Treatment of nanowaste via fast crystal growth: With recycling of nano-SnO₂ from electroplating sludge as a study case

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• 作者：Zanyong Zhuang^a ; Xinjiang Xu^a ; Yongjing Wang^a ; Yandi Wang^b ; Feng Huang^b ; Zhang Lin^a ; ^{zlin@fjirsm.ac.cn}
• 关键词：Metals recovery ; Tin oxides ; Electroplating sludge ; Fast crystal growth ; Mineralization
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：15 April, 2012
• 卷：211-212
• 期：Complete
• 页码：414-419
• 文件大小：868 K

摘要

The treatment of industrial sludge containing amorphous/nanophase metal oxides or hydroxides is one of the vital issues in hazardous waste disposal. In this work, we developed a strategy to recycle nano-SnO₂ from tinplate electroplating sludge. It revealed that the major components of this sludge were acid soluble Sn and Fe amorphous phases. By introducing NaOH as a mineralizer, a fast growth of amorphous Sn compound into acid-insoluble SnO₂ nanowires was achieved selectively. Thus, the as-formed nano-SnO₂ could be recycled via dissolving other solid compositions in the sludge by using acid. The role of NaOH on accelerating both the Oriented Attachment (OA) and Ostwald Ripening (OR) growth of SnO₂ was discussed, which was regarded as a critical factor for treating the sludge. A pilot-scale experiment was conducted to treat 2.3 kg original sludge and the recycling of about 90 g nano-SnO₂ was achieved. We anticipate this work can provide a good example for the recycling of valuable metals from industrial sludge containing fine metal oxides or hydroxides.