alternative silver production by environmental sound processing of a sulfo salt silver mineral found in bolivia
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ID: 196991
2018
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Abstract
Very often, the production of silver causes devastating environmental issues, because of the use of toxic reagents like cyanide and mercury. Due to severe environmental damage caused by humans in the last decades, the social awareness regarding the sustainable production processes is on the rise. Terms like “sustainable” and “green” in product descriptions are becoming more and more popular and producers are forced to satisfy the rising environmental awareness of their customers. Within this work, an alternative environmental sound silver recovery process was developed for a vein type silver ore from Mina Porka, Bolivia. A foregoing characterization of the input material reveals its mineral composition. In the following mineral processing, around 92.9% silver was concentrated by separating 59.5 wt. % of non-silver minerals. Nitric acid leaching of the generated concentrate enabled a silver recovery of up to 98%. The dissolved silver was then separated via copper cementation to generate a metallic silver product of >99% purity. Summarizing all process steps, a silver yield of 87% was achieved in lab scale. A final upscaling trial was conducted to prove the process’ robustness. Within this trial, almost 4 kg of metallic silver with a purity of higher than 99.5 wt. % was produced.
| Reference Key |
birich2018metalsalternative
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| Authors | ;Alexander Birich;Bernd Friedrich;Lars Gronen;Janet Katzmarzyk;Ivan Silin;Hermann Wotruba |
| Journal | seminars in cancer biology |
| Year | 2018 |
| DOI |
10.3390/met8020114
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