|Title||Characterization and leaching of NiCd and NiMH spent batteries for the recovery of metals|
|Publication Type||Articolo su Rivista peer-reviewed|
|Year of Publication||2005|
|Authors||Pietrelli, L., Bellomo B., Fontana Danilo, and Montereali Maria Rita|
|Keywords||battery, Cadmium, cadmium derivative, Chemical composition, Composition, conference paper, Conservation of Natural Resources, cost benefit analysis, Electric batteries, electric battery, Electrochemistry, Electronic devices, electronic equipment, electronics, Energy-Generating Resources, Environmental Pollutants, environmental protection, Hydrometallurgy, hydroxide, Hydroxides, Kinetics, leaching, Metallurgy, Nickel, nickel complex, Nickel compounds, priority journal, Recycling, Recycling plants, Refuse Disposal, separation technique, Solubility, Temperature dependence, Thermal effects|
Since NiMH and NiCd batteries are still used in the electronic devices market, a treatment and recycling plant has many advantages both from the environmental and the economic points of view. Unfortunately, there is no relationship between shape, size and chemical composition of spent batteries, consequently the characterization and the leaching method of the starting material becomes an important step of the overall treatment process in choosing the best conditions for the selective separation of the metals by hydrometallurgy. Leaching at 20°C with H2SO4 2 M for about 2 h seems to be a good solution in terms of cost and efficiency for both battery types. The hydroxide compounds can be readily leached while Ni present as metallic form requires more aggressive conditions due to kinetic constraints. In this paper, the characterization of NiMH and NiCd spent batteries and the results of leaching tests in different conditions are reported. © 2005 Elsevier Ltd. All rights reserved.
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