Removal of mercury bonded in residual glass from spent fluorescent lamps.
J Environ Manage
; 115: 175-8, 2013 Jan 30.
Article
em En
| MEDLINE
| ID: mdl-23262405
ABSTRACT
The current technologies available for recycling fluorescent lamps do not completely remove the phosphor powder attached to the surface of the glass. Consequently, the glass contains the mercury diffused through the glass matrix and the mercury deposited in the phosphor powder that has not been removed during treatment at the recycling plant. A low-cost process, with just one stage, which can be used to remove the layer of phosphor powder attached to the surface of the glass and its mercury was studied. Several stirring tests were performed with different extraction mixtures, different liquid-solid ratios, and different agitation times. The value of the initial mercury concentration of the residual glass was 2.37 ± 0.50 µg/g. The maximum extraction percentage was 68.38%, obtained by stirring for 24 h with a liquid-solid ratio of 10 and using an extraction solution with 5% of an acid mixture prepared with HCl and HNO(3) at a ratio of 31 by volume. On an industrial scale the contact time could be reduced to 8 h without significantly lowering the percentage of mercury extracted. In fact, 64% of the mercury was extracted.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Iluminação
/
Fluorescência
/
Vidro
/
Utensílios Domésticos
/
Mercúrio
Idioma:
En
Revista:
J Environ Manage
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Espanha