Phase Equilibria in the CaO-SIO2-ZnO System in Air

Bonner, Stephen (2003). Phase Equilibria in the CaO-SIO2-ZnO System in Air Honours Thesis, School of Engineering, The University of Queensland.

       
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Author Bonner, Stephen
Thesis Title Phase Equilibria in the CaO-SIO2-ZnO System in Air
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2003
Thesis type Honours Thesis
Total pages 40
Language eng
Subjects 091405 Mining Engineering
Formatted abstract
The Imperial Smelting Process (ISP) is used extensively in primary and secondary production of lead and zinc, yet the process itself is not completely characterised. Thermodynamic modelling of complex slag systems relevant to the ISP has revealed inadequacies in experimental data used to optimise the mathematical models, particularly for slag systems containing ZnO. The focus of the present study is the determination of phase equilibria in the ZnO-CaO-SiO2 system in air to assess the validity of and, where necessary, to reinvestigate available data.

The experimental method employed involves high temperature equilibration and rapid quenching of synthetic slags, followed by Electron Probe Microanalysis (EPMA) to determine phase compositions. Experiments were carried out in the ZnO-SiO2 system in air, and were then extended into the ZnO-CaO-SiO2 system in air.

Phase diagrams of the two systems were constructed and significant deviation from currently accepted diagrams was noted. Further work is required to completely characterise the ZnO-CaO-SiO2 system in air. Results from this study will be incorporated into studies of the ZnO-“FeO”-SiO2-CaO-Al2O3-MgO system.
Keyword Phase Equilibria

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Mon, 12 Jan 2015, 15:02:15 EST by Asma Asrar Qureshi on behalf of Scholarly Communication and Digitisation Service