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dc.contributor.authorLane, DJ
dc.contributor.authorHartikainen, A
dc.contributor.authorSippula, O
dc.contributor.authorLähde, A
dc.contributor.authorMesceriakovas, A
dc.contributor.authorPeräniemi, S
dc.contributor.authorJokiniemi, J
dc.date.accessioned2020-04-07T09:48:36Z
dc.date.available2020-04-07T09:48:36Z
dc.date.issued2020
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/8085
dc.description.abstractMunicipal solid waste incineration fly ashes can contain high concentrations of Zn and other valuable elements including Cu, Pb, Sn, and Sb. These elements can potentially be separated from fly ashes by selectively volatilising and condensing them in thermal processes. This study presents a thermal process for production of zinc concentrates from fly ashes and assesses the impact of the reducing gas atmosphere used in the process on the volatility of Zn, Pb, and Cu. Concentrates were produced by heating samples of municipal solid waste incineration fly ash in a reducing atmosphere, consisting of 10% H2 and 90% N2, and selectively condensing elements which volatilised from the ash at 900 and 1100 °C. Thermodynamic equilibrium calculations were used to predict the volatile behaviour of Zn, Pb, and Cu in the reducing atmosphere and in an oxidising atmosphere (air). The extent of volatilisation of these elements was also determined experimentally for both the reducing atmosphere and the oxidising atmosphere by means of mass balances based on elemental analyses of untreated and heat-treated ashes. The concentrate produced at 900 °C contained high concentrations of Zn (55.9 ± 12.5% w/w) and Pb (4.7 ± 1.1% w/w). These metals and other higher value elements, specifically, Sn, Sb, and Bi, were greatly enriched in the concentrates when compared with the untreated fly ash, showing a high potential for the developed process to separate multiple valuable elements from ashes. However, several deleterious impurities, particularly K, Na, and Cd, also reported to the concentrates in significant concentrations. Further refinements to the process are needed to separate these elements from Zn. The reducing gas atmosphere substantially increased the volatility of Zn, but suppressed the volatility of Cu and, to a lesser extent, the volatility of Pb. The equilibrium calculations overestimated the release of Cu in oxidising conditions and the release of Zn and Pb in both oxidising and reducing conditions.
dc.language.isoenglanti
dc.publisherElsevier BV
dc.relation.ispartofseriesJournal of cleaner production
dc.relation.urihttp://dx.doi.org/10.1016/j.jclepro.2020.120014
dc.rightsCC BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectfly ash
dc.subjectmunicipal solid waste
dc.subjectthermal treatment
dc.subjectzinc
dc.subjectmetal recovery
dc.subjectreducing gas
dc.titleThermal separation of zinc and other valuable elements from municipal solid waste incineration fly ash
dc.description.versionfinal draft
dc.contributor.departmentYmpäristö- ja biotieteiden laitos / Toiminta
dc.contributor.departmentSchool of Pharmacy, Activities
uef.solecris.id69075354en
dc.type.publicationTieteelliset aikakauslehtiartikkelit
dc.rights.accessrights© Elsevier Ltd
dc.relation.doi10.1016/j.jclepro.2020.120014
dc.description.reviewstatuspeerReviewed
dc.relation.articlenumber120014
dc.relation.issn0959-6526
dc.relation.volume253
dc.rights.accesslevelopenAccess
dc.type.okmA1
uef.solecris.openaccessEi


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