Browsing by Category "Makale- Uluslararası- Editör Denetimli Dergi"
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Item Beneficiation of Eskişehir Beylikova Bastnasite Ore and Rare Earth Elements Recovery(Scopus, 2023-11-14) Türker, Gülşah; Koç Delice, Tülay; Temizkalb, Arda; Özgür, Özgün Cem; Soydaş Sözer, BelmaUnique magnetic, optical and electrical properties of rare earth elements (REEs) have be come essential in modern high technology. Considering this necessity of technology, efficient man agement and utilization of rare earth resources is of great importance. Even though there are more than 250 rare earth minerals in around the world, the number of minerals that can be economically processed, not exceeding three. Among these minerals, bastnaesite, has a significant impact on sci entific advancement and social progress. This project aims to contribute to the establishment of a sustainable supply chain for REE in Turkey and Europe by conducting research and development activities to leverage the utilization of REEs found in our country. The primary objective of this project is to extract rare earth oxides from complex ore in the Eskişehir Beylikova region, which holds the largest reserve potential discovered in our country, and to refine these metal oxides to produce metals that can be used in magnet manufacturing. The project encom passes five main work packages during three years: Project management, ore enrichment, solvent extraction based purification, utilization of REOs and metals in additive material and magnet pro duction.Item Descriptive Process Mineralogy to Evaluate Physical Enrich-ment Potential of Malatya/Kuluncak Rare Earth Ore through MLA(MDPI, 2023-09-12) Ersoy, Burakhan; Beşirli, Mehmet Umut; Topal, Selim; Soydaş Sözer, Belma; Burat, FıratRare Earth Elements (REE) are indispensable parts of magnetic, phosphor, metal alloys, catalysts, ceramics, glass, pol-ishing, and defense systems industries due to their unique physical and chemical properties. Currently, China is the largest sup-plier in the world with a production of more than 95% of the world’s Rare Earth Oxides (REO). To reduce the influence of China on the REE market, the countries have started to develop their national strategies for the production and use of REE-bearing resources. Within the scope of this study, particle size, chemical, MLA, XRD, and SEM-EDS analysis were performed for material characterization, and shaking table, centrifugal, and magnetic separations were carried out for the beneficiation of Mala-tya/Kuluncak rare earth ore. The XRD analysis indicated that the representative sample consists of major minerals such as albite, calcite, montmorillonite, muscovite, titanite, kaolinite, clinochlore, and aegirine. Parisite, bastnaesite, Zr-REE-Silicate, Fe-REE-Oxide, and Ca-Ti-Nb-REE-Oxide were detected as REE-bearing minerals by MLA. The chemical analysis resulted in a ∑REO grade of 3,628 g/t and the ore consists of mostly light REE. According to the result of the gravity separation for the coars-est fraction, about 11.3% by weight of the total feed was concentrated as a heavy product assaying 6,437 g/t ∑REO. As a result of magnetic separation, magnetic products with 5,561 g/t and 6,013 g/t ∑REO were obtained at coarse and fine fractions, respective-ly. Finally, the characterization studies and enrichment results were correlated, and very important and meaningful indications about the behavior of REE-bearing minerals were obtained.Item Development of CuO nanoparticles modified electrochemical sensor for detection of salbutamol(Iop Publishing, 2024-04-29) Koc Delice, Tulay; Ak Azem,Funda; Ozdemir, Kazim; Alpat, SenolMetal oxide structures are being utilized in an increasing variety of applications. This study used cyclic and differential pulse voltammetry techniques to investigate the possible utilization of copper oxide (CuO) nanoparticles modified carbon paste electrode (CPE)for the redox reactions of salbutamol (SAL). The electrochemical performance of the SAL analyte in a complex matrix environment in Ventolin was evaluated in order to assess the appropriateness of the proposed sensor in a real sample environment. CuO nanoparticles were produced via a straightforward, cost-effective and efficient sol– gel method, and characterization studies of synthesized CuO nanoparticles were performed by scanning electron microscopy, x-ray Diffraction (XRD), and x-ray photoelectron spectroscopy. The synthesized CuO nanoparticles had a spherical shape and particle size was found to be 74 nm. The crystal size of the CuO particles was calculated to be 21.79 nm using the Debye–Scherrer equation. Under optimal conditions, differential pulse voltammetry demonstrated a linear response in the 50 nM to 100 μM range, with a salbutamol detection limit of 50 nM (S/N = 3). The SAL concentration (R2= 0.9971)was found to have a good correlation coefficient. The reproducibility of the biosensor was investigated and evaluated with a relative standard deviation of 3% (n = 8). The storage stability of CuO modified CPE for two weeks was evaluated based on the response of DP current measured at intervals every two days. According to the measurement results, the modified electrode exhibited good stability and reproducibility while maintaining 80% of its stability. It is also a rapid and dependable sensor candidate with a measurement time of approximately 20 s. The developed electrode has been utilized successfully to determine doping material with improved performance.Item Impact of Extractant Type and pH on Yttrium Recycling from End of Life Fluorescent Lamp(Scopus, 2023-11-14) Koç Delice, Tülay; Türker, Gülşah; Obuz, Hüseyin Eren; Soydaş Sözer, BelmaRare-earth elements (REEs), which are indispensable for high technology and renewable energy, are becoming more significant due to their distinct properties (e.g., catalytic, metallurgical, magnetic, etc.) and their diverse applications in a wide range of contemporary technologies, environmental initiatives, and economic domains. In the pursuit of an environmentally friendly, sustainable, circular approach, recycling and utilizing secondary rare-earth resources as potential reservoirs of REEs may present an alternative to primary mining, addressing future raw material demands. Secondary REE sources include various products such as fluorescent lamps, light-emitting diodes (LEDs), magnets, wind turbines, electric motors, and batteries. Powders used in fluorescent lamps contain approximately 3% phosphorus, and these powders comprise a high ratio of precious REEs such as Y, Eu, La, Ce, and Tb. This study involves the recovery of yttrium from end-of-life fluorescent lamps. The composition of the end-of-life fluorescent lamp was analyzed using X-ray fluorescence (XRF) and X-ray diffraction (XRD) techniques subsequent to grinding. The leaching process was conducted to investigate the effects of leach parameters on the efficiency of the reaction. In the subsequent phase of the study, a solution obtained with the optimum leaching efficiency was subjected to the purification of Y using the solvent extraction (SX) method. The effect of each different extractant and pH values on Y-recovery were investigated for SX process. Yttrium oxide powders were characterized by XRF and ICP(OES) techniques, and high-purity Y2O3 powders were obtained with high yield.Item Investigation of the Effects of Ion Sources and RF Power on the Neutron Production Rate at SNRTC-IEC Fusion Device(Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu (TENMAK), 2024-08-19) Bölükdemir, Arife Seda; Olgaç, Yeşim; Alaçakır, AliThe studies on inertial electrostatic confinement device are generally focused to increase the particle production. One way to achieve this is to increase the number of the ion source. In this study, D-D fusion reaction was carried out in the SNRTC-IEC fusion device (previously at TAEK, now re-established as TENMAK) at 85 kV cathode voltage and 5×10-4 mbar pressure, and the effect of ion sources and RF power on the neutron production rate was investigated. To ensure a high concentration of ions in the center of the cathode, three Inductively Coupled Plasma (ICP) deuterium ion sources were added to this device. As the number of ion sources increased from 1 to 3, the neutron production rate increased from 2.3 104 n/s to 3.6 105 n/s. Two ion source configurations were used to examine the effect of RF power. It was observed that when the RF power was increased from 40 W to 200 W the neutron production rate increased linearly from 4.6 104 n/s to 1.7 105 n/s.Item Transfer Factors of 238U, 232Th, 40K, 210 Pb to selected some Crops and radiation impact assessment in Semi Arid Environment(Springer, 2024-05-22) Dirican, Abdullah; Dikmen, Hasan; Şahin, Mihriban; Gülay, Yusuf; Özkök, Yücel Özel; Kaya, Nihal; Vural, MustafaResearch on the safety of staple agricultural food products has always been one of humanity's priorities and provides input for dose assessment models. Within this important priority, activity concentrations, transfer factors (TF), and radiological effects of 238U, 232Th, 210Pb, and 40 12 K were studied for selected crops in a village close to the NORM area, located in Central Anatolia region of Turkey. The RESRAD-onsite code has been used to assess the total dose rate. The simulation of the risk analysis covered 80 years. The maximum total dose of 0.5 mSv/yr was obtained at t = 30 years.