RT Journal Article
T1 Sustainable Management of Salt Slag
A1 Padilla, Isabel
A1 Romero, Maximina
A1 López De Andrés, María Sol
A1 López Delgado, Aurora
AB The management of salt slag, a waste from the secondary aluminum industry, is associated with huge environmental concerns due to the risk of atmospheric pollution (emission of toxic gases), groundwater contamination (high salt content that can percolate and cause an increase in salinity) and soil unavailability (large extensions required for disposal). Therefore, the development of a sustainable process for its treatment and recovery is of the utmost importance. In this work, a two-step process for the valorization of salt slag was developed that rendered zeolite as the main added-value product and NaCl and NH3 as byproducts. First, salt slag was hydrolyzed at 90 °C and at a solid/water ratio of 1/3. More than 90% of salt and ~90% of ammonia were recovered. In a second step, the hydrolyzed slag was completely transformed into a NaP zeolite under mild hydrothermal conditions. The zeolite exhibited specific surface area (17 m2 g−1), cation exchange capacity (2.12 meq g−1) and zeta potential (−52 mV) values that represent good characteristics for use in the removal of metal ions from aqueous effluents. The transformation of salt slag into zeolite can be considered a sustainable process with a high contribution to the circular economy.
PB MDPI
SN 2071-1050
YR 2022
FD 2022-04-19
LK https://hdl.handle.net/20.500.14352/71486
UL https://hdl.handle.net/20.500.14352/71486
LA eng
NO by Alusigma S.A.
DS Docta Complutense
RD 12 abr 2025