INVESTIGADORES
ESQUIVEL Marcelo Ricardo Oscar
congresos y reuniones científicas
Título:
Extraction of samarium as a chloride or oxychloride from a Sm2O3-CeO2 mixture
Autor/es:
M:R. ESQUIVEL; A. BOHE; D. PASQUEVICH
Lugar:
Madrid - España
Reunión:
Conferencia; REWAS 2004 - Symposium on Recycling, Waste Treatment and Clean Technology; 2004
Institución organizadora:
INASMET - TMS
Resumen:
Samarium is one of the most difficult metals to be obtained. Its extraction from lanthanide oxide
mixtures is frequently hindered because of the chemical similarities and both high thermodynamic
and thermal stabilities of these compounds.
Chlorination using Cl2(g) or Cl2(g) + C(s) offers the possibility of separate Sm as SmCl3 or
SmOCl as products. The separation process is enhanced if operation parameters such as
temperature and carbon content are optimized.
A Sm2O3 (50wt%)-CeO2 (50wt%) mixture was chlorinated with Cl2(g) and Cl2(g) + C(s) at
temperatures between 400 and 950ºC by thermogravimetry and the results were compared to
those obtained from previous studies of the individual CeO2-Cl2, CeO2-C-Cl2, Sm2O3-Cl2 and
Sm2O3-Cl2-C systems. Reactants and products were analyzed by X-ray diffraction (XRD),
scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).
An optimum of the separation process involving the carbochlorination is obtained at 700ºC and
for carbon contents higher than 10 %wt in the CeO2(45 wt%s)-Sm2O3(45 wt%)-C(10 wt%)
mixture where Sm is separated as SmCl3 from the Sm2O3CeO2 mixture.2(g) or Cl2(g) + C(s) offers the possibility of separate Sm as SmCl3 or
SmOCl as products. The separation process is enhanced if operation parameters such as
temperature and carbon content are optimized.
A Sm2O3 (50wt%)-CeO2 (50wt%) mixture was chlorinated with Cl2(g) and Cl2(g) + C(s) at
temperatures between 400 and 950ºC by thermogravimetry and the results were compared to
those obtained from previous studies of the individual CeO2-Cl2, CeO2-C-Cl2, Sm2O3-Cl2 and
Sm2O3-Cl2-C systems. Reactants and products were analyzed by X-ray diffraction (XRD),
scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).
An optimum of the separation process involving the carbochlorination is obtained at 700ºC and
for carbon contents higher than 10 %wt in the CeO2(45 wt%s)-Sm2O3(45 wt%)-C(10 wt%)
mixture where Sm is separated as SmCl3 from the Sm2O3CeO2 mixture.2O3 (50wt%)-CeO2 (50wt%) mixture was chlorinated with Cl2(g) and Cl2(g) + C(s) at
temperatures between 400 and 950ºC by thermogravimetry and the results were compared to
those obtained from previous studies of the individual CeO2-Cl2, CeO2-C-Cl2, Sm2O3-Cl2 and
Sm2O3-Cl2-C systems. Reactants and products were analyzed by X-ray diffraction (XRD),
scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).
An optimum of the separation process involving the carbochlorination is obtained at 700ºC and
for carbon contents higher than 10 %wt in the CeO2(45 wt%s)-Sm2O3(45 wt%)-C(10 wt%)
mixture where Sm is separated as SmCl3 from the Sm2O3CeO2 mixture.2-Cl2, CeO2-C-Cl2, Sm2O3-Cl2 and
Sm2O3-Cl2-C systems. Reactants and products were analyzed by X-ray diffraction (XRD),
scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).
An optimum of the separation process involving the carbochlorination is obtained at 700ºC and
for carbon contents higher than 10 %wt in the CeO2(45 wt%s)-Sm2O3(45 wt%)-C(10 wt%)
mixture where Sm is separated as SmCl3 from the Sm2O3CeO2 mixture.2O3-Cl2-C systems. Reactants and products were analyzed by X-ray diffraction (XRD),
scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).
An optimum of the separation process involving the carbochlorination is obtained at 700ºC and
for carbon contents higher than 10 %wt in the CeO2(45 wt%s)-Sm2O3(45 wt%)-C(10 wt%)
mixture where Sm is separated as SmCl3 from the Sm2O3CeO2 mixture.2(45 wt%s)-Sm2O3(45 wt%)-C(10 wt%)
mixture where Sm is separated as SmCl3 from the Sm2O3CeO2 mixture.3 from the Sm2O3CeO2 mixture.