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    A kinetic study on the conversion of celestite (SrSO4) to SrCO3 by mechanochemical processing
    (ELSEVIER SCIENCE BV, 2007) Erdemoglu, Murat; Aydogan, Salih; Canbazoglu, Mehmet
    The direct conversion of celestite (SrSO4) to Strontium carbonate by mechanochemical processing was studied under wet milling conditions by varying the amount of sodium carbonate with respect to the stoichiometric amount required for the conversion reaction. The effect of solid to liquid ratio and change of particle size distribution during the milling were examined. The resulting conversion-time curve was fitted using the shrinking particle model. It was observed that celestite completely converted to strontium carbonate within 45 min, when the solid to liquid ratio was 0.1. With 50% excess sodium carbonate was used at a solid to liquid ratio of 0.2 the apparent rate constant was 0.0131 min(-1), at a solid to liquid ratio of 0.1 the rate was 0.0211 min(-1). The order of mechanochemical conversion was proportional to the 1.21 power of the CO32- concentration. (C) 2006 Elsevier B.V. All rights reserved.
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    Reaction kinetics of molybdenum dissolution by hydrogen peroxide in acidic and alkaline solutions using tartaric acid and sodium hydroxide: A semi-empirical model with rotating disc method
    (Wiley, 2024) Motasim, Mahmoud; Agacayak, Tevfik; Eker, Yasin Ramazan; Aydogan, Salih; Abbaker, Ahmed
    Molybdenum is an amphoteric metal that dissolves in both acidic and alkaline solutions. This fundamental study explores a sustainable process for the dissolution of molybdenum, focusing on the reaction kinetics in H2O2, H2O2-NaOH, and H2O2-C4H6O6 solutions. A rotating disc method was applied with the Levich's equation. Semi-empirical models with activation energy were developed for the H2O2-NaOH and H2O2-C4H6O6 solutions. The study examined the effects of rotating speed, disc surface area, temperature, H2O2, NaOH, and C4H6O6 concentrations, along with rotating speed, disc surface area, and temperature. Hydrogen peroxide significantly impacted molybdenum dissolution rates across all three solutions. The reaction order of hydrogen peroxide concentration in the H2O2 solution was greater than that of the H2O2-NaOH and H2O2-C4H6O6 solutions. The complex of molybdenum peroxo was formed in H2O2 and H2O2-NaOH solutions but decomposed at a temperature >= 50 degrees C. The activation energies were determined to be 49.90, 43.60, and 41.10 kJ/mol for the H2O2, H2O2-NaOH, and H2O2-C4H6O6 solutions. Molybdenum dissolution in H2O2-NaOH solution. image