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    Control of clay minerals effect in flotation. A review
    (E D P SCIENCES, 2016) Taner, Hasan Ali; Onen, Vildan
    The increased exposure to low grade ores highlights the importance of understanding phyllosilicate gangue mineralogy which consists of common gangue minerals. To improve the flotation performance and ore quality the negative effect of the clay minerals on flotation should be identified. The presence of clay minerals leads to problems, such as changing the froth stability, which are related to swelling behaviour, increase in pulp viscosity, overconsumption of reagents, slime coating and mechanical entrainment. The clay content in the ore is changing from time to time and it is necessary to provide quick solutions to the issues caused by the new ore composition. The objective of this paper is to give an overview how to control the colloidal properties of clay minerals on flotation.
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    The Relationship Between Mineral Content and Flocculant Characteristics for Slurry Waste Water Recycling at Marble Processing Plants
    (SPRINGER HEIDELBERG, 2016) Bayel, Diler Katircioglu; Karaca, Zeki; Onen, Vildan; Deliormanli, Ahmet Hamdi
    The requirements for clean water in marble processing are partially realized by treating and recycling slurry wastes from the cutting and processing plant. In this study, the flocculation of calcitic and dolomitic (21.2 % MgO) marble wastes was investigated using six flocculants with different molecular weights and anionic levels. Nine solutions between 0.1 and 2.5 mg/L were prepared, and marble waste samples were treated in natural, slightly acidic, and alkaline media. The anionic flocculants had a more dramatic effect on the slower-settling dolomitic marble than the calcitic marble. Calcite precipitation was better in an alkaline medium, while dolomitic marble precipitation was better at a slightly acidic pH of 6.
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    Removal of Turbidity from Travertine Processing Wastewaters by Coagulants, Flocculants and Natural Materials
    (SPRINGER HEIDELBERG, 2018) Onen, Vildan; Beyazyuz, Pinar; Yel, Esra
    The sedimentation behaviour of travertine-processing wastewater containing a high concentration of suspended solids was investigated using different coagulation and flocculation methods. In batch experiments, four types of coagulants [FeC1(3), Al-2(SO4)(3), PACl, NaAlO2], six types of flocculants (40% MMW-40% HMW cationic, 30% MMW, 40% MMW, 40% HMW anionic and nonionic) and three types of natural materials (NMs) (sepiolite, zeolite, and pumice) were used to treat wastewater with an initial turbidity of 570-880 NTU. The optimum process conditions (dosage, mixing time/speed, sedimentation time, and pH) were investigated for each. Sedimentation performance was assessed by the effluent turbidity (T (eff)) values of the treated water. The best performances obtained were 99.3% (T (eff) = 4 NTU), 99.1% (T (eff) = 8 NTU), and 97.8% (T (eff) = 18 NTU) with 40% HMW anionic-cationic flocculants, zeolite, and FeCl3, respectively. Sludge properties, including sludge settling velocity (mm/min), sludge density (g/cm(3)), suspended solids (SS) content (mg/L), and sludge solids (%) were determined and compared under optimized conditions. The type of additive significantly affected performance. Travertine processing wastewater flocculation with polymeric materials and NMs, especially zeolite, was more favourable than coagulants in terms of both turbidity removal and sludge quality. Since zeolite is a NM, additional studies on using and recycling of the generated sludge as an industrial feedstock would be worthwhile.