Effective recycling of valuable metals from the spent lithium-ion batteries (LIBs) is of great importance from the perspective of resource recycling and environmental conservation. In this work, a comprehensive recovery process of impurities removal and valuable metals co-extraction from simulated leaching solution of spent LIBs with CA12-TBP system was investigated. Firstly, more than 99.7% of Al, Fe and Cu were removed by co-extraction with 30 vol% CA12 (25% saponification degree) and 20 vol% TBP after three-stage extraction. The Ni, Co and Mn lost in the organic phase were decreased to 0.18%, 0.09% and 0.06% by single-stage scrubbing. Then, Fe, Cu and Al loaded in organic phase were completely stripped by 0.5 mol/L H 2 SO 4 and 0.01 mol/L Na 2 SO 3 through a four-stage stripping. After impurities removal, more than 99.9% of Ni, Co and Mn in the raffinate solution were selectively co-extracted with 30 vol% CA12 (60% saponification degree) and 15 vol% TBP after a three-stage extraction, and 7.88% of Li was co-extracted. Then, after a four-stage scrubbing experiment, only 0.52% of Li was lost in the loaded organic phase, which demonstrated that our system possesses the potential of efficient recovery of Ni, Co and Mn from the spent LIBs. Further, Ni, Co and Mn loaded in the organic were completely stripped with 1 mol/L sulfuric acid, and could be directly used for the preparation of the recycled ternary material precursors. Finally, Li in the raffinate solution was recovered by precipitation using Na 2 CO 3 , with the yield and purity of 96.4% and 99.6%. Overall, this recycling process with high impurity removal efficiency and valuable metals recovery efficiency not only simplify the production process, but also greatly reduces production costs, which is helpful for the regeneration and utilization of spent LIBs.
Yaxing Han,Ji Chen,Yuefeng Deng,Tianchi Liu,Hailian Li,Deqian Li
The current separation technique of ion-adsorption high yttrium (Y) rare earth ore (high-yttrium ore) using 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507) and naphthenic acid (NA) has been confronted with low separation efficiency and high acid consumption. This is a consequence of the low selectivity and the difficulty of complete stripping of heavy rare earths (HREEs). Therefore, an innovative separation technique of high-yttrium ore was proposed. The leachate of high-yttrium ore was firstly divided into Erbium (Er) / Thulium (Tm) groups with P507-isooctanol followed by separating Y (III) from the high Y-enrichment of Er (III) group with sec -octylphenoxy acetic acid (CA12)-tri- n -butyl phosphate (TBP). The basic thermodynamics experiments and cascade extraction simulations were conducted to verify the feasibility of this technology. The results show that P507-15vol% isooctanol is superior to P507 in both stripping ability and separation selectivity of HREEs. The first cascade extraction for Er (III) / Tm (III) grouping with P507-15vol% isooctanol was simulated successfully, reducing acid consumption but obtaining high purity products. In theory, the second cascade extraction simulation designed for separating Y (III) with CA12-TBP could not only improve the separation ability between Y (III) and light rare earths (LREEs) but also shorten the extraction stages and reduce the production costs. All these results revealed that this two-step separation process probably provided a promising application prospect for separating high-yttrium ore.
危险品化学品经营许可证（带存储）