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dc.contributor.authorZhu, Mengyi
dc.contributor.authorYue, Shengying
dc.contributor.authorWu, Guixuan
dc.contributor.authorTang, Kai
dc.contributor.authorXu, Yijiang
dc.contributor.authorSafarian, Jafar
dc.date.accessioned2021-08-12T08:50:03Z
dc.date.available2021-08-12T08:50:03Z
dc.date.created2021-05-12T23:49:34Z
dc.date.issued2021
dc.identifier.issn1383-5866
dc.identifier.urihttps://hdl.handle.net/11250/2767498
dc.description.abstractPhosphorus (P) is a critical impurity in metallurgical-grade Si that needed to be removed for solar-grade Si production. The Si-Ca-Al-P system is one of the most crucial alloy systems for Si refining, where P can be separated by either the Si-Al solvent refining or the Si-Ca alloying-leaching process. In this work, a series of Si-Ca-Al alloys were obtained to investigate the role of alloy composition and the CaAl2Si2 phase in P segregation and separation. The used alumina crucible led to heavy Al contamination and resulted in unexpected Si-Ca-Al alloy compositions. CaAl2Si2 and CaSi2 were found as the main precipitates, and relatively higher P content was detected in the CaAl2Si2 phase. Leaching experiments indicate that P removal degree increases with increasing Ca/Al ratio and increasing total alloying amount (Ca + Al). Effects of alloy composition were further analyzed by statistical methods, which indicates Ca firmly plays a strong, positive, and monotonic role in P removal while no strong attraction between Al and P. Theoretical P removal model for the Si-Ca-Al system was established and in good agreement with measured results. Interaction coefficients of Ca and Al to P were fitted as εP_Ca = 19.2 and εP_Al = 1.8,which further confirms Ca is the essential driving force for P segregation. Finally, the possibility of P solid solution formation was verified by first-principle simulations that both CaAl2Si2 and CaSi2 are able to dissolve P, especially through the Si site, but the CaAl2Si2 phase is more favourable for P dissolution than CaSi2, which explains the reason of the often detected high P content in CaAl2Si2.en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.subjectThermodynamicsen_US
dc.subjectSolidificationen_US
dc.subjectSegregationen_US
dc.subjectPhosphorusImpurityen_US
dc.subjectSiliconen_US
dc.titleP removal from Si by Si-Ca-Al alloying-leaching refining: Effect of Al and the CaAl2Si2 phaseen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright: 2021 The Author(s). Published by Elsevier B.V. Ten_US
dc.source.volume271en_US
dc.source.journalSeparation and Purification Technologyen_US
dc.identifier.doi10.1016/j.seppur.2021.118675
dc.identifier.cristin1909833
dc.relation.projectNorges forskningsråd 257639en_US
dc.source.articlenumber118675en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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