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Interactions between freeze lining and slag bath in ilmenite smelting
Thesis (PhD (Metallurgical Engineering))--University of Pretoria, 2004.
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University of Pretoria
2013
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| _version_ | 1867613695167692800 |
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| access_status_str | Open Access |
| author2 | Pistorius, Petrus Christiaan |
| author_browse | Pistorius, Petrus Christiaan |
| author_facet | Pistorius, Petrus Christiaan |
| collection | Thesis |
| dc_rights_str_mv | © 2005 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Thesis (PhD (Metallurgical Engineering))--University of Pretoria, 2004. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/29230 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:40:13.972Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/29230 Interactions between freeze lining and slag bath in ilmenite smelting Pistorius, Petrus Christiaan johan.zietsman@ex-mente.co.za Zietsman, Johannes Hendrik Titania slag Slag bath Ilmenite smelting Process modelling Freeze lining Mathematical modelling Dc furnace Heat transfer UCTD Thesis (PhD (Metallurgical Engineering))--University of Pretoria, 2004. This study focused on the dynamic behaviour of the freeze lining and slag bath, and the interactions between these components in an ilmenite-smelting furnace process. The purpose of the work was to gain a better understanding of these issues and to ultimately contribute to an improved understanding of the ilmenite-smelting process in its entirety, and to future improvements in the design, operation and control of these processes. A mathematical model of the freeze lining and furnace sidewall was developed. This model was used in isolation for focused characterisation of the dynamic behaviour and interactions of the freeze lining and slag bath. The influences of net power input and slag composition were studied and various aspects of the freeze lining and slag bath were considered. These aspects included freeze lining thickness, temperature distribution through the freeze lining and furnace sidewall, composition distribution through the freeze lining, slag bath temperature and slag bath composition. The thermal response of thermocouples installed in the furnace sidewall to changing conditions on the inside of the furnace was also investigated. A mathematical model of the crust that forms on the slag bath surface was developed. This model was not used in isolation, and was only incorporated into a complete model of the process. A mathematical model of the entire ilmenite-smelting furnace process was constructed. This model incorporated the two models mentioned above and was able to describe the metal bath, slag bath, furnace atmosphere, freeze lining, furnace sidewall and the crust that is sometimes present on top of the slag bath. The model was used to study the influence of changes in operational parameters on the slag bath and freeze lining. The operational parameters that were studied included electrical power and reductant feed rate, both relative to ilmenite feed rate. The influence of severe operational errors and furnace down time were also investigated. Operational errors included loss of all feed while maintain electrical power input, and loss of reductant feed while maintaining power input and ilmenite feed. The above-mentioned studies were conducted by executing numerous experiments with two of the mathematical models. The experimental results were processed into sets of graphs displaying variations in the aspects that were considered. Many valuable insights resulted from the interpretation of these results. One specific aspect that formed part of the scope of this work was the origin of the compositional invariance of the slag close to the stoichiometric M3O5composition. This invariance was studied and a mechanism was proposed that explains the observed behaviour. The proposed mechanism created some questions about other mechanisms in the process. These mechanisms were also considered and elaborated on. The models and results produced in this study provide valuable insights into the behaviour of the ilmenite-smelting process. It also represents a useful foundation for future modelling work, and finally, it presents numerous opportunities for organisations operating ilmenite-smelting furnaces to improve their understanding and even the performance of their processes. Materials Science and Metallurgical Engineering unrestricted 2013-09-07T15:11:30Z 2004-11-05 2013-09-07T15:11:30Z 2004-04-30 2004 2004-11-05 Thesis Zietsman, JH 2004, Interactions between freeze lining and slag bath in ilmenite smelting, PhD thesis, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-11052004-112700 > http://hdl.handle.net/2263/29230 http://upetd.up.ac.za/thesis/available/etd-11052004-112700/ © 2005 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf University of Pretoria |
| spellingShingle | Titania slag Slag bath Ilmenite smelting Process modelling Freeze lining Mathematical modelling Dc furnace Heat transfer UCTD Interactions between freeze lining and slag bath in ilmenite smelting |
| title | Interactions between freeze lining and slag bath in ilmenite smelting |
| title_full | Interactions between freeze lining and slag bath in ilmenite smelting |
| title_fullStr | Interactions between freeze lining and slag bath in ilmenite smelting |
| title_full_unstemmed | Interactions between freeze lining and slag bath in ilmenite smelting |
| title_short | Interactions between freeze lining and slag bath in ilmenite smelting |
| title_sort | interactions between freeze lining and slag bath in ilmenite smelting |
| topic | Titania slag Slag bath Ilmenite smelting Process modelling Freeze lining Mathematical modelling Dc furnace Heat transfer UCTD |
| url | http://hdl.handle.net/2263/29230 http://upetd.up.ac.za/thesis/available/etd-11052004-112700/ |