Experimental Determination of the Phase Equilibrium in the Cu-O-ZnO-SiO2-CaO-MgO System

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.advisorTaskinen, Pekka, Prof., Aalto University, Department of Materials Science and Engineering, Finland
dc.contributor.authorXia, Longgong
dc.contributor.departmentMateriaalitekniikan laitosfi
dc.contributor.departmentDepartment of Materials Science and Engineeringen
dc.contributor.labMetallurgical Thermodynamics and Modellingen
dc.contributor.labMetallurgisten prosessien termodynamiikka ja mallinnusfi
dc.contributor.schoolKemian tekniikan korkeakoulufi
dc.contributor.schoolSchool of Chemical Technologyen
dc.contributor.supervisorLiu, Zhihong, Prof., Central South University, P. R. China
dc.contributor.supervisorTaskinen, Pekka, Prof., Aalto University, Department of Materials Science and Engineering, Finland
dc.date.accessioned2016-11-21T10:01:32Z
dc.date.available2016-11-21T10:01:32Z
dc.date.dateaccepted2016-11-02
dc.date.defence2016-11-27
dc.date.issued2016
dc.description.abstractDue to the intensive consumption of high quality concentrates, copper smelters are increasing portions of multi-mineral ores and secondary scraps in their feeding materials. The smelting of complex materials is always accompanied by the formation of large amount of slag. Impurities in the feeding materials will be oxidized during the smelting process, and those oxides will form the slag phase together with fluxes. Certain amount of refractory materials will be eroded by molten phases, and then merge into the slag phase. The monitoring of slag compositions and properties has significant importance. Zinc is one of the major impurity elements in copper making, and it will be oxidized to zinc oxide (ZnO) in the smelting process. Zinc content in copper scraps, for example WEEE materials and waste brass, is also quite high, and it will also be oxidized and merge into the slag phase. Currently, ZnO content in copper smelting slags is increasing. However, the thermodynamic information about high ZnO content slag is still incomplete. The thermodynamic properties of the slag can be achieved by software calculation. But there are a lot of uncertainties in applying those extrapolated information into practice. Accurate experimental data are needed in the thermodynamic assessment of those less known systems.With the guidance of calculated phase diagrams by MTDATA 5.10 and its Mtox 8.1 database, the equilibration/quenching/SEM/EDS+EPMA technique has been successfully applied in investigating the phase relationship in the Cu-O-ZnO-SiO2-CaO-MgO system and its subsystems. Phase relationships in a wide temperature range (1000 °C – 1700 °C), and at various oxygen partial pressures (pO2 = 0.21 atm, pO2 = 0.01 atm, and in pure argon) have been systematically studied. Liquidus compositions and eutectic points in the ZnO-SiO2, ZnO-CaO, Cu-O-ZnO, Cu-O-SiO2, Cu-O-ZnO-SiO2, Cu-O-ZnO-CaO, and Cu-O-ZnO-MgO systems have been investigated. Sub-solidus lines in the ZnO-CaO, ZnO-MgO binaries have also been determined. The solubility behavior of copper oxide in the other terminal phases have been carefully checked as well. The best fitted phase diagrams have been compared with the resultsfrom the literature, and with the calculated phase diagrams from MTDATA 5.10 software and Mtox 8.1 database, and the differences are significant. The thermodynamic descriptions of those systems in the database should be updated, and the Cu-O-ZnO-SiO2-CaO-MgO system and its sub-systems need re-assessments. This study provides novel data for both scientific research and industrial practices.en
dc.format.extent146
dc.format.mimetypeapplication/pdfen
dc.identifier.isbn978-952-60-7148-0 (electronic)
dc.identifier.isbn978-952-60-7149-7 (printed)
dc.identifier.issn1799-4942 (electronic)
dc.identifier.issn1799-4934 (printed)
dc.identifier.issn1799-4934 (ISSN-L)
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/23515
dc.identifier.urnURN:ISBN:978-952-60-7148-0
dc.language.isoenen
dc.opnYang, Yongxiang, Prof., The Technology University of Delft, The Netherlands
dc.opnChai, Liyuan, Prof., Central South University, P.R.China
dc.opnWang, Wanlin, Prof., Central South University, P.R.China
dc.opnJokilaakso, Ari, Prof., Aalto University, Finland
dc.opnYang, Tianzu, Prof., Central South University, P.R.China
dc.publisherAalto Universityen
dc.publisherAalto-yliopistofi
dc.relation.haspart[Publication 1]: Xia, Longgong; Liu, Zhihong; Taskinen, Pekka Antero. 2015. Experimental determination of the liquidus temperatures of the binary (SiO2-ZnO) system in equilibrium with air. Elsevier. Journal of the European Ceramic Society, volume 35, issue 14, pages 4005-4010. ISSN: 0955-2219. DOI:10.1016/j.jeurceramsoc.2015.07.007
dc.relation.haspart[Publication 2]: Xia, Longgong; Liu, Zhihong; Taskinen, Pekka. 2016. Phase equilibrium study of the CaO-ZnO system. Wiley. Journal of the American Ceramic Society, volume 99, issue 11, pages 3809-3815. ISSN: 0002-7820. DOI:10.1111/jace.14405
dc.relation.haspart[Publication 3]: Xia, Longgong; Liu, Zhihong; Taskinen, Pekka. 2016. Solubility study of the halite and wurtzite solid solutions in the MgO-ZnO system within temperature range from 1000 to 1600 °C. Elsevier. Journal of Alloys and Compounds, volume 687, issue 5, pages 827-832. ISSN: 0925-8388. DOI:10.1016/j.jallcom.2016.06.191
dc.relation.haspart[Publication 4]: Xia, Longgong; Liu, Zhihong; Taskinen, Pekka Antero. 2016. Phase equilibria study of Cu-O-ZnO system in various oxygen partial pressures. Elsevier. Ceramics International, volume 42, issue 4, pages 5418-5426. ISSN: 0272-8842. DOI:10.1016/j.ceramint.2015.12.082
dc.relation.haspart[Publication 5]: Xia, Longgong; Liu, Zhihong; Taskinen, Pekka Antero. 2016. Equilibrium study of the Cu-O-SiO2 system at various oxygen partial pressures. Elsevier. Journal of Chemical Thermodynamics, volume 98, pages 126-134. ISSN: 0021-9614. DOI:10.1016/j.jct.2016.03.023
dc.relation.haspart[Publication 6]: Xia, Longgong; Liu, Zhihong; Taskinen, Pekka Antero. 2016. Experimental Determination of the Liquidus Surface of the Cu-O-CaO-ZnO system in equilibrium with air. Springer. Metallurgical and Materials Transaction B, volume47, issue 6. ISSN: 1073-5615. DOI:10.1007/s11663-016-0800-0
dc.relation.haspart[Publication 7]: Xia, Longgong; Liu, Zhihong; Taskinen, Pekka Antero. 2016. Experimental determination of the liquidus surface of the Cu-O-MgO-ZnO system in equilibrium with air, Copper 2016. Kobe, Japan, November. (Accepted, paper ID7283)
dc.relation.haspart[Publication 8]: Xia, Longgong; Liu, Zhihong; Taskinen, Pekka. 2016. Experimental determination of the liquid phase domain of the Cu-O-ZnO-SiO2 system in equilibrium with air. Taylor & Francis Group. Canadian Metallurgical Quarterly. ISSN: 0008-4433. DOI:10.1080/00084433.2016.1245944
dc.relation.ispartofseriesAalto University publication series DOCTORAL DISSERTATIONSen
dc.relation.ispartofseries243/2016
dc.revJak, Evgueni, Professor, University of Queensland, Australia
dc.revFabritius, Timo, Professor, University of Oulu, Finland
dc.revYang, Jian, Professor, Baosteel Group Corporation, China
dc.subject.keywordliquidusen
dc.subject.keywordsolidusen
dc.subject.keywordsub-solidusen
dc.subject.keywordphase diagramen
dc.subject.keywordthermodynamicen
dc.subject.keywordsmeltingen
dc.subject.keywordslagen
dc.subject.keywordpyrometallurgyen
dc.subject.otherMaterials scienceen
dc.subject.otherMetallurgyen
dc.titleExperimental Determination of the Phase Equilibrium in the Cu-O-ZnO-SiO2-CaO-MgO Systemen
dc.typeG5 Artikkeliväitöskirjafi
dc.type.dcmitypetexten
dc.type.ontasotDoctoral dissertation (article-based)en
dc.type.ontasotVäitöskirja (artikkeli)fi
local.aalto.archiveyes
local.aalto.formfolder2016_11_21_klo_11_21
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