Abstract
Increasing the usage of lithium-ion batteries requires sufficient recycling strategies to save resources. In the collaborative research project LithoRecII a recycling process was investigated to completely recover solid and liquid value components of spent Li-ion batteries. The process combines discharging, dismantling, shredding, extraction, drying and mechanical separation steps. The grinding and drying stages are flushed with an inert drying gas producing an off-gas loaded with different organic solvent components. High boiling components can be removed with condensation, while low boiling components were captured by a consecutive adsorption. Using a flow sheet simulation the main influences on the exhaust gas flow and composition based on drying and condensation parameters were identified. This provided the basis for adsorption equilibrium and kinetics investigations. Finally, the results of adsorptive off-gas cleaning experiments carried out in a fixed-bed adsorber are presented.
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