Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (10): 1287-1290.doi: 10.3866/PKU.WHXB20061022

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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:2006-04-11 Revised:2006-05-23 Published:2006-10-11
  • Contact: GÜR 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 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.

Key words: Ulexite;Dissolution kinetics;High solid-to-liquid ratios;Ammonium chloride