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<p>Chloride ions in zinc smelting accelerate electrode deterioration and corrosion of equipment, reducing the quality of zinc products. Conventional dechlorination technologies for copper slag pose significant challenges, including inefficient mass transfer due to solid-film barriers, limited reactivity due to the low activity of copper slag, and prolonged processing times. This paper proposes an ultrasonic-enhanced reduction deep-dechlorination technology based on rapid chemical reactions, establishing a liquid-phase mass transfer to completely break through the solid film barrier. The optimized parameters obtained for this technology are initial reaction solution pH 3.6, Cu<sup>2+</sup>:Cl⁻:H<sub>2</sub>A molar ratio = 1.5:1:0.75 reaction temperature is 20℃ (room temperature), ultrasonic power density of 26.7 W/L, reaction time of 3 min, achieving a 96.5% reduction in chloride ions, and fast decreasing from 1&#xa0;g/L to 0.0353&#xa0;g/L. As revealed by thermodynamic calculations, compared with the current dechlorination process for copper slag, this method improves reaction kinetics by 18.6%, reduces the thermodynamic potential by 59.3%, and increases the equilibrium constant by a factor of 6.7 × 10<sup>9</sup>. Dynamics calculations show that the calculated energy threshold (E<sub>a</sub>) of the reaction in the ultrasound addition experiment is 37.82&#xa0;kJ/mol. Ultrasound incorporation reduces the activation energy by 24.6%, accelerating the reaction and improving dechlorination efficiency.</p>

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An Ultrasonic Enhanced Reduction Deep Dechlorination Technology Based on Rapid Chemical Reaction

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • Cheng Jiang,
  • Rui Li,
  • Jing Li,
  • Te Zhang

摘要

Chloride ions in zinc smelting accelerate electrode deterioration and corrosion of equipment, reducing the quality of zinc products. Conventional dechlorination technologies for copper slag pose significant challenges, including inefficient mass transfer due to solid-film barriers, limited reactivity due to the low activity of copper slag, and prolonged processing times. This paper proposes an ultrasonic-enhanced reduction deep-dechlorination technology based on rapid chemical reactions, establishing a liquid-phase mass transfer to completely break through the solid film barrier. The optimized parameters obtained for this technology are initial reaction solution pH 3.6, Cu2+:Cl⁻:H2A molar ratio = 1.5:1:0.75 reaction temperature is 20℃ (room temperature), ultrasonic power density of 26.7 W/L, reaction time of 3 min, achieving a 96.5% reduction in chloride ions, and fast decreasing from 1 g/L to 0.0353 g/L. As revealed by thermodynamic calculations, compared with the current dechlorination process for copper slag, this method improves reaction kinetics by 18.6%, reduces the thermodynamic potential by 59.3%, and increases the equilibrium constant by a factor of 6.7 × 109. Dynamics calculations show that the calculated energy threshold (Ea) of the reaction in the ultrasound addition experiment is 37.82 kJ/mol. Ultrasound incorporation reduces the activation energy by 24.6%, accelerating the reaction and improving dechlorination efficiency.