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<p>This study proposes an integrated process comprising pretreatment, sodium roasting, water leaching, and selective precipitation to efficiently separate and recover molybdenum and vanadium from spent hydrotreating catalysts. Following pretreatment through air calcination at 450–500°C, the spent catalyst undergoes sodium roasting with a Na<sub>2</sub>CO<sub>3</sub>-to-catalyst mass ratio of 1.5 at 800°C for 2&#xa0;h. This is succeeded by water leaching at 80°C with a solid-to-liquid ratio of 1:10 for 60&#xa0;min, achieving selective leaching of molybdenum and vanadium with extraction rates of 80.35% and 97.97%, respectively. Subsequently, vanadium was precipitated at pH 7.25 with an NH<sub>4</sub>Cl-to-V mass ratio of 10 at 80°C, achieving a vanadium recovery rate of 97.05%. Molybdenum was then precipitated at pH 8.5 with CaCl<sub>2</sub>-to-Mo mass ratio of 10 at 80°C, resulting in a molybdenum recovery rate of 99.01%. A novel Na<sub>3</sub>Y(VO<sub>4</sub>)<sub>2</sub>:Eu<sup>3+</sup> (NYVO:Eu<sup>3+</sup>) phosphor was synthesized using recovered ammonium metavanadate as the raw material through the sol-gel method. This study provides a feasible technical pathway for the green and efficient recovery of molybdenum and vanadium from spent hydroprocessing catalysts.</p>

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Integrated Recovery of Molybdenum and Vanadium from Spent Hydrotreating Catalysts with Recovered Vanadium Applied in Na3Y(VO4)2:Eu3+ Luminescent Materials

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Daheng Wu,
  • Bohan Geng,
  • Hua Qin,
  • Jingbao Lian

摘要

This study proposes an integrated process comprising pretreatment, sodium roasting, water leaching, and selective precipitation to efficiently separate and recover molybdenum and vanadium from spent hydrotreating catalysts. Following pretreatment through air calcination at 450–500°C, the spent catalyst undergoes sodium roasting with a Na2CO3-to-catalyst mass ratio of 1.5 at 800°C for 2 h. This is succeeded by water leaching at 80°C with a solid-to-liquid ratio of 1:10 for 60 min, achieving selective leaching of molybdenum and vanadium with extraction rates of 80.35% and 97.97%, respectively. Subsequently, vanadium was precipitated at pH 7.25 with an NH4Cl-to-V mass ratio of 10 at 80°C, achieving a vanadium recovery rate of 97.05%. Molybdenum was then precipitated at pH 8.5 with CaCl2-to-Mo mass ratio of 10 at 80°C, resulting in a molybdenum recovery rate of 99.01%. A novel Na3Y(VO4)2:Eu3+ (NYVO:Eu3+) phosphor was synthesized using recovered ammonium metavanadate as the raw material through the sol-gel method. This study provides a feasible technical pathway for the green and efficient recovery of molybdenum and vanadium from spent hydroprocessing catalysts.