Abstract
This paper describes a hydrolytic stripping, in which the nickel-loaded phosphinic acid extractant (Cyanex 272) in aliphatic hydrocarbon was directly hydrolyzed by water at elevated temperatures to strip and recover nickel as hydroxide precipitates. This recovery route to nickel hydroxide is a combined process of the stripping and precipitation stages in a conventional solvent extraction. When contacted with water at 170−220 °C and 0.8−2.5 MPa for 2 h, the nickel phosphinate solution gave precipitates of nickel hydroxide. The resulting hydroxide powders were submicron sized agglomerates of very fine crystallites, which were readily calcined to nickel oxides at 280 °C in air within 24 h. The rates of hydroxide precipitation in a batch autoclave were sensitive to processing parameters such as liquid-phase stirring speed, temperature, and organic-phase compositions.
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