Dissertation (PhD)--University of Stellenbosch, 2000. / ENGLISH ABSTRACT: Silver/Zinc batteries are extensively used for applications where a power source with
a high energy density is needed. A reactor was developed to manufacture the zinc
electrodes for these batteries. The parameters for the control of this reactor were
identified. The interaction and relationships between the set of parameters were
established and quantified. The novel design of the reactor includes features such as
continuous replenishment of the constituting chemicals, parallel flow of the plating
fluid, inert anodes and a serial electrical layout. The controlling parameters consist of
both chemical and physical parameters. They are - zincate concentration, hydroxyl
concentration, density, temperature, flow rate of the plating fluid, and current density.
The unique solubility characteristics of zinc oxide in potassium hydroxide lend
themselves to a novel approach for the determination of the zincate concentration in·
the plating solution. A set of conditions for the manufacturing of electrodes, with the
required characteristics, was identified. The requirements are densely packed zinc
dendrite morphology with high porosity and mechanical stability. The designed
reactor complies with the industries safety requirements. The batteries were
successfully applied in their operational domain (torpedoes) after this extensive
research project was completed. / AFRIKAANSE OPSOMMING: Silwer/Sink batterye word intensief aangewend in gebruike waar 'n kragbron met hoë
energie digtheid benodig word. 'n Reaktor is ontwikkel wat die sink elektrodes van
die tipes batterye vervaardig. Die veranderlikes vir die beheer van die reaktor is
bepaal. Die interaksie en verwantskap tussen die stel veranderlikes is verkry en
gekwantifiseer. Die unieke ontwerp van die reaktor het die volgende karakteristieke,
nl. aaneenlopende vervanging van die chemikalië verbruik, parallelle vloei van die
plateringsvloeistof, inerte anodes en elektriese uitleg in serie. Die chemiese en
fisiese veranderlikes is beide beherende veranderlikes. Hierdie fisiese en chemiese
veranderlikes wat die proses beheer is die sinkaat konsentrasie, hidroksiel
konsentrasie, digtheid, temperatuur, vloeitempo van die plateringsvloeistof en die
stroomdigtheid. Die unieke oplossingskarakteristieke van sinkoksied in kalsium·
hidroksied leen hom tot die unieke proses om die sinkaat konsentrasie in die
plateringsvloeistof te bepaal.
'n Steloperasionele kondisies vir die vervaardiging van die elektrodes met die
spesifieke spesifikasies soos verlang, is geïdentifiseer. Hierdie kondisies is die
diggepakte sinkdendriet morfologie met 'n hoë porositeit en meganiese stabiliteit. Die
ontwerpte reaktor voldoen aan die industriële veiligheidsvereistes en die
ergonomiese maatstawwe. Die batterye is suksesvol gebruik in hulle industriële
aanwending as gevolg van die suksesvolle afhandeling van die stuk navorsing.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/51958 |
| Date | 12 1900 |
| Creators | Holtzhausen, David Jacobus |
| Contributors | Lorenzen, L., Stellenbosch University. Faculty of Engineering. Dept. of Process Engineering. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | Unknown |
| Type | Thesis |
| Format | 114 p. : ill. |
| Rights | Stellenbosch University |
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