Optimized hydrometallurgical route to produce ultrafine zinc powder from industrial wastes in alkaline medium
A hydrometallurgical process for producing ultrafine zinc powder from industrial wastes containing zinc was proposed.This process consists of alkaline leaching,purification stage,and electrowinning section.Firstly,affecting factors,such as leaching condition and waste sample composition were studied.In the alkaline medium,the leaching extractions of Zn and Pb are above 80% and 90%.Moreover,the residue was detoxified completely.In the purification section,the Pb,Sn and Al were separated by adding Na2S,Zn and CaO,respectively.Experiments were performed to obtain the optimal condition.Hence,more than 90 % of metal impurities could be removed.Finally,zinc electrowinning was undertaken with addition of the Pb,Sn and Al.Morphology and size distribution of Zn particles were characterized by Scanning Electron Microscopy and Laser Particle Size Analyzer.The electrowiuning results show that metal impurities could evidently reduce the size of zinc particle under optimum condition.Through this process,ultrafine zinc powders with a mean diameter of aroand 10 μ m,containing less than 100 ppm of metallic impurities,could be obtained.
Hazardous wastes Alkaline leaching Electrowinning Ultrafine Zn powder
Qiang Li Youcai Zhao Jiachao Jiang Chenglong Zhang
The State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092 School of Environment Science and Spatial Informatic, China University of Mining and Technology, Xuz School of Urban Development and Environmental Engineering, Shanghai Second Polytechnic University, S
国际会议
The Seventh International Conference on Waste Management and Technology(第七届固体废物管理与技术国际会议(ICWMT7))
北京
英文
674-682
2012-09-05（万方平台首次上网日期，不代表论文的发表时间）