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On the variable dissolution kinetics of zinc ferrite in acid media
Author(s) -
Filippou Dimitrios,
Demopoulos George P.
Publication year - 1993
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450710518
Subject(s) - dissolution , zinc ferrite , ferrite (magnet) , chemistry , zinc , nuclear chemistry , kinetics , metallurgy , materials science , mineralogy , physics , composite material , quantum mechanics
Different magnetic fractions of narrow‐sized industrial residues of zinc ferrite [(Zn 1‐x , Fe x 2+ )Fe 2 3+ O 4 , x ≤ 0.4] have been leached with 1 mol/L H 2 SO 4 at temperatures ranging from 348 to 368 K. Fractions with excess iron, which exhibit higher magnetic susceptibility, are found to dissolve faster. It is believed that the lattice substitution of Zn by Fe 2+ in the more magnetic ferrite fractions creates crystal defects and renders the ferrite more chemically reactive. An interfacial electrochemical reaction mechanism has been advanced to account for the effects of solid state composi tion and solution composition on the variation of the dissolution kinetics of zinc ferrite. Finally, the practical implications of these findings on the industrial leaching of zinc ferrite are briefly addressed.