Process optimization of nickel extraction from hazardous waste

Mahdi Gharabaghi 1 , Mehdi Irannajad 2 , Amir Reza Azadmehr 2  and Majid Ejtemaei 2
  • 1 School of Mining Engineering, College of Engineering, University of Teheran, Kargar St., Teheran, Iran
  • 2 Department of Mining and Metallurgical Eng., Amirkabir University of Technology, Hafez Ave., Tehran, Iran


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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