Junjie Shi, Dong Chen, Changle Hou, Min Chen, Sheng Li, Jianzhong Li
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引用次数: 0
Abstract
With a purpose of selective extraction of lithium from spent lithium-ion batteries, the sulfation roasting of cathode material with gypsum waste followed by water leaching was proposed in the present study. The thermodynamics and kinetics of the sulfation roasting process were systematically studied. The activation energy, pre-exponential factor, and reaction mechanism function of the sulfation roasting reaction were determined to be 220.93 kJ/mol, 6.264 × 102, and g(α) = 1-(1-α)2/3, respectively. The optimal parameters for the sulfation roasting process were identified as a roasting temperature of 750 °C, a mass ratio of graphite, gypsum, and cathode material at 0.4:0.8:1, and a roasting duration of 60 min. Under these conditions, the Li leaching rate reached 79 %, while the leaching rates of Ni, Co, and Mn remained near 0. Li from the cathode material preferentially reacted with CaSO4 to form Li2SO4 and CaCO3, while some Li also reacted with CaCO3 to produce Li2CO3. Ni, Co, and Mn in the cathode material initially formed intermediate products such as LixNi2-xO2, LixCo1-xO, and LiMn2O4. These intermediates eventually transformed into Ni, Ni3S2, Co, MnO, and Li2CO3 in the presence of graphite.
期刊介绍:
Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.