XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1731
(pH 2–8). Detailed experimental and solution chemistry
analyses showed that increasing gas flow rate, temperature,
and stirring rate resulted in enhanced Co-Mn recovery.
However, the increase was not significantly different for a
lower range of gas flow rate, stirring rate, and temperature
within a 95% confidence level. Our kinetic rate and activa-
tion energy results for the oxidative precipitation reaction
for the first 30 seconds (i.e., EaCo= 21.6kJ/mol &EaMn=
–13.9kJ/mol), and 30 minutes (i.e., EaCo= 27.3kJ/mol &
EaMn= 26.7kJ/mol) period of the reaction fit well with the
Pseudo-homogeneous model. The specific mechanism for
Co-Mn oxidative precipitation using ozone was not identi-
fied due to the complexity of the process and the interplay
of various phenomena involving the mass transfer of ozone,
co-precipitation and adsorption effects on precipitates of
elements, and competing reactions. However, the effect of
process parameters and calculated activation energy values
suggest that the oxidative precipitation of Co-Mn is primar-
ily a diffusion-controlled reaction. Future research in this
area would focus on understanding the interactive effect of
process parameters, and validating the scaleup parameters
of this method.
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