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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Das B, Prakash S, Reddy PSR et al (2007) An overview of utilization of slag and sludge from steel industries. Resour Conserv Recycl 50(1):40–57CrossRefGoogle Scholar
Jessop A, Turner A (2011) Leaching of Cu and Zn from discarded boat paint particles into tap water and rain water. Chemosphere 83(11):1575–1580CrossRefGoogle Scholar
Qian LI, Zhang B, Min XB et al (2013) Acid leaching kinetics of zinc plant purification residue. Trans Nonferrous Met Soc China 23(9):2786–2791CrossRefGoogle Scholar
Suárezgómez SL, Sánchez ML, Blanco F et al (2017) Successful sulfur recovery in low sulfurate compounds obtained from the zinc industry: evaporation-condensation method. J Hazard Mater 336:168–173CrossRefGoogle Scholar
Sethurajan M, Huguenot D, Jain R et al (2016) Leaching and selective zinc recovery from acidic leachates of zinc metallurgical leach residues. J Hazard Mater 324(Pt A):71Google Scholar
Ma AY, Zheng XM, Li SW et al (2018) Zinc recovery from metallurgical slag and dust by coordination leaching in NH3–CH3COONH4–H2O system. R Soc Open Sci 5:180660CrossRefGoogle Scholar
Cantarino MV, Filho CDC, Mansur MB (2012) Selective removal of zinc from basic oxygen furnace sludges. Hydrometallurgy s111–112(1):124–128CrossRefGoogle Scholar
Ma AY, Zhang LB, Peng JH et al (2016) Extraction of zinc from blast furnace dust in ammonia leaching system. Green Process Synth 5(1):23–30Google Scholar
Ahmed IM, Nayl AA, Daoud JA (2016) Leaching and recovery of zinc and copper from brass slag by sulfuric acid. J Saudi Chem Soc 20:S280–S285CrossRefGoogle Scholar
Ma AY, Zheng XM, Zhang LB et al (2018) Clean recycling of zinc from blast furnace dust with ammonium acetate as complexing agents. Sep Sci Technol 53(9):1–15CrossRefGoogle Scholar
Wang BB, Li ZQ, Zhang LB et al (2014) RSM optimization of process parameters for dechlorination by microwave roasting from zinc oxide dust from waelz kiln. J Microwav Power Electromagn Energy 48(4):233–243CrossRefGoogle Scholar