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Recovery of yttrium from cathode ray tubes and lamps' fluorescent powders: Experimental results and economic simulation
- Publication Year :
- 2013
-
Abstract
- In this paper, yttrium recovery from fluorescent powder of lamps and cathode ray tubes (CRTs) is described. The process for treating these materials includes the following: (a) acid leaching, (b) purification of the leach liquors using sodium hydroxide and sodium sulfide, (c) precipitation of yttrium using oxalic acid, and (d) calcinations of oxalates for production of yttrium oxides. Experimental results have shown that process conditions necessary to purify the solutions and recover yttrium strongly depend on composition of the leach liquor, in other words, whether the powder comes from treatment of CRTs or lamp. In the optimal experimental conditions, the recoveries of yttrium oxide are about 95%, 55%, and 65% for CRT, lamps, and CRT/lamp mixture (called MIX) powders, respectively. The lower yields obtained during treatments of MIX and lamp powders are probably due to the co-precipitation of yttrium together with other metals contained in the lamps powder only. Yttrium loss can be reduced to minimum changing the experimental conditions with respect to the case of the CRT process. In any case, the purity of final products from CRT, lamps, and MIX is greater than 95%. Moreover, the possibility to treat simultaneously both CRT and lamp powders is very important and interesting from an industrial point of view since it could be possible to run a single plant treating fluorescent powder coming from two different electronic wastes.
- Subjects :
- Materials science
Coprecipitation
WEEE
Fluorescent lamps
Cathode ray tubes (CRTs)
Yttrium
Oxalic acid
Inorganic chemistry
Computer Simulation
Models, Economic
Cathode Ray Tube
Electronic Waste
Waste Management and Disposal
Oxide
chemistry.chemical_element
Economic
Sodium sulfide
law.invention
chemistry.chemical_compound
law
Models
Calcination
Metallurgy
chemistry
Sodium hydroxide
Leaching (metallurgy)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....680dfa46687dccb927717116ae624550