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

Katsutoshi Matsumoto, Shoji Taniguchi, Atsushi Kikuchi

研究成果: Article査読

抄録

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.

本文言語English
ページ(範囲)135-139
ページ数5
ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
71
1
DOI
出版ステータスPublished - 2007 1

ASJC Scopus subject areas

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

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