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A simple, efficient and selective process for recycling La (and Al) from fluid cracking catalysts using an environmentally friendly strategy

2020-09Journal article Restricted access
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dc.contributor.authorSadeghi, S. Maryam
dc.contributor.authorJesus, João
dc.contributor.authorPinto, Edgar
dc.contributor.authorAlmeida, Agostinho A.
dc.contributor.authorSoares, Helena M. V. M.
dc.date.accessioned2021-04-08T09:46:39Z
dc.date.available2021-04-08T09:46:39Z
dc.date.issued2020-09
dc.description.abstractSpent fluid cracking catalyst (FCC) is an abundant waste material derived from oil refining processes and notably characterized by its content in rare earth metals, such as cerium (Ce) and lanthanum (La). In this work, it was our main aim to develop a simple but effective flowsheet, based on a single acid assisted leaching step followed by two consecutive precipitation steps, for recovering La with high purity from the FCCs. Firstly, three (conventional, ultrasound- and microwave-assisted) leaching strategies were tested using two acids (sulphuric acid, H2SO4, and hydrochloric acid, HCl). Microwave-assisted leaching was revealed to be the most efficient [(99.4 ± 0.9)% of La] and fastest leached (1 cycle of 90 s) strategy using a lower concentration of acid (1 M HCl) and low liquid-solid ratio (L/S = 5). Subsequently, a sequential selective alkaline and oxalate precipitation was capable of producing an aluminium hydroxide with 88.7% of purity by increasing the pH up to 6 and a highly pure (99.7%) salt of lanthanum oxalate (which can be calcinated into a reusable lanthanum oxide) using a reduced oxalate concentration. The proposed process is independent of the initial Al concentration present in the hydrochloric acid FCCs leachates and widely applicable (for [La] > 0.04 M, complete La precipitation can be achieved regardless of its initial concentration using a molar [oxalate]/[La] ratio of 2). Moreover, it is significantly simpler and faster than existing methods and minimizes the consumption of energy and reagents to a bare minimum, with accompanying cost reduction and environmental benefits.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationSadeghi, S. M., Jesus, J., Pinto, E., Almeida, A. A., & Soares, H. M. V. M. (2020). A simple, efficient and selective process for recycling La (and Al) from fluid cracking catalysts using an environmentally friendly strategy. Minerals Engineering, 156, 106375. https://doi.org/https://doi.org/10.1016/j.mineng.2020.106375pt_PT
dc.identifier.doi10.1016/j.mineng.2020.106375pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.22/17805
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/abs/pii/S0892687520301953pt_PT
dc.subjectFluid cracking catalystspt_PT
dc.subjectFlexible and universal processpt_PT
dc.subjectNearly closed processpt_PT
dc.subjectRecovery of Lapt_PT
dc.subjectRecovery of Alpt_PT
dc.titleA simple, efficient and selective process for recycling La (and Al) from fluid cracking catalysts using an environmentally friendly strategypt_PT
dc.typejournal article
dspace.entity.typePublication
person.familyNamePinto
person.givenNameEdgar
person.identifier.ciencia-id271F-B7DF-8FAB
person.identifier.orcid0000-0002-8021-4783
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationeaf9fc86-1a1c-437f-adee-d28040aa7f2f
relation.isAuthorOfPublication.latestForDiscoveryeaf9fc86-1a1c-437f-adee-d28040aa7f2f

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