Leaching Zinc from Crystallization Slag by Acid Leaching: Process Optimization Using Response Surface Methodology

  • Guojiang Li
  • Yongguang Luo
  • Tingfang XieEmail author
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


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.


Zinc Crystallization slag Acid leaching Response surface methodology 


  1. 1.
    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
  2. 2.
    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
  3. 3.
    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
  4. 4.
    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
  5. 5.
    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
  6. 6.
    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
  7. 7.
    Cantarino MV, Filho CDC, Mansur MB (2012) Selective removal of zinc from basic oxygen furnace sludges. Hydrometallurgy s111–112(1):124–128CrossRefGoogle Scholar
  8. 8.
    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
  9. 9.
    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
  10. 10.
    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
  11. 11.
    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

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Yunnan Chihong Zn & Ge Co., LtdQujingChina

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