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Quantitative equilibrium calculations on systems with relevance to copper smelting and converting
Umeå University, Faculty of Science and Technology, Department of Chemistry.
1984 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The present thesis gives a summary of results obtained through theoretical and experimental studies of systems with relevance to copper smelting and converting.

Many chemical elements are involved in the copper production pro­cesses and a detailed experimental study would be very time- consuming and expensive. A complicating fact is also the corrosivity of the liquid phases towards container material. A powerful alternative is equilibrium calculations, in which models for the liquid phases as well as reliable basic thermodynamic data are needed.

In the present thesis, a generalized structure based model for liquid silicates was developed and used in assessments of the sys­tems PbO-SiO2, Fe-O-SiO2, CuO0.5-SÌO2 and Cu-Fe-O-SiO2. In the model, the non-ideal silicate melt is treated as an ideal solu­tion but containing a few complexes. The PbO-Si02 melt could be described by introducing the complexes Pb3Si207, Pb4Si4010 and Pb13Si12O37 in addition to the components PbO and Pb2Si04. The species considered in the Fe-O-SiO2 melt were FeO, FeO1.5, Fe2Si04, Fe3Si207, Fe3Si6O15 and in the CUO0.5-SiO2 melt CuO0.5 ana CU4SiO4. Trie calculated phase diagrams, the activities of me­tal oxides and the oxygen partial pressures were all in good agreement with the published data.

Two of the papers in this thesis concern the determination of Gibbs free energies for Cu2S(s,l) and Ca2Fe2O5(s) through emf measurements utilizing a solid electrolyte. Activities and termi­nal solubilities in the solid solution [Fet,Ca]0 were also deter­mined.

The results obtained from the quantitative equilibrium calcula­tions for conventional copper smelting and converting were used to outline the overall reactions taking place and the outcome of changes in process parameters. Comparison with observed values, however, showed that the copper and magnetite contents in slag were calculated too low. These discrepancies could be completely explained by using a non-equilibrium approach in which the con­verter was assumed to consist of several segments with concentra­tion gradients between the segments.

Place, publisher, year, edition, pages
Umeå: Umeå universitet , 1984. , 77 p.
Keyword [en]
Assessment of silicate systems, model for liquid silicates, lead silicates, iron silicates, cuprous silicates, quantitative equi¬librium calculations, emf measurements, Gibbs free energy, cup¬rous sulphide, dicalcium ferrite, wüstite-calcia solid solution, copper smelting and converting
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-141286ISBN: 91-7174-167-4 OAI: oai:DiVA.org:umu-141286DiVA: diva2:1153033
Projects
digitalisering@umu.se
Available from: 2017-10-27 Created: 2017-10-27 Last updated: 2017-11-07Bibliographically approved

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