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| Mechanism, challenges, and industrial practice of chain catalytic oxidation for iron and manganese removal in hydrometallurgy |
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Received:December 10, 2024
Revised:December 26, 2024
Accepted:January 15, 2025
Published Online:April 30, 2026
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| DOI：10.3969/j.issn.1005-7854.2025.06.016 |
| KeyWord:chain catalytic oxidation;hydrometallurgy;iron and manganese removal;precise control;industrial trial;valuable metal recovery |
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| 1.BGRIMM Technology Group, Beijing 100160, China;2.Norin Mining Co. Ltd., Beijing 100053, China |
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| Abstract: |
| The efficient removal of impurities such as iron and manganese is crucial for ensuring the quality of the final product in hydrometallurgical processes. While SO2/O2 chain catalytic oxidation technology theoretically offers advantages such as high oxidation efficiency and fast reaction rate, its high sensitivity to process parameters and control strategies leads to issues like unstable performance and poor reproducibility in industrial applications, limiting the realization of its full potential. To address these challenges, this study conducted systematic optimization focused on the bottlenecks in industrial application. Mechanism analysis revealed that the key to achieving stable operation lies in precise process control, efficient reactors, and well-matched regulation strategies. In industrial trials, a sealed multi-stage gas-liquid circulation reactor was employed, along with automated monitoring and precise control methods, to directionally regulate the system's oxidation potential and pH. The experimental results demonstrated that the removal rates of iron and manganese exceeded 99% and reached 86%–97%, respectively. Furthermore, the manganese content in the iron residue increased to about 2.0%, the entrainment loss of main valuable metals such as copper and cobalt was significantly reduced, the settling and filtration performance of the residue improved, and the quality of the downstream product was substantially enhanced. This study proves that establishing a standardized application system centered on "precise control, efficient equipment, and scientific regulation" is key to realizing the industrial value of chain catalytic oxidation technology. These findings provide a reliable technical pathway for the deep removal of impurities and the efficient recovery of valuable metals in hydrometallurgical processes. |
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