RT Journal Article
T1 Sequential separation of cobalt and lithium by sorption: Sorbent set selection
A1 Conte Erustes, Naby
A1 Gómez Martín, José María
A1 Díez Alcántara, Eduardo
A1 Sáez González, Patricia
A1 Monago García, José Ignacio
A1 Espinosa, Anna
A1 Rodríguez Rodríguez, Araceli
AB The sorption of cobalt and lithium was studied using low-cost natural (dolomite, diatomite, barite), commercial (13X zeolites and clinoptilolite) and synthesized (mesoporous carbon and NaY zeolite) sorbents. The pH of the medium was a key factor in the sorption process which can be modified due to the active chemical groups on the surface of the sorbents. Therefore, the doses of each sorbent were selected to avoid cobalt precipitation, working at pH below 8. Sorption with monometallic solution was carried out to select the best set of sorbents for subsequent selective separation. Only mesoporous activated carbon and dolomite allow to achieve significant cobalt removal, 85% and 65% respectively, with negligible lithium removal. 13X zeolite (high surface area and low Si/ Al molar ratio) removed both metals without selectivity. Therefore, dolomite and mesoporous activated carbon were selected for the selective separation of cobalt, as they allow to achieve an adsorbed Co2+/Li+ weight ratio of 16 and 4, respectively. 13X was selected to remove lithium once cobalt was removed from the solution. The best separation was carried out by a two-sequential sorption stage, using dolomite in a first stage to separate cobalt and 13X zeolite in a second stage to remove lithium, reaching an almost complete removal of both metals. The pH control for working with high doses of dolomite was achieved by means of a solid phase pH buffer (solid buffer) composed by a mixture of the dolomite itself and non-activated mesoporous carbon (without sorption capacity) in a 1:4 weight ratio. This solid buffer allowed the pH of the medium to be controlled to around 6.5.
PB Elsevier
SN 1383-5866
YR 2022
FD 2022-09-24
LK https://hdl.handle.net/20.500.14352/72099
UL https://hdl.handle.net/20.500.14352/72099
LA eng
NO CRUE-CSIC (Acuerdos Transformativos 2022)
NO Universidad Complutense de Madrid/Banco de Santander
NO Comunidad de Madrid
DS Docta Complutense
RD 30 abr 2024