ABSTRACT
With the continuous promotion of policies such as “Carbon Peak and Neutrality” and “Circular Economy”, the treatment of high-polluting off-gas such as SO2 and emitted by industry and the utilization of high-value-added “urban minerals” such as spent lithium-ion batteries have become a global research hotspot. Herein, based on the concept of “waste to waste”, this paper makes full use of the huge heat carried by the high-temperature SO2 off-gas emitted by industry to preheat the waste lithium-ion battery and converts lithium into soluble sulfate based on gas-solid sulfation roasting. The Computational Fluid Dynamics (CFD) simulation and calculation results show that by utilizing off-gas of 1000°C to heat cathode powder, after 2 h the whole sample can reach 700°C. Combined with roasting experiments, the recovery rate of Li was more than 99% at 600–800°C in different proportions of SO2 mixed atmosphere.
Our research provides a probable way for the “sulfation roasting-water leaching” process, to form a higher efficiency, higher recovery rate and lower energy consumption mode. Finally, we considered the promising direction of spent lithium-ion battery recovery processes and comprehensive co-treatment of urban waste in China under the dual carbon target.
