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2025 Vol.35, Issue 2 Preview Page

Research Paper

Mo Recovery from Waste Hydrotreating Catalyst via Tributyl Phosphate
Yongyang Bu1
,
Haitao Wu1
,
Kejie Hu1
,
Dazhuang Huang12†
,
Tian Ai1
,
Songdong Yao1†
1School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China
2School of Graduate, University of Science and Technology Liaoning, Anshan 114051, China
†Corresponding author E-Mail : 2714801720@qq.com (D. Huang, Univ. Sci. Technol. Liaoning) stoneyao@163.com (S. Yao, Univ. Sci. Technol. Liaoning)
27 February 2025. pp. 69-81
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Abstract

This study investigated the process of reclaiming Mo from calcined waste hydrotreating (CWHT) catalysts using tributyl phosphate (TBP) as an extractant with electron-withdrawing properties. Using inductively coupled plasma (ICP) technology, the optimal operating conditions for Mo recovery were determined based on the metal ion content in different processes. Considering the pH impact on metal species in solution, an acid leaching solution with 6 M sulfuric acid was employed. After 3 h of reaction, 94 wt% of the Mo was transferred from the WHT catalyst to the acid leaching solution. Adjusting the filtrate to a pH of 1.5 allowed the TBP to selectively extract over 98.8 wt% of Mo from the aqueous filter solution into the organic phase. MC-Cabe-Thiele theory predicts that a three-stage countercurrent extraction can reduce Mo to less than 0.2 wt%. Stripping moved approximately 98 wt% of the Mo from the organic to the inorganic phases. The recovered colorless organic tributyl phosphate can be used in the recycled extraction process.

Keywords
tributyl phosphate
waste catalyst recovery
inductively coupled plasma
organic solvent
Mo metal recovery
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 35
  • No :2
  • Pages :69-81
  • Received Date : 2024-12-16
  • Revised Date : 2025-01-16
  • Accepted Date : 2025-02-03
  • DOI :https://doi.org/10.3740/MRSK.2025.35.2.69
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