Extraction of metals from spent hydrotreating catalysts: Physico-mechanical pre-treatments and leaching stage

Ferella, Francesco; Ognyanova, A.; Michelis, Ida De; Taglieri, Giuliana; Vegliò, Francesco

doi:10.1016/j.jhazmat.2011.05.005

Cited by 17 publications

(14 citation statements)

References 26 publications

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“…These conditions allow recovering selectively Mo from the catalyst. This is consistent with the comments of Ferella et al [45] who reported the selective extraction of Mo and V from HDS catalysts using alkali leaching; partial leaching of alumina was reported while cobalt was segregated in the solid residue. Mo was dissolved through the reaction: Table 8).…”

Section: Effect Of Na 2 Co 3 /Nahco 3 Ratiosupporting

confidence: 93%

Metal valorization from the waste produced in the manufacturing of Co/Mo catalysts: leaching and selective precipitation

Hamza

Roux

Guibal

2018

J Mater Cycles Waste Manag

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Two different strategies have been designed for the acid and alkaline leaching steps of hydrodesulphurization catalysts. Tests have been performed on out-of-range catalysts issued from catalyst manufacturing process. Experimental conditions have been screened for these different processes considering the effects of concentration, temperature, solid/ liquid ratio, etc. The best conditions have been used for producing two leachates that were treated by precipitation for recovery of valuable metals such as cobalt and molybdenum. Post-treatments have also been designed for the selective separation of Co from Mo: X-ray diffraction analyses on selective precipitates (as sulfide) confirm the purity of produced materials. Two flow sheets are proposed that allow selectively recovering more than 95% of the valuable metals.

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Section: Effect Of Na 2 Co 3 /Nahco 3 Ratiosupporting

confidence: 93%

Metal valorization from the waste produced in the manufacturing of Co/Mo catalysts: leaching and selective precipitation

Hamza

Roux

Guibal

2018

J Mater Cycles Waste Manag

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“…Synthetic leach liquors were prepared with analytical‐grade chemicals and in particular NiSO 4 , VOSO 4 , MoO 3 , and Al 2 SO 4 (Merck and Sigma Aldrich). Solutions resembling leach liquor obtained by acid leaching and bioleaching were formulated as detailed in Table , according to methods reported in the literature .…”

Section: Methodsmentioning

confidence: 99%

“…Alternatively, acid leaching can be performed directly on exhausted HTC to extract all leachable metals (e.g., Mo, Ni, Co, V, and Al) in the liquor simultaneously . Bioleaching tests using Fe/S‐oxidizing bacteria have also been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Metal recovery from end‐of‐life hydrotreating catalysts by selective precipitation: Laboratory tests and preliminary process analysis

Cibati

Pagnanelli

Toro

2014

Env Prog and Sustain Energy

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Hydrotreating catalysts (HTCs) are a waste byproduct of the petroleum refining industry. The recovery of intrinsic and sorbed metals from spent catalysts is desirable for meeting environmental disposal regulations, as well as for the metal resell value. In this study, innovative process schemes for metal recovery from end-of-life (i.e., spent) HTCs were tested in laboratory experiments and compared by process analysis. Synthetic leach liquors containing Al, Mo, Ni, and V were prepared resembling both chemical leaching and bioleaching methods for metal extraction from spent catalysts. Subsequently, metals in the leach liquor were recovered individually according to two pH-dependent process schemes: (i) Mo and Ni were separated first and Al was removed last, and (ii) Al was removed first. The second metal separation process gave the best results in terms of selectivity, whereby 65% of Al was recovered by precipitation at pH 4.0, 87% of Mo was precipitated by sulfide addition at pH 0.5, 52% of Ni was precipitated by sulfide addition at pH 3.5, and 65% of V was recovered by hydroxide complexation at pH 6.0. Experimental data of metal precipitation were used to perform a process analysis comparing chemical leaching and bioleaching for different input flow rates and product depreciation in a simulated commercialscale plant. Simulation results indicate that chemical leaching is of superior performance over biological leaching in terms of metal recovery, which decrease the payback time for the capital investment to build the plant.

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“…Standard beneficiation technologies were also investigated in order to concentrate metals coming from spent HDS catalysts. Grain size separation, attrition and flotation were tested on spent Ni-Mo-Co-V catalyst: the results showed that it was not possible to achieve any concentration of those metals before the leaching stage (Ferella et al, 2011). Vitolo et al (2000) developed a three-stage process to recover vanadium from Orimulsion fly ash and heavy petroleum fly ash.…”

Section: Al-mansi and Abdel Monemmentioning

confidence: 99%

“…Summary of experimental studies carried out on spent hydrotreating catalysts for metal recovery (modified fromMarafi and Stanislaus, 2008a,b;Ferella et al, 2011).…”

mentioning

confidence: 99%

A review of metal recovery from spent petroleum catalysts and ash

et al. 2015

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Extraction of metals from spent hydrotreating catalysts: Physico-mechanical pre-treatments and leaching stage

Cited by 17 publications

References 26 publications

Metal valorization from the waste produced in the manufacturing of Co/Mo catalysts: leaching and selective precipitation

Metal valorization from the waste produced in the manufacturing of Co/Mo catalysts: leaching and selective precipitation

Metal recovery from end‐of‐life hydrotreating catalysts by selective precipitation: Laboratory tests and preliminary process analysis

A review of metal recovery from spent petroleum catalysts and ash

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