Characterization of printed circuit boards for metal and energy recovery after milling and mechanical separation
ARTIGO
Inglês
Agradecimentos: The authors acknowledge the Brazilian research funding agency CNPq for their financial support of this work and Elisabete M.S. Sánchez for thermogravimetric analysis
The proper disposal of electrical and electronic waste is currently a concern of researchers and environmental managers not only because of the large volume of such waste generated, but also because of the heavy metals and toxic substances it contains. This study analyzed printed circuit boards...
The proper disposal of electrical and electronic waste is currently a concern of researchers and environmental managers not only because of the large volume of such waste generated, but also because of the heavy metals and toxic substances it contains. This study analyzed printed circuit boards (PCBs) from discarded computers to determine their metal content and characterized them as solid waste and fuel. The analysis showed that PCBs consist of approximately 26% metal, made up mainly of copper, lead, aluminum, iron and tin, as well as other heavy metals such as cadmium and nickel. Comparison with the results of other studies indicated that the concentration of precious metals (gold and silver) has declined over time. Analysis of the leachate revealed high concentrations of cadmium and lead, giving the residue the characteristics of hazardous waste. After milling the PCBs, we found that larger amounts of metal were concentrated in smaller fractions, while the lightest fraction, obtained by density separation, had a gross calorific value of approximately 11 MJ/kg, although with a high ash content. Milling followed by density separation proved potentially useful for recovery of metals and energy-rich fractions
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
Fechado
DOI: https://doi.org/10.3390/ma7064555
Texto completo: https://www.mdpi.com/1996-1944/7/6/4555
Characterization of printed circuit boards for metal and energy recovery after milling and mechanical separation
Characterization of printed circuit boards for metal and energy recovery after milling and mechanical separation
Fontes
Materials Vol. 7, no. 6 (June, 2014), p. 4555-4566 |