Selective leaching of nickel from mixed nickel cobalt hydroxide precipitate
C Williams, W Hawker, JW Vaughan - Hydrometallurgy, 2013 - Elsevier
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 …
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 …
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