Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags

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dc.contributor.advisorVon Blottnitz, Harroen_ZA
dc.contributor.authorMaidza, Tebohoen_ZA
dc.date.accessioned2014-07-31T11:07:34Z
dc.date.available2014-07-31T11:07:34Z
dc.date.issued2006en_ZA
dc.descriptionIncludes bibliographical references (leaves 60-65).
dc.description.abstractSlag 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.en_ZA
dc.identifier.apacitationMaidza, T. (2006). <i>Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering. Retrieved from http://hdl.handle.net/11427/5294en_ZA
dc.identifier.chicagocitationMaidza, Teboho. <i>"Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 2006. http://hdl.handle.net/11427/5294en_ZA
dc.identifier.citationMaidza, T. 2006. Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Maidza, Teboho AB - 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. DA - 2006 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2006 T1 - Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags TI - Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags UR - http://hdl.handle.net/11427/5294 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/5294
dc.identifier.vancouvercitationMaidza T. 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]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 2006 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/5294en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Chemical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherChemical Engineeringen_ZA
dc.titleDevelopment of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slagsen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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