Tin recovery from an electroplating sludge

Tin electroplating from a fluoroborate electrolyte produces sludge containing approximately 50% tin. It can be extracted by leaching the sludge with concentrated hydrochloric acid at room temperature for one month or by boiling in 10% HCl solution for two hours. Electrowinning from H 2SnCl 6 solutio...

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Bibliographic Details
Published in:Resources, conservation and recycling conservation and recycling, 1991, Vol.6 (1), p.61-69
Main Authors: Stefanowicz, Tadeusz, Golik, Tomasz, Napieralska-Zagozda, Stefania, Osińska, Małgorzata
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Other industrial wastes. Sewage sludge
Pollution
Wastes
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Summary:Tin electroplating from a fluoroborate electrolyte produces sludge containing approximately 50% tin. It can be extracted by leaching the sludge with concentrated hydrochloric acid at room temperature for one month or by boiling in 10% HCl solution for two hours. Electrowinning from H 2SnCl 6 solution with a steel cathode and graphite anodes permits recovery of tin with 93% efficiency at tin concentrations in the electrolyte exceeding 50 g/l and a current density of 5 A/dm 2. The cell is covered with a box with air passing through two washers filled with 15–20% NaOH solution. Chlorine gas evolved at the anodes is adsorbed in washers; sodium hypochlorite, of more than 10% strength in solution, is yielded as a byproduct, with 80% efficiency.
ISSN:0921-3449
1879-0658
DOI:10.1016/0921-3449(91)90006-A