Reactive Solvent Extraction of Manganese from Spent Lithium-Ion Batteries
Sprache des Vortragstitels:
Englisch
Original Tagungtitel:
International Solvent Extraction Conference ISEC 2022
Sprache des Tagungstitel:
Englisch
Original Kurzfassung:
Background
Lithium-ion batteries (LIB) are a mature technology in mobile applications. Supported by global decarbonization, the share of hybrid and battery-electric vehicles is growing. This is accompanied by an increase in the demand for primary raw materials, which causes a major environmental impact. In addition, environmental hazards arise from landfilling of spent LIBs. Recycling can face these problems. However, secondary raw materials must be economically and qualitatively competitive with those from primary winning. Current recycling strategies target elemental components, such as copper and aluminum from the collector foils or iron from the housing. The recovery of lithium, cobalt, manganese, and nickel is particularly challenging. They are chemically bound in the active material.
Method
In the present work, the recovery of manganese from the active material (containing Co, Mn, Ni, Li) is considered by reactive solvent extraction. The extraction behavior was investigated in an equilibrium study on both synthetic and industrial leaching solutions. Di-(2-ethylhexyl)phosphoric acid (D2EHPA) and Cyanex 272 were used as ion exchangers. The influence of partially saponified D2EHPA on extraction yield, selectivity, and equilibrium pH was investigated. Subsequently, the experimental results were transferred to continuous extraction in a pulsed extraction column. A DN 50 Disc and Doughnut column was used, therefore. A hydrodynamic investigation of the column was carried out concerning column load, phase ratio, and pulsation intensity. Then, mass transfer experiments were performed to describe the extraction yield using multilinear regression. Additionally, the application of partially saponified D2EHPA was investigated regarding industrial leaching solution.
Forschungs-