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1
Content available Dissolution kinetics of smithsonite in boric acid solutions
Abali Y., Bayca S. U., Gumus R.
Physicochemical Problems of Mineral Processing
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2017
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Vol. 53, iss. 1
161--172
EN
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.
2
Content available Optimization of pure borax pentahydrate extraction from calcined tincal
Abali Y., Bayca S. U., Edgunlu G.
Physicochemical Problems of Mineral Processing
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2015
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Vol. 51, iss. 2
375--385
EN
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 °C, solid-to-liquid ratio 10 g/dm3, stirring speed 250 rpm and dissolution time 5 min.
3
Content available Removal of methylene blue by natural and Ca and K-exchanged zeolite treated with hydrogen peroxide
Canli M., Abali Y., Bayca S. U.
Physicochemical Problems of Mineral Processing
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2013
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Vol. 49, iss. 2
481--496
EN
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 (R2 values between 0.959 and 0.996) fitted the experimental data better than the Freundlich model (R2 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.
4
Content available remote Optimization of dolomite ore leaching in hydrochloric acid solutions
Abali Y., Bayca S. U., Arisoy K., Vaizogullar A. I.
Physicochemical Problems of Mineral Processing
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2011
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Vol. 46
253-262
EN
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°C, solid-to-liquid ratio 2%, acid concentration 20 g/cm3 (2 mol/dm3), stirring speed 450 rpm, leaching time 5 min. Under the optimum process conditions, the dolomite ore leaching efficiency was about 83%.
PL
Wykorzystano metodę Taguchi do określenia optymalnych warunków ługowania rudy dolomitowej w roztworach kwasu solnego. Badano takie parametry jak temperatura, stosunek fazy stałej do ciekłej, początkowe stężenie kwasu, czas ługowania i prędkość mieszania. Ustalono, że optymalnymi parametrami są: stosunek fazy stałej do ciekłej 2%, początkowe stężenie kwasu 20 g/cm3 (2 mol/dm3), prędkość mieszania 450 rpm, czas ługowania 5 min. W tych warunkach wyługowanie dolomitu było około 83%.
5
Content available remote Leaching kinetics of ulexite in oxalic acid
Abali Y., Bayca S. U., Mistincik E.
Physicochemical Problems of Mineral Processing
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2011
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Vol. 47
139-148
EN
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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