Önen, Vildan
Loading...
Profile URL
Name Variants
Önen, Vi̇ldan
Onen, Vildan
Önen, V.
Onen, V.
Onen, Vildan
Önen, V.
Onen, V.
Job Title
Email Address
vonen@ktun.edu.tr
Main Affiliation
02.12. Department of Mining Engineering
Status
Current Staff
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
2
ZERO HUNGER
1
Research Products
4
QUALITY EDUCATION
1
Research Products
6
CLEAN WATER AND SANITATION
6
Research Products
7
AFFORDABLE AND CLEAN ENERGY
2
Research Products
9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
5
Research Products
12
RESPONSIBLE CONSUMPTION AND PRODUCTION
5
Research Products
14
LIFE BELOW WATER
1
Research Products
Documents
23
Citations
142
h-index
8
This researcher does not have a WoS ID.
Scholarly Output
25
Articles
16
Views / Downloads
8/1
Supervised MSc Theses
5
Supervised PhD Theses
1
WoS Citation Count
49
Scopus Citation Count
55
WoS h-index
4
Scopus h-index
4
Patents
0
Projects
0
WoS Citations per Publication
1.96
Scopus Citations per Publication
2.20
Open Access Source
9
Supervised Theses
6
Google Analytics Visitor Traffic
| Journal | Count |
|---|---|
| International Journal of Environmental Science and Technology | 3 |
| ARABIAN JOURNAL OF GEOSCIENCES | 1 |
| Biodegradation | 1 |
| Chemosphere | 1 |
| Clay Minerals | 1 |
Current Page: 1 / 4
Scopus Quartile Distribution
Competency Cloud
25 results
Scholarly Output Search Results
Now showing 1 - 10 of 25
Article Citation - WoS: 12Mechanism of Mechanical Entrainment in Chalcopyrite Flotation: Effects of Clay Minerals(Springer Heidelberg, 2023) Taner, Hasan Ali; Önen, VildanOne of the problems in flotation is mechanical entrainment and the other is the presence of complex gangues (especially clay minerals). In the present study, it was aimed to determine the effects of clay types (kaolinite, illite, and montmorillonite) on mechanical entrainment parameters (total flotation recovery, real recovery, mechanical entrainment recovery, and water recovery). Effects of clay types and clay amount on chalcopyrite flotation were investigated by flotation experiments. Interaction mechanisms between the clay minerals and ore were characterized using SEM-EDS analyses. Experiments were carried out with and without a collector using the mixture of clay minerals and ore under certain experimental conditions. While the clay mineral most affecting the chalcopyrite grade was montmorillonite, the highest mechanical entrainment recovery and the lowest real recovery values were obtained in the presence of illite. While illite is stated as the least problematic clay mineral in the literature, it was determined that illite among three clay minerals used in this study caused significant mechanical entrainment. In contrast, it was determined that increasing the amount of kaolinite did not have a significant effect on mechanical entrainment. This study's findings will guide in determining of clay minerals' effect on gangue entrainment in flotation.Article Kil Minerallerinin Kömürün Flotasyon Performansına ve Ortalama Kabarcık Boyutuna Etkisi(2023) Önen, Vildan; Çağlar, Ayşe Zeynep; Taner, Hasan AliFlotasyon, ince boyutlu kömürlerin zenginleştirilmesinde kullanılan en etkili yöntemlerdendir. Bununla birlikte, kömürün yan kayaç olarak kil minerallerini bulundurması flotasyon işlemini olumsuz etkilemektedir. Bu çalışmada kil minerallerinin (kaolin ve montmorillonit) ve flotasyon reaktiflerinin Tunçbilek linyit kömürünün flotasyon performansına ve ortalama kabarcık boyutuna etkisi araştırılmıştır. Deneysel çalışmalarda; bastırıcı olarak sodyum silikat, toplayıcı olarak gaz yağı kullanılırken, köpürtücü olarak ise metil izobütil karbinol (MIBC) ve Dowfroth 250 kullanılmıştır. Kil türü ve miktarı, bastırıcı miktarı ve köpürtücü türü ve miktarı çalışılan deneysel parametrelerdir. Bastırıcı miktarı ve kil içeriğinin etkisinin belirlendiği deneysel çalışmalarda, kaolin içerikli numunelerde %40-55, montmorillonit içerikli numunelerde ise %30-47 aralığında yanabilir verim değerleri elde edilmiştir. Köpürtücü olarak Dowfroth 250 ile daha iyi sonuçlar elde edilmiş ve montmorillonit içeren kömür numunesi, kaolin içeren kömür numunesine göre daha büyük kabarcıklar oluşmasına neden olmuştur. Bu çalışmadan elde edilen sonuçlar yan kayaç olarak kil bulunduran kömürlerin flotasyon davranışlarının anlaşılabilmesi ve çözüm önerileri sunulabilmesi için temel bir altyapı oluşturacaktır.Article Citation - Scopus: 12Mechanism of Mechanical Entrainment in Chalcopyrite Flotation: Effects of Clay Minerals(Springer Science and Business Media Deutschland GmbH, 2023) Taner, H.A.; Onen, V.One of the problems in flotation is mechanical entrainment and the other is the presence of complex gangues (especially clay minerals). In the present study, it was aimed to determine the effects of clay types (kaolinite, illite, and montmorillonite) on mechanical entrainment parameters (total flotation recovery, real recovery, mechanical entrainment recovery, and water recovery). Effects of clay types and clay amount on chalcopyrite flotation were investigated by flotation experiments. Interaction mechanisms between the clay minerals and ore were characterized using SEM–EDS analyses. Experiments were carried out with and without a collector using the mixture of clay minerals and ore under certain experimental conditions. While the clay mineral most affecting the chalcopyrite grade was montmorillonite, the highest mechanical entrainment recovery and the lowest real recovery values were obtained in the presence of illite. While illite is stated as the least problematic clay mineral in the literature, it was determined that illite among three clay minerals used in this study caused significant mechanical entrainment. In contrast, it was determined that increasing the amount of kaolinite did not have a significant effect on mechanical entrainment. This study’s findings will guide in determining of clay minerals’ effect on gangue entrainment in flotation. © 2023, Society for Mining, Metallurgy & Exploration Inc.Article Citation - WoS: 2Citation - Scopus: 3Development of Sustainable Resource Recovery Approach From Agro-Industrial Wastes by Revealing the Economic Added Value Potential(Springer Nature, 2024) Goktepeli, G.; Ozgan, A.; Onen, V.; Ahmetli, G.; Kalem, M.; Yel, E.The physicochemical sludge generated from treatment of effluents from marble processing facilities should be managed properly due to their adverse effects on the environment. These sludges can be evaluated as catalyst in pyrolysis since they consist of some inorganics such as CaCO3 and Al or Fe salts which come from marble structure and coagulation–flocculation treatment of the effluent, respectively. Therefore, in this study, an approach for sustainable resource recovery from agro-industrial wastes (olive pomace) was developed by offering a solution to the two different waste types via pyrolysis and by revealing economic value-added potential of the process. Olive pomace-marble sludge catalyst mixtures were pyrolyzed in a laboratory-scale fixed bed batch pyrolysis system by using four catalyst dosages (10, 20, 30 and 50%) and three pyrolysis temperatures (300, 500 and 700 °C) at 5 °C/min heating rate. Pyrolysis oils and gases were analyzed with GCMS-FID and FTIR for evaluating the potential of economically valuable organic compounds. Organic compounds having extensive usage areas, such as feedstock for surfactants production, emollient, flavoring and softening, and high economic value in the market, such as 1-Pentadecanol, 2-Pentadecanone and Octane, were identified especially in catalytic pyrolysis liquid products. For instance, the potential profit that can be obtained from the conversion of olive pomace to ‘2-pentadecanone’ compound found in catalytic pyrolysis oil produced in this study is around 2.46 × 1013 USD for 2021/22 years at ideal conditions. Consequently, the presented approach contributes to sustainable circular economy via converting wastes into economic value instead of conventional waste disposal methods. Graphical abstract: (Figure presented.). © The Author(s) under exclusive licence to Iranian Society of Environmentalists (IRSEN) and Science and Research Branch, Islamic Azad University 2024.Article Citation - WoS: 8Citation - Scopus: 8Marble Processing Effluent Treatment Sludge in Waste Pet Pyrolysis as Catalyst-I: Pyrolysis Product Yields and the Char Characteristics(Springer, 2022) Önen, V.; Ozgan, A.; Göktepeli, G.; Kalem, M.; Ahmetli, G.; Yel, EsraThe processing and evaluation of industrial wastes together with other wastes may help material to remain in the system longer within circular economy. This study aimed to evaluate marble processing effluent physicochemical treatment sludge (K1) as catalyst in the waste poly(ethylene terephthalate)-PET pyrolysis. The effects of K1 dose (10-50%) and target temperature (300, 500, 700 degrees C) on the pyrolysis product yields and char characteristics were investigated. Fixed bed batch pyrolysis system was used under nitrogen atmosphere. The pyrolysis gas, oligomer and char product quantities changed in the range of 10.2-43.9, 2.42-21.9 and 23.5-83.8%, respectively. The increase in the K1 dose increased the char and decreased the liquid amount. Thermal, chemical, mineralogical characterization and proximate analyses were applied to char products. PET + K1 mixtures' chars mainly contain calcium carbonate (CaCO3), dolomite (CaMg(CO3)(2)), Ca(OH)(2), CaO, calcite (Mg0.03Ca0.97)(CO3). The char humidity and heat values decreased with increasing K1 doses. The residual value at 900 degrees C for PET waste was 14.2% while for PET + K1 mixtures it varied between 15.2 and 33.9%. Thermal degradation residual percentages of the 500 degrees C pyrolysis chars varied between 79.2 and 58.8%. K1 increased the thermal stability of the char, and this can provide it new areas of use. For example, when thermally stable char is needed with low pore volume and low surface area, K1 dose between 30 and 50% and the pyrolysis temperature of 500 degrees C can be suggested. By using K1, the variety of chars having different characteristics was obtained which transformed K1 and chars economic value as second-generation solutions.Article Citation - Scopus: 1Marble Processing Effluent Treatment Sludge in Waste Poly(ethylene Terephthalate) Pyrolysis as Catalyst–ii: Recovery From Pyrolytic Fluids(Institute for Ionics, 2024) Ahmetli, G.; Ozgan, A.; Onen, V.; Kalem, M.; Goktepeli, G.; Yel, E.In this study, feedstock and energy recovery potential from fluid fraction of catalytic pyrolysis of poly(ethylene terephthalate) plastic waste in the presence of marble processing effluent physico-chemical sludge catalyst were investigated. The contribution of the study is both symbiotic disposal of two kinds of wastes and produced valuable products. The pyrolysis fluid products obtained at 300–700 °C and 10–50% catalyst dose were inquired via chemical, thermogravimetric and chromatographic means. Main recoverable compounds were in the benzene group, followed by the esters, alcohols and ketones. The variety of organic components in pyrolytic gas was detected in aliphatic compounds (alkanes and alkenes) followed by the oxygenated organics and aromatic compounds. Benzoic acid, Methanone diphenyl(benzophenone), 1,1biphenyl, 9H Fluorene, Octane, Methyl benzene, some Benzene and Heptene derivatives were the components that are easily recoverable from the pyrolytic fluids. All these recoverable components are economically important feedstocks utilized in industrial processes. Optimization of recovery and enrichment methods of these compounds is recommended for further study. More thermally stable products formed and the higher final thermal residue of pyrolytic oil and oligomer products were obtained at higher pyrolysis temperatures. Their T5, T10 and T50 values varied between 36–44, 44–54, and 72–84 °C, respectively, while they were 131–154, 141–160 and 217–313 °C for oligomers. Calorific values of the produced oligomers were in the range of 5541–6984 cal/g. This study indicated that the thermochemical degradation of poly(ethylene terephthalate) with marble sludge catalyst is important approach for material and energy recovery in terms of fluid products of the process. © The Author(s) under exclusive licence to Iranian Society of Environmentalists (IRSEN) and Science and Research Branch, Islamic Azad University 2024.Master Thesis Sürdürülebilir Kömür Madenciliği Üzerine Yaşam Döngüsü Değerlendirmesi(2025) Özcan, Mustafa Emre; Önen, VildanBu tez çalışmasında, Türkiye Kömür İşletmeleri'ne (TKİ) ait toplam 10 kömür sahasında yürütülen madencilik faaliyetlerinin çevresel etkileri, yaşam döngüsü analizi (YDA) metodolojisi kullanılarak değerlendirilmiştir. Söz konusu sahalardan 9'u açık ocak, 1'i ise yer altı işletme yöntemine sahiptir. Sahalar, Ege (3 saha), Marmara (3 saha), İç Anadolu (3 saha) ve Doğu Anadolu (1 saha) bölgelerinde konumlanmıştır. Kömürün çıkarımından termik santrale sevk edilmesine kadar olan süreç, SimaPro yazılımı aracılığıyla ISO 14040 ve ISO 14044 standartları doğrultusunda modellenmiş; ReCiPe etki değerlendirme yöntemiyle süreçlerin çevresel yükleri kapsamlı bir şekilde ortaya konmuştur. YDA kapsamında enerji tüketimi, sera gazı emisyonları, asidifikasyon potansiyeli, insan sağlığına etkileri, su kullanımı ve ekotoksisite gibi çevresel etki kategorileri dahil olmak üzere 17 ayrı kategori değerlendirilmiştir. Analiz sonuçları, kömür madenciliği faaliyetlerinin özellikle iklim değişikliği ve fosil kaynak tüketimi açısından yüksek çevresel baskı yarattığını ortaya koymuştur. Bu doğrultuda, çevresel etkilerin azaltılmasına yönelik üç iyileştirme senaryosu geliştirilmiştir: Üzerinde madencilik faaliyeti bulunmayan sahaların güneş enerji santrali (GES) kurulumu için değerlendirilmesi, dizel yakıtla çalışan iş makinelerinin elektrik tahrikli sistemlerle değiştirilmesi ve iş makinalarında dizel yerine biyodizel kullanılması. Senaryolar, mevcut duruma kıyasla potansiyel çevresel etkilerde ne ölçüde iyileştirme sağlanabileceğini göstermek amacıyla ayrı ayrı modellenmiş ve karşılaştırılmıştır. Bulgular, her üç senaryonun da çevresel performansı iyileştirme potansiyeline sahip olduğunu ortaya koymakta; bu bağlamda çalışma, Türkiye'de kömür madenciliği süreçlerinin sürdürülebilirlik perspektifinden yeniden yapılandırılması için önemli girdiler sunmaktadır.Article The Effect of Fly Ash in Dewatering of Marble Processing Wastewaters(2019) Taner Hasan Ali; Önen VildanArticle Catalytic Co-Pyrolysis of PET/PP Plastics and Olive Pomace Biomass with Marble Sludge Catalyst(2025) Kalem, Merve Sogancioglu; Yel, Esra; Goktepelı, Gamze; Önen, Vildan; Ahmetli, Gulnare; Özgan, AfraSürdürülebilir ve etkili atık yönetimi, çeşitli atık türlerine simbiyotik çözümlerin dahil edilmesini ve böylece dairesel ekonomiye ulaşılmasını gerektirir. Bu motivasyonla, bu çalışmada, plastiklerin, biyokütlenin ve mermer işleme atıklarının fizikokimyasal arıtma çamurunun (K1) kombine termokimyasal dönüşümü (pirolizi) incelenmiştir. Bu kombinasyonda, plastikler petrol bazlı sentetik aromatik (PET) ve alifatik (PP) organikler iken, zeytin posası-OP doğal tarımsal kalıntıdır. K1, literatüre ilk olarak yazarlar tarafından piroliz katalizörü olarak tanıtılan mineral üründür. Çalışmada, polimerlerin ve biyokütlenin eş pirolizi, CaCO3 içeren mineral atık tarafından katalize edilmiştir. Plastik türünün ve pirolize edilmiş malzeme karışım oranının piroliz fraksiyonları üzerindeki etkisi araştırılmıştır. Ayrıca, piroliz fraksiyonlarından malzeme geri kazanım potansiyeli tartışılmıştır. Katalitik ko-pirolizde, karışımdaki plastik oranının artırılmasıyla pirolitik sıvı ve oligomer fraksiyonu artarken katı (char) ve gaz fraksiyonu azaldı. %70PP+%15OP+%15K1 karışımı için sıvı ürün baskındı, %60PET+%20OP+%20K1 ile ise çok daha fazla pirolitik gaz fraksiyonu üretildi. Char ürünlerinin termal bozunması 600°C'ye kadar %2-3'ü geçmedi ve bu kararlılık yaklaşık 700°C'ye kadar devam etti, char'ın yüksek termal dirence sahip bir malzeme olarak alternatif alanlarda kullanılma potansiyelini ortaya koydu. Katalitik ko-piroliz sıvı ürünleri alkanlar, alkenler, asitler, fenoller, benzen, aldehitler, esterler, alkoller, ketonlar içerir. Sıvılarda benzen, asit ve alkol grupları baskınken, gazlarda alkan, alken ve alkin grupları baskındı.Article Citation - WoS: 3Citation - Scopus: 2Environmentally Friendly Alternative Depressants in Chalcopyrite Flotation(Taylor & Francis Inc, 2024) Taner, Hasan Ali; Önen, VildanEfficient and eco-friendly technologies are required to reduce the environmental effects of the beneficiation plants. Recently, there has been an interest in environmentally friendly alternative depressants. This study explored the effects of various depressants (AERO633, AERO7260, DP3124, DP3125, carboxymethyl cellulose (CMC), Cyquest4000, and sodium silicate) on chalcopyrite flotation. The experimental results indicated that AERO7260 has the best effect on chalcopyrite flotation, and the dosage is 50 g/t, it can improve the chalcopyrite recovery up to 93.35% as well as chalcopyrite grade up to 36.97%. Meanwhile, AERO7260 had an obvious depression effect on pyrite, reducing pyrite grade to 61.10% and pyrite recovery to 3.35%. Given its low reagent dosage and high selectivity, AERO7260 is a promising depressant that can be used for chalcopyrite flotation. The use of organic depressants will significantly aid the transition to ecologically friendly and sustainable processes. This study shows that organic depressants in chalcopyrite flotation can replace the existing inorganic depressants used in the depression of gangue minerals and that metals can be recovered at high performance by processing appropriately.
- «
- 1 (current)
- 2
- 3
- »