Use of sustainable extractants for the Zn recovery from spentbatteries for agricultural purposes
- 1Departamento de Ingeniería Geológica y Minera. E.T.S.I. Minas y Energía. Universidad Politécnica de Madrid, C/ Rosas, 21-Madrid, España. C.P. 28003
- 2Departamento de Producción Agraria. ETSIAAB. Universidad Politécnica de Madrid. C/Ríos Rosas nº21, 28003, Madrid, Spain
- 3Chemical and Food Technology Department. CEIGRAM, Research Centre for the Management of Agricultural and Environmental Risks, Universidad Politécnica de Madrid 28040 Madrid, Spain
The demand for metals is increasing, so the need of looking for greener alternatives to obtain them [1]. Techniques such as hydrometallurgy have been thoroughly studied to obtain better metal recoveries from different feedstocks, including low-grade ores, mine tailings, and spent batteries, which are normally difficult and expensive to treat [2]. This study focused on the implementation of an amino acid to promote metal recovery, particularly Zn from spent batteries, and its possible application in agriculture. For the leaching, we used a ratio of glycine (8/1), hydrogen peroxide, and sodium hydroxide (to adjust pH) at room temperature, 200 rpm, and different pH values (7.0, 8.0, 9.0, 10.0, 11.0, and 12.0). At 0.5, 1, 2, 4, 6, 22, and 24 h, we measured pH and potential and took aliquots of each sample. Subsequently, samples were characterized by atomic absorption spectrometry and processed. According to the results, the best recoveries were achieved at lower pH values. Although the results obtained are not on par with those of acid leaching systems, they provide important insights into factors that may affect recovery rates (i.e., type of material, pH, glycine/oxidant agent) [3,4], which leads to the development of strategies to optimize them.
Acknowledgments: This research has been funded by the Ministerio de Ciencia e Innovación y Universidades (MCIU), Agencia Estatal de Investigación (AEI), and European Union “NextGenerationEU” with grant number TED2021-131198B-I00 “GREEN-AGRO-REC”.
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How to cite: Barragan Mantilla, S. P., Ortiz, R., Gascó, G., Sánchez, L., Almendros, P., and Méndez, A.: Use of sustainable extractants for the Zn recovery from spentbatteries for agricultural purposes, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-21199, https://doi.org/10.5194/egusphere-egu24-21199, 2024.
