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<p>Considering economics and environmental protection, the agitation leaching technology using sulfuric acid is considered a preferred alternative to recover copper oxide ores in the copper industry. However, this process is still extremely difficult to extract copper from some complex polymetallic and refractory oxide ores, such as copper oxide ores with high alkalinity gangues (HAG) and high binding rates (HBR), respectively. In this paper, a novel and high-efficiency extraction process involving agitation leaching with self-pressurizing technology at low temperatures is proposed to improve copper extraction of the refractory HAG and HBR copper oxide ores from Tibet. Under the self-pressurizing agitation leaching process, the effects of leaching parameters are investigated on copper extraction and other elements dissolution including aluminum, arsenic, and iron, respectively. The results show that the self-pressurizing leaching technology of complex copper oxide ores has some advantages, including relatively simple to apply, environmentally friendly, energy-saving, and high efficiency, especially the higher copper extraction (more than 98.0%) over the conventional agitation leaching process in the sulfuric acid media. Under optimum experimental conditions of mass ratio of copper oxide ores of 5:5, agitation speed of 400&#xa0;rpm, initial sulfuric acid concentration of 4.0&#xa0;mol/L, and leaching time of 60&#xa0;min at 80&#xa0;°C, the copper extraction reached 98.9%, while the maximum average pressure reached 1.31&#xa0;MPa in the closed reaction vessel. The self-pressurizing leaching technology can significantly improve the adaptability of the conventional agitation leaching technology to the refractory copper oxide ore without adding the other reagent.</p> Graphical Abstract <p></p>

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A Novel and High-Efficiency Approach to Improve the Sustainability of Agitation Leaching Technology to Refractory Copper Oxide Ore Using the Self-Pressurizing Technology

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Jian Wang,
  • Xin Zeng,
  • Xuwen Liu,
  • Wenlong Xu,
  • Yue Pan,
  • Jinhui Li,
  • Ruixiang Wang,
  • Yanfei Xiao,
  • Zhifeng Xu

摘要

Considering economics and environmental protection, the agitation leaching technology using sulfuric acid is considered a preferred alternative to recover copper oxide ores in the copper industry. However, this process is still extremely difficult to extract copper from some complex polymetallic and refractory oxide ores, such as copper oxide ores with high alkalinity gangues (HAG) and high binding rates (HBR), respectively. In this paper, a novel and high-efficiency extraction process involving agitation leaching with self-pressurizing technology at low temperatures is proposed to improve copper extraction of the refractory HAG and HBR copper oxide ores from Tibet. Under the self-pressurizing agitation leaching process, the effects of leaching parameters are investigated on copper extraction and other elements dissolution including aluminum, arsenic, and iron, respectively. The results show that the self-pressurizing leaching technology of complex copper oxide ores has some advantages, including relatively simple to apply, environmentally friendly, energy-saving, and high efficiency, especially the higher copper extraction (more than 98.0%) over the conventional agitation leaching process in the sulfuric acid media. Under optimum experimental conditions of mass ratio of copper oxide ores of 5:5, agitation speed of 400 rpm, initial sulfuric acid concentration of 4.0 mol/L, and leaching time of 60 min at 80 °C, the copper extraction reached 98.9%, while the maximum average pressure reached 1.31 MPa in the closed reaction vessel. The self-pressurizing leaching technology can significantly improve the adaptability of the conventional agitation leaching technology to the refractory copper oxide ore without adding the other reagent.

Graphical Abstract