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Heavy Metals Recovery from Electroplating Sludge by Multi-Steps of Electrodepositing and Precipitating

Author(s): Changsheng Peng | Qingbao Gu | Panpan Li | Ruijie Jin

Journal: Scientific Journal of Frontier Chemical Development
ISSN 2167-163X

Volume: 1;
Issue: 1;
Start page: 9;
Date: 2011;
Original page

Keywords: Electroplating sludge | heavy metal recovery | acid-leaching | electrodepositing | ammonium jarosite precipitating

A combined processes of acid-leaching, electrodepositing and ammonium jarosite precipitating was developed to recover heavy metals from an electroplating sludge. More than 97% of copper, nickel, chromium, and 84% of iron were extracted from the sludge with 10% H2SO4 leaching. More than 99% of copper was recovered from the leaching solution with electrodepositing process. The left solution after copper recovery was then treated with ammonium jarosite precipitating process, about 99.9% of chromium and iron could be deposited as chromium ferrite in this process. Finally, the left solution was treated with electrodepositing process again for nickel recovery, and about 58% of nickel could be recovered in this process under the condition of pH 5.5 and voltage 5.5V.
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