Recovery of Aluminum from Molybdenum Extraction Residue of Spent Hydrodesulfurization Catalyst
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Recovery of Aluminum from Molybdenum Extraction Residue of Spent Hydrodesulfurization Catalyst Changda Zhang1 · Sheng Huang1 · Bin Hu1 · Huaguang Wang2 · Mingyu Wang1 · Xuewen Wang1 Received: 18 February 2020 / Accepted: 26 July 2020 © The Minerals, Metals & Materials Society 2020
Abstract A large amount of molybdenum-bearing spent HDS catalysts are produced in the process of petroleum refining. After extraction of Mo from the spent HDS catalyst, a molybdenum extraction residue containing aluminum, nickel, and cobalt was obtained. In the work presented herein, extraction of aluminum from the molybdenum extraction residue by sodium hydroxide roasting followed by water leaching was investigated. The effects of sodium hydroxide roasting and water leaching on the extraction of aluminum as well as the kinetics of aluminum leaching were studied in detail. It was found that under the optimal conditions, the roasting of molybdenum extraction residue with 60 wt% sodium hydroxide addition at 800 °C for 2 h followed by water leached at 95 °C for 10 min with a liquid–solid ratio of 4 mL/g resulted in the leaching of aluminum up to 91.9%. Kinetics analysis showed that the aluminum leaching process was controlled by diffusion, and the leaching activation energy was determined to be 6.77 kJ/mol. Graphical Abstract
Keywords Molybdenum extraction residue · Aluminum · Leaching · Kinetics
Introduction The contributing editor for this article was T. Hirato Changda Zhang and Sheng Huang have contributed to the work equally and should be regarded as co-first authors. * Mingyu Wang [email protected] 1
School of Metallurgy and Environment, Central South University, Changsha 410083, China
Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI 49931, USA
2
Molybdenum-bearing hydrodesulfurization (HDS) catalysts are extensively used in the petroleum-refining industry. After the operation of hydrotreatment, a large amount of molybdenum-bearing spent HDS catalysts are produced [1–3]. Spent HDS catalyst is considered as a hazardous waste due to the presence of toxic elements [4]. Owing to the high value as well as high content, the recovery of molybdenum from molybdenum-bearing spent HDS catalysts gains more attention. In our previous study [5], a process of two-stage
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Vol.:(0123456789)
Journal of Sustainable Metallurgy
roasting followed by water leaching was proposed for the extraction of molybdenum. Blank roasting is carried out first, which can convert molybdenum sulfide to oxide, and then sodium carbonate roasting is used to convert molybdenum oxide to soluble sodium salt. The properties of alumina as carrier in catalyst are stable, and it is difficult to destroy its structure by sodium carbonate roasting, so selective sodium salinization of molybdenum can be realized. After water leaching, molybdenum extraction residue containing about 70 wt% A l2O3, 3.5 wt% Ni, and 0.3–0.4% Co was produced. In China, the process of high-temperature reductive smelting i
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