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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Recycling of WEEE: Characterization of spent printed circuit boards from mobile phones and computers

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Author(s):
Yamane, Luciana Harue [1] ; de Moraes, Viviane Tavares [1] ; Romano Espinosa, Denise Crocce [1] ; Soares Tenorio, Jorge Alberto [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Dept Met & Mat Engn, BR-05508030 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: WASTE MANAGEMENT; v. 31, n. 12, p. 2553-2558, DEC 2011.
Web of Science Citations: 160
Abstract

This paper presents a comparison between printed circuit boards from computers and mobile phones. Since printed circuits boards are becoming more complex and smaller, the amount of materials is constantly changing. The main objective of this work was to characterize spent printed circuit boards from computers and mobile phones applying mineral processing technique to separate the metal, ceramic, and polymer fractions. The processing was performed by comminution in a hammer mill, followed by particle size analysis, and by magnetic and electrostatic separation. Aqua regia leaching, loss-on-ignition and chemical analysis (inductively coupled plasma atomic emission spectroscopy ICP-OES) were carried Out to determine the composition of printed circuit boards and the metal rich fraction. The composition of the studied mobile phones printed circuit boards (PCB-MP) was 63 wt.% metals; 24 wt.% ceramics and 13 wt.% polymers; and of the printed circuit boards from studied personal computers (PCB-PC) was 45 wt.% metals; 27 wt.% polymers and ceramics 28 wt.% ceramics. The chemical analysis showed that copper concentration in printed circuit boards from personal computers was 20 wt.% and in printed circuit boards from mobile phones was 34.5 wt.%. According to the characteristics of each type of printed circuit board, the recovery of precious metals may be the main goal of the recycling process of printed circuit boards from personal computers and the recovery of copper should be the main goal of the recycling process of primed circuit boards from mobile phones. Hence, these printed circuit boards would not be mixed prior treatment. The results of this paper show that copper concentration is increasing in mobile phones and remaining constant in personal computers. (C) 2011 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 10/51009-0 - Gold recovery of printed circuit boards of obsolete computers by biohydrometallurgical process
Grantee:Jorge Alberto Soares Tenório
Support type: Regular Research Grants