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<p>Spent hydrodesulfurization (HDS) catalysts are valuable secondary resources for recovering critical metals such as tungsten (W) and molybdenum (Mo). This study proposes a new pressurized oxygen-enriched sodium salt leaching process to enhance the recovery efficiency of W and Mo. By optimizing roasting parameters and leaching conditions, the leaching efficiencies of 94.1% for W&#xa0;and&#xa0;99.5% for Mo&#xa0;were achieved. The synergistic combination of sodium salt roasting and pressurized oxygen leaching effectively converted refractory sulfides into soluble tungstate and molybdate ions. The results revealed that sodium salts promoted the formation of porous oxide intermediates during roasting, and pressurized oxygen facilitated oxidative dissolution of metal phases. The process not only addresses environmental risks associated with spent catalyst disposal but also contributes to sustainable metal recovery, aligning with circular economy principles.</p> Graphical Abstract <p></p>

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Efficient Recovery of Tungsten and Molybdenum from Spent HDS Catalysts via Synergistic Sodium Salt Roasting and Pressurized Oxygen-Enriched Leaching

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • Han Yang,
  • Jing Wang,
  • Yue Jiang,
  • Hang Wu,
  • Chaohui Zhou,
  • Junbao Pang,
  • Jianchao Zhou,
  • Yuhang Yu,
  • Wei Xu

摘要

Spent hydrodesulfurization (HDS) catalysts are valuable secondary resources for recovering critical metals such as tungsten (W) and molybdenum (Mo). This study proposes a new pressurized oxygen-enriched sodium salt leaching process to enhance the recovery efficiency of W and Mo. By optimizing roasting parameters and leaching conditions, the leaching efficiencies of 94.1% for W and 99.5% for Mo were achieved. The synergistic combination of sodium salt roasting and pressurized oxygen leaching effectively converted refractory sulfides into soluble tungstate and molybdate ions. The results revealed that sodium salts promoted the formation of porous oxide intermediates during roasting, and pressurized oxygen facilitated oxidative dissolution of metal phases. The process not only addresses environmental risks associated with spent catalyst disposal but also contributes to sustainable metal recovery, aligning with circular economy principles.

Graphical Abstract