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Citation: GÜR Aycan. Dissolution Kinetics of Calcined Ulexite in Ammonium Chloride Solutions at High Solid-to-Liquid Ratios[J]. Acta Physico-Chimica Sinica, ;2006, 22(10): 1287-1290. doi: 10.3866/PKU.WHXB20061022 shu

Dissolution Kinetics of Calcined Ulexite in Ammonium Chloride Solutions at High Solid-to-Liquid Ratios

GÜR Aycan

1.
Science & Art Faculty, Department of Chemistry, Yüzüncü Yil University, VAN-TURKEY

Received Date: 11 April 2006
Available Online: 11 October 2006

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 pre-hydration 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: (1−X(B2O3))−1−1=k(c(NH4Cl))1.982t. The activation energy for the dissolution of the ulexite sample calcined at 160 ℃ was found to be 84.04 kJ•mol−1.
- Ulexite;Dissolution kinetics;High solid-to-liquid ratios;Ammonium chloride
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