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Platinum Recovery from Industrial Process Solutionsby Electrodeposition–Redox Replacement

机译：从工业流程解决方案中回收铂金通过电沉积–氧化还原替代

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摘要

In the current study, platinum—present as a negligible component (below 1 ppb, the detection limit of the HR-ICP-MS at the dilutions used) in real industrial hydrometallurgical process solutions—was recovered by an electrodeposition–redox replacement (EDRR) method on pyrolyzed carbon (PyC) electrode, a method not earlier applied to metal recovery. The recovery parameters of the EDRR process were initially investigated using a synthetic nickel electrolyte solution ([Ni] = 60 g/L, [Ag] = 10 ppm, [Pt] = 20 ppm, [H2SO4] = 10 g/L), and the results demonstrated an extraordinary increase of 3 × 105 in the [Pt]/[Ni] on the electrode surface cf. synthetic solution. EDRR recovery of platinum on PyC was also tested with two real industrial process solutions that contained a complex multimetal solution matrix: Ni as the major component (>140 g/L) and very low contents of Pt, Pd, and Ag (i.e., <1 ppb, 117 and 4 ppb, respectively). The selectivity of Pt recovery by EDRR on the PyC electrode was found to be significant—nanoparticles deposited on the electrode surface comprised on average of 90 wt %platinum and a [Pt]/[Ni] enrichment ratio of 1011 comparedto the industrial hydrometallurgical solution. Furthermore, otherprecious metallic elements like Pd and Ag could also be enriched onthe PyC electrode surface using the same methodology. This paper demonstratesa remarkable advancement in the recovery of trace amounts of platinumfrom real industrial solutions that are not currently considered asa source of Pt metal.
机译：在当前的研究中，通过电沉积-氧化还原替代（EDRR）回收了铂（作为可忽略的组分（低于1 ppb，在所用的稀释液中HR-ICP-MS的检测极限）存在）热解碳（PyC）电极上的方法，这是一种尚未较早应用于金属回收的方法。最初使用合成镍电解质溶液（[Ni] = 60 g / L，[Ag] = 10 ppm，[Pt] = 20 ppm，[H2SO4] = 10 g / L）研究EDRR工艺的回收率参数，结果表明，电极表面上的[Pt] / [Ni]显着增加了3×10 5 。合成溶液。还使用两种包含复杂的多金属溶液基质的实际工业过程溶液测试了PyC上的EDRR铂回收：以镍为主要成分（> 140 g / L）和极低的Pt，Pd和Ag含量（即1 ppb，117和4 ppb）。发现通过EDRR在PyC电极上回收Pt的选择性非常重要-沉积在电极表面的纳米颗粒平均占90 wt％铂与[Pt] / [Ni]富集比为10 11 工业湿法冶金解决方案。此外，其他钯和银等贵金属元素也可以在使用相同的方法制备PyC电极表面。本文演示痕量铂金回收方面的显着进步来自目前不被认为是的实际工业解决方案铂金属的来源。

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