A comprehensive literature survey was conducted to
obtain the available information on the manganese electrodeposition
process.Using this information and measurments
obtained from an industrial electrowinning plant,a
modal was developed where the Interrelations between the
most important parameters ware taken into account.Fundamental
concepts were used wherever possible,except in
a small section where no theoretical data was available.
In this case empirical fitting of parameters was resorted
to.
The trends experienced in practice were all confirmed by
the mode1,namely$
(i) the increase of cathodic currant efficiency with
increased pH,which la limited by the precipitation of
manganese hydroxide t
(li) the increased current efficiency with decreased
ammonium sulphate concentration;
(ill) the existence of an optimum operating temperature
for a given current density;
(iv) the existence of an optimum current density for
a given temperature;
(v) the effect of total impurity level on current efficiency,
the latter decreasing with increasing impurity level
(vi) the steep increase of current efficiency with inorease
of feed flow rata,to an upper limit condition at
which point manganese hydroxide starts precipitating.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:wits/oai:wiredspace.wits.ac.za:10539/19221 |
| Date | January 2015 |
| Creators | Rodrigues, Jose Carlos Pereira |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | application/pdf, application/pdf |
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