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Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags
Includes bibliographical references (leaves 60-65).
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2014
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| _version_ | 1867613302163505152 |
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| access_status_str | Open Access |
| author | Maidza, Teboho |
| author2 | Von Blottnitz, Harro |
| author_browse | Maidza, Teboho Von Blottnitz, Harro |
| author_facet | Von Blottnitz, Harro Maidza, Teboho |
| author_sort | Maidza, Teboho |
| collection | Thesis |
| description | Includes bibliographical references (leaves 60-65). |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/5294 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:59.204Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Department of Chemical Engineering |
| publisherStr | Department of Chemical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/5294 Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags Maidza, Teboho Von Blottnitz, Harro Chemical Engineering Includes bibliographical references (leaves 60-65). Slag arising from smelting in the production of ferrochrome alloys, stainless steel andPlatinum group metals (PGM) is known to contain residual chromium in variousphases within the slag matrix. Although the bulk of slag ends up on landfills, slag isused in the construction, agriculture and marine industry among others. Applicationsfor slag include as an aggregate in road construction and paving, buttressing, and as asource of lime in agriculture. Previous studies have shown that about 0.1-1 % of residual Cr(III) in slags with CaO/Si02 ratios greater than 2 can be slowly converted to a toxic and water-soluble hexavalent species in the presence of atmospheric oxygen, at ambient temperaturesalbeit at very slow rates. The produced Cr(VI) is potentially able to leach intounderground waterways and terrestrial water bodies, thus posing an environmentalhazard. In a landfill scenario, the oxidation kinetics are likely to be limited by the externaldiffusion resistance of the bulk of the landfill and the internal diffusion limitations tothe reactive phases within individual particles where CaO and Cr20 3 phases are inintimate contact. Earlier studies have also shown that the conversion of Cr(Ill) toCr(VI) in an ambient atmosphere increases, as the particle size decreases, with an increase in CaO and in the presence of moisture. 2014-07-31T11:07:34Z 2014-07-31T11:07:34Z 2006 Master Thesis Masters MSc http://hdl.handle.net/11427/5294 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Maidza, Teboho Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags |
| thesis_degree_str | Master's |
| title | Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags |
| title_full | Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags |
| title_fullStr | Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags |
| title_full_unstemmed | Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags |
| title_short | Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags |
| title_sort | development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual cr iii present in slags |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/5294 |
| work_keys_str_mv | AT maidzateboho developmentofarapidlaboratorypredictivetestmethodusingfluidisedbedtechniquesforthedeterminationofoxidisabilityofresidualcriiipresentinslags |