Removal of Metal Impurities from the Spent Hydroprocessing Catalyst and Acid Leaching Kinetics of Aluminum

Abstract:

The impurity metal of Al in spent hydroprocessing catalyst (Mo-Ni/Al₂O₃) was removed by HCl, and the metals of Mo and Ni were preliminarily enriched. The results show that the leaching efficiency of Al was 88.62%, and the leaching efficiency of Mo and Ni were 16.32% and 28.74%, respectively. The results were achieved under optimal leaching conditions: the particle size was 150 μm, the concentration of HCl was 4 mol/L, the leaching temperature was 90 °C, and the leaching time was 120 min. The kinetics of the leaching behavior of Al showed that the acid leaching reaction of Al was in accorded with the equation 1-2/3X-(1-X) ^2/3=K₂t, R²=0.97734, which was controlled by internal diffusion. X-ray diffraction analysis of the leaching residue revealed the existence of residual metals Mo(MoO₃, MoO₂(ClO₄)₂)and Ni(NiS). The separation of Al from Mo and Ni has been preliminarily realized, which is conducive to further efficient recovery of Mo and Ni.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 1438-1444
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.1438
• Online since: May 2020
• Authors: Zi Jie Yang, Hui Yu, Li Wen Ma*, Xiao Li Xi, Yun He Zhang
• Keywords: Acid Leaching, Aluminum, Mo-Ni, Selective Extraction, Spent Hydroprocessing Catalyst

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