ABSTRACT The influence of microwave radiation on sulphide minerals in inert atmosphere has been i... more ABSTRACT The influence of microwave radiation on sulphide minerals in inert atmosphere has been investigated with respect to their processing characteristics such as magnetic susceptibility and floatability. Pure sulphide mineral samples were prepared in different size fractions. Microflotation tests were performed and magnetic susceptibilities of samples were measured after treating with microwave energy in inert atmosphere at three power levels for six time intervals. Possible modifications on the mineral surfaces due to microwave energy and exposure time were evaluated by XRD and optical microscopy. The results showed that selective separation of sulphide minerals in terms of floatability and magnetic separation could be possible.
The effects of microwave treatment on the floatabilities and magnetic susceptibilities of some su... more The effects of microwave treatment on the floatabilities and magnetic susceptibilities of some sulfide minerals, namely, pyrite, chalcopyrite, galena and sphalerite, were studied. Pure mineral samples were prepared in-425+212f.lm,-212+106-f.lm and-106+38-f.lm size fractions. Microflotation and magnetic separation tests were carried out on the samples after microwave treatment at 600,950 and 1,300 Watts for 5,20,60,90,120 and 240 seconds. The maximum temperature values of the samples were measured during the microwave treatment, and possible alterations on the mineral surfaces were determined by X-ray diffraction (XRD) analysis. The effects of microwave treatment are discussed based on the result of microflotation and magnetic separation tests. The results revealed that pyrite, chalcopyrite and galena were heated very quickly and that their surface temperatures reached _700° to 900°C, while the temperature of sphalerite reached only-J30°c. The floatability of pyrite, chalcopyrite and galena were decreased when microwave energy and the duration of treatment were increased, owing to oxidation of the mineral surfaces caused by relatively high temperature. As expected, there was no change in the floatability of sphalerite. The magnetic properties of pyrite and chalcopyrite were improved by the increase in microwave energy and the duration of treatment to such an extent that 90% of the feed separated as magnetic product. But no change was observed in the magnetic properties of galena and sphalerite.
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Bu çalışmada, Mihalıççık-Eskişehir bölgesine ait lateritik bir nikel cevherinin detaylı mineraloj... more Bu çalışmada, Mihalıççık-Eskişehir bölgesine ait lateritik bir nikel cevherinin detaylı mineralojisi ve zenginleştirme olasılıkları araştırılmıştır. Cevherin kantitatif mineralojik analizi MLA (Mineral Liberation Analyzer) kullanılarak yapılmış; ernienikelit ve pimelit mineralleri nikel taşıyıcı mineraller olarak belirlenmiştir. Cevherin yerçekimi ile zenginleştirmeye uygunluğunu belirlemek için ağır sıvı testi yapılmıştır. Zenginleştirme çalışmaları kapsamında optik ayırma, kuru ve yaş manyetik ayırma ve mikrodalga ile ısıtma yöntemleri uygulanmıştır. Testler sonucunda nikel tenöründe kayda değer bir iyileşme gerçekleşmemiştir. Yalnızca mikrodalga ile ısıtılan cevherin arsenik tenöründe bir miktar düşüş gözlenmiştir. Ernienikelitlerin çok ince silikatlar (genellikle kil ve Si oksitler) ile bağlı formda bulunması, fiziksel zenginleştirme yöntemleri ile cevherin kolaylıkla zenginleştirilemeyeceğini desteklemektedir.
Varied types/geometries of stirred mills have been produced by different manufacturers, and the c... more Varied types/geometries of stirred mills have been produced by different manufacturers, and the comparison task has been accomplished for some of the technologies, i.e., Tower mill vs IsaMill. However, the main drawbacks of these comparisons were the uncommon characteristics of the milling environment, such as media size. In this study, HIGMill and IsaMill, which were vertically and horizontally chamber oriented, respectively, were compared for a regrinding process of copper ores with similar characterization and almost the same milling environment. Detailed characterization studies of the two ore types, such as work index, ore breakage and chemical composition, were performed. Modeling of the two mills was also performed to show the variation in the rate of breakage parameters. The entire assessments were based on comparing the signature plots, energy and shape of the product size distribution as well as the stress analyses. The results showed that HIGMill and IsaMill technologies ...
Physicochemical Problems of Mineral Processing, 2018
This study was aimed to utilize column flotation to obtain much cleaner concentrate in the Cu cir... more This study was aimed to utilize column flotation to obtain much cleaner concentrate in the Cu circuit. However, the numbers of equipment and the proper streams for column application should be the key for successful operation. Therefore, the effects of some operational parameters such as wash water rate, airflow rate and froth height were investigated on the streams of namely Cu first cleaner concentrate, Cu rougher concentrate and Cu third cleaner concentrate in terms of mineral recoveries and selectivity. Distribution of wash water rate to products was also determined by a tracer test method. Optimum operating conditions and accordingly performance of the column were determined by simulation studies. According to the results, the suitable streams for industrial scale flotation column are advised as the rougher concentrate and/or first cleaner concentrate. With series installation of columns, it is possible to obtain two different concentrates which include 22% Cu, 4% Zn and 17% Cu...
Bu calismada Karadeniz bolgesinde bulunan masif sulfurlu Cu-Au cevherinden yer cekimi ile zenginl... more Bu calismada Karadeniz bolgesinde bulunan masif sulfurlu Cu-Au cevherinden yer cekimi ile zenginlestirme yontemleri kullanilarak altin kazanimi amaclanmistir. Yer cekimi ile zenginlestirme calismalarinda Falcon zenginlestiricisi ile sallantili masa kullanilmistir. MLA (Mineral serbestlesme analizi) sonuclarina gore Cu-Au cevheri cogunlukla pirit/markasit, barit, sfalerit, kalkopirit ve kuvars minerallerini icermektedir. Altinin iri boylarda Au-Ag alasimi formunda (elektrum), daha ince boylarda ise nabit formda olustugu ve altin iceren minerallerin genellikle pirit/markasit ile birlikte bulundugu belirlenmistir. Falcon zenginlestiricisi testleri, Cu-Au zenginlestirme tesisinin farkli akis kollarindan alinan numunelerle gerceklestirilmistir. Falcon konsantrelerinin altin tenorunu arttirmak icin, sallantili masa kullanilmistir. Falcon ile testler uc farkli G kuvvetinde yapilmistir. G kuvveti arttikca konsantre veriminin arttigi, tenorunun ise dustugu belirlenmistir. Yapilan deneysel ca...
Physicochemical Problems of Mineral Processing, 2019
Selection of a proper concentration method for a sustainable production of antimony metal from an... more Selection of a proper concentration method for a sustainable production of antimony metal from an ore deposit has its unique challenges and crucial of importance due to the growing use of antimony compounds and increasing strategic importance. Therefore, detailed laboratory scale beneficiation studies of a complex stibnite ore and modeling & simulation studies based on the experimental results were investigated within this study. Quantitative mineralogical characterization, chemical analyses, sieve tests and the heavy liquid tests were performed in the scope of ore characterization. Froth flotation, gravity concentration, electrostatic separation and ore sorting were conducted to introduce the best possible flowsheet for the individual industrial sample. It was concluded that heavy medium separation would be the only method can be used for subjected stibnite ore. Therefore, four conjectural beneficiation scenarios were tested by simulation studies for the cases proposedly allowing t...
Bu çalışmada, Mihalıççık-Eskişehir bölgesine ait lateritik bir nikel cevherinin detaylı mineraloj... more Bu çalışmada, Mihalıççık-Eskişehir bölgesine ait lateritik bir nikel cevherinin detaylı mineralojisi ve zenginleştirme olasılıkları araştırılmıştır. Cevherin kantitatif mineralojik analizi MLA (Mineral Liberation Analyzer) kullanılarak yapılmış; ernienikelit ve pimelit mineralleri nikel taşıyıcı mineraller olarak belirlenmiştir. Cevherin yerçekimi ile zenginleştirmeye uygunluğunu belirlemek için ağır sıvı testi yapılmıştır. Zenginleştirme çalışmaları kapsamında optik ayırma, kuru ve yaş manyetik ayırma ve mikrodalga ile ısıtma yöntemleri uygulanmıştır. Testler sonucunda nikel tenöründe kayda değer bir iyileşme gerçekleşmemiştir. Yalnızca mikrodalga ile ısıtılan cevherin arsenik tenöründe bir miktar düşüş gözlenmiştir. Ernienikelitlerin çok ince silikatlar (genellikle kil ve Si oksitler) ile bağlı formda bulunması, fiziksel zenginleştirme yöntemleri ile cevherin kolaylıkla zenginleştirilemeyeceğini desteklemektedir.
Yerbilimleri/Hacettepe Üniversitesi Yerbilimleri Uygulama ve Araştırma Merkezi Dergisi, 2018
Zenginleştirme tesislerinin tasarımı ve optimizasyonu çalışmalarında cevher yatağının mineralojis... more Zenginleştirme tesislerinin tasarımı ve optimizasyonu çalışmalarında cevher yatağının mineralojisi çok önemli bir yere sahiptir. Zenginleştirme tesisinin farklı noktalarından alınan cevher örneklerine uygulanan detaylı mineralojik analizler sayesinde, zenginleştirme performansını sınırlayan ana etkenler ve performansın artırılabilmesi için yapılması gereken düzenlemeler hakkında yorum yapılabilmektedir. Bu çalışmada, altın içeren kompleks bakır-arsenikli sülfürlü cevherin işlendiği bir flotasyon tesisinin performansı detaylı kantitatif mineraloji verileri kullanılarak değerlendirilmiştir. Flotasyon tesisinin beslemesi, bakır ve pirit konsantreleri ve bakır süpürme artığı akışlarından numuneler alınarak kimyasal ve mineralojik analizler yapılmış, QemSCAN ile ayrıca konsantrelerdeki altının davranımı da incelenmiştir. Flotasyon beslemesinin mineralojik analiz sonuçları minerallerin serbestleşme derecesinin-45 µm'de ancak %60 seviyesine ulaştığını göstermiş, dolayısıyla daha ince tane boyuna öğütülen bir flotasyon beslemesiyle bakır veriminin artabileceği öngörülmüştür. Bakır konsantresinin ise serbest pirit taneleriyle kirlendiği belirlenmiş, buna göre flotasyon işletme koşullarının da gözden geçirilmesi gerektiği ortaya çıkmıştır. Devrede bakır kaybı açısından en önemli akışın süpürme flotasyonu artığı olduğu ve bu kaybın özellikle en ince tane boyunda ve serbest formda olduğu belirlenmiştir. Cevherde bulunan altın tanelerinin ise daha çok nabit formda olduğu, %80'ininin 20 µm'den küçük ve genellikle pirit ve enargitle bağlı bulunduğu gözlenmiştir.
XVIII International Coal Preparation Congress, 2016
In this paper, the application of density tracers for performance prediction of dense medium circ... more In this paper, the application of density tracers for performance prediction of dense medium circuits and the strategies for identification of potential problems in operating plants are outlined, and the results obtained at various performance prediction and evaluation studies performed in various coal washing plants are summarized. Based on the performance data and their interpretation, the potential problems in existing operations are identified, and strategies and comments are given for optimum operation. The performance prediction tests using density tracers enabled the identification of inadequacies in operating dense medium drums, the quantification of retention phenomena in dense medium cyclones and indicating the importance of equally distribution of flows. Additionally, the results of the density tracer tests down to 2 mm are given which is valuable being one of the very few studies ever conducted at such fine sizes.
The possibilities of the production of high quality potassium feldspar in ceramics and porcelain ... more The possibilities of the production of high quality potassium feldspar in ceramics and porcelain industry from Kirşehir district (Balişeyh, Ağaçören, Başköy) were investigated. The results showed that it is possible to produce a first quality K-feldspar containing %10,4-11,5 K20, %2,1-2,8 Na20, %0,6-1,3 CaO, %0,01-0,2 MgO, %0,18-0,24 Fe203 and %0,01-0,03 Ti02 from coarse fractions which were wet screened and ground to -0,6 mm by dry magnetic separation. Moreover, high quality K-feldspar containing %13,01 K20, %2,28 Na20, %0,61 CaO, %0,01 MgO, % 0,16 Fe203 ve %0,002 Ti0 2 was also produced from the samples taken from Balişeyh, Beyobasi district by flotation. The undersize fraction (-5,6 mm) which is not suitable for production of high quality potassium feldspar can be used as plaster sand and slime fraction (-75 urn) may be used as raw material in brick and tile production.
Mineral Processing and Extractive Metallurgy, 2005
He obtained his MSc in 1990 and PhD in 1995 from the same department. He is currently Associate P... more He obtained his MSc in 1990 and PhD in 1995 from the same department. He is currently Associate Professor in the mineral processing division of the department.
Mineral Processing and Extractive Metallurgy Review, 2010
ABSTRACT In this study a sampling survey was carried out in JSC Madneuli copper flotation plant t... more ABSTRACT In this study a sampling survey was carried out in JSC Madneuli copper flotation plant to improve metallurgy by using process mineralogy. Size-by-size mineralogical analyses were performed for some critical streams around rougher, scavenger and cleaner banks by optic image analyzer system. With quantitative data, it was possible to indicate the reasons of dilution in the final copper concentrate and copper loss in the tail. It was found that 18.2% of total copper was lost from tail particularly from finest size as chalcocite. Also, batch flotation tests of some critical streams were performed during and after the sampling survey to evaluate the efficiency of the operating conditions in the plant. These tests showed that increasing the residence time and adding extra collector will result in an increase up to 20% of copper recovery improvement in scavenger bank while it will be 95% in cleaner bank without any decrease in grade. Based on the mineralogical results, regrinding was proposed for particularly cleaner tail as it consisted of mostly coarse and locked particles.
Water shortages have a direct impact on the life of many mining and mineral processing operations... more Water shortages have a direct impact on the life of many mining and mineral processing operations. Therefore, a good understanding of the effects of water quality on flotation performance is essential. In this study, effects of dissolved ions (both anions and cations) were investigated on the flotation performance of a Cu-Zn complex sulfide ore from Çayeli Bakır İşletmeleri A.Ş. (CBI)
This paper describes a study of the relationship between the physical, chemical and mineralogical... more This paper describes a study of the relationship between the physical, chemical and mineralogical parameters of cement products obtained by different grinding mechanisms namely high pressure grinding rolls (HPGR) and ball milling, and their effects upon the properties of cements prepared from the ground clinker. Samples were prepared as narrow size fractions and also as distribution samples. Characterization parameters were ascertained by using XRF, laser sizing, Blaine and BET surface area and image analysis methods. HPGR grinding resulted in higher degrees of liberation of clinker phases arising from the intergranular breakage along the grain boundaries compared to ball mill grinding. As for service properties, water demand of HPGR products was higher than ball mill products resulting from high micro fissured structure. Despite high liberation of particularly alite mineral in HPGR grinding, the compressive strength of ball mill products was slightly higher than HPGR products for narrow size samples. Finally, particle size distribution effect on strength was more obvious for distribution samples; generally ball milling gave higher strength values.
Different milling conditions, such as wet or dry, and use of different grinding media have a grea... more Different milling conditions, such as wet or dry, and use of different grinding media have a great impact on the flotation performance of sulphide minerals. In the present study, the effects of wet and dry grinding and the use of different grinding media, such as mild steel (MS) and stainless steel (SS), were investigated on a Cu-sulphide ore. The samples were ground as dry and wet with both grinding media, to a P80 value of −75 µm, and then flotation was carried out under the same conditions. The obtained data from flotation were evaluated in terms of solid/water recovery, chalcopyrite/pyrite recovery and separation efficiency. The effects of different milling conditions were discussed with the measured chemical parameters such as redox potential and dissolved oxygen level together with the flotation rate of chalcopyrite. The redox potential of the dry ground ore, irrespective of the type of milling media, was measured considerably higher than the wet grinding conditions. With SS m...
ABSTRACT The influence of microwave radiation on sulphide minerals in inert atmosphere has been i... more ABSTRACT The influence of microwave radiation on sulphide minerals in inert atmosphere has been investigated with respect to their processing characteristics such as magnetic susceptibility and floatability. Pure sulphide mineral samples were prepared in different size fractions. Microflotation tests were performed and magnetic susceptibilities of samples were measured after treating with microwave energy in inert atmosphere at three power levels for six time intervals. Possible modifications on the mineral surfaces due to microwave energy and exposure time were evaluated by XRD and optical microscopy. The results showed that selective separation of sulphide minerals in terms of floatability and magnetic separation could be possible.
The effects of microwave treatment on the floatabilities and magnetic susceptibilities of some su... more The effects of microwave treatment on the floatabilities and magnetic susceptibilities of some sulfide minerals, namely, pyrite, chalcopyrite, galena and sphalerite, were studied. Pure mineral samples were prepared in-425+212f.lm,-212+106-f.lm and-106+38-f.lm size fractions. Microflotation and magnetic separation tests were carried out on the samples after microwave treatment at 600,950 and 1,300 Watts for 5,20,60,90,120 and 240 seconds. The maximum temperature values of the samples were measured during the microwave treatment, and possible alterations on the mineral surfaces were determined by X-ray diffraction (XRD) analysis. The effects of microwave treatment are discussed based on the result of microflotation and magnetic separation tests. The results revealed that pyrite, chalcopyrite and galena were heated very quickly and that their surface temperatures reached _700° to 900°C, while the temperature of sphalerite reached only-J30°c. The floatability of pyrite, chalcopyrite and galena were decreased when microwave energy and the duration of treatment were increased, owing to oxidation of the mineral surfaces caused by relatively high temperature. As expected, there was no change in the floatability of sphalerite. The magnetic properties of pyrite and chalcopyrite were improved by the increase in microwave energy and the duration of treatment to such an extent that 90% of the feed separated as magnetic product. But no change was observed in the magnetic properties of galena and sphalerite.
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Bu çalışmada, Mihalıççık-Eskişehir bölgesine ait lateritik bir nikel cevherinin detaylı mineraloj... more Bu çalışmada, Mihalıççık-Eskişehir bölgesine ait lateritik bir nikel cevherinin detaylı mineralojisi ve zenginleştirme olasılıkları araştırılmıştır. Cevherin kantitatif mineralojik analizi MLA (Mineral Liberation Analyzer) kullanılarak yapılmış; ernienikelit ve pimelit mineralleri nikel taşıyıcı mineraller olarak belirlenmiştir. Cevherin yerçekimi ile zenginleştirmeye uygunluğunu belirlemek için ağır sıvı testi yapılmıştır. Zenginleştirme çalışmaları kapsamında optik ayırma, kuru ve yaş manyetik ayırma ve mikrodalga ile ısıtma yöntemleri uygulanmıştır. Testler sonucunda nikel tenöründe kayda değer bir iyileşme gerçekleşmemiştir. Yalnızca mikrodalga ile ısıtılan cevherin arsenik tenöründe bir miktar düşüş gözlenmiştir. Ernienikelitlerin çok ince silikatlar (genellikle kil ve Si oksitler) ile bağlı formda bulunması, fiziksel zenginleştirme yöntemleri ile cevherin kolaylıkla zenginleştirilemeyeceğini desteklemektedir.
Varied types/geometries of stirred mills have been produced by different manufacturers, and the c... more Varied types/geometries of stirred mills have been produced by different manufacturers, and the comparison task has been accomplished for some of the technologies, i.e., Tower mill vs IsaMill. However, the main drawbacks of these comparisons were the uncommon characteristics of the milling environment, such as media size. In this study, HIGMill and IsaMill, which were vertically and horizontally chamber oriented, respectively, were compared for a regrinding process of copper ores with similar characterization and almost the same milling environment. Detailed characterization studies of the two ore types, such as work index, ore breakage and chemical composition, were performed. Modeling of the two mills was also performed to show the variation in the rate of breakage parameters. The entire assessments were based on comparing the signature plots, energy and shape of the product size distribution as well as the stress analyses. The results showed that HIGMill and IsaMill technologies ...
Physicochemical Problems of Mineral Processing, 2018
This study was aimed to utilize column flotation to obtain much cleaner concentrate in the Cu cir... more This study was aimed to utilize column flotation to obtain much cleaner concentrate in the Cu circuit. However, the numbers of equipment and the proper streams for column application should be the key for successful operation. Therefore, the effects of some operational parameters such as wash water rate, airflow rate and froth height were investigated on the streams of namely Cu first cleaner concentrate, Cu rougher concentrate and Cu third cleaner concentrate in terms of mineral recoveries and selectivity. Distribution of wash water rate to products was also determined by a tracer test method. Optimum operating conditions and accordingly performance of the column were determined by simulation studies. According to the results, the suitable streams for industrial scale flotation column are advised as the rougher concentrate and/or first cleaner concentrate. With series installation of columns, it is possible to obtain two different concentrates which include 22% Cu, 4% Zn and 17% Cu...
Bu calismada Karadeniz bolgesinde bulunan masif sulfurlu Cu-Au cevherinden yer cekimi ile zenginl... more Bu calismada Karadeniz bolgesinde bulunan masif sulfurlu Cu-Au cevherinden yer cekimi ile zenginlestirme yontemleri kullanilarak altin kazanimi amaclanmistir. Yer cekimi ile zenginlestirme calismalarinda Falcon zenginlestiricisi ile sallantili masa kullanilmistir. MLA (Mineral serbestlesme analizi) sonuclarina gore Cu-Au cevheri cogunlukla pirit/markasit, barit, sfalerit, kalkopirit ve kuvars minerallerini icermektedir. Altinin iri boylarda Au-Ag alasimi formunda (elektrum), daha ince boylarda ise nabit formda olustugu ve altin iceren minerallerin genellikle pirit/markasit ile birlikte bulundugu belirlenmistir. Falcon zenginlestiricisi testleri, Cu-Au zenginlestirme tesisinin farkli akis kollarindan alinan numunelerle gerceklestirilmistir. Falcon konsantrelerinin altin tenorunu arttirmak icin, sallantili masa kullanilmistir. Falcon ile testler uc farkli G kuvvetinde yapilmistir. G kuvveti arttikca konsantre veriminin arttigi, tenorunun ise dustugu belirlenmistir. Yapilan deneysel ca...
Physicochemical Problems of Mineral Processing, 2019
Selection of a proper concentration method for a sustainable production of antimony metal from an... more Selection of a proper concentration method for a sustainable production of antimony metal from an ore deposit has its unique challenges and crucial of importance due to the growing use of antimony compounds and increasing strategic importance. Therefore, detailed laboratory scale beneficiation studies of a complex stibnite ore and modeling & simulation studies based on the experimental results were investigated within this study. Quantitative mineralogical characterization, chemical analyses, sieve tests and the heavy liquid tests were performed in the scope of ore characterization. Froth flotation, gravity concentration, electrostatic separation and ore sorting were conducted to introduce the best possible flowsheet for the individual industrial sample. It was concluded that heavy medium separation would be the only method can be used for subjected stibnite ore. Therefore, four conjectural beneficiation scenarios were tested by simulation studies for the cases proposedly allowing t...
Bu çalışmada, Mihalıççık-Eskişehir bölgesine ait lateritik bir nikel cevherinin detaylı mineraloj... more Bu çalışmada, Mihalıççık-Eskişehir bölgesine ait lateritik bir nikel cevherinin detaylı mineralojisi ve zenginleştirme olasılıkları araştırılmıştır. Cevherin kantitatif mineralojik analizi MLA (Mineral Liberation Analyzer) kullanılarak yapılmış; ernienikelit ve pimelit mineralleri nikel taşıyıcı mineraller olarak belirlenmiştir. Cevherin yerçekimi ile zenginleştirmeye uygunluğunu belirlemek için ağır sıvı testi yapılmıştır. Zenginleştirme çalışmaları kapsamında optik ayırma, kuru ve yaş manyetik ayırma ve mikrodalga ile ısıtma yöntemleri uygulanmıştır. Testler sonucunda nikel tenöründe kayda değer bir iyileşme gerçekleşmemiştir. Yalnızca mikrodalga ile ısıtılan cevherin arsenik tenöründe bir miktar düşüş gözlenmiştir. Ernienikelitlerin çok ince silikatlar (genellikle kil ve Si oksitler) ile bağlı formda bulunması, fiziksel zenginleştirme yöntemleri ile cevherin kolaylıkla zenginleştirilemeyeceğini desteklemektedir.
Yerbilimleri/Hacettepe Üniversitesi Yerbilimleri Uygulama ve Araştırma Merkezi Dergisi, 2018
Zenginleştirme tesislerinin tasarımı ve optimizasyonu çalışmalarında cevher yatağının mineralojis... more Zenginleştirme tesislerinin tasarımı ve optimizasyonu çalışmalarında cevher yatağının mineralojisi çok önemli bir yere sahiptir. Zenginleştirme tesisinin farklı noktalarından alınan cevher örneklerine uygulanan detaylı mineralojik analizler sayesinde, zenginleştirme performansını sınırlayan ana etkenler ve performansın artırılabilmesi için yapılması gereken düzenlemeler hakkında yorum yapılabilmektedir. Bu çalışmada, altın içeren kompleks bakır-arsenikli sülfürlü cevherin işlendiği bir flotasyon tesisinin performansı detaylı kantitatif mineraloji verileri kullanılarak değerlendirilmiştir. Flotasyon tesisinin beslemesi, bakır ve pirit konsantreleri ve bakır süpürme artığı akışlarından numuneler alınarak kimyasal ve mineralojik analizler yapılmış, QemSCAN ile ayrıca konsantrelerdeki altının davranımı da incelenmiştir. Flotasyon beslemesinin mineralojik analiz sonuçları minerallerin serbestleşme derecesinin-45 µm'de ancak %60 seviyesine ulaştığını göstermiş, dolayısıyla daha ince tane boyuna öğütülen bir flotasyon beslemesiyle bakır veriminin artabileceği öngörülmüştür. Bakır konsantresinin ise serbest pirit taneleriyle kirlendiği belirlenmiş, buna göre flotasyon işletme koşullarının da gözden geçirilmesi gerektiği ortaya çıkmıştır. Devrede bakır kaybı açısından en önemli akışın süpürme flotasyonu artığı olduğu ve bu kaybın özellikle en ince tane boyunda ve serbest formda olduğu belirlenmiştir. Cevherde bulunan altın tanelerinin ise daha çok nabit formda olduğu, %80'ininin 20 µm'den küçük ve genellikle pirit ve enargitle bağlı bulunduğu gözlenmiştir.
XVIII International Coal Preparation Congress, 2016
In this paper, the application of density tracers for performance prediction of dense medium circ... more In this paper, the application of density tracers for performance prediction of dense medium circuits and the strategies for identification of potential problems in operating plants are outlined, and the results obtained at various performance prediction and evaluation studies performed in various coal washing plants are summarized. Based on the performance data and their interpretation, the potential problems in existing operations are identified, and strategies and comments are given for optimum operation. The performance prediction tests using density tracers enabled the identification of inadequacies in operating dense medium drums, the quantification of retention phenomena in dense medium cyclones and indicating the importance of equally distribution of flows. Additionally, the results of the density tracer tests down to 2 mm are given which is valuable being one of the very few studies ever conducted at such fine sizes.
The possibilities of the production of high quality potassium feldspar in ceramics and porcelain ... more The possibilities of the production of high quality potassium feldspar in ceramics and porcelain industry from Kirşehir district (Balişeyh, Ağaçören, Başköy) were investigated. The results showed that it is possible to produce a first quality K-feldspar containing %10,4-11,5 K20, %2,1-2,8 Na20, %0,6-1,3 CaO, %0,01-0,2 MgO, %0,18-0,24 Fe203 and %0,01-0,03 Ti02 from coarse fractions which were wet screened and ground to -0,6 mm by dry magnetic separation. Moreover, high quality K-feldspar containing %13,01 K20, %2,28 Na20, %0,61 CaO, %0,01 MgO, % 0,16 Fe203 ve %0,002 Ti0 2 was also produced from the samples taken from Balişeyh, Beyobasi district by flotation. The undersize fraction (-5,6 mm) which is not suitable for production of high quality potassium feldspar can be used as plaster sand and slime fraction (-75 urn) may be used as raw material in brick and tile production.
Mineral Processing and Extractive Metallurgy, 2005
He obtained his MSc in 1990 and PhD in 1995 from the same department. He is currently Associate P... more He obtained his MSc in 1990 and PhD in 1995 from the same department. He is currently Associate Professor in the mineral processing division of the department.
Mineral Processing and Extractive Metallurgy Review, 2010
ABSTRACT In this study a sampling survey was carried out in JSC Madneuli copper flotation plant t... more ABSTRACT In this study a sampling survey was carried out in JSC Madneuli copper flotation plant to improve metallurgy by using process mineralogy. Size-by-size mineralogical analyses were performed for some critical streams around rougher, scavenger and cleaner banks by optic image analyzer system. With quantitative data, it was possible to indicate the reasons of dilution in the final copper concentrate and copper loss in the tail. It was found that 18.2% of total copper was lost from tail particularly from finest size as chalcocite. Also, batch flotation tests of some critical streams were performed during and after the sampling survey to evaluate the efficiency of the operating conditions in the plant. These tests showed that increasing the residence time and adding extra collector will result in an increase up to 20% of copper recovery improvement in scavenger bank while it will be 95% in cleaner bank without any decrease in grade. Based on the mineralogical results, regrinding was proposed for particularly cleaner tail as it consisted of mostly coarse and locked particles.
Water shortages have a direct impact on the life of many mining and mineral processing operations... more Water shortages have a direct impact on the life of many mining and mineral processing operations. Therefore, a good understanding of the effects of water quality on flotation performance is essential. In this study, effects of dissolved ions (both anions and cations) were investigated on the flotation performance of a Cu-Zn complex sulfide ore from Çayeli Bakır İşletmeleri A.Ş. (CBI)
This paper describes a study of the relationship between the physical, chemical and mineralogical... more This paper describes a study of the relationship between the physical, chemical and mineralogical parameters of cement products obtained by different grinding mechanisms namely high pressure grinding rolls (HPGR) and ball milling, and their effects upon the properties of cements prepared from the ground clinker. Samples were prepared as narrow size fractions and also as distribution samples. Characterization parameters were ascertained by using XRF, laser sizing, Blaine and BET surface area and image analysis methods. HPGR grinding resulted in higher degrees of liberation of clinker phases arising from the intergranular breakage along the grain boundaries compared to ball mill grinding. As for service properties, water demand of HPGR products was higher than ball mill products resulting from high micro fissured structure. Despite high liberation of particularly alite mineral in HPGR grinding, the compressive strength of ball mill products was slightly higher than HPGR products for narrow size samples. Finally, particle size distribution effect on strength was more obvious for distribution samples; generally ball milling gave higher strength values.
Different milling conditions, such as wet or dry, and use of different grinding media have a grea... more Different milling conditions, such as wet or dry, and use of different grinding media have a great impact on the flotation performance of sulphide minerals. In the present study, the effects of wet and dry grinding and the use of different grinding media, such as mild steel (MS) and stainless steel (SS), were investigated on a Cu-sulphide ore. The samples were ground as dry and wet with both grinding media, to a P80 value of −75 µm, and then flotation was carried out under the same conditions. The obtained data from flotation were evaluated in terms of solid/water recovery, chalcopyrite/pyrite recovery and separation efficiency. The effects of different milling conditions were discussed with the measured chemical parameters such as redox potential and dissolved oxygen level together with the flotation rate of chalcopyrite. The redox potential of the dry ground ore, irrespective of the type of milling media, was measured considerably higher than the wet grinding conditions. With SS m...
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