTA). The results indicate that the hydrophilic surface of calcite becomes hydrophobic after the incorporation of SOD through wet-stirred ball milling. (c) 2011 Elsevier B.V. All rights reserved.
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    The citric acid leaching of boron process wastes
    (Taylor & Francis Ltd, 2023) Yogurtcuoglu, Emine
    Avec les usines de bore appartenant a ETI Mine Operations concentrees en Anatolie occidentale, la Turquie possede les plus grandes reserves de bore au monde (73.6%). Les dechets annuels des usines de bore ont une teneur en B2O3 superieure a la quantite de matiere premiere brut de plusieurs regions du monde. Ces dechets, dont l'abondance augmente a chaque annee, engendrent d'autres problemes environnementaux, en plus des problemes de stockage des barrages/etangs de dechets. Pour cette raison, il est essentiel de recuperer ces dechets. Dans cette etude, on a effectue des essais d'optimisation concernant la production d'acide borique a partir d'un acide organique dans le procede d'utilisation des dechets (8-12% B2O3) de borate (Ca/Na-Ca) de l'usine de bore Bal|kesir/Bigadic. Dans ce but, on a utilise la technique de Yates (ANOVA) dans les experiences avec un rapport de solides de 8 a 12% en poids, une temperature de 40 a 80oC, une duree de lixiviation de 20 a 60 minutes et une concentration d'acide citrique de 0.15 a 0.45 M. Selon les resultats de l'essai d'optimisation, on a identifie des efficacites de recuperation de 90 a 95% et des valeurs de consommation nette d'acide (NAC) ont ete determinees a 22-86 kg/t. Des etudes de caracterisation telles que des analyses FT-IR, SEM, XRD Rietveld et XRF ont egalement ete realisees sur des echantillons de minerai brut (dechets primaires) et de dechets traites.
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    The Effect of Roasting on the Mineralogical Structure and Cyanidation Performance of Gossan Type Oxidized Refractory Gold-Silver Ores
    (Springer Heidelberg, 2023) Yogurtcuoglu, Emine; Alp, Ibrahim
    This article includes the application of roasting pretreatment by assisting the cyanidation process in the recovery of Au-Ag from Bolkardag Gossan refractory ore and the characterization studies of the ore, roasting sample, and post-cyanidation waste sample. While ore contained many metals along with gold and silver, the environment in which these metals were found was carbonate, sulfated, silicated, and iron oxide-containing deposits that have undergone oxidation. In mineralogical studies, there were Fe oxy/oxyhydroxides, Pb/Zn carbonates, and jarosite-bearing structures such as beudantite, calcite, dolomite, clay, and quartz in the ore. The sample used in the experiments was d(80) = 29.6 & mu;m, and the test parameters were determined by examining the TG analysis made to the ore. Preroasting experiments were carried out at a roasting temperature range of 200-800 & DEG;C, during a roasting period of 10.0 min. Three different samples were characterized by TG for temperature changes, FT-IR for bond structures and permeability, SEM/EDX for visual inspection of structural changes, and XRD Rietveld's analysis for mineral % content differences. As a result of the cyanidation experiments carried out after the pretreatment, gold was recovered with 80-90% yields and silver with 40-48% yields, respectively.