Problems of long extraction time, large footprint, low single‐stage extraction efficiency, and complicated production processes in solvent extraction equipment in recycling of modern industrial precious metal waste liquids are addressed and application of miniaturized equipment to hydrometallurgy is proposed in this study. A 3D‐printed multichannel microfluidic reactor will likely replace traditional extraction equipment. The reactor was applied to experiments concerning tributyl phosphate extraction and separation of platinum, palladium and rhodium precious metal ions in a hydrochloric acid system. Results showed that, under the conditions of a ratio of 1:1 and a flow rate of 192.5 mL min‐1 (processing capacity of 1.5L h‐1), the extraction rates of platinum and palladium are 84.26% and 96%, and the separation coefficient is β_Pt/Rh and β_{Pd /Rh} is 132.35 and 753.5,moreover, the optimized extraction rate of platinum and palladium in the reactor increases by 2% and 1%, respectively. Hence, the extraction effect of this reactor is better than conventional industrial single‐stage extraction (extraction time 12min, platinum extraction rate 87.43%, palladium extraction rate 90.86%, separation coefficients β_Pd/Rh and β_Pt/Rh are only 65.3 and 45.7). In summary, compared with conventional extraction, microreactor extraction can increase the separation coefficient, shorten the extraction time, and the total processing capacity can reach the industrial production level. In addition, this study also discussed the influence of microreactor structure optimization on the extraction effect. © 2020 Society of Chemical Industry

中文翻译：

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3D打印大流量微反应器在铂，钯和铑的萃取和分离中的微型化应用

解决了现代工业贵金属废液回收中提取时间长，占地面积大，单级提取效率低，溶剂提取设备生产工艺复杂的问题，并提出了小型设备在湿法冶金中的应用。3D打印的多通道微流反应器可能会取代传统的萃取设备。该反应器用于在盐酸体系中进行磷酸三丁酯萃取和分离铂，钯和铑贵金属离子的实验。结果表明，在1：1的比例和192.5 mL min-1的流速（1.5L h-1的处理量）的条件下，铂和钯的萃取率分别为84.26％和96％，而分离系数为β_{Pt / Rh}和βPd _{/ Rh分别}为132.35和753.5，反应器中铂和钯的最佳提取率分别提高了2％和1％。因此，该反应器的萃取效果优于常规工业单级萃取（萃取时间12min，铂萃取率87.43％，钯萃取率90.86％，分离系数βPd _{/ Rh}和_{βPt / Rh}只有65.3和45.7）。综上所述，与常规提取相比，微反应器提取可以增加分离系数，缩短提取时间，总处理能力可以达到工业生产水平。此外，本研究还讨论了微反应器结构优化对萃取效果的影响。©2020化学工业协会