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    Adsorption of Crystal Violet on Activated Carbon Prepared from Coal Flotation Concentrate
    (Iop Publishing Ltd, 2016) Aydogmus, Ramazan; Depci, Tolga; Sarikaya, Musa; Kul, Ali Riza; Onal, Yunus
    The objective of this study is firstly to investigate the floatability properties of Zilan-Van coal after microwave irradiation and secondly to produce activated carbon from flotation concentrate in order to remove Crystal Violet (CV) from waste water. The flotation experiments showed that microwave heating at 0.9 kW power level for 60 sec exposure time enhanced the hydrophobicity and increased the flotation yield. The activated carbon with remarkable surface area (696 m(2)/g) was produced from the flotation concentrate and used to adsorb CV from aqueous solution in a batch reactor at different temperature. The adsorption properties of CV onto the activated carbon are discussed in terms of the adsorption isotherms (Langmuir and Freundlich) and found that the experimental results best fitted by the Langmuir model.
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    Aluminum Recovery by Acid Leaching of Variously Enriched Pyrophyllite Ore: Effects of Pre-treatment Methods for Activation
    (Springer Heidelberg, 2023) Aydogmus, Ramazan; Erdemoglu, Murat; Uysal, Turan
    Effects of pre-treatment methods such as calcination for thermal activation and intensive milling for mechanical activation on the aluminum (Al) recovery by acid leaching of preliminarily enriched pyrophyllite ore via attrition scrubbing and froth flotation were investigated. XRD patterns of the calcined and the intensively milled samples were compared to determine the changes during the pre-treatment processes. Hot HCl solution was used for dissolution of aluminum to determine the Al recoveries from variously enriched and variously pre-treated pyrophyllite ore samples. Specific thermal and milling energies consumed per unit amount of ore were calculated, and the ideal activation method was suggested by comparing the activation methods in terms of energy consumption. Mechanical activation of the pyrophyllite concentrate obtained by attrition scrubbing rather than froth flotation was suggested for higher recoveries of aluminum from by acidic leaching. It was determined that operating cost (in terms of energy) of the mechanical activation is lower and aluminum recovery is higher than thermal activation. It was concluded that mechanical activation instead of thermal activation is more economical and environmentally friendly method.
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    Beneficiation of Complex Zinc-Lead Ores from Görgü (Malatya, Turkey) Region by Selective Flotation
    (Springer Heidelberg, 2024) Sis, Hikmet; Kiyak, Tufan; Erdemoglu, Murat; Demirkiran, Nizamettin; Aydogmus, Ramazan
    The growing demand for zinc and lead metals necessitated beneficiation of complex and oxidized zinc-lead ores, the ore types which are considered as difficult-to-float with conventional flotation. This study aimed to investigate flotation behavior of complex zinc-lead ores from G & ouml;rg & uuml; (Malatya) region that contains 2.92% Pb and 11.86% Zn. The characterization of flotation fractions by XRD, XRF, ICP, and elemental analysis provided valuable data for interpretation of the results. Studies revealed the effectiveness of various types and dosages of reagents in the flotation. It was found that high dosages of collector (e.g., 500 g/t KAX), sulfidizing agent (e.g., 5000 g/t Na2S.9H2O), and depressing/dispersing agents (e.g., 4000-5000 g/t Na2SiO3 and 2000-3000 g/t Na2CO3) was required to separate lead minerals effectively. In a single rougher flotation, a lead concentrate of 38.50% Pb grade could be obtained with 70.57% recovery. Nevertheless, zinc flotation results were not satisfactory as the zinc recovery and grade, respectively, could not exceed 17.70% and 17.01%.
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    Influence of Microwave Heating and Thermal Auxiliary on Decomposition of Siderite
    (Iop Publishing Ltd, 2016) Celikdemir, Mehmet; Sarikaya, Musa; Depci, Tolga; Aydogmus, Ramazan
    In the present study, microwave radiation was used to decrease power inputs and roasting duration time for thermal decomposition of Deveci, Hekimhan siderite ore. The siderite was not enough to absorb adequate microwave radiation to start the decomposition or roasting reaction. Therefore, sucrose as a thermal auxiliary was added to the raw siderite ore before microwave irradiation. The effect of amount of sucrose (10 to 30 % by weight) against the duration of heating and roasting temperature of the thermal decomposition of siderite was investigated in the present study. On the contrary of the literature, the experimental results showed that the siderite was decomposed in 3 minutes with addition of 30 wt % sucrose and transformed to Fe3O4. The temperature, the weight loss and the magnetic susceptibility of the roasted final product were recorded as 1100 degrees C, 32.14 wt.% and 15410.03*10(-8) m(3)/kg., respectively.
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    Production of Nano Amorphous SiO2 from Malatya Pyrophyllite
    (Iop Publishing Ltd, 2016) Sarikaya, Musa; Depci, Tolga; Aydogmus, Ramazan; Yucel, Aysegul; Kizilkaya, Nilgun
    Pyrophyllite (Al4Si8O20(OH)(4)) is an important industrial clay mineral. In this paper, highly pure nano silica powder was synthesized by alkaline treatment method from the local pyrophyllite deposit which is in Malatya, Turkey. The morphologies, structures and properties of the raw pyrophyllite and the obtained nano amorphous SiO2 were determined by XRF, XRD, ATR, SEM and EDX. The results showed that the nano silica can be produced with a high purity (98%) and nano size (< 50 nm).
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    Recovery of Zinc from Flotation Tailings of Lead-Zinc Ore Through a Hydrometallurgical Route
    (Springer, 2025) Sis, Hikmet; Kiyak, Tufan; Erdemoglu, Murat; Demirkiran, Nizamettin; Aydogmus, Ramazan
    This study focuses on recovering zinc from flotation tailings through a hydrometallurgical route, including sequential H2SO4 leaching, iron precipitation, and solvent extraction (SX) processes. The effect of leachate concentration, leaching temperature, and time on the zinc recovery was investigated at constant solid/liquid ratio and stirring rate. In order to remove impurities from the pregnant leach solution (PLS), dissolved iron was first precipitated with NaOH solution, and then the dissolved zinc ions were extracted selectively by D2EHPA. Finally, the zinc in the organic D2EHPA phase was stripped into an aqueous phase by utilizing H2SO4 solution to obtain a concentrated and purified zinc solution. It was seen that 93.50% of zinc in the tailings could be leached under optimum leaching conditions. In the SX process, the organic phases, prepared at organic/aqueous ratio (O/A) of 1/1 by volume, could extract 95.3% of the zinc in the pregnant leach solution within 10 min of extraction time. The stripping of 96.83% zinc into the aqueous phase was possible by using a 0.5-M H2SO4 solution, prepared at an O/A ratio of 1/1 by volume. Calculations showed that an 82.65% of cumulative zinc recovery could be achieved through the proposed leaching and SX route.