Browsing by Author "Bayca, SU"

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    The influence of coal bottom ash and tincal (boron mineral) additions on the physical and microstructures of ceramic bodies
    Bayca, SU; Batar, T; Sayin, E; Solak, O; Kahraman, B
    In this paper, the influence of coal bottom ash and tincal additions on the physical properties and microstructures of the standard wall tile body composition was investigated. Water absorption, fang strength, dry and fired shrinkage tests of the incorporated ceramic bodies and reference body were done. Microstructures of sintered tiles were analyzed using a scanning electron microscope (SEM). The results show that tincal additions to the ceramic body improved the physical properties of the tiles. As a result, tincal can be used as a flux material in the ceramic bodies due to its favorable effects on the water absorption and fired strength. The results revealed that bottom ash can be used in the ceramic tile body composition. When bottom ash was used in the ceramic industry, environmental hazards of bottom ash are inhibited. Furthermore, bottom ash is transformed to an economic product.
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    OPTIMIZATION OF DOLOMITE ORE LEACHING IN HYDROCHLORIC ACID SOLUTIONS
    Abali, Y; Bayca, SU; Arisoy, K; Vaizogullar, AI
    In this study, the Taguchi method was used to determine the optimum conditions for leaching of dolomite ore in hydrochloric acid solutions. The experimental parameters were leaching temperature, solid-to-liquid ratio, acid initial concentration, leaching time and stirring speed. The following optimum leaching parameter levels were found: temperature 50 degrees C, solid-to-liquid ratio 2%, acid concentration 20 g/cm(3) (2 mol/dm(3)), stirring speed 450 rpm, leaching time 5 min. Under the optimum process conditions, the dolomite ore leaching efficiency was about 83%.
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    Investigation of Leaching Kinetics of Ulexite Waste in Oxalic Acid Solutions
    Bayca, SU; Kocan, F; Abali, Y
    The dissolution of ulexite waste in oxalic acid solutions was studied in a batch reactor after characterization of the waste by X-ray diffiaction (XRD) analysis and X-ray fluorescence (XRF) analysis. The dissolution parameters in this study were acid concentration, stirring rate, and reaction temperature. The experimental data were examined using homogeneous and heterogeneous kinetic models, and the dissolution kinetics of the waste was determined to be a first-order reaction control model. The activation energy of ulexite waste in oxalic acid solution was also calculated. It was observed that the dissolution rate increased with increasing reaction temperature, stirring rate and acid concentration. The kinetic model of the dissolution process was determined to be a first-order reaction control model. The activation energy was found to be 41.09 kJ mol(-1).
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    Optimization of Leaching Parameters of Aluminum Hydroxide Extraction from Bauxite Waste Using the Taguchi Method
    Bayca, SU; Kisik, H
    In this study, the statistical optimization of the leaching parameters of aluminum hydroxide extraction from bauxite waste (red mud) was investigated. The extraction parameters were solid-to-liquid ratio, base concentration, reaction temperature, leaching time, and stirring speed. Optimum experimental conditions were carried out by the Taguchi method. A higher dissolution rate was found to give better performance characteristics. The most important parameter was determined using the statistical analysis of variance. (c) 2017 American Institute of Chemical Engineers
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    REMOVAL OF METHYLENE BLUE BY NATURAL AND Ca AND K-EXCHANGED ZEOLITE TREATED WITH HYDROGEN PEROXIDE
    Canli, M; Abali, Y; Bayca, SU
    A comparison was made of influence of physically adsorbed methylene blue (MB) dye on the physicochemical properties of Manisa-Akdere zeolite (natural zeolite) and zeolite modified with K and Ca (all samples treated with hydrogen peroxide before modification) using batch adsorption technique. After elementary characterization of this adsorbent, the effects were investigated of initial MB concentration, pH, contact time, stirring rate, adsorbent dosage and temperature on the selectivity and sensitivity of the removal process. A larger adsorption of the dye was observed for modified zeolite (42.7 mg/g) than for natural zeolite (28.6 mg/g) per gram of an adsorbent after all zeolite samples treated with hydrogen peroxide. Zeolite treated with H2O2 showed higher adsorption capacity than untreated zeolite samples. The Langmuir model (R-2 values between 0.959 and 0.996) fitted the experimental data better than the Freundlich model (R-2 values between 0.804 and 0.988). The adsorption process was found to be slightly influenced by adsorbent dosage, contact time and temperature. Optimum pH for adsorption of MB was found to be at 7. Adsorption equilibrium attained within 30 minutes. The sorption of MB increased slightly with rising temperature. In addition, adsorption values rose with modification Ca-Exchanged (after H2O2 treatment) > K-Exchanged (after H2O2 treatment) > Zeolite treated with H2O2 > Ca-Exchanged >K-Exchanged >Natural Zeolite.
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    DISSOLUTION KINETICS OF SMITHSONITE IN BORIC ACID SOLUTIONS
    Abali, Y; Bayca, SU; Gumus, R
    The dissolution of smithsonite in boric acid solutions was investigated. The influence of the reaction temperature, acid concentration, solid-to-liquid ratio, particle size and stirring speed on the zinc extraction were determined in the experiments. The results show that the dissolution rate increases with increasing acid concentration and reaction temperature, and with decreasing particle size and solid-to-liquid ratio. The dissolution results were analyzed by reaction control models. The activation energy of smithsonite in boric acid solution was also calculated.
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    Leaching kinetics of ulexite in oxalic acid
    Abali, Y; Bayca, SU; Mistincik, E
    Leaching of ulexite in oxalic acid, which is an organic acid, was studied. The parameters were solid-to-liquid ratio, acid concentration, stirring speed and temperature. The experimental data were applied to the homogeneous and heterogeneous kinetic models to determine the best one. The results showed that the leaching rate increases with increasing reaction temperature, stirring speed, acid concentration, but decreases with solid-to-liquid ratio and particle size. The leaching kinetics of ulexite was determined as the product layer model. The activation energy of the process was calculated.
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    Kinetics of oxalic acid leaching of tincal
    Abali, Y; Bayca, SU; Mistincik, E
    The leaching kinetics of tincal in oxalic acid solutions was investigated in this study. The effects of parameters reaction temperature, acid concentration, solid to liquid ratio, particle size and stirring speed on tincal leaching were determined in the experiments. It is observed that the leaching rate increases with increasing reaction temperature, stirring speed and decreasing solid to liquid ratio and particle size. The experimental data tested the reaction control models and the best model for the leaching rates of tincal was the product layer model. The activation energy of the process was calculated as 35.14 kJ mol(-1). (c) 2006 Elsevier B.V. All rights reserved.
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    Effects of the addition of ulexite to the sintering behavior of a ceramic body
    Bayca, SU
    The aim of this study was to investigate the effects of the addition of ulexite to the sintering behavior of a ceramic body. Ulexite is a boron mineral that is known as sodium calcium borate. The effects of ulexite, as a powerful flux, on the properties such as the water absorption, bending strength, and shrinkage and on the colors of ceramic tiles were studied. The microstructures of a standard and tiles with the additive were analyzed using a scanning electron microscope (SEM). The properties of with ulexite added tiles were compared with that of standard tiles and it was concluded that tiles having the additive had more favorable physical properties than the standard ones. Adding ulexite decreased the sintering temperature of the tiles, which in turn led to an increase in the bending strength of the tiles, a decrease in water absorption, and an increase in shrinkage. The SEM analyses have shown that ulexite additions increased the vitrification in the body.
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    Microwave radiation leaching of colemanite in sulfuric acid solutions
    Bayca, SU
    Two leaching methods were used to study colemanite leaching reactions. First, the conventional acid leaching method was performed using a glass reactor at atmospheric pressure, leaching in a water bath. Second, microwave acid leaching was carried out using the glass reactor in a modified microwave oven. The characterization of ground colemanite was determined by X-ray diffraction (XRD) analysis, X-ray Fluorescence (XRF) analysis and chemical analysis. An investigation was made of the influence of the solid/liquid ratio, stirring speed, acid concentration, microwave power, reaction time and reaction temperature on the leaching recovery of boron oxide. The results of the conventional acid leaching (CVAL) method were compared to the microwave leaching (MWAL) method. The crystallization of gypsum was investigated with regard to obtaining high-purity boric acid at different acid concentrations using microwave leaching, in which all of the calcium ions in the liquid phase were incorporated into the gypsum crystals. The optimum leaching efficiency for the CVAL and MVAL methods was 99.82% and 99.9% respectively. (c) 2012 Elsevier B.V. All rights reserved.
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    Dissolution of Colemanite Process Waste in Oxalic Acid Solutions
    Bayca, SU; Kocan, F; Abali, Y
    The dissolution of colemanite waste in oxalic acid solutions was studied in a batch reactor, and the characterization of colemanite waste was determined by X-ray diffraction analysis and X-ray Fluorescence analysis. The dissolution parameters in this study were acid concentration, stirring speed, and reaction temperature, and it was observed that the dissolution rate increased with increasing reaction temperature. The experimental data were examined by using homogeneous and heterogeneous kinetic models, and the dissolution kinetics of the waste was determined to be a pseudo-first-order homogeneous reaction control model. The activation energy of colemanite waste in oxalic acid solution was calculated to be 27.80 kJ/mol. Thus, pure boric acid crystals can be produced using of colemanite waste, and this can benefit the environment and the economy. (c) 2013 American Institute of Chemical Engineers Environ Prog, 33: 1111-1116, 2014
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    Evaluation of blends tincal waste, volcanic tuff, bentonite and fly ash for use as a cement admixture
    Abali, Y; Bayca, SU; Targan, S
    The evaluation of blends tincal waste (TW), fly ash (FA), bentonite (BE), volcanic tuff (VT) for use as a cement admixture was investigated. The properties examined include setting time, expansion, water requirement, specific surface and compressive strength of cement mixtures. The results revealed that the early compressive strength decrease with increasing tincal waste, due to tincal waste increasing initial setting time of the cement. The tincal waste and volcanic tuff of cement mixtures increased and there was reduction in compressive strength. The more the tincal waste increased the greater retardation there was initial setting time this may be attributed to containing high amount B2O3 and MgO content. The tincal waste and fly ash increased with expansion increased. Water requirement increased as the Blaine fineness of the cement mixtures increased. The results obtained were compared with standards and five batches were advised as suitable for the standard. (c) 2005 Published by Elsevier B.V.
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    OPTIMIZATION OF PURE BORAX PENTAHYDRATE EXTRACTION FROM CALCINED TINCAL
    Abali, Y; Bayca, SU; Edgunlu, G
    In this study, conditions for the calcination process of tincal were investigated and the optimum calcination conditions for boron extraction from tincal were determined. The experimental parameters were dissolution temperature, solid-to-liquid ratio, dissolution time and stirring speed. The optimum dissolution parameter levels were determined to be temperature 80 degrees C, solid-to-liquid ratio 10 g/dm(3), stirring speed 250 rpm and dissolution time 5 min.