Abstract
H(1.6)Mn(1.6)O(4) lithium-ion screen adsorbents were synthesized by soft chemical synthesis and solid phase calcination and then applied to the recovery of metal Li and Co from waste cathode materials of a lithium cobalt oxide-based battery. The leaching experiments of cobalt and lithium from cathode materials by a citrate hydrogen peroxide system and tartaric acid system were investigated. The experimental results showed that under the citrate hydrogen peroxide system, when the temperature was 90 °C, the rotation speed was 600 r·min(-1) and the solid-liquid ratio was 10 g·1 L(-1), the leaching rate of Co and Li could reach 86.21% and 96.9%, respectively. Under the tartaric acid system, the leaching rates of Co and Li were 90.34% and 92.47%, respectively, under the previous operating conditions. The adsorption results of the lithium-ion screen showed that the adsorbents were highly selective for Li(+), and the maximum adsorption capacities were 38.05 mg·g(-1). In the process of lithium removal, the dissolution rate of lithium was about 91%, and the results of multiple cycles showed that the stability of the adsorbent was high. The recovery results showed that the purity of LiCl, Li(2)CO(3) and CoCl(2) crystals could reach 93%, 99.59% and 87.9%, respectively. LiCoO(2) was regenerated by the sol-gel method. XRD results showed that the regenerated LiCoO(2) had the advantages of higher crystallinity and less impurity.