Optimizing the Conditions for Leaching Lead from Solid Waste Produced by Pyrometallurgical Process of Recycling Automobile Used Batteries
DOI:
https://doi.org/10.29356/jmcs.v50i2.1304Keywords:
Automobile battery recycling, lead leaching time, pH, temperature, particle sizeAbstract
Abstract. Over 90 % of automobile used lead-acid batteries are recycled worldwide. The typical new car battery contains 60-80 % recycled lead. The current method of disposing lead-contaminated solid waste, generated by lead-acid battery recycling industries, is to bury it in a remote waste management site. This practice of disposing such hazardous solid waste (~22 % in lead) is not a positive approach to solve the environmental problem. In this work we determined the optimal conditions for leaching lead from solid waste using EDTA. Our experimental results indicate that at pH 4.8, a leaching temperature of 55oC and a 30 min leaching time, 96.8 % of lead present was leached from the solid having particle size <325 mesh (0.051 mm).
Resumen. En todo el mundo más del 90 % de las baterías de automóvil plomo-ácido son recicladas. Una batería nueva para automóvil contiene de 60 a 80 % de plomo reciclado. El método común de confinamiento de los desechos sólidos contaminados con plomo, generados por la industria recicladora de baterías de plomo-ácido, es enterrarlos en un sitio lejano de manejo de desechos. Esta práctica de confinar tales desechos sólidos (~22 % de plomo) no es adecuada para resolver el problema ambiental. En este trabajo encontramos las condiciones óptimas de lixiviación de plomo de desechos sólidos usando EDTA. Nuestros resultados experimentales indican que se lixivió el 96.8 % del plomo presente en el sólido que tiene un tamaño de partícula < 325 mesh (0.051 mm) a pH 4.8, temperatura de 55 oC y 30 min de tiempo de lixiviación.
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