Engineered strains enhance gold biorecovery from electronic scrap

Natarajan, Gayathri; Tay, Song Buck; Yew, Wen Shan; Ting, Yen‐Peng

doi:10.1016/j.mineng.2015.01.002

Cited by 31 publications

(13 citation statements)

References 20 publications

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“…Genetically engineered strains of Chromobacterium violaceum with enhanced cyanide production have been created and have been shown to boost the level of gold recovery from 11% to 30%. 110 A recent biomass adsorption process was developed for the recovery of gold and silver, along with base metals, from waste PCBs using a thiourea/sulfuric acid leachant, followed by selective adsorption on a low-cost and environmentally benign biomass gel prepared from leaf tannin. 111 This gel was found to be more efficient at recovering gold and silver from the leached PCBs than the traditional cementation processes, and the adsorbed metals, which were reduced to their metallic form, were easily recovered by incinerating the metal-loaded gel.…”

Section: Biohydrometallurgymentioning

confidence: 99%

Challenges and opportunities in the recovery of gold from electronic waste

et al. 2020

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Section: Biohydrometallurgymentioning

confidence: 99%

Challenges and opportunities in the recovery of gold from electronic waste

et al. 2020

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“…However, copper removal from E-waste with a high content of gold did not significantly effect gold recovery (Arshadi et al, 2016). Natarajan et al (2015) investigated the bioleaching process of gold from electronic scraps after treatment with 6 M HNO 3 . They used three strains, including a wild-type C. violaceum , and two metabolically engineered strains namely C. violaceum pbAD hcnABC and C. violaceum pTAC hcn ABC in their studies.…”

Section: Fundamentals Of Biohydrometallurgymentioning

confidence: 99%

“…Shabani et al (2013) studied the copper E-waste bioleaching by P. aeruginosa at particle sizes of <105, 105–150, 150–177, and >177 μm, and found that the particle size in the test range had no significant effect on the cell’s copper leaching performance. Natarajan et al (2015) investigated the pulp density (range 0.5–4 %w/v) effect in a gold bioleaching process from electronic scraps, and found that gold recovery decreased along with the scrap pulp density increasing. This was attributed to the decrease of cell viability owing to the electronic scrap materials toxicity and as well as higher cyanide complexations with other metals.…”

Section: Technical Considerations In Biohydrometallurgical Processesmentioning

confidence: 99%

Biohydrometallurgy as an environmentally friendly approach in metals recovery from electrical waste: A review

2020

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Nowadays, large amount of municipal solid waste is because of electrical scraps (i.e. waste electrical and electronic equipment) that contain large quantities of electrical conductive metals like copper and gold. Recovery of these metals decreases the environmental effects of waste electrical and electronic equipment (also called E-waste) disposal, and as a result, the extracted metals can be used for future industrial purposes. Several studies reported in this review, demonstrated that the biohydrometallurgical processes were successful in efficient extraction of metals from electrical and electronic wastes. The main advantages of biohydrometallurgy are lower operation cost, less energy input, skilled labour, and also less environmental effect in comparison with pyro-metallurgical and hydrometallurgical processes. This study concentrated on fundamentals and technical aspects of biohydrometallurgy. Some points of drawbacks and research directions to develop the process in the future are highlighted in brief.

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“…At present, the gold content in specific scrap materials like electronic waste can be 10-100 times higher than that available in many naturally-occurring ores [1,2]. In addition to gold, mobile phones, for example, contain ca.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Gold from Chloride Solution by TEMPO-Oxidized Cellulose Nanofiber Adsorbent

et al. 2019

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The goal of this study was to assess the sustainability of a modified cellulose nanofiber material for the recovery of precious gold from chloride solution, with a special focus on gold recovery from acidic solutions generated by cupric and ferric chloride leaching processes. TEMPO-oxidized cellulose nanofiber in hydrogel (TOCN), dry (H-TOCN, F-TOCN) and sheet form (S-TOCN) was examined for gold adsorptivity from chloride solution. Additionally, this work describes the optimum conditions and parameters for gold recovery. The data obtained in this investigation are also modeled using kinetic (pseudo first-order and pseudo second-order), isotherm best fit (Freundlich, Langmuir and Langmuir-Freundlich), and thermodynamic (endothermic process) parameters. Results demonstrate that high levels of gold removal can be achieved with TEMPO-oxidized cellulose nanofibers (98% by H-TOCNF) and the interaction characteristics of H-TOCN with gold suggests that other precious metals could also be efficiently recovered.

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Engineered strains enhance gold biorecovery from electronic scrap

Cited by 31 publications

References 20 publications

Challenges and opportunities in the recovery of gold from electronic waste

Challenges and opportunities in the recovery of gold from electronic waste

Biohydrometallurgy as an environmentally friendly approach in metals recovery from electrical waste: A review

Recovery of Gold from Chloride Solution by TEMPO-Oxidized Cellulose Nanofiber Adsorbent

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