Leaching of Metals from Waste Silver Oxide-Zinc Button Cell Batteries by Aspergillus niger

Jadhav, Umesh; Su, Chao; Chakankar, Mital; Hocheng, H.

doi:10.3390/batteries4040051

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…ferrooxidans is that zinc was not extracted. An another bioleaching study by Jadhav et al successfully extracted 100% of zinc and silver from battery wastes using Aspergillus niger. However, the further recovery of the silver metal from PLS was not investigated.…”

Section: Introductionmentioning

confidence: 99%

“…However, the further recovery of the silver metal from PLS was not investigated. Moreover, the bottlenecks of bioleaching process are time efficiency and the challenges related to the operating conditions of microorganisms, and these issues limit bioleaching in industrial application. , Therefore, other leaching media with low cost and environment impact are studied for the recycling of silver oxide batteries.…”

Section: Introductionmentioning

confidence: 99%

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Recovery of High-Purity Silver from Spent Silver Oxide Batteries by Sulfuric Acid Leaching and Electrowinning

Wang

Peng

Yliniemi

et al. 2020

ACS Sustainable Chem. Eng.

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A sustainable and effective sulfuric acid-based process with the combination of facile acid leaching and electrowinning has been developed for the recovery of valuable elements from spent silver oxide batteries. Results suggest that the dissolution of elementary Ag was markedly promoted by the presence of MnO2 in the spent silver oxide batteries. Also, H2O2 was added to support an improved Mn and Ag extraction after 240 min of leaching. In the leaching step, 97% of silver and over 99% of Mn and Zn could be extracted under the optimum conditions: 1 mol/L H2SO4, a leaching temperature of 70 °C, an S/L ratio of 50 g/L, addition of 3 v/v % H2O2 at 240 min, and a total leaching time of 270 min. Ultra-pure silver (Ag w/w % ≥ 99.98%) was further recovered from the pregnant leaching solution (PLS) by potentiostatic electrowinning. Under the optimum deposition potential of −0.10 V and after 4 h of electrowinning, the silver recovery reached 98.5% with a high energy efficiency of 98.7%. Simultaneously, 5.6% Mn was recovered on the anode in the form of MnO2. Overall, these promising results suggest feasibility in the recycling of silver oxide batteries in sulfuric acid media.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recovery of High-Purity Silver from Spent Silver Oxide Batteries by Sulfuric Acid Leaching and Electrowinning

Wang

Peng

Yliniemi

et al. 2020

ACS Sustainable Chem. Eng.

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“…Numerous studies have been performed for a long time to recover silver and zinc from silver oxide battery. The silver and zinc recovery methods can be classified as (a) chemical leaching by various lixiviants directly, (b) bioleaching by a microorganism, and (c) thermal treatment under different atmospheric condition . The chemical leaching method is a need to develop an eco‐friendly and sustainable process to recycle waste silver oxide batteries.…”

Section: Introductionmentioning

confidence: 99%

Recycling of Silver and Zinc from Silver Oxide Battery Waste

Morcali¹

2019

ChemistrySelect

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A remarkable number of batteries are used for powering various types of devices; however, after use, batteries are randomly thrown away, causing potential environmental dam-age to the bio-habitats and a loss of resources. Battery recycling processes should be comprehensively studied to address the aforementioned issues.In this work, a new recycling process was developed to recover silver and zinc from silver oxide battery waste with the purpose of presenting a selective as well as cost-effective process. The dissolution experiments were carried out to examine the following effects: lixiviants (NaOH and H 2 SO 4 ) concentration, agitation speed, L/S ratio, reaction temperature and time. Zinc extraction of 99% and no silver extraction were achieved using 100 mM NaOH for 6 h at 400 rpm under ambient conditions. Afterward, the pH solution was adjusted to be around seven in order to obtain a zinc hydroxide powder, and then zinc oxide was produced under atmospheric conditions of 650°C. The remaining material (i. e. that containing Ag Me -Ag 2 O) was easily converted to a fine metallic silver powder through two different methods. Interestingly, a submicron, fine metallic silver particle was produced via glucose reduction in alkaline media. This new recycling process for battery waste residues not only protects the environment but also considerably improves recycling economy. Additionally, this process may facilitate on further scaling-up studies and encourages industrial application.[a] Prof.

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“…In particular, silver recovery from silver oxide button cells has been studied due to the considerable quantities of the waste material and the high silver content present in them. [9][10][11][12][13][14] Silver oxide buttons batteries are widely used in small portable electronic such as toys, watches, digital calculators, hearing aids, etc. due to their high capacity per unit mass and long service life.…”

mentioning

confidence: 99%

“…Worldwide, billions of primary batteries are produced every year, although currently only a very small percentage of consumer disposable batteries are recycled. 14 Therefore, the ability to recover valuable materials from button cells is of considerable interest for both an environmental toxicity and economic point-of-view.…”

mentioning

confidence: 99%

Recovery of Silver from Dilute Effluents via Electrodeposition and Redox Replacement

Wang

Halli

Hannula

et al. 2019

J. Electrochem. Soc.

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In this study, the electrodeposition-redox replacement (EDRR) method was studied for the recovery of minor concentrations of silver from dilute solutions. The parameter optimization was carried out with synthetic solutions similar to silver oxide button battery recycling effluents, consisting of sulfuric acid and concentrated base metal (10 g•L −1 H 2 SO 4 , 60 g/L Zn 2+ ) with a minor amount of silver (100 ppm) and a varying amount of Fe 3+ ions. Results of these experiments were analyzed both electrochemically and by use of SEM-EDS. The role of dissolved Fe 3+ ions was studied by varying the concentration from 0 to 1000 ppm and the results showed that although the presence of Fe ions decreased silver recovery efficiency, final product purity was found to increase slightly. The EDRR process was also found to be more effective for Ag recovery and has less energy consumption when Fe 3+ concentrations are relatively low (≤ 100 ppm) when compared with conventional direct current electrowinning. In the final stage, silver was successfully recovered via EDRR, using the optimized conditions, from a real pregnant leaching solution (PLS) obtained from the leaching of silver oxide batteries.

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Leaching of Metals from Waste Silver Oxide-Zinc Button Cell Batteries by Aspergillus niger

Cited by 6 publications

References 13 publications

Recovery of High-Purity Silver from Spent Silver Oxide Batteries by Sulfuric Acid Leaching and Electrowinning

Recovery of High-Purity Silver from Spent Silver Oxide Batteries by Sulfuric Acid Leaching and Electrowinning

Recycling of Silver and Zinc from Silver Oxide Battery Waste

Recovery of Silver from Dilute Effluents via Electrodeposition and Redox Replacement

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