An emission-free controlled potassium pyrosulfate roasting-assisted leaching process for selective lithium recycling from spent Li-ion batteries

Combined pyro-hydrometallurgical technology for recovering valuable metal elements from spent lithium-ion batteries: a review of recent developments

“…(f) K 2 S 2 O 7 as an additive for the sulfation roasting of LCO cathode materials. 113 Copyright 2014, Elsevier.…”

“…More importantly, the temperature of sulfation roasting can be effectively reduced from 800 °C to 600 °C, reducing energy consumption. Given the problems of difficult transportation and dangerous experiments with H 2 SO 4 , Liu et al 113 (Fig. 6(e)) studied the selective sulfation roasting of LCO batteries using K 2 S 2 O 7 instead of H 2 SO 4 .…”

A green strategy for the selective recovery of lithium and the synthesis of CoFe2O4 catalyst for CO oxidation from spent lithium-ion batteries

“…The extraction efficiency of cobalt and lithium after water leaching were found to be 99.5% and 17.4%, respectively. Tang et al , 49 Fan et al , 51 Liu et al , 53 and Wang et al 54 achieved favorable results by employing pure reagents, such as C, NH 4 Cl, K 2 S 2 O 7 , and NaHSO 4 ·H 2 O, as additives for the selective roasting of LiCoO 2 . In this study, waste copperas was utilized as an additive for the selective sulfation roasting of LCO, resulting in extraction efficiencies of lithium and cobalt after water leaching of 95.73% and 2%, respectively.…”

Water as a Sustainable Leaching Agent for the Selective Leaching of Lithium from Spent Lithium-Ion Batteries

“…Further research has been conducted using a roasting process with different additives (e.g., (NH 4 ) 2 C 2 O 4 , H 2 , and K 2 S 2 O 7 ) at 500–700 °C or a mechanochemical process at 25 °C. − After the mixture was roasted, selective water leaching was carried out. Leaching efficiencies for lithium of 90–98% were achieved with temperatures of 25–60 °C, S/L-ratios of 5–50 g L –1 for LCO, and the NCM-material in a single-stage leaching process. − ,,,, Peng et al investigated a four-stage cross-current leaching process at 25 °C and a S/L-ratio of 500 g L –1 with a lithium concentration of 34.2 g L –1 in the leaching solution and obtained a leaching efficiency of 93% . Hu et al executed carbonated water leaching after carbothermal reduction utilizing the NCM-material at 25 °C, a S/L-ratio of 20 g L –1, and a gas feed stream of 20 mL min –1 , where more soluble LiHCO 3 compared to LiMO 2 (M represents Ni, Mn, Co, and Cu) was formed.…”