Bioleaching of gold and copper from waste mobile phone PCBs by using a cyanogenic bacterium

Tran, Dinh Trinh; Lee, Jae-chun; Pandey, B.D.; Yoo, Kyoungkeun; Jeong, Jaeseung

doi:10.1016/j.mineng.2011.05.009

Cited by 145 publications

(67 citation statements)

References 6 publications

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“…Similar studies and observations were made by Tripathi et al (2012), Ha et al (2014), Petter et al (2014. Chi et al (2011) used a bioleaching process to extract gold and copper from waste mobile phone PCBs. The bioleaching was effected by using Chromobacterium violaceum (C. violaceum), a cyanide generating bacterium in a yeast-polypeptone with glycine medium.…”

Section: Precious Metal Recoverymentioning

confidence: 56%

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Mobile phone waste management and recycling: Views and trends

et al. 2015

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Section: Precious Metal Recoverymentioning

confidence: 56%

“…Authors Analytical techniques/methods Thiosulfate Leaching Chi et al (2011) Bio-leaching using Cyanogenic Bacterium Kim et al (2011) Hydrometallurgical Process Ha et al (2010) Thiosulfate Leaching Renping and Shimin (2005) Calcine Leaching…”

Section: Methodsmentioning

confidence: 99%

Mobile phone waste management and recycling: Views and trends

et al. 2015

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“…The leached metal concentration in aqua regia was analyzed via inductively coupled plasma-atomic emission spectroscopy (ICP-AES). [9][10][11][12][13]. Also, Brandl et al (2001) reported that bacteria such as Thiobacillus ferrooxidans and T. thiooxidans and fungi such as Aspergillus niger and Penicillium simplicissimum were able to mobilize high percentages of Cu, Sn, Al, Ni, Pb, and Zn particles from WEEE [13].…”

Section: Preparation Of the Metal Solution Using Aqua Regiamentioning

confidence: 99%

Metal Recovery from the Mobile Phone Waste by Chemical and Biological Treatments

2018

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Abstract:Recycling electronic waste is an important subject not only from the point of view of waste treatment, but also regarding the recovery of valuable metals. This research examined the stepwise recovery of metals in mobile phone waste using chemical treatment via pH swing and the biological method using biomineralization. In chemical treatment, the metal fraction attached to the printed circuit board (PCB) and camera parts were separated from the mobile phone waste and were then pulverized into particles with a size less than~2 mm. The metal fraction was dissolved in aqua regia, and the pH of the solution was increased to 10.5 by adding NH 4 OH. The first precipitate was iron oxide, produced by raising the pH to 3.1~4.2 with NH 4 OH. Sequentially, copper chloride and rare earth-metal complex were produced at pH 5.7~7.7 and 8.3~10.5, respectively. In the biological method, the filtrate at pH 7.7 was added to a metal-reducing bacteria growth medium as a precursor. After two weeks of incubation, rhodochrosite and calcite were precipitated as nano-sized minerals. The results indicate that effective metal recovery of mobile phone waste is feasible using chemical and biological treatments, and the recovered metals and rare earth metals can be recycled into raw materials for various industries.

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“…Relative to gold, preferential dissolution of copper could be due to high copper concentration which consumes free cyanide that would otherwise have been consumed by gold cyanide complexation [25]. Notably, gold (E 0 Au3+/Au : 1:52 V) is nobler than copper (E 0 Cu2+/Cu : 0.34 V) [28]. Gold could not be detected in uninoculated control during the whole period of bioleaching.…”

Section: Gold and Copper Bioleaching Profilesmentioning

confidence: 99%

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

A.N.Z.¹

2018

AJMR

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Technology of biorecovery by Bacillus megaterium to obtain gold as a complex of gold-cyanide from electronic waste material (EWM) was done. The bacteria were subjected to pretreatment and mutation. The exist metals in solution were dissolved via the pretreatment, that way, contest for the cyanide ion from other metals was reduced. The bacteria were subjected to mutation to be able grow at pH 9, 9.5 and 10, where the pKa of HCN is 9.3, thereby, the cyanide ion concentration available for bioleaching was increased by alkaline pH. The new mutated bacteria from the pretreated EWM at 0.5% pulp density obtained gold of 17, 25 and 21% at pH 9, 9.5 and 10, respectively. Whereas the old unmutated bacteria that grow at pH 7, recovered 11%. The outcomes demonstrated that effectiveness of the mutated alkaline bacteria (B. megaterium) in gold biorecovery was more than normal physiological (pH 7).

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Bioleaching of gold and copper from waste mobile phone PCBs by using a cyanogenic bacterium

Cited by 145 publications

References 6 publications

Mobile phone waste management and recycling: Views and trends

Mobile phone waste management and recycling: Views and trends

Metal Recovery from the Mobile Phone Waste by Chemical and Biological Treatments

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

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