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Separation of lepidolite from hard-rock pegmatite ore via dry processing and flotation

2022-09Journal article Open access
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dc.contributor.authorFilippov, Lev O.
dc.contributor.authorFilippova, Inna V.
dc.contributor.authorCrumiere, Gabriel
dc.contributor.authorSousa, Rui
dc.contributor.authorMachado Leite, Mário
dc.contributor.authorSousa, Ana Botelho de
dc.contributor.authorKorbel, Chloe
dc.contributor.authorTripathy, Sunil Kumar
dc.date.accessioned2022-10-21T11:01:27Z
dc.date.available2022-10-21T11:01:27Z
dc.date.issued2022-09
dc.description.abstractABSTRACT: A mineralogical study of Goncalo lithium-bearing mica-rich pegmatite ore (Portugal) indicated that lepidolite occurs in coarse-grained textures, which allows an appreciable liberation of gangue minerals (quartz, k-feldspar, and albite) from lepidolite. However, the intergrowth of these gangue minerals results in uncomplicated liberation (i.e., inclusions). Taking advantage of this coarse gangue liberation, optical ore sorting through image analysis was attempted in order to predict the grades of different-sized fractions using a random comminution algorithm. The ore-sorting process allowed the production of a marketable Li pre-concentrate product for metallurgy. Moreover, this method also highlighted the possible valuation of the reject as low-Li-content quartz-feldspar mixtures for the ceramic industry (reduction in the temperature of porosity closing). Furthermore, a scaled approach of grinding and sieving allowed the formation of a lepidolite-rich fraction (>210 mu m), which was processed using an electrostatic separator by varying key process parameters. The lepidolite and muscovite were separated to obtain a Li pre-concentrate assaying 3.5 % Li2O from a feed grade containing 1.8 % Li2O. Nevertheless, according to the zeta-potential measurements, the flotation test performed with the finer-sized fraction (-210 + 63 mu m) showed that lepidolite flotation was optimised between pH 3 and 5. In this pH range, concentrates from the rougher stage assayed 4.2-4.5 % Li2O, corresponding to 87-95 % Li recovery. At pH > 5, the selectivity decreases, and SiO2 analysis suggests the flotation of quartz and other silicates rather than lepidolite. Feldspar/quartz flotation was also tested using lepidolite flotation rejects to promote the separation of feldspars from quartz and obtain products for ceramic applications.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationFilippov, Lev O... [et.al.] - Separation of lepidolite from hard-rock pegmatite ore via dry processing and flotation. In: Minerals Engineering, 2022, vol. 187, article nº 107768pt_PT
dc.identifier.doi10.1016/j.mineng.2022.107768pt_PT
dc.identifier.issn0892-6875
dc.identifier.urihttp://hdl.handle.net/10400.9/3920
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationANR-10-LABX-21-0pt_PT
dc.relationFlexible and Mobile Economic Processing Technologies
dc.relationDesenvolvimento de uma ferramenta de análise de libertação a calibres grosseiros com base em texturas minerais macroscópicas
dc.relation.publisherversionhttps://doi.org/10.1016/j.mineng.2022.107768pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectMineral processingpt_PT
dc.subjectElectrostatic separationpt_PT
dc.subjectLepidolitept_PT
dc.subjectSorting technologiespt_PT
dc.subjectFroth flotationpt_PT
dc.subjectZero wastept_PT
dc.titleSeparation of lepidolite from hard-rock pegmatite ore via dry processing and flotationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleFlexible and Mobile Economic Processing Technologies
oaire.awardTitleDesenvolvimento de uma ferramenta de análise de libertação a calibres grosseiros com base em texturas minerais macroscópicas
oaire.awardURIinfo:eu-repo/grantAgreement/EC/H2020/641650/EU
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POR_NORTE/SFRH%2FBD%2F114764%2F2016/PT
oaire.citation.titleMinerals Engineeringpt_PT
oaire.citation.volume187pt_PT
oaire.fundingStreamH2020
oaire.fundingStreamPOR_NORTE
person.familyNameSousa
person.familyNameMachado Leite
person.givenNameRui
person.givenNameMário
person.identifier.ciencia-id2619-9AFE-58E1
person.identifier.orcid0000-0003-0992-1087
person.identifier.orcid0000-0002-5057-0605
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameEuropean Commission
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication7dc5e4a6-13bd-42bb-b476-03821641b38a
relation.isAuthorOfPublication34ce7bc7-77a8-48a6-8539-3220cc855272
relation.isAuthorOfPublication.latestForDiscovery34ce7bc7-77a8-48a6-8539-3220cc855272
relation.isProjectOfPublication5b32d2a3-3621-4cfc-b32c-4b1a36aa19f0
relation.isProjectOfPublication65697683-1704-4576-9a1b-aba9da346ea9
relation.isProjectOfPublication.latestForDiscovery5b32d2a3-3621-4cfc-b32c-4b1a36aa19f0

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