Leaching of copper and tin from used printed circuit boards after thermal treatment

Havlík, Tomáš; Oráč, Dušan; Petraniková, Martina; Miškufová, Andrea; Kukurugya, František; Takáčová, Zita

doi:10.1016/j.jhazmat.2010.07.107

Cited by 159 publications

(78 citation statements)

References 6 publications

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“…Many recycling techniques of copper from waste PCBs have been developed such as pyrometallurgy [6], hydrometallurgy [7][8][9], bioleaching [10,11] and mechanical process [4]. Recently, to obtain high purity products of copper from waste PCBs, many new processes were proposed such as leaching-electrowinning [12,13], mechanical separation-electrometallurgy [14], and vacuum metallurgy [15].…”

Section: Introductionmentioning

confidence: 99%

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Size-controlled preparation of Cu2O nanoparticles from waste printed circuit boards by supercritical water combined with electrokinetic process

Xiu

Zhang

2012

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

“…However, all of the above-mentioned processes can only recover metallic copper [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In our previous study [18], Cu 2 O/TiO 2 nanomaterials were prepared from waste PCBs by EK process.…”

Section: Introductionmentioning

confidence: 99%

Size-controlled preparation of Cu2O nanoparticles from waste printed circuit boards by supercritical water combined with electrokinetic process

Xiu

Zhang

2012

Journal of Hazardous Materials

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“…The organic matters in waste PCBs are mainly plastics. Organic matter weight of the initial PCBs was determined by the loss of ignition (LOI) at 550°C for 1 h (Havlik et al, 2010), and the weight percentage of organic matter in waste PCBs was 35.5%. In addition, the solid phase yield of SCWO-treated sample reached a steady level after 400°C and 60 min, while it needed higher temperature (420°C) for the SCWD-treated one.…”

Section: Effect Of Scwo and Scwd On Solid Phase Yieldmentioning

confidence: 99%

“…Hydrometallurgical processes with relatively low capital costs, no gas/dust formation, operational selectivity and suitability for small scale applications are propitious alternatives for the treatment of waste PCBs (Havlik et al, 2010;Pant et al, 2012;Tuncuk et al, 2012). In addition, many researchers have used various mechanical methods as pre-treatment to separate metals from PCBs, such as shape separation (Gungor and Gupta, 1998), jigging (Schmelzer and Wolf, 1996), density-based separation (Jirang and Forssberg, 2003), two-step crushing and corona electrostatic separation (Li et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Recovery of metals from waste printed circuit boards by supercritical water pre-treatment combined with acid leaching process

2013

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a b s t r a c tWaste printed circuit boards (PCBs) contain a large number of metals such as Cu, Sn, Pb, Cd, Cr, Zn, and Mn. In this work, an efficient and environmentally friendly process for metals recovery from waste PCBs by supercritical water (SCW) pre-treatment combined with acid leaching was developed. In the proposed process, waste PCBs were pre-treated by SCW, then the separated solid phase product with concentrated metals was subjected to an acid leaching process for metals recovery. The effect of SCW pre-treatment on the recovery of different metals from waste PCBs was investigated. Two methods of SCW pre-treatment were studied: supercritical water oxidation (SCWO) and supercritical water depolymerization (SCWD). Experimental results indicated that SCWO and SCWD pre-treatment had significant effect on the recovery of different metals. SCWO pre-treatment was highly efficient for enhancing the recovery of Cu and Pb, and the recovery efficiency increased significantly with increasing pre-treatment temperature. The recovery efficiency of Cu and Pb for SCWO pre-treatment at 420°C was 99.8% and 80%, respectively, whereas most of the Sn and Cr were immobilized in the residue. The recovery of all studied metals was enhanced by SCWD pre-treatment and increased along with pre-treatment temperature. Up to 90% of Sn, Zn, Cr, Cd, and Mn could be recovered for SCWD pre-treatment at 440°C.

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“…Currently, pyrometallurgical process [7,8] and hydrometallurgical process [9][10][11] are the two traditional approaches for the recovery of metals from waste PCBs. In addition, many researchers have used various mechanical methods as pre-treatment to separate metals from waste PCBs [2,5].…”

Section: Introductionmentioning

confidence: 99%

Co-treatment of waste printed circuit boards and polyvinyl chloride by subcritical water oxidation: Removal of brominated flame retardants and recovery of Cu and Pb

Xiu

Zhang

2014

Chemical Engineering Journal

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h i g h l i g h t sWe report an effective process for co-treatment of waste PCBs and PVC. Brominated flame retardants can be decomposed efficiently in co-treatment. Dechlorination of PVC was complete and safe. Cu and Pb in waste printed circuit boards can be recovered efficiently. Sn and Cr can be immobilized efficiently in the residue after co-treatment. t r a c tIn this work, an effective process for removal of brominated flame retardants (BFRs) and recovery of Cu and Pb from waste printed circuit boards (PCBs) was developed. In the process, waste PCBs and polyvinyl chloride (PVC) were co-treated by subcritical water oxidation (SBWO). PVC was used as a hydrochloric acid source and waste PCBs was used as a neutralizing reagent for the produced HCl. The dechlorination of PVC, removal of BFRs, and recovery of Cu and Pb could be achieved simultaneously by the one-step SBWO reaction. Experimental results showed that the dechlorination of PVC was complete when SBWO temperature exceeded 250°C. SBWO co-treatment was high efficient for the leaching of Cu and Pb from waste PCBs, and XRD spectra indicated that Sn was immobilized as SnO 2 in the residue after co-treatment. The optimum SBWO co-treatment conditions were temperature of 350°C, time of 60 min, solidliquid ratio of 1:9 g/ml, and PVC-to-PCBs ratio of 1:1, respectively. In the optimized co-treatment, 98.9% of Cu and 80% of Pb were recovered, while the leaching efficiencies of Sn and Cr were 15.3% and 3.9%, respectively. Meanwhile, approximately 100% of the bromine was changed into HBr and enriched in water after co-treatment.

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Leaching of copper and tin from used printed circuit boards after thermal treatment

Cited by 159 publications

References 6 publications

Size-controlled preparation of Cu2O nanoparticles from waste printed circuit boards by supercritical water combined with electrokinetic process

Size-controlled preparation of Cu2O nanoparticles from waste printed circuit boards by supercritical water combined with electrokinetic process

Recovery of metals from waste printed circuit boards by supercritical water pre-treatment combined with acid leaching process

Co-treatment of waste printed circuit boards and polyvinyl chloride by subcritical water oxidation: Removal of brominated flame retardants and recovery of Cu and Pb

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