KINETICS OF THE REDUCTION OF MNO2 WITH FE2+ IONS IN ACIDIC SOLUTIONS

TEKİN T., BAYRAMOĞLU M. R.

HYDROMETALLURGY, cilt.32, sa.1, ss.9-20, 1993 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 32 Sayı: 1
  • Basım Tarihi: 1993
  • Doi Numarası: 10.1016/0304-386x(93)90053-g
  • Dergi Adı: HYDROMETALLURGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.9-20
  • Atatürk Üniversitesi Adresli: Evet

Özet

The kinetics of the reduction of MnO2 by Fe2+ ions in H2SO4 solution were investigated under well-defined hydrodynamic conditions. The reaction was monitored potentiometrically using a saturated calomel electrode and a Pt electrode. The effect of stirring rate, particle size, temperature, Fe2+ and H+ concentrations were studied. Under high agitation, diffusional resistances are negligible and the rate is controlled by chemical reaction. Evidence supporting this conclusion is given. The kinetic data have been analysed using the ''shrinking core model'' equation. The rate was found to be proportional to [Fe2+]0.5.[H+]0.5 and the apparent activation energy was determined as 28 kJ/mol. The final rate equation is as follows: 1-(1-X)1/3=0.7 10(7)[Fe2+]0.5.[H+]0.5.exp(-28000/RT).t/rho.d0.