Simultaneous dissolution of zinc ferrite and precipitation of ammonium jarosite

F. Elgersma*, Geert-Jan Witkamp, G. M. Van Rosmalen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Zinc ferrite (ZnO·Fe2O3) was converted, in a single-step seeded batch process, into ammonium jarosite (NH4Fe3(SO4)2(OH)6) at 95°C and at a pH which was kept constant at either 1.7 or 1.95. The conversion consists of the dissolution of zinc ferrite, which could be described by a surface reaction controlled shrinking core model, and the simultaneous precipitation of ammonium jarosite, which is also a surface-reaction-controlled process. The supersaturation during conversion for the precipitation of jarosite was calculated from the solution composition. At pH 1.7 virtually 100% conversion of zinc ferrite is achieved. This leads to a residual zinc content of the solids produced of below 0.1 wt%. X-ray diffraction analyses of the product showed correspondingly small amounts of zinc ferrite. This indicates that the zinc incorporation in the jarosite lattice is practically negligible. The advantages of such a controlled conversion process for industrial practice are discussed.

Original languageEnglish (US)
Pages (from-to)23-47
Number of pages25
Issue number1
StatePublished - Jan 1 1993

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry


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