نوع مقاله : مقاله کامل پژوهشی
موضوعات
عنوان مقاله English
نویسندگان English
The rising global demand for lithium, particularly for lithium-ion batteries, necessitates efficient recovery methods from secondary sources. This study investigated the effect of short-term acid leaching pretreatment on mechanochemical lithium extraction from spent NCM811 cathodes. Three acid systems—HCl, H2SO4 with 4% vol. H2O2, and CH3COOH with 4% vol. H2O2—were tested, along with co-grinding milling powders (NaCl and SiO2). Pretreatment with H2SO4 and 4% vol. H2O2 initially reduced extraction efficiency due to the formation of a stable oxide layer; however, with extended milling and a higher ball-to-powder ratio (40:1), lithium recovery reached approximately 94%. HCl exhibited concentration-dependent effects, with 2 M HCl yielding over 89% recovery after 9 hours, while 1 M HCl resulted in lower performance. Acetic acid produced the lowest recovery (~72%) due to its weak acidity and limited oxidation strength. These findings demonstrate that combining short-term acid pretreatment with mechanochemical processing substantially enhances lithium recovery efficiency, offering a promising and scalable strategy for sustainable recycling of lithium from spent batteries.
کلیدواژهها English