Metal solubilization from powdered printed circuit boards by microbial consortium from bauxite and pyrite ores

Adhapure, Nitin; Waghmare, Shivaji S.; Hamde, V. S.; Deshmukh, A. M.

doi:10.1134/s0003683813030034

Cited by 20 publications

(12 citation statements)

References 17 publications

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“…This precipitate is composed of Sn, Cu, Pb and Fe 21 34 . The formation of such a metal-containing precipitate contaminates the PCB powder, and it is difficult to separate the precipitate from the residual PCB powder 21 35 . When using microorganisms for the recovery of metals from PCBs, one should also consider the toxicity of the metal ions because metal toxicity can inhibit the growth of microorganisms and thereby the rate and degree of the oxidation of ferrous iron, which can further affect the metal dissolution process 36 .…”

Section: Resultsmentioning

confidence: 99%

Hydrometallurgical Recovery of Metals from Large Printed Circuit Board Pieces

Jadhav

Hocheng

2015

Sci Rep

174

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The recovery of precious metals from waste printed circuit boards (PCBs) is an effective recycling process. This paper presents a promising hydrometallurgical process to recover precious metals from waste PCBs. To simplify the metal leaching process, large pieces of PCBs were used instead of a pulverized sample. The chemical coating present on the PCBs was removed by sodium hydroxide (NaOH) treatment prior to the hydrometallurgical treatment. Among the leaching reagents examined, hydrochloric acid (HCl) showed great potential for the recovery of metals. The HCl-mediated leaching of waste PCBs was investigated over a range of conditions. Increasing the acid concentration decreased the time required for complete metal recovery. The shaking speed showed a pronounced positive effect on metal recovery, but the temperature showed an insignificant effect. The results showed that 1 M HCl recovered all of the metals from 4 cm × 4 cm PCBs at room temperature and 150 rpm shaking speed in 22 h.

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Section: Resultsmentioning

confidence: 99%

Hydrometallurgical Recovery of Metals from Large Printed Circuit Board Pieces

Jadhav

Hocheng

2015

Sci Rep

174

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“…16 The precipitate formed during the bioleaching process is composed of Sn, Cu, Pb and Fe. 14,33,43,44 Occurrence of such precipitate makes it difficult to distinguish between the precipitate and residual PCB powder. 33,44 The formed precipitate contaminate the PCB powder and make the overall metal solubilisation process more complicated.…”

Section: Signicance Of the Present Studymentioning

confidence: 99%

“…14,33,43,44 Occurrence of such precipitate makes it difficult to distinguish between the precipitate and residual PCB powder. 33,44 The formed precipitate contaminate the PCB powder and make the overall metal solubilisation process more complicated. It also creates problems for the nal separation of non-metallic fraction of PCB sample and metal purication.…”

Section: Signicance Of the Present Studymentioning

confidence: 99%

Leaching of metals from printed circuit board powder by an Aspergillus niger culture supernatant and hydrogen peroxide

Jadhav

Hocheng

2016

RSC Adv.

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“…In the experiments of bioleaching of metals from pulverized PCBs, the precipitate formed during the process is composed of Sn, Cu, Pb and Fe [4,5]. Occurrence of such precipitate makes it difficult to distinguish between the precipitate and residual PCB powder [1]. It means the formed precipitate is contaminating the PCBs (pulverized) sample and making the overall metal recovery process more complicated.…”

Section: ‘Precipitate Contamination’ Problemmentioning

confidence: 99%