Selective leaching of nickel from mixed nickel cobalt hydroxide precipitate

Williams, Chelsea, Hawker, William and Vaughan, James William (2013) Selective leaching of nickel from mixed nickel cobalt hydroxide precipitate. Hydrometallurgy, 138 84-92. doi:10.1016/j.hydromet.2013.05.015


Author Williams, Chelsea
Hawker, William
Vaughan, James William
Title Selective leaching of nickel from mixed nickel cobalt hydroxide precipitate
Journal name Hydrometallurgy   Check publisher's open access policy
ISSN 0304-386X
1879-1158
Publication date 2013-06
Sub-type Article (original research)
DOI 10.1016/j.hydromet.2013.05.015
Volume 138
Start page 84
End page 92
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2014
Language eng
Abstract A new method for acid leaching mixed nickel-cobalt hydroxide precipitate (MHP) is proposed; whereby nickel is largely dissolved while cobalt and manganese are stabilised in the solid phase by preferential oxidation. The relevant oxidation thermodynamics are presented. Metal extraction and leaching kinetics were not significantly affected by temperature over the range tested (30-80 C), or by the length of MHP ageing prior to leaching (three months vs. four years). Calcium and magnesium are the major solution impurities (0.1 g-Ca/L, 3 g-Mg/L). A portion of the calcium and magnesium can be selectively leached from the MHP at pH 7. Thermodynamic analysis indicates that the leaching of nickel and the onset of copper and zinc leaching can be predicted assuming MHP is an ideal solid solution. Both thermodynamic analysis and chemical assay confirm that the nickel hydroxyl-sulphate stoichiometry is approximately Ni 7(OH)12SO4. The Gibbs energy of formation of metastable Ni7(OH)12SO4 at 80 C (353 K) was estimated to be - 3356 kJ/mole.
Keyword Leaching
Mixed hydroxide
Nickel
Thermodynamics
Oxidation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
 
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Created: Sun, 06 Oct 2013, 00:17:35 EST by System User on behalf of School of Chemical Engineering