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<p>This study addresses the optimization of copper leaching by evaluating the kinetic impacts of ball grinding (BG) and IsaMill Grinding (IG) on the process. The shrinking core and Avrami models were employed to analyze the effects of temperature (35–75°C), H<sub>2</sub>SO<sub>4</sub> concentration (0.2–1.5&#xa0;M), leaching time (0.5–2.5&#xa0;h), stirring speed (100–500&#xa0;rpm), and solid/liquid ratio (0.10–0.30) on copper recovery. BG treatment delineated the leaching process into three distinct stages: a flash stage (0–2&#xa0;min), a rapid stage (2–30&#xa0;min), and a sluggish stage (30–120&#xa0;min), with the rate-controlling step transitioning from film diffusion to chemical reaction and eventually to a mixed control mechanism. Conversely, IG treatment simplified the process into two stages, consistently governed by diffusion control. Notably, IG treatment significantly enhanced leaching efficiency, attributable to mechanical activation that lowers the activation energy, especially during the sluggish stage. Furthermore, IG can reduce acid consumption based on a low reaction order concerning acidity, optimizing overall process efficiency. These findings underscore the potential of IG as a superior method for copper leaching, offering both enhanced kinetics and reduced environmental impact.</p>

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Comparative Kinetics of Complex Copper Oxide Ore Dissolution: Insights from Ball Grinding and IsaMill Grinding

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • Gairong Wang,
  • Hongying Yang,
  • Suxing Zhao,
  • Yanhua Liu

摘要

This study addresses the optimization of copper leaching by evaluating the kinetic impacts of ball grinding (BG) and IsaMill Grinding (IG) on the process. The shrinking core and Avrami models were employed to analyze the effects of temperature (35–75°C), H2SO4 concentration (0.2–1.5 M), leaching time (0.5–2.5 h), stirring speed (100–500 rpm), and solid/liquid ratio (0.10–0.30) on copper recovery. BG treatment delineated the leaching process into three distinct stages: a flash stage (0–2 min), a rapid stage (2–30 min), and a sluggish stage (30–120 min), with the rate-controlling step transitioning from film diffusion to chemical reaction and eventually to a mixed control mechanism. Conversely, IG treatment simplified the process into two stages, consistently governed by diffusion control. Notably, IG treatment significantly enhanced leaching efficiency, attributable to mechanical activation that lowers the activation energy, especially during the sluggish stage. Furthermore, IG can reduce acid consumption based on a low reaction order concerning acidity, optimizing overall process efficiency. These findings underscore the potential of IG as a superior method for copper leaching, offering both enhanced kinetics and reduced environmental impact.