Determination of kinetic parameters of crystal growth rate of borax in aqueous solution by using the rotating disc technique


Sahin Ö., Aslan F., Ozdemir M., Durgun M.

JOURNAL OF CRYSTAL GROWTH, vol.270, no.3-4, pp.604-614, 2004 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 270 Issue: 3-4
  • Publication Date: 2004
  • Doi Number: 10.1016/j.jcrysgro.2004.06.050
  • Journal Name: JOURNAL OF CRYSTAL GROWTH
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.604-614
  • Keywords: mass transfer, roughening, stirring, growth from solutions, borates, rotating disc, SODIUM PERBORATE, BORIC-ACID, DISSOLUTION
  • Istanbul Technical University Affiliated: No

Abstract

Growth rate of polycrystalline disc of borax compressed at different pressure and rotated at various speed has been measured in a rotating disc crystallizer under well-defined conditions of supersaturation. It was found that the mass transfer coefficient, K, increased while overall growth rate constant, K-g and surface reaction constant, k(r), decreased with increasing smoothness of the disc. It was also determined that kinetic parameters (k(r), r, K, g) of crystal growth rate of borax decreased with increasing rotating speed of the polycrystalline disc. The effectiveness factor was calculated from the growth rate data to evaluate the relative magnitude of the steps in series bulk diffusion through the mass transfer boundary layer and the surface integration. At low rotating speed of disc, the crystal growth rate of borax is mainly controlled by integration. However, both diffusion and integration steps affect the growth rate of borax at higher rotating speed of polycrystalline disc. (C) 2004 Elsevier B.V. All rights reserved.