Determination of a semi empirical kinetic model for dissolution of metallic copper particles in HNO3 solutions


DEMIR H., OZMETIN C., KOCAKERIM M., Yapici S. , COPUR M.

CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION, cilt.43, ss.1095-1100, 2004 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 43 Konu: 8
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1016/j.cep.2003.11.002
  • Dergi Adı: CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
  • Sayfa Sayıları: ss.1095-1100

Özet

In this study, the dissolution of spherical copper particles with various sizes was investigated in HNO3 solutions, and a mathematical model was evaluated for the dissolution. From the dissolution runs, it was found that the dissolution rate increased with increasing surface area, stirring speed, temperature and nitric acid concentration and decreasing solid-to-liquid ratio. It was shown that the semi-empirical model for spherical copper particles is: 1 - (1 - X)(1/3) = 7188(A)(1)(S/L)(-1/4WC1/3)-C-1/2 e(-47527/RT) t, where X is conversion fraction, A surface area of particle (cm(2) g(-1)), S/L solid-to-liquid ratio (g cm(-3)), W stirring speed (min(-1)), C acid concentration (% w/w), R constant, Ea activation energy (J mol(-1)), t time (min). It was determined that the dissolution rate is controlled by surface chemical reaction. (C) 2003 Elsevier B.V. All rights reserved.