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A mathematical model for the thermal regeneration of spent activated carbon
Thesis (M. Ing.) -- University of Stellenbosch, 1992.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867614095682830336 |
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| access_status_str | Open Access |
| author | Van der Westhuysen, Johannes Petrus Willem |
| author2 | van Devente, J. S. J. |
| author_browse | Van der Westhuysen, Johannes Petrus Willem van Devente, J. S. J. |
| author_facet | van Devente, J. S. J. Van der Westhuysen, Johannes Petrus Willem |
| author_sort | Van der Westhuysen, Johannes Petrus Willem |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M. Ing.) -- University of Stellenbosch, 1992. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/57775 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:46:35.680Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/57775 A mathematical model for the thermal regeneration of spent activated carbon Van der Westhuysen, Johannes Petrus Willem van Devente, J. S. J. Lorenzen, L. Stellenbosch University. Faculty of Engineering. Department of Process Engineering. Carbon, Activated -- Mathematical models Kilns, Rotary Dissertations -- Metallurgical engineering UCTD Thesis (M. Ing.) -- University of Stellenbosch, 1992. ENGLISH ABSTRACT: It is essential to have a mathematical model available for predicting and evaluating the performance of the regeneration of spent activated carbon in a rotary kiln. Real regeneration systems are, however extremely complex in nature. This thesis describes an approach to the modelling of the regeneration of spent activated carbon in a rotary kiln. A simulation model was developed to describe the energy transfer and the reaction kinetics in a rotary kiln. In this model, the kiln is divided into a number of axial length increments. The mass loss due to the heat transfer and reaction kinetics is calculated in each increment. The total mass loss is then the sum of the individual mass losses along the length of the kiln. Samplies of spent activated carbon were regenerated at different temperatures and the mass loss was recorded. The Freundlich-isotherm was used to correlate equilibrium adsorption data for the adsorption of gold cyanide on the regenerated carbon. The Freundlich A parameter was used to quantify the capacity of the regenerated carbon. The relationship between the mass loss during regeneration and the Freundlich A parameter was investigated. A maximum capacity was observed. The mass loss was used to evaluate rotary kiln performance. A simulation analysis was performed to investigated the influence of the operating conditions, the rotary kiln design parameters and the properties of the activated carbon on the capacity of the regenerated carbon. The influence of the capacity on the CIP circuit was further investigated and satisfactory agreement was obtained between the simulation results and experience within the industry. The wall temperature inside the kiln and the composition of the freeboard gas is critical to the performance of the kiln. Inefficient regeneration resulted in a loss of gold in the effluent of the CIP circuit and low gold loadings were also obtained. AFRIKAANSE OPSOMMING: Dit is noodsaaklik om 'n wiskundige model beskikbaar te hê vir die voorspelling en evaluering van die doeltreffendheid van die regenerasie van bevuilde koolstof in 'n draai-oond. Werklike regenerasie is egter baie kompleks. Hierdie tesis beskryf 'n benadering tot die modellering van die regenerasie van bevuilde koolstof in 'n draai-oond. 'n Simulasie model is ontwikkel om die energie oordragte en die reaksie kinetika in die oond te beskryf. In hierdie model word die oond in 'n aantal aksiale lengte inkremente verdeel. Die massaverlies as gevolg van die hitte oordrag en die reaksiekinetika word dan in elke inkrement bereken en oor die oond gesommeer om die totale massaverlies te bereken. Monsters bevuilde geaktiveerde koolstof is teen verskillende temperature geregenereer. Die massa verlies is by elke temperatuur bepaal. Die Freundlich adsorpsie-isoterm is vir elke monster met sy spesifieke massa verlies eksperimenteel bepaal. Goudsianied oplossings is hiervoor gebruik. Die Freundlich A veranderlike is as maatstaf van die kapasiteit van die geregenereede koolstof gebruik. Die verband tussen die A parameter en die massaverlies gedurende regenerasie is bepaal. Daar is bevind dat die kapasiteit 'n maksimum waarde bereik. Die massaverlies is vervolgens gebruik om die doeltreffendheid van die oond te evalueer. 'n Volledige simulasie analise is gedoen. Die invloed van veranderinge in die bedryfskondsies, ontwerpsveranderlikes en einskappe van die geaktiveerde koolstof op die kapasiteit van die koolstof is ondersoek. Vervolgens is die invloed van die kapasiteit van die geregenereerde koolstof op die koolstof-in-flodder aanleg ondersoek. Die resultate korreleer geed met dit wat op die aanleg ondervind word. Die wandtemperatuur en die samestelling van die gas is as kritiese parameters itentifiseer. Swak regenerasie verlaag die goud lading op die koolstof en verhoog die konsentrasie in die uitvloei. Masters 2012-08-27T11:38:39Z 2012-08-27T11:38:39Z 1992 Thesis http://hdl.handle.net/10019.1/57775 en_ZA Stellenbosch University 306 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Carbon, Activated -- Mathematical models Kilns, Rotary Dissertations -- Metallurgical engineering UCTD Van der Westhuysen, Johannes Petrus Willem A mathematical model for the thermal regeneration of spent activated carbon |
| title | A mathematical model for the thermal regeneration of spent activated carbon |
| title_full | A mathematical model for the thermal regeneration of spent activated carbon |
| title_fullStr | A mathematical model for the thermal regeneration of spent activated carbon |
| title_full_unstemmed | A mathematical model for the thermal regeneration of spent activated carbon |
| title_short | A mathematical model for the thermal regeneration of spent activated carbon |
| title_sort | mathematical model for the thermal regeneration of spent activated carbon |
| topic | Carbon, Activated -- Mathematical models Kilns, Rotary Dissertations -- Metallurgical engineering UCTD |
| url | http://hdl.handle.net/10019.1/57775 |
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