Simultaneous dissolution of zinc ferrite and precipitation of ammonium jarosite

F. Elgersma; G. J. Witkamp; G. M. Van Rosmalen

doi:10.1016/0304-386X(93)90079-S

Simultaneous dissolution of zinc ferrite and precipitation of ammonium jarosite

F. Elgersma^*, G. J. Witkamp, G. M. Van Rosmalen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

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 language	English (US)
Pages (from-to)	23-47
Number of pages	25
Journal	Hydrometallurgy
Volume	34
Issue number	1
DOIs	https://doi.org/10.1016/0304-386X(93)90079-S
State	Published - Sep 1993
Externally published	Yes

ASJC Scopus subject areas

Industrial and Manufacturing Engineering
Metals and Alloys
Materials Chemistry

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title = "Simultaneous dissolution of zinc ferrite and precipitation of ammonium jarosite",

abstract = "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.",

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AU - Elgersma, F.

AU - Witkamp, G. J.

AU - Van Rosmalen, G. M.

PY - 1993/9

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N2 - 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.

AB - 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.

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Simultaneous dissolution of zinc ferrite and precipitation of ammonium jarosite

Abstract

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