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Kinetic models for the leaching with sulphuric acid of zinc-containing slags

Authors
Journal
Hydrometallurgy
0304-386X
Publisher
Elsevier
Publication Date
Volume
10
Issue
1
Identifiers
DOI: 10.1016/0304-386x(83)90077-4
Disciplines
  • Chemistry

Abstract

Abstract A kinetic model has been obtained for the selective dissolution of the glassy matrix with dilute sulphuric acid at 70–100°C to liberate the zinc-rich phase obtained by reheating Imperial Smelting Process slags at above 900°C. Data were analyzed according to the “shrinking core models” Kt = 1 − (1 − a) 1 3 for chemical control, Kt = 1 − (2 3) a −, (1 − a) 2 3 for diffusion through a solid matrix. The kinetic mechanism can be divided into two stages. The first is chemically controlled, the second diffusion controlled. Experimental data showed a good fit with the proposed equations.

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