Título: | CHARACTERIZATION OF PRINTED CIRCUIT BOARD OF MOBILE PHONES AIMING TO RECOVER VALUABLE METALS | |||||||
Autor: |
HELLINGTON BASTOS DA SILVA SANTANA |
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Colaborador(es): |
FRANCISCO JOSE MOURA - Orientador HUGO MARCELO VEIT - Coorientador |
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Catalogação: | 03/NOV/2021 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | |||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=55606&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=55606&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.55606 | |||||||
Resumo: | ||||||||
Nowadays the electronics industry is the leading sector in developing new
technologies. These new technologies lead to cheaper products increasing the
consumption. The lifetime of such products is relatively short and soon it becomes
waste, known as electronic waste. Cell phone is a common electronic
waste. This waste represents an interesting raw material, because it contains
large amount of base metals, considerable amount of valuable metals and also
those dangerous. In this work, the electronic waste was submitted to mechanical
processing: initially the devices were separated into two categories (less 2001,more
2002) and disassembled manually. The printed circuit boards were milled below 1
mm and then submitted to density and magnetic separation processes. The fractions
obtained during the mechanical processing were characterized by chemical
analysis. Using the mechanical processing was possible to obtain metal fractions
of 80 wt per cent. A preliminary study to recover silver using hydrometallurgical processes
was carried out. The concentrated material mechanically obtained was
leached with nitric acid. Then the silver was recovered from the leached solution
by cementation process. The silver cementation with copper was feasible; the
precipitate was rich in silver and leachate in copper. A leaching test was carried
out to determine if a waste needs to be managed as a hazardous; so that, cell
phone waste must be considered hazardous residue because the lead concentration
was above the limit established by Brazilian Standards.
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