Liquid phase mass transfer of ZnO-acid solution systems in an agitated vessel

Katsutoshi Matsumoto, Shoji Taniguchi, Atsushi Kikuchi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Experimental and theoretical studies on the initial leaching rate of a spherical pellet of ZnO in HA (A = ClO4, NO3, Cl), HA-ZnA2 and HA-NaA solution have been made to discuss the characteristics of liquid phase mass transfer for ZnO-acid solution systems in an agitated vessel. The results obtained are as follows: (1) For the ZnO-HA systems, the leaching rate is proportional to the concentration of acid and 0.6 power of stirring rate, and also is the same for three different acids. (2) For the ZnO-HA-ZnA2 systems, the rate is same for three different acids and increases with concentration of ZnA2. At high concentration of ZnA2, however, the rate is different for each acid. (3) For the ZnO-HA-NaA systems, the rate is the same for three different acids, and increases with NaA concentration. (4) The results of dissolution rate of benzoic acid into aqueous solution and leaching rate for the ZnO-HA systems show that the leaching process for the systems studied is controlled by the liquid phase mass transfer. (5) The rates calculated by a mass-transfer model based on a film theory involving diffusion and electrical migration are consistent with the experimental ones for the ZnO-HA, ZnO-HA-NaA and ZnO-HA-Zn (CIO4)2 systems. For the ZnO-HA-Zn(NO3)2 and the ZnO-HA-ZnCl2 systems, the calculated values are not consistent with the experimental ones at a high concentration of ZnA2, although the model gives good agreement between the two values at a low concentration of ZnA2.

Original languageEnglish
Pages (from-to)853-859
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume55
Issue number8
DOIs
Publication statusPublished - 1991

ASJC Scopus subject areas

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

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