Back to Search
Start Over
Effect of mechanical activation on terbium dissolution from waste fluorescent powders
- Source :
- Minerals engineering 167 (2021). doi:10.1016/j.mineng.2021.106906, info:cnr-pdr/source/autori:Ippolito N.M.; Ferella F.; Innocenzi V.; Trapasso F.; Passeri D.; Belardi G.; Veglio F./titolo:Effect of mechanical activation on terbium dissolution from waste fluorescent powders/doi:10.1016%2Fj.mineng.2021.106906/rivista:Minerals engineering/anno:2021/pagina_da:/pagina_a:/intervallo_pagine:/volume:167
- Publication Year :
- 2021
- Publisher :
- Pergamon Press., New York, Regno Unito, 2021.
-
Abstract
- Rare earth elements (REEs), independently by the economic value, have a strategic importance and are involved, as critical materials, in the competition for their supply. An innovative process with the introduction of a preliminary physicochemical treatment was proposed. The mechanical activation of waste of fluorescent powders was performed by a vibratory disc mill at different experimental conditions to optimize the process. The mechanical forces induced to the powders cause crystal structure defects with a consequent increase of rare earths leachability. Factorial experimentations and analysis of variance were studied to determine the significant effects of the investigated factors (mechanical activation time, sulfuric acid concentration, pulp density and leaching temperature), especially for terbium dissolution. The preliminary activation allows to increase terbium dissolution of 35%. Then, according to the best conditions the subsequent operations of precipitation and calcination were performed obtaining a purity of 98.3% as rare earth oxides. Based on the experimental results, the flowsheet for rare earths recovery has been proposed and implemented by SuperPro Designer, a simulation software for process analysis and mass-energy balances. Finally, this paper reports a comparison between the present process with the mechanical pre-treatment and the alternative method based on thermal pre-treatment.
- Subjects :
- Materials science
Waste recycling
chemistry.chemical_element
Terbium
02 engineering and technology
010501 environmental sciences
01 natural sciences
020501 mining & metallurgy
law.invention
chemistry.chemical_compound
Mechanical activation
law
Rare earths
Calcination
Hydrometallurgical treatment
Dissolution
0105 earth and related environmental sciences
Precipitation (chemistry)
Fluorescent lamps
Mechanical Engineering
Metallurgy
Sulfuric acid
General Chemistry
Geotechnical Engineering and Engineering Geology
Disc mill
0205 materials engineering
chemistry
Leaching (chemistry)
Control and Systems Engineering
Scientific method
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Minerals engineering 167 (2021). doi:10.1016/j.mineng.2021.106906, info:cnr-pdr/source/autori:Ippolito N.M.; Ferella F.; Innocenzi V.; Trapasso F.; Passeri D.; Belardi G.; Veglio F./titolo:Effect of mechanical activation on terbium dissolution from waste fluorescent powders/doi:10.1016%2Fj.mineng.2021.106906/rivista:Minerals engineering/anno:2021/pagina_da:/pagina_a:/intervallo_pagine:/volume:167
- Accession number :
- edsair.doi.dedup.....a8fca292589e8c6f1be51b302a7b3532
- Full Text :
- https://doi.org/10.1016/j.mineng.2021.106906