Abstract
Zinc plant residue is a hazardous waste which contains high quantity of
nickel and other valuable metals. Process parameters such as reaction
time, acid concentration, solid-liquid ratio, particle size, stirring
speed and temperature for nickel extraction from this waste were optimized
using factorial design. Main effects and their interactions were obtained
by the analysis of variance ANOVA. Empirical regression model was obtained
and used to predict nickel extraction with satisfactory results and to
describe the relationship between the predicted results and the experiment
results. The important parameters for maximizing nickel extraction were
identifi ed to be a leaching time solid-liquid ratio and acid
concentration. It was found that above 90% of nickel could be extracted in
optimum conditions.
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