Naslov
Cadmium removal from calcium sulphate suspension by liquid membrane extraction during recrystallization of calcium sulphate anhydrite

Autori
Kontrec, Jasminka ; Kralj, Damir ; Brečević, Ljerka

Izvornik
Colloids and Surfaces A : Physicochemical and Engineering Aspects (0927-7757) 223 (2003), 1-3; 239-249

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Liquid membrane extraction; Bulk liquid membrane; Cd2+ extraction; calcium sulphate anhydrite; calcium sulphate dihydrate

Sažetak
The removal of Cd2+ ions, incorporated in calcium sulphate anhydrite (AH), was performed by means of liquid membrane (LM) extraction. The LM extraction was performed during the process of solution-mediated transformation (recrystallization) of the cadmium-contaminated AH into the stable calcium sulphate dihydrate (DH). This transformation process involves the dissolution of AH and the crystal growth of DH. The extractants that transport Cd2+ selectively over Ca2+ ions (Alamine 304, tridodecylamine ; and Alamine 336, trioctylamine), diluted in the appropriate organic solvent (kerosene), were applied. Liquid membrane, designed in a form of the so-called bulk liquid membrane (BLM), was found to be the most suitable configuration for the treatment of calcium sulphate suspension. Cadmium ions were successfully removed from the feed suspension and no cadmium was found incorporated in the stable, DH, phase. The mechanism of Cd2+ transport through the membrane is proposed.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA