Journal
WASTE MANAGEMENT
Volume 60, Issue -, Pages 561-568Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2016.12.001
Keywords
Closed-circuit leaching/electrowinning; Copper; Iron; Lead; Citrate solutions; Electronic waste
Categories
Funding
- CONACyT Fronteras de la Ciencia [637]
- Consejo Nacional de Ciencia y Tecnologia (CONACyT) [300856]
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An integral closed circuit hydrometallurgical process is presented for base metal recovery from electronic waste. The leaching medium consists of a sodium citrate solution, from which base metals are retrieved by direct electrowinning, and the barren solution is recycled back to the leaching stage. This leaching-electrowinning cycle was repeated four times. The redox properties of the fresh citrate solution, as well as the leach liquors, were characterized by cyclic voltammetry to determine adequate conditions for metal reduction, as well as to limit citrate degradation. The leaching efficiency of electronic waste, employing the same solution after four complete cycles was 71, 83 and 94% for copper, iron and lead, respectively, compared to the original leach with fresh citrate solution. (C) 2016 Elsevier Ltd. All rights reserved.
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