Printed circuit board recycling: Physical processing and copper extraction by selective leaching

Author(s)

Silvas, Flavia P. C. ^[1] ; Jimenez Correa, Monica M. ^[1] ; Caldas, Marcos P. K. ^{[1, 2]} ; de Moraes, Viviane T. ^[1] ; Espinosa, Denise C. R. ^[1] ; Tenorio, Jorge A. S. ^[1]

Affiliation

^[1] Univ Sao Paulo, Polytech Sch, Dept Chem Engn, BR-05424970 Sao Paulo - Brazil

^[2] Fed Inst Technol Sci & Educ Espirito Santo, BR-29173087 Serra, ES - Brazil

• Document type: Journal article
• Source: WASTE MANAGEMENT; v. 46, p. 503-510, DEC 2015.
• Web of Science Citations: 52

Abstract

Global generation of waste electrical and electronic equipment (WEEE) is about 40 million tons per year. Constant increase in WEEE generation added to international legislations has improved the development of processes for materials recovery and sustainability of electrical and electronic industry. This paper describes a new hydrometallurgical route (leaching process) to recycle printed circuit boards (PCBs) from printers to recover copper. Methodology included PCBs characterization and a combined route of physical and hydrometallurgical processing. Magnetic separation, acid digestion and chemical analysis by ICP-OES were performed. On leaching process were used two stages: the first one in a sulfuric media and the second in an oxidant media. The results showed that the PCBs composition was 74.6 wt.% of non-magnetic material and 25.4 wt.% of magnetic one. The metallic fraction corresponded to 44.0 wt.%, the polymeric to 28.5 wt.% and the ceramic to 27.5 wt.%. The main metal was copper and its initial content was 32.5 wt.%. On sulfuric leaching 90 wt.% of Al, 40 wt.% of Zn and 8.6 wt.% of Sn were extracted, whereas on oxidant leaching tests the extraction percentage of Cu was 100 wt.%, of Zn 60 wt.% and of Al 10 wt.%. At the end of the hydrometallurgical processing was obtained 100% of copper extraction and the recovery factor was 98.46%, which corresponds to a 32 kg of Cu in 100 kg of PCB. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 12/20350-3 - Separation and purification of metals from printed circuit board of discarded computers using solvent extraction
• Grantee: Monica Maria Jimenez Correa
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 12/51871-9 - Study Center for Technology in Waste Solid Treatment and Recycling - SCTWSTR
• Grantee: Jorge Alberto Soares Tenório
• Support Opportunities: Research Projects - Thematic Grants