Profile URL: https://hdl.handle.net/20.500.13091/11929
Job Title:Prof. Dr.
Email Address:vonen@ktun.edu.tr
Main Affiliation:02.12. Department of Mining Engineering
Status: Current Staff
ORCID:
0000-0002-8139-8385
0000-0002-8139-8385Scopus ID:
35776889700
35776889700YÖK Akademik: 3F8C2BDB5AE3475B
Google Scholar:
O8ZbGdcAAAAJ
O8ZbGdcAAAAJWeb of Science ID:
DXB-0902-2022
DXB-0902-2022Name Variants:
Önen, Vi̇ldan Onen, Vildan
24 results
Scholarly Output Search Results
Now showing 1 - 10 of 24
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.Master Thesis Farklı Polimerler ile Kırmızı Çamur Süspansiyonlarının Flokülasyon Karakteristiklerinin Belirlenmesi(Konya Teknik Üniversitesi, 2024) Solak, Naci̇ye; Önen, Vi̇ldanBu çalışmanın amacı, kırmızı çamur artıklarının susuzlandırılmasında yaygın olarak kullanılan polielektrolitler yerine alternatif doğal polimer türlerinin belirlenmesidir. Bu amaçla Türkiye'de boksit cevherinden alüminyum elde eden tek entegre fabrika olan Konya Seydişehir Eti Alüminyum A.Ş. kırmızı çamur artıkları için biyopolimerler ile susuzlandırma çalışmaları gerçekleştirilmiştir. Flokülasyon deneyleri için biyopolimer olarak: çitosan, lignin ve kitin kullanılmıştır. Sonuçların karşılaştırılması amacıyla anyonik, katyonik ve noniyonik polimerlerle de deneyler gerçekleştirilmiştir. Ayrıca susuzlandırmada son yılarda yaygın olarak kullanılan Poli Alüminyum Klorür Hidroksit Sülfat (PACS) ile de deneyler gerçekleştirilmiştir. Optimum konsantrasyonlar ve sonuç bulanıklıkları anyonik, katyonik ve noniyonik flokülantlar için sırasıyla (10 dk çökelme süresi için); 1,1mg/L-9,2NTU; 9 mg/L-6,6 NTU; 8 mg/L-36 NTU olarak belirlenmiştir. Çalışılan biyopolimerlerden en etkili sonucu çitosan vermiştir ve optimum sonuçlar (30 dk çökelme süresi için), 10 mg/L-43,6 NTU (%95 verim) olarak belirlenmiştir. Çitosan'ın etkinliğini artırmak için demir III klorür ve alüminyum sülfat ile dual flokülasyon deneyleri gerçekleştirilmiş ve 8 mg/L çitosan + 100 mg/L Al2(SO4)3 ile 28,6 NTU sonuç bulanıklık değerine ulaşılmıştır. PACS'ın genel olarak çok hızlı bir şekilde çökelme sağlamakla birlikte oldukça yüksek hacimli ve gevşek bir çamur oluşumuna neden olduğu gözlenmiştir. Sonuç olarak biyopolimerlerin polielektrolitler kadar etkin olmadığı ancak sürdürülebilir çevre için alternatif bir yaklaşım olarak araştırmaya değer olduğu sonucuna varılmıştır.Article Citation - WoS: 2Citation - Scopus: 2Evaluation of the Effect of the Main Parameters on Chalcopyrite Flotation in the Presence of Kaolinite and Montmorillonite(Journal Of Central South Univ, 2023) Taner, Hasan Ali; Onen, VildanClay minerals are known to negatively affect sulfur flotation. In the present study, the effect of clay minerals (kaolinite-montmorillonite) on chalcopyrite flotation was investigated and it was aimed to propose solutions to eliminate the negative effects. In the experimental studies, ?-potential measurements and flotation experiments were carried out. The central composite design method was used in the flotation experiments and the independent variables were selected as frother concentration, dispersant concentration, froth height, air flow rate and amount of clay. In the evaluation of the test results, 5 important variables were determined as dependent variables. While the chalcopyrite grade decreased as the amount of clay increased, and chalcopyrite recovery, pyrite recovery and dynamic froth stability increased. The negative interaction order was determined as montmorillonite>kaolinite in terms of chalcopyrite flotation. Larger bubble diameter was obtained with montmorillonite. The flotation conditions that can be applied for the clay type (kaolinite and montmorillonite) found in the ore are mathematically modeled. Thus, the changes of the conditions in the model depending on the clay ratio that changes over time in the ore and the predictability of the grade-recovery values that can be obtained as a result of flotation will be ensured.Article Citation - WoS: 13Citation - Scopus: 12Mechanism of Mechanical Entrainment in Chalcopyrite Flotation: Effects of Clay Minerals(Springer Science and Business Media Deutschland GmbH, 2023-12-29) 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, 2022-05-25) 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, 2024-02-10) 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.Article Citation - WoS: 2Citation - Scopus: 3The Effect of Different Clay Minerals on the Flotation Kinetics of Chalcopyrite(Technical University of Kosice, 2022-12-08) Taner, H.A.; Önen, V.This study investigated the effects of clay minerals (montmorillonite, illite, and kaolinite) on chalcopyrite recovery and flotation kinetic parameters. Classical first-order flotation kinetic model was applied as a function of froth height and amount of clay minerals to fit overall flotation results on chalcopyrite recovery against flotation time. Clay minerals enhanced chalcopyrite recovery by mechanical entrainment and slime coating of valuable chalcopyrite particles. Flotation tests have shown that the deleterious impact of clay minerals on the chalcopyrite flotation is enhanced as follows: montmorillonite>kaolinite>illite. Montmorillonite significantly raised viscosity and also considerably diminished chalcopyrite grade. Recovery and selectivity were lower for montmorillonite than kaolinite and illite. The adjunct of illite was of little effect on chalcopyrite flotation kinetics. The obtained flotation rate constants indicate that clay minerals are carried to the concentrate together with the chalcopyrite. The flotation rate constants increased with increasing the amount of all clay minerals. Slime minerals easily entered to concentrate by mechanical entrainment, and the inhibition effect of clay particles on chalcopyrite became more obvious with increasing flotation time. However, the negative effect of clay minerals is reduced with high froth height. © 2022 by the authors.Article Thermochemical Treatment of Waste Polypropylene (PP) Using Marble Sludge as Catalyst-II: Evaluation of Chemicals Recovery Potential From Pyrolytic Fluids(Sage Publications Ltd, 2026) Kalem, Merve; Ozgan Kurt, Afra; Goktepeli, Gamze; Onen, Vildan; Ahmetli, Gulnare; Yel, EsraIn this study, waste polypropylene (PP) was pyrolysed together with marble processing industry effluents physicochemical treatment sludge (named as K1) catalyst, and the valuable component recovery and usage potential from resulting liquid and gaseous products were investigated. In the fixed bed pyrolysis reactor under inert conditions with N2 gas, the studied experimental variables were temperature and mixing ratio. The resultant liquid and gaseous fractions were characterized via GC-MS, Fourier transform infrared, thermogravimetric analysis and calorific value analyses. Liquid products contain predominantly paraffinic and olefinic, but minor aromatic hydrocarbons (HCs) and also minor amounts of oxygenated compounds with 20-30% K1 catalyst. Heating values of the liquid products were around 10 kcal.g-1. The gas products predominantly contain alkanes, alkenes and aromatic HC compounds with economic value such as benzene isotridecanol, heptanol, ketone and terpene. Ca and Mg carbonate structure of K1 catalyst increased the compound diversity in the pyrolysis gas, especially in the aliphatic groups. The detected low C number alkane compounds were pentane, heptane, cyclohexane and high C number long-chain n-alkane aliphatic compounds were docosane, hexacosane and hexatriacontane. The recoverable compounds are economically and environmentally important as they can be used in many industries such as cleaning, cosmetics, pharmacology and petrochemistry as feedstock. The proposed pyrolysis provided symbiotic solution to these two types of wastes and the resultant products of this application have potential for energy and compound recovery. Recovery methods can be further studied.Article Citation - WoS: 5Citation - Scopus: 5Combined Use of Bwm-Topsis Methods in the Selection of Thermal Power Plant Installation Site in the Karapinar/Turkiye Region, at Risk of Sinkhole Formation(Springer Science and Business Media Deutschland GmbH, 2023-12-26) Gumussoy, A.D.; Onen, V.; Yalpir, S.With the rapidly increasing world population and the need for industrialization, energy supply has become an important global problem. A significant part of the world's energy needs is provided by fossil fuels. About half of all global coal deposits are low-quality coals, including lignite. Karapınar/Konya, also the study area, has Turkiye's second richest lignite reserve. The region's lignite reserve can be used in thermal power plants for electricity generation in terms of its nature and the amount is an important opportunity to meet the energy demand for both region and country. The region contains many sinkholes, and the potential for the formation of new sinkholes makes the site selection for thermal power plants in the region an even more strategic decision. This study aims to propose the most suitable thermal power plant site for the region by using Multi-Criteria Decision Making methods and Geographic Information Systems in an integrated way. Within the scope of the study, a total of twelve sub-criteria were taken into consideration under the main criteria of Geological, Economic and Environmental. The Best–Worst Method was applied to determine the criteria weights, and by using the weights, a suitability map for the thermal power plant installation site was produced and candidate regions were determined. TOPSIS was applied to determine the most suitable location among the candidate regions. The Candidate Region in the easternmost part of Karapinar district was chosen as the most suitable site for the thermal power plant installation. © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
- «
- 1 (current)
- 2
- 3
- »
Research Topics
Domains
Physical Sciences
Fields
Environmental ScienceEngineering
Subfields
Water Science and TechnologyMechanical EngineeringBiomedical Engineering
Specific Research Areas
Minerals Flotation and Separation Techniques
Mineral Processing and Grinding
Thermochemical Biomass Conversion Processes
Metal Extraction and Bioleaching
Adsorption and biosorption for pollutant removal
Sustainable Development Goals
12RESPONSIBLE CONSUMPTION AND PRODUCTION
7
Research Products
6CLEAN WATER AND SANITATION
7
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
6
Research Products
7AFFORDABLE AND CLEAN ENERGY
4
Research Products
13CLIMATE ACTION
1
Research Products
11SUSTAINABLE CITIES AND COMMUNITIES
1
Research Products
2ZERO HUNGER
1
Research Products
4QUALITY EDUCATION
1
Research Products
14LIFE BELOW WATER
1
Research Products
Documents
23
Citations
142
h-index
8
Documents
15
Citations
103
Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Konya Technical University | 16 |
| Selçuk University | 8 |
| Çanakkale Onsekiz Mart Üniversitesi | 1 |
| Dokuz Eylül University | 1 |
| Niğde Ömer Halisdemir Üniversitesi | 1 |
1 / 1
Data obtained from OpenAlex
| 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
Scholarly Output
24
Articles
18
Views / Downloads
115/126
Supervised MSc Theses
5
Supervised PhD Theses
1
WoS Citation Count
62
Scopus Citation Count
55
Patents
0
Projects
0
WoS Citations per Publication
2.58
Scopus Citations per Publication
2.29
Open Access Source
9
Supervised Theses
6
Scopus Quartile Distribution
Competency Cloud
