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Elif Yilmaz
Hydromet B&PM Research Group, Division of Mineral & Coal Processing, Department of Mining Engineering, Karadeniz Technical University, Ortahisar, Trabzon 61080, Turkey

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Journal article
Published: 01 June 2020 in Minerals
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Under the oxidative roasting process, pyrite, as a major mineral in sulfidic mine tailings, can transform to iron oxides. Generated iron oxides, if exhibiting enough magnetic properties, can be recovered via magnetic separation resulting in partial mine tailings valorization. However, due to the presence of various minerals and sintering possibility, it is advantageous to remove impurities and increase the pyrite content of mine tailings prior to the roasting procedure. In this case, hydrofluoric acid that has no influence on pyrite can be used to leach most inorganic minerals, including aluminosilicates. Therefore, this study investigated and compared the influence of the roasting process with and without hydrofluoric acid leaching pretreatment on mineralogical phase transformation of pyrite and magnetic properties of thermally generated minerals. Several tests and analyses were performed to study mineralogical phase transformation, morphology, elemental composition, surface characterization, and magnetic properties. Results of this study indicated that without acid leaching pretreatment, pyrite was mainly transformed to hematite. However, via acid leaching, fluorine, as a more electronegative element over oxygen, entered the compound and neglected the role of oxygen in thermal oxidation, instead reducing sulfur content of pyrite to only form pyrrhotite.

ACS Style

Babak Koohestani; Ahmad Khodadadi Darban; Pozhhan Mokhtari; Esmaeel Darezereshki; Erol Yilmaz; Elif Yilmaz. Influence of Hydrofluoric Acid Leaching and Roasting on Mineralogical Phase Transformation of Pyrite in Sulfidic Mine Tailings. Minerals 2020, 10, 513 .

AMA Style

Babak Koohestani, Ahmad Khodadadi Darban, Pozhhan Mokhtari, Esmaeel Darezereshki, Erol Yilmaz, Elif Yilmaz. Influence of Hydrofluoric Acid Leaching and Roasting on Mineralogical Phase Transformation of Pyrite in Sulfidic Mine Tailings. Minerals. 2020; 10 (6):513.

Chicago/Turabian Style

Babak Koohestani; Ahmad Khodadadi Darban; Pozhhan Mokhtari; Esmaeel Darezereshki; Erol Yilmaz; Elif Yilmaz. 2020. "Influence of Hydrofluoric Acid Leaching and Roasting on Mineralogical Phase Transformation of Pyrite in Sulfidic Mine Tailings." Minerals 10, no. 6: 513.

Journal article
Published: 13 April 2019 in Construction and Building Materials
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To understand the quality and behavior of cemented tailings backfill (CTB) subjected to dynamic loads, the influence of change in the rate of loading should be accurately determined for an efficient mine fill design. In this study, the compressive strength behavior and acoustic emission (AE) characteristics of 180-day cured CTB samples are investigated by using four different loading rates: 50 N/s, 100 N/s, 150 N/s, and 200 N/s. Samples were prepared with the classified tailings and cementitious material of a gold mine as raw materials and subjected to the uniaxial compressive test using mechanical testing machine (GAW-2000) and AE equipment (PCI-2). Experimental results indicate that: (1) the loading rate has a strengthening effect on long-term strength behavior of CTB samples, and there is a power function between peak compressive strength of CTB samples and loading rate. The stress state of the backfill mass is “stepped” growth before the peak compressive strength, and the whole process displays a multi-cycle of “surge-steady-surge-steady”; (2) during the loading process, the ring count distribution has a regular peak-spacing effect, and the cumulative ring counts are also “stepped” and inclined to be stable. (3) With the increase of loading rate, the failure mode of CTB is a transition from tensile and shear mixing (mainly shear stress) to X-type shear failure. Ultimately, the essential findings of this experimental work will provide a scientific reference for studying the dynamic characteristics of CTB samples.

ACS Style

Shuai Cao; Erol Yilmaz; Weidong Song; Elif Yilmaz; Gaili Xue. Loading rate effect on uniaxial compressive strength behavior and acoustic emission properties of cemented tailings backfill. Construction and Building Materials 2019, 213, 313 -324.

AMA Style

Shuai Cao, Erol Yilmaz, Weidong Song, Elif Yilmaz, Gaili Xue. Loading rate effect on uniaxial compressive strength behavior and acoustic emission properties of cemented tailings backfill. Construction and Building Materials. 2019; 213 ():313-324.

Chicago/Turabian Style

Shuai Cao; Erol Yilmaz; Weidong Song; Elif Yilmaz; Gaili Xue. 2019. "Loading rate effect on uniaxial compressive strength behavior and acoustic emission properties of cemented tailings backfill." Construction and Building Materials 213, no. : 313-324.

Journal article
Published: 12 April 2019 in Construction and Building Materials
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Fibers are accountable for an increase of compressive and shear strengths, particularly at the post-peak and post-cracking stages. The level of the strength improvement is primarily based on several factors: fiber type and content; fiber geometry, fiber distribution within the matrix; and the fiber-matrix interaction. An experimental campaign consisting of uniaxial compression and scanning electron microscopy tests were carried out to realize the effect of fiber reinforcement on mechanical behavior and microstructural properties of cemented tailings backfill (CTB) prepared with different fiber types (e.g., polypropylene, polyacrylonitrile and glass fibers) and contents (0%-control sample, 0.3, 0.6%, and 0.9%). Experimental results exhibit that polypropylene fiber exhibited the strongest reinforcing effect, followed by polyacrylonitrile and glass fiber. The rate of strength increase of the three fiber-reinforced fills after curing of 28 days reached 39.6%, 34.8% and 23.1%, respectively. A fiber content of 0.6% in the mixture is considered as a critical point, and the compressive strength of fiber-reinforced CTB samples first increases and then decreases, the peak strain and the post-peak ductility properties are positively correlated with fiber content. The failure process of fiber-reinforced CTB samples is mainly divided into four stages: pore compaction, linear elasticity, strain softening and crack propagation. It has the feature of ‘cracking without breaking’. Besides, fiber-reinforced CTB samples have a dense microstructure and good adhesion, improved interface between the fiber and the CTB matrix, and suppressed crack propagation. Lastly, an empirical equation was developed to forecast the peak strength and elastic modulus of CTB samples with different curing times.

ACS Style

Gaili Xue; Erol Yilmaz; Weidong Song; Elif Yilmaz. Influence of fiber reinforcement on mechanical behavior and microstructural properties of cemented tailings backfill. Construction and Building Materials 2019, 213, 275 -285.

AMA Style

Gaili Xue, Erol Yilmaz, Weidong Song, Elif Yilmaz. Influence of fiber reinforcement on mechanical behavior and microstructural properties of cemented tailings backfill. Construction and Building Materials. 2019; 213 ():275-285.

Chicago/Turabian Style

Gaili Xue; Erol Yilmaz; Weidong Song; Elif Yilmaz. 2019. "Influence of fiber reinforcement on mechanical behavior and microstructural properties of cemented tailings backfill." Construction and Building Materials 213, no. : 275-285.

Journal article
Published: 26 June 2018 in Mugla Journal of Science and Technology
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ACS Style

Erol Yilmaz; Elif Yilmaz; Elif Yılmaz. SUSTAINABILITY AND TAILINGS MANAGEMENT IN THE MINING INDUSTRY: PASTE TECHNOLOGY. Mugla Journal of Science and Technology 2018, 4, 16 -26.

AMA Style

Erol Yilmaz, Elif Yilmaz, Elif Yılmaz. SUSTAINABILITY AND TAILINGS MANAGEMENT IN THE MINING INDUSTRY: PASTE TECHNOLOGY. Mugla Journal of Science and Technology. 2018; 4 (1):16-26.

Chicago/Turabian Style

Erol Yilmaz; Elif Yilmaz; Elif Yılmaz. 2018. "SUSTAINABILITY AND TAILINGS MANAGEMENT IN THE MINING INDUSTRY: PASTE TECHNOLOGY." Mugla Journal of Science and Technology 4, no. 1: 16-26.

Journal article
Published: 01 December 2017 in Hydrometallurgy
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ACS Style

E.Y. Yazici; E. Yilmaz; F. Ahlatci; O. Celep; H. Deveci. Recovery of silver from cyanide leach solutions by precipitation using Trimercapto- s -triazine (TMT). Hydrometallurgy 2017, 174, 175 -183.

AMA Style

E.Y. Yazici, E. Yilmaz, F. Ahlatci, O. Celep, H. Deveci. Recovery of silver from cyanide leach solutions by precipitation using Trimercapto- s -triazine (TMT). Hydrometallurgy. 2017; 174 ():175-183.

Chicago/Turabian Style

E.Y. Yazici; E. Yilmaz; F. Ahlatci; O. Celep; H. Deveci. 2017. "Recovery of silver from cyanide leach solutions by precipitation using Trimercapto- s -triazine (TMT)." Hydrometallurgy 174, no. : 175-183.