Van Yüzüncü Yıl Üniversitesi

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Dissolution Kinetics of Calcined Ulexite in Ammonium Chloride Solutions at High Solid-To Ratios
(Peking Univ Press, 2006) Gur, Aycan
The dissolution kinetics of calcined ulexite in ammonium chloride solutions at high solid-to-liquid ratios were investigated. In the experiments, calcination temperature, solution concentration, reaction temperature, and prehydration were chosen as parameters. It was observed that the dissolution rate increased with increasing calcination temperature, solution concentration, and reaction temperature, whereas it was not affected by pre-hydration. Employing graphical and statistic methods, the dissolution rate, based on homogeneous reaction model, can be given as: (1X(B2O3))(-1)-1= k(c(NH4Cl))(1.982)t. The activation energy for the dissolution of the ulexite sample calcined at 160 degrees C was found to be 84.04 kJ . mol(-1).
A Kinetic Study on Leaching of Colemanite in Ammonium Nitrate Solutions
(Chinese Chemical Soc, 2008) Gur, Aycan
The dissolution of colemanite in aqueous ammonium nitrate solutions was investigated in a batch reactor in terms of stirring speed, particle size, reaction temperature, solid-to-liquid ratio and solution concentration. The results showed that the dissolution rate increased with increasing temperature and concentration of ammonium nitrate solution as well as decreasing particle size and solid-to-liquid ratio, while no important effect of stirring speed was observed on dissolution rate. Colemanite could be dissolved up to 100 percent in aqueous ammonium nitrate solutions. The dissolution kinetics of colemanite was examined according to heterogeneous and homogeneous reaction models. The experimental data revealed high activation energy, indicating that the dissolution rate based on heterogeneous reaction models can be expressed as 1-(1-X)(1/3)=3.28x10(4).D-0.653 7.C-1.295 8.(S/L)(-0.490 9).e(-41.40)(RT).t. The activation energy of the process was found to be 41.40 kJ.mol(-1).
Leaching Kinetics of Tincal in Ammonium Chloride Solutions
(Chinese Chemical Soc, 2009) Gur, Aycan; Kandilcik, Meltem
The effects of reaction temperature, solution concentration, solid to liquid ratio, particle size and stirring speed were investigated on leaching kinetics of tincal, sodium tetraborate decahydrate(Na2B4O7 center dot 10H(2)O), in ammonium chloride solutions. The results showed that the dissolution rate increased with increasing solution concentration and reaction temperature, and increased with decreasing particle size and solid to liquid ratio. It was also determined that stirring speed had no significant effect on dissolution rate. The dissolution process was examined according to homogeneous and heterogeneous reaction kinetic Model. The dissolution rate was found to be based on the first order pseudo homogeneous reaction model. The activation energy of the dissolution of tincal in ammonium chloride solutions was determined to be 82.73 kJ . mol(-1).

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