Abstract

The crystallization slag from zinc hydrometallurgy plant contains large quantity of zinc. The present study attempts to extract zinc using sulphuric acid as a leaching agent. The effect of important parameters such as leaching time, liquid/solid ratio, leaching temperature and the sulphuric acid concentration was investigated and the process conditions were optimized using response surface methodology (RSM) based on central composite design (CCD). The optimum condition for leaching of zinc from crystallization slag was identified to be a leaching time of 32.4 min, a liquid/solid ratio of 5.3, stirring speed of 200 r/min, sulphuric acid concentration of 47.12 g/L, and leaching temperature of 30 °C. A maximum of 81.17% of zinc was recovered under the optimum experimental conditions. The proposed model equation using RSM has shown good agreement with the experimental data, with a correlation coefficient (R2) of 0.9870.

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