Precipitation of nickel and cobalt sulphides using different reactor configurations

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dc.contributor.authorSwartbooi, Ashton Marken_ZA
dc.date.accessioned2014-08-28T09:15:58Z
dc.date.available2014-08-28T09:15:58Z
dc.date.issued2005en_ZA
dc.description.abstractThe nickel reduction process produces a stream containing unreacted dissolved nickel and cobalt. Removal of these metals to optimum levels is desired, however, the product should also be easy to handle and the process easy to incorporate into the current system. There are various precipitation agents that can be used to remove metals from solution, these being hydroxide, carbonates or sulphides. Sulphide precipitation has been gaining increased attention because of the advantages it holds above the other methods. These include: - attainment of high degree of metal removal over a broad pH range; - effective removal of metals such as As, eu and Hg even at low pH; - low retention time required in the reaction tank because of high reactivity; - feasibility of selective metal recovery There are various methods of introducing the sulphide into the system as well, with a soluble sulphide source most commonly used. The problem with this, and coupled to the high reactivity of the sulphide ion, is the creation of high local supersaturation. The supersaturation governs all precipitation and crystallisation processes in the way that it features in nucleation and growth rates. In crystallisation processes, the supersaturation can easily be controlled by thermal methods of evaporation or cooling. However, in precipitation, the creation of supersaturation is by a reaction, which commonly leads to high supersaturation. Thus, to obtain a product that has good filterability and settling ability, methods for controlling the supersaturation in precipitation reactions needs to be investigated.en_ZA
dc.identifier.apacitationSwartbooi, A. M. (2005). <i>Precipitation of nickel and cobalt sulphides using different reactor configurations</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering. Retrieved from http://hdl.handle.net/11427/6696en_ZA
dc.identifier.chicagocitationSwartbooi, Ashton Mark. <i>"Precipitation of nickel and cobalt sulphides using different reactor configurations."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 2005. http://hdl.handle.net/11427/6696en_ZA
dc.identifier.citationSwartbooi, A. 2005. Precipitation of nickel and cobalt sulphides using different reactor configurations. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Swartbooi, Ashton Mark AB - The nickel reduction process produces a stream containing unreacted dissolved nickel and cobalt. Removal of these metals to optimum levels is desired, however, the product should also be easy to handle and the process easy to incorporate into the current system. There are various precipitation agents that can be used to remove metals from solution, these being hydroxide, carbonates or sulphides. Sulphide precipitation has been gaining increased attention because of the advantages it holds above the other methods. These include: - attainment of high degree of metal removal over a broad pH range; - effective removal of metals such as As, eu and Hg even at low pH; - low retention time required in the reaction tank because of high reactivity; - feasibility of selective metal recovery There are various methods of introducing the sulphide into the system as well, with a soluble sulphide source most commonly used. The problem with this, and coupled to the high reactivity of the sulphide ion, is the creation of high local supersaturation. The supersaturation governs all precipitation and crystallisation processes in the way that it features in nucleation and growth rates. In crystallisation processes, the supersaturation can easily be controlled by thermal methods of evaporation or cooling. However, in precipitation, the creation of supersaturation is by a reaction, which commonly leads to high supersaturation. Thus, to obtain a product that has good filterability and settling ability, methods for controlling the supersaturation in precipitation reactions needs to be investigated. DA - 2005 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2005 T1 - Precipitation of nickel and cobalt sulphides using different reactor configurations TI - Precipitation of nickel and cobalt sulphides using different reactor configurations UR - http://hdl.handle.net/11427/6696 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/6696
dc.identifier.vancouvercitationSwartbooi AM. Precipitation of nickel and cobalt sulphides using different reactor configurations. [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/11427/6696en_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.titlePrecipitation of nickel and cobalt sulphides using different reactor configurationsen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMSc
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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