Recuperación de plomo de escorias usando solventes eutécticos profundos (DES) : Evaluación del lixiviante glicelina (glicerina + cloruro de colina) en la lixiviación de plomo de escorias obtenidas del proceso de reciclaje de baterías automotrices.

Abstract

The most common treatment in the recycling of lead acid batteries (LABs) is melting, which releases gases and solid residues (slags with approximately 2-6 % of Pb), which are potential sources of contamination. Within hydrometallurgy, deep eutectic solvent leaching (DES) is presented as an alternative to lead recovery due to its environmental and cost advantages. Therefore, the objective of the present work is to evaluate the application of (DES) glyceline for the leaching of Pb from slags obtained from the LABs recycling process. For this purpose, glyceline was prepared in a 1:2 molar ratio of choline chloride-glycerin with a concentration of 0.1 N iodine (Gly-I). The leaching tests were performed by adding 10 g of Gly-I and 0.2 g of sample, then the system was regulated at different temperatures (30, 50 and 80 ° C) and constant agitation for each test. Once the temperature was reached, time intervals were allowed to pass to obtain each aliquot, which was subsequently analyzed by atomic absorption. With the Pb readings obtained, recovery plots were made as a function of time for the different experimental stages, which showed that the increase in pressure and temperature influences the amount of lead leached. When comparing the results, it was determined that the best experimental conditions were obtained with the calcined sample leached in Gly-I at 50 °C for 2 h with a recovery of 39.74 % of leached Pb.