Maden Mühendisliği Bölümü Koleksiyonu

Bu koleksiyon için kalıcı URI

https://hdl.handle.net/20.500.12428/2683

Listeleniyor 1 - 8 / 8

Fine-size separation of halloysite, kaolinite, and quartz minerals as binary systems using dispersion and sedimentation methods
(Oficyna Wydawnicza Politechniki Wroclawskiej, 2025) Durgut, Emrah; Çavdar, Yunus Emre; Çınar, Mustafa; Yavuz, Osman; Özdemir, Orhan
Clay minerals are mainly composed of aluminum hydrosilicates. In some minerals, aluminum is completely or partially replaced by Fe or Mg. Alkaline minerals or alkali metals are present as major constituents of clay minerals. While some clay sources may contain a single clay mineral, they often contain different minerals such as quartz, calcite, feldspar, pyrite, etc. as impurities. They also contain organic matter and water-soluble salts. Halloysite is a clay mineral belonging to the kaolinite group and USA Environmental Protection Agency (EPA 4A) declared it as an innocuous/adaptable material to human health and the environment. Halloysite ore deposits are mainly found together with kaolinite and quartz minerals, but can also be found as a pure source. The degree of purity of halloysite ore determines the industrial area where it will be used and therefore its economic value. Since clay minerals are naturally composed of fine particles, it is necessary to disperse the clay particles in suspension to separate halloysite and kaolinite minerals. In addition, there are also fine-grained quartz minerals, and to recover pure halloysite minerals, it is necessary to determine their properties in the fine size fraction. In this study, the dispersion properties of halloysite, kaolinite, and quartz minerals in the presence of sodium silicate (SS), sodium tripolyphosphate (STPP), and sodium hexametaphosphate (SHMP) dispersants in fine-size fraction (-38 }m) were researched by particle size measurements and mineral separation properties were investigated by sedimentation experiments at different acidic, neutral, alkaline pH values. In dispersion experiments, the d90 values of halloysite, kaolinite, and quartz minerals were 74.0, 50.7, and 61.3 }m without any dispersant addition, and such values decreased to 54.7, 26.3, and 57.1 }m as SHMP increased to 10 kg/ton, respectively. d50 and d10 values showed a significant change for halloysite, while no important change was observed for kaolinite and halloysite. SHMP had the most effect on the particle size change in the dispersants especially on halloysite minerals. The least effect on particle size change was observed in the quartz sample with dispersant addition. The sedimentation experiments aimed to investigate the effects of pH on halloysite, kaolinite, and quartz recoveries in binary systems as settled products. Kaolinite settled more at acidic pH and halloysite at basic pH. There was no pH-dependent change in the settling behavior for halloysite and quartz. In the quartz-kaolinite system, quartz mineral settled more than kaolinite for all pH values. The settling experiments showed the importance of morphological differences between tubular halloysite and lamellar kaolinite minerals.
Effectiveness of fly ash in boron removal from Tuzla (Çanakkale) geothermal fluid
(Yıldız Technical University, 2021) Şahin, Mehmet Oğuzhan; Bektaş, Tijen Ennil; Şanlıyüksel Yücel, Deniz
The heat accumulated in the inner parts of the earth's crust is transmitted to the fluid in the geothermal aquifer by means of transportation. The geothermal fluid is transported to the surface either by wells or naturally. In this study, the geothermal fluid in Tuzla geothermal field in Çanakkale city was examined due to its high boron content (10.3 mg L-1). It was aimed to remove boron from geothermal fluid by adsorption in order to prevent possible negative effects on the environment. Fly ash was obtained from Çan thermal power plant. The specific surface area of the fly ash was 14.6 m2 g-1 and the particle size was between 1.45 and 186 µm. According to ASTM C618 standard, fly ash was classified as Class C. Fly ash was composed of anhydrite, lime, hematite, cristobalite, quartz, calcite and feldspar. Various parameters such as initial pH, adsorbent dosage, contact time, and temperature were studied experimentally for the removal of boron from the geothermal fluid. The suitability of pseudo-first-order, pseudo-second-order, and intraparticle kinetic models to experimental data was examined. The data obtained from the isotherm studies were applied to the Langmuir, Freundlich and Dubinin-Radushkevich models.
Determining the geochemical characteristics of geothermal resources and generating a geothermal information system of thermal waters in Biga Peninsula, NW Turkey
(Amer Chemical Soc, 2013) Şanlıyüksel Yücel, Deniz; Yücel, Ali Mehmet; Karaca, Zeki; Çetiner, Ziya S.; Erenoğlu, Ramazan Cüneyt; Akçay, Özgün; Kamacı, Celal; Çalışkan, Hidayet
Düşük Sıcaklıklı Bir Jeotermal Alanın İnsansız Hava Aracı Termal ve RGB Görüntüleri ile Modellenmesi: Kocabaşlar Jeotermal Alanı Örneği, Kuzeybatı Türkiye
(Tmmob Jeoloji Mühendisleri Odası, 2024) Şanlıyüksel Yücel, Deniz; Yücel, Mehmet Ali
Kocabaşlar jeotermal alanı Türkiye'nin kuzeybatısındaki Çanakkale ilinde yer almaktadır. Jeotermal alanda 650 m derinlikte açılmış sıcaklığı 46 °C olan bir sondaj ve sıcaklığı 38,1 °C olan bir jeotermal kaynak bulunmaktadır. Bu çalışmada ilk kez Kocabaşlar jeotermal alanının çift kameralı insansız hava aracı (İHA) kullanılarak termal ve görünür bant (RGB) kamera görüntüleri ile yüksek çözünürlüklü olarak modellenmesi amaçlanmıştır. Jeotermal alandaki arazi çalışmaları hava sıcaklığının düşük, meteorolojik koşulların görüntü çekimi için uygun olduğu 6 Ocak 2023 tarihinde yapılmıştır. İHA termal ve RGB kamera ile görüntü çekimleri; 40 m sabit yükseklikten 2,5 m/s hız ve %80 ileri ve %70 yan bindirme oranları ile gerçekleştirilmiştir. Elde edilen toplam 1718 termal ve RGB görüntünün işlenmesi sonucunda Kocabaşlar jeotermal alanının yüksek çözünürlüklü termal (5,25 cm/piksel) ve RGB (1,37 cm/piksel) ortofotoları ve sayısal yüzey modeli (5,47 cm/piksel) üretilmiştir. Üretilen görüntüler coğrafi bilgi sistemleri ortamında görselleştirilmiştir. Jeotermal alanın yüzey sıcaklığının 6 °C ile 38 °C arasında değiştiği saptanmıştır. Kocabaşlar jeotermal alanın İHA teknolojisi ile uzun süreli takip edilerek jeotermal kaynağın kullanım alanlarının geliştirilmesi ve sürdürülebilirliğine katkı sağlanması planlanmıştır.
Effect of blunging process on purification of halloysite ore from ferrous impurities by dry magnetic separation
(Oficyna Wydawnicza Politechniki Wroclawskiej, 2024) Durgut, Emrah; Çınar, Mustafa; Boylu, Feridun; Özdemir, Orhan
The objective of this research is to study the effects of feed particle size, splitter angle, and washing process on Fe2O3 removal efficiency in the separation of ferrous impurities from halloysite ore by dry magnetic separation in order to increase the purity of halloysite sample after crushing and blunging processes separately. Firstly, after crushing ore in a jaw crusher and sizing to -2+1 mm, -1+0.5 mm, and -0.5+0.212 mm fractions, the sized materials were fed to REMS-type dry magnetic separator at a constant belt speed of 300 rpm with the splitter angles of 0, 15, 30 degrees separately. Maximum Fe2O3 removal efficiency (FRE) (97.1%) was obtained in the nonmagnetic product at -0.5+0.212 mm size fraction and 0 degrees splitter angle. The minimum Fe2O3 content (1.3%) was reached in the nonmagnetic product obtained in the experiment with the feed size of -2+1 mm and a splitter angle of 0 degrees. Secondly, dry magnetic separation was applied to the washed -2+0.212 mm size fraction after drying at room temperature to evaluate the coarse particle -sized halloysite ore that was gained by mechanical dispersion in the aqueous medium towards sodium hexametaphosphate (SHMP), while a significant part of the clay minerals went into fine size after the dispersion process. In the experiment performed with a 0 degrees splitter angle after washing, it was determined that halloysite concentrate of 0.4% Fe2O3 content could be obtained with 98.8% Fe2O3 removal efficiency. As a result of dry magnetic separation experiments, it was seen that Fe2O3 removal efficiency decreased as the splitter angle increased, while Fe2O3 content in magnetic and nonmagnetic products increased. It was determined that washing and cleaning of finesized minerals plastered on particle surfaces after mechanical dispersion and particle release of minerals with different magnetic properties increased the dry magnetic separation efficiency, and nonmagnetic products with very low Fe2O3 (0.4%) and high Al2O3 (31.9%) content was obtained. The blunging process in the presence of dispersant caused the dispersion of clay minerals and allowed to liberating of the ferrous minerals from the halloysite ore, hence the increase in the FRE for the magnetic separation.
UAV-based RGB and TIR imaging for geothermal monitoring: a case study at Kestanbol geothermal field, Northwestern Turkey
(Springer Science and Business Media Deutschland GmbH, 2023) Yücel, Mehmet Ali; Şanlıyüksel Yücel, Deniz
Kestanbol is one of the most important geothermal fields in NW Turkey. This study conducted the first-ever surveys over a 10 ha reach of the Kestanbol geothermal field using an unmanned aerial vehicle (UAV) equipped with visible (RGB) and thermal infrared (TIR) cameras. Low-altitude flights below 40 m above the ground were operated above the Kestanbol geothermal field. Approximately 3500 RGB and TIR images were captured using the UAV. We recorded high-resolution RGB and TIR data of the Kestanbol geothermal field and applied the structure from motion (SfM) algorithm to identify the distribution of geothermal springs and seeps. The Kestanbol geothermal field was monitored to create a georeferenced RGB orthophoto, RGB 3D surface model, thermal anomaly map, and digital surface model (DSM) of the area with centimeter-level accuracy. In the TIR orthophoto, the surface temperature in the geothermal field was found to be between 15 and 75 °C. All the thermal anomalies revealed by the survey were verified by field observations. The geothermal springs and seeps were parallel to the NE–SW regional tectonic trends. The results of this study demonstrate an effective technique for monitoring and assessing geothermal water using UAV-based RGB and TIR imaging and provide an accurate basis for geothermal development projects. RGB and TIR imaging using UAVs are considered promising methods for improving the assessment of the effects of geothermal water on the environment.
Digital image processing (DIP) application on the evaluation of iron-rich heavy mineral concentrates produced from river sand using a sequential mineral processing approach
(Oficyna Wydawnicza Politechniki Wroclawskiej, 2021) Terzi, Mert; Kurşun Ünver, Ilgın; Çınar, Mustafa; Özdemir, Orhan
In this study, the iron-rich heavy mineral concentrate production from river sand as a byproduct of an alternative resource by gravity, magnetic separation, and flotation methods were investigated in detail. For the physical separation of the sample and increasing the Fe2O3 content, a shaking table and a wet high-intensity magnetic separator were used, respectively. The gravity and magnetic separation experiments included rougher, cleaner, and scavenger circuits. In the flotation experiments, cationic flotation with ethylenediamine under acidic conditions, and anionic flotation with sodium oleate under alkaline conditions were performed. The iron and silica content of the products obtained were determined by digital image processing (DIP) methods and compared with the classical analytical procedures. Finally, a flow chart was proposed for the processing of the ore according to the optimum enrichment parameters were determined from the experiments. The results obtained in this study show that it is possible to produce an iron-rich heavy mineral concentrate with Fe2O3 grade and recovery rate of 79.13% and 57.81%, respectively, in addition to a potential feed for the production of quartz sand and feldspar concentrates.
Hydrogeochemical and isotopic monitoring of the Kestanbol geothermal field (Northwestern Turkey) and its relationship with seismic activity
(TUBİTAK, 2021) Şanliyüksel Yücel, Deniz; Özden, Süha; Marmara, Harika
Kestanbol geothermal field is located in northwestern Turkey and is one of the highest temperature geothermal fields in the Biga Peninsula. In this study, one geothermal well, two geothermal springs, and two cold springs were monitored for one year in Kestanbol geothermal field to determine hydrogeochemical and isotopic characteristics. Additionally, any possible relationship between seismic activity and variations in the hydrochemistry of geothermal water was investigated. The Kestanbol geothermal field is controlled mainly by the right-lateral strike-slip Kaplıca fault with normal components. The distribution of the geothermal waters is roughly parallel to the fault. The temperature, electrical conductivity, salinity, and pH value of the geothermal waters were within the range of 59.5 to 74.6 °C, 30300 to 35700 μS/cm, 19.6 to 23.3‰ and 6.13 to 6.83, respectively. The temperature interval was from 11.2 to 25.4 °C for cold waters. The hydrochemical facies of the geothermal waters were Na-Cl type, and the cold waters were Ca-HCO3-Cl type. The high concentrations of As, Ba, Fe, Li, and Mn in geothermal waters were mainly derived from prolonged water-rock interactions under high-temperature conditions. The δ18O and δ2H contents of cold waters indicated meteoric origin. The geothermal waters were enriched in δ18O and δ2H and located on the mixing line between local groundwater and fossil seawater, indicating mixing processes. During our study period, 20 earthquakes with Mw 3.5 and above were recorded in the close surroundings of the Kestanbol geothermal field, and temporal variations in the physicochemical and chemical compositions of geothermal waters were observed. Concentrations Cl- of the geothermal waters exhibited decrease after the Tartışık-Ayvacık earthquake (Mw = 5.0), indicating more supplement of groundwater with shallow origin under the increase of tectonic stress.

Güncel Gönderiler