Ağaçayak, Tevfik
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Agacayak, Tevfik
Agacayak, T.
Ağaçayak, T.
Agacayak, T.
Ağaçayak, T.
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tagacayak@ktun.edu.tr
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02.12. Department of Mining Engineering
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Current Staff
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Documents
32
Citations
168
h-index
6
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Scholarly Output
32
Articles
26
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6/26
Supervised MSc Theses
4
Supervised PhD Theses
1
WoS Citation Count
57
Scopus Citation Count
53
WoS h-index
5
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5
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0
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0
WoS Citations per Publication
1.78
Scopus Citations per Publication
1.66
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17
Supervised Theses
5
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| Journal | Count |
|---|---|
| International Journal of Coal Preparation and Utilization | 3 |
| Acta Chemica Iasi | 2 |
| Hydrometallurgy | 2 |
| Acta Montanistica Slovaca | 2 |
| Canadian Metallurgical Quarterly | 1 |
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32 results
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Now showing 1 - 10 of 32
Article Determination of Optimum Flotation Conditions in Nigde (ulukisla) Complex Pb-Zn Ore(Pamukkale Univ, 2021) Ağaçayak, Tevfik; Yılmaz, Nur BenanIn this study, optimum flotation conditions of Pb-Zn complex ore from Nigde-Ulukisla region were investigated. The liberalization grain size (d(80)) of the ore sample to be used in experimental studies was determined and mineralogical analyzes were performed. Flotation experiments were performed at 30% solid ratio, 10 L/min air flow rate, 1250 rpm stirring speed and pH=9. Reagents and their amounts were determined in grinding, Pb and Zn rough flotation circuits. 8 minutes in the grinding circuit, 4 min in Pb Circuit and 5 min in Zn circuit were applied to in the experiments. As a result, The lead grade of lead concentrate for 55.13%, the recovery for 80.30%, and zinc grade of zinc concentrate for 37.32%, the recovery for 77.60% were obtained.Article Citation - WoS: 2Citation - Scopus: 2Recyanidation of Gold Heaps Tailing at Hassai Region in Red Sea State, Sudan(Pleiades Publishing Inc, 2022) Osman Abdelraheem, M. Taha; Akasha, M.; Ağaçayak, T.The leaching and agitation tests of gold-bearing tailings from Hassai Mine in Sudan are carried out to find the appropriate particle size that will ensure the maximum recovery. The column tests revealed that it is easy to apply and recover about 65.52% of Au content from the Au-tailing heaps at Ariab mining company by heap leach process. The obtained recovery indicates that the economic commercial viability of the process to be applied for extraction of Au in the huge tailing heaps at Ariab mines.Article Citation - WoS: 1Citation - Scopus: 1Cleaning of Fine-Grained Lignite by Two-Stage Hydrophobic Flocculation Using Different Waste Oils(Taylor and Francis Ltd., 2025) Abdelraheem, M.T.O.; Agca, O.; Agacayak, T.; Duzyol, S.In this study, the conditions for obtaining clean coal from fine-grained lignite suspensions by two-stage hydrophobic flocculation using different waste oils were investigated. Waste vegetable oil, waste hydraulic oil and waste engine oil were chosen as bridging liquids for hydrophobic flocculation tests. During the studies, sodium silicate was used as the dispersant. Acetone was used at each stage to clean the floc obtained from the agglomeration process. The ash content (%) and combustible recoveries (CR, %) of the floc obtained at the end of each experiment were determined. In addition, contact angle (θ) and calorific values (kcal/kg) were measured and the results were evaluated in detail. At the end of the cleaning stages, low ash clean coal was obtained with a very high combustible recovery. In addition, it was observed that the calorific values increased considerably from 5128 to 5772,5558 to 6304 and 5447 to 5732 using waste vegetable oil, waste hydraulic oil and waste engine oil, respectively. © 2024 Taylor & Francis Group, LLC.Article Citation - WoS: 6Citation - Scopus: 6Solvent Extraction of Manganese and Zinc From Chloride Leach Solution of Spent Zn–c Batteries With Dehpa in Benzene Diluent(Springer Science and Business Media Deutschland GmbH, 2024) Abdelraheem, M.T.O.; Aras, A.; Taner, H.A.; Agacayak, T.The applicability of utilizing solvent extraction processes of manganese (Mn) and zinc (Zn) from chloride leachate of spent zinc–carbon (Zn–C) batteries has been studied by using di-2-ethylhexyl phosphoric acid (DEHPA) as an extractant agent. The effect of five factors (equilibrium pH, O/A ratio, temperature, extractant concentration, and diluent type) were investigated. According to the results gained, the appropriate solution pH level for DEHPA was found to be 6.5. With DEHPA (20%, v/v), 77.50% Mn and 100% Zn were extracted, within 15 min contact time at a 1:1 aqueous/organic ratio and 50 °C temperature. Also, a McCabe–Thiele diagram was drawn and one single-step extraction for Zn and a two-stage process for Mn were needed to achieve the highest extraction efficiency. ΔH as a thermodynamic parameter was calculated and found to be 18.39 kJ/mol for Mn and − 245.50 kJ/mol for Zn, respectively, indicating that the extraction process was endothermic for Mn and exothermic for Zn. A desirable stripping of Mn and Zn from the loaded organic phase could be obtained using a stripping solution of 6 M HCl. Graphical Abstract: (Figure presented.) © The Author(s) 2024.Article Investigation of the Retention of Oils Mixed With Water by Forming Activated Carbon Added Nanofibers(2022) Karabilgin Mustafa; Ağaçayak Emine; Safran Berra Gül; Ağaçayak Merve; Ağaçayak TevfikHeavy metals, waste oils, garbage, petroleum-derived polymers, animal and medical wastes cause pollution in water resources. The resulting pollution poses a danger to aquatic creatures and harms these creatures. In this study, obtaining wettable nanofibers for removing of oils mixed with water was investigated. It is aimed to increase the contact angle value by adding activated carbon produced from apricot kernels to the nanofibers produced from waste polystyrene. As a result, oil-water separation was carried out by increasing the hydrophobicity of the nanofiber and preserving its oil-holding property. In the experiments, 4 different concentrations of solutions were prepared using waste polystyrene and dimethylformamide (DMF)/(C3H7NO) and nanofibers were produced by electrospinning device. According to the SEM images, it was determined that the sample with the best fibre structure belonged to the 17% solution. On top of this, new nanofibers were produced by adding 5% and 10% by mass of activated carbon made from apricot kernels to the same solution. The contact angle values of the produced nanofibers were measured and it was observed that the hydrophobicity of the 10% activated carbon added nanofiber was the highest. In order to determine the water and oil absorption of the sample with the best structure and activated carbon added samples, it was tested by dropping 2 mL of water and 2 mL of oil on the experimental setup. As a result, it has been proven that this material, which has hydrophobic and oleophilic properties, can be used in oil/water separation processes, and the oil-derived waste polystyrene materials that cause water pollution are recycled.Article Citation - WoS: 3Optimization of Ferric Chloride Leaching Parameters of Copper Extraction From Chalcopyrite Concentrate Using Taguchi Method(Univ Alexandru Ioan Cuza Iasi, Editura Univ, 2020) Ağaçayak, Tevfik; Ahmed, Mohamed Taha Osman AbdelraheemTaguchi (L16) experimental design (DOE) was used to optimize the extraction process of copper from chalcopyrite concentrate statistically. A series of experiments involving leaching of copper by ferric chloride in a hydrochloric acidic medium were conducted. Process optimization of the experimental data was performed via statistical analysis. Analysis of variance (ANOVA) technique indicated that the most effective parameter was the stirring rate and the less effective parameter was the ferric ion concentrate. In this study, experimental parameters and their ranges were chosen as follows: solid-to-liquid ratio, 2 g/500mL; ferric chloride concentration, 0.05 M; leaching temperature, 30 degrees C; acid concentration, 0.5 M, and a stirring speed, 400 rpm. Under these conditions, copper extraction from chalcopyrite of approximately 89% were achieved.Master Thesis Niğde (ulukışla-madenköy) Bolkardağı Sülfürlü Kurşun-çinko Kompleks Cevherinin Optimum Flotasyon Şartlarının Belirlenmesi(Konya Teknik Üniversitesi, 2019) Yılmaz, Nur Benan; Ağaçayak, TevfikBu çalışmada, Niğde-Ulukışla yöresine ait Pb-Zn kompleks cevherinin optimum flotasyon şartları araştırılmıştır. Niğde (Ulukışla-Madenköy) yöresinden alınan sülfürlü Pb-Zn kompleks cevheri numunesinde öğütme+flotasyon deneyleri yapılmıştır. Deneysel çalışmalarda kullanılan cevher numunesinin mineralojik analiz sonucuna göre, cevher bileşiminde kalsit, kuvars, pirit, kalkopirit, hematit, götit, limonit, jips, galen, sfalerit, jarosit, arsenopirit ve markazit minerallerinin bulunduğu tespit edilmiştir. Ayrıca, Au ve Ag tanelerinin hematit, götit ve jarosit mineralleri içeriside kapanım halinde olduğu belirlenmiştir. Deneyler, %30 katı oranında, 10 L/dk hava akım hızında, 1250 dev/dk karıştırma hızında kurşun devresi pH=9 ve çinko devresi pH=12'de gerçekleştirilmiştir. Öğütme, Pb ve Zn kaba flotasyonu devresinde kullanılması gerekli olan reaktifler ve miktarları belirlenmiştir. Flotasyon testlerinde, pH ayarlayıcı olarak kurşun devresinde sodyum karbonat, çinko devresinde sönmemiş kireç, bastırıcı olarak, çinko sülfat, sodyum silikat, canlandırıcı olarak bakır sülfat, toplayıcı olarak sodyum izobütil dithiofosfin- potasyum amil ksantat ve köpürtücü olarak ise metil izobutil karbinol kullanılmıştır. Deneylerde, öğütme devresinde 8 dakika, Pb devresinde 4 dakika kondüsyon, Zn devresinde 5 dakika kondisyon süresi uygulanmıştır. Sonuç olarak, %80,63 verim ile %55,13 Pb ve %77,60 verim ile %37,32 Zn kazanılabileceği görülmüştür.Master Thesis Gümüşköy Kompleks Cevherinden Gümüşün Basınçlı Ortamda Çözündürme Şartlarının Belirlenmesi(Konya Teknik Üniversitesi, 2019) Apaydın, Burak; Ağaçayak, TevfikGünümüzde altın ve gümüş gibi değerli metalleri içeren cevherlerden altın veya gümüşün kazanılmasında tercih edilen ve uygulanan en yaygın yöntemlerden birisi siyanür liçi olarak bilinmektedir. Hidrometalurjik bir proses olan siyanürleme, 100 yıllardan beri altın ve gümüşü cevherlerden ve konsantrelerden ayırmak için kullanılmaktadır. Bu prosesin kullanılma sebebi ise düşük tenörlü ve çok ince tane boyut içeren cevherlerde yüksek verim oranlarında çalışılmasıdır. Gümüşün çözündürülmesi genellikle metal siyanür komplekslerinin karışımlarını içeren alkali siyanür çözeltileri kullanılarak gerçekleştirilmektedir. Bu çalışma, Gümüşköy (Kütahya) kompleks gümüş cevherinin kimyasal yöntemlerle zenginleştirilmesini kapsamaktadır. Bu amaçla, yüksek sıcaklık ve basınç kullanılarak siyanür liçi çalışmaları gerçekleştirilmiştir. Liç parametreleri olarak, tane boyutu, NaCN konsantrasyonu, sıcaklık, basınç, oksijen miktarı ve pH seçilmiş ve deneylerde tenör ve karıştırma hızı sabit tutularak bu parametrelerin kompleks gümüş cevherinden gümüşün çözündürülmesine etkisi incelenmiştir. Optimum sonuçların elde edildiği parametrelerin ise, tane boyutunu 10µm, NaCN konsantrasyonunu 1.2 g/lt, liç sıcaklığı 130°C, basıncı 10 bar, oksijen basıncı 1.5 bar ve pH ise 11 olduğu belirlenmiştir. Sonuç olarak, kompleks gümüş cevherinden gümüşün yüksek sıcaklık ve basınç kullanılarak siyanürlü ortamda çözeltiye alınabileceği görülmüştür.Article Citation - WoS: 3Citation - Scopus: 3Investigation of Ash Removal From Fine Grain Coal-Water Suspension by Hydrophobic Flocculation Using Taguchi (l-16) Experimental Design(Taylor & Francis Inc, 2022) Ağaçayak, TevfikIn this study, it was aimed to remove ash from fine-grained coal-water suspensions and a series of hydrophobic flocculation experiments were performed using the Taguchi (L-16) experimental design to determine the experimental optimum conditions. Five different controllable process variables such as amount of sodium silicate, suspension pH, amount of waste vegetable oil, flock growth time, and precipitation time, which are effective in hydrophobic flocculation of coal, and four different levels of each variable were investigated. Optimum conditions were determined as amount of sodium silicate 1 mL, pH = 3, amount of waste vegetable oil 4 mL, flock growth time 7 min and precipitation time 1 min. According to the optimization results obtained, the high calorific value (5450 kcal/kg) clean coal with 15.46% ash content and 100% combustible recovery was obtained with 57.52% ash removal. In addition, the contributions of each factor to hydrophobic flocculation of coal were determined with one way variance analysis (ANOVA). The most influential factor was determined as the pH value with a contribution of 61.34%.Article Citation - WoS: 5Citation - Scopus: 6The Influence of Sodium Fluoride on the Dissolution Kinetics of Metallic Titanium in Citric Acid Solution Using the Rotating Disc Method(Elsevier B.V., 2024) Motasim, M.; Aydoğan, S.; Agacayak, T.; Eker, Y.R.; El-gak, A.; Seifelnassr, A.A.S.This study reports the effect of sodium fluoride on the dissolution kinetics of pure metallic titanium in a citric acid solution. The effects of sodium fluoride concentration, citric acid concentration, temperature, stirring speed, and disc surface area were examined. The dissolution rate of titanium increases strongly with increasing citric acid and sodium fluoride concentrations. Fluoride ions react with hydrogen ions to form hydrofluoric acid, which removes the passive layer of titanium dioxide. An increase in the concentration of NaF and acid causes the formation of a brown layer on the surface of titanium. X-ray diffraction and SEM-EDX analyses showed that the layer composition is mostly of titanium fluoride (TiF3) and titanium fluoride oxide (TiOF2). A mixed kinetic model with an activation energy of 26.4 kJ/mol can be used to explain the reaction kinetics. © 2024 Elsevier B.V.
