Investigation on the status of rare earth elements contained in the powder of spent fluorescent lamps

2014 ◽  
Vol 591 ◽  
pp. 22-30 ◽  
Author(s):  
G. Belardi ◽  
N. Ippolito ◽  
L. Piga ◽  
M. Serracino
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Fluorescent Lamps ◽  
The Status

scholarly journals Production of Porous Ceramic Materials from Spent Fluorescent Lamps

2021 ◽  
Vol 11 (13) ◽  
pp. 6056
Author(s):  
Egle Rosson ◽  
Acacio Rincón Rincón Romero ◽  
Denis Badocco ◽  
Federico Zorzi ◽  
Paolo Sgarbossa ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
High Speed ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Fluorescent Lamps ◽  
Naoh Solution ◽  
Commercial Glass ◽  
Triton X

Spent fluorescent lamps (SFL) are classified as hazardous materials in the European Waste Catalogue, which includes residues from various hi-tech devices. The most common end-of-life treatment of SFL consists in the recovery of rare earth elements from the phosphor powders, with associated problems in the management of the glass residues, which are usually landfilled. This study involves the manufacturing of porous ceramics from both the coarse glass-rich fraction and the phosphor-enriched fraction of spent fluorescent lamps. These porous materials, realizing the immobilization of Rare Earth Elements (REEs) within a glass matrix, are suggested for application in buildings as thermal and acoustic insulators. The proposed process is characterized by: (i) alkaline activation (2.5 M or 1 M NaOH aqueous solution); (ii) pre-curing at 75 °C; (iii) the addition of a surfactant (Triton X-100) for foaming at high-speed stirring; (iv) curing at 45 °C; (v) viscous flow sintering at 700 °C. All the final porous ceramics present a limited metal leaching and, in particular, the coarse glass fraction activated with 2.5 M NaOH solution leads to materials comparable to commercial glass foams in terms of mechanical properties.

scholarly journals Processes and Technologies for the Recycling of Spent Fluorescent Lamps

2014 ◽  
Vol 16 (3) ◽  
pp. 80-85 ◽  
Author(s):  
Wojciech Kujawski ◽  
Beata Pospiech
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Industrial Application ◽  
New Technologies ◽  
Rare Earth Metals ◽  
Fluorescent Lamps ◽  
Potential Source ◽  
Efficient Recovery

Abstract The growing industrial application of rare earth metals led to great interest in the new technologies for the recycling and recovery of REEs from diverse sources. This work reviews the various methods for the recycling of spent fluorescent lamps. The spent fluorescent lamps are potential source of important rare earth elements (REEs) such as: yttrium, terbium, europium, lanthanum and cerium. The characteristics of REEs properties and construction of typical fl uorescent lamps is described. The work compares also current technologies which can be utilized for an efficient recovery of REEs from phosphors powders coming from spent fluorescent lamps. The work is especially focused on the hydrometallurgical and pyrometallurgical processes. It was concluded that hydrometallurgical processes are especially useful for the recovery of REEs from spent fluorescent lamps. Moreover, the methods used for recycling of REEs are identical or very similar to those utilized for the raw ores processing.

scholarly journals Selective Extraction of Red Phosphor (Y2O3:Eu3+) Constituents from Waste Fluorescent Lamps Phosphor Using Acid Leaching

2018 ◽  
Vol 15 (3) ◽  
Author(s):  
Parul Johar ◽  
Vishal Jangir ◽  
Yogita Choudhary ◽  
Sudhanshu Mallick
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Acid Leaching ◽  
Xrd Analysis ◽  
Selective Extraction ◽  
Phosphor Powder ◽  
Red Phosphor ◽  
Fluorescent Lamps ◽  
Refinement Method ◽  
Lamp Phosphor

Modern fluorescent lamp phosphor powder contains tricolor phosphor. This tricolor phosphor consists of three different types of rare earth phosphors: red (YOX), green (CMAT/LAP) and blue (BAM); mixed in varying proportions. The exact separation of these three rare earth phosphors is essential in order to precisely recover the contained rare earth elements from waste lamps phosphor. In this present work, we reported an efficient methodology for the separation of these three tricolor phosphors and the selective extraction of predominantly presented red phosphor (YOX) constituents using acid leaching. The waste phosphor powder was leached with different acids: both organic and inorganic type. The 3 M H2SO4 leaching was found to be most suitable for the selective extraction of red phosphor constituents, i.e. Y and Eu. The recovered phosphor powder was analyzed with SEM/EDS and XRD analysis. The obtained XRD pattern was refined using Rietveld refinement method for the quantification of phases present. Recovered red phosphor powder contained three main crystalline phases Y2O3, Eu2O3 and Y2OS2. KEYWORDS: Waste Lamp Phosphor; Tricolor Phosphor; Rare Earth Elements; Acid Leaching

Rare earth elements recovery from fluorescent lamps: A new thermal pretreatment to improve the efficiency of the hydrometallurgical process

2017 ◽  
Vol 153 ◽  
pp. 287-298 ◽  
Author(s):  
Nicolò Maria Ippolito ◽  
Valentina Innocenzi ◽  
Ida De Michelis ◽  
Franco Medici ◽  
Francesco Vegliò
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Hydrometallurgical Process ◽  
Thermal Pretreatment ◽  
Fluorescent Lamps

scholarly journals Study On The Separation And Extraction Of Rare-Earth Elements From The Phosphor Recovered From End Of Life Fluorescent Lamps

2015 ◽  
Vol 60 (2) ◽  
pp. 1257-1260 ◽  
Author(s):  
D.-W. Shin ◽  
J.G. Kim
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
End Of Life ◽  
Inductively Coupled Plasma ◽  
Rare Earth Oxide ◽  
Precipitation Reaction ◽  
Fluorescent Lamp ◽  
Inductively Coupled ◽  
Fluorescent Lamps ◽  
Heat Treated

Abstract In this study, recovered phosphor from end of life three-wavelength fluorescent lamp was selected for reuse rare earth elements in the phosphor. The effect of a type of acid, concentration, and time was investigated as solubility of rare earth elements. In addition, precipitate heat-treated was investigated as possibility of reusable phosphor. The results showed that the amount of the rare earth elements was different values depending on the type of acid, and it was investigated with concentration of acid and reaction time. After precipitation reaction, the precipitate was sintered in electric furnace in order to reuse rare earth elements as phosphor. It was confirmed that yttrium, europium, oxygen, and carbon through X-ray diffraction and inductively coupled plasma analysis. Following the results, it can assume that rare earth oxide reuse the phosphor as three-wavelength fluorescent lamp.

Identification of lanthanum-specific peptides for future recycling of rare earth elements from compact fluorescent lamps

2017 ◽  
Vol 114 (5) ◽  
pp. 1016-1024 ◽  
Author(s):  
Franziska L. Lederer ◽  
Susan B. Curtis ◽  
Stefanie Bachmann ◽  
W.Scott Dunbar ◽  
Ross T.A. MacGillivray
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Fluorescent Lamps ◽  
Compact Fluorescent Lamps
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