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Hydrothermal Synthesis and Stability Evaluation of Iron (III)-Aluminum (III) Arsenate Solid Solutions

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In this work, the hydrothermal synthesis and the chemical stability of several Fe (III)-Al (III) arsenate solid solution materials (Fe1−x Al x AsO4 · 2H2O) are described. Their synthesis involved hydrothermal precipitation at 160 °C from Fe (III)-Al (III)-As (V) nitrate solutions with fixed [As] = 0.3 M and ([Fe] + [Al]) = 0.33 M over a period of 24 hours. The produced solid solutions are compared to the two end members of the series, namely, scorodite (FeAsO4 · 2H2O) and mansfieldite (AlAsO4 · 2H2O). The members of the solid solution series were found to exhibit some differences in terms of particle size, shape, morphology, lattice parameters, and stability as a function of the Al fraction in the scorodite structure. It appears that materials with low Al content exhibit characteristics similar to scorodite, whereas materials with high Al content resemble mansfieldite. Extended leachability studies (up to 6 weeks) in the pH range 3 to 7 at 22 °C showed that their stability decreases with increasing Al fraction in their structure.

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Acknowledgments

The authors are grateful to Anne Fagot for her help with the stability experiments. Funding for this research was received through a NSERC Strategic Projects grant. The research was sponsored by Barrick Gold Corporation, Areva Resources, Hatch Ltd., and Placer Dome Inc.

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Author notes

  1. T.C. Cheng (Postdoctoral Student, Postdoctoral Research Fellow)

    Present address: McGill University, Ottawa, ON, Canada, K1A0G8

Authors and Affiliations

  1. Department of Mining, Metals and Materials Engineering, McGill University, Montreal, QC, Canada, H3A 2B2

    J.F. Le Berre (Postdoctoral Student), T.C. Cheng (Postdoctoral Student, Postdoctoral Research Fellow), R. Gauvin (Professors) & G.P. Demopoulos (Professors)

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  1. J.F. Le Berre
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  2. T.C. Cheng
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  3. R. Gauvin
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  4. G.P. Demopoulos
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Corresponding author

Correspondence to G.P. Demopoulos.

Additional information

Manuscript submitted June 19, 2006.

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Le Berre, J., Cheng, T., Gauvin, R. et al. Hydrothermal Synthesis and Stability Evaluation of Iron (III)-Aluminum (III) Arsenate Solid Solutions. Metall Mater Trans B 38, 159–166 (2007). https://doi.org/10.1007/s11663-007-9032-7

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  • DOI: https://doi.org/10.1007/s11663-007-9032-7

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