Yüksel Abali

Dissolution kinetics of magnesite mineral in water saturated by chlorine gas

Abstract In this study, the dissolution kinetics of magnesite mineral with Cl 2 gas in aqueous media were investigated. The effects of reaction temperature, particle size, solid-to-liquid ratio, gas flow rate and stirring speed on the dissolution process were determined. It was observed that the dissolution of the magnesite mineral increased with increasing reaction temperature, gas flow rate and stirring speed and with decreasing particle size and solid-to-liquid ratio. By analysis of the experimental data using heterogeneous kinetic models, it was determined that the dissolution process is controlled by resistance of the chemical surface reaction for range 12°–40°C and film diffusion for range 40°–70°C.

The optimisation of the dissolution of phosphate rock with Cl2SO2 gas mixtures in aqueous medium

Abstract In the present study, aimed at the production of phosphate compounds, the optimum process conditions were sought for the dissolution of phosphate rock from the Mardin-Mazidaǧi concentrate. The dissolution of this phosphate rock in aqueous solution saturated with a mixture of Cl2SO2 gases was optimized by passing Cl2 gas through the final solution. Reaction temperature, solid-liquid ratio, Cl2 gas flow rate, reaction period and stirring speed were employed as parameters. Using the Taguchi Fractional Design Method, it was found that the optimum process conditions, at which 93.35% P2O5 conversion was reached, were as follows: Reaction temperature: 20°C Solid-liquid ratio: 1 7 (w/v) Cl2 gas flow rate: 120 cm3 min−1 Reaction period:20 min Stirring speed: 600 min−1

Dissolution kinetics of phosphate rock with Cl2 gas in water

Abstract In this study the dissolution kinetics of phosphate rock with C12 gas in aqueous media were investigated. The effect of particle size, solid-to-liquid ratio, gas flow rate, reaction temperature and stirring speed on the dissolution process were determined. It was observed that the dissolution of the phosphate rock increased with increasing gas flow rate and stirring speed and with decreasing particle size and solid-to-liquid ratio. Increasing reaction temperature increased the dissolution slightly between 12°C and 30°C and decreased it between 40°C and 80°C. By analysis of the experimental data using heterogeneous kinetic models it was determined that the dissolution process is controlled by diffusion through the fluid layer.

Analyses of boronic ores and sludges and solubilities of boron minerals in CO2-saturated water

Abstract In this study, the potential of boron in Turkey, commercial most-used compounds of boron and their production trends according to years and analyses of boronic samples obtained different sources were investigated. Besides classic analysis technics, X-ray fluorescence spectrometric (XRF) and flame photometric methods were carried out for boronic samples. Chemical compositions of original and concentrated samples were studied with respect to the contents of B, Li, Ca, Al, Fe, Mg, S, As, Si, Sr and Na. The leaching of boric acid with CO 2 -saturated water from boron minerals was also investigated.

Recovery of phosphate from calcinated bone by dissolution in hydrochloric acid solutions

Abstract In this study, the optimum conditions of dissolution of calcinated bone in HCl solutions with different concentrations are investigated. Recovery of phosphate from calcinated bone by dissolution with hydrochloric acid solutions was investigated in a batch reactor, it was observed that a 32% hydrochloric acid solution can dissolve the calcinated bone effectively. Using the Taguchi fractional design method, it was found that the optimum process conditions, at which 67.2% P 2 O 5 dissolution was reached, were as follows: Reaction temperature: 318 K, solid-to-liquid ratio: 1/5 (g ml −1 ), acid concentrations:32 (% w/v), stirring speed:400 min −1 and reaction time: 60 min.

The Dissolution Kinetics of Tincal in Phosphoric Acid Solutions

In this study, the dissolution kinetics of tincal in phosphoric acid solutions was investigated. The effects of reaction temperature, acid concentration, solid to liquid ratio, particle size and stirring speed were determined in the experiments. The results showed that the dissolution rate increased with increasing acid concentration, reaction temperature, stirring speed and increased with decreasing particle size and solid to liquid ratio. The dissolution rate was found to be based on the first order pseudo homogenous reaction model. The activation energy of the tincal in phosphoric acid solution was determined as 42.28 kJ.mol-1.

Investigation of Leaching Kinetics of Ulexite Waste in Oxalic Acid Solutions

The dissolution of ulexite waste in oxalic acid solutions was studied in a batch reactor after characterization of the waste by X-ray diffraction (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 .

Sulu Ortamda SO2 Gazı İle Fosfat Kayasındaki Kalsitin Çözünme Kinetiği

Yap lan bu cal mada fosfat kayas nda bulunan karbonatl minerallerin sulu ortamda SO2 gaz ile cozunme kineti i incelenmi tir.Cozundurme i lemlerinde reaksiyon s caklve kar t rma h z parametre olarak secilmi tir. Reaksiyon s cakl oran ve tanecik boyutunun kuculmesi ile cozunme oran artm t r. Cozunme reaksiyonunun homojen 1. mertebe oldu u ve aktivasyon enerjisinin 21,70 kJ.mol-1 oldu u tespit edilmi tir