Incorporation of zinc in continuous jarosite precipitation

F. Elgersma*, G. J. Witkamp, G. M. van Rosmalen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Ammonium jarosite was precipitated in a 1.5 l continuous Mixed Suspension Mixed Product Removal crystallizer in the presence of varying feed Zn2+, Mg2+, Li+ and NH+4 concentrations. The feed Fe3+ concentration and SO2-4 concentration were kept constant at 0.25 M and 1.6 M, respectively. The experiments were carried out at 95°C and pH 1.5, using residence times varying between 0.8 and 2.0 h. The following parameters were determined: steady state conversion, the jarosite crystal growth rate, the nucleation rate, the specific surface area, the solids density in the suspension, the production rate, the supersaturation and the incorporation of zinc or magnesium in the jarosite lattice. The residence time distribution of the system was determined by adding alunite as tracer. Additional experiments were carried out at a pH of 1.2 and 1.8 respectively, in order to determine the influence of the pH on the precipitation. Based on the results obtained the incorporation of zinc in jarosite or the jarosite production rate may be predicted for a wide range of process conditions. The incorporation of zinc in ammonium jarosite, probably via isomorphous substitution, is about 2-10 g/kg depending on the process conditions. This implies that in industrial practice the loss of zinc due to the removal of iron as jarosite ranges between 0.12 and 0.6 wt%, for a zinc concentrate containing 52 wt% zinc and 8 wt% iron.

Original languageEnglish (US)
Pages (from-to)313-339
Number of pages27
JournalHydrometallurgy
Volume33
Issue number3
DOIs
StatePublished - Jan 1 1993
Externally publishedYes

ASJC Scopus subject areas

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

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