Effect of Particle Size on the Extraction of Metallic Components from Oxidized PCB in High Frequency Induction Furnace

Lee, Jae Chun; Jeong, Jin Ki; Kwon, Eui-Hyuk; Jang, Si‐Hyong; Han, Joung-Ho

doi:10.4028/www.scientific.net/msf.486-487.317

Cited by 3 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cui and Forssberg (2003) carried out a review of the mechanical recycling options for WEEE in which they discussed several options for the separation of small metal particles. The separation of metals after the oxidisation of the organic fraction of PCBs has also been reported (Lee et al , 2005).…”

Section: Resultsmentioning

confidence: 97%

Processing waste printed circuit boards for material recovery

Hall

Williams

2007

Circuit World

View full text Add to dashboard Cite

Classification: research paper ABSTRACT PurposeWe have investigated the use of pyrolysis for the processing of waste printed circuit boards (PCBs). The aim was to make the process of separating the organic, metallic, and glass fibre fractions of PCBs much easier and therefore make recycling of each PCB fraction more viable. Design/methodology/approach The PCBs were pyrolysed in a fixed bed reactor at 850°C. The organic fraction released by the boards was analysed by a variety of gas chromatography techniques. The residue that remained after pyrolysis was analysed by ICP-MS to determine the type of metals that were present. Findings When PCBs were heated to 800°C in an oxygen free atmosphere, the organic fraction decomposed to form volatile oils and gases leaving behind the metal and glass fibre fraction of the boards. The pyrolysed boards were very friable and the different fractions (metal components, copper power boards, glass fibre, etc) could be easily separated. The recovered metals could then be recycled by traditional routes with particular emphasis being placed on the recovery and recycling of rare and precious metals. The organic oils and gases which are produced during pyrolysis of PCBs can either be used as a chemical feedstock or as a fuel. Research limitations/implicationsThe research was only carried out on a very small scale so an investigation into scale-up must be performed. Practical implications By using pyrolysis, the organic and metallic fraction of printed circuit boards can be separated and recycled. Originality/value This paper presents a novel method for resource recovery from PCBs.

show abstract

Section: Resultsmentioning

confidence: 97%

Processing waste printed circuit boards for material recovery

Hall

Williams

2007

Circuit World

View full text Add to dashboard Cite

show abstract

“…Electronic scrap can be defined as a mixture of various metals mixed with various types of plastics and ceramics coming from printed circuits, integrated circuits, precious-metal edge connectors and a variety of polymeric materials. Valuable metals such as Cu, Sn etc., and small amount of precious metals like Au, Ag and Pd are frequently found in these complex mixtures, and therefore, the main economic driving force for the recycling of electronic scrap is the recovery of valuable metals [1][2][3][4]. In general, pyro-metallurgical processing includes incineration and smelting in a high temperature furnace.…”

Section: Introductionmentioning

confidence: 99%

Effect of Slag Compositions on the Extraction of Metallic Components from the Used PCB

Jang

Han

Jeong

et al. 2006

MSF

View full text Add to dashboard Cite

From materials view point, a PCB (Printed Circuit Board) is a simple mixture of various metals, plastics and oxides. Thus, it can be regarded as urbanized resources or ores. The existence of valuable metallic components in used PCB, then, becomes a major driving force for the recycling In this study, the effect of slag compositions on the extraction of valuable metallic components from the used PCB is investigated. Especially, a melting temperature of slag and slag viscosity are discussed as major operating parameters. PCB contains nearly 30wt% of SiO2 and 20wt% of Al2O3 as major oxides, and by just adding other flux components to used PCB, 20wt%Al2O3-Xwt%SiO2 - Ywt%CaO-10wt%MgO slag system with low melting point and low slag viscosity can be made to extract metallic components from used PCB by gravity separation. The slag basicity was changed under fixed compositions of Al2O3 and MgO. It was found that a proper melting temperature and slag basicity to make a homogeneous liquid slag and to extract metallic components from used PCB were 1573 K, and 0.75, respectively.

show abstract

Separation and recovery of materials from scrap printed circuit boards

Hall

Williams

2007

Resources, Conservation and Recycling

278

105

View full text Add to dashboard Cite

Printed circuit boards from waste computers, televisions, and mobile phones were pyrolysed in a fixed bed reactor with the aim of separating and recovering the organic and metallic materials. A selection of printed circuit boards from each of the three waste classes was pyrolysed at 800°C and the pyrolysis products were analysed using GC-FID, GC-TCD, GC-MS, GC-ECD, ICP-MS, and SEM-EDX. The pyrolysis oils contained high concentrations of phenol, 4-(1-methylethyl)phenol, and phydroxyphenol, as well as bisphenol A, tetrabromobisphenol A, methyl phenols, and bromophenols. The pyrolysis oils also contained significant concentrations of organo -phosphate compounds and a number of tetrabromobisphenol A pyrolysis products were also identified.The pyrolysis residues were very fragile and the organic, glass fibre, and metallic fractions could easily be separated and the electrical components could easily be removed from the remains of the printed circuit boards. The ash in the residue mainly consisted of copper, calcium, iron, nickel, zinc, and aluminium, as well as lower concentrations of valuable metals such as gallium, bismuth, silver, and gold, silver was present in particularly high concentrations. Many other metals were also identified in the ash by ICP-MS and SEM EDX. The pyrolysis gases mainly consisted of CO 2 and CO but all of the C 1 -C 4 alkanes and alkenes were present, as were some inorganic halogens.

show abstract

Effect of Particle Size on the Extraction of Metallic Components from Oxidized PCB in High Frequency Induction Furnace

Cited by 3 publications

References 2 publications

Processing waste printed circuit boards for material recovery

Processing waste printed circuit boards for material recovery

Effect of Slag Compositions on the Extraction of Metallic Components from the Used PCB

Separation and recovery of materials from scrap printed circuit boards

Contact Info

Product

Resources

About