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Characterization of the high temperature caustic conditioning process for optimized gold recovery from double refractory ores
Dissertation (MEng (Metallurgical Engineering))--University of Pretoria, 2020.
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| Format: | Thesis |
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University of Pretoria
2021
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| _version_ | 1867613683874529280 |
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| access_status_str | Open Access |
| author2 | Sandenbergh, R.F. |
| author_browse | Sandenbergh, R.F. |
| author_facet | Sandenbergh, R.F. |
| collection | Thesis |
| dc_rights_str_mv | © 2019 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 | Dissertation (MEng (Metallurgical Engineering))--University of Pretoria, 2020. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/78309 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:40:02.981Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| 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:2263/78309 Characterization of the high temperature caustic conditioning process for optimized gold recovery from double refractory ores Sandenbergh, R.F. ruan.pieterse87@gmail.com Pieterse, Petrus Johannes UCTD High-temperature caustic conditioning Gold recovery Caustic conditioning process Refractory gold ore processing Sustainable mining practices Engineering, built environment and information technology theses SDG-04 SDG-04: Quality education Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Engineering, built environment and information technology theses SDG-13 SDG-13: Climate action Engineering, built environment and information technology theses SDG-15 SDG-15: Life on land Dissertation (MEng (Metallurgical Engineering))--University of Pretoria, 2020. Preg-robbing gold ores reduce the gold recovered with conventional aqueous cyanide processing by adsorption of the leached gold onto the ore which is then lost to the residue. Many ore constituents adsorb gold in the form of aurodicyanide, with carbonaceous materials typically, and not unexpectedly, the most troublesome. This problem is addressed by adding the activated carbon used to recover the aurodicyanide earlier in the circuit to reduce the concentration of gold in solution available for adsorption on the preg-robbing carbon. Nonetheless, significant gold is still lost to preg-robbing carbon materials. Metso Outotec South Africa developed the HiTeCC (High-Temperature Caustic Conditioning) process through which some of the preg-robbed gold may be recovered. This process entails desorbing gold under high-temperature caustic conditions and then competitively adsorbing the gold onto fresh activated carbon. The success achieved to date with the HiTeCC process to recover gold suggests that preg-robbing is reversible under HiTeCC conditions. Developmental work has shown that not all preg-robbing ores are equally amenable to the process and the respective roles played by the caustic addition, temperature, and the activity and quantity of activated carbon are, not well understood. The aim with the present investigation was to resolve these issues by applying existing models for the adsorption and desorption of aurodicyanide on activated carbon and preg-robbing materials to the HiTeCC process. A simulation program was developed to support the evaluation of the potential and application of the HiTeCC process to extract additional gold from double refractory ores. As a result of this, the use of experimentally determined preg-robber sorption isotherms to predict preg-robbing behaviour has been demonstrated. The behaviour of preg-robbing adsorption has further been defined by comparing preg-robbing isotherms at varying temperature and adsorbate compositions. mi2025 Materials Science and Metallurgical Engineering MEng (Metallurgical Engineering) Unrestricted SDG-04: Quality education SDG-09: Industry, innovation and infrastructure SDG-12: Responsible consumption and production SDG-13: Climate action SDG-15: Life on land 2021-02-08T11:04:59Z 2021-02-08T11:04:59Z 2021 2020 Dissertation * A2021 http://hdl.handle.net/2263/78309 en © 2019 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 University of Pretoria |
| spellingShingle | UCTD High-temperature caustic conditioning Gold recovery Caustic conditioning process Refractory gold ore processing Sustainable mining practices Engineering, built environment and information technology theses SDG-04 SDG-04: Quality education Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Engineering, built environment and information technology theses SDG-13 SDG-13: Climate action Engineering, built environment and information technology theses SDG-15 SDG-15: Life on land Characterization of the high temperature caustic conditioning process for optimized gold recovery from double refractory ores |
| title | Characterization of the high temperature caustic conditioning process for optimized gold recovery from double refractory ores |
| title_full | Characterization of the high temperature caustic conditioning process for optimized gold recovery from double refractory ores |
| title_fullStr | Characterization of the high temperature caustic conditioning process for optimized gold recovery from double refractory ores |
| title_full_unstemmed | Characterization of the high temperature caustic conditioning process for optimized gold recovery from double refractory ores |
| title_short | Characterization of the high temperature caustic conditioning process for optimized gold recovery from double refractory ores |
| title_sort | characterization of the high temperature caustic conditioning process for optimized gold recovery from double refractory ores |
| topic | UCTD High-temperature caustic conditioning Gold recovery Caustic conditioning process Refractory gold ore processing Sustainable mining practices Engineering, built environment and information technology theses SDG-04 SDG-04: Quality education Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Engineering, built environment and information technology theses SDG-13 SDG-13: Climate action Engineering, built environment and information technology theses SDG-15 SDG-15: Life on land |
| url | http://hdl.handle.net/2263/78309 |