Recovery of tin from metal powders of waste printed circuit boards

•Tin was leached efficiently by pressure oxidation leaching.•Lead and zinc in leaching solution were recovered selectively by purification.•High purity tin was obtained by electrowinning.•Copper has been further enriched after leaching process. To avoid the adverse effects of tin on the smelting pro...

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Bibliographic Details
Published in:	Waste management (Elmsford) Vol. 68; pp. 449 - 457
Main Authors:	Yang, Tianzu, Zhu, Pengchun, Liu, Weifeng, Chen, Lin, Zhang, Duchao
Format:	Journal Article
Language:	English
Published:	United States Elsevier Ltd 01-10-2017
Subjects:	Copper Electronic Waste Metal powders Metals Powders Pressure oxidation leaching Refuse Disposal Tin Waste printed circuit boards Tin Waste printed circuit boards Metal powders Pressure oxidation leaching
Online Access:	Get full text
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Summary:	•Tin was leached efficiently by pressure oxidation leaching.•Lead and zinc in leaching solution were recovered selectively by purification.•High purity tin was obtained by electrowinning.•Copper has been further enriched after leaching process. To avoid the adverse effects of tin on the smelting process used to recover copper from metal powders of waste printed circuit boards, an effective process is proposed that selectively extracts tin and its associated metals. That impacts of alkaline pressure oxidation leaching parameters on metal conversion were systematically investigated. The results showed that Sn, Pb, Al and small amounts of Zn in the metal powders were leached out, leaving copper residue. By optimizing the conditions, leaching recovery of 98.2%, 77.6%, 78.3 and 6.8% for Sn, Pb, Al and Zn, respectively, were achieved. Subsequently, more than 99.9% of Pb and Zn in the leaching solution were removed as a mixture of PbS-ZnS in the purification process, which can be used as a raw material in Pb smelting. Approximately 86.2% of Sn in the purified solution was recovered by electrowinning, and the purity of the cathode tin was over 99.8%.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0956-053X 1879-2456
DOI:	10.1016/j.wasman.2017.06.019