Production of Zinc Oxide from Hazardous Waste – Sal Ammoniac Skimming

  • Jana Piroskova Technical University of Kosice, Faculty of Materials, Metallurgy and Recycling, Institute of Recycling Technologies
  • Jarmila Trpcevska Technical University of Kosice, Faculty of Materials, Metallurgy and Recycling, Institute of Recycling Technologies
  • Dusan Orac Technical University of Kosice, Faculty of Materials, Metallurgy and Recycling, Institute of Recycling Technologies
  • Martina Laubertova Technical University of Kosice, Faculty of Materials, Metallurgy and Recycling, Institute of Recycling Technologies
  • Hedviga Horvathova Technical University of Kosice, Faculty of Materials, Metallurgy and Recycling, Institute of Recycling Technologies
  • Blanka Holkova

Abstract


This article deals with hydrometallurgical treatment with the subsequent precipitation of zinc from hazardous waste Sal-Ammoniac Skimming produced in wet hot-dip galvanizing process. Chemical analysis showed that skimming contained 46.64% Zn. X-ray diffraction analysis identified the Zn(OH)Cl phase (96.36%) and NH4Cl (3.64%) in Sal-Ammoniac Skimming. The skimming was first subjected to leaching in order to extract zinc into the solution in HCl, followed by precipitation of the zinc. From the experiments performed in a medium of HCl at concentrations of 0.25, 0.5, 1 and 2M. Complete dissolution of zinc in the solution was achieved in 0.5M HCl, at 40°C, L:S = 20, max. 30 min. The apparent activation energy of leaching reaction by hydrochloric acid solution was Ea = 5.543 kJ mol-1. Zn precipitation was carried out using Na2CO3 and NaOH. Zinc oxide with a purity of about 99% was obtained directly from the solution of 6M NaOH at a temperature of 60°C – 80°C at pH 8.8.

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Published
2018/12/27
How to Cite
Piroskova, J., Trpcevska, J., Orac, D., Laubertova, M., Horvathova, H., & Holkova, B. (2018). Production of Zinc Oxide from Hazardous Waste – Sal Ammoniac Skimming. Journal of Mining and Metallurgy, Section B: Metallurgy, 54(3), 377. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/18012
Issue
Vol. 54 No. 3 (2018)
Section
Original Scientific Paper

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