Biolixiviação de cobre de sucata eletrônica

Yamane, Luciana Harue; Espinosa, Denise Crocce Romano; Tenório, Jorge Alberto Soares

doi:10.1590/s0370-44672011000300011

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…The printed circuit boards (PCB), units present in all types of electronic equipment, are present in the waste and have an extremely heterogeneous composition, generally containing plastic, ceramics, base metals and precious metals (Veit et al, 2008;Hall andWilliams, 2007 andYamane et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Leaching of gold and silver from printed circuit board of mobile phones

Petter

Veit

Bernardes

2015

Rem: Rev. Esc. Minas

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Nowadays there is a wide variety of models, sizes and configurations of mobile phones available for consumption. After the life cycle of this equipment, the recycling and reuse of the precious metals found in the printed circuit boards (PCB) of the mobile phones are principal objectives. Thus, the objective of this work was to characterize the gold and silver present in a PCB and develop a recycling route using alternative reagents for cyanide, such as sodium and ammonium thiosulfate. These reagents are less harmful to the environment and worker health. The first characterization of gold and silver was performed with aqua regia. The results show 86.26g Au/ton of PCBs and 123.85g Ag/ton of PCBs. The second characterization was performed with a commercial cyanide-based reagent and 112.02g Au/ton of PCBs and 26.13g Ag/ ton of PCBs were obtained. A leaching study with solutions based on thiosulfate was performed and an extraction of 9.02g Au/ton of PCBs and 33.88g Ag/ton of PCBs was obtained, compared to characterization results using a cyanide-based reagent.

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Section: Introductionmentioning

confidence: 99%

“…The metallic fraction contains various metals, such as copper (Cu), tin (Sn), zinc (Zn), nickel (Ni) and precious metals as gold (Au), silver (Ag) and palladium (Pd) (Yamane et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Leaching of gold and silver from printed circuit board of mobile phones

Petter

Veit

Bernardes

2015

Rem: Rev. Esc. Minas

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Non‐traditional atrazine degradation induced by zero‐valent‐copper: process optimization by the Doehlert experimental design, intermediates detection and toxicity assessment

Hollanda

Graça

Andrade

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND Over recent years, several studies exploring new technologies capable of degrading persistent organochlorine compounds have been published. Special attention has been dedicated to atrazine (ATZ), due to its ecotoxicological relevance together with its frequent detection in the environment. Degradation of organochlorines via zero‐valent metals has gained great importance given its practicality and versatility, zero‐valent‐iron (ZVI) being the most applied metal for this purpose. Alternatively, zero‐valent‐copper (ZVCu) was proved to exhibit higher reactivity against chlorinated aromatics, therefore deserving further investigation. RESULTS The optimum degradation conditions for ATZ removal with ZVCu were explored through a Doehlert experimental design. The same conditions were tested for the traditional ZVI, which confirmed that ZVCu was more reactive. The analysis of the degradation products suggests that both reductive and oxidative pathways coexist in the studied process. CONCLUSIONS ZVCu was effective in ATZ degradation, both by reductive and oxidation pathways, within a wide range of pH values, although faster in acidic media. The resulting solution from the experiment that promoted the fastest degradation is less toxic than ATZ against microalgae Chlorella vulgaris, which is a positive output regarding the application of this process as a pre‐treatment step of ATZ‐contaminated water matrices. © 2018 Society of Chemical Industry

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