Shi Chaoya, Huang Yanfang, Su Shengpeng, Han Guihong, Sun Hu, Yang Shuzhen, Liu Bingbing
School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001 Henan, PR China.
Zhongyuan Critical Metals Institute, Zhengzhou University, Zhengzhou 450001 Henan, PR China; School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001 Henan, PR China; Zhongyuan Critical Metals Laboratory, Zhengzhou 450001 Henan, PR China.
Ultrason Sonochem. 2025 Mar;114:107237. doi: 10.1016/j.ultsonch.2025.107237. Epub 2025 Jan 19.
High-efficiency dezincification from waste galvanized iron sheets is crucial for resource recovery and environmental protection. In this work, ultrasound-assisted acid pickling and ion flotation techniques were combined to intensify the Zn extraction and separation from the waste galvanized iron sheets. The effects of leaching parameters on the leaching rate of Zn and Fe, Zn leaching kinetics and leaching electrochemistry were compared between conventional leaching and ultrasonic-assisted leaching. It's demonstrated that ultrafast dezincification is realized as the acid pickling time can be reduced from 10 min to 60 s with ultrasound assistance, and the Zn and Fe leaching rates are 99.9 % and 0.02 %, respectively. Ion flotation was adopted to recover the Zn ion from the circulated leaching solution using sodium dodecyl benzene sulfonate (SDBS) as the collector. After the Zn ion flotation, powdery ZnO with size distribution of 1-3 μm is prepared from the froth product after calcining at 600 ℃ for 2 h. In addition, various characterizations involving thermodynamics, XRD, XPS, SEM-EDS, TG-DSC, and FTIR analyses were employed to elucidate the mechanisms underlying the enhancement of Zn dissolution through ultrasound assistance and the Zn capture mechanism via ion flotation. Eventually, the combination of ultrasonic-assisted acid pickling and ion flotation techniques can achieve the rapid selective Zn extraction from waste galvanized iron sheet and fast separation of Zn ion from leachate, which can provide technical reference for the resource utilization of other waste metal coating plates.
从废旧镀锌铁皮中高效脱锌对于资源回收和环境保护至关重要。在这项工作中，将超声辅助酸洗和离子浮选技术相结合，以强化从废旧镀锌铁皮中提取和分离锌。比较了常规浸出和超声辅助浸出过程中浸出参数对锌和铁浸出率、锌浸出动力学和浸出电化学的影响。结果表明，在超声辅助下，酸洗时间可从10分钟缩短至60秒，实现了超快脱锌，锌和铁的浸出率分别为99.9%和0.02%。采用离子浮选法，以十二烷基苯磺酸钠（SDBS）为捕收剂，从循环浸出液中回收锌离子。锌离子浮选后，将泡沫产物在600℃煅烧2小时，制备出粒径分布为1-3μm的粉末状氧化锌。此外，还采用了包括热力学、XRD、XPS、SEM-EDS、TG-DSC和FTIR分析在内的各种表征方法，以阐明超声辅助增强锌溶解的机制以及离子浮选捕集锌的机制。最终，超声辅助酸洗和离子浮选技术的结合能够实现从废旧镀锌铁皮中快速选择性提取锌，并从浸出液中快速分离锌离子，可为其他废旧金属涂层板的资源利用提供技术参考。
