Deriving a rate equation for the removal of manganese from solution using a gas mixture of sulphur dioxide and oxygen

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dc.contributor.authorSchulze-Messing, Jacobusen_ZA
dc.date.accessioned2014-08-28T14:23:59Z
dc.date.available2014-08-28T14:23:59Z
dc.date.issued2005en_ZA
dc.description.abstractThe use of a sulfur dioxide - oxygen gas mixture to selectively remove manganese from other metals, such as cobalt and nickel, from leach solutions is kinetically favourable and inexpensive. However, this technology for precipitating manganese has not been used commercially, mainly due to a lack of understanding of the reaction mechanism by which the sulfur dioxide - oxygen gas mixture oxidises the manganese and the need to control the concentration of aqueous sulfur dioxide in the solution to ensure oxidising conditions. From the literature, the gas mixture is postulated to form a free radical in solution which in turn oxidises the manganese(lI) into the manganese(lIl) species, which can precipitate as manganese oxides (Mn02, Mn203, etc.). Due to the complicated and unknown reaction pathways for the oxidation of the manganese by the sulfur dioxide oxygen gas mixture, a need arose to describe the rate at which the manganese is precipitated from solution, not in terms of the exact species responsible for the oxidation, but rather as a function of the easily measurable operating parameters. From the literature, the operating parameters identified as playing a role in the rate of manganese precipitation are: the gas composition; the dissolved sulfur dioxide concentration; the dissolved oxygen concentration; the solution temperature, and the solution pH. To derive the relationship between the rate of manganese precipitation and each of the operating parameters, batch tests were conducted where one of the operating parameters was varied at a time. The dissolved sulfur species arising from the dissolution of the sulfur dioxide gas were not kept constant during the batch tests due to the high solubility of sulfur dioxide in water (the concentration of the dissolved sulfur species increased throughout all of the batch experiments). However, each of the operating parameters could be assessed as long as the concentration of the sulfur species in solution increased at the same rate for every test.en_ZA
dc.identifier.apacitationSchulze-Messing, J. (2005). <i>Deriving a rate equation for the removal of manganese from solution using a gas mixture of sulphur dioxide and oxygen</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering. Retrieved from http://hdl.handle.net/11427/6734en_ZA
dc.identifier.chicagocitationSchulze-Messing, Jacobus. <i>"Deriving a rate equation for the removal of manganese from solution using a gas mixture of sulphur dioxide and oxygen."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 2005. http://hdl.handle.net/11427/6734en_ZA
dc.identifier.citationSchulze-Messing, J. 2005. Deriving a rate equation for the removal of manganese from solution using a gas mixture of sulphur dioxide and oxygen. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Schulze-Messing, Jacobus AB - The use of a sulfur dioxide - oxygen gas mixture to selectively remove manganese from other metals, such as cobalt and nickel, from leach solutions is kinetically favourable and inexpensive. However, this technology for precipitating manganese has not been used commercially, mainly due to a lack of understanding of the reaction mechanism by which the sulfur dioxide - oxygen gas mixture oxidises the manganese and the need to control the concentration of aqueous sulfur dioxide in the solution to ensure oxidising conditions. From the literature, the gas mixture is postulated to form a free radical in solution which in turn oxidises the manganese(lI) into the manganese(lIl) species, which can precipitate as manganese oxides (Mn02, Mn203, etc.). Due to the complicated and unknown reaction pathways for the oxidation of the manganese by the sulfur dioxide oxygen gas mixture, a need arose to describe the rate at which the manganese is precipitated from solution, not in terms of the exact species responsible for the oxidation, but rather as a function of the easily measurable operating parameters. From the literature, the operating parameters identified as playing a role in the rate of manganese precipitation are: the gas composition; the dissolved sulfur dioxide concentration; the dissolved oxygen concentration; the solution temperature, and the solution pH. To derive the relationship between the rate of manganese precipitation and each of the operating parameters, batch tests were conducted where one of the operating parameters was varied at a time. The dissolved sulfur species arising from the dissolution of the sulfur dioxide gas were not kept constant during the batch tests due to the high solubility of sulfur dioxide in water (the concentration of the dissolved sulfur species increased throughout all of the batch experiments). However, each of the operating parameters could be assessed as long as the concentration of the sulfur species in solution increased at the same rate for every test. DA - 2005 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2005 T1 - Deriving a rate equation for the removal of manganese from solution using a gas mixture of sulphur dioxide and oxygen TI - Deriving a rate equation for the removal of manganese from solution using a gas mixture of sulphur dioxide and oxygen UR - http://hdl.handle.net/11427/6734 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/6734
dc.identifier.vancouvercitationSchulze-Messing J. Deriving a rate equation for the removal of manganese from solution using a gas mixture of sulphur dioxide and oxygen. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 2005 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/6734en_ZA
dc.language.isoeng
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.titleDeriving a rate equation for the removal of manganese from solution using a gas mixture of sulphur dioxide and oxygenen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMSc
uct.type.filetypeText
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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