6
and is about 10% and the Co conversion is higher about
55% indicating a high selectivity of Urea to Co over Sm.
Also, the conversion for both Sm and Co increases with
increasing time. Rare earth metals react, but slowly, with
strong bases [15], and since Reline is a strong alkaline [28]
the low conversion of Sm in Urea can be attributed to it
Samarium (Sm) and Cobalt (Co) Conversion (%)from
SmCo Magnet Leaching in Reline Without RAM (WR)
and After RAM (AR) Intensification
From Figure 4 both Sm and Co conversions increased after
RAM intensification. The rate of dissolution of both Sm
and Co did not decrease after 30 minutes indicating that
the intensification time can be increased further to achieve
higher conversions. The increase in conversion after the
intensification can be attributed to the change in the inter-
facial hydrodynamic layer caused by the resonant vibration
of the RAM [35] thereby accelerating the mass transfer pro-
cess [35].
Samarium (Sm) and Cobalt (Co) Conversion (%)from
SmCo Magnet Leaching in Ethaline
Figure 5 shows the conversion of Samarium and Cobalt in
Ethaline. The Sm dissolution is relatively low with about
14% conversion as compared to the Co conversion of
about 24% after 2hrs
It can be seen from the result that Ethaline does not
show a high selectivity for either Co or Sm over each other
even though the conversion is not proportional for both Co
and Sm. It can also be seen that time significantly affects
the Sm and Co dissolution process. The difference between
the Co and Sm conversion is not huge as compared to the
results obtained for Oxaline and Reline. Ethaline is a weak
acid [36] and since cobalt dissolves slowly in a weak acid,
this could be a reason why the conversion of cobalt is lower
in Ethaline as compared to Oxaline which is a strong acid.
Samarium (Sm) and Cobalt (Co) Conversion (%)from
SmCo Magnet Leaching in EG-TBAC
Figure 6 compares the conversion of Sm and Co during the
leaching of the SmCo magnet in EG-TBAC. The results
Figure 2. Samarium (Sm) and Cobalt (Co) dissolution from
SmCo magnet leaching in Oxaline Without RAM (WR) and
After RAM (AR) Intensification
Figure 4. Samarium (Sm) and Cobalt (Co) dissolution from
SmCo magnet leaching in Reline Without RAM (WR) and
After RAM (AR) Intensification
Figure 3. Samarium (Sm) and Cobalt (Co) dissolution from
SmCo magnet leaching in Reline
and is about 10% and the Co conversion is higher about
55% indicating a high selectivity of Urea to Co over Sm.
Also, the conversion for both Sm and Co increases with
increasing time. Rare earth metals react, but slowly, with
strong bases [15], and since Reline is a strong alkaline [28]
the low conversion of Sm in Urea can be attributed to it
Samarium (Sm) and Cobalt (Co) Conversion (%)from
SmCo Magnet Leaching in Reline Without RAM (WR)
and After RAM (AR) Intensification
From Figure 4 both Sm and Co conversions increased after
RAM intensification. The rate of dissolution of both Sm
and Co did not decrease after 30 minutes indicating that
the intensification time can be increased further to achieve
higher conversions. The increase in conversion after the
intensification can be attributed to the change in the inter-
facial hydrodynamic layer caused by the resonant vibration
of the RAM [35] thereby accelerating the mass transfer pro-
cess [35].
Samarium (Sm) and Cobalt (Co) Conversion (%)from
SmCo Magnet Leaching in Ethaline
Figure 5 shows the conversion of Samarium and Cobalt in
Ethaline. The Sm dissolution is relatively low with about
14% conversion as compared to the Co conversion of
about 24% after 2hrs
It can be seen from the result that Ethaline does not
show a high selectivity for either Co or Sm over each other
even though the conversion is not proportional for both Co
and Sm. It can also be seen that time significantly affects
the Sm and Co dissolution process. The difference between
the Co and Sm conversion is not huge as compared to the
results obtained for Oxaline and Reline. Ethaline is a weak
acid [36] and since cobalt dissolves slowly in a weak acid,
this could be a reason why the conversion of cobalt is lower
in Ethaline as compared to Oxaline which is a strong acid.
Samarium (Sm) and Cobalt (Co) Conversion (%)from
SmCo Magnet Leaching in EG-TBAC
Figure 6 compares the conversion of Sm and Co during the
leaching of the SmCo magnet in EG-TBAC. The results
Figure 2. Samarium (Sm) and Cobalt (Co) dissolution from
SmCo magnet leaching in Oxaline Without RAM (WR) and
After RAM (AR) Intensification
Figure 4. Samarium (Sm) and Cobalt (Co) dissolution from
SmCo magnet leaching in Reline Without RAM (WR) and
After RAM (AR) Intensification
Figure 3. Samarium (Sm) and Cobalt (Co) dissolution from
SmCo magnet leaching in Reline