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Nickel Loss during Iron Precipitation and Product Characterization

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Abstract:

In this study, the iron precipitation and associated nickel loss from synthetic ferric and nickel sulphate solutions were investigated. Two types of common neutralizing agents, magnesium oxide and calcium carbonate were applied in the investigation. The results indicated that pH and temperature had significant impacts on nickel loss during the iron precipitation process, whereas the type of neutralizing agents had little effect. It was found that increasing in pH and temperature resulted in more nickel loss in the pH range of 2 to 4 and temperature range of 25 to 85 °C. Mineralogical examination by XRD indicated that the iron precipitates were combinations of schwertmannite, ferrihydrite and goethite. In addition, more crystalline goethite was formed from the ferric solutions when no nickel was present, indicating that nickel might play a role in inhabiting the crystallization of goethite.

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Periodical:

Advanced Materials Research (Volume 402)

Pages:

293-296

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.402.293

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Online since:

November 2011

Authors:

Kai Wang, Jian Li, R.G. McDonald, R.E. Browner

Keywords:

Goethite Process, Iron Precipitation, Nickel Laterite, Nickel Loss

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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