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We tested licorice concentrations ranging from 25 to 100 ppm in a simulated copper electrowinning (Cu-EW) solution for acid mist suppression efficiency. Current densities between 280 and 380 A/m2 were tested. We also examined the influence of licorice addition on other operational parameters, including current efficiency, cell potential, and energy consumption. Introducing licorice into the Cu-EW solution had a negligible impact on current efficiency, which remained above 98%. With licorice concentrations above 50 ppm, we achieved an acid mist suppression efficiency exceeding 99%. Regardless of the applied current density, 100 ppm of licorice formed a foam layer of about 3.5 cm on the surface of the electrolyte, which acted as a barrier against acid mist release.

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The Efficacy of Licorice (Glycyrrhiza spp.) as an Acid Mist Suppressant in Copper Electrowinning

  • 会议论文

  • 发表日期：

    2025年

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  • Kashif Mairaj Deen,
  • Hossein Zargarnezhad,
  • Liz Hall,
  • Jeffrey S. Robinson,
  • Edouard Asselin

摘要

We tested licorice concentrations ranging from 25 to 100 ppm in a simulated copper electrowinning (Cu-EW) solution for acid mist suppression efficiency. Current densities between 280 and 380 A/m2 were tested. We also examined the influence of licorice addition on other operational parameters, including current efficiency, cell potential, and energy consumption. Introducing licorice into the Cu-EW solution had a negligible impact on current efficiency, which remained above 98%. With licorice concentrations above 50 ppm, we achieved an acid mist suppression efficiency exceeding 99%. Regardless of the applied current density, 100 ppm of licorice formed a foam layer of about 3.5 cm on the surface of the electrolyte, which acted as a barrier against acid mist release.