?REACTION KINETICS FOR THE LEACHING OF IMPURITIES FROM ROCK PHOSPHATE

Authors

  • E 0 Olanipekun Department of Chemistry, Ondo State 'University, Ado-Ekiti, Nigeria
  • J T Bamgbose Department of Chemical Science, University of Agriculture, Abeokuta, Nigeria

Keywords:

Impurities, Kinetics, Leaching,Rock phosphate.

Abstract

This paper presents a kinetic study of the leaching of iron and magnesium impurities from rock phosphate with
hydrochloric acid.The effects of particle size, stirring speed,hydrochloric acidconcentration andreaction tempera-
ture on the leaching rate were investigated. The data fitted a shrinking core model equation with reaction rate
controlled by a diffusion mechanism. The rate was related to temperature by the Arrhenius relationship with the
apparent activation energy being 18. 7kJ mol" for iron and 14.3kJ mol'1 for magnesium. The rate was linearly
dependent onhydrochloric acidconcentrationandinverselyproportionaltotheaveragediameteroftheparticles.The
leachingrateofmagnesiumwasrelativelyfasterthanthatofironbutbothexhibitedsimilarleachingpatternunder the
same reactionconditions.

Published

1998-06-22

How to Cite

Olanipekun, E. 0, & Bamgbose, J. T. (1998). ?REACTION KINETICS FOR THE LEACHING OF IMPURITIES FROM ROCK PHOSPHATE. Biological Sciences - PJSIR, 41(3), 116–120. Retrieved from https://v2.pjsir.org/index.php/biological-sciences/article/view/2248

Issue

Vol. 41 No. 3 (1998): Pakistan Journal of Scientific and Industrial Research

Section

Articles