Metal leaching from refinery waste hydroprocessing catalyst

The present study aims to develop an eco-friendly methodology for the recovery of nickel (Ni), molybdenum (Mo), and vanadium (V) from the refinery waste spent hydroprocessing catalyst. The proposed process has two stages: the first stage is to separate alumina, while the second stage involves the se...

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Bibliographic Details
Published in:Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Toxic/hazardous substances & environmental engineering, 2018-09, Vol.53 (11), p.951-959
Main Authors: Marafi, Meena, Rana, Mohan S.
Format: Article
Language:English
Subjects:
Aluminum oxide
Ammonium
Ammonium hydroxide
Ammonium salts
Catalysis
Catalysts
Chemical synthesis
Coordination compounds
Economic conditions
Hazardous waste
Heavy metals
Leaching
Metal complexes
Metal compounds
metal recovery
Metals
Molybdenum
Nickel
Reagents
Recovery
Refineries
Refinery wastes
residue hydroprocessing
Salts
spent catalyst
Vanadium
waste utilization
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Summary:The present study aims to develop an eco-friendly methodology for the recovery of nickel (Ni), molybdenum (Mo), and vanadium (V) from the refinery waste spent hydroprocessing catalyst. The proposed process has two stages: the first stage is to separate alumina, while the second stage involves the separation of metal compounds. The effectiveness of leaching agents, such as NH 4 OH, (NH 4 ) 2 CO 3 , and (NH 4 ) 2 S 2 O 8 , for the extraction of Mo, V, Ni, and Al from the refinery spent catalyst has been reported as a function of reagent concentration (0.5 to 2.0 molar), leaching time (1 to 6 h), and temperature (35 to 60°C). The optimal leaching conditions were achieved to obtain the maximum recovery of Mo, Ni, and V metals. The effect of the mixture of multi-ammonium salts on the metal extraction was also studied, which showed an adverse effect for Ni and V, while marginal improvement was observed for Mo leaching. The ammonium salts can form soluble metal complexes, in which stability or solubility depends on the nature of ammonium salt and the reaction conditions. The extracted metals and support can be reused to synthesize a fresh hydroprocessing catalyst. The process will reduce the refinery waste and recover the expensive metals. Therefore, the process is not only important from an environmental point of view but also vital from an economic perspective.
ISSN:1093-4529
1532-4117
DOI:10.1080/10934529.2018.1470802