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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Rare Metal Extraction & Processing
Presentation Title Eutectic Freeze Crystallization for Recovery of Cobalt Sulfate in the Recycling of Li-ion Batteries
Author(s) Yiqian Ma, Amanda Sjögren, Michael Svärd, Xiong Xiao, James Gardner, Richard T. Olsson, Kerstin Forsberg
On-Site Speaker (Planned) Kerstin Forsberg
Abstract Scope The crystallization of cobalt sulfate within a typical hydrometallurgical process for the recycling of Li-ion batteries has been investigated. The cobalt sulfate salt was obtained by eutectic freeze crystallization (EFC) from a synthetic acidic strip liquor after solvent extraction. The ternary phase diagram of CoSO4-H2SO4-H2O was first established by the mixed-solvent electrolyte (MSE) model to predict and reveal the changes in the system during the freezing process and to assess the conditions required for EFC. Batch EFC experiments were then conducted for the cobalt strip liquor. It is shown that, with suitable control of supersaturation, seeding and stirring, pure ice and salt crystals can be recovered as separate phases at the eutectic temperatures, with the crystalline salts in the form of a heptahydrate. The crystallization process can be described using the ternary phase diagram. After washing, CoSO4·7H2O obtained usng EFC is shown to meet the standards of a battery-grade product.
Proceedings Inclusion? Planned:
Keywords Hydrometallurgy, Recycling and Secondary Recovery, Process Technology


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Eutectic Freeze Crystallization for Recovery of Cobalt Sulfate in the Recycling of Li-ion Batteries
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