Kimya Mühendisliği Bölümü Bildiri / Sunu / Poster / Proje Koleksiyonu
Bu koleksiyon için kalıcı URI
Güncel Gönderiler
Öğe Flotation recovery of barite from high-density waste drilling fluid using β-cyclodextrin as a novel depressant and its mechanism(PLOS, 14 Mart 2024)High-density waste drilling fluid contains an abundance of recyclable weighting reagents, direct disposal can pollute the environment. In this paper, the primary mineral composition of a high-density waste drilling fluid from a well in the southwest oil and gas field was analyzed. This paper proposes β-cyclodextrin (β-CD) as a depressant for the recovery of barite from waste drilling fluid. The recovery process was investigated through inverse flotation experiments, and the mechanism was analyzed using zeta potential, contact angle analysis, and FTIR. The flotation experiments showed that under the SDS flotation system, when the pH was 9.0 and the amount of depressant β-CD was 900 g/t, the barite recovery and density reached the highest values, which were 87.41% and 4.042 g/cm3, respectively.Öğe Mechanical properties of discarded shield residue improved by calcium carbide slag and fly ash as subgrade filling(PLOS, 3 Aralık 2024)To utilize discarded shield residue and alleviate the shortage of subgrade filling, industrial wastes such as calcium carbide slag (CCS) and fly ash (FA) were considered to enhance the mechanical properties of the shield residue. A series of laboratory tests, including California Bearing Ratio (CBR) tests, unconfined compressive strength (UCS) tests, moisture content tests, pH tests, water stability tests, and dry-wet cycles tests were performed on discarded shield residue with additive contents. The results show that the UCS and CBR values enhanced significantly with the increase in curing time. However, the moisture content and pH of the stabilized soil exhibited a decreasing trend. The early UCS of CCS-FA stabilized soil is slightly lower than that of QL-FA stabilized soil. After 60 curing days, all stabilized soil exhibited a UCS value exceeding 1.9 MPa. In addition, the CBR values of CCS-FA stabilized soil were more than 8 times higher than those of the original shield residue.Öğe Research on structural parameter optimization of a new axial inlet hydrocyclone separator based on response surface optimization method(PLOS, 2 Ocak 2024)Aiming at the problem that the current hydrocyclone separator is affected by multiple structural parameters and there is interaction between the multiple structural parameters, it is difficult to determine the optimal structure. Taking the new axial inlet hydrocyclone separator as the research object, a fast parametric optimization method based on response surface optimization method is proposed. The overflow outlet diameter, overflow tube depth and small cone length, which have significant influence on the separation efficiency of the axial inlet hydrocyclone separator, are selected as the optimal variables, and the cyclone separation efficiency is selected as the response index. A mathematical driving model between the response index and the optimal variables is constructed by using the second-order polynomial basis function. The optimal structural parameters of the new axial inlet hydrocyclone separator are obtained through the response optimization of the parameter variables in the global response range through the mathematical driving model, and the numerical simulation method and laboratory test are double verified.Öğe Investigation of the production of high carbon concentrate from Kütahya-Oysu graphite ores by flotation method(Eskişehir Osmangazi University, 16 Ekim 2024)With the world keeping on moving from fossil fuels to renewable energy sources, battery metals— graphite included—are playing an ever-more-important role. Because high-grade graphite ores are harder to come by naturally, low-grade ores must be treated to boost their value in order to satisfy the growing demand, which is expected to rise by more than 700% by 2025 as a result of the widespread use of electric vehicles. New graphite occurrences in Eastern Türkiye reveal the hidden potential of mineralization, while on the other hand, the Menderes Massif metamorphic rocks in Western Türkiye host active graphite mining and potentially prove the existence of more graphite deposits. It was reported that the deposit contains 7.2 million tons of graphite and 125 million tons of potential graphite ore. Because graphite is hydrophobic by nature, low-grade ores are often beneficiated through flotation. The present research offers the first experimental investigation on the flotation method of graphite ore beneficiation in the Kütahya-Oysu region with the aim of optimizing some affecting variables in mechanical flotation.Öğe A Review on Shape Characterization of the Gold and Copper Metallic Particles Recovered from the Flotation of Various E-wastes(Eskişehir Osmangazi University, 16 Ekimn 2024)The recovery of copper and gold metals from waste electrical and electronic equipment (WEEE) materials, which accumulate rapidly as a result of the renewal of technology in the world day by day, is not only necessary but also mandatory due to the principle of circular economy and ecological concerns. Although it is known that particle shape plays an active role in ore flotation, the effect of particle shape in the flotation process used in the recycling process of e-waste materials has not yet been fully examined. Moreover, the inherent difficulties encountered in floating coarse grains in conventional flotation of these metallic ores are well known. Thus, in this work, a novel flotation approach was used to recycle various e-wastes, including waste printed circuit boards (WPCBs), waste electrical wires (WEWs), and waste RAM boards (WRAMs), in an easier, and environmentally friendly manner. It aims to pre-concentrate valuable (Cu, Au) metallic particles by selective and coarse-grained flotation after removing the plastic.Öğe Effect of particle shape on bubble-particle attachment behavior: roles of surfaces, edges and vertexes(2023) Ma, Guangxi Ma; Bu, Xiangning Bu; Ulusoy, Ugur; Xie, GuangyuanIt has been understood through many studies that particle shape is important in terms of particle adhesion to air bubbles in flotation. However, there are many questions yet to be answered. Whether the surface of the particle or its sharp corners is effective is only one of the issues that need to be better understood. Therefore, this study aims to delve deeper into the fundamental studies on the role of particle's geometry (surface, edges, and vertex) in their flotation behavior by investigating the attachment of spherical, cylindrical, triangular prismatic, and cubic particles to air bubbles based on their attachment efficiency, settling velocity, collision efficiency, and induction time. Bubble-particle attachment test results inferred that the attachment efficiency was in the order of cubic > triangular > cylindrical > spherical. In addition, it was found that the induction time of the spherical surface decreased from 37 ms to 15 ms with increasing collector concentration, while the induction time of the edged cubic particle decreased from 8 ms to 2 ms. This was attributed to the fact that the edge facilitates the drainage, thinning, and rupture of the water film between the bubble and the particle, thereby increasing the attachment efficiency. Finally, it has also been observed that the three-phase contact line of the cube particle is larger than that of the spherical particle, which improves the attachment stability and reduces detachment efficiency. The results obtained in this study shed light on the fact that the shape of the particles fed to flotation can be produced by using a suitable mill and thus higher flotation efficiency can be achieved with lower collector concentration.Öğe Advanced Green and Sustainable Chemical and Physical Technologies for Resources Recycling of Solid Wastes(Frontiers Media SA, 02 Mart 2023) Bu, X; Park, I; Ulusoy, UTo prevent CO2-induced climate change, the world is quickly moving toward a carbon- neutral society by using electric vehicles, renewable energy sources, and other energy sources, which demand more resources than traditional ones in terms of materials, minerals, and metals. In this regard, recycling processes of rare earth elements (REEs), metals, plastic, and glass from secondary sources with a zero-waste strategy have become more important in order to reduce environmental damage and bring them into the economy when primary mineral resources are running out. Therefore, in this Research Topic, studies on effective, non-hazardous, long-term, and ecological recycling processes of solid wastes, including by-products from industrial processes containing metals have been compiled. This Research Topic, which selects and collects eleven original research papers and one mini-review paper that has conducted studies on this field, sheds fresh light on critical aspects providing crucial scientific knowledge that will benefit future research. The first part of the articles collected is related to the release and migration of heavy metals in solid wastes. Zhang et al. calculated the environmental vulnerability factors affecting the dissolution of heavy metals in fly ash from a thermal power plant. Fly ash has been suggested as a possible soil conditioner and additive that might be used to enhance reclamation soil in coal mining subsidence sites. Zheng et al. analyzed how low molecular weight organic acids such as citric acid and malic acid impacted the migratory characteristics of Pb in polluted soils. Due to its capacity to activate Pb, the use of citric acid has been suggested as a technique that can improve the efficacy of remediating reclaimed soil. Since it has been reported that the smelting technique has the potential for innocuous processing to overcome the waste Research Topic in the electrolytic manganese industry by creating glass ceramics using electrolytic manganese slag as feedstock and solidified heavy metal constituents (Sun et al., 2020), Wang et al. studied the process of heavy metal solidification and stability in glass-ceramics containing electrolytic manganese slag. It has been concluded that the glass-ceramic system’s interwoven pattern of glass and crystal phases also contributed to the improved curative influence of heavy metals.Öğe Comparison of Particle Shape, Surface Area, and Color Properties of the Calcite Particles Ground by Stirred and Ball Mill(2023) Ulusoy, U.; Cayırlı, S.; Bayar, G.; Gokcen, H.SSince the particle size, shape, specific surface area, and purity of the ground calcium carbonate (GCC) decide its usability in the paper, paint, and plastic industries, the effect of grinding is important. However, the effect of stirred and ball mill grinding on the particle shape of GCC by dynamic image analysis (DIA) is still lacking in the literature. Therefore, the aim of this study is to compare the aspect ratio at the same fineness (d97 = 50 μm) and evaluate other properties such as color, and surface area of GCC particles by stirred and ball mill grindings. DIA results showed that particles produced by the ball mill had higher aspect ratio values than those by the stirred mill. This was attributed to the impact, and attrition breakage modes produced by the ball and stirred mill, respectively. This conclusion is supported by XRD and SEM. Finally, the results related to physical properties such as aspect ratio, surface area, and whiteness are discussed depending on the usage area of GCC.Öğe DEMİRYOLU TEKERLEĞİ VE AKSITAMOTOMATİK ULTRASONİK MUAYENE İSTASYONUNUN GELİŞTİRİLMESİ ,2019 -2022(2022) Görgün, E.; Erşan M.GörgünE.,ErşanM.,TÜBİTAKProjesi,DEMİRYOLUTEKERLEĞİVEAKSITAMOTOMATİKULTRASONİKMUAYENE İSTASYONUNUNGELİŞTİRİLMESİ,2019 -2022
