Vanadium sesquisulfide and its properties

Bukhanevich, V. F.; Radzikovskaya, S. V.

doi:10.1007/bf00775636

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Calcination Process1

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2012

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“…The calcination processes materials at temperatures up to 450˚C. The reactions available include removal of sulfur, carbon, and oxidizing of vanadium sulfide [9].…”

Section: Calcination Processmentioning

confidence: 99%

Chemical Treatment to Recover Molybdenum and Vanadium from Spent Heavy Gasoil Hydrodesulfurization Catalyst

Rojas-Rodríguez¹,

Flores-Fajardo²,

González³

et al. 2012

ACES

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Large quantities of spent hydrodesulfurization (HDS) catalysts are available from petrochemical industry. Disposal of spent catalyst is a problem as it falls under the category of hazardous industrial waste due to its vanadium concentration. Most of these catalysts are usually supported on alumina containing a variable percentage of elements such as nickel or molybdenum. Hence these catalysts contain environmentally critical, and economically valuable metals such as molybdenum, vanadium, and, nickel. In this paper, a spent HDS catalyst was treated with caustic soda solution. Parameters such as temperature, time, and NaOH solution concentration have been studied thoroughly, in order to settle the appropriate conditions for the maximum recovery of molybdenum and vanadium. Under the best leaching conditions (20% w NaOH, room temperature, 2 h) about 95% recovery of Mo and V was achieved, and the recovery of nickel obtained was of 99% in the form of NiAlO 4 .

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“…The calcination processes materials at temperatures up to 450˚C. The reactions available include removal of sulfur, carbon, and oxidizing of vanadium sulfide [9].…”

Section: Calcination Processmentioning

confidence: 99%