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Thermodynamic assessment of ZnO-SiO2 system
Aalto Univ, Sch Chem Technol, Dept Mat Sci & Engn, Thermodynam & Modelling Res Grp, POB 16200, FI-00076 Aalto, Finland..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China..
Aalto Univ, Sch Chem Technol, Dept Mat Sci & Engn, Thermodynam & Modelling Res Grp, POB 16200, FI-00076 Aalto, Finland..
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2018 (English)In: Transactions of Nonferrous Metals Society of China, ISSN 1003-6326, E-ISSN 2210-3384, Vol. 28, no 9, p. 1869-1877Article in journal (Refereed) Published
Abstract [en]

ZnO-containing slags are common in pyrometallurgical processing of the base metals and steel. This caused the interest to the thermodynamics of the ZnO-SiO2 system. A complete literature survey, critical evaluation of the available experimental data and a thermodynamic optimization of the phase equilibria and thermodynamic properties of the system ZnO-SiO2 at 1.013x10(5) Pa are presented. The molten oxide was described as an associate solution. The properties of liquid were reassessed and enthalpy term of the Gibbs energy of solid Zn2SiO4 was re-fitted to be compatible with the new data in the willemite primary phase field. The thermodynamic data set agrees well with the recent experimental observations. It can be used for predicting, e.g., the thermodynamic properties and the domains of the phase diagram, like critical point of the liquid miscibility gap, with a better accuracy than using the previous assessments. A set of optimized model parameters were obtained, reproducing the reliable thermodynamic and phase equilibrium data within their experimental errors from 298 K to liquidus temperatures, over the entire composition range. The created database can be used in a Gibbs energy minimization software to calculate the thermodynamic properties and the phase diagram sections of interest.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 28, no 9, p. 1869-1877
Keywords [en]
thermodynamic assessment, ZnO-SiO2 system, thermodynamic properties, phase diagram
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-237128DOI: 10.1016/S1003-6326(18)64832-0ISI: 000446870200021Scopus ID: 2-s2.0-85054441332OAI: oai:DiVA.org:kth-237128DiVA, id: diva2:1257971
Note

QC 20181023

Available from: 2018-10-23 Created: 2018-10-23 Last updated: 2020-03-09Bibliographically approved

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Zhang, Rui

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