Abstract
Leaching studies of nickel(II) oxide and hydroxide, and high valence nickel hydroxide in sulphuric acid and in ammonium carbonate solutions were carried out. The dissolution rate of nickel(II) oxide in both solvents was influenced greatly by the heat treatment given to the oxide prior to leaching and, under the conditions studied, was found to be limited by the rate of the surface chemical reactions. The rates of leaching of nickel(II) and nickel(III) hydroxides on the other hand were very fast. The nickel(III) hydroxide is unstable and decomposes to liberate oxygen in acid solutions and oxidises ammonia to nitrogen and nitrite in ammoniacal solutions.
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