Liquid-phase mass transfer of ZnO-H2so4 solution system in an agitated vessel

Katsutoshi Matsumoto, Shoji Taniguchi, Atsushi Kikuchi

Research output: Contribution to journalArticlepeer-review

Abstract

Experimental and theoretical studies on the initial leaching rate of a spherical pellet of ZnO introduced in H2SO4 and H 2SO4- ZnSO4 solution have been conducted to discuss the characteristics of liquid-phase mass transfer for ZnO-H 2SO4 solution systems in an agitated vessel. The results obtained are as follows: 1) For the ZnO-H2SO4 systems, the leaching rate is proportional to the 0.6th power of the stirring rate. The leaching rate increases with the concentration of H2SO4 and H+. 2) For the ZnO-H2SO4-ZnSO4 systems, the leaching rate increases with the concentration of ZnSO4. At a high concentration of H+, the rate is independent of the concentration of H+. 3) The leaching process for these systems is controlled by the liquid-phase mass transfer rate. 4) For the ZnO-H 2SO4 and ZnO-H2SO4-ZnS04 systems, the rates calculated by a mass-transfer model based on a film theory that takes into account diffusion and electrical migration are in good agreement with the experimental values at a low concentration of H+. However, the calculated values are not consistent with the experimental values at high concentration. This disagreement might be caused by the effect of chemical reaction at the ZnO surface.

Original languageEnglish
Pages (from-to)135-139
Number of pages5
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume71
Issue number1
DOIs
Publication statusPublished - 2007 Jan

Keywords

  • Acid solution
  • Electrical migration
  • Leaching, dissolution
  • Mass transfer
  • ZnO

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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