关于在电子废物回收利用背景下使用硫代硫酸盐-铜(II)-氨系统浸出银的泡沫使用情况的研究

IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Cyriaque Bruez , Anne Rousseau , Grégory Lefèvre , Cécile Monteux
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引用次数: 0

摘要

由于其物理特性,许多电子废物中都含有金属银。其回收利用需要选择性提取,第一步是浸出银。这项工作的重点是用 Cu(II)/NH3/S2O32- 来浸出银,它已被广泛用于金的浸出。正如最近在铜的浸出过程中所显示的那样,使用水相由浸出化学品组成的泡沫是减少环境足迹的一种有前途的方法,因为它可以通过 O2 在泡沫之间的快速转移来改善金属氧化。在这项研究中,金属银样品由 Cu(II)/NH3/S2O32- 溶液制成的泡沫溶解,泡沫中的气泡由 O2-N2 混合物组成。硫代硫酸法的主要问题是其在金属氧化过程中会发生降解,因此需要使用大量的这种反应物。我们的浸出泡沫所获得的结果表明,与溶液相比,每使用一定量的硫代硫酸盐所浸出的银量大约是溶液的三倍,这将为这一问题带来一种新的解决方法。此外,我们还研究了气泡大小和气体成分(二氧分压)的作用。此外,我们还发现,溶解的银在泡沫柱和底部溶液之间的分布不均匀,90% 的银都积聚在泡沫内部,这为在浸出过程中轻松分离银提供了一个有趣的视角。通过比较几种表面活性剂,我们发现只有非离子表面活性剂聚氧乙烯油基醚(Brij O10)的效果令人满意,而十二烷基三甲基氯化铵很可能会与银络合物结合,导致泡沫迅速崩溃。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation of the use of foams for silver leaching using the thiosulfate‑copper(II)-ammonia system in the context of e-waste recycling

Due to its physical properties, metallic silver is present in numerous electronic wastes. Its recycling requires selective extraction, which involves leaching of silver as the first step. This work focusses on leaching silver with Cu(II)/NH3/S2O32 which has been widely used for gold leaching. As recently shown for the leaching of copper, using foams whose aqueous phase consists of leaching chemicals is a promising way to reduce the environmental footprint, by improving the metal oxidation caused by the fast transfer of O2 from bubble to bubble. In this work, metallic silver samples are dissolved by foams made of Cu(II)/NH3/S2O32 solution with bubbles composed of O2-N2 mixtures. The main problem of the thiosulfate route is its degradation during metal oxidation hence it requires using large quantities of this reactant. The results obtained for our leaching foams show that the quantity of silver leached per quantity of thiosulfate used is about three times greater in comparison with a solution, which would bring a new approach to this problem. Moreover, we investigate the role of the bubble size and the gas composition (dioxygen partial pressure). Besides we find that the dissolved silver is inhomogeneously distributed between the foam column and the bottom solution, with an accumulation of 90 % of silver inside the foam, hence opening an interesting perspective for an easy separation of silver upon leaching. Comparing several surfactants, we show that only non-ionic surfactant polyoxyethylene oleyl ether, Brij O10, shows satisfying results, while dodecyl trimethyl ammonium chloride most likely binds with silver complexes and triggers a quick collapse of the foams.

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来源期刊
Hydrometallurgy
Hydrometallurgy 工程技术-冶金工程
CiteScore
9.50
自引率
6.40%
发文量
144
审稿时长
3.4 months
期刊介绍: Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.
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