Evaluation and comparison of pre-treatment techniques for recovering indium from discarded liquid crystal displays.
Waste Manag
; 87: 51-61, 2019 Mar 15.
Article
de En
| MEDLINE
| ID: mdl-31109551
ABSTRACT
Over the last years, emerging incentives for secondary production of high tech-metals, found in e-waste, are created because of their increasing demand and economic issues associated with their primary production. Due to the very low share of these metals in e-waste, pre-treatment methods can result in an output fraction rich in the metals of interest and may, therefore, be essential. To this scope, the present article evaluates and compares the efficiency of four different pre-treatment approaches containing various steps for recovering indium (In) from liquid crystal displays (LCDs) in laptop computers. The pre-treatment steps, used in various combinations, are (a) dry mechanical crushing and sieving, (b) pyrolysis, (c) thermal shock and (d) gravimetric process. Also, in all approaches, liquid crystals were removed from the samples, before applying the mechanical crushing step, as these are toxic and potentially harmful to human health and the environment. The removal was achieved by ultrasonic irradiation or mild agitation and optimized in terms of time, temperature and solvent type and concentration. Then, the feasibility of each pre-treatment approach was evaluated based on two parameters (a) the content of In in the resulting sample after pre-treatment and (b) the separated mass share (%) with larger indium content as compared to the original LCD panel. The results showed that In is highly liberated in the fractions consisting of finest particles (<25⯵m and <53⯵m) after dry mechanical crushing and sieving with a maximum content of 234â¯mg/kg, which is twice as much as in the raw material. However, these particles represented only about 14â¯wt% of the original LCD panel mass. On the contrary, thermal shock results indicated that this was the most efficient pre-treatment approach, as both the content of In and the separated LCD mass (%) remained in high levels. Finally, some economic aspects associated with the processes are presented.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Cristaux liquides
/
Déchets électroniques
Langue:
En
Journal:
Waste Manag
Sujet du journal:
SAUDE AMBIENTAL
/
TOXICOLOGIA
Année:
2019
Type de document:
Article
Pays d'affiliation:
Grèce